Surface Water Management Plan

Transcription

1 Surface Water Management Plan Prepared for the City of Apple Valley October 2018

2 Surface Water Management Plan Prepared for the City of Apple Valley October 2018 Barr Engineering Co.

3 Surface Water Management Plan October 2018 Contents Executive Summary... ES Introduction Location and History Purpose and Scope Water Resource Agreements SWMP Update, Amendment, and Reporting Land and Water Resource Inventory Climate and Precipitation Storm Event Precipitation Precipitation Variability and Trends Topography and Drainage Drainage Divides Soils Geology and Groundwater Bedrock Aquifers Surficial Aquifers Wellhead Protection Areas Land Cover and Land Use Lakes MDNR Public Waters MPCA Lake Classifications and Impaired Waters MPCA Impaired Waters Apple Valley Priority Lake Classification Apple Valley Priority Lakes Alimagnet Lake Cobblestone Lake Farquar Lake Keller Lake Lac Lavon Long Lake Wetlands Natural Communities and Rare Features Pollutant Sources Assessment of Issues and Opportunities Water Quality P:\Mpls\23 MN\19\ City of Apple Valley SWMP\WorkFiles\Plan\Final\AV_SWMP_v3_ docx i

4 National Pollutant Discharge Elimination System (NPDES) Impaired Waters and Total Maximum Daily Load (TMDL) Issues Alimagnet Lake TMDL Long Lake and Farquar Lake Keller Lake TMDL East Lake TMDL Chlorides Metropolitan Council Issues Specific Water Quality Issues and Opportunities Stormwater Pond Management Stormwater System Maintenance Programming Private Stormwater Facility Maintenance Water Quantity and Flood Risk Floodplain Management and Flood Insurance Studies Intercommunity Drainage and Flow Rates Specific Water Quantity Issues Wetlands Wetland and Shoreland Buffers City Wetland Classification and Management Aquatic Invasive Species (AIS) Groundwater Wellhead Protection Erosion and Sediment Control Opportunities Watershed Management Organization Cooperative Efforts and Funding Partnership with Neighboring Cities Redevelopment Opportunities Low Impact Development Practices Coordination with Other City Programs Stormwater System Analysis Mapping and Data Hydrologic Watershed Modeling Hydrologic Modeling Technical Background Hydrologic Watershed Modeling Results Summary Water Quality Modeling Water Quality Technical Background Water Quality Model Inputs Water Quality Model Results Goals and Policies Goals Policies ii

5 5.2.1 Flooding, water quantity, and rate control policies Surface water quality policies Stormwater management policies Wetland and buffer policies Groundwater management policies Development and redevelopment policies Education and public outreach policies Implementation Program NPDES MS4 Permit Stormwater System Operation and Maintenance Private Stormwater Facilities Inspection and Maintenance of Structural Pollution Control Devices Maintenance of Ponding Facilities Street Sweeping Adequacy of maintenance program Watershed Management Organization Roles and Responsibilities Black Dog Watershed Management Organization Vermillion River Watershed Joint Powers Organization Education and Public Involvement Program City Staff Residents Development Community Funding Considerations Stormwater Utility Fee Area Connection Charges Special Assessments (Minnesota Statutes 429) Grants and Cost-share Opportunities Water Quality Cash Dedication Ordinances, Design Standards, and Official Controls Capital Improvements and Implementation Priorities References iii

6 List of Tables Table 2-1 Selected Rainfall and Snowmelt Runoff Events Table 2-2 MPCA Eutrophication Water Quality Standards for Apple Valley Waterbodies Table 2-3 Summary of Impaired Waters within the City of Apple Valley Table 2-4 Summary of Apple Valley Priority Lake Characteristics Table 3-1 Pollutants Commonly Found in Stormwater Runoff Table 4-1 Modeled Areas Table 4-2 Initial and Final Infiltration Rates Table 4-3 Hydrologic Soil Groups for Urban Soil Series Table 4-4 Directly Connected Impervious Surface Table 4-5 City storm basins not included in P8 models Table 4-6 Areas modeled in P Table 4-7 Hydrologic Soil Group Type and TR-55 curve number Table Year Implementation Program Capital Improvements Table 6-2 Implementation Program Programs, Studies, and Official Controls List of Figures Figure 2-1 Topography Figure 2-2 Drainage Districts Figure 2-3 Hydrologic Soil Groups Figure 2-4 Wellhead Protection Areas Figure 2-5 Minnesota Land Cover Classification System Data Figure 2-6 Land Use (2010) Figure 2-7 Land Use (2040) Figure 2-8 MDNR Public Waters Figure 2-9 MPCA Impaired Waters Figure 2-10 Wetland Inventory and Management Classifications Figure 2-11 MPCA Potential Pollutant Sources Figure 4-1 Stormwater Drainage System Figure 4-2 Stormwater Drainage Areas List of Appendices, Attachments, or Exhibits Appendix A Appendix B Appendix C Appendix D Appendix E Appendix F City of Apple Valley Storm Water Pollution Prevention Program Wetland Information Hydrologic and Hydraulic Modeling Results Water Quality Modeling Results Stormwater Pond Design Standards Water Quality Cash Dedication Methodology iv

7 Certifications I hereby certify that this plan, specification, or report was prepared by me or under my direct supervision and that I am a duly Licensed Professional Engineer in the under the Laws of the State of Minnesota. Sterling G. Williams, Jr. PE #: October 25, 2018 Date v

8 Acronyms Acronym AIS BDWMO BMP BWSR CAMP CWA DEM DWSMA EDA EPA FEMA FIRM FIS HSG LA LGU LID LiDAR MCM MDNR MDH MGS MIDS MnDOT MnRAM MPCA MRCC MS4 MSP NFIP NOAA NPDES NRCS NWI OHWL P8 PWI SCS Description Aquatic Invasive Species Black Dog Watershed Management Organization Best Management Practice Minnesota Board of Water and Soil Resources Citizen Assisted Monitoring Program Clean Water Act Digital Elevation Model Drinking Water Supply Management Area Environmental Data Access (MPCA) Environmental Protection Agency Federal Emergency Management Agency Flood Insurance Rate Map Flood Insurance Study Hydrologic Soil Group Load Allocation Local Governmental Unit Low Impact Development Light Detection and Ranging Minimum Control Measure Minnesota Department of Natural Resources Minnesota Department of Health Minnesota Geological Survey Minimal Impact Design Standards Minnesota Department of Transportation Minnesota Routine Assessment Method Minnesota Pollution Control Agency Midwestern Regional Climate Center Municipal Separate Storm Sewer System Minneapolis/St. Paul International Airport National Flood Insurance Program National Oceanic and Atmospheric Administration National Pollutant Discharge Elimination System Natural Resource Conservation Service National Wetland Inventory Ordinary High Water Level Program for Predicting Polluting Particle Passage through Pits, Puddles and Ponds Public Waters Inventory Soil Conservation Service vi

9 SSTS SSURGO SWCD SWPPP TMDL TP TSS USDA USFWS VIC VRWJPO WCA WHEP WHPP WLA WMO WNRMP WRAPS WWTP Subsurface Sewage Treatment Systems Soil Survey Geographic Dataset Soil and Water Conservation District Storm Water Pollution Prevention Program Total Maximum Daily Load Total Phosphorus Total Suspended Solids United States Department of Agriculture United States Fish and Wildlife Service Voluntary Investigation and Cleanup Vermillion River Watershed Joint Powers Organization Wetland Conservation Act Wetland Health Evaluation Program Wellhead Protection Plan Waste Load Allocation Watershed Management Organization Water and Natural Resources Management Plan Watershed Restoration and Protection Strategy Wastewater Treatment Plant vii

10 Executive Summary The City of Apple Valley Surface Water Management Plan (SWMP or Plan) sets the course for the City s management of stormwater and water resources within the city. The SWMP provides data and other background information on resources, assesses city-wide and specific issues, sets goals and policies for the City and its resources, and lays out an implementation program to achieve the City s goals. The SWMP is organized into six major sections, summarized as follows: Section 1 Introduction Section 1.0 of the SWMP summarizes the City of Apple Valley s location and history and describes the purpose of the SWMP. The City s SWMP is the third iteration of the City s SWMP and replaces the previous SWMP adopted by the City in The purpose of the SWMP is to provide a framework and reference for protecting, preserving, and managing the City s surface water resources and stormwater management system. The purpose of this SWMP also includes those purposes given in Minnesota Statute 103B.201 for metropolitan water management programs, which include: Protect, preserve, and use natural surface and groundwater storage and retention systems; Minimize public capital expenditures needed to correct flooding and water quality problems; Identify and plan for means to effectively protect and improve surface and groundwater quality; Establish more uniform local policies and official controls for surface and groundwater management; Prevent erosion of soil into surface water systems; Promote groundwater recharge; Protect and enhance fish and wildlife habitat and water recreational facilities; and Secure the other benefits associated with proper management of surface and ground water. This SWMP was developed consistent with the requirements of Minnesota Statutes 103B.235, Minnesota Rules Chapter 8410, and consistent with the guidance from the Metropolitan Council, the Vermillion River Watershed Joint Powers Organization (VRWJPO), and the Black Dog Watershed Management Organization (BDWMO). Section 2 Land and Water Resource Inventory Section 2.0 of this Plan contains information about the physical resources in the city that affect, or are affected by, the City s stormwater and surface water management activities. Information presented in Section 2.0 address the following areas: Climate and precipitation Topography and drainage Soils Geology and groundwater Land cover and land use Lakes ES-1

11 Wetlands Natural communities and rate features Potential pollutant sources Information included in the land and water resources inventory is presented as text, tables, and figures. A key update to the land and water resources inventory include the 2013 publication of updated data on extreme precipitation events commonly used in the design of flood control systems. Other changes include revisions to hydrologic soil group delineations, updated land use data, and changes to the MPCA s impaired waters list. Section 3 Assessment of Issues and Opportunities This section of the SWMP presents and discusses the issues and opportunities facing the City, organized by various topics. The issues discussed in Section 3.0 are organized into the following topic areas: Water quality (including stormwater runoff water quality, MPCA impaired waters, total maximum daily load studies, waterbody classification and water quality goals, water quality BMP maintenance, and other water quality issues) Much of the City s storm drainage planning efforts were made during a time when flood protection was a top priority and the impacts of stormwater runoff on water quality were not fully recognized. Much of the existing water quality degradation is directly related to a largely irreversible stormwater system configuration that routes runoff from urbanized areas through the City s natural water resources. Some of the most challenging issues facing the City include the management of stormwater quality and the water quality of downstream water resources. Water quantity and flood risk reduction (including floodplain management, hydrologic and hydraulic modeling, and discussion of select local flooding issues) Many of the most significant historical flooding issues have been addressed by the City. However, development, redevelopment, and changing precipitation patterns place increasing stress on aging stormwater infrastructure. The hydrologic and hydraulic modeling included in the SWMP identified areas where the City will focus its flood risk reduction efforts. Wetland management (including wetland and shoreland buffers, aquatic invasive species, and wetland classification and inventory) Diverse wetland systems are critical components of a healthy hydrologic system. Tools to inventory, assess, and regulate wetlands are needed to minimize the negative effects of land development and other human activities in wetlands. Groundwater management Consumptive use of groundwater places increased pressure on the bedrock aquifers that the City relies upon for drinking water. In addition, development results in larger impervious areas and more compacted soils, decreasing opportunities for infiltration and recharge. Erosion and sediment control Increased sedimentation resulting from urban development may negatively impact water quality, fish and wildlife habitat, and aesthetics. Sediment deposition can also wholly or partially block culverts, manholes, and other stormwater facilities, increasing flood risk and requiring more frequent maintenance of the City s stormwater system. ES-2

12 Specific areas of the city that have been identified as having higher risk of water quality and water quantity issues through modeling ( hot spots ) are noted in Section 4.0 of the SWMP. Section 3.0 of the SWMP also describes opportunities for the City to address these issues. These opportunities, generally, include: Cooperation with watershed management organizations (and/or state agencies) Partnerships with neighboring cities Coordination of stormwater management improvements with redevelopment Implementation of low impact development (LID) practices Coordination of stormwater management improvements with other City programs (e.g., pavement management, park improvements) Section 4 Stormwater System Analysis Concurrent with the development of this SWMP, the City performed water quality modeling and hydrologic and hydraulic modeling for areas of the city not previously modeled. The water quality modeling estimates pollutant loading from subwatershed areas and water quality treatment achieved by downstream best management practices (BMPs). The hydrologic and hydraulic modeling estimates high water levels and inundation extents resulting from critical storm events. The City will use the modeling results to identify, prioritize, and address areas of potential water quality and water quantity issues. Modeling methodologies are described in Section 4.0 of the SWMP. Modeling results are presented in the appendices to the SWMP. Section 5 Goals, Strategies, and Policies The City developed a number of goals and policies to proactively manage its stormwater and surface water resources. The goals and policies are designed to continue to improve the quality and effectiveness of water resource planning and management in the city. These goals and policies have been developed to complement county, regional, and state goals, policies and management activities while minimizing redundancy. The City established the following goals related to stormwater and surface water management: 1. Manage the risk of flooding to minimize adverse effects to life, property, and infrastructure. 2. Manage surface water resources to promote healthy ecosystems, preserve water quality, and meet applicable water quality standards. 3. Manage stormwater runoff to reduce negative impacts to water resources and infrastructure. 4. Protect, restore, and enhance wetlands and natural areas. 5. Protect the quality and quantity of groundwater. 6. Protect water and natural resources through responsible management of development and redevelopment activities. 7. Promote stewardship of water and environmental resources through education, public involvement, and Cooperation. The policies intended to support these goals are included in their entirety in Section 5.0 of the SWMP. ES-3

13 Section 6 Implementation Program The purpose of the SWMP is to provide a framework and reference for protecting, preserving, and managing the City surface water resources and stormwater management system. An effective implementation program is critical to ensure that the direction provided in the SWMP yields results. Section 6.0 of the SWMP summarize key elements of the City s surface water and stormwater implementation program, including: NPDES and TMDL requirements Stormwater system operation and maintenance Education and public involvement Ordinances and official controls Lake management program Projects and capital improvements The implementation program is presented in Table 6-1 and Table 6-2 organized as follows: Table Year Implementation Program Capital Improvements Table 6-2 Implementation Program Programs, Studies, and Official Controls Many of the City s stormwater and surface water management activities are tied to the implementation of the City s Storm Water Pollution Prevention Program (SWPPP); the City s SWPPP is included as an appendix to this SWMP. Section 6.0 also describes the roles of the Black Dog Watershed Management Organization and the Vermillion River Watershed Joint Powers Organization with respect to water resource management within the city and activities performed in cooperation with the City. Section 7 References This section lists the documents and other references used in the preparation of the SWMP. ES-4

14 1.0 Introduction 1.1 Location and History The City of Apple Valley is located in the southeastern portion of the Twin Cities Metropolitan Area in north-central Dakota County. Apple Valley is bounded on the north by the City of Eagan, on the north and west by the City of Burnsville, on the east by the City of Rosemount, and on the south by the City of Lakeville. The City lies within two major watersheds, the Black Dog watershed (tributary to the Minnesota River) and the Vermillion River watershed (tributary to the Mississippi River). These watersheds are managed respectively by the Black Dog Watershed Management Organization (BDWMO) and the Vermillion River Watershed Joint Powers Organization (VRWJPO). These watershed management organizations (WMOs) and their coordination with the City are described in greater detail in Section 6.3. The northwest and southwest corners of the city are located within the jurisdiction of the BDWMO, with the remainder of the city within the jurisdiction of the VRWJPO. These watersheds cross political boundaries; therefore, cooperation between communities within the watershed is necessary to effectively manage the resources within each watershed. The City of Apple Valley began in the mid-1800s as a community known as Lebanon Township, formed in The area remained a lightly populated farming community until the 1950s when residential developments began to appear. In 1968, residents voted to incorporate Lebanon Township as the Village of Apple Valley. Apple Valley became a statutory city in Apple Valley has experienced steady population growth from a population of about 8,500 in 1970 to about 51,000 as of Continued growth is expected, with a population of 63,300 anticipated by the year Apple Valley encompasses approximately 17.5 square miles or about 11,200 acres. The City is nearly fully developed, with approximately 500 acres of vacant land remaining. These areas are located mostly in its southeast and south-central areas. Low density residential land use is the predominant land use, occupying nearly half the city (see Section 2.5). Significant park and recreation areas exist throughout the city, as well as commercial, industrial, and institutional development present mostly in the southern portion of the city. 1.2 Purpose and Scope This surface water management plan (SWMP) provides the City of Apple Valley with a comprehensive guide to managing water resources throughout the city. This SWMP replaces the 2008 Apple Valley Surface Water Management Plan (2008 SWMP). Several changes have occurred since the 2008 SWMP that are addressed by this update, including, but not limited to: Changes in current and anticipated future land use Modifications to the City s storm water system 1-1

15 Publication of updated precipitation frequency data (Atlas 14) Updates to the BDWMO and VRWJPO watershed management plans Updates to the Minnesota Pollution Control Agency s (MPCA) Municipal Separate Storm Sewer System (MS4) general permit Evolving public and government attitudes, perceptions, and awareness regarding surface water quality management Completion of several Total Maximum Daily Load (TMDL) studies for waters located within the city or outside of the city that receive drainage from the city (e.g., East Lake). The SWMP is a local water management plan prepared in accordance with Minnesota Statute 103B.235 and Minnesota Rules The purpose of this SWMP includes those purposes given in Minnesota Statute 103B.201 for metropolitan water management programs. According to statute, the purposes of these water management programs are to: Protect, preserve, and use natural surface and groundwater storage and retention systems; Minimize public capital expenditures needed to correct flooding and water quality problems; Identify and plan for means to effectively protect and improve surface and groundwater quality; Establish more uniform local policies and official controls for surface and groundwater management; Prevent erosion of soil into surface water systems; Promote groundwater recharge; Protect and enhance fish and wildlife habitat and water recreational facilities; and Secure the other benefits associated with proper management of surface and ground water. The scope of the SWMP is broad and addresses numerous issues including water quality, flood risk reduction, wetland management, development and redevelopment standards, public education, and others. The SWMP has been developed consistent the requirements of Minnesota Statutes 103B.235, Minnesota Rules Chapter 8410, guidance from the Metropolitan Council, and the watershed management organizations (WMOs) with jurisdiction in the city including the BDWMO and the VRWJPO. 1.3 Water Resource Agreements The City of Apple Valley has entered into the following water resource management related agreements: 1. Joint Powers Agreement establishing the Black Dog Watershed Management Organization (BDWMO). The original joint powers agreement between the member cities (including Apple Valley) went into effect in A revised joint powers agreement was developed and signed in The Minnesota Zoo has an agreement with the City regarding the discharge of water from landlocked ponds located on Zoo property during wet periods. The Zoo must first obtain permission from the City and demonstrate the water has met specified standards. The City ensures downstream capacity is available. 1-2

16 3. A Joint Powers Agreement with the City of Burnsville for in-lake projects on Alimagnet Lake, Lac Lavon, and Keller Lake. This JPA will allow more efficient management of these lakes by sharing project costs and staff labor between the two cities. Projects covered under the agreement are lake monitoring, aquatic plant surveys, fish management and invasive aquatic plant management. 4. A Joint Powers Agreement between the City of Apple Valley and the City of Burnsville related to the Alimagnet Lake lift station to control lake level from stormwater runoff (December, 1978). 1.4 SWMP Update, Amendment, and Reporting The SWMP is intended to guide the City s water resource management activities through the year 2028, or until superseded by adoption and approval of a subsequent SWMP. The City will begin the process of updating this plan one to two years before its expiration date in coordination with the City s comprehensive planning process. The updated plan will meet the requirements of the applicable Minnesota laws and rules, the BDWMO, and the VRWJPO. The City may revise the SWMP through an amendment prior to the scheduled SWMP update, if either minor changes are required, or if problems arise that are not addressed in the SWMP. However, this SWMP remains in full force and effect until an updated SWMP is approved by the VRWJPO and BDWMO and adopted by the City. Any significant changes to this SWMP must be approved by the affected WMO(s). Minor changes to this SWMP will not require WMO approval and can be made by City staff and supplied to the WMOs for their information. The City considers minor changes to be those that do not modify the goals, policies, standards, or commitments identified in the SWMP. Examples of minor changes include: Inclusion of updated hydrologic modeling results and mapping, as long as the changes do not significantly affect the rate or quality of intercommunity stormwater runoff. Inclusion of new/updated water quality monitoring data. Minor changes to the City s implementation program, such as added projects, schedule changes, and revised cost estimates, as long as there are no intercommunity impacts of such changes and the changes are consistent the goals and policies in the SWMP. If it is unclear whether a proposed SWMP change is minor or not, the City will bring the issue to the WMOs for their determination. The amendment procedure for the SWMP is presented below: Request for Amendment If the amendment is not proposed by City staff, a written request for plan amendment must be submitted to City staff. The request shall outline the need for the amendment and additional materials City staff will need to consider before making its decision. Staff Review of Amendment City staff will make a decision as to the validity of the request and either: o Reject the amendment o Accept the amendment as a minor issue, with minor issues collectively added to the plan at a later date, or 1-3

17 o Accept the amendment as a major issue, with major issues requiring an immediate amendment. In acting on an amendment request, City staff shall recommend to City Council whether or not a public hearing is warranted. Council Consideration The amendment and the need for a public hearing shall be considered at a regular or special Council meeting. Staff recommendations should be considered before decisions on appropriate action(s) are made. Public Hearing and Council This step allows for public input based on public interest. Council shall determine when the public hearing should occur in the process. Based on the public hearing, the City Council could approve the amendment. Watershed Organization Review and Approval The City shall submit the proposed amendment to the affected WMOs. The City shall also submit the proposed SWMP amendment to the Metropolitan Council and Dakota County. The review process for a SWMP amendment is the same as for the original SWMP the WMOs have 60 days to review and comment on the proposed SWMP amendment. Council Adoption Following approval by the watershed organizations, the City Council may adopt the amended SWMP. Prior to the adoption, an additional public hearing may be held to review the plan changes and notify the appropriate stakeholders. 1-4

18 2.1 Climate and Precipitation 2.0 Land and Water Resource Inventory The climate of Apple Valley is a humid continental climate, characterized by moderate precipitation, wide daily temperature variations, large seasonal variations in temperature, warm humid summers, and cold winters with moderate snowfall. The mean annual temperature is 46 F, as measured at the Minneapolis/ St. Paul (MSP) airport station ( ). Mean monthly temperatures vary from 16 F in January to 74 F in July ( ). Based on data from the NOAA National Climatic Data Center (NCDC) for the climate normal period, the average date for latest occurrence of freezing temperatures was April 26, while the average date for the first autumn frost was October 7. The average frost-free period (growing season) is approximately 160 days. Average total annual precipitation at the MSP airport station is 30.6 inches ( ). Mean monthly precipitation varies from 4.3 inches in August to 0.9 inches in January ( ). From May to September, the growing season months, the average rainfall is 19.0 inches or about 62 percent of the average annual precipitation ( ). Average annual lake evaporation is about 31 inches. Average annual snowfall at the MSP airport station is 54.4 inches ( ) Storm Event Precipitation Average weather imposes little strain on the typical drainage system. Extremes of precipitation and snowmelt are important for design of stormwater management and flood risk reduction systems. NOAA has data on extreme precipitation events that can be used to aid in the design of stormwater management and flood risk reduction systems. Extremes of snowmelt most often affect major rivers, the design of large stormwater storage areas, and landlocked basins, while extremes of precipitation most often affect the design of conveyance facilities. In contrast with stormwater drainage facilities, stormwater quality treatment systems are designed based on the smaller, more frequent storms which typically account for the majority of pollutant loadings from urban watersheds. NOAA published Atlas 14, Volume 8, in Atlas 14 is the primary source of information regarding rainfall in the region. Atlas 14 supersedes publications TP-40 and TP-49 issued by the National Weather Bureau (now the National Weather Service) in 1961 and Improvements in Atlas 14 precipitation estimates include denser data networks, longer (and more recent) periods of record, application of regional frequency analysis, and new techniques in spatial interpolation and mapping. Generally, precipitation depths reported in Atlas 14 are increased relative to TP-40 and TP-49. Runoff from spring snowmelt is significant in this region but is not provided in Atlas 14. The Soil Conservation Service s (now the Natural Resources Conservation Service) National Engineering Handbook, Hydrology, Section 4, presents maps of regional runoff volume. Table 2-1 lists selected precipitation and runoff events used for design purposes. 2-1

19 Table 2-1 Selected Rainfall and Snowmelt Runoff Events Type Event Frequency Duration Depth (inches) 2-year 24 hour year 24 hour year 24 hour 4.16 Rainfall 25-year 24 hour year 24 hour year 24 hour year 10 day year 10 day year 10 day 4.7 Snowmelt 1 25-year 10 day year 10 day year 10 day 7.1 Source: NOAA Atlas 14 Volume 8. Station: Farmington, MN ( ). Hydrology Guide for Minnesota (USDA Soil Conservation Service NRCS) (1) Snowmelt depth reported as liquid water Precipitation Variability and Trends It is important to note that the frequency (also called recurrence interval or return period) of a given storm event is a function of probability. The recurrence interval or return period describes the average time between events of a given magnitude expected over extremely long periods of time. The inverse of the recurrence interval is the probability of a given event occurring in any single year (e.g., a 100 year event has a 1% chance of occurring in any single year). The return period implies nothing about the actual time sequence of the event. For example, two 100 year events could occur in consecutive years, or even within a single year. Even with wide variations in climate conditions, climatologists have found four significant climate trends in the Upper Midwest (NOAA, 2013): Warmer winters Higher minimum temperatures Higher dew points Changes in precipitation trends more rainfall is coming from heavy thunderstorm events and increased snowfall 2-2

20 According to NOAA s 2013 assessment of climate trends for the Midwest (NOAA, 2013), annual and summer precipitation amounts in the Midwest are trending upward, as is the frequency of high intensity storms. Higher intensity precipitation events typically produce more runoff than lower intensity events with similar total precipitation amounts; higher rainfall intensities are more likely to overwhelm the capacity of the land surface to infiltrate and attenuate runoff. Precipitation records in the Twin Cities area show that the average annual precipitation has increased (Minnesota Climatology Working Group, 2016). Additional climate information can be obtained from a number of sources, such as the following: For climate information about the Twin Cities metropolitan area: Local data available from the Midwestern Regional Climate Center (MRCC): For a wide range of Minnesota climate information: Topography and Drainage Apple Valley has two distinct types of topography, including rugged terrain characterized by steep slopes, hills, and depressions in the north contrasted with flatter topography and gently sloping lands in the south (see Figure 2-1). The many depressions and natural ponds present in the north part of the city are ideal for long term storage of stormwater runoff. In the flatter, southern portion of the city the gently sloping land drains into several draws that eventually reach the Vermillion River. The urbanization of the city over time has greatly altered the natural topography of the watershed. With these alterations, drainage patterns have become more defined. Land surface elevations vary from a high of about 1,130 feet MSL in the northwest area of the city to a low of 900 feet MSL near Farquar Lake in the northeast. For general purposes, the City of Apple Valley currently uses 2-foot elevation contour information based on LiDAR data collected by the MDNR in Drainage Divides A major drainage divide separating the Minnesota River and the Mississippi River watersheds passes through Apple Valley. This divide generally runs from just north of Lake Alimagnet through the Palomino Hills area and then extends east to Rosemount. Most of the city drains south through Lakeville and Farmington to the Vermillion River which discharges into the Mississippi River near Hastings. A small amount of drainage from Apple Valley passes to the north through Eagan and west through Burnsville to the Minnesota River. For surface water management purposes, the City of Apple Valley is divided into seven minor watersheds (Districts) across the two major watersheds. These include: Mississippi River Watershed East Vermillion District Minnesota River Watershed Black Dog District 2-3

21 West Vermillion District Alimagnet Lake Northern Non-Contributing Areas Lac Lavon District Keller Lake District The drainage districts within the City of Apple Valley are shown in Figure 2-2. The area within the northern non-contributing area is generally landlocked, although the Wheaton Pond lift station can be used to pump water from Wheaton Pond to the East Vermillion River watershed The drainage districts within the Mississippi River watershed and Minnesota River watershed are located within and subject to the jurisdictions of the Vermillion River Watershed Joint Powers Organization (VRWJPO) and Black Dog Watershed Management Organization (BDWMO), respectively. The drainage districts in the city have been subdivided into smaller subwatersheds for the purposes of hydrologic, hydraulic, and water quality modeling (see Section 4.0 and Figure 4-2). 2.3 Soils Soil composition, slope, and land management practices impact water resource management by influencing the rate and volume of stormwater runoff as well as permeability, infiltration rate, and erodibility (i.e., potential for erosion). Infiltration capacities of soils affect the amount of direct runoff resulting from rainfall. Higher infiltration rates result in lower potential for runoff from the land, as more precipitation is able to enter the soil. Conversely, soils with low infiltration rates produce high runoff volumes and high peak discharge rates, as most or all of the rainfall moves as overland flow (runoff). The Natural Resources Conservation Service (NRCS formerly the Soil Conservation Service) has established four general hydrologic soil groups. These groups are: Group A Low runoff potential high infiltration rate Group B Moderate infiltration rate Group C Slow infiltration rate Group D High runoff potential very slow infiltration rate Combined with land use, the hydrologic soil grouping symbols (A through D) may be used to estimate the amount of runoff that will occur over a given area for a particular rainfall amount. As land is developed for urban use, much of the soil is covered with impervious surfaces, and soils in the remaining areas are significantly disturbed and altered. Development often results in compaction and tends to reduce infiltration capacity of otherwise permeable soils, resulting in significantly greater amounts of runoff. Figure 2-3 presents the most current hydrologic soil group data for the City of Apple Valley; the data are based on the Soil Survey Geographic dataset (SSURGO) from the NRCS. Because of urban development and land use, some areas of the city have undefined hydrologic soil groups. Most of the city for which hydrologic soil groups have been defined are classified as type B soils with moderate to high infiltration and low to moderate runoff potential. Soils classified as hydrologic soil group C are generally located in the northern part of the city. Figure 2-3 is intended to provide general guidance about the infiltration 2-4

22 capacity of the soils throughout the city. However, soils should be inspected on a site-by-site basis as projects are considered. Detailed information about soil types and distributions within the city is available from the Soil Survey of Dakota County, Minnesota (NRCS, 2016, as amended). The NRCS soil survey identifies soils in the northern and western part of Apple Valley from the Kingsley-Mahtomedi association; these soils are characterized as gently sloping to very steep, loamy and silty textured soils. Soils from the Waukegan-Wadena-Hawick association occur more commonly in the southern part of the city. These soils range from level to very steep and include silty, loamy and sandy textures. The most recent information from the NRCS soil survey is available online at: Geology and Groundwater The City of Apple Valley is located in the southwestern portion of a bowl-like bedrock structure underlying the Minneapolis-St. Paul metropolitan area (called the Twin Cities basin), which has a gentle slope to the southeast. The bedrock is overlain by a layer of glacial drift which varies from up to 300 feet thick in the western and northern parts of the city and to less than 50 feet in the southeastern part of the city. Generally, there is no uniform relationship between the existing surface topography and the bedrock structure. The bedrock underlying Apple Valley consists primarily of the St. Peter Sandstone formation and is intermixed with the Platteville and Glenwood formation. The surficial geology present near or at the land surface is a product of glaciation that occurred approximately 10,000 years ago and left areas of glacial moraines (the termination point of a glacial advance) and outwash plains (formed by melting glacier). Deposits from the superior lobe include moraines of glacial till characterized by reddish-brown sandy loam, cobbles, and boulders in the central and northern parts of the city, and outwash plains comprised of gravel and sand in the southern part of the city Bedrock Aquifers The region is underlain by six major bedrock aquifers: (1) Platteville Limestone, (2) St. Peter Sandstone, (3) Prairie du Chien-Jordan, (4) St. Lawrence-Franconia Dolomite, (5) Wonewoc Sandstone (formerly Ironton-Galesville Sandstones), and (6) Mt. Simon-Hinckley Sandstones. In addition, there are numerous aquifers in the glacial drift. The City of Apple Valley uses groundwater for its municipal water supplies. The City maintains 20 wells in the Prairie du Chien-Jordan and Mt. Simon-Hinckley aquifers, five of which are reserved for emergency use. Municipal wells range in depth from approximately 500 feet (Prairie du Chien-Jordan) to over 1,100 feet (Mt. Simon-Hinckley). In 2016, the City pumped approximately 2 billion gallons of groundwater from municipal wells Surficial Aquifers Surficial aquifers are water-bearing layers of sediment, usually sand and gravel, which lie close to the ground surface. Some private domestic wells remain in the city and draw water from these aquifers. Since 2-5

23 the surficial aquifers are more susceptible to pollution, they are generally not used for municipal or public supply wells. The depth of the water table varies across the watershed, but is on the order of tens of feet. Recharge to the surficial aquifers is primarily through the downward percolation of local precipitation. The ponds, lakes, and wetlands scattered throughout the city recharge the groundwater. Some of these waterbodies are landlocked and their only outlet is to the groundwater; some landlocked lakes may be perched above the regional level of the shallow groundwater in the watershed. Some surficial aquifers may also be recharged during periods of high stream stage. Surficial aquifers may discharge to local lakes, streams or to the underlying bedrock Wellhead Protection Areas The increased population in the Twin Cities metropolitan area has put increased pressure on groundwater quantity and quality. The Minnesota Department of Health (MDH) is responsible for the protection of groundwater quality and aims to prevent contaminants from entering the recharge zones of public water supply wells through its wellhead protection program. This includes the development of wellhead protection plans (WHPPs) and guidance to limit potential for groundwater contamination (see Section 3.4.1). Wellhead protection efforts may restrict or prevent the use of certain stormwater BMPs within these areas to prevent possibly contaminated stormwater from reaching groundwater supplies. The City of Apple Valley maintains a WHPP consistent with MDH requirements. Figure 2-4 shows the delineated wellhead protection areas within the City of Apple Valley and relative aquifer vulnerability. 2.5 Land Cover and Land Use Land cover classification is a characterization of the features covering the ground surface, including natural and anthropogenic features (e.g., deciduous forest, impervious surface). In contrast, land use describes the activities that occur on a piece of land (e.g., residential or commercial use) and is typically regulated by municipal zoning codes. Identification and interpretation of land cover is standardized under the Minnesota Land Cover Classification System (MLCCS) implemented by the MDNR. The MLCCS is a vegetation oriented classification system designed to identify natural and cultural land cover. The MLCCS is intended to aid natural resource identification, protection and restoration efforts. The Dakota SWCD maintains the MLCCS database for this region. MLCCS data for the City of Apple Valley is shown in Figure 2-5. Land use classification and regulation is performed at the local level to govern development. Municipal planning and zoning activities define the allowed land use activities within designated areas of a city. Land use types have varying impacts on water and natural resources due primarily to the percentage of impervious area associated with the land use type (e.g., rooftop, parking lot) and the types of activity occurring at that land use type (e.g., industrial activity). Land use (as of 2010) within the City of Apple Valley is presented in Figure 2-6. Estimated future land use is presented in Figure

24 2.6 Lakes MDNR Public Waters The MDNR designates certain water resources as public waters to indicate those lakes, wetlands, and watercourses over which the MDNR has regulatory jurisdiction. By statute, the definition of public waters includes public waters, public waters wetlands, and public watercourses. The collection of public waters and public waters wetlands designated by the MDNR is generally referred to as the public waters inventory, or PWI. Public waters are all basins and watercourses that meet the criteria set forth in Minnesota Statutes, Section 103G.005, subd. 15 that are identified on public water inventory maps and lists authorized by Minnesota Statutes, Section 103G.201. Public waters wetlands include all Type 3, Type 4, and Type 5 wetlands, as defined in U.S. Fish and Wildlife Service Circular No. 39, 1971 edition that are 10 acres or more in size in unincorporated areas or 2.5 acres or more in size in incorporated areas (see Minnesota Statutes Section 103G.005, subd. 15a and 17b). A MDNR permit is required for work within designated public waters. The MDNR uses county-scale maps to show the general location of the public waters and public waters wetlands under its regulatory jurisdiction. These maps are commonly known as public waters inventory (PWI) maps. PWI maps also show public waters watercourses and public ditches. The regulatory boundary of these waters and wetlands is called the ordinary high water level (OHWL). The PWI maps and lists are available on the MDNR s website at: Figure 2-8 shows the waters, wetlands, and streams listed on the MDNR PWI located in the City of Apple Valley. There are several designated and numbered public waters lakes within the city, including the following named lakes: Alimagnet Lake (MDNR ID ) Farquar Lake (MDNR ID ) Keller Lake (MDNR ID ) Long Lake (MNDR ID ) MPCA Lake Classifications and Impaired Waters The federal Clean Water Act (CWA) requires states to adopt water quality standards to protect the nation s waters. To that end, the MPCA developed criteria for Minnesota lakes and streams to establish water quality goals and determine appropriate uses of the lakes and streams, as outlined in the guidance document Guidance Manual for Assessing the Quality of Minnesota Surface Waters for Determination of Impairment: 305(b) Report and 303(d) List (MPCA, 2016). As part of establishing water quality goals, the MPCA classifies lakes according to depth and ecoregion. The MPCA defines shallow lakes as those having a maximum depth of 15 feet or less or a littoral area (area of lake 15 feet deep or less) of 80 percent or more, while deep lakes include those lakes with a 2-7

25 maximum depth above 15 feet and a littoral area of less than 80 percent. Ecoregions are areas of relative uniformity characterized by distinctive regional ecological factors, including land use, soils, topography and potential natural vegetation (MPCA, 1997). Because these factors, combined with depth, affect the water quality that may be reasonably obtained in a specific lake, the MPCA eutrophication criteria for Minnesota lakes vary by ecoregion and depth of the lake. The City of Apple Valley is located within two MPCA ecoregions. The North Central Hardwood Forest (NCHF) ecoregion covers most of the city, while the Western Corn Belt Plains (WCBP) ecoregion covers approximately 20% of the city in the southeast portion. All of the MNDR public waters within the city are located within the NCHF ecoregion. Cobblestone Lake is the only Apple Valley priority lake located within the WCBP ecoregion. The delineation of ecoregions has varied over time. Water quality standards related to eutrophication (i.e., nutrient enrichment) of lakes and streams are of particular concern due to the presence of excess nutrients in stormwater runoff (see Section 3.1). MPCA eutrophication water quality standards applicable to deep and shallow lakes within the NCHF and WCBP ecoregions are summarized in Table 2-2. Table 2-2 MPCA Eutrophication Water Quality Standards for Apple Valley Waterbodies Waterbody MPCA Ecoregion Total Phosphorus (ug/l) Shallow Lakes Chlorophyll a (ug/l) Secchi Depth (m) Total Phosphorus (ug/l) Deep Lakes Chlorophyll a (ug/l) Secchi Depth (m) Alimagnet Lake NCHF Cobblestone Lake WCBP Farquar Lake 1 NCHF Keller Lake NCHF Lac Lavon NCHF Long Lake 1 NCHF Note: standards presented above are summer average values calculated from June through September. MN Rule includes water quality standards for additional parameters. (1) Farquar Lake and Long Lake are subject to WCBP ecoregion water quality standards based on the Long and Farquar Lakes Nutrient TMDL (MPCA, 2009). The MPCA also established water quality standards for parameters in addition to those presented in Table 2-2; these standards are published in Minnesota Rules 7050 and are applicable to lakes, ponds, and streams. Standards for several parameters included in Minnesota Rules 7050 vary according to the MPCAdetermined designated use of the waterbody (e.g., drinking water, industrial use) MPCA Impaired Waters In compliance with Section 303(d) of the CWA, the MPCA identifies and establishes priority rankings for waters that do not meet the water quality standards. The list of impaired waters, sometimes called the 2-8

26 303(d) list, is updated by the MPCA every 2 years. Several waterbodies within the City of Apple Valley have been listed on the MPCA impaired waters (303(d)) list for a variety of impairments (see Table 2-3 and Figure 2-9). Waterbodies on the impaired waters list are required to have an assessment completed that addresses the causes and sources of the impairment. This process is known as a total maximum daily load (TMDL) analysis. TMDLs applicable to Apple Valley waterbodies are described in greater detail in Section Table 2-3 Summary of Impaired Waters within the City of Apple Valley Waterbody Impaired Use Pollutant or Stressor Year Listed TMDL Study Approved Alimagnet Lake Aquatic Recreation Nutrients/Eutrophication Farquar Lake Aquatic Recreation Nutrients/Eutrophication Keller Lake Aquatic Recreation Nutrients/Eutrophication Long Lake Aquatic Recreation Nutrients/Eutrophication Lac Lavon Aquatic Consumption Mercury East Lake PWI (in Lakeville) Aquatic Recreation Nutrients/Eutrophication (1) addressed by the Vermillion River Watershed TMDL Report (MPCA, 2015); (2) addressed by the Long and Farquar Lakes Nutrient TMDL (MPCA, 2009); and the Long and Farquar Lakes TMDL Implementation Plan Update (EOR, 2017); (3) addressed by the Crystal, Keller, and Lee Lakes Nutrient Impairment and Total Maximum Daily Load Report and Earley Lake Water Quality Assessment (MPCA, 2011); (4) addressed by the Minnesota Statewide Mercury TMDL (MPCA, 2008) Apple Valley Priority Lake Classification The following section provides the basis for classification of priority lakes in Apple Valley to guide water quality management actions. There are six lakes wholly or partially located within the City of Apple Valley that are classified by the City as priority lakes, including: Alimagnet Lake Cobblestone Lake Farquar Lake Keller Lake Lac Lavon Long Lake 2-9

27 Table 2-4 summarizes the physical characteristics of priority lakes and their tributary watersheds. Table 2-4 Summary of Apple Valley Priority Lake Characteristics Waterbody MNDR Public Water ID Area (acres) Volume (acrefeet) Watershed Area 1 (acres) Direct Indirect Total Max Depth (ft) Mean Depth (ft) Alimagnet Lake Cobblestone Lake ,922 3, Farquar Lake ,821 1, Keller Lake , Lac Lavon Long Lake Notes: data based on 2007 SWMP. (1) Watershed area does not include landlocked sub-districts or surface area of water body in the column heading. The City identified the above lakes as priority lakes based on factors including: Coordination with classification systems by adjacent cities and/or WMOs Applicability of MPCA water quality standards Existing MPCA impairments and/or TMDL studies Intended recreational uses Keller Lake and Lac Lavon are classified as strategic waterbodies by the BDWMO. The City has adopted the following BDWMO strategic waterbody classifications: Keller Lake BDWMO Category III strategic waterbody Lac Lavon BDWMO Category I strategic waterbody The City adopts the water clarity action levels established for BDWMO strategic waterbodies (see Table 2-6 of the BDWMO Plan, as updated). These action levels vary based on historical water quality. As of the writing of this SWMP, there is no action level for Keller Lake (due to its Category III classification); the water clarity action level for Lac Lavon is <3.5m and water clarity. The City will continue to manage Keller Lake and Lac Lavon in a manner consistent with the BDWMO classifications. Similarly, the City will continue to manage Alimagnet Lake in a manner consistent with the City of Burnsville s classification and management framework applicable to the lake, including adoption of the following water clarity goal (see 2017 Burnsville local water management plan): Alimagnet Lake 1.0 m Secchi depth water clarity goal 2-10

28 The City identified specific strategies and actions to address water quality in priority lakes. These strategies and actions are included in the City s implementation program (see Section 6.0). The waterbodies within the city that are not classified as priority lakes will be managed as wetlands or as stormwater management ponds Apple Valley Priority Lakes Alimagnet Lake Alimagnet is a shallow lake with a maximum depth of 11 feet and a surface area of 109 acres. This lake is located on the border between Burnsville and Apple Valley in the northeast part of Dakota County. About one half of the shoreline is developed as single-family homes and the other half is Alimagnet Park, located in the southern end of the lake in Apple Valley and Burnsville. There is an Apple Valley owned fishing pier located on the south end of the lake Water quality of this lake is poor, with severe algae blooms. Dissolved Oxygen (DO) concentrations were monitored for an entire year in 1990 as part of an intensive study on the lake and its watershed. The collected data showed that Alimagnet Lake will weakly stratify during the summer, exacerbating poor water quality conditions. In the past, winter DO levels were depleted in some years producing a winterkill condition. A winter aeration system was installed in the east arm of Alimagnet Lake in November 1999, limiting the occurrence of winter fish kills. A lake management plan for Alimagnet Lake was completed in 2005 for the Cities of Apple Valley and Burnsville (Bluewater Science, et. al. 2005). A summary of that report is included as an appendix to the City s 2008 SWMP. The Vermillion River Watershed also completed a Subwatershed Assessment in Cobblestone Lake Cobblestone Lake is a created stormwater facility with a surface area of 37 acres and a maximum depth of 21 feet. The lake was developed from a former mining pit area. Cobblestone Lake is located in the East Vermillion River District and is situated in the southeastern portion of the city. The bathymetric survey conducted in 2006 shows some deviation from the 2000 proposed grading plan for Cobblestone Lake. Water levels in Cobblestone Lake are controlled by a lift station, which pumps outflow into the City of Lakeville s storm sewer system. However, the pump is rarely operated (except for standard maintenance) due to seepage losses to groundwater. The MDNR conducted a fish survey of Cobblestone Lake in 2015 and noted the presence of bluegill, crappie, sunfish, and bullhead. The MDNR stocks the lake with small walleye in odd years. A fishing pier owned by the City is located on the lake. Water quality conditions in Cobblestone Lake have been monitored annually since 2005 through the Metropolitan Council s Citizen Assisted Monitoring Program (CAMP). Collected data show an improvement (increase) in average summer lake transparency that is statistically significant from 2005 through Lake water quality parameters are generally within the eutrophic range, but meet 2-11

29 applicable MPCA water quality standards (see 2.6.2). Additional water quality data for Cobblestone Lake is available from the MPCA at: Results of the water quality modeling performed as part of this SWMP (see Section 4.3) estimate that the direct watershed contributes over 60% of the total phosphorus load to Cobblestone Lake. As such, a high priority has been placed on implementing watershed treatment BMPs, including infiltration, upstream of Cobblestone Lake. Outflow from Farquar Lake contributes about half of the surface water runoff flowing into Cobblestone Lake (during the one year, 24-hour storm event). Outflow from Farquar is routed through several stormwater treatment ponds before discharging into Cobblestone, providing some additional treatment. The City completed a lake management plan for Cobblestone Lake in Elements of that plan have been incorporated into the planned management activities for Cobblestone Lake Farquar Lake Farquar Lake is a shallow 67-acre lake with a maximum depth of 10 feet. There is a City park (Farquar Park) in the southwest corner of the lake. A fishing pier is present at the park but no public boat access. Water quality in Farquar Lake has been monitored annually since Water quality conditions for Farquar Lake have declined substantially since the mid-1990s. An MPCA trend analysis revealed a statistically significant decrease in water clarity from about 1995 through Since 2005, summer average water clarity has improved slightly, but the trend is not significant. Farquar Lake is identified as an impaired water body due to excess nutrients by the MPCA. Additional water quality data for Farquar Lake is available from the MPCA at: Black bullhead are the dominant fish species in Farquar Lake. The lake is limited to rough fish due to low dissolved oxygen conditions. This lake has a history of fish kills, first recorded in MDNR records indicate that excessive algae may have caused a dissolved oxygen deficit and resulted in the fish kill. Farquar Lake has a total watershed of almost 1,900 acres, of which about 1,100 acres first flows through Long Lake. Upstream water quality conditions in Long Lake may significantly contribute to Farquar Lake s overall annual pollutant load. Thus, actions taken to improve the Farquar Lake system must be considered in conjunction with actions in the Long Lake watershed. A joint TMDL for Long Lake and Farquar Lake was completed in 2009 (see Section ), and the Implementation Plan was updated in Keller Lake Keller is a shallow lake with a surface area of 52 acres and a maximum depth of about 8 feet. This lake is located in the southwestern portion of the city on the border between Burnsville and Apple Valley. Only a small portion of the eastern shoreline resides within Apple Valley, and just over 900 acres (about 60 percent) of the total drainage area to Keller Lake lies within the City of Apple Valley. The lake also receives emergency discharge from Lac Lavon through a 12-inch diameter pipe. The primary use of the lake is for fishing, canoeing, and wildlife viewing by local residents. The direct drainage is largely residential with park areas on the south side of the lake. The lake has no public beach or developed boat access. 2-12

30 Water quality conditions for Keller Lake have improved slightly since Metropolitan Council s Citizen Assisted Monitoring Program began monitoring the lake in 1996, but conditions remain poor overall within the lake. The BDWMO has also performed regular water quality monitoring of Keller Lake. The MPCA lists Keller Lake as impaired due to excess nutrients, and a TMDL that included Keller Lake was completed in 2011 (see Section ). A primary contributor to the impairment is the lack of stormwater treatment within the direct tributary watershed. Nearly the entire sub-watershed is developed, over half of which is low density residential. Additional water quality data for Keller Lake is available from the MPCA at: The lake is entirely classified as littoral and rooted, submerged vegetation covers most if not the entire lake bed most years. The lake has a low diversity of native aquatic plants in the submergent zone; invasive curlyleaf pondweed dominates this system, and Eurasian watermilfoil is also present. Native aquatic plants present include stringy pondweed, coontail, and elodea. Emergent vegetation demonstrates a much higher diversity of native species. Summertime die back of dense plant growth contributes to high internal loading rates. The BDWMO performs semi-regular aquatic plant surveys of Keller Lake as part of its habitat monitoring program, last performed in 2015 (Barr, 2016) Lac Lavon Lac Lavon is a deep lake with a surface area of 67 acres and a maximum depth of 32 feet. Lac Lavon was formed by gravel quarry work that extended into a groundwater source. This lake is within the Lac Lavon District and is situated on the boundary between Apple Valley and Burnsville. The lake has no active outlet and is therefore considered landlocked. A 12-inch diameter emergency overflow pipe exists, but is normally closed by a valve. Emergency outflows from Lac Lavon flow to Keller Lake. Lac Lavon currently has a carry in access and a fishing pier located in the northeast portion of the lake that is owned by the City. The lake is used for a variety of recreational purposes including swimming and fishing. Lac Lavon is considered a strategic water resource by the Black Dog Watershed Management Organization. Although Lac Lavon carries a MDNR water body identification number, it is not classified as a MDNR public water. Water quality of Lac Lavon is exceptional and shows no statistically significant trends over available monitoring period. Additional water quality data for Lac Lavon is available from the MPCA at: Being groundwater-fed has created conditions of high oxygen and low temperatures within the lake. The areas of high oxygen (over 5.0 ppm) and low temperatures (under 70 degrees Fahrenheit) within Lac Lavon makes it suitable for trout. The lake has been stocked with rainbow trout by the MDNR in the past. Eurasian watermilfoil is present in areas of the lake and may hinder some of the recreation within the lake. Curlyleaf pondweed is also present in the early part of the year. Moderate densities of brittle naiad, a nonnative, invasive plant species have been found in Lac Lavon during previous monitoring years (Barr, 2014). The BDWMO performs semi-regular aquatic plant surveys of Lac Lavon as part of its habitat monitoring program, last performed in A lake management plan for Lac Lavon was prepared in 2002 (Bluewater Science, 2002). One objective of managing the lake has been to control the Eurasian watermilfoil and 2-13

31 other invasive species without harming the important native aquatic plant community, which included 12 submergent species and 32 emergent species in a 2014 survey (Barr, 2015) Long Lake Long Lake is a shallow lake with a maximum depth of five feet, an estimated mean depth less than three feet, and a surface area of 34 acres. A complete bathymetric survey has not been performed for the lake. However, lake depth data was field collected by City staff at 19 points on the lake, thereby allowing an estimate of lake bathymetry. No developed water access exists for the lake but there is a public park located on the west end of the lake. The extremely shallow nature of the lake results in a 100% littoral area dominated by aquatic plants. The invasive curlyleaf pondweed is present in the lake. Water quality conditions for Long Lake are poor. The MPCA classified Long Lake as impaired due to excess nutrients. A major factor in the water quality management for Long Lake is the large ratio of watershed area to lake surface area (28:1). The large ratio indicates that Long Lake is vulnerable to stress from watershed inputs. Even with low pollutant source loads, the magnitude of the drainage area delivers nutrients at levels beyond the assimilative capacity of the lake. The high ration of watershed area to lake area results in a relatively short hydraulic residence time and the lake is flushed several times per year. As such, the lake quality will be strongly influenced by the quality of the incoming stormwater as well as inlake biological processes. A TMDL for Long Lake and Farquar Lake was completed in Discharge from Long Lake flows to Farquar Lake. Efforts to improve water quality in the Long Lake watershed may have further cumulative effects on Farquar Lake. Thus, the City generally considers management actions for both Long Lake and Farquar Lake collectively. 2.7 Wetlands Wetlands fill a number of roles in the landscape, including improving water quality, and providing floodwater retention. They are also a critical habitat component for many species of wildlife and often contribute significantly to the aesthetics of an area. While some wetland areas in the city were drained or filled as the city developed (prior to the establishment of regulations protecting wetlands), many wetlands remain. Presently, wetlands are protected by the Wetland Conservation Act (WCA, see Section 3.3); the City serves as the local government unit (LGU) responsible for administering the WCA. Nationally, the U.S. Fish and Wildlife Service (USFWS) is responsible for mapping wetlands across the country, including those in Apple Valley. The USFWS identifies and delineates wetlands, produces detailed maps on the characteristics and extent of wetlands, and maintains a national wetlands database as part of the National Wetland Inventory (NWI). The NWI is periodically updated based on available imagery. There are approximately 300 wetlands within the City of Apple Valley. Thirty (30) of these wetlands are located in the BDWMO with the remaining approximately 270 wetlands located in the VRWJPO. The City and/or Dakota SWCD has also inventoried, classified, and assessed all wetlands within the city. The City s wetland assessment determined the appropriate function and value for each wetland using an on-site evaluation methodology. Functions and values can include water quality treatment enhancement 2-14

32 potential, but also recreation potential and the potential for aesthetic and wildlife enhancements to the wetlands and buffer areas. The SWCD inventory methodology is slightly different than the City assessment, which may potentially result in different scoring of assessment factors. Generally, there is good agreement between the two assessments. Due to the use of on-site methods, however, the City assessment should be used for wetland management, when available. The City s inventory and assessment methodology is based on the Minnesota Routine Assessment Method (MnRAM) for evaluating wetlands and is described in greater detail in Appendix B. Wetlands in the city are classified according to the following management types (in order of decreasing protections, see also Appendix B): Protect Manage 1 Manage 1-Restore Manage 2 Manage 2-Restore Manage 3 Wetlands within the city are presented according to their management classification in Figure It is expected that the City and SWCD have inventoried and classified all wetlands within the city. However, there is the potential that some wetlands were missed during the assessment. Therefore, the City also requires a site-specific delineation of the wetland boundary as part of proposed development or redevelopment activities. The City established water quality and buffer standards for wetlands according to their management classifications. These standards are included in the City s wetland policies listed in Section The City further evaluated wetlands assigned to Manage 1-Restore or Manage 2-Restore classifications to determine wetland restoration or enhancement priorities (see Section 3.3). Wetlands were ranked as having exceptional, high, medium, or low restoration or enhancement potential based on the level of effort to correct hydrologic alteration, restore community types, and other factors. Specific wetland restoration or enhancement opportunities are listed according to drainage district in Section Natural Communities and Rare Features Prior to settlement, the City of Apple Valley was covered by three major natural communities. Prairie covered the southeast portion of the city. The far north part of the city was covered by upland deciduous forest including white and red oak, elm, and basswood species. Oak openings and barrens occupied the western part of the city as well as a narrow band between northern forests and southeast prairie. Natural vegetation in the city has been altered over time by agricultural development and urbanization. According to the map Natural Communities and Rare Species of Dakota County (Minnesota County Biological Survey, 1997), areas of natural communities remaining in the city are limited to oak woodland and brushland north of Palomino Drive at the far western edge of the city, and moderately wet oak forest along the south shore of Alimagnet Lake (including Alimagnet Park). 2-15

33 The MDNR maintains a database of rare plant and animal species and significant natural features, known as the Natural Heritage Information System (NHIS). The purpose of the database is to foster better understanding and conservation of these features. The database indicates that there are several notable natural features found within the city. These include plant species, plant communities as well as the Blandings and Wood Turtle, both of which are listed as threatened by the State of Minnesota. The specific locations of rare species are not publically available to promote conservation. Generally, these features are located in older developments of the city and are not threatened by anticipated future development. More information is available from the MDNR s NHIS website at: Pollutant Sources Potential sources of water pollution in the City of Apple Valley are many and varied. There are many permitted sites, hazardous waste generators, and contaminated sites within the city. The MPCA maintains a state-wide database of these sites, which includes permitted sites (air, industrial stormwater, construction stormwater, wastewater discharge), hazardous waste generating sites, leak sites, petroleum brownfields, tank sites, unpermitted dump sites, and sites enrolled in the Voluntary Investigation and Cleanup (VIC) program. This information is available online through the MPCA s What s In My Neighborhood program, and is presented in Figure The location of these potentially contaminated or hazardous waste sites should be considered as sites are redeveloped and BMPs are implemented. The presence of soil contamination at many of these sites, if not removed, may limit or prevent infiltration as a stormwater management option. In contrast to sites with known hazards, non-point source pollution cannot be traced to a single source or pipe. Instead, pollutants are carried from land to water in stormwater or snowmelt runoff, in seepage through the soil, and in atmospheric transport. Discharge from stormwater pipes is considered a nonpoint source discharge as the pollutants coming from the pipe are generated across the watershed contributing to the pipe, not at a single location. Point sources frequently discharge continuously throughout the year, while non-point sources discharge in response to precipitation or snowmelt events. For most waterbodies, non-point source runoff, especially stormwater runoff, is the major contributor of pollutants. Some areas within the city are served by subsurface sewage treatment systems (SSTS). Non-functioning SSTS may be a non-point source of pollutants. Improperly sited, installed or maintained systems may achieve inadequate treatment of sewage. In addition to the public health risks of untreated or inadequately treated sewage (e.g., contamination of wells), sewage contains the nutrient phosphorus, which if discharged into waterbodies can cause excessive algae and aquatic plant growth leading to degradation in water quality. The MPCA implements an SSTS regulatory program to manage the environmental and public health impacts of SSTS. More information about potential pollutant sources is available from the MPCA website:

34 Section 2 Figures Figure 2-1 Topography Figure 2-2 Drainage Districts Figure 2-3 Hydrologic Soil Groups Figure 2-4 Wellhead Protection Areas Figure 2-5 Minnesota Land Cover Classification System Data Figure 2-6 Land Use (2010) Figure 2-7 Land Use (2040) Figure 2-8 MDNR Public Waters Figure 2-9 MPCA Impaired Waters Figure 2-10 Wetland Inventory and Management Classifications Figure 2-11 MPCA Potential Pollutant Sources

35 3.0 Assessment of Issues and Opportunities This section of the Plan presents and discusses the issues and opportunities facing the City, organized by various topics. Issue identification was an important task in development of this Plan and allows the City to focus its water resource management actions over the next 10 years. Issue identification included review of Metropolitan Council and watershed management organization (WMO) planning documents, review of available studies, discussion with City staff, and public engagement performed concurrent with the City s Comprehensive Plan update. The identified issues are discussed in the following sections. Major opportunities for the City to consider in addressing these issues are summarized at the end of this section. 3.1 Water Quality Pollutants are discharged to surface waters as either point sources or nonpoint sources. Point source pollutants discharge to receiving surface waters at a specific point from a specific identifiable source (e.g., discharge from wastewater treatment plants). Unlike point sources, nonpoint source pollution cannot be traced to a single source or pipe. Instead, pollutants are carried from land to water in stormwater or snowmelt runoff, in seepage through the soil, and in atmospheric transport. All these forms of pollutant movement from land to water make up nonpoint source pollution. For most water bodies, nonpoint source runoff, especially stormwater runoff, is a major contributor of pollutants. Stormwater runoff includes pollutants such as nutrients (e.g., phosphorus), sediment, chlorides, oil, grease, chemicals (including hydrocarbons), metals, litter, and pathogens (e.g., E. coli and fecal coliform), all of which can severely reduce water quality. Table 3-1 summarizes the principal pollutants found in stormwater runoff, example sources of pollutants, and possible impacts of each. For lakes, ponds, and wetlands, phosphorous is typically the pollutant of major concern. Land disturbance (e.g., construction, redevelopment) and increased imperviousness increase the amount of phosphorus carried in stormwater runoff. Over time, increased phosphorus in runoff can accumulate in lake and pond sediments, contributing to internal loading under certain conditions. As phosphorus loadings increase, it is likely that water quality degradation will accelerate, resulting in unpleasant consequences, such as profuse algae growth or algal blooms. Algal blooms, overabundant aquatic plants, and the presence of nuisance/exotic species, such as Eurasian watermilfoil, purple loosestrife, and curlyleaf pondweed, interfere with ecological function as well as recreational and aesthetic uses of water bodies. Phosphorus loadings must often be reduced to control or reverse water quality degradation. Increased urbanization may also result in increased chloride loading from road de-icing practices. Chloride dissolves in stormwater runoff and is not easily removed by traditional stormwater quality best management practices (e.g., sedimentation ponds). Elevated chloride levels can negatively affect fishery populations and other aquatic life. Other pollutants of concern include polycyclic aromatic hydrocarbons (PAHs). PAHs are formed by the incomplete combustion of organic materials including wood, oil, and coal. These contaminants persist in 3-1

36 the environment and pose a risk to animals, plants, and people at elevated concentrations. A major source of PAHs in urban settings is coal tar-based sealants (Crane, 2014). While the use of coal tar-based sealants was banned in Minnesota in 2013, PAH accumulation in stormwater pond sediment from past use presents a significant challenge for stormwater pond maintenance and sediment disposal (Crane, 2010). The Minnesota Pollution Control Agency (MPCA) is the state regulatory agency primarily tasked with protecting and improving water quality in Minnesota. In its enforcement of the federal Clean Water Act (CWA), the MPCA administers the Municipal Separate Storm Sewer System (MS4) permit program. Subject to this program, the City is required to maintain an MS4 permit from the MPCA and annually submit an MS4 report to the MPCA (see Section 6.1). The MPCA also maintains a list of impaired waters; issues related to impaired waters are described in greater detail in Section The City currently requires implementation of water quality treatment best management practices (BMPs) for development and redevelopment projects consistent with City ordinance and consistent with the requirements of the applicable watershed management organization. The City may need to revise its performance standards to achieve higher levels of water quality treatment in the future in response to changing WMO, state, or federal requirements or to address impaired waters issues. 3-2

37 Table 3-1 Pollutants Commonly Found in Stormwater Runoff Stormwater Pollutant Examples of Sources Related Impacts Nutrients: Nitrogen, Phosphorus Sediments: Suspended and Deposited Decomposing grass clippings, leaves and other organics, animal waste, fertilizers, failing septic systems, atmospheric deposition Construction sites, other disturbed and/or non-vegetated lands, eroding streambanks and shorelines, road sanding Algal growth, reduced clarity, other problems associated with eutrophication (oxygen deficit, release of nutrients and metals from sediments) Increased turbidity, reduced clarity, lower dissolved oxygen, deposition of sediments, smothering of aquatic habitat including spawning sites, sediment and benthic toxicity Organic Materials Leaves, grass clippings Oxygen deficit in receiving waterbody, fish kill, release of nutrients. Pathogens: Bacteria, Viruses Hydrocarbons: Oil and Grease, PAHs (Naphthalenes, Pyrenes) Metals: Lead, Copper, Cadmium, Zinc, Mercury, Chromium, Aluminum, others Pesticides: PCBs, Synthetic Chemicals Chlorides Polycyclic Aromatic Hydrocarbons (PAH s) Trash and Debris Domestic and wild animal waste, failing septic systems Tar-based pavement sealant, industrial processes; automobile wear, emissions & fluid leaks; waste oil. Industrial processes, normal wear of auto brake linings and tires, automobile emissions & fluid leaks, metal roofs Pesticides (herbicides, insecticides, fungicides, rodenticides, etc.), industrial processes Road salting and uncovered salt storage Tar based pavement sealant Litter washed through storm drain networks Human health risks via drinking water supplies, contaminated swimming beaches Toxicity of water column and sediment, bioaccumulation in aquatic species and through food chain Toxicity of water column and sediment, bioaccumulation in aquatic species and through the food chain, fish kill Toxicity of water column and sediment, bioaccumulation in aquatic species and through the food chain, fish kill Toxicity of water column and sediment Carcinogenic to humans Degradation of the beauty of surface waters, threat to wildlife, clogged pipes and flooding Based on Minnesota Urban Small Sites BMP Manual (Barr Engineering Company, 2001) National Pollutant Discharge Elimination System (NPDES) The City of Apple Valley is subject to the National Pollutant Discharge Elimination System (NPDES) Stormwater Program mandated as part of the federal Clean Water Act (CWA). As a city with a population greater than 10,000, the City of Apple Valley is required to obtain Municipal Separate Storm Sewer System 3-3

38 (MS4) permit coverage from the MPCA for managing non-point source stormwater. The City s MS4 permit coverage requires that the City maintain a Stormwater Pollution Prevention Program (SWPPP) that addresses how the City will regulate and improve stormwater discharges. The MS4 permit and City s SWPPP are described in greater detail in Section 6.1. The MPCA reissued the MS4 General Permit in August, The current permit shifts from the initial focus on permit program development to measuring program implementation. The most significant revisions to the general permit include: Inventory of all ponds, wetlands, and lakes Post-construction stormwater standards including no net increase in total phosphorus, total suspended solids, or runoff volume from new development Post-construction stormwater standards including a net reduction in total phosphorus, total suspended solids, and runoff volume from redevelopment Inventory of facilities that contribute pollutants to stormwater discharges Procedures and schedule to determine treatment effectiveness of stormwater ponds Additional documentation requirements for minimum control measures The City submitted its MS4 SWPPP Authorization for Renewal under the revised general permit in December The City has already developed many of the best management practices (BMP) required in the NPDES permit. Where BMPs are not in place to address requirements of the revised general permit, the SWPPP identifies the City s plan to address these issues. The current SWPPP is presented in Appendix A of this Plan. The MPCA is in the process of issuing a new NPDES MS4 General Permit, expected in The 2018 update is expected to include additional requirements tracking performance of water quality ponds and other stormwater management BMPs. Additional information about the MS4 permit program and SWPPP requirements is available from the MPCA website: Impaired Waters and Total Maximum Daily Load (TMDL) Issues The CWA requires states to adopt water quality standards to protect the nation s waters. Water quality standards designate beneficial uses for each waterbody and establish criteria that must be met to support its designated use(s). Section 303(d) of the CWA requires each state to identify and establish priority rankings for waters that do not meet the water quality standards. In Minnesota, these responsibilities are administered by the MPCA. The list of impaired waters, sometimes called the 303(d) list, is updated by the state every two years. The MPCA performs Total Maximum Daily Load (TMDL) studies to address impaired waters. A TMDL is a threshold calculation of the amount of a pollutant that a waterbody can receive and still meet water quality standards. A TMDL study establishes the pollutant loading capacity within a waterbody and develops an allocation scheme amongst the various contributors, which include point sources, nonpoint 3-4

39 sources, and natural background, as well as a margin of safety. As a part of the allocation scheme, a waste load allocation (WLA) is developed to determine allowable pollutant loadings from individual point sources (including loads from storm sewer networks in MS4 communities), and a load allocation (LA) is developed to establish allowable pollutant loadings from nonpoint sources and natural background levels in a waterbody. A watershed restoration and protection strategy (WRAPS) is similar to a TMDL and may examine other waterbodies in a watershed in addition to impaired waterbodies. Both TMDLs and WRAPSs may result in implementation plans to address water quality issues of the affected waterbodies. Impaired waters within or closely adjacent to the City of Apple Valley are identified in Table 2-3 and Figure 2-9 and include: Alimagnet Lake Farquar Lake Keller Lake Long Lake East Lake (Lakeville) Runoff from the City of Apple Valley is tributary to Crystal Lake in the City of Burnsville. Crystal Lake was previously impaired for aquatic recreation due to excess nutrients, but has been delisted per the MPCA s 2018 draft impaired waters list. Runoff from the City of Apple Valley is also tributary to the Vermillion River, of which several reaches are identified as impaired (although the City is not assigned a waste load allocations). Total maximum daily load (TMDL) studies to address specific impairments are described in Sections through The City will generally take the lead to complete and implement TMDLs for impaired waters due to excess nutrients where the watersheds are located wholly within city boundaries. For impaired waters in the city whose watersheds extend into adjacent communities, the City may request the appropriate watershed management authority either take the lead (with the City participating as needed) or co-facilitate the completion and implementation of the TMDL. For TMDLs that have regional implications the City will cooperate with lead agencies as appropriate. The City of Apple Valley typically works towards meeting the waste load allocations identified in TMDLs through the continued implementation of its stormwater permitting program, municipal best management practices (BMPs) documented in its MS4 SWPPP, and capital projects performed by the City (alone or in cooperation with the BDWMO and VRWJPO). The City reports progress towards meeting TMDL wasteload allocations as part of its annual MS4 reporting. The highly-developed nature of the city reduces the availability of space for feasible water quality improvement projects to address water quality issues including impaired waters. Therefore, the City seeks to take advantage of opportunities for water quality improvement projects as part of redevelopment, pavement management, and other projects (see also Section 3.6). The City maintains a list of priority areas where such projects are likely and desirable to address impaired waters and other water quality issues. 3-5

40 Alimagnet Lake TMDL Alimagnet Lake is listed as impaired for aquatic recreation due to excess nutrients and eutrophication. This impairment is addressed in the Vermillion River Watershed TMDL Report (MPCA, 2015). The TDML generally identified stormwater runoff and internal loading as the primary sources of nutrients. The TMDL specified a wasteload load reduction of 30.8 lbs of total phosphorus per year (44% of the existing load) from the City of Apple Valley MS4. The reduction in total phosphorus loading from the City of Apple Valley is approximately 19% of the overall reduction required to meet water quality standards, which includes reductions from other MS4s draining to the lake and an approximately 60% reduction in internal phosphorus loading. The City cooperated with the City of Burnsville and the VRWJPO to complete the Alimagnet Lake Subwatershed Assessment Report (Wenck, 2016) to identify possible stormwater management options to reduce nutrient loading to Alimagnet Lake. The study evaluated nutrient removal and life-cycle costs of green infrastructure practices located in specific subwatersheds. The study focused especially on tax exempt properties, public lands, easements, and areas within city, county, and state right of way. The study recommended that the City continue to focus its initial efforts on an enhanced street sweeping schedule in the watershed directly tributary to the lake. The study also recommended implementation of improvements to Pond AL-P8. Additional BMP options are detailed in the 2016 report. Anticipated ongoing projects include aquatic invasive species management through mechanical or chemical means; fish survey, stocking, or removal; and lake monitoring using field measurements and lab sample analysis Long Lake and Farquar Lake Both Long Lake and Farquar Lake are listed as impaired for aquatic recreation due to excess nutrients and eutrophication. These impairments are jointly addressed in the Long and Farquar Lakes Nutrient TMDL (MPCA, 2009). The TMDL identified watershed and internal loading as significant sources of nutrients to both lakes; the impact on Farquar Lake is cumulative as it receives discharge from upstream Long Lake. The TMDL included waste load reductions of total phosphorus from the City of Apple Valley of 251 lbs/year for Long Lake and 169 lbs/year for Farquar Lake. These reductions represent 84% and 73% of the existing waste loads, respectively. Reductions in internal total phosphorus loading of 134 lbs/year for Long Lake and 310 lbs/year for Farquar Lake are also estimated as necessary to meet water quality standards for the WCBP ecoregion. In addition to installing in-ground projects, operational measures such as intensive street sweeping, whole lake drawdowns, and invasive weed management have regularly occurred to improve water quality. The City reconvened the TMDL Technical Advisory Committee in 2016 to review progress and to identify additional efforts to further reduce nutrients. From 2016 to 2017 a series of three meetings with varied outside stakeholders included: lake association members from both Long and Farquar Lakes; watershed organization, County and State agency staff. Together, the stakeholders provided feedback and guidance to craft the next 10 years of implementation. The 2017 TMDL Implementation Plan Update also includes cost estimates of recommended activities, along with a prioritized implementation plan. 3-6

41 Keller Lake TMDL Keller Lake is located along the far western border of the city adjacent to the City of Burnsville. Keller Lake is listed as impaired for aquatic recreation due to excess nutrients and eutrophication, and was included in the Crystal, Keller, and Lee Lakes Nutrient Impairment and Total Maximum Daily Load Report and Early Lake Water Quality Assessment (MPCA, 2011). The TMDL specified a wasteload load reduction of 130 lbs of total phosphorus per year from the City of Apple Valley MS4 (53% of the existing load from the city). The reduction in total phosphorus loading from the City of Apple Valley is approximately 29% of the overall reduction required to meet water quality standards, which includes reductions from other MS4s draining to Keller lake and an 80% reduction in internal phosphorus loading. To address the nutrient impairment of Keller Lake, the City of Apple Valley cooperated with the City of Burnsville and BDWMO to construct Whitney Pond in the fall of 2011 (BDWMO, 2012). Whitney Pond is a 2-acre stormwater basin located between Burnsville s Lac Lavon Park and Keller Park in Apple Valley. The pond is located in Burnsville on land donated by the City and treats stormwater from a significant portion of the Keller Lake watershed in Apple Valley that would otherwise drain to Keller Lake untreated. The pond is maintained by the City of Apple Valley. Whitney Pond does not achieve all of the nutrient load reduction required by the Keller Lake TMDL. In 2017, the City of Apple Valley completed a Keller Lake Subwatershed Assessment (Barr, 2017) to evaluate options for additional stormwater quality treatment within the Keller Lake watershed. The BDWMO also plans to perform an in-lake alum treatment of Keller Lake beginning in Anticipated ongoing projects include aquatic invasive species management through mechanical or chemical means; fish survey, stocking, or removal; and lake monitoring using field measurements and lab sample analysis East Lake TMDL East Lake is located south of the city in Lakeville. Stormwater runoff from the West Vermillion River drainage district (see Figure 2-2) is tributary to East Lake. East Lake is listed as impaired for aquatic recreation due to excess nutrients and eutrophication, and was included in the Vermillion River Watershed TMDL (MPCA, 2015). The TMDL specified a wasteload load reduction of 211 lbs of total phosphorus per year from the City of Apple Valley MS4 (36% of the existing load from the city). The reduction in total phosphorus loading from the City of Apple Valley is approximately 50% of the overall reduction required to meet water quality standards, which includes reductions from other MS4s draining to East Lake (primarily Lakeville) and an approximately 70% reduction in internal phosphorus loading. The City will continue its ongoing programs to reduce nutrient loading to East Lake, including implementation of its education program and its project review and permitting program. The City will cooperate with the VRWJPO and the City of Lakeville, as appropriate, to identify and implement additional measures to reduce nutrient loading to East Lake. 3-7

42 Chlorides High chloride concentrations in metropolitan area waterbodies are an emerging water quality concern. In 2015, the MPCA conducted a broader study, working with the cities and other stakeholders in the 7-County Twin Cities metropolitan area to assess chloride levels in regional lakes, streams, wetlands, and groundwater. The study identified two primary sources of chloride to metro water resources: (1) salt applied to roads, parking lots and sidewalks for deicing; and (2) water softener brine discharges to municipal wastewater treatment plants (WWTPs). The MPCA and stakeholders also worked together to develop a plan to restore and protect waters impacted by chloride, documented in the Twin Cities Metropolitan Area Chloride TMDL (MPCA, 2016). The City continues to implement chloride best management practices as part of its winter road management activities and through its education program Metropolitan Council Issues Local water management plans must be consistent with the Metropolitan Council s 2040 Water Resource Policy Plan (May, 2015). The plan emphasizes integrating planning for wastewater, water supply, and surface water management. The plan includes surface water management strategies designed to: Reduce "nonpoint" and "point" source pollution into receiving waters. Decrease stormwater runoff Partner with state, federal, and local units of government Work with stakeholders to promote protection of water bodies Decrease adverse impact on water quality in the region Develop target pollution loads for the major watershed basins The goals, policies, and implementation items included in this Plan have been developed with consideration for the Metropolitan Council s guidance and contribute to the regional water management objections identified by the Metropolitan Council. This Plan is also incorporated into the City s 2018 Comprehensive Plan, which is reviewed and approved by the Metropolitan Council Environmental Services Specific Water Quality Issues and Opportunities Stormwater Pond Management The City has an extensive network of stormwater ponds and maintains an inventory of its stormwater ponds consistent with the requirements of the City s MS4 permit. Some of these ponds were constructed before the construction of staged outlets to improve water quality performance (by better detaining more frequent rainfall events that carry the bulk of the pollutant loading) became common practice. Other ponds were alterations of existing wetlands. The City s MS4 permit (see Section 6.1) requires the City to inventory and assess the performance of stormwater ponds. The City has performed water quality modeling to evaluate pollutant loading to, and estimated pollutant removals achieved by, stormwater ponds and other best management practices. The City will also use modeling results to identify and evaluate water quality treatment in redevelopment 3-8

43 areas. Modeling results and monitoring data allow the City to prioritize water quality improvement efforts to target ponds and subwatersheds with high pollutant loading and/or poor pollutant removal for retrofits or other improvements to improve stormwater detention and water quality performance. The City will implement these retrofits as redevelopment opportunities, adjacent pavement management or other municipal projects, and funding allow as part of its overall capital improvement program (see Section 6.7) Stormwater System Maintenance Programming The City is responsible for the operation and maintenance of its stormwater infrastructure. This includes the periodic inspection of storm sewer components as specified in the City s SWPPP (see Section 6.2). The City s stormwater funding mechanisms are strained to keep pace with a growing list of issues and demands facing an aging stormwater system. To promote efficiency, the City currently inspects stormwater systems in coordination with its pavement management program. As roadway paving projects are implemented, the associated stormwater systems are inspected, cleaned, and repaired, if necessary. The City completes the mandatory MS4 inspections and generates maintenance requests when necessary Private Stormwater Facility Maintenance For projects requiring private and public entities to install and maintain stormwater infrastructure on their property (e.g., to satisfy stormwater performance standards of the WMOs or the City), the City requires maintenance agreements. The number and complexity of private stormwater management facilities within the city has grown over time. It is increasingly difficult to manage, monitor, and inspect these facilities. The City recognizes the need to streamline a program and devote resources to continue to manage this issue (see also Section 6.2.1). 3.2 Water Quantity and Flood Risk In a natural, undeveloped setting, the ground is often pervious, which means that water (including stormwater runoff) can infiltrate into the soil. Land development dramatically changes how stormwater runoff moves in the local watershed. The conversion of pervious ground surfaces to impervious materials (e.g., asphalt and concrete) reduces infiltration of water into the soil and increases the rate and volume of stormwater runoff. This can create significant problems for downstream water resources. Further, the reduced amount of infiltration means less water is being recharged into the groundwater system, which can result in decreased baseflows in creeks and streams and, potentially, a loss to the long-term sustainability of groundwater drinking water supplies. Although both high-water levels (flooding) and low-water levels are of concern to city residents and public officials/staff, more concern and attention is usually paid to flooding because it is a greater threat to public health and safety and can result in significant economic losses, including but not limited to: damage to structures, utilities, and transportation facilities, flood fighting and post-flood cleanup costs, business and property losses, increased expenses for normal operating and living during a flood situation 3-9

44 benefits paid to owners of flood insurance. Flooding may cause other damages that are harder to quantify, including the following: Flooding of roads so they are impassable to emergency vehicles and residents Shoreline erosion Increased pollution due to the inundation of hazardous materials Destruction of riparian habitats and vegetation such as grass, shrubs, trees, etc. Unavailability of recreational facilities for use by the public (e.g., inundation of shoreline) and/or restricted recreational use of waterbodies Alterations to the mix and diversity of wildlife species as a result of inundation of habitats The City is responsible for managing flood risk within its jurisdiction. The City also cooperates with the BDWMO and VRWJPO when appropriate to address water quantity issues, including inter-community issues (see also Section 6.3) Floodplain Management and Flood Insurance Studies Within the City of Apple Valley, the Federal Emergency Management Agency (FEMA) has mapped the floodplains of larger basins, creeks, and rivers on flood insurance rate maps (FIRMs). FEMA has published these maps as part of a Flood Insurance Study (FIS) encompassing the City of Apple Valley. The City s FIS, together with the City s floodplain ordinance, allows the City to participate in the federal government s National Flood Insurance Program (NFIP). Homeowners within FEMA-designated floodplains are required to purchase flood insurance. In some cases, homes within FEMA-designated floodplains on the FEMA floodplain maps may actually not be in the floodplain. To waive the mandatory flood insurance requirements for their homes, residents must remove their homes from the FEMA-designated floodplain by obtaining a Letter of Map Amendment (LOMA). In addition to FEMA-designated floodplains, the City has estimated 100-year water surface elevations based on recent hydrologic and hydraulic modeling (see Section 4.0). The City s 100-year water surface elevations may differ from 100-year water surface elevations shown on FIRMs due to input data, level of detail, and other factors. FEMA-delineated floodplains within the city were established prior to the publication of the National Oceanic and Atmospheric Administration s (NOAA) Atlas 14 precipitation data (see Section 2.1.1). As development and redevelopment occur within the city, appropriate rate and volume controls are necessary to avoid creating future flooding issues or exacerbating existing flooding issues. The BDWMO and VRWJPO established rate and/or volume control performance standards applicable to those areas of the city within their respective jurisdictions. The City adopted these performance standards (see Section 5.2.1) Intercommunity Drainage and Flow Rates There are areas of the city where stormwater runoff enters from other communities or is discharged to other communities. The affected cities need to manage intercommunity flow rates to prevent increases 3-10

45 beyond the capacity of downstream stormwater management systems. Regulation or resolution of intercommunity drainage is often a responsibility of WMOs. Within the VRWJPO and BDWMO, the City of Apply Valley is required to maintain existing intercommunity flow rates unless otherwise specified by an agreement (see Section 5.2.1). In some cases, reduction of intercommunity flow rates below existing conditions may be necessary to resolve existing flooding issues located outside of the city Specific Water Quantity Issues The City identified several areas of nuisance flooding through observation and hydrologic and hydraulic modeling efforts (see Section 4.0). These include localized flooding within roadways. The City considers most of these issues to be low priority due to the low risk to health and property. The City plans to address these issues as opportunities allow (e.g., pavement management programs, redevelopment opportunities, and coordination with other City or WMO projects). Hydrologic and hydraulic modeling results also identified potential areas of more significant flooding. Specific areas of concern are described in Section 4.0. The City will prioritize addressing these issues following the methodology and practices described in Section 6.0 Implementation Program. The City will also use the results of hydrologic and hydraulic modeling in municipal planning efforts to avoid creating or exacerbating flooding issues with future actions. 3.3 Wetlands Diverse wetland systems and shoreland areas are critical components of a healthy hydrologic system and positively affect soil systems, groundwater and surface water quality and quantity, wildlife, fisheries, aesthetics, and recreation. Development of land and other human activities can affect the hydrology and ecological functions of wetlands and shoreland areas. Overloading wetlands beyond their natural capacity with water, sediment, or nutrients can diminish their effectiveness in providing water quality benefits. Most natural wetland systems have developed with relatively low levels of sediment and nutrient inputs (riparian wetlands located in floodplains are an exception). When land use and upstream hydrologic systems become altered, the hydraulic, sediment, and nutrient loads may increase in magnitude and frequency. These changes may result in tipping the ecological balance to benefit non-native and invasive plant species, thereby reducing the benefits to wildlife, fisheries, amphibians, and humans. Degraded water quality in wetlands can pass on to downstream waters, contributing to degradation of additional resources. Wetlands and shoreland areas provide valuable habitat for many types of wildlife including waterfowl, songbirds, raptors, mammals, fish, and many species of amphibians. Maintaining and improving wildlife viability requires that water resources and land management activities consider the life cycles of various wildlife. By considering habitat benefits or detriments when approaching water resources projects, the City has the opportunity to protect and enhance these benefits. 3-11

46 The overall ecological health of wetland and shoreland areas can be significantly impacted by the presence or absence of vegetated buffers (see Section 3.3.1) and aquatic invasive species (see Section 3.3.3) Wetland and Shoreland Buffers Buffers are upland, vegetated areas located adjacent to wetlands and shoreland areas. Many of the hydrologic, water quality, and habitat benefits achieved by wetland and shoreland areas are directly attributable to, or dependent on, the presence of buffers. Vegetation reduces erosion by shielding the soil from rain and binding soil particles with root materials. Vegetation obstructs the flow of runoff, thereby decreasing water velocities, allowing infiltration, and reducing the erosion potential of stormwater runoff. As a physical barrier, vegetation also filters sediment and other insoluble pollutants from runoff. Vegetation scatters sunlight and provides shade, reducing water temperature in the summer, limiting nuisance algae growth, and reducing the release of nutrients from the sediment. Buffers also have habitat benefits; native plants provide the best food and shelter for native wildlife, fish, and amphibians. The presence of adequate buffers surrounding wetland and shoreland areas is critical to preserving the ecological functions and environmental benefits of downstream waterbodies, including wetlands. Establishing buffers in developed areas may be difficult, as existing structures may be located within the desired buffer area. Redevelopment offers an opportunity to establish adequate buffers in areas that are already developed. The City of Apple Valley has established vegetated buffer requirements that are consistent with the requirements of the BDWMO and VRWJPO; these requirements are included in Section At the request of the MDNR, the City of Apple Valley plans to develop a shoreland overlay zoning district for the properties directly abutting Keller Lake. The City will review proposed activities for these parcels relative to its shoreland ordinance and applicable buffer requirements. This task is included in the City s implementation program (see Table 6-2) City Wetland Classification and Management The City serves as the local governmental unit (LGU) responsible for administering the Wetland Conservation Act (WCA). As the LGU, the City s role includes requiring and verifying that all projects impacting wetlands meet the requirements of the WCA. The City also actively pursues opportunities to restore wetlands and create wetland buffers. City wetland classifications are listed in Section 2.7 and further described in Appendix B. The City implements wetland management performance standards through its wetlands ordinance and this Plan (see Section 5.2.4). The City further evaluated wetlands assigned to Manage 1-Restore or Manage 2-Restore to determine wetland restoration and enhancement priorities. The City developed wetland restoration priorities based on perceived ease of hydrologic restoration, quality/size of existing buffer, public/private ownership and existing vegetation quality. These sites include basins that are owned completely by one owner or in 3-12

47 public ownership, and were determined to have a medium or high vegetation restoration potential and high buffer quality during the field assessment. Wetland restoration or enhancement potential for an individual wetland was categorized as exceptional, high, medium, or low, based on criteria described in Appendix B. Generally, the priority sites for wetland restoration and enhancement are those that have experienced minor alterations in hydrology or have high floral diversity and large buffer areas. Most of these areas are located in public or open space and thus give the City the opportunity to implement restoration or enhancement opportunities that will provide benefits to the public. Specific wetland restoration or enhancement opportunities are listed according to drainage district in Section Aquatic Invasive Species (AIS) The term invasive species describes plants, animals, or microorganisms that are non-native, overrun or inhibit the growth of native species, and that 1) cause or may cause economic or environmental harm or harm to human health, or 2) threaten or may threaten natural resources or the use of natural resources in the state (Minnesota Statutes Chapter 84D.01). Aquatic invasive species (AIS) is a term given to invasive species that inhabit lakes, wetlands, rivers, or streams. Aquatic invasive species pose a threat to natural resources and local economies that depend on them. AIS identified in the City of Apple Valley include: Curlyleaf pondweed Keller Lake, Long Lake, Farquar Lake, Alimagnet Lake, Lac Lavon, Cobblestone Lake, and many stormwater ponds Eurasian watermilfoil Alimagnet Lake, Lac Lavon, Cobblestone Lake, Keller Lake, WVR-P321 Brittle Niad Lac Lavon Curlyleaf pondweed is of special concern due to its potential as a source of internal phosphorus loading. At the state level, permitting the management of AIS is the responsibility of the MDNR. The City cooperates with the MDNR, WMOs, and Dakota County to address the impacts of AIS at the local level. More information about AIS is available from the MDNR at: Groundwater Groundwater is a valuable resource that must be protected from contamination and conserved for sustainable use. The City of Apple Valley obtains its drinking water from wells extending into bedrock aquifers (see Section 2.4.1). Increased population in the Twin Cities metropolitan area has put increased pressure on these aquifers. In addition, development results in larger impervious areas and more compacted soils, thus decreasing opportunities for infiltration and recharge. Maintaining clean, safe groundwater supplies is critical to human and environmental health and to the economic and social vitality of communities. Groundwater can be contaminated by commercial and industrial waste disposal, landfills, leaking underground storage tanks, subsurface sewage treatment systems (SSTS), accidental spills, feedlots, and fertilizer/pesticide applications. Prevention of groundwater 3-13

48 contamination through best management practices is critical. Increased public awareness of the importance of groundwater protection on the public s general health and well-being is critical to promote responsible practices. While infiltration is often a preferred method of stormwater treatment, it may have negative consequences in areas with vulnerable groundwater resources. Many locations within the city are not favorable for infiltration (e.g., presence of tight soils or contamination). Infiltration practices must be implemented with consideration of guidance provided by the MPCA in its NPDES General Construction Stormwater permit (2013, as amended), MIDS guidance (2013, as amended), and the Minnesota Stormwater Manual. The City recognizes that surface water resources and groundwater resources are interdependent, although it is extremely difficult to quantify the exchange of water between surface waters and groundwater. The interaction of groundwater and surface water can have negative consequences on either resource. Contaminated groundwater discharged to surface waters may have a direct impact on surface water quality and/or habitat. Declines in groundwater levels may result in decreased water levels in lakes, which may limit recreational use, reduce habitat areas, and result in increased growth of aquatic plants including invasive species (via an increased littoral zone) Wellhead Protection The Minnesota Department of Health administers and enforces the Minnesota Water Well Code through its wellhead protection program. This program regulates the installation of new wells, and is intended to prevent contaminants from entering the recharge zones of public well supplies. As part of this program, cities that pump groundwater to supply their residents with drinking water are required to prepare wellhead protection plans (WHPPs). The City of Apple Valley has prepared and maintains a current WHPP, most recently updated in The WHPP delineates drinking water supply management areas (DWSMA) for the City s municipal groundwater wells, assesses the water supply s susceptibility to contamination from activities on the land surface, and establishes management programs, such as identification and sealing of abandoned wells, and education/public awareness programs. The DWSMA represents the boundaries of the recharge area to the well and is the area to be protected and managed by the wellhead protection plan. The City s wellhead protection areas are shown in Figure 2-4. Minnesota Rules 4720 requires that wellhead protection plans be submitted to watershed management organizations for review. The MDH guidelines for evaluating proposed stormwater infiltration projects in vulnerable wellhead protection areas is available from the MDH website:

49 3.5 Erosion and Sediment Control Sediment is a major contributor to water pollution. Stormwater runoff from streets, parking lots, and other impervious surfaces carries suspended sediment consisting of fine particles of soil, dust and dirt. Abundant amounts of suspended sediment are carried by stormwater runoff from actively eroding areas. Although erosion and sedimentation are natural processes, they are often accelerated by human activities, especially during construction activities. Prior to construction, the existing vegetation on a site intercepts rainfall and slows down stormwater runoff rates, which allows more time for runoff to infiltrate into the soil. When a construction site is cleared and graded, the vegetation (and its beneficial effects) is removed. Also, natural depressions that provided temporary storage of rainfall are filled and graded, and soils are exposed and compacted, resulting in increased erosion, sedimentation, and decreased infiltration. As a result, the rate and volume of stormwater runoff from the site increases (Minnesota Stormwater Manual, as amended). The increased stormwater runoff rates and volumes cause increased soil erosion, which releases significant amounts of sediment that may enter the City s water resources. Regardless of its source, sediment deposition decreases water depth, degrades water quality, smothers fish and wildlife habitat, and degrades aesthetics. Sediment deposition can also wholly or partially block culverts, manholes, and other stormwater facilities, causing flooding. Sediment deposition in detention ponds and wetlands also reduces the storage volume capacity, resulting in higher flood levels and/or reducing the amount of water quality treatment provided. Suspended sediment, carried in water, clouds lakes and streams and disturbs aquatic habitats. Sediment also reduces the oxygen content of water and is a major source of phosphorus, which is frequently bound to the fine particles. Erosion also results in channelization of stormwater flow, increasing the rate of stormwater runoff and further accelerating erosion. If erosion and sedimentation increase, the City s stormwater management systems (e.g., ponds, pipes) require more frequent maintenance, repair, and/or modification to ensure they will function as designed. Monitoring the stormwater system, including inspection of sediment build-up in stormwater ponds, continues to be an important task for the City. The City is aware of existing erosion and sedimentation problems at various stormwater ponds and pond inlets and actively works to design and budget for solutions as described in the Implementation Plan. In recognition of these issues, the City s ordinances (City Code chapter 152) and approval processes address erosion and sediment control at construction sites. The current ordinance has a disturbance threshold of 3,500 square feet or 20 cubic yards of soil. The ordinance requires implementation of temporary and permanent erosion and sediment control measures for developments and other projects. The City will continue its ongoing review of its erosion control program to evaluate its effectiveness and improve it where possible and feasible. In addition, the VRWJPO reviews projects meeting specific triggers for compliance with WMO erosion and sediment control standards. In addition to meeting City and applicable WMO requirements, owners and operators of construction sites disturbing one or more acres of land must obtain a National Pollutant Discharge Elimination System (NPDES) Construction Stormwater Permit from the MPCA. Owners/operators of sites smaller than one 3-15

50 acre that are a part of a larger common plan of development or sale that is one acre or more must also obtain permit coverage. A key permit requirement is the development and implementation of a Stormwater Pollution Prevention Plan (SWPPP) with appropriate best management practices (BMPs). The SWPPP must be a combination of narrative and plan sheets that: (1) address foreseeable conditions, (2) include a description of the construction activity, and (3) address the potential for discharge of sediment and/or other potential pollutants from the site. The SWPPP must include the following elements: Temporary erosion prevention and sediment control BMPs Permanent erosion prevention and sediment control BMPs Permanent stormwater management system Pollution prevention management measures A project s plans and specifications must incorporate the SWPPP before applying for NPDES permit coverage. The permittee must also ensure final stabilization of the site, which includes final stabilization of individual building lots. 3.6 Opportunities The City of Apple Valley has several distinct opportunities which may assist them in implementing this plan. The City will actively pursue these opportunities Watershed Management Organization Cooperative Efforts and Funding The City of Apple Valley cooperates with the BDWMO and VRWJPO to address surface water management issues as opportunities allow. In the past, these WMOs have provided technical support and funding assistance in completing joint projects within the city. The City will continue to collaborate with and contribute to these organizations to maximize mutual benefits. City staff will continue to participate as active members of WMO Technical Advisory Committees (TACs) attending WMO meetings and participate in WMO programs and projects, as requested. Specific opportunities for collaboration include proposed projects included in the BDWMO and VRWJPO capital improvement programs. The City may also benefit by leveraging educational materials and opportunities developed by the WMOs to promote good watershed stewardship among its residents Partnership with Neighboring Cities The City will continue to seek opportunities to partner with neighboring cities to address intercommunity hydraulic and water quality issues. Examples of such activities include collaborative efforts with the City of Burnsville to improve water quality of Alimagnet Lake and Keller Lake Redevelopment Opportunities Much of the City of Apple Valley is fully developed. Opportunities for updating and upgrading the city storm drainage system in developed areas exist primarily through redevelopment activities. As private and public properties redevelop, the City will implement the policies and programs of this plan. The City will continue to be proactive in using the regulatory controls at its disposal to ensure that opportunities 3-16

51 presented by redevelopment to improve the stormwater system and implement the policies of this plan are not lost Low Impact Development Practices Existing development, limited space, and poor site conditions (e.g., soil contamination, low infiltration capacity) throughout many areas of the city limit opportunities for additional stormwater management infrastructure. To mitigate the difficulty and expense of stormwater infrastructure to serve development and re-development sites, the City will continue to foster sustainable development and work to establish a balance between urban and natural systems. The City will promote the use of low impact development practices (e.g., green roofs, rain gardens, bioswales, pervious pavement, water reuse) throughout the City, where appropriate. These techniques promote water quality improvements and reduction of runoff volumes to receiving waters Coordination with Other City Programs Coordinating stormwater and surface water management activities with other City programs presents an opportunity to increase operational efficiency, reduce costs, and limit the frequency and duration of disruptions to City services. The City s pavement management program, for example, may be coordinated with stormwater management activities so that potentially disruptive maintenance or improvements may be performed simultaneously with road maintenance and reconstruction, minimizing the number of closures. 3-17

52 4.0 Stormwater System Analysis The City performed water quality modeling and hydrologic and hydraulic modeling for areas of the city not previous modeled concurrent with the development of this SWMP. The modeling reflects current development conditions. This section gives an overview of the recent modeling effort and provides some information about previous models. Results of the performed as part of this SWMP are summarized in tables and figures included in Appendix C (hydrologic and hydraulic modeling) and Appendix D (water quality modeling). 4.1 Mapping and Data The storm sewer network used in the hydrologic and hydraulic model was constructed with information from the City's existing electronic storm sewer database, including manholes, catch basins, pipes, pumps, and ponds. Additional details including ground elevations of manholes and catch basins; pipe size, type, length, and invert elevations; and stormwater pond grading information were obtained from as-built drawings or project-record drawings. The City s storm sewer system is presented in Figure Hydrologic Watershed Modeling The City used the U.S. EPA s Storm Water Management Model (SWMM), with a graphical interface provided by Computational Hydraulics, Inc. Software XP Software (PCSWMM version 7), as the hydrologic/hydraulic computer-modeling package for the modeling completed for this SWMP. Previous versions of hydrologic and hydraulic models used in development of the 2008 SWMP were constructed using HydroCAD software. PCSWMM software uses design storms and local rainfall data, coupled with watershed characteristics, to generate local runoff (overland, channel, stream, etc.), which it then routes downstream into storm sewer pipes or through open ditch networks to a final receiving water body. PCSWMM accounts for storage in ponding areas or ditches, backflow in pipes or ditches, surface flooding, as well as tailwater conditions that may exist and affect upstream discharges or pipe flows. More information on the PCSWMM models completed for the 2018 SWMP are provided in a technical memorandum provided to the City. Results from the PCSWMM simulations are included in Appendix C Hydrologic Modeling Technical Background The amount of runoff from a watershed depends on numerous factors, including the total watershed area, the soil types present in the watershed, the percent impervious area in the watershed, the runoff path through the watershed, and the slope of the land within the watershed. This section summarizes the watershed runoff characteristics used in the PCSWMM models for the 2018 SWMP. Watershed Total Area: The initial watershed delineation was performed in ArcGIS based on a digital elevation model (DEM) created by the Minnesota DNR. The DEM was modified by adding building outlines inferred from the raw LiDAR data collected by the Minnesota DNR. Stormwater flow paths and ponding locations were mapped onto the DEM based on the City s storm sewer database and the 4-1

53 National Wetland Inventory (NWI). An automated geospatial information system (GIS) process was then used to delineate the boundaries of watersheds that contributed to each ponding location, or watershed outlet. These watersheds were further subdivided by manually delineating significant catch basin clusters as additional watershed outlets points and then re-running the automated delineation process. The watersheds delineated by this automated process were manually reviewed and modified to correct errors in the automated process. Watersheds tributary to ponds are shown alongside the City s storm sewer network in Figure 4-2. A total of 2,702 separate watersheds were delineated and modeled for the 2018 SWMP, encompassing the Alimagnet Lake, Black Dog, Keller Lake, Lac Lavon, East Vermillion River and West Vermillion River drainage districts (see Figure 2-2). The Keller Lake and Lac Lavon drainage districts were combined into a single model. Watersheds contributing to the Minnesota Zoo and Lebanon Hills areas in the northern part of the city were not included in the modeling for this Plan. Contributing areas within Burnsville and Lakeville that were connected to Apple Valley storm sewer were included in the models, but were modeled in less detail (i.e., larger watersheds) compared to the watersheds within Apple Valley. Areas within Burnsville that drain to Alimagnet Lake or Keller Lake were included in the model by incorporating inflow hydrographs from XP-SWMM models shared by the City of Burnsville. Table 4-1 summarizes the modeled areas. Table 4-1 Modeled Areas Model Modeled Area (acres) Number of Watersheds Alimagnet Lake Black Dog East Vermillion River 3,757 1,044 Keller Lake/Lac Lavon 1 1, West Vermillion River 4,866 1,278 (1) Includes inflows from City of Burnsville XP-SWMM models Downstream Discharge Point Alimagnet Lake (pumped outlet to West Vermillion River drainage district) MnDOT stormwater pond along 35E in Burnsville Cobblestone Lake (pumped outlet) Keller Lake outlet to Crystal Lake Central Interceptor outlet to Lakeville Depression Storage: Without accurate field measurements, the amount of depression storage is difficult to determine and varies from impervious to pervious surfaces. Published information on the watershed characteristics of depression storage was considered for this study. For the 2018 PCSWMM model, depression storage values of 0.06 inches and 0.17 inches were used in all watersheds for impervious and pervious areas, respectively. Infiltration: The process of rainwater entering soil is known as infiltration. The rate of infiltration is dependent on physical soil characteristics, such as soil texture and particle size. Information from the 4-2

54 SSURGO soil database, created and maintained by the NRCS, was used as the basis for estimating the infiltration rates of soils in the modeled areas. Parameters for the Horton infiltration equation were assigned to each hydrologic soil group (HSG) and area-weighted Horton parameters were calculated for each watershed using ArcGIS. For urban soil series where the HSG was undefined in the SSURGO database, the HSG was manually assigned based on a review of the general soil characteristics and the HSG of neighboring soils. Table 4-2 summarizes the Horton infiltration rate parameters for each hydrologic soil group. Table 4-3 summarizes the assignment of HSG classifications for urban soil series. Table 4-2 Initial and Final Infiltration Rates Hydrologic Soil Group F 0 (in/hr) F c (in/hr) A B C D Table 4-3 Hydrologic Soil Groups for Urban Soil Series Soil Series Hydrologic Properties Hydrologic Soil Group Chetek Outwash, slow to very rapid runoff B Hubbard Sandy B Waukegan Well drained, little runoff B Kingsley Well drained, medium or rapid runoff C Watershed Impervious Percentage: An impervious surface GIS feature class created for the City was used to estimate the proportion of impervious surface in each watershed. The impervious surface feature class was modified to differentiate areas where impervious surfaces were directly connected to storm sewer system inlets from areas where runoff from impervious surfaces would flow across pervious areas before entering the storm sewer system. The criteria used to estimate the proportion of directly connected impervious surface is summarized in Table

55 Table 4-4 Directly Connected Impervious Surface Impervious Surface Characteristics Proportion of Directly Connected Impervious Surface (%) Water 100 Impervious surface within 20 feet of road centerlines 100 Impervious surface in commercial or high density development areas and not within 20 feet of road centerlines Impervious surface in low density development areas (e.g. single family residential) and not within 20 feet of road centerlines Pervious surface 0 Rainfall Information: The City evaluated four 24-hour storm events: the 1-, 2-, 10-, and 100-year, 24-hour Atlas 14 storm events. The hyetographs for the 24-hour storms were developed using a nested methodology that incorporates the peak rainfall intensities from shorter-duration storm events within a single 24-hour hyetograph Hydrologic Watershed Modeling Results Summary Selected PCSWMM model results are tabulated in Appendix C for each of the stormwater basins identified in the City s stormwater system GIS database. The tables summarize the direct contributing area to each of the basins, the total contributing area to each of the basins (including the contributing area to upstream ponds), the starting water elevation for each pond, and the 100-year high water level (HWL) for each pond. Appendix C also contains map figures showing the location and the 100-year HWL of each modeled basin. Complete modeling results, including peak runoff rates and volumes corresponding to the 10-year and 100-year events, as well as peak water surface elevations and storage volumes corresponding to the 100-year event are tabulated in the report Apple Valley Stormwater Modeling Methodology and Results (Barr, 2018). Flow routing information is presented in Map 1 of the modeling report. Additional detailed modeling information is available from the City upon request. The 100-year HWLs for the modeled ponds generally increased compared to the corresponding HWLs reported in the 2008 SWMP. Increases were anticipated due to the increase in the simulated 100-year rainfall depth from 6.1 inches (TP40) to 7.4 inches (Atlas 14) as well as the increase in peak rainfall intensity from the Atlas 14 rainfall distribution compared to the SCS type II rainfall distribution. The PCSWMM models simulate the storm sewer network with much greater detail than the HydroCAD models used for the 2008 study. This higher resolution allows areas of localized ponding due to restrictive storm sewer pipe capacity to be identified. The City will use the hydrologic modeling results to identify pipes and basins that may be undersized to convey and store the increased runoff that is due to the higher Atlas 14 rainfall intensity and depth. Locations of potential localized flooding are listed by major drainage area in Appendix C. 4-4

56 4.3 Water Quality Modeling Six water quality models were built to model City storm basins within the Black Dog, Lac Lavon, Lower East Vermillion River, and West Vermillion River drainage districts (see Figure 2-2). The West Vermillion River watershed was divided into three separate models due to input limitations of the P8 modeling software The Keller Lake, Alimagnet Lake, and Upper East Vermillion River (Long Lake and Farquar Lake) watersheds have existing P8 models and were not included in this modeling effort Water Quality Technical Background The City used the P8 (Program for Predicting Polluting Particle Passage through Pits, Puddles and ponds, IEP, Inc. 1990) Urban Catchment (computer) model to compute water quality modeling performed as part of the 2018 SWMP. P8 is a useful diagnostic tool for evaluating and designing watershed improvements and best management practices (BMPs). P8 uses long-term climatic data so that watersheds and BMPs can be evaluated for varying hydrologic conditions. When evaluating the results of the modeling, it is important to consider that the results provided are more accurate in terms of relative differences than in absolute results. The model predicts the percent difference in total suspended solids (TSS) and total phosphorus (TP) reduction between various BMP options in the watershed fairly accurately. It also provides a realistic estimate of the relative differences in TSS, TP and water loadings from the various subwatersheds and major inflow points to a lake or other receiving water. However, since runoff quality is highly variable with time and location, the values for TSS and TP loadings given from the model for a specific watershed may not necessarily reflect the actual loadings. Various site-specific factors, such as lawn care practices, illicit point discharges and construction-related erosion are not accounted for in the model. The model provides values that are considered to be typical for the region and the watershed s respective land uses Water Quality Model Inputs Each of the storm basins listed in the City s GIS layer data was included in the P8 model with the exception of those listed in Table 4-5. The P8 model subwatersheds were based on the same subwatershed divides as the PCSWMM models and then merged these subwatersheds to a pond level scale. The open water areas were subtracted from the subwatershed area since there is no pollutant runoff from the water surface. Table 4-6 summarizes the number of City storm basins, the number of subwatersheds and the total contributing area for each of the six models. Table 4-5 City storm basins not included in P8 models City Storm Basin P8 Model Watershed Reason Not Modeled WVR-P25 Middle West Vermillion River No visible BMP at this location. Dump Pad Middle West Vermillion River No visible BMP at this location. WVR-P13 Lower West Vermillion River No visible BMP at this location. 4-5

57 Table 4-6 Areas modeled in P8 Watershed Modeled Number of Storm Basins Modeled Number of Subwatersheds Contributing Watershed Area (ac) 1 Black Dog Lac Lavon Lower East Vermillion River ,357.0 Upper West Vermillion River Middle West Vermillion River ,573.5 Lower West Vermillion River ,559.3 (1) Contributing area does not include any open water areas. An area weighted Soil Conservation Service (SCS) curve number for the pervious areas was calculated based on the hydrologic soil group type and the assumption that the pervious areas were open spaces with good grass cover. The soil types and corresponding curve numbers are shown in Table 4-7. The directly connected and indirectly connected impervious area fractions were calculated using the same impervious layer data as the PSWMM models. Table 4-7 Hydrologic Soil Group Type and TR-55 curve number Hydrologic Soil Group Type Curve Number A 39 A/D 80 B 61 B/D 80 C 74 C/D 80 D 80 The P8 models were run using hourly precipitation and air temperature data from the Minneapolis/St. Paul (MSP) airport for the 1991 through 2016 water years (October 1, 1991 September 30, 2016). The EPA Nationwide Urban Runoff Program (NURP) 50th percentile particle file was used in the P8 model to estimate TSS and TP loadings from the watershed area because it represents typical particle buildup and wash-off for urban-type developments. Pond depths and bathymetry were calculated from plan sheet data when available. If no plan sheet data was available, the wet pond depths were estimated using the National Wetland Inventory (NWI) wetland type and the bathymetry calculated assuming 4:1 side slopes and the NWI estimated depth. Dry pond and 4-6

58 infiltration basin depths and bathymetry were calculated from LiDAR if plan sheet data was unavailable. Pond outlet data and rating curves were created from the PCSWMM model results Water Quality Model Results The P8 model results are tabulated in Appendix D for each of the stormwater basins identified in the City s GIS stormwater system data. The tables summarize the contributing area to each of the basins and the annual TP and TSS loading, loading per contributing acre and removal efficiency of each of the basins. The tables also include some basins not shown in the City s storm basin GIS data. The figures included in Appendix C present estimated total phosphorus loading from modeled subwatersheds and the estimated treatment efficiency (i.e., percent of total phosphorus load removed) by stormwater best management practices located in modeled subwatersheds. The City will use the water quality modeling results to identify areas of high pollutant loading and low treatment efficiency and prioritize those areas for more detailed evaluation (see Table 6-2). The City will use water quality models to evaluate the expected benefit of potential water quality projects when performing feasibility studies. 4-7

59 Section 4 Figures Figure 4-1 Figure 4-2 Stormwater Drainage System Stormwater Drainage Areas

60 5.0 Goals and Policies The City has developed a number of goals and policies to proactively manage stormwater and surface water resources within the City. The goals and policies described here are designed to continue to improve the quality and effectiveness of water resource planning and management in the City. These goals and policies have been developed to complement county, regional, and state goals, policies and management activities (note that county, regional, and state requirements may apply in addition to the goals, strategies, and policies described herein). 5.1 Goals The City has established the following goals related to stormwater and surface water management: 1. Manage the risk of flooding to minimize adverse effects to life, property, and infrastructure. 2. Manage surface water resources to promote healthy ecosystems, preserve water quality, and meet applicable water quality standards. 3. Manage stormwater runoff to reduce negative impacts to water resources and infrastructure. 4. Protect, restore, and enhance wetlands and natural areas. 5. Protect the quality and quantity of groundwater. 6. Protect water and natural resources through responsible management of development and redevelopment activities. 7. Promote stewardship of water and environmental resources through education, public involvement, and cooperation. 5.2 Policies The City has developed policies to support the goals identified in Section 5.1. The policies included in this section are organized into the following topic areas: Flooding, water quantity, and rate control Surface water quality Stormwater management Wetland and natural area management Groundwater management Development and redevelopment Education and public outreach Note that while policies are categorized for ease of reference, several policies address more than one issue or resource and/or promote multiple benefits Flooding, water quantity, and rate control policies Policy 1.1 The City requires all of the following minimum building elevations for structures constructed as part of new development and re-development projects: The lowest floor (including basement) shall be: 5-1

61 o at least 1 feet above the estimated 100-year water surface elevation o at least 3 feet above the seasonal high local groundwater elevation The lowest opening shall be: o at least 3 feet above the estimated 100-year water surface elevation o at least 1 foot above the stormwater facility emergency overflow elevation Policy 1.2 Policy 1.3 Policy 1.4 Policy 1.5 Policy 1.6 Policy 1.7 The City shall establish and maintain estimated 100-year flood elevations within its jurisdiction based on National Oceanographic and Atmospheric Administration Atlas 14 Volume 8 herein referred to as Atlas 14. The City shall consider events larger than the 100-year event, extended duration events, and flood/drought cycles when establishing minimum building elevations and considering resilience of stormwater infrastructure, focusing on areas with large tributary watersheds and landlocked basins. The City shall identify areas of potential flooding within the city and develop strategies to reduce the risk of flooding in these areas. In areas where strategies to provide 100-year flood protection are not feasible, the City will develop emergency response plans. The City requires that new development and redevelopment activities do not increase peak runoff rates relative to pre-project runoff rates for the 1-year, 2-year, 10-year, and 100-year critical storm event. The City may impose more stringent rate control requirements if the capacity of the downstream system is limited. Within the VRWJPO, the City adopts numerical intercommunity flow standards at boundaries as identified in the VRWJPO Hydrologic Model (2009, as amended). The City requires that development and redevelopment within landlocked basins do not increase runoff volume relative to pre-project conditions Surface water quality policies Policy 2.1 Policy 2.2 Policy 2.3 The City will classify and manage priority waterbodies in a manner consistent with the management and regulatory requirements of watershed management organizations and other applicable state and local agencies. The City will cooperate with the MPCA and watershed management organizations in the development and implementation of Total Maximum Daily Load (TMDL) studies and Watershed Restoration and Protection Strategies (WRAPS) studies. The City will develop and implement strategies to preserve or improve existing water quality in waterbodies that currently meet state and WMO water quality criteria. 5-2

62 Policy 2.4 Policy 2.5 Policy 2.6 Policy 2.7 Policy 2.8 Policy 2.9 The City will manage lakes to promote abundant and diverse emergent and submergent native-dominated plant communities. The City will cooperate with the Minnesota DNR and Dakota County to manage the negative impact of aquatic invasive species on City waterbodies. The City will continue to monitor water quality of priority waterbodies in cooperation with watershed management organizations, the Metropolitan Council Citizen-Assisted Monitoring Program (CAMP), and others. The City will emphasize adaptive management in implementing its surface water management program. The City will evaluate the performance of management actions and use the results to inform future management decisions, using quantitative data, where available. The City will prioritize water resource management projects with consideration for estimated benefit, cost, feasibility, and probability of success (reference implementation program). Prioritization will include consideration of multiple benefit types (e.g., water quality benefits, flood risk reduction benefits, public access, public health and safety) and the relative degree or extent of each benefit. The City will consider both in-lake and watershed best management practices (BMPs) in managing water resources. The City will use best-available science to determine factors affecting water quality in specific waterbodies and will cooperate with other jurisdictions to employ the full range of available management strategies in a feasible manner. Policy 2.10 The City shall prioritize the use of natural materials and soft-armoring techniques for shoreline stabilization and shall consider specific site conditions, energy dissipation potential, preservation of natural processes and habitat, and aesthetics. Policy 2.11 The City will cooperate with watershed management organizations, lake associations, residents, and other stakeholders to develop and implement individual resource management plans to address specific resources, as needed Stormwater management policies Policy 3.1 Policy 3.2 Policy 3.3 The City will continue to implement the stormwater system maintenance best management practices/good housekeeping practices defined in its Municipal Separate Storm Sewer System (MS4) Stormwater Pollution Prevention Program (SWPPP). The City shall maintain its stormwater management system to ensure the continued effectiveness of stormwater treatment, conveyance, and flood risk reduction functions. The City will tailor its winter road management practices (e.g., de-icing) to reduce negative environmental impacts while achieving public safety. The City will consider tools and practices 5-3

63 identified in the MPCA s Twin Cities Metro Area Chloride Management Plan to quantify current practices, identify areas of improvement, and track progress. Policy 3.4 The City shall continue to fund stormwater management activities through its stormwater utility. The City may use storm sewer improvement taxing districts to fund specific projects, as necessary Wetland and buffer policies Policy 4.1 Policy 4.2 Policy 4.3 Policy 4.4 Policy 4.5 The City will continue to serve as the Local Government Unit (LGU) for administration of the Wetland Conservation Act of 1991 and all subsequent amendments in all applicable portions of the City. The City will also apply appropriate wetland protection standards promulgated through the NPDES MS4 permit and the watershed organizations covering the city. The City will maintain a wetland inventory. The City will continue to use the Minnesota Routing Assessment Method (MnRAM) to assess wetland functions and values and will identify priority wetlands for restoration and enhancement opportunities. The City will continue to require that applications for new development or redevelopment activities include a field inventory/delineation and classification of wetlands on the impacted property (or a determination that no wetlands are present). The City requires water quality treatment of all stormwater prior to discharge to wetlands. The City requires that hydrologic impacts to wetlands resulting from development and redevelopment activities do not exceed the following: Wetland Classification Allowable bounce Allowable inundation period (1-year event) Allowable inundation period (2-year event) Allowable inundation period (10-year event) Protect Existing Existing Existing Existing Manage 1 Existing ft Existing + 1 day Existing + 1 day Existing + 7 days Manage 2 Existing ft Existing + 2 days Existing + 2 days Existing + 14 days Manage 3 Existing ft Existing + 7 day Existing + 7 day Existing + 21 days Policy 4.6 The City requires vegetated buffers zones adjacent to wetlands to be established for development and redevelopment activities. Required buffer zone widths from the delineated edge of the wetland are based on the type of development and wetland classification, as follows: Development Type New development and subdivisions Wetland Classification Average buffer width (ft) Minimum buffer width (ft) Minimum building setback from buffer (ft) Protect Manage Manage

64 Manage Re-development All types Policy 4.7 Policy 4.8 Policy 4.9 The City requires that protective buffer zones be established consistent with the procedures and criteria established in City ordinance chapter The protective buffer zone shall be memorialized in perpetuity by a written document approved by the City and a certified survey of the property which shall be recorded by Dakota County. The document shall establish the location of any buffer zones, restrictions, allowances, and management requirements. Where protective buffer zones are established, the City requires the upland boundary line to be identified by permanent markers, approved by the City. The City requires vegetated buffer zones of at least 16.5 feet in width to be established for development and redevelopment activities on properties abutting the following named waterbodies: a. Alimagnet Lake b. Lac Lavon c. Long Lake d. Keller Lake e. Farquar Lake Policy 4.10 The City requires vegetated buffer zones of at least 16.5 feet in width to be established for development and redevelopment activities on properties abutting stormwater ponds that were not constructed upon pre-existing or altered wetlands. Altered wetlands shall be consistent with Policy 4.6. Policy 4.11 The City will pursue opportunities to enhance the functions, values, and ecological diversity of wetlands and adjacent uplands, as resources allow Groundwater management policies Policy 5.1 Policy 5.2 Policy 5.3 The City requires owners of properties containing subsurface sewage treatment systems (SSTS) to have those SSTS inspected every three years and to submit inspection records, signed by a certified septic tank inspector, to the City. The City will collaborate with Minnesota DNR, Dakota County, Metropolitan Council, watershed management organizations, and other stakeholders in the development of groundwater management guidance and resources, as opportunities dictate. The City will consider potential impacts to groundwater quality and quantity in evaluating and implementing City projects. 5-5

65 Policy 5.4 Policy 5.5 The City will promote the use of infiltration, conservation, and water reuse to protect groundwater supply through its education program or other opportunities. The City will maintain an updated Wellhead Protection Plan (WHPP) and implement the best management practices identified in the WHPP Development, redevelopment, and land disturbance policies Policy 6.1 Policy 6.2 Policy 6.3 Policy 6.4 Policy 6.5 The City requires compliance with all applicable post-construction water quality criteria for new and redevelopment activity adopted by the Black Dog Watershed Management Organization and the Vermillion River Watershed Joint Powers Organization, as described in the BDWMO Watershed Management Plan (2012, as amended) and VRWJPO Standards (2016, as amended). The City requires that all new, redeveloped, or expanded commercial, industrial, multiple residential, or institutional development provide infiltration for a volume equivalent to 0.5 inches of runoff over the area of the development. The City requires that new and redevelopment activity of 0.2 acres or more shall be required to achieve no-net-increase in average annual total suspended solids (TSS) and total phosphorus (TP) loading compared to the pre-development condition of the site. The City may require additional treatment measures as needed for any development or redevelopment activity to protect downstream receiving waters, including, but not limited to, additional measures in TMDLs or WRAPS watersheds plans. New and redevelopment activity of 0.2 acres or more shall be required to achieve no-netincrease in average annual runoff volume compared to the pre-development condition; linear projects that do not increase the amount of impervious surface are exempt from this policy. With consideration for site-specific factors, the City may prohibit infiltration systems: Where industrial facilities are not authorized to infiltrate industrial stormwater under an NPDES/SDS Industrial Stormwater Permit issued by MPCA. Where vehicle fueling and maintenance occur. Where the bottom of the infiltration basin is less than 3 feet to bedrock or seasonally saturated soils. Where high levels of contaminants in soil or groundwater will be mobilized by infiltration. Within the areas designated as Very High Vulnerability and High Vulnerability within the Drinking Water Supply Management Area (DWSMA) The City restricts the use of infiltration systems in areas: 5-6

66 With low permeability soils (i.e., Hydrologic Soil Group D soils) or where a confining layer exists below the proposed basin. Filtration or conservative drawdown rates should be considered in designing systems in HSG C soils. Within 1,000 feet upgradient or 100 feet down gradient of active karst features. Within the areas designated as: Moderate Vulnerability; and Low to Very Low Vulnerability within the Drinking Water Supply Management Area (DWSMA) Where soil infiltration rates are more than 8.3 inches per hour. Policy 6.6 New development and re-development activities of one acre or more of new impervious area are required to keep runoff volume for the 2-year 24-hour storm at or under the runoff volume for the existing condition. At its discretion, the City may modify or waive these requirements, based on consideration of any of the following: Soil borings indicate unsuitability for infiltration (e.g., hydrologic group soil types C or D, near active karst, within drinking water supply management areas, or where high levels of contaminants may be mobilized). Infiltration of the equivalent runoff volume is accomplished elsewhere within the same City drainage district and prior to discharge to a City jurisdictional boundary or priority lake. A significant potential for groundwater contamination exists based on Minnesota Department of Health s guidance document Evaluating Proposed Storm Water Infiltration Projects in Vulnerable Wellhead Protection Areas. Other circumstances that may affect feasible and prudent implementation of this policy. Policy 6.7 Policy 6.8 Policy 6.9 The City encourages infiltration as a preferred method of water quality treatment and volume control, where feasible. Infiltration practices should be designed with consideration for the guidance documents identified in policy The City will identify areas of significant regional infiltration in the city and manage these areas to preserve infiltration capacity. The City encourages the use of Low Impact Design (LID) techniques to minimize negative effects of development and redevelopment on stormwater infrastructure and natural resources. Policy 6.10 The City promotes the use of the following reference documents to guide application and design of Best Management Practices (BMPs) and Low Impact Development (LID) to achieve the performance standards described in this Plan and applicable City regulatory documents: The Vermillion River Watershed Joint Powers Organization Standards Minimal Impact Design Standards (MIDS) calculator (2013, as amended) Minnesota Pollution Control Agency s Minnesota Stormwater Manual ( 5-7

67 Policy 6.11 Per City ordinance chapter 152, the City will continue to require a Natural Resources Management permit for projects that include: Movement of more than 20 cubic yards of soil Disturbance of 3,500 square feet or more of soil Any cutting, removal, destroying, or loss of 10% or more of the significant trees on any land (as defined in City ordinance chapter 152) Any other activity that changes the existing or natural contour of the land which changes drainage The Natural Resources Management permit includes erosion and sediment control requirements consistent with the requirements of the NPDES Construction Stormwater General Permit and the City s MS4 permit. Policy 6.12 For projects triggering an NPDES Construction Stormwater General Permit, the City requires project proposers to submit the NPDES SWPPP to the City as part of the application for City review. Policy 6.13 The City inspects construction sites to ensure compliance with the existing erosion and sediment control ordinance and with the site permit under NPDES rules administered by the MPCA (if applicable). Policy 6.11 The City will continue to require development and re-development to pay pro-rated costs to dedicate land and construct water quality infrastructure meeting City requirements Education and public outreach policies Policy 7.1 Policy 7.2 Policy 7.3 Policy 7.4 Policy 7.5 The City will continue to perform the education and public involvement activities described in its MS4 SWPPP, including at least one public opportunity to comment on the SWPPP. The City will continue to provide training to City staff regarding water resource management regulations and best management practices and demonstrate good watershed stewardship through City staff actions. The City will continue to provide regular updates to the City Council, Parks and Recreation Advisory Committee, and Planning Commission on the City s water resource management programs. The City will implement and revise its public education and involvement program to inform businesses, residents, and other stakeholders of the impact of human activities on water resources and promote behaviors that contribute to watershed stewardship. The City will cooperate with watershed management organizations and others to develop and distribute educational materials addressing water resource management issues (e.g., aquatic invasive species, groundwater conservation). 5-8

68 Policy 7.6 The City will share relevant monitoring, project, and education information with WMOs and other cooperating agencies, as requested. 5-9

69 6.0 Implementation Program This section describes the significant components of the City s SWMP implementation program, including capital projects, ordinance implementation and official controls, its NPDES MS4 permit, and operation and maintenance of the City s stormwater system. The implementation program for years is presented at the end of this section in a series of tables, as follows: Table 6-1 Implementation Program Capital Improvements Table 6-2 Implementation Program Programs, Studies, and Official Controls 6.1 NPDES MS4 Permit Under the U.S. Environmental Protection Agency s (EPA) Storm Water National Pollutant Discharge Elimination System (NPDES) Rules, the City of Apple Valley is required to maintain a Municipal Separate Storm Sewer System (MS4) permit for managing non-point source storm water. The City last renewed its MS4 permit in As part of the permit, the City must also prepare and maintain a Storm Water Pollution Prevention Program (SWPPP) addressing all requirements of the permit. The SWPPP outlines the appropriate best management practices (BMPs) for the City to control or reduce the pollutants in stormwater runoff to the maximum extent practicable. The City will accomplish this through the implementation of the BMPs outlined within its SWPPP. These BMPs are a combination of education, operation and maintenance, control techniques, system design and engineering methods, and other such provisions that are appropriate to meet the requirements of the NDPES permit. BMPs have been prepared to address each of the six minimum control measures as outlined in the rules: 1. Public education and outreach 2. Public participation/involvement 3. Illicit discharge detection and elimination 4. Construction site stormwater runoff control 5. Post-construction stormwater management 6. Pollution prevention/good housekeeping For each of these six minimum control measures, the City identified appropriate BMPs, along with measurable goals, an implementation schedule, and the persons responsible to complete each measure. Many of the policies included in this SWMP (see Section 5.0) directly or indirectly address the minimum control measures; applicable policies are noted in the BMP descriptions included in the SWPPP (see Appendix A). The SWPPP also incorporates the City s wellhead protection plan (WHPP) and includes measures to reduce the threat to drinking water to the maximum extent practicable. The SWPPP also includes BMPs to address existing impaired waters for which Total Maximum Daily Load (TMDL) studies have been completed (see Section ). Future NPDES permit revisions, TMDL studies, or other developments (e.g., City modeling efforts) may result in the identification of new or expanded BMPs to address City MS4 6-1

70 permit requirements. The City will identify appropriate BMPs and add them to the City s implementation program and SWPPP, where appropriate. Prior to June 30 of each year of the five-year permit cycle, the City must hold an annual opportunity to input on the adequacy of the City s SWPPP. The City also receives oral and written statements and considers them for inclusion into the SWPPP. Also prior to June 30, the City must submit an annual report to the MPCA. The City s SWPPP is included in this SWMP as Appendix A. The SWPPP BMP implementation program is incorporated into the City s overall stormwater implementation program presented in Table 6-2. The City s SWPPP (see Appendix A) contains more detailed discussion of individual BMPs. 6.2 Stormwater System Operation and Maintenance The City of Apple Valley recognizes that maintenance of all of the City s stormwater facilities is an important part of stormwater management. The City of Apple Valley is responsible for maintaining its stormwater system. Proper maintenance will ensure that the stormwater system continues to function as designed and provides the intended benefits. The City s operation and maintenance program is closely tied with the City s implementation of its NPDES MS4 permit and is incorporated into Table 6-2. The City s stormwater system includes not only pipes and constructed ponds, but also lakes, wetlands, ditches, swales, and other drainage ways as well as structural pollution control devices. In addition to more typical maintenance measures, maintenance of the stormwater system may also mean maintaining or restoring the ecological characteristics of the natural portions of the stormwater system. The City will regularly inspect and maintain key components of the system. Key components include storm sewer and culvert inlets, overflow drainage swales, stormwater ponding and water quality treatment basins, and riprap-protected banks, storm sewer, and culvert outlets. The City of Apple Valley is responsible for maintaining the stormwater facilities under City ownership. The Minnesota Department of Transportation is responsible for maintaining road ditches and culverts along Interstate 35E and Highway 77. Dakota County is responsible for maintaining road ditches and culverts along county state aid highways (CSAHs) and county roads. The City will also notify the owners of other publicly owned stormwater facilities if scheduled maintenance is needed according to periodic site inspections or maintenance plans on file Private Stormwater Facilities Owners of private stormwater facilities are responsible for maintaining the facilities in proper condition, consistent with the original performance design standards. Responsibilities include removal and proper disposal of all settled materials from ponds, sumps, grit chambers, and other devices, including settled solids. Owners of private stormwater facilities are required to provide the City with a maintenance plan as part of the project permitting process; the maintenance agreement defines who will perform the maintenance, the type of maintenance, and the maintenance intervals. The City maintains an inventory of these agreements. 6-2

71 6.2.2 Inspection and Maintenance of Structural Pollution Control Devices The City inspects all City-owned structural pollution control devices annually (with the exception of sump manholes). The City s current sump manhole cleaning schedule includes biennial inspection and cleaning. To justify an appropriate maintenance schedule for sump manholes, the City will document the number cleaned and inspected as well as the number full of sediment or debris. A map will be developed to identify which devices have been cleaned and inspected annually. If maintenance actions are required for an individual manhole as a result of the first two inspections, the City will increase the number of inspections as required in the NPDES Permit. All other structural pollution control devices will be inspected annually and appropriate maintenance actions will be taken according to the inspections. The City is also in the process of developing and maintaining an inventory of all pollution control devices in the city, consistent with current and anticipated future requirements of its MS4 permit (see Section ). The City will uses available monitoring and modeling data (see Section 4.0) to assess and track the performance of water quality practices, including stormwater management ponds Maintenance of Ponding Facilities Stormwater ponding facilities provide flood risk reduction and water quality benefits. However, if accumulated sediments are not periodically removed, such basins can experience a significant loss in necessary stormwater detention and pollutant removal capacity. If left unattended, these facilities can become overgrown with unwanted vegetation that may further reduce performance and hinder access for periodic maintenance. The City of Apple Valley periodically inspects stormwater storage basins and water quality treatment facilities to identify excessive sediment build-up, collected debris, and unwanted vegetation. The City will use inspection data and available water quality modeling results (see Section 4.0) to prioritize pond maintenance needs. For planning purposes, it is often assumed that delta cleanouts are performed at approximately 10 year intervals, with full pond dredging performed at longer intervals (e.g., 30 years). Overflow swales can become steep eroding channels if erosion problems are not addressed. Typical stabilization materials could include permanent geotextile erosion-control material or riprap accompanied by a properly designed filter material. Erosion problems are identified and addressed by the City s maintenance program. In general, vegetation in existing ponding facilities is allowed to grow naturally on the side slopes of the basin and is not mowed. This practice allows ponding facilities to act like natural wetland areas by providing nearby upland wildlife habitat Street Sweeping The City of Apple Valley has an active street sweeping program in an effort to reduce the amount of sediment, pollutants, and trash from reaching the storm sewer system and surface waters. The City sweeps City-owned streets a minimum of twice per year and on an as-needed basis using both mechanical and regenerative vacuum air sweepers. Streets are swept prior to flushing the water 6-3

72 distribution system in the spring and dense foliage areas are a priority during the fall. More intense street sweeping is performed in areas draining to impaired waterbodies. Additional details are included in the City s SWPPP (see Appendix A). The City will continue this effective program Adequacy of maintenance program The City s current operations and maintenance program described in the Apple Valley SWPPP is deemed as adequate to meet the conditions of the City s NPDES Permit and to maintain an effective stormwater management system. The City will continue and expand upon its operation and maintenance activities to ensure the system functions as designed. 6.3 Watershed Management Organization Roles and Responsibilities The City of Apple Valley is located within two watershed management organizations (WMOs): the Vermillion River Watershed Joint Powers Organization (VRWJPO) and the Black Dog Watershed Management Organization (BDWMO) (see Figure 2-2). Within their respective jurisdictions, each WMO performs roles and responsibilities in accordance with the authority specified in Minnesota Statutes 103B. This section summarizes the role of each WMO within the city Black Dog Watershed Management Organization The Black Dog Watershed Management Organization (BDWMO) is a joint powers organization including the cities of Apple Valley, Burnsville, Eagan, and Lakeville. As a joint powers organization, the BDWMO relies on its member cities to achieve the BDWMO vision: Water resources and related ecosystems are managed to sustain their long-term health and aesthetic beauty in order to contribute to the well-being of the citizens within the watershed. The relationship between the BDWMO and its member cities, including Apple Valley, is defined in part according to the BDWMO s guiding principles: Keep regulation at the local level the BDWMO will not administer a permit program. Assist member communities with intercommunity floodplain and runoff planning and with mediation of water management disputes between communities. Monitor, classify and manage strategic water resources to meet their intended use. Strategic resources are waterbodies that have broad watershed significance. Monitor, evaluate and/or model stormwater runoff quality. Improve the quality of the stormwater runoff reaching the Minnesota River. Manage intercommunity stormwater runoff, flooding and other water quantity issues. Develop policies to be implemented by the cities to protect the BDWMO s water resources. Assess performance of the BDWMO and the member cities toward achieving the goals stated in this plan. Provide member cities with useful information about the BDWMO, its activities, and water resource management. Educate all watershed citizens and member cities in water resource issues and BDWMO activities. 6-4

73 Assist member cities with funding water quality projects through grants and other funding available directly to watershed organizations. The BDWMO s 2012 Watershed Management Plan (BDWMO Plan) identifies roles and responsibilities for the BDWMO and its member cities among its policies (Section 4 of the BDWMO Plan). Key among these policies is the requirement that cities maintain a project review and permitting program with performance standards at least as stringent as those maintained by the BDWMO (and included in Section 4.9 of the BDWMO Plan). The City of Apple Valley has developed this SWMP with the intent to be consistent with the policies, requirements, and performance standards included in the BDWMO Plan. The BDWMO Plan identifies five waterbodies as strategic waterbodies, including two within Apple Valley. The BDWMO will classify, set action levels, monitor water quality, and track water quality trends for all strategic water resources, and will implement in-lake internal load reduction projects (e.g., alum treatment) as needed for those strategic water resources with intercommunity tributary watersheds, or as requested by the involved cities. Strategic waterbodies within or adjacent to the City of Apple Valley include: Keller Lake Lac Lavon The BDWMO will recommend actions for strategic waterbodies as necessary. Diagnostic-feasibility studies will be used to determine the needed water quality improvement projects and the estimated costs of the projects. The BDWMO will involve the cities in the decision-making process, taking into account cost effectiveness and the cities financial capability to fund water quality improvement projects. Member cities will perform the actions or projects recommended by the BDWMO. The BDWMO will continue to cooperate with the member cities to resolve issues related to implementing BDWMO-directed or TMDLrecommended water quality improvement projects. The BDWMO s involvement could include assisting in allocating project costs among the member cities, participating in public informational meetings about the projects, and obtaining grants. In accordance with the joint powers agreement, any member city may appeal cost allocation decisions made by the BDWMO. The BDWMO reviews local water management plans for consistency with the BDWMO Plan per the authorities listed in Minnesota Statutes 103B. BDWMO requirements for local plans in addition to those specified in Minnesota Rules 8410, are identified in Section of the BDWMO Plan. The City of Apple Valley has developed this SWMP with the intent to be consistent with the policies, requirements, and performance standards included in the BDWMO Plan and all applicable state rules. The BDWMO will work with member cities to set reasonably attainable goals and measurable expectations and to assess the BDWMO s and each city s progress toward the agreed upon expectations. The BDWMO expects the member cities to continue to share information with the BDWMO regarding monitoring and surveying of strategic waterbodies or MDNR public waters within the BDWMO and any management actions or projects performed for those waterbodies so that this information can be included in the BDWMO s annual report. 6-5

74 Additional information, including the BDWMO implementation program and 2012 Watershed Management Plan, is available from the BDWMO website at: Vermillion River Watershed Joint Powers Organization The Vermillion River Watershed Joint Powers Organization (VRWJPO) was formed through a joint powers agreement between Dakota and Scott counties in September The mission of the VRWJPO, adopted in May 2015, is to: Collaboratively providing education, science, and support to restore and protect the Vermillion River Watershed s natural resources for all who live, work, and play within its boundaries. To guide the VRWJPO in pursuit of its mission, the VRWJPO developed and adopted its Vermillion River Watershed Management Plan (VRWJPO Plan). Development of the VRWJPO included substantial stakeholder engagement to identify and prioritize issues within the watershed (Section 5 of the VRWJPO Plan). To address these issues, the VRWJPO Plan includes the following goals: A. Protect or restore water quality in lakes, streams, and wetlands. B. Protect and restore groundwater quality. C. Maintain a sustainable water supply. D. Address more intense fluctuations (up and down) in river flow rate and volume. E. Improve public awareness and stewardship of water resources. F. Improve watershed resilience to changing precipitation and temperature patterns. G. Protect or restore sensitive biological resources, such as plants, fish, insects, and wildlife. Section 6 of the VRWJPO Plan includes objectives and actions to achieve the above goals. Many of these objectives and actions include collaborative efforts between the VRWJPO and other units of government, including Apple Valley. Prominent among these are efforts to improve or maintain water quality. The VRWJPO also collaborates with municipalities to: Provide cost-share grants to cities and residents to implement water quality improvement projects Provide assistance to cities in meeting MS4 permit requirements Reduce barriers to implementing resource conservation practices Promote civic engagement and citizen-based action on water and natural resources issues The VRWJPO has established performance standards for activities meeting specific triggers (VRWJPO Standards, 2016, as amended). The VRWJPO does not currently implement a permitting program within the City of Apple Valley but does review projects meeting certain criteria. The VRWJPO also requires member cities to maintain and implement project review and permitting programs with performance standards at least as stringent as those defined in the VRWJPO Standards (2016, as amended). The City of Apple Valley developed this SWMP with the intent to be consistent with the VRWJPO Plan and VRWJPO Standards. 6-6

75 As part of the VRWJPO Plan, the VRWJPO has established a ten year implementation plan; the implementation plan is subdivided into management plans for each of the VRWJPO s major subwatersheds. In addition to collaborative, watershed-wide activities, the North Creek Subwatershed Management Plan identifies the following projects that may possibly be located within the city: Stormwater storage in the headwaters of North Creek Assess weirs/dams and backwaters Stormwater retrofits near Pilot Knob Road Consistent with Minnesota Statutes 103B, the VRWJPO reviews local water management plans for consistency with the VRWJPO Plan. Along with Minnesota Rules 8410, Figure of the VRWJPO Plan identifies requirements for local plans. Additional information about the VRWJPO, including the VRWJPO Plan and Standards, is available from the VRWJPO website at: Education and Public Involvement Program Education and public involvement serve an important role in enabling the City of Apple Valley to implement its water resource management programs. The City s education and public involvement program is closely tied with the City s implementation of its NPDES MS4 permit (minimum control measures 1 and 2, specifically) and was designed to be in conformance with the City s NPDES MS4 permit. Generally, the goal of the City s education program is to promote stewardship of water and environmental resources through education, public involvement, and cooperation (see Section 5.1). To achieve this goal, the City performs various education and communication activities. These activities are tailored to a range of target audiences, including: City staff Residents Development community City Staff This SWMP discusses many water resource management issues over which the City has varying levels of responsibility to address. Implementation of this SWMP impacts multiple City departments and personnel. Municipal staff involved with the implementation of the SWMP will have a wide range of tasks and responsibilities, including, but not limited to: Implementing stormwater management system maintenance Planning for and managing projects to improve water quality, address flooding issues, etc. Administering regulatory programs (e.g., WCA) Reviewing proposed projects for consistency with City performance standards Working out cooperative arrangements with regulatory and non-regulatory entities (e.g., WMOs) 6-7

76 Assisting the City Council in the application of the SWMP policies to issues under review by the Council City staff must have a basic understanding of the SWMP content in order to effectively carry out the above tasks. Methods to educate this target audience (City staff) include presentations at staff meetings, coverage in internal newsletters, issuance of internal memos, and maintenance of the City s website (which contains this SWMP and other relevant documents) Residents City residents and business owners are a vital group to reach for the successful implementation of this SWMP. The residents who live in the city, as well as those who do business within the city, are significantly affected by the resources managed under this plan. It is important to educate, and involve, residents and business owners to maintain political and economic support necessary to implement the SWMP. Education efforts targeting residents seek to increase awareness and understanding of stormwater impacts and the City s approach to managing surface water. Public expectations and perceptions for water body use and quality may differ from the classification system and management criteria in the SWMP. Communicating the City s role and responsibilities with respect to these issues is important to manage residents expectations. By providing information about the impacts of human activity on water resources, the City may discourage behaviors with negative consequences while developing community capacity for best management practices to positively impact water resources. To promote appropriate watershed stewardship, the City develops and/or distributes articles and information about, but not limited to, the following topics: management of invasive species water conservation and reuse non-point source pollution illicit discharges erosion control vegetated buffers and shoreline management local agency contacts stormwater website links composting and pollution prevention cost share program for native plants, rain gardens, or shoreland buffer enhancements The City communicates this information through a variety of media and activities, including: Workshops Presentations Catch basin stenciling and door hanger distribution Newsletters and targeted mailings Social media 6-8

77 Informational booth at public events Brochures at City Facilities City website: The City also works collaboratively with the Dakota County Soil & Water Conservation District (Dakota SWCD), the Black Dog Watershed Management Organization (BDWMO), Dakota County, and the Vermillion River Watershed Joint Powers Organization (VRWJPO) in distributing educational materials and promoting/supporting outreach programs. These activities may include, but are not limited to: Landscaping for Clean Water workshops (Dakota SWCD), Citizen Assisted Lake Monitoring Program (Metropolitan Council), Wetland Health Evaluation Program (Dakota County), The City s website is a principal component of its education and public involvement program. The City s website provides pages and links devoted to water resource related issues. The City website contains relevant City management documents (e.g., this SWMP), links to other agencies and technical resources, and local contact information for residents to request further information on specific stormwater topics or to report a stormwater related infraction. The City s website is located at: The City hosts an annual public opportunity to distribute educational materials and present an overview of the MS4 program and the City s SWPPP. Oral and written statements are received and considered for inclusion in the SWPPP by City staff. The City will periodically review its educational programs to keep this communication up to date and useful Development Community The development community is also a target audience for stormwater education. Development and redevelopment activities may have a substantial impact on runoff quality and downstream water bodies during and after construction. Making developers and their consulting engineers aware of City requirements for land-disturbing activities is an important component of the education program. In addition to a basic understanding of the overall SWMP policies (and corresponding City regulatory controls), the development community will need a good understanding of the reasons behind those policies. Developers and consultants should understand the impact of development on water quality and the value of appropriate BMPs. It is also necessary to ensure that developers and consultants understand the economic and social value of maintaining high water quality. The City communicates this information to developers through the site plan review process. Items reviewed may contain, among other things, the pertinent policies and mitigation requirements impacting development, basic information on the erosion control and best management practices required by the City, and stormwater control-related requirements for new and redevelopment projects and guidance for meeting those requirements. 6-9

78 6.5 Funding Considerations Several funding sources are available to the City of Apply Valley to implement this SWMP. These funding mechanisms are described in the following sections and include: Stormwater Utility Fee Area Connection Charges Special Assessments/Stormwater Taxing Districts Grants and Cost-shares Water Quality Cash Dedications The City s current funding mechanisms provide adequate funding to implement the City s stormwater and surface water management programs. In the future, the City will be challenged with needing to replace existing stormwater infrastructure that is at or beyond the end of its design life. Funding for capital improvements within the trunk storm sewer system which serve the older portions of the city may require modifications to current funding mechanisms Stormwater Utility Fee The stormwater utility fee is a fee charged to existing properties that generate runoff discharged to the City s stormwater system. The revenues collected are dedicated to the surface water system and are frequently used to pay for operation and maintenance of the system. The City intends for the stormwater utility to be the primary source of funding for implementing this SWMP. The City established its stormwater utility fee collection program in The stormwater utility fee provides funding to improve lake water quality through management plans and implementation of improvements. The funds are also used to improve and/or repair the storm sewer system, and for maintenance of water quality ponds. This program is periodically reviewed to determine its adequacy for funding the projects and programs needed Area Connection Charges Area connection charges are fees charged to developments on an area (cost per acre) and/or connection (cost per unit) basis. The City uses these charges to ensure that new development pays for the facilities required to serve it. Area charges vary according to the planned land use, with higher rates applied to land uses with greater percentages of impervious area (and thus generating more runoff). The City periodically reviews this funding mechanism and updates charges to account for inflation and other market forces Special Assessments (Minnesota Statutes 429) Per the authority given in Minnesota Statutes 429, Cities may assess benefiting or responsible properties to finance surface water improvements. The City of Apple Valley has used this authority to establish storm sewer improvement taxing districts (see City Ordinance Title V Chapter 52). These districts cover specific geographic areas the City has determined are in need of, and would benefit from, certain storm sewer improvements and ongoing maintenance activities. 6-10

79 Assessment rates for commercial, industrial, and high density residential areas are higher than for low density residential areas. The higher rate is justified because these areas typically have a larger percentage of roofed and paved areas, which increase the amount of runoff. The velocity of runoff on impervious surfaces is also greater, which results in lower times of concentration, higher peak runoff rates, and larger required storm sewer pipe. The assessment rate for these higher density land uses have been scaled up relative to an equivalent single family residential acre based on the ratio of their 10-year runoff coefficient Grants and Cost-share Opportunities Though subject to budgetary constraints, a number of state and other grant programs are available for surface water management activities. Many grant programs can change frequently in their objectives, the amount of funding available and what the funding can be used for. Cost-sharing opportunities may also reduce the portion of project or program costs carried by the City. There may be opportunities to jointly implement projects in cooperation with neighboring cities, Dakota County, the Dakota SWCD, BDWMO, or VRWJPO. The City periodically reviews its implementation program to identify projects and activities that may be candidates for grants or cost share opportunities; the City pursues these opportunities strategically Water Quality Cash Dedication In some situations, it may be advantageous for the City to collect cash dedication from development or redevelopment to be spent on regional or off-site water quality treatment rather than implementing onsite water quality treatment. The following is intended to better define under what conditions the City can collect a cash dedication and how it is calculated: 1. The City has the discretion of requiring water quality cash dedication for all or a portion of the pollutant removal targets for total phosphorus and total suspended solids. In exercising its discretion, the City will consider such factors as: topographic suitability of the site for water quality treatment features; the size of the site; the location of the site relative to sensitive resources or system components that require protection; whether public improvements have been or will be made off-site for the expressed purpose of mitigating the water quality impacts of the development; and the extent to which the development has paid for mitigation already for the site. 2. The amount of the cash dedication will be based on the size of a hypothetical treatment pond with a wet volume sufficient to contain the runoff from a 2.5-inch rainfall event from the project. The design of the hypothetical pond shall meet the pond design standards in Appendix E. 6-11

80 3. For redevelopment projects, when the impervious area on the site is increased by more than 0.2 acres, the cash dedication will be determined as if the original condition of the site was undeveloped. The purpose of this standard is to discourage increases in impervious coverage for redevelopment projects. 4. The City Council will periodically review and adopt the following: unit land area price for each general type of land use, unit pond volume price, appurtenance price The sum of all three components will be the total cash dedication for the project. The appurtenance price is 20% of the sum of the land area price and pond volume price, up to a maximum determined by the City Council. 5. Cost per acre of calculated wet pond surface area varies according to land use type: Single Family Residential Multi-Family Residential Industrial Commercial 6. The proceeds from the cash dedication will be ear-marked exclusively to finance water quality and wetland management improvements in the City. Additional information about the calculation of water quality cash dedication amounts is included in Appendix F 6.6 Ordinances, Design Standards, and Official Controls The City of Apple Valley regulates the management of stormwater through this SWMP, City ordinances and other applicable regulatory programs. These are collectively referred to as official controls, and include the following: City Code Title V: Public Works, including: o Water and sewers (Chapter 51) o Storm sewers (Chapter 52) City Code Title IX: General Provisions, including: o Public Nuisances (Chapter 94) City Code Title XV: Land Usage, including: o Natural Resource Management Plan (Chapter 152), addressing: Permits and Plans Forestry and tree preservation Storm and surface water regulations Wetland conservation regulations and buffers o Subdivision Controls (Chapter 153) 6-12

81 o Zoning (Chapter 155), addressing: Shoreland District Natural Features o Floodplain Control (Chapter 156) Wellhead Protection Plan Note that the official controls implemented by the City do not replace applicable permit requirements or performance standards imposed by the MPCA, BDWMO, VRWJPO, or other regulatory entities, as applicable. Projects with land-disturbing activity of one acre or more must also obtain a National Pollution Discharge Elimination System (NPDES) permit from the MPCA. The City requires various permits and/or approvals for land-disturbing projects (including developments), depending on the type of project. Per the City s zoning code (City Code Title XV, Chapter 155), the City requires an approved Drainage Plan for any new development or redevelopment activity. In addition, the City requires an approved Natural Resource Management Plan (City Code Title XV, Chapter 152) for activities meeting specific criteria. The City of Apple Valley acts as the Local Governmental Unit (LGU) responsible for administering the Wetland Conservation Act (WCA). This includes requiring and verifying that all projects impacting wetlands meet the requirements of the Minnesota WCA and applicable City wetland management guidance (see Appendix B). The City also actively works with the BDWMO and the VRWJPO toward accomplishing common goals and adhering to the policies of these watershed organizations. As part of the implementation of this SWMP the City will revise, as necessary, City ordinances, procedures, and policies, as needed, to remain consistent with the requirements of these WMOs. 6.7 Capital Improvements and Implementation Priorities The projects, programs, and activities related to the City s surface water and stormwater management responsibilities are summarized in Table 6-1 and Table 6-2. Many of the implementation items listed in Table 6-1 and Table 6-2 are required per the City s NPDES MS4 permit and incorporated into the City s SWPPP. These tasks will be addressed per the schedule presented in the SWPPP. Projects and programs to address TMDLs are included in Table 6-1 and Table 6-2 and are also described in Section Capital improvements planned for implementation within the life of this SWMP are included in Table 6-1. The City will continue to coordinate its stormwater capital improvements with the City s overall 10-year capital improvement plan (CIP). In addition to the 10-year CIP, the City will continue to follow its detailed 5-year CIP to schedule and plan for funding these projects in the near term (i.e., ). The City s overall CIP is updated annually by City staff and reviewed and approved annually by the City Council. The City carries out its implementation program with the intent to achieve the City s goals while promoting efficiency and minimizing cost. Therefore, the City will seek opportunities to coordinate stormwater system repair and/or replacement with its Pavement Management Program, redevelopment 6-13

82 opportunities, or other coordinated projects (e.g., park improvements, other utility upgrades). The City may also re-prioritize projects based on the availability of grant funding, cost-share opportunities, or availability of other funding sources that may reduce the City s financial responsibility. 6-14

83 Table Year Implementation Program Capital Improvements Estimated Expenses by Year ID Project Description Cost Estimate ($) 1 Proposed Funding Source P-1 Stormwater pond sediment removal $531,000 Stormwater utility P-2 Easement acquisition for stormwater facility maintenance P-3 Falcon Ridge rainwater garden improvements $500,000 Stormwater utility $20,000 Stormwater utility P-4 Briar Oaks Improvements $70,000 Stormwater utility P-5 Project Cobblestone $80,000 Stormwater Manor improvements (AL-P3 utility; grants subwatershed) P-6 Stormwater monitoring improvements (Keller Lake Watershed) P-7 Stormwater improvements coordinated with Surrey Trail/Cimarron Road Reconstruction P-8 Valley Middle Park subsurface improvements (KL-03 Keller Lake Watershed) P-9 Redwood Pond improvements (KL-10 Keller Lake Watershed) P-10 Project Sunset Pond improvements (AL-8 subwatershed) P-11 Erickson Park stormwater improvements (P-27 Long/Farquar retrofits) P-12 Whitney Pond improvements (KL-P2.1 Keller Lake watershed) $109,000 Stormwater utility $1,140,000 Stormwater utility $1,200,000 Stormwater utility; grants $500,000 Stormwater utility; grants $100,000 Stormwater utility; grants $290,000 2 Stormwater utility; grants $1,000,000 Stormwater utility; grants Notes $65,000 $50,000 $52,000 $52,000 $52,000 $260,000 Scout Pond planned for 2018 $50,000 $50,000 $50,000 $50,000 $50,000 $250,000 $20,000 $70,000 $80,000 Estimated $40,000 in grant funding; cooperative project with VRWJPO $69,000 $20,000 $20,000 $1,140,000 $1,200,000 Coordinated with BDWMO and VRWJPO Estimated $800,000 in grant funding $500,000 Estimated $115,000 in grant funding; cooperative project with BDWMO $100,000 $100,000 Estimated $50,000 in grant funding; cooperative project with VRWJPO $290,000 Estimated $130,000 in grant funding; cooperative project with VRWJPO $1,000,000 Estimated $500,000 in grant funding 6-15

84 ID Project Description P-13 Alimagnet Park/Edgewood & Reflection Rd improvements (Alimagnet retrofits) P-14 Regatta, JCR Park & City Hall Pond improvements (WVR priority projects) P-15 EVR-P7 & P55 outlet modifications/infiltration bench improvements (Long/Farquar retrofits) P-16 Greenleaf 6 th and 7 th Phase 1 Road Improvements P-17 Improvements to stormwater system performed in coordination with road improvements (Redwood, Park, Juniper) P-18 Greening Park Pond improvements (Keller Lake watershed) P-19 Duchess Park bioretention basin improvements (Keller Lake watershed) P-20 Holyoke Pond & AL-P2.2 improvements (Alimagnet retrofits) Cost Estimate ($) 1 Proposed Funding Source $30,000 Stormwater utility $300,000 2 Stormwater utility; grants $164,000 2 Stormwater utility; grants $200,000 Stormwater utility $400,000 Stormwater utility $420,000 Stormwater utility; grants $396,000 Stormwater utility; grants $600,000 Stormwater utility; grants P-21 WVR priority projects $150,000 Stormwater utility; grants P-22 Greenleaf 6 th and 7 th Phase 2 Road Improvements Estimated Expenses by Year Notes $30,000 Cooperative project with VRWJPO $300,000 Estimated $150,000 in grant funding; cooperative project with VRWJPO $164,000 Estimated $82,000 in grant funding; cooperative project with VRWJPO $200,000 Cooperative project with VRWJPO $400,000 $420,000 Estimated $210,000 in grant funding $396,000 Estimated $198,000 in grant funding; cooperative project with VRWJPO $600,000 Estimated $300,000 in grant funding; cooperative project with VRWJPO $150,000 Estimated $150,000 in grant funding; cooperative project with VRWJPO $200,000 $200,000 Cooperative project with VRWJPO 6-16

85 ID Project Description P-23 Improvements to stormwater system performed in coordination with road improvements (Pinewood, Walnut) P-24 Future improvements to existing stormwater system performed in coordination with street reconstruction: P-25 Chemical treatment of internal phosphorus load in Long Lake P-26 Implement projects to address priority flood risk issues identified by City-wide H&H model results P-27 Implement stormwater pond retrofits to improve water quality performance, including areas identified in TMDL studies P-28 Stormwater storage in the headwaters of North Creek (VRWJPO North Creek Subwatershed) P-29 Stormwater retrofits near Johnny Cake Ridge Road (VRWJPO North Creek Subwatershed) Cost Estimate ($) 1 Proposed Funding Source Estimated Expenses by Year $301,000 $301,000 $1,000,000 Stormwater utility $50,000 Stormwater utility; grants; assessments $800,000 Stormwater utility; grants; WMO costshare $500,000 Stormwater utility; grants; WMO costshare (1) Total cost for the period , represented in 2018 dollars. (2) Funded in total or in part by VRWJPO Notes $1,000,000 Projects through 2022 are identified in other tasks $50,000 If needed following watershed treatment; based on TMDL implementation plan $100,000 $100,000 $100,000 $500,000 Priority list to be based on results of water quality modeling and feasibility studies; see Table 6-2 $500,000 Priority list to be based on results of water quality modeling and feasibility studies; see Table 6-2 NA 2 VRWJPO From VRWJPO Plan North Creek Subwatershed 600,000 2 VRWJPO $600,000 Estimated $100,000 in grant funding; cooperative project with VRWJPO 6-17

86 Table 6-2 Implementation Program Programs, Studies, and Official Controls ID Item Description S-1 Review City ordinances and update as necessary, addressing: - Stormwater runoff quality - Wetlands - Flood risk and rate control - Shoreland overlay S-2 Implement the City development review, permitting, and inspection program S-3 Perform education and public involvement activities per SWPPP S-4 Perform storm sewer system inspection and maintenance activities consistent with the City s SWPPP (e.g., pond cleanout, street sweeping) S-5 Develop priority list of water quantity issues to evaluate based on City-wide H&H model S-6 Develop feasibility studies to identify solutions to flooding issues identified by City-wide H&H model S-7 Develop Keller Lake Subwatershed Assessment S-8 Develop priority list for water quality retrofit projects based on results of City-wide water quality modeling S-9 Develop feasibility studies to identify solutions to water quality issues identified by City-wide WQ model S-10 Implement Lac Lavon water quality management plan programs, including activities to reduce the impact of aquatic invasive species S-11 Coordinate with the MPCA, BDWMO, and VRWJPO as necessary in the Cost Estimate ($) 1 Proposed Funding Source $40,000 Stormwater utility $500,000 Storm sewer area charge $200,000 Stormwater utility $5,000,000 Stormwater utility $10,000 Stormwater utility $200,000 Stormwater utility $10,000 Stormwater utility $20,000 Stormwater utility $100,000 Stormwater utility $100,000 Stormwater utility Estimated Expenses by Year Notes $20,000 $20,000 Update for consistency with policies in this SWMP, BDWMO, VRWJPO $50,000 $50,000 $50,000 $50,000 $50,000 $250,000 Addresses SWPPP MCMs 4 and 5 $20,000 $20,000 $20,000 $20,000 $20,000 $100,000 Addresses SWPPP MCM 1, 2 and 3; performed in coordination with WMOs $500,000 $500,000 $500,000 $500,000 $500,000 $2,500,000 Addresses SWPPP MCM 6 $10,000 $40,000 $40,000 $40,000 $40,000 $10,000 Started in 2017 $20,000 $40,000 $40,000 $40,000 $10,000 $10,000 $10,000 $10,000 $10,000 $50,000 $100,

87 ID Item Description development of TMDL and/or WRAPS studies and implementation plans, as needed S-12 Update the City SWMP ahead of 2030 comprehensive plan update (complete in 2028) S-13 Assess weirs and backwater areas within the VRWJPO drainage area S-14 Management of invasive plant species and rough fish in Long and Farquar Lakes Cost Estimate ($) 1 Proposed Funding Source $50,000 Stormwater utility Estimated Expenses by Year $50,000 NA 2 VRWJPO From VRWJPO Plan North Creek Subwatershed $150,000 Stormwater utility; Dakota County (1) Total cost for the period , represented in 2018 dollars. (2) Funded by VRWJPO. Notes $15,000 $15,000 $15,000 $15,000 $15,000 $75,000 Based on TMDL implementation plan 6-19

88 7.0 References Barr Engineering Co Technical Memorandum: 2014 Lac Lavon Habitat Monitoring. Prepared for the Black Dog Watershed Management Organization. Barr Engineering Co Technical Memorandum: 2015 Keller Lake Habitat Monitoring. Prepared for the Black Dog Watershed Management Organization. Barr Engineering Co Apple Valley Stormwater Modeling Methodology and Results. Prepared for the City of Apple Valley. Black Dog Watershed Management Organization (BDWMO) Crystal and Keller Lake Use Attainability Analysis, Diagnostic-Feasibility Study: Water Quality Issues and Potential Restorative Measures. Prepared by Barr Engineering Co. BDWMO Watershed Management Plan. Prepared by Barr Engineering Co. BDWMO BDWMO 2011 Annual Report. Bluewater Science Lake Management Plan for Lac Lavon, Dakota County, Minnesota. Bluewater Science and Bonestroo, Rosene, Anderlik, and Associates Lake Management Plan for Alimagnet Lake, Dakota County, Minnesota. City of Apple Valley. September, Surface Water Management Plan. Prepared by Bonestroo. Crane, Crane, J.L Source apportionment and distribution of polycyclic aromatic hydrocarbons, risk considerations, and management implications for urban stormwater pond sediments in Minnesota, USA. Arch. Environ. Contam. Toxicol. 66: Crane, J.L., K. Grosenheider, and C.B. Wilson Contamination of stormwater pond sediments by polycyclic aromatic hydrocarbons (PAHs) in Minnesota. The role of coal tar-based sealcoat products as a source of PAHs. Prepared for the MPCA. MPCA document # tdr-g1-07. ( Dakota County Parks Department Lebanon Hills Stormwater Management Plan. Prepared by Barr Engineering Co. Emmons and Olivier Resources, Inc. (EOR) Long and Farquar Lakes TMDL Implementation Plan Update. Prepared for the City of Apple Valley. Metropolitan Council Minnesota Urban Small Sites BMP Manual. Prepared by Barr Engineering Co. Metropolitan Council Water Resources Policy Plan. 7-1

89 Minnesota Biological Survey, Minnesota Department of Natural Resources Natural Communities and Rate Species Dakota County, Minnesota. Minnesota Climatology Working Group. State Climatology Office, Minnesota Department of Natural Resources Division of Ecological and Water Resources: Minnesota Department of Health. 2016, as amended. Evaluating Proposed Stormwater Infiltration Projects in Drinking Water Supply Management Areas. Minnesota Department of Natural Resources (MDNR) Lake Finder Website: MDNR Public Waters Inventory (PWI) Maps website: Minnesota Geological Survey (MGS) Geologic Atlas of Dakota County. Minnesota Pollution Control Agency (MPCA) Stormwater and Wetlands: Planning and Evaluation for Addressing Potential Impacts of Urban Stormwater and Snow-melt Runoff on Wetlands. MPCA Minnesota Statewide Mercury Total Maximum Daily Load. MPCA Long and Farquar Lakes TMDL. Prepared for the City of Apple Valley and MPCA by Bonestroo, in Partnership with the VRWJPO and Wenck. MPCA Crystal, Keller, and Lee Lakes Nutrient Impairment Total Maximum Daily Load Report and Earley Lake Water Quality Assessment. Prepared by Barr Engineering Co. MPCA. 2013, as amended. National Pollutant Discharge Elimination System (NPDES) General Construction Stormwater Permit. MPCA Vermillion River Watershed TMDL Report. Prepared by the MPCA, VRWJPO, and Wenck Associates, Inc. MPCA Guidance Manual for Assessing the Quality of Minnesota Surface Waters for Determination of Impairment: 305(b) Report and 303(d) List. MPCA Twin Cities Metropolitan Area Chloride Total Maximum Daily Load. MPCA Twin Cities Metropolitan Area Chloride Management Plan. MPCA Environmental Data Access website. Minnesota Stormwater Manual contributors Minnesota Stormwater Manual

90 Minnesota Stormwater Manual contributors MIDS calculator. National Oceanic and Atmospheric Administration NOAA Atlas 14 Precipitation-Frequency Atlas of the United States, Volume 8 Version 2.0: Midwestern States (Colorado, Iowa, Kansas, Michigan, Minnesota, Missouri, Nebraska, North Dakota, Oklahoma, South Dakota, Wisconsin). Natural Resources Conservation Service (NRCS) National Engineering Handbook, Hydrology Section 4. NRCS. 1983, as amended. Soil Survey of Dakota County, Minnesota: Soils data update: United States Fish and Wildlife Service Circular 39 Wetland Types of the United States. Vermillion River Watershed Joint Powers Organization (VRWJPO) Watershed Management Plan. VRWJPO Alimagnet Lake Subwatershed Assessment Report. Prepared by Wenck Associates, Inc. in cooperation with the VRWJPO, City of Apple Valley, and the City of Burnsville. 7-3

91 Appendices

92 Appendix A City of Apple Valley Storm Water Pollution Prevention Program (SWPPP)

93 1 SWPPP (Storm Water Pollution Prevention Program) City of Apple Valley Last Revision Date: MS4 Owner: Name: City of Apple Valley Mailing Address: 7100 West 147 th Street City: Apple Valley State: MN Zip Code: County: Dakota General Contact for Permit Compliance: Name of Responsible Official: Jessica Schaum Title: Natural Resources Coordinator County: Dakota Mailing Address: th Street West City: Apple Valley State: MN Zip Code: Telephone Number: Fax Number: Address: City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

94 2 City of Apple Valley SWPPP BMP Pages Table of Contents Minimum Control Measure 1. Public Education and Outreach Best Management Practice Page 1-1: Quarterly Newsletter : Stormwater Outreach Education/Presentations : Public Notice for Annual Stormwater Program Input Opportunity : City Website-Storm Water Information : Stormwater Brochures/Flyers : Pet Waste Signage in Parks : Apple Valley Today -Television Broadcast : Evaluate Additional Educational Material : Long and Farquar Lakes Direct Drainage Newsletter : Education Plan Implementation : Employee Training Program Public Involvement And Participation Best Management Practice 2-1: Storm Drain Stenciling Program : Lake Association Weed Control : Opportunities for Public Input : Storm Water Informational Booth : Citizen-Assisted Monitoring Program (CAMP) : Wetland Health Evaluation Program (WHEP) : Household Cleanup Day Illicit Discharge And Detection Best Management Practice 3-1: Spill Reduction for Municipal Operations : Septic System Maintenance Program : Nuisance Ordinance/Illegal Dumping : Illicit Discharge and Illicit Connection Ordinance and Enforcement : Storm Sewer Map : Illicit Discharge Inspection Program : Emergency Spill Response Program Construction Site Runoff Control Best Management Practice 4-1: Grading Pre-Construction Meeting : Esc Construction Site Signage : Esc Plan Requirement and Review Process : Minimum Esc BMPS : Erosion and Sediment Control Inspection and Enforcement Program : Erosion and Sediment Control Ordinance : Pond Maintenance Procedures for Developments City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

95 3 4-8: Construction Site Waste Control Issues Post-Construction Site Runoff Control Best Management Practice 5-1: Design and Construction Standards : Zoning Ordinance : Plan Review Procedures : Buffer Zone Requirements : Natural Resource Management Ordinance : Storm Water Management Plan : Sanitary Sewer Comprehensive Plan Updates : Detention/Retention : Infiltration : Filtration : Pipe Flow Energy Dissipaters : Sump Manholes and Sump Catchbasins : Long-Term Operation and Maintenance of the Stormsewer System Pollution Prevention/Good Housekeeping Best Management Practice 6-1: Pond And Outfall Inspection and Cleaning Procedure Program : Structural Pollution Control Device Inspection and Cleaning : Street Deicing Program : Fertilizer Application Program : Pesticide and Herbicide Control Program : Fleet and Building Maintenance Program : Hazardous Material Storage and Recycling Program : Municipal Street Sweeping Program : Sanitary Sewer Maintenance Program : Municipal Turf Maintenance Program : Inspection Analysis and Frequency : Stockpile, Storage and Material Handling Program : Stormwater Treatment Effectiveness Assessment : Facilities Inventory Additional Bmp Requirements Best Management Practice 7-1: Discharge Affecting Source Water Protection Areas : Record Keeping and Reporting : Nondegradation : Response to Listing of Impaired Waters : Long and Farquar Lakes Nutrient TMDL : Crystal, Keller, and Lee Lakes TMDL : Vermillion River Watershed TMDL City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

96 4 MS4 Name: City of Apple Valley Unique Identifying Number: 1-1 Public Education and Outreach BMP Page Minimum Control Measures Addressed by This BMP X Public education & outreach X Construction site runoff controls X Public participation & involvement X Post-construction stormwater management X Illicit discharge detection & elimination X Pollution prevention/good housekeeping BMP Title: Quarterly Newsletter BMP Description: A quarterly newsletter is distributed to the public, which includes information regarding volunteer opportunities, proper lawn care practices, recycling opportunities, phone numbers to report illicit discharges or construction site ESC violations, and other stormwater educational material related to each minimum control measure during each year. Articles for posting are determined upon the needs of the City during that time of the year. Additional resources from outside entities will be used whenever warranted. Measurable Goals: Number of educational stormwater articles Number of times the newsletter is sent out to the public Timeline / Implementation Schedule: : Ongoing. Specific Components & Notes (optional): Responsible Party Name: Jessica Schaum Title: Natural Resources Coordinator Responsible Department Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) jschaum@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): Audience: General Public, Developers, Business Owners, Contractors. Educational goal: General public awareness and understanding of the storm water issues and volunteer opportunities. Activities: See BMP Description above Implementation Plans: See Timeline/Implementation Schedule above Performance Measures: See Measurable Goals above City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

97 5 MS4 Name: City of Apple Valley Unique Identifying Number: 1-2 BMP Page Minimum Control Measures Addressed by This BMP X Public education & outreach Construction site runoff controls Public participation & involvement Post-construction stormwater management X Illicit discharge detection & elimination Pollution prevention/good housekeeping BMP Title: Stormwater Outreach Education/Presentations BMP Description: The City will provide stormwater educational outreach activities such as presentations and partnerships with citizen groups to educate them on local water quality impacts due to urban runoff. The City will continue to encourage these opportunities by personal phone calls, newsletter publications, website postings or any other means available. Measurable Goals: Number of presentations conducted Number of partnership activities conducted Timeline / Implementation Schedule: : Currently implemented and will continue annually. Specific Components & Notes (optional): Storm drain stenciling (2-1) Responsible Party Name: Jessica Schaum Title: Natural Resources Coordinator Responsible Department Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) jschaum@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): Audience: General Public Educational goal: Give the general public awareness and understanding of the storm drain system Activities: See BMP Description above Implementation Plans: See Timeline/Implementation Schedule above Performance Measures: See Measurable Goals above City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

98 6 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 1-3 Minimum Control Measures Addressed by This BMP X Public education & outreach X Public participation & involvement Illicit discharge detection & elimination Construction site runoff controls Post-construction stormwater management Pollution prevention/good housekeeping BMP Title: Public Notice for Annual Stormwater Program Input Opportunity BMP Description: The City will post a 30-day public notice prior to the annual storm water meeting or event (2-3). The meeting or event will be posted on the website (1-4), City Hall bulletin board, and local newspaper and any additional location the City feels necessary to allow public knowledge of the meeting. Measurable Goals: Completed public notice requirement Number of locations notice is posted Specific Components & Notes (optional): Timeline / Implementation Schedule: : Annually post 30-day public notice for storm water public meeting : Annually post 30-day public notice for stormwater meeting or event Responsible Party Name: Jessica Schaum Title: Natural Resources Coordinator Responsible Department Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) jschaum@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): Audience: General Public, developers, business owners, and contractors. Educational goal: Give the audience awareness and knowledge of the stormwater meeting date, time, meeting process, and subject. Activities: See BMP Description above Implementation Plans: See Timeline/Implementation Schedule above Performance Measures: See Measurable Goals above City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

99 7 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 1-4 Minimum Control Measures Addressed by This BMP X Public education & outreach X Public participation & involvement X Illicit discharge detection & elimination X Construction site runoff controls X Post-construction stormwater management X Pollution prevention/good housekeeping BMP Title: City website Stormwater information BMP Description: City ordinances are currently available on-line for public viewing. The City plans to update any current storm water information on the website annually. Stormwater information is listed below within the specific components. Articles for posting are determined upon the needs of the City. Additional resources from outside entities will be used when warranted. At a minimum, the City will provide educational information and links related to education implementation plan. Measurable Goals: 2006: Active storm water information on website Updates to stormwater information on website Timeline / Implementation Schedule: 2006: Active storm water information on City website : Update web page with new information. Specific Components & Notes (optional): Recycling information Code of ordinance accessibility Volunteer groups and opportunities Construction site ESC BMPs Environmentally friendly lawn care practices Responsible Party Responsible Department Name: Jessica Schaum Title: Natural Resources Coordinator Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) jschaum@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): Audience: General Public, Business Owners, Developers, and Contractors. Educational goal: Give the audience awareness and understanding of the storm water issues, volunteer opportunities, contacts, and regulations. Activities: See BMP Description above Implementation Plans: See Timeline/Implementation Schedule above Performance Measures: See Measurable Goals above City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

100 8 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 1-5 Minimum Control Measures Addressed by This BMP X Public education & outreach X Public participation & involvement X Illicit discharge detection & elimination Construction site runoff controls Post-construction stormwater management Pollution prevention/good housekeeping BMP Title: Stormwater Brochures/Flyers BMP Description: A variety of storm water brochures are available at City Hall and the Central Maintenance Facility. Also, brochures are provided during events which the City participates to provide support and educational awareness during the year. The brochures provide educational material for proper lawn care practices and awareness of storm water issues. Periodically, the City will review additional information available from outside educational providers to replace or add additional educational brochures relevant to local issues related to urban runoff. Measurable Goals: Number of storm water brochures types distributed and available Number of places brochures are available Timeline / Implementation Schedule: : Brochures will be available at city buildings and city sponsored events annually. Specific Components & Notes (optional): Responsible Party Name: Jessica Schaum Title: Natural Resources Coordinator Responsible Department Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) jschaum@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): Audience: General Public, Business Owners, Developers, and Contractors. Educational goal: Provide the audience with alternative lawn care and individual storm water BMP information to increase awareness and knowledge. Activities: See BMP Description above Implementation Plans: See Timeline/Implementation Schedule above Performance Measures: See Measurable Goals above City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

101 9 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 1-6 Minimum Control Measures Addressed by This BMP X Public education & outreach Public participation & involvement X Illicit discharge detection & elimination Construction site runoff controls Post-construction stormwater management Pollution prevention/good housekeeping BMP Title: Pet waste signage in parks BMP Description: Pet waste signs, which inform the public of the city ordinance requiring proper cleanup of pet waste in public areas, are posted in certain parks within the City. Measurable Goals: Number of signs posted in parks Timeline / Implementation Schedule: Ongoing: Signs will be posted in problem areas, as they are needed. Specific Components & Notes (optional): Responsible Party Name: Tom Adamini Title: Park Maintenance Supervisor Responsible Department Department: Parks Dept. Head: Barry Bernstein Phone: (952) Phone: (952) tadamini@ci.apple-valley.mn.us bbernstein@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): Audience: General Public Educational goal: Public awareness of City regulation on pet waste management and penalties. Activities: See BMP Description above Implementation Plans: See Timeline/Implementation Schedule above Performance Measures: See Measurable Goals above City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

102 10 MS4 Name: City of Apple Valley Unique Identifying Number: 1-7 BMP Page Minimum Control Measures Addressed by This BMP X Public education & outreach X Construction site runoff controls X Public participation & involvement X Post-construction stormwater management X Illicit discharge detection & elimination Pollution prevention/good housekeeping BMP Title: Channel 16 Local Government Cable Television BMP Description: The City conducts television broadcasts of various public meetings. Additionally, the City will conduct an annual review of available stormwater related public service announcements (PSAs) available for broadcast and consider adding to cable programming. This BMP has become largely unavailable for use. Measurable Goals: Number of storm water related PSAs aired. Number of stormwater related segments aired. Timeline / Implementation Schedule: : Annually the City will conduct broadcasts pertaining to storm water issues. 2012: Sunset program Specific Components & Notes (optional): Responsible Party Name: Jessica Schaum Title: Natural Resources Coordinator Responsible Department Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) jschaum@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): Audience: Apple Valley Residents, Business Owners, Developers, and Contractors. Educational goal: Provide the audience with awareness and knowledge of storm water issues and city government decisions. Activities: See BMP Description above Implementation Plans: See Timeline/Implementation Schedule above Performance Measures: See Measurable Goals above City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

103 11 MS4 Name: City of Apple Valley Unique Identifying Number: 1-8 BMP Page Minimum Control Measures Addressed by This BMP x Public education & outreach x Construction site runoff controls x Public participation & involvement x Post-construction storm water management x Illicit discharge detection & elimination x Pollution prevention/good housekeeping BMP Title: Evaluate Additional Educational Materials BMP Description: The City will conduct an annual review research of relevant available educational storm water material, such as those listed within the Specific Components below, from outside entities, including, but not limited to: water conservation districts, watershed districts, watershed management organizations, school districts, University of MN extension and county, regional, state, and federal government. The City will also research materials (if available) to use for in-house training from these entities. The City currently coordinates with the agencies for implementing BMP 2-5 (Citizen-Assisted Monitoring Program) and 2-6 (Wetland Health Evaluation Program). Measurable Goals: Completed annual research for relevant available educational resources List of materials used from outside entities Attendance at professional organizational meetings Timeline / Implementation Schedule: : Continued Solicitation of storm water related materials from outside entities : Evaluate and edit material if necessary, identify audiences and define measurable goals : Develop new materials for use by City Specific Components & Notes (optional): Articles Newsletters Videos Brochures Special Packets Inserts and Displays In-house training documents Responsible Party for this BMP Responsible Department or Organization Name: Jessica Schaum Title: Natural Resources Coordinator Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) jschaum@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): Audience: General Public, Business Owners, Developers, and Contractors. Educational goal: To utilize relevant, available information from local and state programs for educating the audience. Activity: See BMP description above Implementation Plan: See Timeline/Implementation schedule above Performance Measures: See Measurable Goals above City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

104 12 MS4 Name: City of Apple Valley Unique Identifying Number: 1-9 BMP Page Minimum Control Measures Addressed by This BMP X Public education & outreach Construction site runoff controls Public participation & involvement X Post-construction stormwater management Illicit discharge detection & elimination Pollution prevention/good housekeeping BMP Title: Long and Farquar Lakes Direct Drainage Newsletter BMP Description: The City will annually mail out a newsletter to residents living within the direct drainages of Long and Farquar Lakes. The newsletter will contain information on the status of the lakes water quality, progress of implementation projects/tasks, and measures lakeshore homeowners can take to prevent pollution. Measurable Goals: Dates newsletters sent Newsletter final drafts Distribution list Timeline / Implementation Schedule: : Annually mail out newsletter 2016: Sunset program Specific Components & Notes (optional): Responsible Party Name: Jessica Schaum Title: Natural Resources Coordinator Responsible Department Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) jschaum@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

105 13 MS4 Name: City of Apple Valley Unique Identifying Number: 1-10 BMP Page Minimum Control Measures Addressed by This BMP x Public education & outreach x Construction site runoff controls x Public participation & involvement x Post-construction storm water management x Illicit discharge detection & elimination x Pollution prevention/good housekeeping BMP Title: Education Implementation Plan BMP Description: The City will track and review annually high priority stormwater issues, associated audiences, and measurable goals. IDDE reporting and recognition will be a component of the education program annually. Measurable Goals: Completed annual review of education implementation plan List of high priority stormwater issues IDDE reporting opportunities/avenues Timeline / Implementation Schedule: 2015: Develop implementation plan : Evaluate plan and edit high priority issues if necessary Specific Components & Notes (optional): Target audiences High priority stormwater issues IDDE recognition and reporting Partner organizations and programs Responsible Party for this BMP Responsible Department or Organization Name: Jessica Schaum Title: Natural Resources Coordinator Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) jschaum@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

106 14 MS4 Name: City of Apple Valley Unique Identifying Number: 1-11 BMP Page Minimum Control Measures Addressed by This BMP x Public education & outreach x Construction site runoff controls x Public participation & involvement x Post-construction storm water management x Illicit discharge detection & elimination x Pollution prevention/good housekeeping BMP Title: Employee Training Program BMP Description: The City will track and review annually groups of employees, to include temporary seasonal employees,that require stormwater training. Training will reflect job responsibilities, general water quality topics, and IDDE information. The Employee Training Program will be incorporated into the Education Implementation Plan. Measurable Goals: Completed annual review of education implementation plan List of identified employee groups and education topics that apply Training event/outlet tracking Timeline / Implementation Schedule: 2015: Update employee training program : Train employees per training program : Evaluate adequacy of program Specific Components & Notes (optional): Education Implementation Plan BMP 1-10 IDDE recognition and reporting Responsible Party for this BMP Responsible Department or Organization Name: Jessica Schaum Title: Natural Resources Coordinator Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) jschaum@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

107 15 Public Involvement and Participation BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 2-1 Minimum Control Measures Addressed by This BMP X Public education & outreach X Public participation & involvement X Illicit discharge detection & elimination Construction site runoff controls Post-construction stormwater management Pollution prevention/good housekeeping BMP Title: Storm Drain Stenciling Program BMP Description: The City provides material for volunteer storm drain stenciling. During the stenciling procedure, the volunteers also provide educational information to adjacent homes such as door hangers and/or brochures. Also, the City has established a standard for new catchbasins to include a stormwater logo during installation, which provides contractor and public education. Measurable Goals: Number of storm drains stenciled Number of castings installed with storm drain logos Timeline / Implementation Schedule: : Annual stenciling by volunteers and contractors Specific Components & Notes (optional): Volunteer stenciling Contractor installation of logo casting Responsible Party Name: Jessica Schaum Title: Natural Resources Coordinator Responsible Department Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) jschaum@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): Audience: Contractor and General Public Educational goal: Provide the public and contractor with participation and awareness regarding illicit discharge impacts to water quality. Activities: See BMP Description above Implementation Plans: See Timeline/Implementation Schedule above Performance Measures: See Measurable Goals above City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

108 16 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 2-2 Minimum Control Measures Addressed by This BMP Public education & outreach X Public participation & involvement Illicit discharge detection & elimination Construction site runoff controls X Post-construction stormwater management Pollution prevention/good housekeeping BMP Title: Lake Association Weed Control BMP Description: Lake associations participate in chemical and mechanical removal and control of exotic species. MnDNR permits are issued for approval of weed control techniques. Measurable Goals: Number of permits issued by DNR Number of lakes weed control took place Timeline / Implementation Schedule: : Aquatic invasive plant weed control 2015: Sunset program Specific Components & Notes (optional): Cutting/mowing control Chemical control Responsible Party Name: Jessica Schaum Title: Natural Resources Coordinator Responsible Department Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) jschaum@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): Audience: General Public Educational goal: Provides the lake associations the ability to get involved in maintaining the quality of water adjacent to their property. Activities: See BMP Description above Implementation Plans: See Timeline/Implementation Schedule above Performance Measures: See Measurable Goals above City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

109 17 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 2-3 Minimum Control Measures Addressed by This BMP X Public education & outreach X Public participation & involvement X Illicit discharge detection & elimination X Construction site runoff controls X Post-construction stormwater management X Pollution prevention/good housekeeping BMP Title: Opportunities for Public Input BMP Description: The City will conduct an annual storm water meeting or other event to allow the public to provide oral and written comments for changes to the SWPPP. The meeting or event will allow time to make necessary revisions to the SWPPP according to public comment. The City will accept comments from the public related to projects with erosion and sediment control or stormwater components and stormwater concerns. The City will develop a written procedure for accepting and addressing comments from the public Measurable Goals: Number of attendees/viewers of SWPPP Number of comments on the SWPPP Event description, date, and time Updates to written procedure for accepting public comment Public comments related to stormwater on permitted projects Timeline / Implementation Schedule: : A meeting or event will be conducted annually prior to submitting the annual report for the previous calendar year. 2015: Develop written procedure for accepting public input Specific Components & Notes (optional): 30-day public notice to comment on SWPPP Solicitation of comments on the SWPPP through website during spring Natural Resources booth and comment card for spring events for comments on the SWPPP Public meetings, notices, and hearings for new and updated ordinances, policies and plans affecting stormwater management Standalone meetings if other opportunities not available Written procedure for accepting public input on permitted projects Responsible Party Name: Jessica Schaum Title: Natural Resources Coordinator Responsible Department Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) jschaum@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): Audience: General Public, Business Owners, Developers, and Contractors Educational goal: Provide the public opportunity for oral and written statements City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

110 18 concerning the SWPPP. Activities: See BMP Description above Implementation Plans: See Timeline/Implementation Schedule above Performance Measures: See Measurable Goals above City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

111 19 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 2-4 Minimum Control Measures Addressed by This BMP X Public education & outreach X Public participation & involvement Illicit discharge detection & elimination Construction site runoff controls Post-construction stormwater management Pollution prevention/good housekeeping BMP Title: Storm Water Informational Booth BMP Description: The City displays a booth at public events throughout the community such as the Home and Garden Show each year. The booth includes recycling, yard care, and other storm water information for participants to increase their knowledge on storm water runoff. The City will display the booth at public events which allow or invite them. Measurable Goals: Number of events booth is displayed Number of different types of storm water informational material at booth. Timeline / Implementation Schedule: : Prepare booth and display annually at events within the community if participation is accepted by event coordinators Specific Components & Notes (optional): Storm water brochures and handouts Volunteer opportunities SWPPP comment opportunity for chosen events Responsible Party Responsible Department Name: Jessica Schaum Title: Natural Resources Coordinator Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) jschaum@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): Audience: General Public Educational goal: To provide the public with storm water education material and allow city staff to hear any concerns from residents. Activities: See BMP Description above Implementation Plans: See Timeline/Implementation Schedule above Performance Measures: See Measurable Goals above City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

112 20 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 2-5 Minimum Control Measures Addressed by This BMP X Public education & outreach X Public participation & involvement Illicit discharge detection & elimination Construction site runoff controls X Post-construction stormwater management Pollution prevention/good housekeeping BMP Title: Citizen-Assisted Monitoring Program (CAMP) BMP Description: The Citizen-Assisted Monitoring Program is a Metropolitan Council initiated program, which allows volunteers to collect surface water samples for analysis. The City pays for the program, gathers volunteers, and collects samples for analysis. Measurable Goals: Number of volunteers Number of lakes monitored Timeline / Implementation Schedule: : Continue monitoring lakes with CAMP program annually Specific Components & Notes (optional): Responsible Party Name: Jessica Schaum Title: Natural Resources Coordinator Responsible Department Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) jschaum@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): Audience: General Public Educational goal: To provide the public participation on water quality monitoring to increase public knowledge and awareness of impacts to local water bodies. Activities: See BMP Description above Implementation Plans: See Timeline/Implementation Schedule above Performance Measures: See Measurable Goals above City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

113 21 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 2-6 Minimum Control Measures Addressed by This BMP X Public education & outreach X Public participation & involvement Illicit discharge detection & elimination Construction site runoff controls X Post-construction stormwater management Pollution prevention/good housekeeping BMP Title: Wetland Health Evaluation Program (WHEP) BMP Description: WHEP is a Dakota County program, which the City participates. Volunteers are coordinated to collect and identify samples and document macroinvertibrate and macrophyte communities observed in a wetland. Measurable Goals: Number of volunteers Number of wetlands evaluated Timeline / Implementation Schedule: : Continue evaluating wetlands with WHEP program annually Specific Components & Notes (optional): Responsible Party Name: Jessica Schaum Title: Natural Resources Coordinator Responsible Department Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) jschaum@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): Audience: General Public Educational goal: To provide the public participation on wetland assessment and to increase public knowledge and awareness of impacts to local water bodies. Activities: See BMP Description above Implementation Plans: See Timeline/Implementation Schedule above Performance Measures: See Measurable Goals above City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

114 22 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 2-7 Minimum Control Measures Addressed by This BMP Public education & outreach X Public participation & involvement X Illicit discharge detection & elimination Construction site runoff controls Post-construction stormwater management Pollution prevention/good housekeeping BMP Title: Household Cleanup Day BMP Description: The City conducts a Household Cleanup Day to allow the public to dispose of tires, furniture, scrap metal, wood, and other non hazardous waste material. The material is taken by a licensed garbage hauler and disposed in a proper manner. Measurable Goals: Completed Household Cleanup Day Number of participants or loads Timeline / Implementation Schedule: : Complete Household Cleanup Day annually Specific Components & Notes (optional): Tires, furniture, scrap metal, wood, etc. Educational material to advertise Cleanup Day Responsible Party Responsible Department Name: Mandy Barnes Title: Records Technician Department: Community Development & Planning Dept. Head: Bruce Nordquist Phone: (952) Phone: (952) mbarnes@ci.apple-valley.mn.us bnordquist@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): Audience: General Public Educational goal: To provide the public a central location to bring non-hazardous material for proper disposal. Activities: See BMP Description above Implementation Plans: See Timeline/Implementation Schedule above Performance Measures: See Measurable Goals above City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

115 23 Illicit Discharge and Detection BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 3-1 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement X Illicit discharge detection & elimination Construction site runoff controls Post-construction stormwater management X Pollution prevention/good housekeeping BMP Title: Spill Reduction for Municipal Operations BMP Description: The City currently supplies spill clean-up kits in some vehicles and in select areas at the Central Maintenance Facility. Also, MSDS training for employees provides proper training on storage, handling, and disposing of hazardous waste material. The City will review the current program and implement any changes. Measurable Goals: Number of employees trained on program procedures Number of spills outside or in other areas draining to stormwater system Number of spills over 5 gallons in amount draining to the sanitary system Specific Components & Notes (optional): Spill kits in city fleet Floor dry Hazorb pillows MSDS training Timeline / Implementation Schedule: : Implemented changes to the program BMP 3-7 BMP 3-3 Designated storage and containers Written procedures for spill response Responsible Party Name: Dean Jacobson Title: Fleet Supervisor Responsible Department Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) djacobson@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): Audience: City staff Educational goal: The proper City staff is MSDS Right-to-Know trained. Activities: See BMP Description above Implementation Plans: See Timeline/Implementation Schedule above Performance Measures: See Measurable Goals above City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

116 24 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 3-2 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement X Illicit discharge detection & elimination Construction site runoff controls Post-construction stormwater management Pollution prevention/good housekeeping BMP Title: Septic System Maintenance Program BMP Description: Reminders are sent to 1/3 of the individual septic tank owners in the City. Recipients are required to send a report card back to the city signed by a certified septic tank inspector. Failures and inspections are documented. Measurable Goals: Number of septic systems inspected Number of reported system failures Number of letters sent Number of systems removed and connected to sanitary sewer collection system. Timeline / Implementation Schedule: Ongoing: Continue existing practice to address 1/3 of all septic tank owners in the City. Specific Components & Notes (optional): 1/3 inspected annually Letter sent to appropriate septic system owners for reminder Responsible Party Responsible Department Name: George Dorn Department: Public Works Title: Building Official Dept. Head: Matt Saam Phone: (952) Phone: (952) msaam@ci.apple-valley.mn.us gdorn@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): Audience: Individual septic system owners Educational goal: Letters sent to owners to remind them of the maintenance and inspection requirement of the City and County. Activities: See BMP Description above Implementation Plans: See Timeline/Implementation Schedule above Performance Measures: See Measurable Goals above City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

117 25 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 3-3 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement X Illicit discharge detection & elimination Construction site runoff controls Post-construction stormwater management Pollution prevention/good housekeeping BMP Title: Nuisance Ordinance/Illegal Dumping BMP Description: An ordinance stating illegal dumping of trash or debris on public or private property is currently included in the City Code of Ordinances. Measurable Goals: Completed nuisance ordinance Designation of illicit discharge priority inspection areas Timeline / Implementation Schedule: Ordinance complete : Review potential priority inspection areas Specific Components & Notes (optional): BMP 3-7 BMP 3-1 Written procedures for spill response Public Nuisance Ordinance Identification of illicit discharge priority inspection areas Responsible Party Responsible Department Name: Ben Pierson Title: Code Enforcement Officer Department: Community Development & Planning Dept. Head: Bruce Nordquist Phone: (952) Phone: (952) bpierson@ci.apple-valley.mn.us bnordquist@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

118 26 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 3-4 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement X Illicit discharge detection & elimination Construction site runoff controls Post-construction stormwater management Pollution prevention/good housekeeping BMP Title: Illicit Discharge and Illicit Connection Ordinance and Enforcement Ordinance BMP Description: Ordinance language includes prohibited discharges and connections to the storm sewer system and penalties for non-compliance. Measurable Goals: Updates to ordinance or policies if needed Designation of illicit discharge priority inspection areas Specific Components & Notes (optional): Public Nuisance ordinance BMP 3-3 Identification of illicit discharge priority inspection areas Responsible Party Name: Matt Saam Title: Public Works Director Timeline / Implementation Schedule: : Evaluate existing regulatory mechanisms : Updates to existing regulatory mechanisms if necessary : Review potential priority inspection areas Responsible Department Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) msaam@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

119 27 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 3-5 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement X Illicit discharge detection & elimination Construction site runoff controls Post-construction stormwater management X Pollution prevention/good housekeeping BMP Title: Storm Sewer Map BMP Description: The current storm sewer map is located in Computer Aided Drafting files and record plans. The City will incorporate the storm sewer into their GIS system. Measurable Goals: Updates to maps Specific Components & Notes (optional): GIS system identification Existing CAD drawings Existing record plans Responsible Party Name: Carol Blommel Johnson Title: Utility Superintendent Timeline / Implementation Schedule: 2006: Complete map of 60% of City storm sewer system 2007: Complete map of 80% of City storm sewer system June 30 th, 2008: Complete storm sewer map :Update map as needed Responsible Department Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) cblommel@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

120 28 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 3-6 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement X Illicit discharge detection & elimination Construction site runoff controls Post-construction stormwater management X Pollution prevention/good housekeeping BMP Title: Illicit Discharge/Connection Inspection Program BMP Description: The City will identify and document any dry weather flow when inspecting the outfalls, ponds, stockpiles and material handling areas, structural stormwater BMPs (including sumps),or reports from citizens. Dry weather flows not explained by local areas of groundwater intrusion, local irrigation, or lift station discharge will be further investigated for illicit discharges and connections. Measurable Goals: Number of illicit discharges and connections located as a result of applicable inspections Timeline / Implementation Schedule: 2015: Review applicable inspections programs to ensure IDDE inspections are incorporated : Inspect, document, investigate and enforce unexplained dry weather flows during applicable inspections Specific Components & Notes (optional): Pond and Outfall inspection and cleaning procedure program (6-1) BMP 6-12 BMP 3-4 BMP 3-3 BMP 6-2 Responsible Party Responsible Department Name: Jessica Schaum Department: Public Works Title: Natural Resources Coordinator Dept. Head: Matt Saam Phone: (952) Phone: (952) jschaum@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Name: Carol Blommel Johnson Title: Utilities Superintendent Phone: (952) cblommel@ci.apple-valley.mn.us Name: Mike Glewwe Title: Streets Superintendent Phone: (952) mglewwe@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): City website and other storm water educational brochures will educate citizens on impacts from illicit discharge and to report any violations to the City for enforcement actions. City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

121 29 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 3-7 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement X Illicit discharge detection & elimination Construction site runoff controls Post-construction stormwater management X Pollution prevention/good housekeeping BMP Title: Emergency Spill Response Program BMP Description: The City operates an Emergency Spill Response Program. The City will review the current program and implement any changes. Measurable Goals: Timeline / Implementation Schedule: Number of employees trained on program procedures 2015: Update Emergency Spill Response Program Number of spill incidents : Implement program Updates to program Specific Components & Notes (optional): BMP 3-7 BMP 3-1 Written procedures for spill response Wellhead Protection Plan Emergency Spill Response Program Responsible Party Responsible Department Name: Carol Blommel Johnson Department: Public Works Title: Utilities Superintendent Dept. Head: Matt Saam Phone: (952) Phone: (952) cblommel@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Name: Nealon Thompson Department: Fire Title: Fire Chief Dept. Head: Nealon Thompson Phone: Phone: nthompson@ci.apple-valley.mn.us nthompson@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): Audience: City staff Educational goal: The proper City staff emergency spill response trained. Activities: See BMP Description above Implementation Plans: See Timeline/Implementation Schedule above Performance Measures: See Measurable Goals above City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

122 30 Construction Site Runoff Control BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 4-1 Minimum Control Measures Addressed by This BMP X Public education & outreach Public participation & involvement Illicit discharge detection & elimination X Construction site runoff controls Post-construction stormwater management Pollution prevention/good housekeeping BMP Title: Grading Pre-construction Meetings BMP Description: Grading pre-construction meeting is conducted for development or redevelopment projects requiring a financial security greater than $2,000. The meeting intends to educate grading contractors on City ordinance regulations, standards, inspection, and enforcement procedures. Measurable Goals: Number of meetings held Number of attendees at meeting Timeline / Implementation Schedule: : Currently implemented and will continue as new projects are approved. Specific Components & Notes (optional): Responsible Party Name: Brandon Anderson Title: City Engineer Responsible Department Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) banderson@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): Audience: Contractors, Developers Educational goal: To provide audience with the awareness of city regulations and standards Activities: See BMP Description above Implementation Plans: See Timeline/Implementation Schedule above Performance Measures: See Measurable Goals above City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

123 31 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 4-2 Minimum Control Measures Addressed by This BMP X Public education & outreach X Public participation & involvement Illicit discharge detection & elimination X Construction site runoff controls Post-construction stormwater management Pollution prevention/good housekeeping BMP Title: Construction site ESC signage BMP Description: The City provides an ESC sign for the contractor to install at sitedetermined locations. The sign will provide a reference to the City s Natural Resource Management Ordinance (5-6) and a phone number for the public to report any violations. Measurable Goals: Number of permitted projects Specific Components & Notes (optional): Timeline / Implementation Schedule: : Signs will be distributed for each construction site project requiring a grading pre-construction meeting (4-1) : Signs will be distributed with NRMP Responsible Party Name: Jessica Schaum Title: Natural Resources Coordinator Responsible Department Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) jschaum@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): Audience: Contractor and General Public Educational goal: Provide the contractor and crew with awareness of the Natural Resources management ordinance. Also, provide the public a number to report violations and awareness of regulation and ESC program. Activities: See BMP Description above Implementation Plans: See Timeline/Implementation Schedule above Performance Measures: See Measurable Goals above City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

124 32 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 4-3 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement Illicit discharge detection & elimination X Construction site runoff controls Post-construction stormwater management Pollution prevention/good housekeeping BMP Title: Erosion and sedimentation control plan review process BMP Description: The City requires an Erosion and Sediment Control Component (ESCC) to be submitted during the Natural Resource Management plan review process. ESCC requires applicants to determine grading limits, identify permanent and temporary ESC best management practices, stockpile locations, and measures to ensure protection of water bodies and wetland zones according to city rules, regulations and policies. Measurable Goals: Number of plans reviewed Track updates to site plan review written procedure Timeline / Implementation Schedule: : This is an ongoing BMP. 2015: Develop site plan review written procedure Specific Components & Notes (optional): Site plan review written procedure Natural Resources Management Permit Responsible Party Responsible Department Name: Brandon Anderson Title: City Engineer Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) banderson@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

125 33 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 4-4 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement Illicit discharge detection & elimination X Construction site runoff controls Post-construction stormwater management Pollution prevention/good housekeeping BMP Title: Minimum Erosion and Sediment Control BMPs BMP Description: The City has minimum erosion and sedimentation control BMP requirements within the ordinance language. Erosion and sediment control plans are reviewed during the application process. Key elements of the approved plan and issues to watch for area discussed at grading and preconstruction meetings. Measurable Goals: Approved plans reviewed with contractors. Specific Components & Notes (optional): Erosion control silt fence Rock construction entrance Inlet protection devices Tree protection fence Street sweeping MPCA - NPDES Construction General Permit standard Responsible Party Name: Brandon Anderson Title: City Engineer Timeline / Implementation Schedule: : Provide review opportunities and copies of approved ESC plans at precon meetings Responsible Department Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) banderson@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): Grading pre-construction meeting will educate the contractor on the minimum requirements for construction within the City. City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

126 34 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 4-5 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement Illicit discharge detection & elimination X Construction site runoff controls Post-construction stormwater management Pollution prevention/good housekeeping BMP Title: Erosion and Sediment Control Inspection and Enforcement BMP Description: The City conducts erosion and sedimentation control inspection for projects equal to or greater than one acre. Procedures for enforcement include a warning letter and financial security to ensure proper installation and maintenance. Measurable Goals: Number of warnings issued Number of stop work orders issued Amount of financial security money taken for ESC noncompliance Track updates to inspection written procedures Designation inspection priority areas Specific Components & Notes (optional): Inspection schedule Warning letter Stop inspection Financial security Inspection written procedures Natural Resources Management Permit Timeline / Implementation Schedule: : Inspect projects 2015: Develop inspection written procedures : Review potential priority inspection areas Identification of ESC priority inspection areas Responsible Party Responsible Department Name: Jessica Schaum Title: Natural Resources Coordinator Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) jschaum@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): ESC signage for public education and phone number to report noncompliance. Grading pre-construction meeting to review permanent and temporary ESC BMPs for development or redevelopment. City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

127 35 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 4-6 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement Illicit discharge detection & elimination X Construction site runoff controls Post-construction stormwater management Pollution prevention/good housekeeping BMP Title: Erosion and Sedimentation Control Component (ESCC) Ordinance BMP Description: Chapter 152 within the City Natural Resources Management ordinance lists the requirements for construction site runoff control within the City. Each land disturbing activity greater than or equal to 1 acre, or smaller if part of a larger common development or sale equal to or greater than one acre, must obtain a Natural Resources Management Permit (NRMP) prior to activity on the site. The specific components of the ordinance are listed below. Measurable Goals: Completed ESC ordinance Specific Components & Notes (optional): Timeline / Implementation Schedule: : This is an existing ordinance and implementation is on-going. Specific components of the existing Natural Resources Management Ordinance include: 1. Requirements for an Erosion and Sediment Control Plan submittal by NRMP permits to review and approve or deny the erosion and sediment control and stormwater treatment BMPs, 2. Site plan review and approval by MS4 prior to activity on site, 3. Requirements and design standards for temporary erosion and sediment controls during construction activities, 4. Requirements for record keeping of rainfall amounts and inspections by site operators by reference to comply with the MPCA NPDES Construction General Permit, 5. Requirements and criteria for the proper site dewatering and/or basin draining. 6. Requirements and criteria for BMP maintenance, 7. Requirements concerning waste controls for solid and hazardous wastes, 8. Requirements and design standards for permanent stormwater management controls following the completion of construction activities, and 9. Requirements for stable slopes and the establishment of perennial vegetative cover on all exposed soils upon the completion of any construction activity Regulatory mechanisms identified in the ordinance include verbal warnings, written warnings, stop-work orders, fines, and forfeit of security bond money,. Responsible Party Responsible Department Name: Matt Saam Department: Public Works Title: Public Works Director Dept. Head: Matt Saam Phone: (952) Phone: (952) msaam@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

128 36 Educational components related to this BMP (description or number optional): ESC signage for public education and phone number to report noncompliance. Grading pre-construction meeting to review permanent and temporary ESC BMPs. Ordinance is available on the City website or City Hall City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

129 37 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 4-7 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement Illicit discharge detection & elimination X Construction site runoff controls X Post-construction stormwater management X Pollution prevention/good housekeeping BMP Title: Pond maintenance procedures for developments BMP Description: To ensure long-term maintenance of the numerous storm water ponds within the City during the construction period, financial securities are collected and ponds are inspected prior to City approval. After approval, the City establishes a right-of-entry to provide access for any required maintenance. Measurable Goals: Occurrences of financial security withdrawals for maintenance work on construction projects Timeline / Implementation Schedule: : Ongoing Specific Components & Notes (optional): Financial Security Responsible Party Responsible Department Name: Brandon Anderson Title: City Engineer Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) banderson@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

130 38 MS4 Name: City of Apple Valley BMP Page Unique Identifying Number: 4-8 Minimum Control Measures Addressed by This BMP Public education & outreach X Construction site runoff controls Public participation & involvement Post-construction stormwater management Illicit discharge detection & elimination Pollution prevention/good housekeeping BMP Title: Construction Site Waste Control Issues BMP Description: During the weekly erosion control inspections of construction sites, the City enforces the local nuisance ordinance which requires proper disposal of construction site waste. Additional requirements will be established within developers agreements or city ordinance if inspection results indicate a pattern of noncompliance. Measurable Goals: Number of enforcement actions related to construction site waste issues Timeline / Implementation Schedule: : Continue inspection of construction sites for proper waste management. Specific Components & Notes (optional): Construction waste, such as discarded building materials, concrete truck washout, chemicals, litter, and sanitary waste Financial security/letter of credit Penalties for noncompliance Inspection procedures Responsible Party Name: Jessica Schaum Title: Natural Resources Coordinator Responsible Department Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) jschaum@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): Construction site waste control issues will be discussed at pre-construction meeting to educate contractors of City requirements and standards. City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

131 39 Post-Construction Site Runoff Control BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 5-1 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement Illicit discharge detection & elimination X Construction site runoff controls X Post-construction stormwater management Pollution prevention/good housekeeping BMP Title: Design and Construction Standards BMP Description: For both temporary erosion and permanent runoff control, the City requires developments or redevelopments to identify and establish BMPs with the goal of reducing flooding, flow rate, and stormwater pollution. The City develops standards for design and construction to aid in development of its own infrastructure, updates to existing infrastructure, and review of private development infrastructure and practices. The standards the City develops are based on current best practices. The City will keep current on new and emerging trends, practices, and technologies and update standards when warranted. The City will track standards and design guides it develops or uses from outside sources. Measurable Goals: Timeline / Implementation Schedule: Number of permanent stormwater : Ongoing design standard BMPs designed and installed : Track revisions to Updates to guidance materials and standards standards and guidance materials Specific Components & Notes (optional): Minnesota Stormwater Manual Wiki City of Apple Valley Detail Plates City of Apple Valley General Specifications for Contractors Dakota County Low Impact Development Standards DCSWCD Apple Valley Surface Water Management Plan Responsible Party Responsible Department Name: Brandon Anderson Title: City Engineer Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) banderson@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

132 40 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 5-2 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement Illicit discharge detection & elimination Construction site runoff controls X Post-construction stormwater management Pollution prevention/good housekeeping BMP Title: Zoning Ordinance BMP Description: A zoning ordinance is completed in the City to regulate land use planning and establish design standards according to the City s Storm Water Management Plan and Comprehensive Plan. Measurable Goals: Number of revisions made to the zoning ordinance. Timeline / Implementation Schedule: : Additional revisions as needed Specific Components & Notes (optional): Responsible Party Name: Tom Lovelace Title: City Planner Responsible Department Department: Community Development & Planning Dept. Head: Bruce Nordquist Phone: (952) Phone: (952) tlovelace@ci.apple-valley.mn.us bnordquist@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): Ordinance is available on the City website or City Hall. City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

133 41 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 5-3 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement Illicit discharge detection & elimination Construction site runoff controls X Post-construction stormwater management Pollution prevention/good housekeeping BMP Title: Plan Review and Approval Procedures BMP Description: Plan review procedures are identified in City ordinances, which require submittal, review, and approval of required permit applications. Timelines for review are provided in the ordinance and guided by state requirements. Design standards are provided in City code, operational plans, City policies, and other design standards documents. The City uses this regulatory mechanism to ensure postconstruction runoff control compliance with the approved Surface Water Management Plan and NPDES MS4 General Permit. Project approval is contingent upon the execution of an agreement on the part of the property owner to maintain postconstruction stormwater management BMPs. This process includes procedures to assure coordination with appropriate agencies and to evaluate discharges which may adversely affect properties listed or eligible for listing in the National Register of Historic Places or affecting known or discovered archeological sites; or discharges whose direct, indirect, interrelated, interconnected, or independent impacts may jeopardize a listed endangered or threatened species or adversely modify a designated critical habitat. Measurable Goals: Number of plans reviewed Number of maintenance agreements entered into Updates to plan review written procedures Updates to review checklists Updates to maintenance agreement templates Specific Components & Notes (optional): BMP 5-1 Stormwater review checklists Stormwater review documentation Timeline / Implementation Schedule: : Ongoing 2015: Develop written procedures and checklists : Update operational plans BMP 7-1: Discharges Affecting Source Water Protection Areas Written procedure for post-construction stormwater management plan review Written procedure for construction site stormwater plan review City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

134 42 Responsible Party Name: Tom Lovelace Title: City Planner Responsible Department Department: Community Development & Planning Dept. Head: Bruce Nordquist Phone: (952) Phone: (952) Educational components related to this BMP (description or number optional): Ordinance is available on the City website or City Hall. City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

135 43 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 5-4 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement Illicit discharge detection & elimination Construction site runoff controls X Post-construction stormwater management Pollution prevention/good housekeeping BMP Title: Buffer Zone Requirements BMP Description: The City has required a 15 minimum buffer zone on all new construction property, public or private, which abuts any water body since Starting in 2008 minimum buffer widths and projects requiring a buffer will increase to meet the requirements of the updated SWMP. A financial security is retained to ensure proper installation and City approved plant species. Measurable Goals: Completed buffer zone ordinance Updates to ordinance Timeline / Implementation Schedule: : Ongoing : Track updates to requirements Specific Components & Notes (optional): Buffer width averaging Buffer width based on wetland functions and values rating for wetlands Buffers required for certain redevelopment projects Average widths of 16.5, 25, 30, 40, and 50 Responsible Party Name: Jessica Schaum Title: Natural Resources Coordinator Responsible Department Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) jschaum@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): Ordinance is available on the City website or City Hall. City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

136 44 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 5-5 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement Illicit discharge detection & elimination X Construction site runoff controls X Post-construction stormwater management Pollution prevention/good housekeeping BMP Title: Natural Resource Management Ordinance BMP Description: The Natural Resource Management ordinance provides protection and preservation of the City s natural resources by providing orderly development of land to minimize tree and land habitat loss. Also, mitigation for tree removals and environmental impacts are included in the ordinance language. Measurable Goals: Completed Natural Resource Management Ordinance Timeline / Implementation Schedule: Ongoing Specific Components & Notes (optional): Natural Resource Management Permit Erosion and Sedimentation Control Component (ESCC) Tree Preservation Component (TPC) Drainage and Grading Component (DGC) Tree Mitigation (TPPC) Wetland buffer zone requirement Responsible Party Responsible Department Name: Jessica Schaum Title: Natural Resources Coordinator Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) jschaum@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): Ordinance is available on the City website or City Hall. City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

137 45 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 5-6 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement Illicit discharge detection & elimination X Construction site runoff controls X Post-construction stormwater management Pollution prevention/good housekeeping BMP Title: Surface Water Management Plan (SWMP) BMP Description: The City developed a Surface Water Management Plan (SWMP) in 1997, which includes Goals and Policies, Watershed Requirements, Agency Requirements, Best Management Practices, watershed descriptions, storm water quality, and infrastructure improvement planning. The City is required to revise the plan every 10 years under Metro Surface Water Management Planning rules. Measurable Goals: Timeline / Implementation Schedule: Completed SWMP Ongoing plan Updates to SWMP implementation 10 year revisions to SWMP 2017: 10 year plan revision Specific Components & Notes (optional): Watershed drainage districts and subdistricts Design standards Cost estimate for new storm sewer infrastructure Goals and policies Compliance with requirements of local Watershed Management Organizations Wetland inventory and assessment Wetland standards and recommendations Priority lakes and classification Responsible Party Responsible Department Name: Jessica Schaum Title: Natural Resources Coordinator Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) jschaum@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

138 46 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 5-7 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement Illicit discharge detection & elimination Construction site runoff controls X Post-construction stormwater management Pollution prevention/good housekeeping BMP Title: Sanitary Sewer Comprehensive Plan Updates BMP Description: The current Sewer Comprehensive Plan allows the city to plan for future and orderly construction of sanitary sewer infrastructure and maintenance procedures. The City is required to revise the plan every 10 years. Measurable Goals: Updates to Sanitary Comprehensive Plan 10 year revisions to Sanitary Comprehensive Plan Timeline / Implementation Schedule: : Implement Sanitary Sewer Comprehensive Plan 2018: 10 year plan revision Specific Components & Notes (optional): Responsible Party Name: Carol Blommel Johnson Title: Utility Superintendent Responsible Department Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) cblommel@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.uss Educational components related to this BMP (description or number optional): City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

139 47 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 5-8 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement Illicit discharge detection & elimination Construction site runoff controls X Post-construction stormwater management Pollution prevention/good housekeeping BMP Title: Detention/Retention BMP Description: Both detention and retention storm sewer ponds are installed to control post-construction runoff within the City. The City will require this type of post construction BMP as site conditions allow. Measurable Goals: Number of detention and retention BMPs installed Timeline / Implementation Schedule: Ongoing Specific Components & Notes (optional): NURP standards Cool water discharge designs including infiltration techniques Responsible Party Responsible Department Name: Brandon Anderson Title: City Engineer Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) banderson@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

140 48 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 5-9 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement Illicit discharge detection & elimination Construction site runoff controls X Post-construction stormwater management Pollution prevention/good housekeeping BMP Title: Infiltration BMP Description: Infiltration BMPs are installed to control post-construction runoff within the City. The City will require this type of post construction BMP as site conditions allow. Measurable Goals: Number of infiltration BMPs installed Timeline / Implementation Schedule: Ongoing Specific Components & Notes (optional): Raingardens Responsible Party Name: Brandon Anderson Title: City Engineer Responsible Department Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) banderson@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

141 49 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 5-10 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement Illicit discharge detection & elimination Construction site runoff controls X Post-construction stormwater management Pollution prevention/good housekeeping BMP Title: Filtration BMP Description: Filtration BMPs are installed to control post-construction runoff within the City. The City will require this type of post construction BMP as site conditions allow. Measurable Goals: Number of filtration BMPs installed Timeline / Implementation Schedule: Ongoing Specific Components & Notes (optional): ½ rainfall filtration requirement for developments Infiltration storm manholes Raingardens Responsible Party Responsible Department Name: Brandon Anderson Title: City Engineer Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) banderson@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

142 50 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 5-11 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement Illicit discharge detection & elimination Construction site runoff controls X Post-construction stormwater management Pollution prevention/good housekeeping BMP Title: Pipe flow energy dissipaters BMP Description: Pipe flow energy dissipaters are installed to control postconstruction runoff within the City. The City will require this type of post construction BMP as site conditions allow. Measurable Goals: Number of pipe flow energy dissipaters installed Timeline / Implementation Schedule: Ongoing Specific Components & Notes (optional): Rip rap Concrete surge basins ¼ pipe size submerged Responsible Party Name: Brandon Anderson Title: City Engineer Responsible Department Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) banderson@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

143 51 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 5-12 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement Illicit discharge detection & elimination Construction site runoff controls X Post-construction stormwater management Pollution prevention/good housekeeping BMP Title: Sump manholes and sump catchbasins BMP Description: Sump manholes and sump catchbasins are installed to collect sediment and debris from both construction and post-construction runoff. The City will require this type of post construction BMP as site conditions allow. The City maintains the sumps according to an approved maintenance schedule (6-2). Measurable Goals: Number of sump manholes and sump catchbasins installed Timeline / Implementation Schedule: Ongoing Specific Components & Notes (optional): Storm Drainage system inspection and cleaning Responsible Party Responsible Department Name: Brandon Anderson Title: City Engineer Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) banderson@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

144 52 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 5-13 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement Illicit discharge detection & elimination Construction site runoff controls X Post-construction stormwater management X Pollution prevention/good housekeeping BMP Title: Long-Term Operation and Maintenance of the Stormwater System BMP Description: The City will operate and maintain publicly owned stormwater management facilities to ensure they continue serving their intended function to reduce the discharge of pollutants. Facility inspection and maintenance activities will be coordinated with Pond and outfall inspection and cleaning procedure program (6-1) and Structural pollution control device inspection and cleaning (6-2) BMP s. The City will strive to implement corrective measures for routine maintenance activities in the year of discovery with priority given based on condition of facility. Other non-routine maintenance measures will be placed on a list with priority given to projects that provide the most cost effective pollution reduction. The City has established a stormwater utility to pay for the continued cost of revising the SWPPP, stormwater program, and long-term maintenance of the storm sewer system. For private stormsewer infrastructure, the City includes provisions within developer s agreements for each project and may also require a separate maintenance agreement. These provisions include long term operation and maintenance requirements appropriate for the specific system. Measurable Goals: Number of repairs, replacements, or maintenance measures Number of employees trained for proper O & M Number of developers agreements established Number of maintenance agreements established Timeline / Implementation Schedule: 2006 Integrate inspection, operation, and maintenance activities with 6-1, and Implement corrective measures to the MEP and annually review procedures and revise as needed Specific Components & Notes (optional): Pond and outfall inspection and cleaning procedure program (BMP 6-1) Structural pollution control device inspection and cleaning (BMP 6-2) Responsible Party Name: Brandon Anderson Title: City Engineer Responsible Department Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) banderson@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

145 53 Pollution Prevention/Good Housekeeping BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 6-1 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement Illicit discharge detection & elimination Construction site runoff controls Post-construction stormwater management X Pollution prevention/good housekeeping BMP Title: Pond and outfall inspection and cleaning procedure program BMP Description: All Ponds and outfalls will be inspected at least once every five years. Pond maintenance prioritization will be based on inspection reports. Dry weather flows not explained by local areas of groundwater intrusion, local irrigation, or lift station discharge will be further investigated for illicit discharges and connections. Measurable Goals: Timeline / Implementation Schedule: Number of outfalls and ponds inspected : Inspect all outfalls and Number of outfalls full of sediment or ponds once every 5 years and document debris cleaning actions taken Number of employees trained on proper : Inspect, document, storm sewer system maintenance investigate and enforce unexplained dry Number of illicit discharges and weather flows during inspections connections located as a result of inspections Specific Components & Notes (optional): Outfall cleaning procedures and inspection schedule Pond cleaning procedures and inspection schedule GPS identification of inlet and outlet of pond Inspection and maintenance tracking software BMP 3-6 Responsible Party Responsible Department Name: Jessica Schaum Title: Natural Resources Coordinator Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) jschaum@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): Employee training City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

146 54 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 6-2 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement Illicit discharge detection & elimination Construction site runoff controls Post-construction stormwater management X Pollution prevention/good housekeeping BMP Title: Structural pollution control device inspection and cleaning BMP Description: The City will inspect 100% of the structural pollution control devices annually except sump manholes. Currently, the City has developed a sump manholecleaning schedule which includes biennial inspection and cleaning. To justify an appropriate maintenance schedule for sump manholes, the City will document the number cleaned and inspected as well as the number full of sediment or debris. A map will be developed to distinguish which devices have been cleaned and inspected annually. If maintenance actions are required for an individual manhole as a result of the first two inspections, the City will increase the number of inspections as required in the Permit. All other structural pollution control devices will be inspected annually and appropriate maintenance actions will be taken according to the inspections. Dry weather flows not explained by local areas of groundwater intrusion, local irrigation, or lift station discharge will be further investigated for illicit discharges and connections. Measurable Goals: Number of known structural pollution control devices and types Number of maintenance actions Number of sumps cleaned and inspected Number of sumps full of sediment or debris Number of employees trained Number of illicit discharges and connections located as a result of inspections and maintenance activities Specific Components & Notes (optional): Sump cleaning and inspection schedule BMP 3-6 Responsible Party Name: Carol Blommel Johnson Title: Utility Superintendent Timeline / Implementation Schedule: : Review inspection and maintenance records to adjust inspection and maintenance schedule if needed : Annual sump and structural pollution control devices inspection and cleaning : Inspect, document, investigate and enforce unexplained dry weather flows during inspections Responsible Department Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) cblommel@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): Employee training City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

147 55 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 6-3 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement Illicit discharge detection & elimination Construction site runoff controls Post-construction stormwater management X Pollution prevention/good housekeeping BMP Title: Street Deicing Program BMP Description: The street deicing program in the City includes training of new employees and an Annual Snowplow Meeting to review correct practices and issues related to street deicing. The City also has developed a Sensible Salt Program which determines the appropriate mixture of salt and/or salt mixtures road application according to the temperature, forecast, and road conditions. An enclosed building is used for salt storage, truck loading, and mixing. Certain salt applicator trucks are equipped with patrol commanders to determine application rate and temperature sensors to control salt/sand mix for application. Measurable Goals: Amount of salt applied to streets Amount of sand applied to streets Specific Components & Notes (optional): Sensible Salt Program Alternative salt products Salt brine tanks on trucks Annual Snowplow Meeting New employee training Salt storage building Patrol commander to control salt application Pavement temperature sensors Responsible Party Name: Mike Glewwe Title: Street Superintendent Timeline / Implementation Schedule: : Annually evaluate alternative products, equipment, and procedures Responsible Department Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) mglewwe@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): Employee training at Annual Snowplow Meeting City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

148 56 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 6-4 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement Illicit discharge detection & elimination Construction site runoff controls Post-construction stormwater management X Pollution prevention/good housekeeping BMP Title: Fertilizer Application Program BMP Description: The Parks Department applies fertilizer within the City. No phosphorus fertilizer will be used unless a soil test determines need. Employees are trained on proper handling, application, and cleanup procedures. Measurable Goals: Number of employees trained Amount of fertilizer applied Timeline / Implementation Schedule: Ongoing Specific Components & Notes (optional): No phosphorus fertilizer-2004; unless phosphorus is below a certain threshold Annual employee training Impervious surface cleaning Responsible Party Responsible Department Name: Tom Adamini Title: Parks Department: Parks Dept. Head: Barry Bernstein Phone: (952) Phone: (952) tadamini@ci.apple-valley.mn.us bbernstein@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): Annual employee training City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

149 57 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 6-5 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement Illicit discharge detection & elimination Construction site runoff controls Post-construction stormwater management X Pollution prevention/good housekeeping BMP Title: Pesticide and Herbicide Control Program BMP Description: The Parks Department applies pesticide and herbicide within the City. All employees who handle restricted pesticides are required to be licensed to ensure proper handling and application procedures. The City will evaluate the current program, make any appropriate changes, and document the procedures. Measurable Goals: Evaluate alternative pesticide and herbicide products, equipment, or procedures Number of licensed applicators on staff Amount of pesticide and herbicide applied Timeline / Implementation Schedule: : Continual education and training of employees that are going to be handling pesticides and herbicides. Specific Components & Notes (optional): Pesticide licensed applicators Proper handling and application Annual employee training Responsible Party Name: Tom Adamini Title: Parks Superintendent Responsible Department Department: Parks Dept. Head: Barry Bernstein Phone: (952) Phone: (952) tadamini@ci.apple-valley.mn.us bbernstein@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): Annual employee training City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

150 58 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 6-6 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement Illicit discharge detection & elimination Construction site runoff controls Post-construction stormwater management X Pollution prevention/good housekeeping BMP Title: Fleet and Building Maintenance Program BMP Description: The Fleet Maintenance Division of Public Works provides scheduled maintenance and safety checks on City vehicles. An inside wash bay is used to wash all vehicles. The City will evaluate the existing program and document all vehicle inspections and maintenance. Measurable Goals: Number of equipment maintained Number of employees trained Timeline / Implementation Schedule: : Continual fleet and building maintenance and documentation program Specific Components & Notes (optional): Scheduled maintenance Inside wash bay Fleet safety checks Spill kits/hazorb pillows in designated City buildings Designated storage area for chemicals or other hazardous waste Responsible Party Name: Dean Jacobson Title: Fleet Superintendent Responsible Department Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) djacobson@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): Employee training City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

151 59 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 6-7 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement Illicit discharge detection & elimination Construction site runoff controls Post-construction stormwater management X Pollution prevention/good housekeeping BMP Title: Hazardous Material Storage and Recycling Program BMP Description: The City recycles fluorescent light bulbs, floor dry, solvents, and anti-freeze and stores them in designated containers in a storage room. Also, reusable towels are used during fleet and building operation and maintenance in place of disposable to reduce waste. The City will also include an employee training component with this BMP to keep appropriate maintenance staff aware of city policies regarding proper storage, handling and recycling of hazardous materials. Measurable Goals: Document hazardous material storage and recycling program Timeline / Implementation Schedule: : Ongoing Specific Components & Notes (optional): Reusable towels Fluorescent bulb recycling Designated storage room/containers Floor dry recycling Oil and anti-freeze recycling Employee training Responsible Party Name: Dean Jacobson Title: Fleet Superintendent Responsible Department Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) djacobson@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

152 60 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 6-8 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement Illicit discharge detection & elimination Construction site runoff controls X Post-construction stormwater management X Pollution prevention/good housekeeping BMP Title: Municipal Street Sweeping Program BMP Description: City streets are swept twice each year and on an as-needed basis incorporating the use of a regenerative air sweeper. Streets are swept prior to flushing the water distribution system in the Spring and dense foliage areas are a priority during the Fall. City employees are trained each year at an annual meeting to discuss new policies, equipment, and procedures for the following year. The Long and Farquar Lakes direct drainages will receive a more intensive sweeping regime to help meet the TMDL specified WLA. The City will ensure that the direct drainages receive at minimum three rounds of sweeping. Timing will concentrate on picking up the fall leaf drop, winter debris accumulation, and spring/early summer seed drop. Portions of the Keller Lake direct drainage in the City of Apple Valley and under its operational control will receive a more intensive sweeping regime to help meet the TMDL specified WLA. The City will ensure that the direct drainages receive at minimum three rounds of sweeping. Timing will concentrate on picking up the fall leaf drop, winter debris accumulation, and spring/early summer seed drop. Portions of the Alimagnet Lake direct drainage in the City of Apple Valley and under its operational control will receive a more intensive sweeping regime to help meet the TMDL specified WLA. The City will ensure that the direct drainages receive at minimum three rounds of sweeping. Timing will concentrate on picking up the fall leaf drop, winter debris accumulation, and spring/early summer seed drop. Measurable Goals: Number of street miles swept Number of loads collected Number of loads collected from Long and Farquar direct drainage Number of loads collected from the Keller Lake direct drainage. Number of loads collected from the Alimagnet Lake direct drainage. Timeline / Implementation Schedule: : Evaluate current program and make necessary revisions : Ongoing program City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

153 61 Specific Components & Notes (optional): Bi-annual street sweeping (100% of the streets) Sweeping before water line flushing High canopy areas are priority in the fall Employee training Regenerative air sweeper (vacuum sweeper) Maps for areas of more intensive street sweeping Responsible Party Responsible Department Name: Mike Glewwe Title: Street Superintendent Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) Educational components related to this BMP (description or number optional): Annual employee training City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

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155 63 MS4 Name: City of Apple Valley Unique Identifying Number: 6-9 BMP Page Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement Illicit discharge detection & elimination Construction site runoff controls Post-construction stormwater management X Pollution prevention/good housekeeping BMP Title: Sanitary Sewer Maintenance Program BMP Description: The specific components listed below ensure proper maintenance and repair of sanitary sewer lines to minimize sanitary sewer overflows. Measurable Goals: Footage of lines cleaned Footage televised Number of sanitary sewer overflows Number of employees trained Timeline / Implementation Schedule: Ongoing program Specific Components & Notes (optional): Jetting and vac debris removal of lines Televising Employee training Root control Cured-in-Place Pipe (CIPP) when necessary Responsible Party Responsible Department Name: Carol Blommel Johnson Title: Utility Superintendent Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) cblommel@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

156 64 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 6-10 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement Illicit discharge detection & elimination Construction site runoff controls Post-construction stormwater management X Pollution prevention/good housekeeping BMP Title: Municipal Turf Maintenance Program BMP Description: Four divisions from two different departments conduct lawn care practices within the City. The specific components are listed below. Measurable Goals: Number of employees trained Timeline / Implementation Schedule: : Ongoing Development of procedures and documentation of training Specific Components & Notes (optional): Proper discharge of grass clippings Signage on City owned mowing equipment and Parks common room illustrating proper BMPs Noxious weed control in buffer strips Annual employee training Responsible Party(s) Responsible Department(s) Name: Mike Glewwe Department: Public Works Title: Street Superintendent Dept. Head: Matt Saam Phone: (952) Phone: (952) mglewwe@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Name: Dean Jacobson Title: Fleet Supervisor Phone: (952) djacobson@ci.apple-valley.mn.us Name: Tom Adamini Department: Parks Title: Park Maintenance Superintendent Dept. Head: Barry Bernstein Phone: (952) Phone: (952) tadamini@ci.apple-valley.mn.us bbernstein@ci.apple-valley.mn.us Name: Jim Zinck Title: Golf Course Supervisor Phone: jzinck@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): Annual employee training City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

157 65 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 6-11 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement Illicit discharge detection & elimination Construction site runoff controls X Post-construction stormwater management X Pollution prevention/good housekeeping BMP Title: Inspection Analysis and Frequency BMP Description: The City will keep records of inspection results, date, antecedent weather conditions, sediment storage and capacity remaining, and any maintenance performed or recommended for structural stormwater pollution control devices. After two years of inspections, if patterns of maintenance become apparent, the frequency of inspections will be adjusted to at least two (2) times annually, or more frequently as needed to prevent carry-over or washout of pollutants from the structures and maximize pollutant removal. If maintenance or sediment removal is not required as a result of both the first two annual inspections, the frequency will be reduced to once every two years. Measurable Goals: Number inspected Number of inspection modifications Annual Report summary of inspection results Timeline / Implementation Schedule: : Evaluate maintenance patterns every two years (odd years) and modify inspection frequency as required. Specific Components & Notes (optional): Structural pollution control device inspection and cleaning (BMP 6-2) Responsible Party Name: Carol Blommel Johnson Title: Utility Superintendent Responsible Department Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) cblommel@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

158 66 MS4 Name: City of Apple Valley Unique Identifying Number: 6-12 BMP Page Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement Construction site runoff controls Post-construction stormwater management X Illicit discharge detection & elimination X Pollution prevention/good housekeeping BMP Title: Stockpile, Storage and Material Handling Program BMP Description: The City will develop a procedure to identify and manage all exposed stockpiles to insure perimeter controls are in place and to prevent the offsite migration of stockpile material. Storage and material handling areas will be inspected in conjunction with the Hazardous Material Storage and Recycling Program (6-7) and the Fleet and Building Operation and Maintenance Program (6-6). Dry weather flows not explained by local areas of groundwater intrusion, local irrigation, or lift station discharge will be further investigated for illicit discharges and connections. Measurable Goals: Identification of exposed stockpiles Number of inspections conducted Number of illicit discharges and connections located as a result of inspections Timeline / Implementation Schedule: : Review stockpile locations annually : Implement stockpile, storage and material handling program : Conduct quarterly inspections and review and revise program needed : Inspect, document, investigate and enforce unexplained dry weather flows during inspections Specific Components & Notes (optional): Develop an integrated inspection program to quarterly inspect stockpiles, storage and material handling areas. BMP 3-6 Responsible Party(s) Responsible Department(s) Name: Mike Glewwe Department: Public Works Title: Street Superintendent Dept. Head: Matt Saam Phone: (952) Phone: (952) mglewwe@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Name: Carol Blommel Johnson Title: Utility Superintendent Phone: (952) cblommel@ci.apple-valley.mn.us City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

159 67 Name; Dean Jacobson Department: Public Works Title: Fleet Supervisor Dept. Head: Matt Saam Phone: (952) Phone: (952) Name: Tom Adamini Department: Parks Title: Park Maintenance Superintendent Dept: Head: Barry Bernstein Phone: (952) Phone: (952) Name: Jim Zinck Title: Golf Course Supervisor Phone: Educational components related to this BMP (description or number optional): Audience: City Employees Educational goal: Prevent discharges from stockpiles, storage and material handling areas Activities: See BMP Description above Implementation Plans: See Timeline/Implementation Schedule above Performance Measures: See Measurable Goals above City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

160 68 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 6-13 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement Illicit discharge detection & elimination Construction site runoff controls Post-construction stormwater management X Pollution prevention/good housekeeping BMP Title: Stormwater Treatment Effectiveness Assessment BMP Description: The City will develop a procedure to assess the effectiveness of its ponds at removal of total phosphorus (TP) and total suspended solids (TSS). Measurable Goals: Develop pond assessment procedure and schedule Implement pond assessment procedure and schedule Anti-degradation at major outfalls leaving the city and into priority lakes and water resources over the long term for TP and TSS. Specific Components & Notes (optional): Nondegradation plan developed during the 2006 MS4 Permit Metro area surface water management planning Local lake and stream TMDLs Responsible Party(s) Timeline / Implementation Schedule: : Develop a pond effectiveness and assessment procedure : Implement procedure according to the schedule developed Responsible Department(s) Name: Jessica Schaum Department: Public Works Title: Natural Resources Coordinator Dept. Head: Matt Saam Phone: (952) Phone: (952) jschaum@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Name: Brandon Anderson Title: City Engineer Phone: (952) banderson@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

161 69 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 6-14 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement Illicit discharge detection & elimination Construction site runoff controls Post-construction stormwater management X Pollution prevention/good housekeeping BMP Title: Facilities Inventory BMP Description: The City will review operations at city owned facilities and assess which BMPs apply to those operations and develop additional non-structural BMPs if warranted over the course of the permit term. Measurable Goals: 2015: Facilities Map 2016: Review and update 40% of facilities 2017: Review and update additional 30% June 30 th, 2018: Review and update 30% to reach cumulative 100% Timeline / Implementation Schedule: 2015: Develop Facilities Map : Review operations and update BMPs Specific Components & Notes (optional): GIS system identification Maintenance records Complaints records Operational plans Responsible Party Name: Jessica Schaum Title: Natural Resources Coordinator Responsible Department Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) jschaum@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

162 70 MS4 Name: City of Apple Valley Unique Identifying Number: 7-1 BMP Page Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement Construction site runoff controls X Post-construction stormwater management X Illicit discharge detection & elimination X Pollution prevention/good housekeeping BMP Title: Discharge Affecting Source Water Protection Areas BMP Description: The Minnesota Department of Health has approved a Part I and Part II Wellhead Protection Plan (WHP) for the City in 2005 including the necessary map illustrating the wells and source waters for drinking water supply management areas identified as vulnerable under Minn. R , , and The City will follow the recommendations outlined in the WHP. In addition, the City will incorporate Minnesota Department of Health guidance to evaluate stormwater infiltration projects being considered within vulnerable wellhead protection areas. This guidance will be incorporated into plan review procedures within three years of permit coverage. The City will coordinate with MDH to determine if the City jurisdictional area includes land within the source water protection area for surface water intakes identified in the source water assessments conducted by the Mn Dept. of Health under the federal Safe Drinking Water Act, U.S.C. 300j-13. If so, the City will work with the appropriate organizations to address potential impacts to the areas to the MEP and revise the SWPPP accordingly. Measurable Goals: Continue implementation of Wellhead Protection Plan as approved by MDH. Determine areas within the source water protection area for surface water intakes identified in the source water assessments conducted by the Mn Dept. of Health under the federal Safe Drinking Water Act, U.S.C. 300j-13. Coordinate with appropriate organizations and revise SWPPP accordingly. Incorporate MDH guidance to evaluate stormwater infiltration projects in vulnerable wellhead protection areas. Timeline / Implementation Schedule: According to MDH schedule Part I of WHP and DWSMA update approved in 2009 Part II of WHP and DWSMA update expected in Within 3 years of permit coverage. Specific Components & Notes (optional): Cooperate with adjacent municipalities or organizations to protect other MDH identified high or moderate vulnerable areas to storm sewer runoff when they are found to overlap the City s jurisdictional boundary. City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

163 71 Responsible Party Name: Carol Blommel Johnson Title: Utility Superintendent Responsible Department Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) Educational components related to this BMP (description or number optional): Audience: Citizens, well owners, cooperative agencies/organizations Educational goal: To protect drinking water sources from contamination from stormwater runoff pollution Activities: See BMP Description above Implementation Plans: See Timeline/Implementation Schedule above Performance Measures: See Measurable Goals above City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

164 72 MS4 Name: City of Apple Valley Unique Identifying Number: 7-2 BMP Page Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement Illicit discharge detection & elimination BMP Title: Record Keeping and Reporting Construction site runoff controls Post-construction storm water management X Pollution prevention/good housekeeping BMP Description: The City will submit an annual report according to the requirements outlined in the current MS4 permit and retain all records required for at least three (3) years beyond the term of the permit. The City will keep records on the dates of inspection and responses to the inspections, including the date of completion of repairs and major additional protection measures. All records, including the approved SWPPP, will be available to the public at reasonable times during regular business hours after a 7 day advance notice and reasonable charge for requested copies. Measurable Goals: Develop record keeping procedure Implement record keeping procedure Updates to record keeping procedure Timeline / Implementation Schedule: 2006: Develop record keeping procedure : Implement record keeping procedure Specific Components & Notes (optional): Responsible Party Name: Jessica Schaum Title: Natural Resources Coordinator Responsible Department Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) jschaum@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

165 73 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 7-3 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement Illicit discharge detection & elimination Construction site runoff controls X Post-construction stormwater management Pollution prevention/good housekeeping BMP Title: Nondegradation BMP Description: The City will prepare a Loading Assessment and Nondegradation Report as per Part X. Appendix D. Sections B & C of the 2006 MS4 General Permit. The City will follow the public participation process as per Part X. Appendix D. Section D of the 2006 MS4 General Permit. After consideration of the input received during the public participation process, the City will prepare and submit the materials required in Part X. Appendix D. Section E of the 2006 MS4 General Permit. During the MPCA review, notice, and preliminary determination processes, the City will work with the MPCA, if appropriate, to respond to comments and/or revise the submittal materials to prepare them for final approval. After final determination by the MPCA, the City will modify the SWPPP as per the approved submittal materials and as needed to meet the nondegradation requirements. Measurable Goals: Timeline / Implementation Schedule: The City will prepare and submit materials to meet the requirements listed 2007: Completed Nondegradation Report above. The City will respond to and coordinate with the MPCA, as appropriate, during the MPCA review, notice, and preliminary determination processes. Modify the SWPPP as per the approved modifications and as needed to meet the nondegradation requirements. Specific Components & Notes (optional): Responsible Party Name: Jessica Schaum Title: Natural Resources Coordinator Responsible Department Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) jschaum@ci.apple-valley.mn.us msaam@ci.apple-valley.mn.us Educational components related to this BMP (description or number optional): City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

166 74 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 7-4 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement Illicit discharge detection & elimination Construction site runoff controls X Post-construction stormwater management Pollution prevention/good housekeeping BMP Title: Response to Listing of Impaired Waters BMP Description: The following terms are used in the course of this BMP Description: trigger event impaired waters evaluation impaired waters report These terms are used to describe steps of a process to address a specific MS4 Permit requirement. These terms do not imply or mandate the creation of written reports or materials that must be submitted to the MPCA. Written documentation from these steps will be retained as part of the City s MS4 Permit records. These records will be retained as per Part VI.B. of the MS4 General Permit and available to the MPCA upon request. For waters that are impaired only for mercury, only Step 1 of this BMP will be implemented. Based on the Minnesota statewide mercury TMDL, it is be assumed that the City s MS4 discharge does not contribute to the mercury impairment. This assumption also applies to waters with multiple impairments that include mercury. For these waters, only the other non-mercury impairments must be addressed through Steps 2 through 5. As per 40 CFR and 122.3, the measures in this BMP will not be applied to flows from irrigated agriculture or agricultural stormwater runoff within the City s jurisdiction. The steps included in this BMP will be instigated by one or more of the following trigger events: 1: the extension of MS4 Permit coverage upon approval of the City s submittal materials and Application by the MPCA Commissioner (if this BMP is already incorporated into the SWPPP) 2: the release of a new 303(d) list of Impaired Waters by the MPCA that is approved by the USEPA. In Step 1, the City will review the Impaired Waters List to determine whether there are any impaired waters located within five miles of the City s boundaries that receive discharge from the City s MS4. Such waters will be identified as impaired waters of concern. This term is used only for the purposes of this BMP to define the set of impaired waters that must be addressed in the subsequent steps. The City will depend on the 303(d) list of Impaired Waters to make this determination. Where the information City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

167 75 in the list is insufficient, the City will contact the MPCA for further clarification. In Step 2, the City will identify the location(s) of discharge(s) from the City s MS4 to the impaired waters of concern identified in Step 1. Discharges may include pipes, outlets, ditches, swales, street gutters, or other discrete conveyances for stormwater runoff. As part of Step 2, the City will also delineate the watershed area within the City s jurisdiction that discharges to each impaired water of concern identified in Step 1. In Step 3, the City will prepare an impaired waters evaluation addressing the hydrology, land use, and other characteristics of each watershed area delineated in Step 2. In Step 4, the City will prepare an impaired waters report. This report will address the results of the steps listed above along with a determination of whether changes to the City s SWPPP are warranted to reduce the impact from the City s MS4 stormwater discharge to each impaired water of concern. In Step 5, the City will incorporate the changes identified in the impaired waters report into the City s SWPPP, as per the provisions of the MS4 General Permit regarding SWPPP modifications. The changes to the SWPPP will be reported in the subsequent Annual Report, along with a summary of the process (as listed above) that resulted in the changes Measurable Goals: Step 1: Completion of the City s determination whether there are impaired waters of concern Step 2: A map showing the locations of discharges and delineated watershed areas. Step 3: Completion of the impaired waters evaluation Step 4: Completion of the impaired waters report Step 5: Changes to the City s SWPPP. Timeline / Implementation Schedule: Step 1: Within 2 months of a trigger event Step 2: Within 6 months of a trigger event Step 3: Within 12 months of a trigger event Step 4: Within 12 months of a trigger event Step 5: With 18 months of a trigger event Specific Components & Notes (optional): The steps listed in this BMP will be executed in response to the listing of impaired waters. It is likely that these tasks will precede (perhaps by years) the initiation and completion of the TMDL Study and Waste Load Allocation for these impaired waters. The data, information, and understanding of the water quality problems and solutions for the impaired waters will be significantly less at the time of the preparation of these materials than when the TMDL Study and the Waste Load Allocation have been completed. For this reason, the level of analysis and the breadth of the response by the City will be significantly less for the preparation of these materials and modifications to the SWPPP at this time than at the time of the completion of the TMDL Study and the Waste Load Allocation. The City s analysis and response for this BMP will be based on data and information that are readily available at the time. City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

168 76 Responsible Party Name: Jessica Schaum Title: Natural Resources Coordinator Responsible Department Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) Educational components related to this BMP (description or number optional): City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

169 77 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 7-5 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement Illicit discharge detection & elimination Construction site runoff controls X Post-construction stormwater management Pollution prevention/good housekeeping BMP Title: Long and Farquar Lakes Nutrient TMDL BMP Description: The City, with assistance from the watershed and PCA, developed a TMDL to address the nutrient impairments in Long and Farquar Lakes. The majority of the lakes watersheds are contained within Apple Valley, which was the only entity assigned a load reduction. The City developed the Implementation Plan with an understanding of what funding is expected during the implementation period and what feasibly accomplishable BMPs are available for use within the watersheds. As the area is almost entirely built-out and the City s stormwater re/development standards are fairly strong, most projects/tasks listed within the implementation plan will involve retrofitting the existing stormwater infrastructure. The City will continue to monitor nutrient, clarity, and algal levels on the lakes and perform/install implementation tasks/projects throughout the implementation term as funding and resources allow. If the waterbodies fail to meet water quality standards by 2020 the City will further investigate additional measures that may be taken to achieve standards. Measurable Goals: Lakes water quality Timeline / Implementation Schedule: Complete: Approved TMDL Ongoing: Monitor lakes water quality : Implementation Plan completion and approval : Implement nonstructural BMPs specified in Implementation Plan : Install structural BMPs specified in Implementation Plan as funding and resources allow : Evaluate success 2020: Update Implementation Plan if needed Specific Components & Notes (optional): BMPs 6-8, 1-9, 2-2, 2-5, & 2-6 Apple Valley MS4 SWPPP Chapter Apple Valley Code of Ordinances Policies 2.2, 2.3, 2.4, 2.5, 2.6, 3.1, 3.3, 5.2, 5.3, and Apple Valley SWMP Long and Farquar Lakes Nutrient TMDL approved April 2009 Long and Farquar Lakes Nutrient TMDL Implementation Plan City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

170 78 Responsible Party Name: Jessica Schaum Title: Natural Resources Coordinator Responsible Department Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) Educational components related to this BMP (description or number optional): City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

171 79 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 7-6 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement Illicit discharge detection & elimination Construction site runoff controls X Post-construction stormwater management Pollution prevention/good housekeeping BMP Title: Crystal, Keller, and Lee Lakes TMDL and Earley Lake Water Quality Assessment BMP Description: The Black Dog Watershed Management Organization, with assistance from the MPCA, developed a TMDL to address the nutrient impairments in Crystal, Keller, and Lee Lakes. Keller Lake is the only waterbody within the study for which a WLA was assigned to the City of Apple Valley. The City had begun implementation, with some implementation activities completed prior to approval of the TMDL. As the area is entirely built-out and the City s stormwater re/development standards are fairly strong, implementation will likely focus on stormwater infrastructure retrofit projects and changes to City operations (ie, street sweeping). Due to funding limitations and existing operational burdens, implementation of the Long and Farquar Lakes TMDL will take precedence over implementation activities for the Crystal, Keller, and Lee Lakes TMDL. The City will continue to work with the Watershed and affected organizations to strategize means and methods to improve the water quality in Keller Lake. Measurable Goals: Timeline / Implementation Schedule: Keller Lake water quality per BDWMO Complete: Approved TMDL by BDWMO and others and others Complete: Improvements to Redwood Pond Complete: Installation of Whitney Pond : Install Valley Middle School Raingarden Pending Council and School District Approval : Evaluate Success Specific Components & Notes (optional): BMPs 2-5 Apple Valley MS4 SWPPP Chapter Apple Valley Code of Ordinances Policies 2.2, 2.3, 2.4, 2.5, 2.6, 3.1, 3.3, 5.2, 5.3, and Apple Valley SWMP Crystal, Keller, and Lee Lakes TMDL and Earley Lake Water Quality Assessment Crystal, Keller, and Lee Lakes TMDL and Earley Lake Water Quality Assessment Implementation Plan City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

172 80 Responsible Party Name: Jessica Schaum Title: Natural Resources Coordinator Responsible Department Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) Educational components related to this BMP (description or number optional): City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

173 81 BMP Page MS4 Name: City of Apple Valley Unique Identifying Number: 7-7 Minimum Control Measures Addressed by This BMP Public education & outreach Public participation & involvement Illicit discharge detection & elimination Construction site runoff controls X Post-construction stormwater management Pollution prevention/good housekeeping BMP Title: Vermillion River Watershed TMDL BMP Description: The Vermillion River Watershed Joint Powers Organization, with assistance from the MPCA, developed a TMDL to address multiple impairments in the watershed. Alimagnet Lake and East Lake are the only waterbodies within the study for which a WLA has been assigned to the City of Apple Valley; both lakes are impaired for excess nutrients (phosphorus). The City had begun implementation, with some implementation activities completed prior to approval of the TMDL. The Alimagnet Lake subwatershed is entirely built-out and the City s stormwater re/development standards are fairly strong, implementation will likely focus on stormwater infrastructure retrofit projects and changes to City operations (ie, street sweeping) within this subwatershed. The East Lake subwatershed does have a small area in which development is occurring and may offer opportunities for treatment that goes beyond development standards in addition to retrofit projects and changes to City operations. Due to funding limitations, existing operational burdens, and multiple TMDLs within the City, implementation of the Vermillion River Watershed TMDL will be prioritized accordingly. The City will continue to work with the Watershed and affected organizations to strategize means and methods to improve water quality in East and Alimagnet Lakes. Measurable Goals: Timeline / Implementation Schedule: Alimagnet Lake water quality per Complete: Approved TMDL by VRWJPO Burnsville and others and others East Lake water quality per Lakeville and Complete: Improvements to McNamara others Pond Complete: Improvements suggested in the 2005 Management Plan for Alimagnet Lake : Cooperate with subwatershed assessment development and Implementation Plan development by VRWJPO and others : Install structural BMPs and implement nonstructural BMPs : Evaluate success City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

174 : Cooperate with updating Implementation Plan by VRWJPO and others if needed Specific Components & Notes (optional): BMPs 2-5 Apple Valley MS4 SWPPP Chapter Apple Valley Code of Ordinances Policies 2.2, 2.3, 2.4, 2.5, 2.6, 3.1, 3.3, 5.2, 5.3, and Apple Valley SWMP 2015 Vermillion River Watershed Restoration and Protection Strategy (WRAPS) Report 2015 Vermillion River Watershed TMDL Report Responsible Party Responsible Department Name: Jessica Schaum Title: Natural Resources Coordinator Department: Public Works Dept. Head: Matt Saam Phone: (952) Phone: (952) Educational components related to this BMP (description or number optional): City of Apple Valley Stormwater Pollution Prevention Program (REV. 03/07/17)

175 Appendix B Wetland Assessment

176 Wetland Assessment There are approximately 300 wetlands within the City of Apple Valley listed on the National Wetland Inventory (NWI, see Section 2.7). Thirty (30) of these wetlands are located in the Black Dog Watershed Management Organization (BDWMO) jurisdiction with the remaining approximately 270 wetlands located in the Vermillion River Watershed Joint Powers Organization (VRWJPO) jurisdiction. The City of Apple Valley serves as the local governmental unit (LGU) responsible for administering the Wetland Conservation Act (WCA). As part of those duties and consistent with the requirements of the BDWMO and VRWJPO, the city inventories and assesses wetlands within its jurisdiction. The City s wetland inventory has been completed in phases over time and is periodically updated. In addition, the City s inventory is augmented by a 2006 wetland inventory and assessment of wetlands within the VRWJPO performed by the Dakota County Soil and Water Conservation District (Dakota SWCD). The Dakota SWCD inventory utilizes an off-site methodology including aerial photography, National Wetlands Inventory data, county soils data, MDNR Public Waters maps and data on rare or endangered communities and species. The primary focus of the Dakota SWCD inventory was on water quality protection. Because the primary goal and methodology of the SWCD assessment is slightly different than the City assessment, the same wetland may be ranked differently in each. However, comparison of wetlands included in both inventories found most to be ranked similarly in each inventory. Discrepancies included slightly different evaluation criteria and the use of on-site data in the City s assessment. For this reason, the Apple Valley assessment should be used for wetland management when available. However, if the wetland has not been assessed using the City inventory, the Dakota County SWCD inventory data and classification system should be used to provide wetland management recommendations until the wetland is assessed using the City s field-based method. B.1 Wetland Inventory and Assessment Approach The City selected 57 wetlands for the initial wetland evaluation in 2006, including 30 wetlands within the BDWMO and 27 wetlands within the VRWJPO, as identified in the NWI. The wetlands initially selected were located in high priority watersheds that drained to major recreational resources within the city or park locations where there may be opportunities for enhancement and restoration for aesthetics and enjoyment within the parks. Subsequent inventories have followed a similar methodology. Of the 57 wetlands initially evaluate, seven wetlands listed on the NWI were found to be non-wetland during site visits and were not further classified because it is anticipated they will not be managed or regulated as wetlands. The remaining 50 wetlands, including 24 in the BDWMO and 26 in the VRWJPO, were evaluated and classified. The objectives of the inventory and assessment approach include the following: Determine the attainable use for the wetlands. Identify water quality treatment or enhancement potential of wetlands.

177 Identify potential aesthetic and wildlife habitat improvements to wetlands and adjacent buffers. Determine wetland protection criteria. Determine wetland stormwater susceptibility. Determine wetland management classification. Produce detailed management criteria for priority wetlands. B.2 Inventory and Assessment Methodology The City s wetland inventory and assessment process involved the following steps: Preliminary mapping and identification of wetlands within the project area to be assessed, including numbering of wetlands to be assessed. Field evaluation/site assessment and determination of potential restoration sites. Qualitative ranking of each wetland, based on community type and quality. Prior to beginning any field assessments, preliminary wetland determinations were made using NWI data (see Section 2.7). Other information that was also reviewed included the Natural Heritage and Threatened and Endangered species databases (see Section 2.8) and existing stormwater maps. Thirty wetlands located within the BDWMO were selected for assessment. Wetland identification numbers used in the wetland inventory are based on the township, range and section in which the wetlands exist. Each wetland is identified by the following numbers: County Code (CC), Township (T), Range (R), Section (S) and then an individual number for the wetland within the section. The following is an example of the wetland ID: CC T R S wetland number Figure 2-10 identifies wetlands within the city. Only the last 5 digits of the ID number (section and wetland number) are used to identify wetlands on the included figure, as the county, township, and range number are the same for the entire city. Each wetland inventoried was assessed in the field. During the field visit, the following parameters were evaluated for each wetland: Wetland Type (Cowardin and Circular 39 type). Natural community type and quality. Floral Diversity. Restoration potential for hydrology and vegetation. Direct Stormwater Inputs. Adjacent land uses. Aesthetic Value. Alterations to the site and its immediate watershed.

178 Inventoried wetlands were evaluated according to a hybrid methodology adapted to Apple Valley s urban setting by using a method that combined the vegetative diversity and integrity sections of the Minnesota Routine Assessment Method (MnRAM) and a customized Restoration Potential Evaluation section. These methodologies are summarized in the following sections. The City assessment method initially considered the urban quality of life functional value portion of the New Hampshire Method for wetland evaluation, but this section of the assessment was abandoned after results of the initial inventory showed that it was not a differentiator. B.2.1 MnRAM Vegetative Diversity and Integrity Section This evaluation method is included in the City s assessment to understand the diversity and integrity of the plant communities within each wetland basin inventoried. Diversity refers to species richness, i.e., number of plant species. Integrity refers to the condition of the plant community in comparison to a reference standard for that community. Generally, the more floristically diverse a community is, the higher its ranking in this section. The highest ranking is given to those communities that represent the characteristic condition of that particular community. The degree (e.g., minor versus substantial) and type of disturbances typically play an important role in the diversity/integrity of plant communities. Typically, the more human-related disturbances that are evident, the more negatively impacted the plant communities tend to be. The City s initial wetland inventory used MnRAM version 3.0. Information about current MnRAM methodology is available from the BWSR website at: B.2.2 Wetland Restoration and Enhancement Section The Restoration and Enhancement Section of the evaluation considers specific information about a particular wetland basin regarding its hydrologic and/or vegetation restoration potential. Hydrologic alterations potentially affecting wetlands include diversion of runoff by storm sewer, ditches, draintile, or other infrastructure. Vegetative alteration may include invasive species, mowed buffer areas, or other alterations to the landscape. The restoration/enhancement factors considered in this evaluation include: Ease of restoration/enhancement as it relates to cost, time, complexity and level of nonnative species infestation/control that is required; Number of landowners; Surrounding buffer size and vegetative quality (especially level of invasive species); Opportunity to restore ecological connectivity to other areas; and Site-specific activities to undertake in a particular wetland basin such as vegetation restoration activities/cost, wildlife habitat management opportunities, and aesthetics. Using the data collected during the field visit, personnel were able to rate each of the above functions (floral diversity, urban quality of life, restoration potential) as low, medium, high, or exceptional. These function ratings were then used to develop a wetland management classification system and stormwater susceptibility ranking (see Section B.3.1).

179 B.3 Wetland Management Classifications Wetland management classifications were determined using a flow chart that ranked the wetland based on the functional values determined in the field using the criteria of vegetation diversity/integrity, presence of direct stormwater inputs, restoration potential, and location in public space (see included figure). First, a vegetation diversity/integrity determination was made for each plant community within a wetland, using criteria established by MnRAM. While these criteria vary for different plant communities, the levels of native plant diversity, exotic/invasive species infestations, adjacent land use, and other disturbance indicators form the basis for this determination. Wetlands were also evaluated for the presence of direct stormwater inputs (observed or indicated on the City stormwater maps) because of the affect that untreated stormwater inputs can have on a wetland s quality and diversity. Restoration potential was determined by comparing several factors in and around the wetland. Wetlands having higher floral diversity ranked higher in enhancement potential than those with lower diversity did. This is because wetlands with higher floral diversity will require less time and effort to maintain species diversity, whereas those with lower diversity will require more work (seeding, planting etc.) and effort. In addition, wetlands that had wide buffers, low levels of invasive species, and one land owner ranked higher in restoration potential than those without these characteristics. Those wetlands that were completely within public space ranked highest in that portion of the restoration potential section. The Minnesota Natural Heritage database and MDNR information on rare, threatened, and endangered species was also reviewed for the surveyed wetlands. A brief description of the wetland classification type requirements is included in Table B-1.

180 Table B-1 Eutrophication Water Quality Standards for Apple Valley Waterbodies City Wetland Classification Description Wetlands meeting any of the following criteria: Protect Manage 1 Listed as a Natural Heritage Site Rare or endangered plant or animal species within 0.25 miles Exceptional or high floral diversity/integrity Mapped on the MDNR s Map of Rare Features Wetlands meeting the following criteria: Medium floral diversity/integrity No direct stormwater input Wetlands meeting the following criteria: Manage 1- Restore Medium floral diversity/integrity Direct stormwater input High or exceptional restoration potential Located in public or open space Wetlands meeting the following criteria: Manage 2 Medium floral diversity/integrity, Direct stormwater input High or exceptional restoration potential Not located in public or open space Wetlands meeting the following criteria: Manage 2- Restore Direct stormwater input Located on public land Medium floral diversity/integrity with medium restoration potential OR low floral diversity/integrity with exceptional restoration potential Wetlands meeting the following criteria: Manage 3 Direct stormwater input, and Medium floral diversity/integrity, medium restoration potential and are not located in public or open space OR low floral diversity/integrity with restoration potential that is not exceptional B.3.1 Stormwater Susceptibility Determination Site visits to wetlands included a verification of the wetland community type and documentation of the plant communities. The technical paper Storm-Water and Wetlands: Planning and Evaluation Guidelines for Addressing Potential Impacts of Urban Storm-Water and Snow-Melt Runoff on Wetlands (1997) prepared by the State of Minnesota Stormwater Advisory Group was used as a guide in the determination of wetland sensitivity to stormwater. This document divides wetlands into categories that include: highly susceptible, moderately susceptible, slightly susceptible, and least susceptible. The following are the guidelines used in this document to assess wetland susceptibility to stormwater impacts.

181 Highly Susceptible A wetland is considered highly susceptible if 40% or more of the wetland complex has one or more of the following highly susceptible wetland communities and has medium to exceptional floral diversity/integrity within the susceptible wetland community or communities. Highly susceptible wetland communities include: Sedge Meadow, Bogs, Coniferous Bogs, Open Bogs, Calcareous Fens, Low Prairies, Coniferous Swamps, Hardwood Swamps, and Seasonally Flooded Basins. Moderately Susceptible A wetland is considered moderately susceptible if 40% or more of the wetland complex has one or more of the following moderately susceptible wetland communities and the wetland has medium to exceptional floral diversity/integrity within the susceptible community or communities. Moderately susceptible wetland communities include: Shrub-Carrs, Alder Thickets, Fresh (wet) Meadows, Shallow Marsh, Deep Marsh, and Shallow Open Water. Slightly and Least Susceptible Wetlands with low floral diversity as determined by MnRAM were considered to be least susceptible wetlands. Wetlands that do not fall under the high or moderate categories are considered slightly susceptible. These classifications are important because they provide guidance on which wetlands should be protected from additional stormwater inputs and which wetlands could be modified to improve stormwater treatment as well as enhance wildlife habitat. For example, if a slightly or least susceptible wetland is located upstream of a highly susceptible or moderately susceptible wetland or lake basin, it may be appropriate to modify the upstream wetland basin to decrease pollutant loading to the downstream basin. In order to insure that these modifications benefit both water quality and wildlife habitat functions, design guidelines have been developed that involve creating a meandered wetland edge, preserving aquatic benches for shallow water habitat and emergent growth, and planting of native emergent vegetation to increase habitat diversity.

182 B.3.2 Wetland Restoration and Enhancement Wetlands assigned to Manage 1-Restore or Manage 2-Restore were further evaluated to determine wetland restoration/enhancement priorities. Wetland restoration priorities were developed based on perceived ease of hydrologic restoration, quality/size of existing buffer, public/private ownership and existing vegetation quality. These sites include basins that are owned completely by one owner or in public ownership, and were determined to have a medium or high vegetation restoration potential and high buffer quality during the field assessment. The following summarizes the wetland restoration or enhancement potential categories used in the City inventory and the evaluation criteria used to assign wetlands to each category. Exceptional Minimal effort would be required to correct hydrologic alterations or no alterations currently exist. Wetland currently has a good to excellent quality plant community with minimal or no effort required to maintain. Wetland has an un-mowed herbaceous buffer at least 25 feet wide and wetland is completely within public ownership. High Minimal effort would be required to correct hydrologic alterations. Examples include blocking a small ditch, breaking one or a few tile lines, taking minor corrective actions within the watershed to restore the historic quantity and/or quality of waters reaching the wetland. Upland buffer is feet wide. Basin is owned by one landowner. Site has good quality plant communities, minimal effort required to restore composition, structure, and function for community type. Efforts needed include minor species reintroduction, limited management via cutting, spot herbicide treatment, prescribed fire, and/or other practices within the wetland. Limited exotic/invasive species infestations. Medium Some physical and financial efforts would be required to restore these communities. Upland buffer is 3-11 feet wide. Basin owned by two landowners. Moderate quality site, some physical and financial efforts are required to restore vegetation. For example, reseeding portions of the wetland and multi-year efforts that include a variety of management tools. Includes crop fields that can be seeded, hydrologically restored, and has potential to achieve moderate quality within 5-25 years, and existing wetland communities with low to moderate exotic/invasive species infestations. Low These communities have often experienced significant hydrologic alteration through human activity. Improvement of these communities often requires substantial efforts. Upland buffer is 0-3 feet wide. Basin owned by 3 or more landowners. Low quality sites are often dominated by nonnative species, or are in a cultivated field known to have problem species (on-site or in seedbank). Restoration/improvement requires substantial efforts over or more years. Examples include reseeding of significant portions of wetland, multi-decade restoration efforts requiring a variety of management tools, both within the wetland and in the immediately surrounding upland buffer. Wetland restoration and enhancement sites were identified during the field inventory. Generally, the priority sites for wetland restoration and enhancement are those that have experienced minor alterations in hydrology or have high floral diversity and large buffer areas. Most of these areas are located in public or open space and thus give the City the opportunity to implement restoration or enhancement opportunities that will provide benefits to the public.

183 Appendix B Apple Valley Wetland Assessment Methodology 1. Review NWI data, create preliminary maps, and review Natural Heritage and T/E species databases. 2. Determine wetlands to be assessed. 3. Assign Wetland ID. 4. Field evaluation using database (see summary of field assessment below). a. MnRAM V3.0 Vegetative Diversity and Integrity Section b. New Hampshire Method Urban Section c. Restoration\Enhancement Potential Evaluation d. Record any additional field observations including presence of direct stormwater inputs. 5. Rate stormwater susceptibility based on wetland community and vegetative diversity/integrity. 6. Rate functions for each wetland based on field evaluation and classify wetland according to wetland classification system (Figure 6.1). Summary of Apple Valley Wetland Field Assessment General Information Evaluator, Date, County, City, Section, TWP, Range, Picture #, Subdistrict, OHW, DNR Wetland ID, Circular 39 Type Access denied. Yes/No Total size (acres). No wetland? Entire wetland filled? Wetland part of another (via excavation)? Potential Restoration? Describe temporal factors of this assessment due to seasonal considerations and/or existing hydrologic and climatologic conditions (e.g. after heavy rains, snow or ice cover, frozen soil, during drought period, during spring flood, bird migration). List all inlets and outlets.

184 Appendix B Vegetation Section List community type and percent cover of wetland by each community. Community ID, Percent Cover, NWI/Cowardin MnRAM Community Type. MnRAM Quality. List dominant species (>10%). List other species. List invasive species. Community Hydrology. Beaver Pond, Ditched, Tiled, Farmed, Diked/Impounded, Art. Substrate, Spoil, Excavated, Stm. Mgmt, Wildlife Mgmt, Reservoir, Livestock watering hole, Stream present, Ditch present, Grnd discharge/springs present, Fill added, Mowed, Grazed, Docks added. Restoration Section 1. Indicate the number of landowners that would be affected by the wetland restoration project. Exceptional : Completely within public ownership High: 1 Moderate: 2 Low: 3 or more 2. What percent of the wetland is surrounded by public land? Exceptional: % High: 50-74% Moderate: 25-49% Low: < 25% 3. Does the wetland have potential for hydrologic restoration without flooding: roads, houses, septic systems, golf courses or other permanent infrastructure (active agricultural fields are acceptable uses within potential restoration areas) within the restoration area? If yes: 4. Indicate the type of hydrologic alteration.

185 Appendix B 5. Enter the existing wetland area and estimated size of the total wetland if effectively drained or filled areas were restored (not including any buffer areas). Size of existing wetland. Total wetland including restorable and existing wetland. Calculated potential new wetland area. 6. Rate the opportunity to restore the ecological connectivity of this wetland to other areas. Exceptional: Currently connected to other natural/semi-natural areas that may include wetland and/or upland areas. High : Basin has good opportunity to restore connectivity to extensive natural communities that appear to be in good condition, and thus both wildlife and aesthetic value of the area could be improved by enhancing wetland quality. Moderate: Basin is near or adjacent to smaller areas of woods, prairie, or old field, or is at one end of a corridor. Low : Basin is isolated within an intensely used landscape, such as agricultural field, urban, or development setting. 7. Rate the potential ease of wetland restoration. Exceptional High Moderate Low 8. Indicate the potential restoration wetland classification according to the Circular 39 (USFWS, 1956): Types Comments 10. Enter the average width of naturalized upland buffer that could potentially be established around the restored wetland. 11. Current Buffer Width. 12. Dominant Vegetation Type. 13. Rate the Condition of the existing buffer. Exceptional Unmowed herbaceous buffer at least 25 wide. Good Unmowed buffer, wide Moderate Unmowed buffer, 3-11 wide Low Buffer less than 3, mowed to edge or bordered by impervious 14. List and estimate the aerial cover of ALL exotic/invasive species present within the buffer. 15. Rate the ease in restoration/planting aquatic vegetation.

186 Appendix B NA: Wetland type does not support aquatic vegetation. Exceptional: Adequate aquatic vegetation present, little to no effort required. Good: Minor bounce, geese/muskrats, substrate, low sedimentation, and other conditions appear conducive to planting. Aquatic shelf 1 or less, and >=8 wide. Moderate: Several feet of vertical bounce evident, substrate as well as evidence of herbivores and moderate sedimentation would likely make restoration of aquatic plants more problematic. Aquatic shelf 1 or less deep and 5-7 wide. Low: More than 3 feet of vertical bounce evident, substrate not conducive to planting, clear signs of heavy sedimentation and herbivores such as geese/muskrat. Aquatic shelf <= 1 deep, less than 5 wide. 16. Comments 17. Rate the wetland vegetation restoration potential. Exceptional Wetland currently has a good to excellent quality plant community, minimal or no effort required to maintain. High site has good quality plant communities, minimal effort required to restore composition, structure, and function for community type. Efforts needed include minor species reintroduction, limited management via cutting, spot herbicide treatment, prescribed fire, and/or other practices within the wetland. Limited exotic/invasive species infestations Moderate Moderate quality site, some physical and financial efforts required to restore vegetation. E.g., reseeding portions of the wetland, and multi-year efforts that include a variety of management tools. Wetland: includes crop field that can be seeded, hydrologically restored, and has potential to achieve moderate quality within 5 25 years, and existing wetland communities with low to moderate exotic/invasive species infestations. Watershed: moderate efforts required to restore historic quantity/quality of waters reaching wetland. Low Low quality sites, often dominated by nonnative species, or be in a cultivated field known to have problem species (onsite or in seedbank). Restoration/improvement requires substantial efforts over or more years. Examples include reseeding of significant portions of wetland, multi-decade restoration efforts requiring a variety of management tools, both within the wetland and in the immediately surrounding upland buffer. Wetland: crop field that can be seeded and hydrologically restored, but would require significant long-term maintenance in order to achieve at least moderate quality in years, or severe levels of exotic species (note potential seedbank both onsite and through tributary systems). Watershed: significant efforts to restore vegetation are necessary, or development is complete (or nearly so) and there are few opportunities for corrective action.

187 Appendix B New Hampshire Method Section 1. Dominant land use within 0.5 miles of the wetland High: C/I/HDR/Trans Moderate: Rural/Res Low: Ag/Open Space 2. Rate of development within 0.5 miles of the wetland High: Rapidly Developing/Developed Moderate: Moderate Development Low: Little/No Development 3. Area of shallow permanent open water (including streams) High: >= 0.5 acre Low: < 0.5 acre 4. Wetland Diversity High: Two or more communities Low: One community 5. Stream corridor vegetation High: >75% of stream corridor is covered in mixed veg for 1000' up/down stream Mod: 25% - 75% of stream corridor is covered in mixed veg for 1000' up/down stream Low: <25% of stream corridor is covered in mixed veg for 1000' up/down stream 6. Number of wetland classes visible from primary viewing location High: Two or more classes Low: One class 7. Approximate extent of open water visible from primary viewing location(s) High: >= 0.5 Ac. or 200' of stream Low: < 0.5 acre or 200 of stream 8. Area of wetland dominated by flowering trees or shrubs, OR shrubs which turn vibrant colors in the fall. High: >= 1.0 acre Low: <1.0 acre 9. General appearance of wetland visible from primary viewing location(s). High: No major detractors Moderate: Some detractors not easily removed Low: Major detractors not easily removed

188 Appendix B 10. Water quality of watercourse, pond, or lake associated with the wetland High: Minimal pollution Medium: Moderate pollution Low: STINKY WATER! 11. Hazard(s) which may limit public use High: No major hazards and/or correctable hazards Moderate: Existing hazards moderately difficult to correct Low: Major hazards difficult and/or $$ to correct

189 Wetland ID WD Type Floral Diversity/ Integrity Appendix B Wetland Assessment Summary Table City of Apple Valley Wetland Restoration Potential Overall Urban Quality Direct Stormwater Input Located in Public or Open Space Within ¼ mile T/E species Classification Stormwater Susceptibility VR 3 Low Low Medium x M3 Least VR 3 Low Medium High x x M3 Least VR 2 Low Low High x M3 Least VR 5 Medium Medium High x x M3 Moderately VR 5 Medium Medium High x x M3 Moderately VR 5 Low Exceptional High x x M2R Least VR 4 Medium High High x x M1R Moderately VR 5 Medium High High x x M1R Moderately VR 2 Medium High Medium x M1 Moderately VR 2 Low High Medium x M3 Least VR 2 Medium Medium High x M1 Moderately VR 3/5 Medium Low High M1 Moderately BD 2 Low Low Medium x M3 Least BD 5 Low Medium Medium x x M3 Least BD 5 Medium Exceptional High x x M1R Moderately BD 3 Low Exceptional Medium x M2R Least BD 5 Medium Exceptional High x x M1R Moderately BD 2 Low High High x x M3 Least BD 2/3 Medium Medium Medium M1 Moderately BD 5 Medium High Medium x x M1R Moderately BD 5 Low Low Medium M3 Least BD 5 Medium High High x M2 Moderately BD 3 Medium High Medium x M2 Moderately BD 5 Medium Medium Medium x x M2R Moderately BD 5 Low Low High x M3 Least BD 3 High Exceptional High P Moderately BD 5 Medium Medium Medium M1 Moderately Bonestroo Rosene Anderlik & Associates City of Apple Valley, SWMP Update-Project No of 2

190 Wetland ID Type Floral Diversity/ Integrity Appendix B Wetland Assessment Summary Table City of Apple Valley Wetland Restoration Potential Overall Urban Quality Direct Stormwater Input Located in Public or Open Space Within ¼ mile rare or T/E species Totals Protect (P) = 6; Manage 1 (M1, M1R) = 11; Manage 2 (M2, M2R) = 5; Manage 3 (M3) = 28 Classification Stormwater Susceptibility BD 3 Medium Low Medium X M3 Moderately BD 5 Low Low High x M3 Least VR 3/6 High Medium High x x P Moderately BD 5 Medium High High x x P Moderately BD 5 Low Low Medium M3 Least BD 1/7 Low Low Medium x M3 Slightly BD 2 Low Medium Medium M3 Least VR 5 Low Low High x M3 Least VR 1/7 Medium Medium High x M1 Highly VR 4 Low Low Medium x x x P Least VR 5 Low Low Medium x x x P Least VR 5 Low Low Medium x x M3 Least VR 2/3/6 Low High High x M3 Least VR 5 Medium Medium High x M3 Moderately VR 2/3/5 /6 Low Low High x M3 Least VR 5 Low Low High x M3 Least VR 5 Low Low High x M3 Least VR 2/3/6 Low Medium High x x M3 Least VR 5 Low Medium High x x M3 Least VR 5 Low Medium High x x x P Least VR 5 Low High Medium x M3 Least VR 5 Low Medium Medium x M3 Least VR 5 Medium Low Medium x M3 Moderately Bonestroo Rosene Anderlik & Associates City of Apple Valley, SWMP Update-Project No of 2

191 Wetland is a Natural Heritage Site or has rare, threatened, and/or endangered plant and animal species associated with wetlands present within 1/4 mile (including those that are rare locally) Yes Protect No Yes Exceptional or High Floral Diversity/Integrity Direct Stormwater Input No Manage 1 No Yes Yes Manage 1, Restore Yes Medium Floral Diversity/Integrity Restoration Potential High or Exceptional No Yes Located in Public or Open Space No Manage 2 No Restoration Potential Medium Yes Located in Public or Open Space Yes Yes Manage 2, Restore No Located in Public or Open Space No Low Floral Diversity/Integrity Yes Restoration Potential Exceptional Yes No No Manage 3 Wetland Management Classification Flow Chart City of Apple Valley Surface Water Managment Plan Figure B-1