WELLHEAD PROTECTION PLAN Part 2

Transcription

1 WELLHEAD PROTECTION PLAN Part 2 Part 2: Potential Contaminant Source Management Strategy Impacts of Expected Changes to Land and Water Resources Issues, Problems & Opportunities Wellhead Protection Plan Goals Management Strategies Evaluation Plan Emergency/Conservation Plan 2015

2 TABLE OF CONTENTS Page Number I. PUBLIC WATER SUPPLY PROFILE 3 II. DOCUMENTATION LIST 4 III. EXECUTIVE SUMMARY 5 IV. CHAPTER 1 - Data Elements, Assessment 10 V. CHAPTER 2 - Impact of Changes on Public Water Supply Well(s) 16 VI. CHAPTER 3 - Issues, Problems and Opportunities 18 VII. CHAPTER 4 - Wellhead Protection Goals 22 VIII. CHAPTER 5 - Objectives and Plans of Action 23 IX. CHAPTER 6 - Evaluation Program 38 X. CHAPTER 7 - Alternative Water Supply Strategy 39 XI. APPENDIX A - Referenced Data for Part 2 Amendment 48 List of Figures Figure 1: City of Walker DWSMA and WHPA Areas 7 Figure 2: Walker East DWSMA and Vulnerability Assessment 8 Figure 3: Walker West DWSMA and Vulnerability Assessment 9 List of Tables Table 1: Five-year Precipitation Data 10 Table 2: Wells 4 and 5 Production Summary 14 Table 3: Official controls, plans and other Local, State and Federal Programs 20 2

3 PUBLIC WATER SUPPLY PROFILE PUBLIC WATER SUPPLY NAME: City of Walker ADDRESS: P.O. Box 207 Walker, MN TELEPHONE NUMBER: WELLHEAD PROTECTION MANAGER NAME: Ms. Terri Bjorklund Clerk/Administrator ADDRESS: P.O. Box 207 Walker MN TELEPHONE NUMBER: WELLHEAD PROTECTION TECHNICAL ASSISTANCE NAME: Chris Parthun / Planner, Source Water Protection Unit ADDRESS: TELEPHONE NUMBER: CONSULTANT/TECHNICAL ASSISTANCE NAME: AC Analytical & Consulting, LLC ADDRESS: P.O. Box 248 Bemidji, MN TELEPHONE NUMBER:

4 DOCUMENTATION LIST STEP PERFORMED Part I Approval Notice Received from MDH November 2013 Scoping 2 Meeting Held ( , subp. 1 December 2013 Scoping Decision Notice Received ( , subp. 2) January 2014 Remaining Portion of Plan Submitted to Local Units of February 2015 Government (LUGs) ( , subp. 1 & 2) Review Received From Local Units of Government May 2015 ( , subp. 2) Review Considered ( , subp. 3) May 2015 Public Hearing Conducted ( , subp. 4) May 2015 Remaining Portion WHP Plan Submitted May 2015 ( , subp. 1) Approved Review Notice Received 4

5 PART 2 EXECUTIVE SUMMARY The City of Walker has 5 municipal wells presently operating. Wells 1,2 and 3 (241600, and respectively) serve the main infrastructure of the City (Walker East). The City developed an area southwest of the main part of the city and constructed a separate municipal supply [Wells 4 and 5 ( and )] and infrastructure that serves only the Industrial Park lots (Walker West). This portion of the wellhead protection (WHP) plan for the City of Walker includes: the results of the Potential Contaminant Source Inventory, the Potential Contaminant Source Management Strategy, the Emergency/Alternative Water Supply Contingency Plan, and the Wellhead Protection Program Evaluation Plan. Part 1 of the wellhead protection plan presented the 1) delineation of the wellhead protection area (WHPA) and the drinking water supply management area (DWSMA) and 2) the vulnerability assessments for the City s wells and the aquifer within the DWSMA. Part 1 of the WHP plan was submitted to the Minnesota Department of Health (MDH) and approved on November 18, The boundaries of the WHPA/DWSMA are shown in Figure 1. The vulnerability assessment for the aquifer within the DWSMA was performed using available information and indicates that the aquifer used by the City of Walker is considered to have a high vulnerability to contamination in both DWSMA s. A foot sandy-clay till cap is the only low permeability materials covering the aquifer in several areas. Through isotopic analyses and the attempt to correlate stratigraphy from well logs in the region, the aquifer is considered to be within a leakyconfined system. Recharge influence from local water bodies was not substantiated. Therefore, at this time, the aquifer recharge is assumed to come from precipitation infiltrating the glacial outwash aquifer described in Chapter 1. Because of the high vulnerability rating the plan focuses on identifying all potential contaminant sources within the DWSMA that could impact the City of Walker s wells. This information was presented to the City during the Second Scoping meeting held with the MDH on December 11, 2013, when the necessary requirements for the content of Part 2 were outlined and discussed in detail. In Chapter 1, the required data elements indicated by MDH in the Scoping 2 Decision Notice are addressed, as well as the data s degree of reliability. Pertinent data elements include information focusing on the physical environment, water resources, land use, public utility services, groundwater and surface water quality and quantity. The data elements and information supplied in Part 1 of the WHP Plan Amendment are based on the assessment that the aquifer providing drinking water for the both City PWS systems is highly vulnerable to contamination from land uses, such as other wells that penetrate the same aquifer and land uses that either store liquids in tanks or dispose of liquids below the land surface. The Potential Contaminant Source Inventory (PCSI) is a survey of all contaminants that may have the possibility of impacting the PWS wells and is described in Chapter 1. The plan will focus on those potential contaminants that pose the greatest threat to the PWS such as hazardous waste generators, private wells, storage tanks, stormwater ponds and turf management are of concern due to the high vulnerability of the aquifer. Chapter 2 addresses the possible impacts that changes in the physical environment, land use, and water resources have on the PWS. Marginal growth is anticipated within the next ten-year period. The City of Walker has evaluated the support necessary to implement its wellhead protection plan. 5

6 The problems and opportunities concerning land use issues relating to the aquifer, well water, and the DWSMA and those issues identified at public meetings, are addressed in Chapter 3. The high vulnerability status of the aquifer and the good quality of water currently produced by the City s wells leaves these major concerns to be addressed by this plan: 1) other wells located within either of the DWSMA s that could become pathways for contamination to enter the aquifer; 2) the pumping effects of high-capacity wells that may alter the boundaries of the delineated WHPA, reduce the hydraulic head in the aquifer, or cause the movement of contamination toward the public water supply wells; 3) underground or above-ground storage tanks that may release contaminants into groundwater; 4) shallow disposal-type wells; 5) commercial and household hazardous waste generators; 6) transportation corridors where an accidental spill could threaten the public water supply wells and 7) turf management which would reduce the impact of high nitrogen and / or pesticides and herbicides and stormwater that transport these contaminants. Stormwater is a high-priority concern for the City. Problems with ponding and streets flushing with little to no filtration prior to emptying into Leech Lake occur during high volume storm events and a stormwater outlet within the Inner Well Management Zone of Well 1 both create potential water quality issues. The City will pursue a Stormwater Assessment Plan and hopes to update the present system. The drinking water protection goals that the City of Walker would like to achieve with this plan are listed in Chapter 4. In essence, the City would like to maintain or improve current water quality and ensure protection of the public water supply. The objectives and action plans for managing potential sources of contamination are contained in Chapter 5. Actions aimed toward educating the general public about groundwater issues, gathering information about other wells, collecting data relevant to wellhead protection planning and effectively managing potential contaminant sources to minimize impacts on the aquifer are the general focus. Chapter 6 contains a guide to evaluate the implementation of the identified management strategies of Chapter 5. The wellhead protection program for the City of Walker will be evaluated on an annual basis prior to the City s budgeting process. An emergency/contingency plan is included to address the possibility that the City s water supply system is interrupted due to either emergency situations or drought. Chapter 7 contains details about the water supply distribution system, emergency contact numbers, equipment listings as well as other information to assist the City in responding quickly and effectively in emergency situations. 6

7 Figure 1: City of Walker Drinking Water Supply Management Areas, (Walker East and Walker West) 7

8 Figure 2: Walker East Vulnerability Wellhead Protection Area and Drinking Water Supply Management Area 8

9 Figure 3: Walker West Vulnerability Wellhead Protection Area and Drinking Water Supply Management Area 9

10 CHAPTER ONE DATA ELEMENTS, ASSESSMENT ( ) Vulnerability Assessment for the Walker Well Fields East and West The City of Walker has two well fields serving as the Public Water Supply (PWS). Wells 1-(241600), 2-(241951) and 3-(625355) serve the Primary portion of the City (Walker East) and Wells 4-(715179) and 5-(715180) serve the Industrial Park (Walker West), Figure 1. Drilling records from the City wells and available local wells were used to define the modeling program used in Part 1 of the Well Head Protection Plan (WHPP) (Lund, 2013). The presence of tritium found in both well fields ranging from 6.5 tritium units (TU) to 15 tritium units over the last 8 years suggests a rapid infiltration to the aquifer. The model suggests that the clay-rich confining unit over the aquifer is not continuous and therefore does not provide a substantial layer to prevent contaminants from reaching the aquifer. These issues along with the presence of low levels of volatile organic compounds found in City Wells 1 and 2 constitute a very high vulnerability assigned to the East and the West Drinking Water Supply Management Areas (DWSMA), Figures 2-3. I. REQUIRED DATA ELEMENTS A. Physical Environment Data Elements-- 1. Precipitation - Tritium analysis, a determining signature of nuclear testing fallout, is a relative measurement of the aquifer recharge rate. Tritium levels below 0.8 TU are considered pre-1953 water old water which supports a slower recharge rate and a longer time for contaminants to reach the aquifer, and levels above 0.8 TU are considered post-1953 water young water which supports a faster recharge rate and a shorter time for contaminants to reach the aquifer. The high vulnerability rating on the well fields directly correlates with the possibility of precipitation infiltrating and acting as a vehicle for contaminant transport in a relatively short time. Precipitation gauging stations in the area are Walker Ranger Station, Cass Soil and Water Conservation District and Ah-Gwah-Ching Center. Table 1: Five-year historical average of rainfall is inches per year. Data gathered from the Minnesota Climatology website, mostly from the gauging station at Ah-Gwah-Ching Center. Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total Geology - The City of Walker is located at the end of a glacial outwash channel that includes several ice-block lakes connected by a creek (the Lake May Creek chain), trending to the northeast and eventually discharging into Walker Bay. An outwash channel is formed from glacial meltwater cutting through glacial deposits and carrying the deposits to a discharge point. The Lake May Creek outwash channel is assumed to have originated beneath the Wadena Lobe (Wright, 1972). The meltwaters eroded the clay-rich upper layers of the Itasca Moraine and the channel was then backfilled with sand and gravels. As the process continued, basal melting of the glacier caused water flow to reverse from a southwest direction to a northeast direction as it continues presently, discharging into Leech Lake. 10

11 Aquifer continuity in complex glacial moraine is difficult to establish. Due to the lack of and the verifiable placing of wells in the area, aquifer thickness, extent and variability are unknown. Through isotopic analyses and the attempt to correlate stratigraphy from well logs in the region, the aquifer is considered to be within a leaky-confined system (Walsh 2002, 2007). This constitutes a confining layer that is not consistent in thickness and has areas where water can permeate and travel or recharge the lower aquifer more readily. Groundwater flow is generally north and east towards Leech Lake. City wells 1,2 and 3 were constructed at the end of the outwash channel near the shores of Leech Lake. City wells 4 and 5 were constructed on the west moraine of the main outwash channel. Although higher in elevation than the primary city well field, wells 4 and 5 still lack a substantial confining unit thickness. 3. Soils - Soils play an important role in contaminant attenuation and slowing the infiltration of harmful contaminants into an aquifer. The predominant soils within both DWSMA s are classified as the Menahga series (Exhibit 1). A loamy, coarse sand that is excessively to well-drained, has rapid permeability and moderate runoff capability. Typic Udipsamment and Arenic Eutroboralfs series constitute small areas in the north and west portion of Walker West and these soils are moderately well to poorly drained with a moderate permeability. The eastern fringe of the Walker East DWSMA is of the Warba series. These soils are a sandy loam, well-drained and have a moderate to low permeability. There is also an area of Histosols in the western portion of this DWSMA. These are generally depressional areas that are high in organic matter, very poorly drained and have a slow permeability. Examination of the City well logs shows very limited capability for lower strata layers to impede infiltration (e.g. limited to nonexistent confining layers below the foot clay-rich cap). Predominant sand layers with only limited clay stringers, increase the chance that any contaminant leaching through the soil layer may enter lower aquifers. Further complication results when the top sand-clay loam and the underlying clay-till soil parent material are removed, exposing the sandy layers below. There are no known soils with erosion causing sedimentation problems. 4. Water Resources - This data element applies as it relates to future groundwater uses that may influence the ability of the aquifer to yield water to the public water supply. Increased water usage may result in a reduction of aquifer yield or increase the likelihood that contaminants of human or natural origin may affect the quality of the drinking water. Leech Lake and Lake May are Department of Natural Resources (DNR) public, protected waters. No Federal Emergency Management Agency designated floodplains or public drainage systems are located within either DWSMA. The City controls shoreland within the City limits. Shoreland classification for Leech Lake from west to east goes from General Commercial Waterfront to Transitional Commercial Waterfront to Traditional Residential and then City Park. Lake May is designated as Low Density Residential within the Walker East DWSMA. Isotopic analyses, verification of well locations and correlation of new well logs should provide a better understanding of any influences between surface water bodies and the aquifer that the City of Walker uses for the Public Water Supply. Increased water use may result in a reduction of aquifer yield or increase the probability of contamination from human or natural origin. Groundwater flow is north and east towards Leech Lake that serves as a hydrologic boundary where the lake is sufficiently deep as to occur below the stratigraphic base of the clay-confining unit (Walsh, 2002). The aquifer does not show a strong component from local water bodies. 11

12 C. Land Use Data Elements 1. Land Use The City of Walker administers land use controls within its boundaries and a zoning, political boundary map is included in the Appendix as Exhibit 2. Land use controls outside the city limits of Walker are within Shingobee Township and fall under Cass County control. Walker West: The landuse that is within this DWSMA is presently forested city lots available for industrial/commercial development in the north portion of the DWSMA and low-density residential in the south portion of the DWSMA. A comprehensive landuse map and table are included as Exhibit 3. Existing natural ponds are presently sufficient for trapping and filtering runoff water. As more available lots are developed, installation of man-made stormwater retention ponds will be required. Placement of these ponds should take into consideration providing the least impact to the City wells 4 and 5 capture zone. Walker East: This DWSMA runs through the main portion of the City of Walker. Landuse is from low-density to transitional residential in the southwestern portion. The Walker-Hackensack School and Athletic Fields are in the central portion. Transitional Commercial and Central Business District in the northwestern portion and the City wells are located on Park and Recreation land on the northeastern portion. A comprehensive landuse map and table are included as Exhibit 4 There is one constructed stormwater pond on the eastern edge and a natural depressional area in the western portion that has low permeability soils (Histosols) that serves as a natural detention pond. The steep-gradient topographic relief from the southern portion of the DWSMA to Leech Lake in the north is significant. Presently there are not enough existing stormwater features to retard or retain runoff during high volume precipitation events. This allows runoff to pick up and transport potential contaminants directly through the Inner Well Management Zone (IWMZ) of the PWS. 2. Public Water Supply Wells- Landuse and management of the Inner Wellhead Management Zone (IWMZ, defined as a 200 radius around each of the City of Walker s Wells) were discussed and considered in the development of this Plan. This is done to identify the highest priority issues with the most immediate consequences or impact upon the public water supply wells. The City with assistance from the Minnesota Department of Health (MDH) has updated the IWMZ forms as part of Plan preparation. No major concerns were identified within these areas and management strategies to address any potential contaminants found are addressed on the respective IWMZ form (Exhibit 5). City staff will continue to monitor changes within the IWMZ as part of plan implementation. This information is used to support Chapter 7, which details an emergency/conservation plan. 3. Public Utility Services- Records of well construction and maintenance apply to this portion of the plan. Wells 1 and 2 were initially constructed with a gravel pack and were reconstructed in Thirty feet of the gravel pack were removed and replaced with grout and an outer casing. Both PWS wells now meet construction standards and based on the quality and quantity of the water supplying the City, no immediate problems are foreseen. This information is used to support the development of Chapter 7 of this plan. Locating and assurance of the proper sealing of old municipal wells is another focus of the Wellhead Protection Plan. The table generated by MDH for the City of Walker lists 9 water supply entries: the 5 present day wells, the initial water supply from an intake into Leech Lake and the 3 original wells located within 30 feet of the lake that were drilled in the early 1920 s (Exhibit 6). Researching the pdf file accompanying the table, a MDH Report on Investigation of Water Supply dated August 26,

13 states the old wells and triplex pump have been disconnected from the system and the casings properly sealed. City staff will work with MDH unit to try and locate and verify that the original 3 wells used by the City are sealed properly. A local well drilling company that has been in business for generations in this area, states that these wells were sealed, although no sealing records can be found. Management strategies will address the potential contaminant inventory and the assurance that all old municipal wells are sealed to code. Only one resident is on private well and septic the remaining portion of both DWSMA s are served by City water and sewer. The infrastructure contains no interconnects. All infrastructure maps are available at City Hall. Public drainage system maps are available at City Hall. No gas or oil pipeline exists within either DWSMA. All properties hooked up to the city water within both DWSMA s are metered. Major transportation corridors such as Industrial Park Boulevard within Walker West and Highway 371 that runs along the northern border of Walker East in close proximity to Wells 1,2 and 3 present the possibility of an accident involving a fuel or chemical spill. 3. Potential Contaminant Source Inventory- The City of Walker and WHP Team completed a potential contaminant source inventory (PCSI) focusing primarily on wells and tanks located in the DWSMA. The inventory was done based on the high to very-high vulnerability determination described in the first part of the WHP Plan. Other significant potential contaminants were also considered such as other large chemical and petroleum sources, leaking underground storage tanks, pipelines, flooding, spill sites and superfund sites that may pose a threat to the wells or aquifer. A map and spreadsheet of potential contaminants identified within each DWSMA are found in Exhibit 7. As part of the potential contaminant source inventory process, prioritizing management strategies and activities to protect the City wells and aquifer were considered. Based on the results of the inventory, high priority was given to other wells that may penetrate the same aquifer used by the City, or at least provide a conduit for easy contaminant transport to a partial depth of the aquifer. Stormwater control is a priority due to the substantial topographic relief from the southern end of Walker East to Leech Lake on the northern boundary. Another area of concern is some of the large, old fuel-oil tanks in close proximity to the City Wells in Walker East. The City will explore options available to address these concerns and management strategies are included in Chapter 5 of this Plan. C. Water Quantity Data Elements 1. Surface Water Quantity Surface water bodies recharging the aquifer used by the City has not been substantiated. It is assumed that groundwater discharges to local surface water bodies. Continued isotopic analyses will determine any interrelationships. There are no known water use conflicts due to pumping or other causes. 2. Groundwater Quantity -- Groundwater levels are adequate and there appears to be sufficient groundwater quantity, based upon the existing pumping capacity of wells completed in the aquifer used by the City. There are no known well interference problems or water use conflicts. A summary and breakdown of the well field pumping rates, withdrawals, and percentage of contributions are located in Table 2 of this Plan. 13

14 D. Water Quality Data Elements 1. Surface Water Quality Although the aquifer used for the PWS is not considered to be influenced by local water bodies, the surficial aquifer is assumed to be in direct hydraulic connection to the Lake May chain of lakes and Leech Lake. Cass County oversees compliance of local lakeshore ordinances outside the Walker city limits such as maintaining vegetative buffer zones and educating residents on turf management to help ensure that the water quality does not deteriorate in this chain of lakes. Walker West has sufficient natural stormwater detention ponds for the present level of development. Future development may require construction of more stormwater ponds to ensure runoff is contained and retention of potential contaminants increased. Walker East has 3 constructed stormwater detention ponds and a sizable natural depression in the western portion. However, the city is concerned that more may be required to effectively reduce sediment and nutrient transport for the business district and the stormwater outlet adjacent to City Wells 1 & Groundwater Quality-. Tests conducted by MDH have revealed the presence of tritium, indicating there is some component of young water recharging the aquifer within the capture zone of both public water supply systems. As such, there is a high probability that current land use has a direct impact on the quality of drinking water in the majority of both DWSMA s. Additional groundwater quality information should be collected over the ten-year life of the plan. The City of Walker has consistently provided good water quality to the consumers and a Consumer Confidence Report is on file at City Hall. Changes in the general chemistry of the well water may indicate that the aquifer is receiving recharge from different pathways, such as improperly constructed or sealed wells or through different geological materials. The Walker West Class V Septic System is within 300 feet of the City wells and the system s drainfield runs parallel to the well capture zone. During the development of the Wellhead Protection Amendment in 2008, concern over this potential problem initiated a regular monitoring of Wells 4 and 5. Results indicated signs of human influence in the forms of chloride and nitrates at increasing rates in the public water supply. Continued monitoring showed increasing concentrations of these indicator ions. It was discovered that the Class V Septic System s gates were not operating properly. All discharge was releasing from one gate, and that one was closest to the City Wells. Once the gate system was operating properly, the concentrations of these indicator ions decreased. Although monitored closely, this appears to no longer be a threat. II. ASSESSMENT OF DATA ELEMENTS A. Use of the Well - General information describing this public water supply system is summarized in the table below. Table 2: Summary of production for City Wells. Well # Unique # Cased size inches Cased depth feet Pump rate gal Pump rate gal Pump rate gal ,421,000 31,248, ,200, ,976, ,200,000 40,515, , , , , , ,000 14

15 B. Quality and Quantity of Water Supplying the Public Water Supply Well Walker East pumps approximately 70 million gallons [mgal] annually. Total volume pumped from wells 4 and 5 in Walker West annually is 1.2 mgal annually. At this time quantity of water is not perceived as a problem, since demand does not exceed potential pumping rates. The quality of the City of Walkers finished water is within Federal Safe Drinking Water Act Standards in both well fields. The City is taking a proactive approach to any potential problem, will continue to monitor the water quality on a regular basis and are developing source of actions to alleviate any future potential problems with water quality for wells 4 and 5. Walker East has formerly shown evidence of low levels of volatile organic compounds. The original WHPP Part 2 (May 2004) does raise an important issue that Wells 1,2 and 3 are in close proximity; therefore, if a major contamination event occurs, all wells will most likely be affected. Wells 4 and 5 in Walker West are also in close proximity and could have the same outcome. C. The Land and Groundwater Uses in the DWSMA - Proactive management of the Class V Septic System, existing wells and private septic systems, stormwater ponds, above and below ground tanks, known and unknown petroleum release sites, transportation corridors, landscaping, turf chemical applications, shallow disposal wells, and commercial and household hazardous waste generators are of immediate concern due to the high vulnerability of the aquifer. The City s Industrial Park Class V septic system has a capacity of 5000 gallons per day, is permitted by Cass County and regulated by the Environmental Protection Agency (EPA). Walker East is all within the city limits and usage ranges from low density residential to the central business district. No shallow disposal wells were identified in the DWSMA. Also see the Appendix for additional information and maps for the PCSI. 15

16 CHAPTER TWO IMPACT OF CHANGES ON PUBLIC WATER SUPPLY WELLS ( ) I. CHANGES IDENTIFIED IN: A. Physical Environment- Large-scale changes in the physical environment within both DWSMA s are not anticipated during the 10-year period that this Plan is in effect. Due to the topography in Walker West, the sale of empty lots within the Industrial Park will require small-scale changes for the leveling of the lot to provide a suitable building site. However, the geologic conditions that protect the water supply are such that changes in the physical environment could have an effect on the aquifer within the DWSMA. Direct routes through these geologic conditions, or the limited confining layer over the City wells (e.g. unidentified abandoned wells and / or underground storage tanks or loss of topsoil) could potentially impact the aquifer and groundwater quality. Walker East has been developed for some time and not much change is expected from the current zoning regulations. Walker West has open light-commercial lots for development on the north end and low-impact residential on the south end upgradient from the City wells. B. Land Use- Land uses within Walker East are regulated by the present City Zoning Ordinances. The present residential and commercial uses are stable and future changes would be within zoning regulations. Commercial property that allows underground or aboveground storage tanks or requires a Hazardous Waste Generating Permit within the DWSMA should be addressed in a comprehensive land use plan and associated zoning requirements. Future zoning should address commercial properties requiring these potentially contaminating sources to locate outside the main portion of the City. Anticipated changes of land use in the Walker West DWSMA will most likely consist of new lowdensity residential in the southern portion and commercial/industrial development of the remaining empty lots in the northern portion. The City manages growth and development through local land use controls. Future industrial and commercial growth will be considered in relationship to the impact on the City s wells and the aquifer. C. Surface Water Isotopic analyses recommended by MDH will determine the existence of a hydraulic connection between surface water and the aquifer used by the City as a drinking water source. Dependant upon the results, any changes to the conditions of surface waters could have an impact on the quality or quantity of the public water supply. D. Groundwater- The City wells have historically provided groundwater of excellent quality and quantity. As of the date of Plan approval, the City does not anticipate a large increase in water use or is not aware of any such water use expansions in either DWSMA or the immediate adjacent area. Walker West has a brewery that could potentially expand in the future. No other high capacity water users or changes thought to impact the quality or quantity of the PWS have been identified at this time. II. IMPACT OF CHANGES A. Expected Changes in Water Use- The City does not anticipate that water use will increase by more than five-percent during the first five years of this Plan. Modest amounts of land are available for future commercial / industrial development in Walker West. Walker East is mostly developed. 16

17 B. Influence of Existing Water and Land Government Programs and Regulation- Recognizing that the State Well Code has sole authority in permitting wells, there may be some existing land use ordinances by the City of Walker, and Cass County that could be revised in the future to address new private wells, storage tanks or shallow disposal wells within the DWSMA s. Land development outside the city limits in Walker West is controlled by Cass County. The City will work with Cass County to ensure that these areas outside of city control are developed with the vulnerability of PWS addressed. The City discourages the construction of new wells within the City limits and has ordinances in place requiring consumers to hook up to City water and sewer where available (Ordinance Sewer and Water). There are no known unused/unsealed wells within the DWSMA. In the advent that information leads to discovering a well of this type appropriate measures will be taken to seal the well, and cost share opportunities from county and state agencies will be explored. The City of Walker relies on the Minnesota Pollution Control Agency (MPCA) for the registering of storage tanks, Cass County administers septic controls and the EPA regulates the Class V septic system. C. Administrative, Technical, and Financial Considerations- A Wellhead Protection Team was assembled early in the process of developing this Plan. Many of the activities during the planning process have been accomplished through efforts of this group (Exhibit 8). For this Plan to be effective: 1. The City will need to raise public awareness of the issues affecting the quality or quantity of its drinking water supply through public educational programs. 2. Administrative duties will remain with the Wellhead Protection Manager who will report to the City Council, coordinate implementation of the wellhead protection management action plans, and conduct regular meetings. 3. Implementation of Wellhead Protection activities will be provided by budgeting through the general fund and grant funds available through MDH. Other sources of funding or in-kind services to help achieve the goals set forth in this Plan s Chapter 4 include: 1) the MDH will assist with determining the correct measures for sealing unused wells, constructing new wells, and requiring the sealing of unused wells if this becomes necessary; and 2) the MDH will provide technical assistance during the wellhead protection implementation phase. 4. The plan will be evaluated on an annual basis prior to the City s budgeting process to determine whether the original cost estimates match 1) the scope of the management practices identified in this part of the Plan and 2) changes in the status of the private wells. The City of Walker will discuss changes in plan implementation costs with MDH to determine the availability of state or federal funding for offsetting increased costs to plan implementation. 17

18 CHAPTER THREE ISSUES, PROBLEMS, AND OPPORTUNITIES ( ) I. LAND USE ISSUES, PROBLEMS, AND OPPORTUNITIES RELATED TO: A. The Aquifer The highly vulnerable aquifer, identified as the source of the City of Walker s water supply for these well fields, has maintained an adequate supply and a high quality of water. As discussed above, the tritium values found in the City wells and the computer model suggest that at least some of the recharge entering the aquifer is from recent water infiltration. The predominant Menahga soils have relatively high permeability and are well to excessively drained. This suggests that infiltration rates are relatively high. The modeled capture zones for these wells are elongated implying relatively rapid travel times throughout the aquifer media. Best management practices within these highly vulnerable areas should be encouraged, as travel time from the surface to the City s public water supply is relatively rapid. Observing well construction records of the City well s reveals very limited if any confining layer other than the foot surface sandy-clay till cap present. Once this cap is removed, thin gravel and sand layers are the only available source to attenuate contaminants from reaching the aquifer. Although attenuation is generally sufficient by sand / silt layers, saturation of contaminants can be reached over long periods of time. B. The Well Water- The wellhead protection plan, due to the high vulnerability described above, is concerned with all potential contaminant sources located within the DWSMA. The PCSI performed by the WHP team and consultant indicated the types of wells, tanks and other potential contaminants within the DWSMA (Exhibit 7). Some of the wells may extend into the aquifer that is used for the public water supply. These wells, if improperly constructed or maintained, could transport pollutants to the aquifer. The WHP team did identify monitoring wells that were potentially not sealed around Hardee s. Upon removing the safety covers and inspecting the wells, it was determined that these wells were indeed sealed and just left in place rather than cementing over within the drive-through and parking lot. Two new monitoring wells were installed for the LUST site 18928, for a total of four within Walker East. The placement of any additional high-capacity wells, increased pumping from existing wells, or significant changes in current pumping rates within the DWSMA may have an impact on 1) groundwater availability to all users, 2) increased risk that contamination may enter the part of the aquifer used by the City, or 3) change the delineated WHP area and the DWSMA boundaries. The City of Walker will work with the DNR and MDH to become aware of any proposed high capacity well in close proximity to the DWSMA. The City will work with all present and future well or Subsurface Sewage Treatment System (SSTS) owners to minimize or eliminate potential impacts. C. Underground and Aboveground Storage Tanks No storage tanks presently exist in Walker West. There is 1 gas station, 4 commercial fuel storage tanks and 22 private fuel storage tanks within Walker East. Some of these are aging and have no secondary containment. The City will educate tank owners on responsible best management practices to help ensure spills are reported and cleaned up quickly. The City will monitor future developments to ensure that any tanks proposed within this area do not jeopardize the PWS. 18

19 D. Shallow Disposal Wells The Class V Septic System located within Walker West was initially problematic. However, once the system was operating properly, indicator ion concentration decreased and there is presently no reason to suspect this to be a threat to the City Wells 4 and 5. The City will continue to be proactive in monitoring this system. There is no other known Class V or other types of disposal wells located within either DWSMA. However, the City does have links on their website on Shallow Disposal Wells and options for proper disposal and EPA reporting requirements. E. The Drinking Water Supply Management Area - A primary concern expressed by the City of Walker is to ensure consistent and long-term management of water wells, environmental bore holes, and observation wells. The City has limited legal capabilities to regulate well construction and sealing in the DWSMA. Second, changes in land use that increase pumping of the aquifer used by the City s wells need to be assessed for the possible impacts on water availability and quality. Finally, the City has no regulatory authority over water appropriations and must rely on the State of Minnesota to address issues and concerns related to pumping. The City will explore implementing additional ordinances for land use controls related to managing wells and storage tanks, increased future development and the potential impacts that these pose on the public water supply wells. The City is considering conditional use permits for large-scale excavation of lots under development for building sites for Walker West. The City should highly discourage any business that generates excessive hazardous waste, requires installation of large fuel or chemical tanks and / or whose high capacity water usage has the potential to affect well capacity in either DWSMA by conditional use permitting or other options available. Presently, Walker West has sufficient natural stormwater detention ponds. However, future development of lots where natural ponds do not exist will require the City to determine the best location with the least impact on the public water supply. Walker East has 3 constructed stormwater detention ponds and a sizable natural depression area that serves the same purpose. However, potential water quality issues still exist. Due to topographic relief, the main portion of the City still has issues when high precipitation events occur. Stormwater pools in the downtown business district requiring pumping without available treatment. Also, discontinuous confining layers over the aquifer used by the City cause concern since stormwater transporting potential contaminants flows directly through the IWMZ of Well 1, with the outlet discharging into Leech Lake adjacent to the water treatment plant. F. Providing Funds to Conduct Requirements of the Well Head Protection Plan- The City understands the importance of providing good quality and quantities of water for consumption and strives to maintain present conditions. Cities already face obstacles in balancing budgets. Staff time and incidental costs of this un-funded mandate add a financial burden to an already stressed budget. For these reasons, the City will utilize existing and future grant funding opportunities to advance the WHP Plan implementation. II. IDENTIFICATION OF: Problems and Opportunities Disclosed at Public Meetings and in Written Comments A. Local Units of Government- At the beginning of the planning process other Local Units of Government (LUGs) were identified and informed that the City was beginning the wellhead protection planning process. (Exhibit 9) Each unit of government was also sent a copy of the City s delineated WHPA s and DWSMA s and vulnerability assessments. To date, no comments from the LUGs have 19

20 been received. The general public was also given opportunities to participate in the planning process and to comment. No concerns from the general public have been expressed at this time. B. Data Elements- The first part of this WHP Plan describes regional and local geologic conditions used to assess and determine aquifer and well vulnerability to surface or near surface contamination. Continued cooperation and data collection with the MDH will increase knowledge of the aquifer in the complex moraine system. C. Status and Adequacy of Official Controls, Plans, and Other Local, State, and Federal Programs on Water Use and Land Use - The City of Walker WHP Team is confident that local issues may be adequately addressed through existing programs and local planning processes. These include: public education, adoption of best management practices for managing wells and tanks, monitoring, water conservation, good communication with landowners in the DWSMA and implementing and improving of local city and county ordinances. Cass County Environmental Services through the Local Water Plan, shoreland ordinance and the County SWCD have been identified as important partners and a resource for landowner assistance. The MDH SWP Grant and other grant opportunities will be explored to assist the city in the implementation of this plan. There are many tools available to the regulating agencies that may be used to achieve the wellhead protection planning goals identified by the WHP Team. State and local governmental units, such as MDH, DNR, MPCA and Cass County regulate: Table 3: Official controls, plans and other Local, State and Federal Programs Government Unit MN Dept. of Health (MDH) MN Dept. of Natural Resources (DNR) MN Pollution Control Agency (MPCA) Environment Protection Agency (EPA) Type of Program State Well Code Wellhead Protection Program Water Appropriation Permits Storage Tank Program Petroleum Release Program Stormwater Program Shallow Disposal Well Program Brief Program Description MDH has sole authority over the construction of new wells and offers technical assistance for sealing unused, unsealed wells. In addition, MDH administers the Safe Drinking Water Act. MDH has staff that will assist the city with identifying technical or financial support that other governmental agencies can provide to assist with managing potential contamination sources. DNR can require that anyone requesting an increase in existing permitted appropriations or to pump groundwater must address concerns of the impacts to drinking water if these concerns are included in a WHP plan. MPCA administers the programs dealing with storage tank regulations, petroleum release and stormwater management. EPA has the regulatory authority over Class V Injection Wells or also known as Shallow Disposal Wells. 20

21 Government Unit Cass County Environmental Services Department Type of Program Household Hazardous Waste Collection. Land-use and Water Planning Class V Septic System Subsurface Sewage Treatment Systems (SSTS) Brief Program Description Provides education to landowners and an annual collection program for disposing of household hazardous waste. Establishes countywide goals and priorities towards protecting water resources. Permitting is under Cass County authority 21

22 CHAPTER FOUR WELLHEAD PROTECTION GOALS ( ) The overall GOAL of the City of Walker Wellhead Protection Plan Amendment for the Walker West and Walker East DWSMA s is to promote public health, economic development and community infrastructure by maintaining a potable drinking water supply for all residents of the community, and employees, both now and into the future. The water supply is located underground and is classified as vulnerable. Consequently, this program will focus on managing the potential contaminant sources identified, in order to prevent possible well contamination. The water suppliers have historically enjoyed a sufficient and safe water supply, and propose, through the implementation of this WHP Plan, to continue supplying safe, potable water for its residents and employees into the future. The wellhead protection program will achieve these stated goals through existing and planned programs, such as: Public Education & Information Best Management Practices Well Sealing Programs (if any are identified in the future) Hazardous Waste Collection Programs Emergency Response Procedures Petroleum Release 22

23 CHAPTER FIVE OBJECTIVES AND PLANS OF ACTION ( ) ESTABLISHING PRIORITIES -- The aquifer providing water to the public water supply system has been identified as having a high to very-high vulnerability to contamination from land use activities. The following objectives have been identified to support the goals of the WHP plan for the Public Water Supplier: 1. Create awareness and general knowledge about the importance of WHP in the City of Walker. 2. Properly inventory and manage potential contaminant sources to protect the drinking water supply for the City of Walker. 3. Effectively track and report the implementation efforts and wellhead protection plan progress to all governing authorities. 4. Manage the Inner Wellhead Management Zone to prevent contamination of the aquifer near the public supply wells. 5. Effectively prepare the City of Walker for disruptions to the water distribution system. A number of factors must be considered when WHP measures are selected and prioritized (part , subpart 3). Such factors include: Contamination of the PWS wells by substances that exceed federal drinking water standards Quantifiable levels of contamination resulting from human activity Location of potential contaminant sources relative to the wells. Number of each potential contaminant source identified and the nature of the potential contaminant associated with each source The capability of the geologic material to absorb a contaminant The effectiveness of existing controls The time required to get cooperation from other agencies and cooperators The resources needed: staff, money, time, legal, technical Based upon these factors, the Wellhead Protection Team will concentrate management efforts on the following categories and subsequent strategies to create awareness about groundwater protection and help prevent future contamination of the aquifer: A. Public Education B. Tank Management C. Hazardous Material Management D. Wells (Well Management) E. Transportation Corridor Management F. Turf Management G. Stormwater Management H. Class V Septic System, Class V Disposal Wells I. Subsurface Sewage Treatment System (SSTS) Management J. Unknown Potential Contaminant Sources K. Updating the PCSI L. Data Collection (MDH Recommended) M. WHP Recognition and Planning 23

24 A. WHP EDUCATION: Work on establishing a line of communication between the citizens and the City for education on land use activities and the potential impact on local water quality. Implementation Action Items Implementation Time Frame Action # Description Priority Responsible Party & Cooperators Cost Update Plan 1 Compile existing fact sheets that address a variety of land use best management practices and other source water protection information. These existing fact sheets can be obtained through Cass county, MDH, MPCA, MDA, MRWA Online Tool and County Extension. Contact your MDH planner for assistance. The fact sheets and other source water protection information will be available at City Hall and/or through links on the City website. Items to include but not limited to: Importance of well sealing and available cost-share funding (MDH, MDA, MRWA, SWCD) Proper well maintenance for private well owners (MDH & MRWA) Household hazardous waste (Cass County) Information on Class V wells (MDH, MRWA, MPCA) Current Consumer Confidence Report (City) General source water protection information (MDH) Most recent annual WHP activities report (City) Copies of WHP articles or announcements (City) Proper Subsurface Sewage Treatment System Maintenance (MPCA) Very High WHP Team City Staff, MDH, MRWA, SWCD, MDA Cass Co. ESO $250 printing plus Staff Time X X X X

25 2 Sponsor a program of water related presentations for students, parents and the public during National Water Week. Conduct bi-annually depending upon interest. High WHP Team City Staff MRWA $200 plus Staff Time X X X X X 3 Include WHP information and updates as they become available in Newsletter, insert with utility billing or place on website. High WHP Team City Staff MDH, MRWA $250 plus Staff Time Annual Activity 4 Utilize brochures and fact sheets compiled in A-1 above for handing out during tours of the water and wastewater treatment facilities. High WHP Team City Staff Walker School Staff Time X X X X X 5 The City website already has several links and information on the WHP Plan and Implementation phase. Continue to add on and develop this vital resource. High WHP Team City Staff taff ime S T As updates are acquired 25

26 B. TANK MANAGEMENT: Registered and Private Storage Tanks, Petroleum Release Sites - Continue working with local tank owners and appropriate agencies to ensure that Best Management Practices are utilized and potential threats to the PWS are diminished. Implementation Action Items Implementation Time Frame Action # Description Priority Responsible Party & Cooperators Cost Update Plan Continue to identify the status of tanks within both DWSMA s. Open communication with future potential residents establishing the vulnerability and the importance of tank management. Request information on proposed tanks to be installed and consider Conditional Use Permitting. Communicate with MPCA via phone, or mail regarding present Leaking Underground Storage Tank (LUST) petroleum release sites and existing monitoring wells. Request that the City is notified of any new contamination sites or possible installation of new or sealing of existing monitoring wells. Distribute brochures and fact sheets compiled in A-1 above on Tank BMP s, to all residents included on the PCSI tank inventory. Encourage conversion to propane or natural gas when that becomes available. High High High WHP Team City Staff, Present and Future Residents WHP Team City Staff MPCA WHP Team City Staff MDH, MRWA Staff Time Staff Time $250 printing/mail Staff Time As new residents establish X X 26

27 C. HAZARDOUS WASTE MANAGEMENT - Provide commercial and household hazardous waste generator(s) from both City DWSMA s with information on proper handling of hazardous materials. Implementation Action Items Implementation Time Frame Action # Description Priority Responsible Party & Cooperators Cost Update Plan 1 Continue to support and work with Cass County on the household hazardous waste exchange day. High WHP Team City Staff, Cass County Staff Time Annual Activity 2 Mail or personally distribute information compiled in A-1 above to businesses with a HWG permit. Provide information on links to hazardous waste exchanges (e.g. MnTAP, etc.). High WHP Team City Staff MPCA MnTAP Staff Time X 3 Contact MPCA by phone, or mail and request that their website be updated on the following incorrect information: Hummingbird Press moved to another location and Ringle Otto Dds retired-both have Active Permits on MPCA website. Moderate WHP Team City Staff MPCA Staff Time X 27

28 D. WELL MANAGEMENT Ensure that all wells are managed properly with minimal impact to the PWS wells. Implementation Action Items Implementation Time Frame Action # Description Priority Responsible Party & Cooperators Cost Update Plan 1 2 Municipal Well Management : Inner Zone Management Activities (200 radius of public water supply wells) City staff will monitor for new potential contaminant sources and adhere to setback requirements within the IWMZ (200 ) of the PWS wells. If new contaminant sources are identified, staff will take steps needed to protect the public water supply wells. City staff will Implement WHP-IWMZ Measures specified and assist MDH in updating the IWMZ survey form every 3-5 years for all public supply wells. Very High High WHP Team City Staff MDH City Staff MDH Staff Time Staff Time X X X X X X X X X X X X X Municipal Well Management : Old Municipal Wells Research locations and status of old municipal wells listed in Exhibit 6 with the assistance of MDH. A local drilling 3a company has been active in the area for generations and states that the 3 wells were sealed. Medium WHP Team City Staff, MDH, Well Driller Staff Time X 3b If old municipal well locations are found and verified as not sealed, then seek SWP grants or other funding to have wells sealed to code. Very High WHP Team City Staff, MDH f Time 0,000 taf $ 1 S If well locations are found 3c If funding is received, have wells sealed to state code. V ery Hig h City Staff, MDH Staff Time If wells found and funding received 28

29 Other Wells: Properly manage present private well properties and identify any new wells proposed within the DWSMA s. Action # Description Priority Responsible Party & Cooperators Cost Implementation Time Frame Update Pl 4 Well Management information will be mailed to the present private well owner and future well owners for promoting proper management of existing and future wells. High WHP Team City Staff, MDH MRWA Staff Time X Ongoing as needed 5 The City will promote the sealing of abandoned wells within the DWSMA through the distribution of educational materials in the Newsletter and / or displayed at City Hall. High City Staff MDH, SWCD Staff Time Ongoing as needed 6a City staff will continually attempt to locate new, existing and abandoned wells within the DWSMA. This will be accomplished through direct contact with landowners and through observation in travel. High City Staff Staff Time Ongoing as needed 6b If an abandoned well is found, the City will encourage the landowner to seek funding to ensure the well is sealed. High City Staff Cass SWCD, MDH Time 50 2 Staff $ If abandoned well is found 6c Seal the abandoned well with approved funding or by other resources to ensure no contaminant enters the aquifer through this avenue. High City Staff Cass SWCD, MDH Staff Time $250 If abandoned well is found 29

30 High Capacity Wells: Ensure that no other high capacity wells affect the PWS. 7 Step. 1: Identify any new high capacity well that is proposed for construction in or within one mile of the DWSMA. Step 2: If a high capacity well is identified: contact MDH Hydrologist to evaluate the effect that proposed pumping may have on the WHPA boundaries, and work with MDH Hydrologist, DNR and high capacity well owner to reduce the threat to the PWS. Very High WHP Mgr. City Staff, MDH, DNR Staff Time Ongoing as needed E. TRANSPORTATION CORRIDOR MANAGEMENT: Continue communication with local early responders as to how vulnerable both DWSMA s are and that quick containment and clean up of hazardous spills is critical for the protection of the PWS. Implementation Action Items Implementation Time Frame Action # Description Priority Responsible Party & Cooperators Cost Update Plan Communication has been established through earlier WHP Plans and through work environments. Continue communication with local Emergency Response personnel with emphasis on the vulnerability of the City DWSMA s and that early response is critical for protection of the PWS. Continue to clean city streets as early as possible in the spring to reduce the amount of road salt, nutrients and associated sediments from reaching the lake. Mail MNDOT and the Cass County Highway Departments a map of the DWSMA s and request cooperation in reducing impacts to these sensitive areas from projects such as road salt application, construction and/or maintenance, chemical storage or use, etc. Very High High High WHP Team City Staff, Cass Co. Emerg Response Personnel City Staff WHP Team City Staff, MNDOT Cass Co Hwy Dept Staff Time taff iem S T Staff Tiem X X X X X X X X X X X X X X X X X X X X X 30

31 F. TURF MANAGEMENT: Inform the public on concerns with turf management and runoff within the DWSMA s. Implementation Action Items Implementation Time Frame Action # Description Priority Responsible Party & Cooperators Cost Update Plan 1 2 Include in annual Newsletter provided in utility mailing, suggestions and concerns about managing turf applications and potential runoff issues related to lawns, gardens and other open areas. Continue working with the School on proper use of nutrients and reduction in runoff. Ongoing as new issues or possible actions develop. High High WHP Team City Staff Property Owners WHP Team School Staff Time taff ime S T X X X X X X X X X X X X X X X X X X X X 31

32 G. STORMWATER ISSUES and MANAGEMENT: Work with City staff responsible for storm water management, plat approval, and building permits to ensure that new stormwater management structures are chosen with wellhead protection in mind, existing stormwater management structures are properly maintained, have appropriate permits, and industrial ponds are lined. Act as an information and referral source for developers, city staff, and industrial pond operators. Post at City Hall and include in Newsletter notices of upcoming training events, permit applications, and information about proper design and operation of stormwater structures. The Walker Zoning Ordinance requires on-site surface treatment of stormwater except in the downtown business district. This speaks to proper drainage control for minimizing the extent of runoff velocity and continuance of natural drainage ways. The downtown business district is exempt due to congestion of buildings, lot line to lot line coverage. The City suspects Walker East s stormwater structure requires updating due to potential water quality issues of ponding and a stormwater outlet within the IWMZ of Well 1. Implementation Action Items Implementation Time Frame Action # 1 2a 2b 2c Description Communicate stormwater concerns to city departments and staff during meetings or through /memo and post info at City Hall. Ensure that construction of additional storm water ponds follow Stormwater Pollution Prevention Plan (SWPPP) guidelines. Ongoing as new developments arise. Obtain estimates from consultants to conduct a Stormwater Assessment Plan for the City of Walker to address concerns of ponding and an outlet adjacent to Wells 1 &2. Apply for funding through MDH /SWP Grants (early spring application process), SWCD, MPCA etc. If economically feasible, dependent upon grants and other funding resources, conduct a Stormwater Assessment Plan. Priority Very High High High Very High Responsible Party & Cooperators WHP Team City Staff Cass Co SWCD, BWSR,MPCA City Staff MDH,SWCD MPCA City Staff MDH,SWCD MPCA City Staff Consultants SWCD MPCA Cost Staff Time taff ime S T Staff Time Staff Tiime $10, X Update Plan X X X X X X X X X X X X 32

33 MPCA 3a If the Stormwater Assessment Plan reveals that updates to the present system are required, seek estimates from consultants to update the present system. High City Staff Consultants Staff Time X 3b Apply for funding to update the system (MDH SWP Grants-Competitive Grants-Matching Funds, SWCD, MPCA Clean Water Revolving Fund or other sources). High City Staff MDH,SWCD MPCA Staff Time X 3c If economically feasible, dependent upon grants and other funding resources, update system based on Assessment. Very High City Staff Consultants SWCD MPCA Staff Time, Cost depends on updates required X 33

34 H. CLASS V SEPTIC SYSTEMS MANAGEMENT: The City will look at and work through all avenues to gain knowledge and properly manage the Class V Septic System drainfield for the City of Walker Industrial Park. The WHP Team and City staff will continue to look for other potential Class V septic/disposal systems within both DWSMA s. Implementation Action Items Implementation Time Frame Action # 1 2 Description Meet personally with all occupants of the Industrial Park addition stressing the importance that what goes down the drain goes into the community Class V septic system and the requirements for release of harmful contaminants must be adhered to stringently to protect the PWS. Step 1: Identify any potential Class V disposal systems in the DWSMA Step 2: If a Class V disposal system is identified, work with MDH Planner to provide the property owner with Priority Very High High Responsible Party & Cooperators WHP Team City Staff Property Owners WHP Mgr. City Staff, MDH, management or permitting options. I. Subsurface Sewage Treatment System SSTS Management: Proper maintenance of septic systems is crucial to ensure that discharge does not reach the aquifer through the discontinuous confining layer. Implementation Action Items Implementation Time Frame Action # 1 Description Contact the one private septic system owner either personally or by mail and give appropriate SSTS management information and again if ownership changes. Priority High Responsible Party & Cooperators WHP Team City Staff SSTS owner Cost Staff Time Staff Time Cost Staff Time X Ongoing, and as new lots are occupied Ongoing, as needed 2023 Update Plan Update Plan 34

35 J. Unkown Potential Contaminants: It is difficult to predict what potential contaminants could be found in the future. Keep aware of the possibilities and maintain a strategy to promptly alleviate the problems as they occur. Implementation Action Items Implementation Time Frame Action # Description Priority Responsible Party & Cooperators Cost Update Plan 1 It is always difficult to foresee or plan for the future. If a critical issue or potential contaminant threat arises in the future, the City will promptly take actions to prevent this source from polluting the PWS. Contact and work with appropriate agencies to resolve and remediate the potential contaminant problem. If economic hardship exists, apply for funding through MDH SWP Grant or other available funding to remedy the problem as rapidly as possible. Any action taken will be summarized in 2022 and submitted to MDH. Very High WHP Team City Staff MDH, MnTAP, EPA,PCA SWCD, ESO Staff Time Funds dependant upon problem X K. Updating PCSI and Management of New Sources: Monitoring and documenting any changes to the PCSI is crucial in maintaining the implementation process and makes development of the 10-year Amendment much easier. Implementation Action Items Implementation Time Frame Action # 1 2 Description Continue to look for new or unknown potential contaminants. Annually review land use changes and respond to potential threats as resources allow. Update the PCSI with information from strategy K-1 above and any other sources available in year 8 of this Plan. Priority V ery Hig High Responsible Party & Cooperators hwhp Team City Staff MDH, WHP Team City Staff Cost Staff Time Staff Time 2015 X X X X X X X X X X X Update Pl 35

36 L. Data Collection: MDH recommendations: Gather additional information from chemical / isotopic analyses of surrounding water bodies and the aquifer and/or other studies to gain knowledge of the City s aquifer characteristics and help refine computer model. Action # Description Implementation Action Items Priority Responsible Party & Cooperators Cost 2015 Implementation Time Frame Update Pl With the assistance of MDH, continue monitoring indicator ions (Nitrate, bromide and chloride ratios) in Walker West wells at least annually. MDH will provide sample bottles and cover analytical cost. City staff may have to collect the water samples. Conduct a standard assessment monitoring package to gain further information about the interactions of surface waters on the PWS aquifer. Quarterly sampling from Leech Lake, Lake May and the Primary City Wells would be necessary. MDH will provide sample bottles and cover analytical cost. City staff may have to do collection. If the Walker West is considered a good candidate by MDH, the City will explore the opportunity of being involved in a virus migration study for the Walker West well field. Contingent upon available outside funding and cooperation from MDH, conduct an aquifer test on Well 4 or Well 5 V ery Hig Very High High High hwhp Team City Staff MDH, WHP Team City Staff MDH City Staff MDH City Staff MDH Staff Time Staff Time taff ime S T StaffT ime X X X X X X X X X X X X If opportunity develops Contingent upon outside funding through MDH SWP Grant or other funding sources, install a meter on the effluent inflow to the Industrial Park drainfield and City wells 4&5 (if necessary) to gain knowledge of extraction and drainfield recharge in close proximity to City wells. Contingent upon outside funding through MDH SWP Grant or other funding sources, explore the possibility of installing a 4-inch monitoring well to be used for sample collection and / or future modeling of the Walker West aquifer. MDH will collaborate with DNR to explore opportunity to conduct a Surface Geophysical Mapping of the Walker West aquifer to refine info on aquifer thickness and extent. Outside funding necessary. High High High WHP Team City Staff MDH WHP Team City Staff MDH WHP Team City Staff MDH DNR Staff Time Staff Time Staff Time If opportunity develops If opportunity develops If opportunity develops 36

37 M. WELLHEAD PROTECTION RECOGNITION PLANNING, COORDINATION and REPORTING - Effectively track and report the implementation efforts and wellhead protection plan progress Implementation Action Items Implementation Time Frame Action # Description Priority Responsible Party & Cooperators Cost Update Plan 1 Hold an annual WHP Meeting to discuss past year s accomplishments and coordinate upcoming years activities. Very High WHP Manager Water Planner, MDH Staff Time X X X X X X X X X X 2 Maintain and keep up to date a WHP file that documents all WHP related activities that have been completed. Very High WHP Manager City Clerk Staff Time X X X X X X X X X X Complete a WHP Evaluation Report every 2.5 years that evaluates the progress of implementing the WHP Measures identified in this plan and the impact of (any) contaminant release on the aquifer supplying the public water supply wells. Submit report to MDH. Prepare a written evaluation during the next Plan Amendment, usually in year eight, and submit to MDH at the beginning of the amendment process. Assess, evaluate and address the current and future security needs related to water supply, treatment, storage and distribution. If any concern or issue arises, the city should contact MDH and discuss grant funding options/availability. High High Very High WHP Manager City Clerk WHP Mgr. City Staff, MDH, WHP Mgr. City Staff, MDH, Staff Time taff ime S T Staff Time X X X X Ongoing as needed 37

38 CHAPTER SIX EVALUATION PROGRAM ( ) Plan evaluation provides a means to determine whether WHP action items are achieving the intended result or whether they need to be modified to address changing administrative, technical, or financial resource conditions within the DWSMA. Evaluation is used to support plan implementation and is required under MR prior to amending the city s WHP plan. The Public Water Supplier has identified the following procedures that it will use to evaluate the success with implementing its WHP plan 1. Prepare an annual report or briefing for the City Council on the progress of wellhead protection implementation actions and actions the City would like to implement in the upcoming year. 2. The WHP Manager will annually consider and address implementation efforts and coordinate activities. New WHP issues, opportunities or changes needed in existing strategies identified in this plan will be discussed. 3. The City of Walker will prepare a written self-assessment report every 2.5 years that documents what plan implementation activities have been completed. The reports will be submitted to MDH when completed. The reports will also be kept in the city WHP file and made available at the first scoping meeting at the time the city will begin amending this wellhead protection plan. 38

39 CHAPTER SEVEN WATER SUPPLY CONTINGENCY PLAN ( ) WATER SUPPLY CONTINGENCY PLAN WALKER, MINNESOTA A. PURPOSE INDEX B. PUBLIC WATER SUPPLY CHARACTERISTICS 1. Current Supply Source 2. Treatment 3. Storage and Distribution 4. Maps and Plans C. PRIORITY OF WATER USERS DURING WATER SUPPLY EMERGENCY D. ALTERNATIVE WATER SUPPLY 1. Surface Water Sources and Treatment 2. Bottled Water 3. System Interconnects 4. Other Alternative Water Resources E. INVENTORY OF AVAILABLE EMERGENCY EQUIPMENT AND MATERIALS F. EMERGENCY IDENTIFICATION PROCEDURES G. NOTIFICATION PROCEDURES 1. Agency Contact List 2. Critical Response Personnel 3. Public Information Plan H. MITIGATION AND CONSERVATION PLAN 1. Mitigation 2. Conservation Annual Plan Review Date Reviewed Reviewer Comments Plan Distribution Person Organization Plan Location Terri Bjorklund City Administrator/Clerk City Hall Kerry Swenson Cass Co. Emergency Mgmt. Cass County Sheriffs Department Prepared by: Date Approved: 39

40 A. PURPOSE The purpose of this Contingency Plan is to establish, provide and keep updated, certain emergency response procedures and information for the City of Walker, MN that may become vital in the event of a partial or total loss of public water supply services due to disruptions of the water supply caused by contamination or mechanical failures of the public water supply system. B. PUBLIC WATER SUPPLY CHARACTERISTICS 1. Current Supply Source: Current production has been stable. Lot sales and industrial / commercial property owners will increase production rates in the future for City wells 4 & 5 of the Industrial Park Addition. City of Walker Well 1 Well 2 Well 3 Well 4 Well 5 Unique Well # Supply Source* QBAA QBAA QBAA QBUA QBUA Well Depth Well Diameter Well 650 gpm 650 gpm 900 gpm 50 gpm 50 gpm Production * QBAA- Quaternary Buried Artesian Aquifer, QBUA- Quaternary Buried Unconfined Aquifer 2. Treatment West: The two wells can be isolated and are presently alternating at a 5-day cycle on a closed system as demand requires. Treatment consists of inline addition of chlorine and fluoride. East: The wells can be isolated for repairs. Treatment consists of inline addition of chlorine and fluoride and filtration with addition of potassium permanganate. 3. Storage and Distribution West: No storage capacity is available with this closed system. Water is supplied by the two wells on a consumer demand basis. The water system contains all other necessary valving and piping with all of the connections metered. East: The system has two water towers with a 500,000 gallon capacity. During winter months October thru March only one 250,000 gallon capacity tower is used. The water system contains all other necessary valving and piping with all of the connections metered. 4. Maps/Plans Maps of the water distribution system and valving are on file at Walker City Hall. C. PRIORITY OF WATER USERS DURING WATER SUPPLY EMERGENCY Walker West Priority Group and Rank Maximum Daily Use (gpd) Minimum Daily Use (gpd) Residential--#1 Institutional--#2 Business--# Commercial--#4 40

41 Stille-Havn-Hus will have first priority in the advent of low pressure or an inability to supply all consumers. Infrastructure enables this facility to be isolated and supplied individually. All other consumers are industrial and / or commercial and are assigned the next priority level equally. Walker East Priority Group and Rank Maximum Daily Use (gpd) Minimum Daily Use (gpd) Residential--#1 20,000 10,000 Institutional--#2 25,000 10,000 Business--#3 25,000 10,000 Commercial--#4 20,000 10,000 Triggers for implementing water supply reduction/allocation Procedures: If the MDH Safe Drinking Water Rules are not met. If the City cannot provide sufficient quantities of water to consumers. In the event of a major system disruption, failure or an emergency, conservation procedures would be enacted by the Public Utilities Director, City Administrator, or the Mayor and City Council. D. ALTERNATIVE WATER SUPPLY OPTIONS 1. Water sources and treatment needs. The City of Walker s main well system (Well numbers 1,2 and 3) is available to supply water for transport to consumers of the Industrial Park. If a major catastrophic event disrupts both water sources, the Minnesota National Guard is available to provide emergency treatment of surface water for human consumption and the following procedure is recommended. i. Contact the County Sheriff (218) or 911 to request assistance from the Minnesota National Guard. ii. Sheriff contacts the Minnesota National Guard; Division of Emergency Management, State Duty Officer (800) ; and Community Support Group at (651) to request assistance for the City. iii. The Minnesota National Guard can provide a portable ROWPU (Reverse Osmosis Water Purification Unit) capable of supplying 900 gph or 15gpm. 2. Bottled water supplies, delivery and distribution: The City s two PWS systems are not interconnected. Local fire trucks will be identified and sanitized for use as water transport in the advent of an emergency. The following suppliers can deliver bottled water upon request: Culligan of Bemidji in Bemidji, MN contact at , ECOWATER Systems in Park Rapids, MN contact at , Kandiyohi Water Company in Bemidji, MN and NEI Bottling Company in Bemidji, MN All suppliers are approximately 45 minutes away from the City of Walker. 3. System interconnects with other water supplies. No interconnects are presently available within either of the PWS systems infrastructure. 41

42 4. New well. No other new wells are planned at this time. 5. Emergency or backup wells. The integration and interconnections within the City of Walker public water supply systems allows for the isolation of wells and components of each system while still being able to provide consumers with water. 6. Emergency treatment of water system. Presently there is a generator to power Wells 4 and 5, with an automatic switch-gear to operate when utility power is lost. Presently there is another generator located at the main water plant to supply power to water plant, Wells 1,2,& 3 and the main lift station in the park, when utility power is lost. This generator has to be manually started and a manual transfer of power is required. 7. Source Management (blending). The City does not blend the Walker West water system. The Walker East system is capable, but does not blend at this time. They alternate pumps each week. 8. Other. No other water supply alternatives have been identified by the City. E. INVENTORY OF AVAILABLE EMERGENCY EQUIPMENT AND MATERIALS Table E-1 contains a list of services, equipment and supplies that are available to the City of Walker for response to a disruption in the water system. It is believed that the items contained in Table E-1 would be adequate to respond to most (if not all) water system emergencies. Table E-1 Available Emergency Equipment and Materials Description Owner Telephone Location Acquisition Time Well Repair Thein Well Co Spicer, MN 4 hours Pump Repair WW Goetsch Baxter, MN 2 hours Electrician Mark Olson Walker, MN ½ hour Plumber Lindy s Benedict, MN ½ hour Backhoe/ Young s Hackensack, MN ½ hour Excavator Chemical Feed Excavating Hawkins Water Treatment Group Fargo, ND 3 hours Meter Repair Ferguson Water Blaine, MN 4 hours Generator City of Walker Walker, MN ½ hour Valves City of Walker Walker, MN ½ hour Pipe & fittings Fargo Water Fargo, ND 2 ½ hours 42

43 F. EMERGENCY IDENTIFICATION PROCEDURES Table F-1 Emergency Procedural Operations Incident Response Procedure & Comments Identify Disruption Person identifying disruption contacts City Hall. City Hall contacts Response Personnel Coordinator, City Clerk/Administrator, and / or Alternate Response Coordinator. Notify Response Personnel (Coordinator) Notify Response Personnel Coordinator or Alternate Personnel Coordinator Identify Incident Direction and Control Response Personnel Coordinator or Alternate assesses situation and determines incident direction and control, begin solving problem Identify Internal Communication Response Personnel Coordinator or Alternate contacts City Hall and City Clerk/Administrator to inform of situation Inform Public Assess Incident on Continual Basis Response Coordinator or City Clerk/Administrator contacts appropriate organizations to inform public of problem Response Personnel Coordinator or Alternate continue to monitor/solve problem Assess Contamination Disruption Response Personnel Coordinator or Alternate determines if water supply is contaminated. Monitor/solve problem as needed Assess Mechanical Disruption Response Personnel Coordinator or Alternate assesses mechanical disruption. Monitor and solve disruption as needed. Provide Alternate Water Supply If needed, alternate water supply is located and provided Impose Water Use Restrictions If needed, Public Utilities Director, Mayor or City Council may impose water use restrictions. 43

44 G. NOTIFICATION PROCEDURES 1. Agency Notification Table G-1 contains the names and telephone numbers for contacts at various local and state agencies that may be notified in the event of a public water supply system emergency. Based on the nature of the emergency and the information available, various representatives from this listing will be selected by the response coordinator to be part of the emergency oversight committee, which will then meet throughout the duration of the emergency to aid in decision-making and positive outcomes. Table G-1 Agency Emergency Contact Listing Personnel Name Home Telephone Work Telephone Mayor/Board Chair Jed Shaw Council Members Jim Senenselder Council Members Gary Wilkening Council Members Kelly Nelson Council Members Annie McMurrin Response Coordinator Neil Lange Alt. Response Terri Bjorklund Coordinator State Incident Duty MPCA Officer County Emergency Kerry Swanson Director Fire Chief Scott Bruns Sheriff Tom Burch Chief of Police Wayne Tennis System Operator Neil Lange Alt. System Operator Nick Zubke School Superintendent Dave Endicott Ambulance North Ambulance Medical Facility or St. Joseph s Hospital Doctor Park Rapids, MN Power Company M P & L Co. Highway Cass County MnDOT Department Telephone Company ACS Neighboring Water City of Walker Primary System Wells MPCA Herschel Blasing MRWA Technical Kyle Kedrowski Services MDH District Engineer Dave Schultz MDH SWP Unit Chris Parthun

45 2. Critical Response Personnel Table G-2 Critical Response Personnel Title Name Response Assignment Response Neil Lange Coordinate actions to address emergency Coordinator Alt. Response Terri Bjorkland Coordinate actions to address emergency Coordinator Water Operator Neil Lange Direct or contact firms to resolve issue Alt. Water Operator Nick Zubke Direct or contact firms to resolve issue Public Relations Scott Bruns Contact media to inform citizens / businesses of emergency Alt. Public Terri Bjorkland Contact media to inform citizens / Relations businesses of emergency Public City Fire Dept., City Assist City as needed to address emergency Health/Medical Ambulance Service, City & Cass County Police Dept, Park Rapids Hospital Alt. Public City Fire Dept., City Assist City as needed to address emergency Health/Medical Ambulance Service, City & Cass County Police Dept, Park Rapids Hospital 3. Public Information Plan: A. Public relations center and primary spokesperson: Name: Jed Shaw- Mayor / Public Relations Site: City Hall Address: 205 Minnesota Avenue-Walker, MN Home Phone: Work Phone: Public Information Center Location during Emergency: City Hall Times Available: City Hall would remain open as needed in the event of an emergency. Alternate Information Center Location Site: The Fire Hall (701 Elm Avenue) would be used as an alternate meeting site. B. Information checklist to be conveyed to the public and media: 1. Name of Water System 2. Contaminant of concern & date 3. Source of contamination 45

46 4. Public Health Hazard 5. Steps the public can take 6. Steps the water system is taking 7. Other Information C. Media Contacts: Walker West is a newly developed area for City Wells 4 and 5, with only a few lots occupied at this time. City staff will go door to door in emergency situations conveying the problem, procedures to be conducted for remedying and contact information. Walker East Critical Response media contacts are listed in the table below. Table G-3- Media Contacts Media Name Telephone Location Newspaper Pilot Independent (local) Walker, MN Bemidji Pioneer Bemidji, MN Television Paul Bunyan Communications Bemidji, MN Radio Paul Bunyan Broadcasting Bemidji, MN Mitigation and Conservation Plan 1. MITIGATION a. Infrastructure maintenance/upgrades/maps: Current maps and map booklets are available at City Hall. b. Regular inspection of towers, wells, pump house, & water plant: The water plant, and towers have keyed entries, are locked and have a security system in place. The well house for Walker East is locked and inspected daily. The water tower is cleaned and inspected on a competitive bid basis, every 10 years. c. Staff emergency training: Staff receives training annually through MRWA, AWWA and MDH schools and seminars. d. System security analysis: All facilities are locked, have keyed entries, and have a security system in place. e. Site new backup well: 46

47 No new well is planned at this time. f. System valving to isolate problems: The water system is adequately valved to isolate problems. g. Sanitation procedures for construction/repairs: 2. CONSERVATION All disinfection procedures are performed per State / AWWA specifications. a. Water Meters: Connections are metered and most are read by radio transmittance. There are 710 meters that are manually read at this time. b. Public Education: The City of Walker has their Consumer Confidence Report available on their website at and also has it available at City Hall for consumers. The City will continue to provide public education on a regular basis. c. Rate structure: The water rates are $20.00 base, $3.00/1000 gallons. Bulk water fees are $30.00 base, $4.00/100 gallons. REFERENCES Lund, Tracy J., 2013 Wellhead Protection Plan Amendment, Part 1 Walsh, James F. 2002, Wellhead Protection Plan for the City of Walker, Part 1 Walsh, James F. 2007, Wellhead Protection Plan Amendment, Part 1 Wright, H. E. Jr. 1972a, Physiography of Minnesota, In Geology of Minnesota, a centennial volume. Ed. Sim, P.K. and G.B. Morey. Minnesota Geological Survey/Minneapolis. P

48 APPENDIX A REFERENCED DATA FOR PART 2 LISTING OF EXHIBITS EXHIBIT 1- Soils and Description EXHIBIT 2- Zoning and Political Boundary EXHIBIT 3- Comprehensive Landuse: Walker West EXHIBIT 4- Comprehensive Landuse: Walker East EXHIBIT 5- Inner Well Management Zone Forms EXHIBIT 6- Old Municipal Wells Table EXHIBIT 7- PCSI Maps and Tables EXHIBIT 7.1- Changes to Original PCSI files and MW s EXHIBIT 8- Wellhead Protection Team EXHIBIT 9- Local Units of Government EXHIBIT 10- Annual Implementation Checklist Table EXHIBIT 11-Acronym Table 48

49 EXHIBIT 1: Soils Map (modified from USDA website) 49

50 50

51 EXHIBIT 2: Zoning and Political Boundary 51

52 EXHIBIT 3: Comprehensive Landuse Map and Table, Walker West 52

53 53

54 EXHIBIT 4: Comprehensive Landuse Map and Table, Walker East 54

55 55

56 EXHIBIT 5: Inner Well Management Zone Forms 56

57 57

58 58

59 59

60 60

61 61

62 62

63 63

64 64

65 65

66 66

67 67

68 68

69 69

70 70

71 71

72 72

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77 77

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79 79

80 80

81 EXHIBIT 6: Old Municipal Wells Table 81

82 EXHIBIT 7: PCSI Map and Table: Walker East 82

83 MPCA_ID/MDH NAME ADDRESS ACTIVITY STATUS MNS Cass County Sheriff Depart 301 Minnesota Ave W HWGP Active Cass County Sheriff Depart 303 Minnesota Ave W HWGP Active Essentia (Co Pub Health Bldg) 110 Michigan Ave HWGP Active MNS Thrifty White Drug Michigan Ave W HWGP Active US DEA 300 Minnesota Ave HWGP Active MND Pilot Independent Newspaper 408 Main St HWGP Active WCERT Steven E Bilben/dental Office 108 Michi Ave W HWGP Active MND Walker ISD # th St HWGP Active (Mdh) Walker PWS No. 1 & 2 2nd St Leak Site Inactive 4119 Abandoned Railroad Tracks Railroad Ave Leak Site Inactive Bj Service (Bail Bond) 401 4th St Leak Site Inactive Gas N Splash 401 Minnesota Ave W Leak Site Inactive Moose Properties Strip Mall 403 Minnesota Ave Leak Site Fuel-oil 1&2 Active 6049 Pat Tabaka Property 3rd St & Railroad Leak Site Inactive 140 PWS contamination Unk type Unknown Leak Site Unk Product Inactive 4027 The Village Square 5th & Minnesota Leak Site Inactive 5485 Us Army Reserve Center Highland & Division Leak Site Inactive Cass Co Public Health Bldg 110 Michigan Ave Leak Site Inactive MND Walker Dump CERCLIS SR 1210 Suspected contamination Inactive 900 Walker Housing Authority 211 Mich Ave W UST 10K Fuel oil Active 937 Saint Agnes Church PO Box 584 Mich Ave UST 1K Fuel-oil Active 945 Cass County Courthouse 300 Minnesota Ave UST2-10K Fuel oil 1K Diesel Active 933 Ortons Hwy 371 UST 2-12K Gas Active AST-2K Kerosene UST 8K Gas UST 2-8K Diesel 968 Walker ISD # th St UST 10K 2nd containment Active Municipal Well #1 Public Water Supply Well Active Municipal Well #2 Public Water Supply Well Active Municipal Well #3 Public Water Supply Well Active MW 300 Minnesota Ave Well Active MW 403 Minnesota Ave Well Active MW 403 Minnesota Ave Well Active MW 403 Minnesota Ave Well Active Private Mary Wheeler-Andrus 1200 Lake May Rd Well and Septic Active VP21330 Walker Stormwater Pond 201 Minnesota Ave Voluntary Invest & Cleanup Inactive SWB Stormwater Basin Active Private fuel oil Terry Storm 202 Cleveland Blvd UST Active Private fuel oil Deborah Farrel 400 5th St S UST Active Private fuel oil Victor Alexander th St S UST Active Gasoline Stewart's 309 5th Street N AST Active Private fuel oil Gerald Bixby 301 Cleveland AST Active Private fuel oil Patrick Bauer 200 Ross Place N AST Active Private fuel oil Zonas 101 5th Street N AST Active Private fuel oil Hair on Main 407 Minnesota Ave W AST Active Private fuel oil Artists Mall 414 Minnesota Ave W AST Active Private fuel oil Steve Blake 205 Michigan Ave W AST Active Private fuel oil Trent Stewart 113 Michigan Ave W AST Active Private fuel oil Mike Stebe (James Bleth) 109 Michigan Ave W AST Active Private fuel oil David Fisher 500 4th Street S AST Active Private fuel oil Thomas Sheets 300 4th Street S AST Active Private fuel oil Patrick Pitzen 215 4th Street S AST Active Private fuel oil Troy Stewart 209 4th Street S AST Active Private fuel oil Bruce Haugen 401 Michigan Ave W AST Active Private fuel oil Scott & Jeanne Privratsky 209 5th Street S AST Active Private fuel oil Scott Severson 217 5th Street S AST Active Private fuel oil Ryan Lair 308 5th Street S AST Active Stormwater Stormwater Feature Stormwater Outlet SROUT Active 83

84 EXHIBIT 7: PCSI Map and Table: Walker West Municipal Well #4 Public Water Supply Well Active Municipal Well #5 Public Water Supply Well Active Class V Sewage Treatment System Industrial Park Service Active 84