ENVIRONMENTAL ASSESSMENT WORKSHEET

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2 ENVIRONMENTAL ASSESSMENT WORKSHEET Note to reviewers: The Environmental Assessment Worksheet (EAW) provides information about a project that may have the potential for significant environmental effects. This EAW was prepared by the Minnesota Pollution Control Agency (MPCA), acting as the Responsible Governmental Unit (RGU), to determine whether an Environmental Impact Statement (EIS) should be prepared. The project proposer supplied reasonably accessible data for, but did not complete the final worksheet. Comments on the EAW must be submitted to the MPCA during the 30-day comment period which begins with notice of the availability of the EAW in the Minnesota Environmental Quality Board (EQB) Monitor. Comments on the EAW should address the accuracy and completeness of information, potential impacts that are reasonably expected to occur that warrant further investigation, and the need for an EIS. A copy of the EAW may be obtained from the MPCA by calling An electronic version of the completed EAW is available at the MPCA Web site 1. Project Title: Flagstaff Avenue Trunk Sewer Line Project 2. Proposer: City of Farmington 3. RGU: Minnesota Pollution Control Agency Contact Person Lee Mann Contact Person Jessica Ebertz and Title Director of Public Works and Title Project Manager Address 325 Oak Street Address 520 Lafayette Road North Farmington, Minnesota St. Paul, Minnesota Phone Phone Fax Fax lmann@ci.farmington.mn.us jessica.ebertz@pca.state.mn.us 4. Reason for EAW Preparation: EIS Scoping Mandatory EAW X Citizen Petition RGU Discretion Proposer Volunteered If EAW or EIS is mandatory give EQB rule category subpart number and name: Minn. R , subp. 18 Wastewater Systems 5. Project Location: County Dakota City Farmington 1/4 1/4 Section 22, 23, 26, 27, 34, 35 Township 114 North Range 20 West p-ear1-04 TDD (for hearing and speech impaired only): (651) Printed on recycled paper containing 30% fibers from paper recycled by consumers

3 Attachments and Figures for the EAW: Attachments: Attachment 1 Attachment 2 Attachment 3 Attachment 4 Trout Stream Map and Required Best Management Practices (BMPs) for Discharges Minnesota Department of Natural Resources (DNR) Natural Heritage and Nongame Research Program Response Letter, dated August 25, 2006 Overview of Minnesota s National Pollutant Discharge Elimination System (NPDES)/State Disposal System (SDS) Construction Stormwater Permit (MPCA publication, November 2005) Minnesota Historical Society State Historic Preservation Office (SHPO) Response to Inquiry, dated August 7, 2006 Figures: Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 General Site Location U.S. Geological Survey Topographic Map Farmington, Minnesota, Quadrangle Proposed Trunk Sewer Alignment Existing Metropolitan Council Environmental Services (MCES) Regional Sewer System Project Service Area Wetland Delineation National Wetlands Inventory (NWI) DNR Public Waters Inventory/Federal Emergency Management Agency Floodplain Dakota County Soils 6. Description: a. Provide a project summary of 50 words or less to be published in the EQB Monitor. The city of Farmington (City) proposes to construct approximately 12,630 feet of trunk sewer line, primarily within Flagstaff Avenue, to serve the new Farmington Area High School and other future development in the area, including a portion of the city of Lakeville. The trunk line is anticipated to carry average daily flows of million gallons per day (MGD) initially, with an ultimate capacity of 2.6 MGD. b. Give a complete description of the proposed project and related new construction. Attach additional sheets as necessary. Emphasize construction, operation methods and features that will cause physical manipulation of the environment or will produce wastes. Include modifications to existing equipment or industrial processes and significant demolition, removal or remodeling of existing structures. Indicate the timing and duration of construction activities. The City is proposing to construct approximately 12,630 feet of trunk sewer line, primarily along Flagstaff Avenue, in order to serve the new Farmington Area High School and other future development in the area, including a portion of the city of Lakeville. The line will consist of segments of 27 and 30- inch pipe, and is anticipated to carry MGD initially, and 2.6 MGD ultimately Flagstaff Avenue Trunk Sewer Line Farmington, Minnesota 2 Environmental Assessment Worksheet

4 (average daily flows). Figures 1, 2, and 3 depict the location and alignment of the project; Figure 4 depicts the existing MCES Regional Sewer System; and Figure 5 depicts the service area for the project. The alignment of the proposed trunk line will begin at an existing MCES interceptor south of County State Aid Highway (CSAH) 50 and will extend approximately 9,330 feet northward along Flagstaff Avenue to 200 th Street. Then it will turn to the west on 200 th Street, proceed for approximately 1,500 feet and then zigzag up to the Farmington/Lakeville border. The total length of the trunk line will be approximately 12,630 feet, or 2.39 miles. The Flagstaff Avenue portion of the trunk line will be constructed entirely within existing and future road right-of-way and will be coordinated with the reconstruction of Flagstaff Avenue. Permits will be obtained in conjunction with the road project. Initially, the proposed line will serve only the new Farmington Area High School. Flows are expected to be MGD when the school opens in At full capacity of the school (anticipated by year 2017), flows are expected to be MGD. The City s current Comprehensive Plan does not provide for other development in the area until after Most of the land in the project area is designated urban reserve land that is to remain undeveloped until after In Lakeville, the project service area is also designated urban reserve, per the Lakeville Staged Metropolitan Urban Service Area Expansion Areas map. The Comprehensive Plans for the cities of Farmington and Lakeville are required by the Metropolitan Council to be updated in The guided land use element of the plan is subject to public input, which may guide land use change in the trunk sewer service areas. The land use designations of the service areas will be re-evaluated during the 2008 update of the Cities Comprehensive Plans. For now, existing properties in the area will be required to maintain their on-site individual waste treatment systems. At full build-out of the service area, average flows in the trunk line are anticipated to be 2.6 MGD. Because of the high ground water table in the area, the City regularly monitors its sanitary sewer system for inflow and infiltration (I & I) into the system. As part of the City s efforts to monitor the I & I, a metering structure is proposed upstream of the connection to the MCES interceptor to measure the flow volumes generated by the new high school and the future service area. The City s Comprehensive Sanitary Sewer Plan (CSSP) shows an eight-inch pipe extending north near the Farmington/Lakeville border. The proposed trunk sewer will replace the eight-inch line. The proposed line will enable the City to adjust sewer service district boundaries for future development areas and will allow flexibility in development densities. The trunk sewer will eventually serve approximately 749 acres of Farmington (see Figure 5). In the future, it may also serve approximately 1,345 acres of Lakeville (see Figure 5), described as the Farmington Outlet in Lakeville s CSSP. Construction of the trunk line will involve grading, excavation, backfilling, potential de-watering, and re-vegetation activities. Equipment to be used will include standard construction machinery, such as trucks, backhoes, graders, compactors, bobcats, cranes, loaders, compressors, and possibly de-watering pumps. Construction of the project is anticipated to begin summer 2007 and be completed by fall c. Explain the project purpose; if the project will be carried out by a governmental unit, explain the need for the project and identify its beneficiaries. The proposed Flagstaff Avenue Trunk Sewer Line will be needed to convey future wastewater flow from a new high school and future development within a 749-acre area of the City and a 1,345-acre area of Lakeville (see Figure 5). Eventual beneficiaries of the project will include the school, residents, and business operators in this area. Flagstaff Avenue Trunk Sewer Line Farmington, Minnesota 3 Environmental Assessment Worksheet

5 d. Are future stages of this development including development on any outlots planned or likely to happen? Yes No If yes, briefly describe future stages, relationship to present project, time line, and plans for environmental review. Local sewers within future planned developments will be constructed as needed to connect with the Flagstaff Avenue trunk line after construction of the trunk sewer is complete. The locations of these future local sewer lines have not been determined yet. The locations will depend on street layouts, and where and when development occurs within the service area. Sewer extension permits must be obtained from the MPCA for the connecting sewer lines. In accordance with Minn. R , subp. 18 (2006), any future expansion of the proposed system resulting in an increase in design average daily flow of 2 MGD or more would require completion of a separate EAW at that time e. Is this project a subsequent stage of an earlier project? Yes No If yes, briefly describe the past development, timeline and any past environmental review. The Flagstaff Trunk Sewer Line is not a subsequent stage of an earlier project. However, the timing of the proposed sewer has been adjusted due to a proposed school project. The new Farmington High School project was reviewed in an EAW noticed in the July 3, 2006, issue of the EQB Monitor. The 30-day public comment period ended August 2, A Negative Declaration on the need for an EIS was issued August 21, 2006, at a City Council meeting. 7. Project Magnitude Data Total Project Area (acres) acres or Length (miles) 2.39 miles Number of Residential Units: Unattached 0 Attached 0 Maximum units per building NA Commercial/Industrial/Institutional Building Area (gross floor space): total square feet 0 Indicate area of specific uses (in square feet): Office 0 Manufacturing 0 Retail 0 Other Industrial 0 Warehouse 0 Institutional 0 Light Industrial 0 Agricultural 0 Other Commercial (specify) 0 Building height NA If over 2 stories, compare to heights of nearby buildings NA The approximate length and total project area of the proposed project is indicated above, and has been estimated using approximate construction limits (temporary construction easement/temporary area of disturbance). Flagstaff Avenue Trunk Sewer Line Farmington, Minnesota 4 Environmental Assessment Worksheet

6 8. Permits and approvals required. List all known local, state and federal permits, approvals and financial assistance for the project. Include modifications of any existing permits, governmental review of plans, and all direct and indirect forms of public financial assistance including bond guarantees, Tax Increment Financing and infrastructure. Unit of Government Type of Application Status U.S. Army Corps of Engineers Wetland/Water Project Public Linear Application to be submitted Utility Project (GP/LOP-98-MN- Section 404 Activities in Minnesota) MPCA Review and approval of Construction Application to be submitted Plans and Specifications MPCA NPDES/SDS General Permit for Application to be submitted Discharge of Stormwater during Construction Activities (Stormwater Permit) MPCA Sewer Extension Permit Application to be submitted DNR General Permit for Temporary Water Appropriations, if needed Application to be submitted by construction contractor if more than 10,000 gallons per day or 1 million gallons per year of water is Minnesota Department of Health (MDH) Metropolitan Council Metropolitan Council Dakota County Transportation Department Vermillion River Watershed Joint Powers Organization (VRWJPO)* City of Farmington Water Well Permits Farmington Comprehensive Plan Amendment Permit to Connect to MCES Sewer System Permit for Utility Construction on County Highway Right-of-Way Review and approval of land alteration plans, erosion and sediment control plans, grading plans, stormwater management plans, etc. Permit for wetland impacts and mitigation per the Minnesota Wetland Conservation Act (to be coordinated with the proposed Flagstaff Avenue appropriated Application to be submitted (if dewatering wells are necessary) Approved Application to be submitted Application to be submitted Application to be submitted pending adoption of standards and rules Application to be submitted (to be coordinated with the proposed Flagstaff Avenue reconstruction project) reconstruction project) *The VRWJPO was formed in November 2005 and published Draft Rules in May The rules address standards, policies, and permits regarding floodplains, wetlands, buffers, stormwater management, drainage, and agricultural production. The Draft Rules were distributed for a public review and comment period that ended January 31, As of late February, the VRWJPO was in the process of considering the comments and had not yet formally adopted the rules. Flagstaff Avenue Trunk Sewer Line Farmington, Minnesota 5 Environmental Assessment Worksheet

7 9. Land use. Describe current and recent past land use and development on the site and on adjacent lands. Discuss project compatibility with adjacent and nearby land uses. Indicate whether any potential conflicts involve environmental matters. Identify any potential environmental hazards due to past site uses, such as soil contamination or abandoned storage tanks, or proximity to nearby hazardous liquid or gas pipelines. Land use adjacent to the proposed Flagstaff Avenue Trunk Sewer Line consists of rural residences and farmsteads, cropland, and feedlots. The new Farmington High School is proposed west of Flagstaff Avenue, between CSAH 50 and 200 th Street. Construction of the school began in 2006 with grading and the installation of utilities, and is anticipated to be complete in Wetland and small wooded areas are also present along or near the alignment. A tributary to the Vermillion River is near the southern end of the proposed alignment where it connects to the existing MCES sewer. The alignment will not directly impact the tributary. Other small creeks or ditches are also present in the area, some of which extend across the corridor. The project is located in a rural area, where most of the land (other than the new high school site) is currently in urban reserve. The project will serve only the high school initially, but in the future will also serve other areas as development occurs in portions of the cities of Farmington and Lakeville (see Figure 5). The proposed project is compatible with existing and proposed land uses in the area. An internet search of MPCA records for contaminated properties in the project area was conducted using the What s in My Neighborhood search program. Eight sites with contamination were identified in the City. The nearest one is approximately one mile east of the project corridor. Due to the distance of the project corridor from the sites of known contamination, it is unlikely that it would be impacted by the contamination. Although contamination is not known to be present in the project area, it is likely that chemical substances and petroleum products have been and continue to be used and stored at the agricultural properties along the corridor. If contamination is encountered during construction, the health and safety plan and/or contingency plan prepared by the contractor will address appropriate procedures the contractor should follow (i.e., discontinue work, notify the State Duty Officer, and work with the MPCA to address the situation). In addition, the Stormwater Pollution Prevention Plan (SWPPP) prepared for the project as part of the Stormwater Permit will address the proper response if contamination is encountered and/or caused by project activities. 10. Cover Types. Estimate the acreage of the site with each of the following cover types before and after development (in acres): Before After Before After Types 1-8 wetlands Lawn/landscaping Wooded/forest Impervious Surfaces Brush/grassland Other (feedlots) Cropland TOTAL *Estimates are based on the temporary construction easement (area of temporary disturbance), which varies in width along the corridor. Approximately 0.05 acres of permanent wetland impact will be caused by the road work being coordinated with the sewer project. Flagstaff Avenue Trunk Sewer Line Farmington, Minnesota 6 Environmental Assessment Worksheet

8 11. Fish, Wildlife, and Ecologically Sensitive Resources. a. Identify fish and wildlife resources and habitats on or near the site and describe how they would be affected by the project. Describe any measures to be taken to minimize or avoid impacts. Wildlife species are likely to include primarily those species common to agricultural and developing areas. Toward the southern end of the project, wildlife species may be more diverse due to the proximity of the project to a creek, known locally as South Creek, that is a tributary to the Vermillion River. South Creek, the Vermillion River, and other tributaries to the Vermillion River in the project area are designated as trout streams (see Attachment 1). Under Minn. R , subp. 4, discharges to trout streams must incorporate specific BMPs that address erosion control, water quality and volume, and temperature control (Attachment 1). The project will be required to comply with regulations regarding trout stream discharges. Development within the project service area that is enabled by the project and is within 2,000 feet of a designated trout stream will also be required to comply with the regulations. In general, wildlife species in the project area might include: fox, deer, muskrat, squirrel, rabbit, mice and other small rodents, geese, ducks, raptors, a variety of other common bird species, and small reptiles. Amphibians and small fish may also be present in ditches, wetland areas, and the tributary to the Vermillion River. Short-term impacts on wildlife will include the disruptive effects of construction, including excavation, stockpiling of soils and materials, noise, limited erosion and sedimentation, and vehicle movement. Habitat and individual animals will be destroyed by the actual excavation or placement of stockpiled earth or bedding, and tree/forest cutting. Surviving small species may be forced to leave their territories and compete with established individuals in other areas. Larger species may be forced to relocate to portions of their territories that are not impacted. Seasonal activities, such as nesting, may be disrupted or curtailed, depending upon the season of construction. The project itself will not permanently displace wildlife; however, urban development eventually enabled by the trunk sewer line will cause a shift in the species present. Species tolerant of urban areas will remain, while others less tolerant may be permanently displaced. Adherence to the comprehensive plan and stormwater ordinances adopted by the City and the VRWJPO will help mitigate stormwater impacts resulting from development. Construction through wetland areas will be necessary in some areas (see Figure 6). Item 12 provides a discussion of wetland impacts, minimization, and mitigation. Construction through some small wooded areas will also be necessary. Approximately 0.73 acres of trees will be removed. Some of the trees are planned to be transplanted. Potential tree replacement will be negotiated with individual property owners during the easement acquisition process. Permits/approvals requiring mitigation measures include the MPCA Stormwater Permit and the VRWJPO approval of the Grading Plan and Sediment and Erosion Control Plan. These, and other permits listed in Item 8 of this EAW, will include specific mitigation measures to be provided for erosion and sediment control, stormwater runoff, and potential wetland impacts. Measures will include erosion control BMPs, such as use of erosion control blankets and prompt re-vegetation of disturbed areas. Flagstaff Avenue Trunk Sewer Line Farmington, Minnesota 7 Environmental Assessment Worksheet

9 b. Are any state (endangered or threatened) species, rare plant communities or other sensitive ecological resources such as native prairie habitat, colonial waterbird nesting colonies or regionally rare plant communities on or near the site? Yes No If yes, describe the resource and how it would be affected by the project. Indicate if a site survey of the resources has been conducted and describe the results. If the DNR Natural Heritage and Nongame Research program has been contacted give the correspondence reference number. ERDB Describe measures to minimize or avoid adverse impacts. The DNR Natural Heritage and Nongame Research Program was contacted regarding the potential presence of threatened or endangered species, as well as other rare or sensitive biological resources in the vicinity of the project. According to the response received (see Attachment 2), there are no known occurrences of rare plant or animal species or other significant natural features within one mile of the project site. 12. Physical Impacts on Water Resources. Will the project involve the physical or hydrologic alteration (dredging, filling, stream diversion, outfall structure, diking, and impoundment) of any surface waters such as a lake, pond, wetland, stream or drainage ditch? Yes No If yes, identify water resource affected. Describe alternatives considered and proposed mitigation measures to minimize impacts. Give the DNR Protected Waters Inventory (PWI) number(s) if the water resources affected are on the PWI. Jurisdictional wetlands in the project corridor along Flagstaff Avenue were delineated in August Wetlands along 200 th Street have not been delineated, as this segment of the alignment was recently added to the project. A delineation of the wetlands in the 200 th Street area will be completed in spring The delineated wetlands are shown on Figure 6; NWI wetlands are shown on Figure 7. Construction through wetland areas will be necessary. Wetland impacts along Flagstaff Avenue will be permanent because of the associated road work. Approximately 0.05 acres of permanent wetland impact is proposed, mainly due to the raising of the road in some areas and the required side slopes. Mitigation for impacts due to the road work is planned to be completed with the purchase of banked wetland credits through the Minnesota Board of Water and Soil Resources road replacement program. A temporary wetland impact will occur in the northern part of the project corridor where the alignment crosses a wetland area along 200 th Street and turns to the north. Restoration will be completed after construction through this area. Original grade contours will be restored and, therefore, pre-construction drainage patterns will not be altered by the project. Wetland vegetation will also be restored in this area by seeding with a native wetland seed mix. Permitting for both the temporary and permanent wetland impacts will be completed jointly with the Flagstaff Avenue reconstruction project. Construction of the sanitary sewer project will not impact DNR public waters (see Figure 8). The nearest public water is the tributary (South Creek) to the Vermillion River, which flows past the southern end of the proposed trunk sewer alignment. The trunk line will connect to the MCES interceptor in this area, but will not impact the creek because the interceptor is located on the north side of the tributary. Erosion control measures (silt fence, fiber blankets, prompt re-vegetation, etc.) will prevent/minimize impacts to the creek during construction. Flagstaff Avenue Trunk Sewer Line Farmington, Minnesota 8 Environmental Assessment Worksheet

10 Dewatering may be necessary in some areas as discussed in Item 13. Discharge would be directed to sediment traps or vegetative buffer strips if the discharge is laden with sediment. A filter sock may also be used to trap the sediment and filter the water prior to discharge. If dewatering wells are needed, clean discharge from well point dewatering would be discharged in accordance with agency permits. BMPs would be followed. The contractor would be responsible for obtaining permits from the DNR and the MDH for temporary water appropriations and temporary dewatering wells, respectively, if needed. A Stormwater Permit will be obtained for the project, as required by the MPCA. As part of the Stormwater Permit, an SWPPP with temporary and permanent erosion and sediment control plans will be prepared and submitted to the MPCA. Erosion and sediment control plans will also be submitted to the VRWJPO for review and approval. Approved plans will be implemented during and after construction as appropriate until site stabilization has been achieved. The sediment and erosion control plans will provide more detail as to the specific measures to be implemented and will also address phasing of construction, vehicle tracking of sediment, inspection of erosion control measures, and the time frames in which the erosion control measures will be implemented (see Item 16 for more information). Wetland impacts proposed as part of future development enabled by the trunk sewer project will be subject to federal, state and local rules and regulations. Minn. R. ch. 7050, as well as the federal Clean Water Act and the state Wetland Conservation Act, require that impacts to wetlands be avoided if prudent and feasible alternatives exist. If prudent and feasible alternatives are not available, then the impacts to wetlands must be minimized and/or mitigated. Because the service area of the proposed project is largely undeveloped at the present time, it is expected that prudent and feasible alternatives do exist and that proper planning by the City will result in the avoidance of wetland impacts. 13. Water Use. Will the project involve installation or abandonment of any water wells, connection to or changes in any public water supply or appropriation of any ground or surface water (including dewatering)? Yes No If yes, as applicable, give location and purpose of any new wells; public supply affected, changes to be made, and water quantities to be used; the source, duration, quantity and purpose of any appropriations; and unique well numbers and DNR appropriation permit numbers, if known. Identify any existing and new wells on the site map. If there are no wells known on site, explain methodology used to determine. City water service has not yet been extended to the project area; all of the rural residences and farmsteads are served by individual private water wells. City water will be extended to serve the new Farmington High School, but is not expected to be extended to serve existing properties or other development until such time that development is permitted. Currently, most of the project area is planned to remain in agricultural use. The proposed trunk sewer project has the potential to affect water use in two ways: 1) Construction of the trunk sewer line may require the relocation of existing wells to maintain isolation distances required by Minn. R. ch. 4725; and 2) Construction of the trunk sewer could require dewatering during construction. Water appropriation permits would be required for withdrawals of or greater than 10,000 gallons per day or 1,000,000 gallons per year. Flagstaff Avenue Trunk Sewer Line Farmington, Minnesota 9 Environmental Assessment Worksheet

11 Separation Distance from Water Supply Wells Information from the MDH indicates that a minimum separation or isolation distance must be maintained between a well and a source of contamination to protect the well and the ground water. The distance applies to the construction of new wells, and to the placement of contamination sources near existing wells. The well rules contain specific isolation distances from contamination sources such as petroleum tanks, chemical storage, and septic systems, including the most common contamination source encountered on building projects - sewers. A minimum separation of 50 feet must be maintained between a buried sewer and a well. This distance may be reduced to 20 feet if the sewer is constructed of cast iron or plastic pipe meeting the standards of the Well Code and the Minnesota Plumbing Code, and if the sewer has been successfully air-tested. The separation requirement applies to all buried pipes carrying sewage, both outside a building and under the building floor. The separation applies not only to wells used to provide drinking water, but also to wells used for other purposes, such as irrigation. At this time, it does not appear that abandonment of wells identified in the project area will be needed due to the 50-foot separation requirement. However, a field survey will be necessary to accurately determine the distances of wells on adjacent properties from the trunk sewer line. Appropriate measures will be taken to maintain required separation distances, or if it is determined that water wells are present within minimum setbacks from the sewer alignments, they will be properly abandoned in accordance with MDH regulations. Dewatering during Construction Soil borings have been completed along the proposed project alignment. Measurable water levels were encountered in approximately 40 percent of the boreholes and ranged from 4 to 23 feet below grade. Water levels generally appeared in low-lying areas, or in the areas where borings were extended deeper. Where the underlying soils consist mostly of sands, the recorded water level provides a reasonably good representation of the ground-water table at that time and location. However, when water levels are recorded within sand layers that are interbedded with otherwise slow-draining soils, water may be held up or perched within the profile and not a true hydrostatic condition. In these areas, the water encountered is believed to be perched above regional ground-water levels. It is likely that perched water tables occur at or near the surface in areas of wetlands. Trench dams could be incorporated into the project, if necessary, to prevent unintentional draining of wetlands through or near which the alignment passes. The position of trench dams would depend on observed ground-water conditions. Soil borings will be used to identify perched wetlands created by horizontal confining layers that could be penetrated by the trench and drained. If necessary, a confining layer of low-permeability soils will be restored to maintain perched conditions. Temporary dewatering may be needed in some areas in order to place the trunk sewer pipe at the required depths. Dewatering wells would be placed by the construction contractor based on the evaluation of dewatering needed. It is not yet known if the volumes of water would be such that a permit from the DNR would be required. The threshold for the DNR Water Appropriation Permit is 10,000 gallons per day, or 1 million gallons per year. The proposed project may need a temporary permit DNR General Permit for Temporary Water Appropriations. The threshold for this permit is also 10,000 gallons per day, but total gallons pumped cannot exceed 50 million gallons, and water appropriations must be completed within one year from the start of pumping. Where dewatering is necessary, discharge would be directed to sediment traps or vegetative buffer strips if the discharge is laden with sediment. A filter sock may also be used to trap the sediment and filter the Flagstaff Avenue Trunk Sewer Line Farmington, Minnesota 10 Environmental Assessment Worksheet

12 water prior to discharge. If dewatering wells are needed, clean discharge from well point dewatering would be discharged in accordance with agency permits. BMPs would be followed. The contractor would be responsible for obtaining permits from the DNR and the MDH for temporary water appropriations and temporary dewatering wells, respectively, if needed. To determine the likelihood that construction dewatering along Flagstaff Avenue would potentially impact nearby water supply wells, a search of the County Well Index (CWI) was conducted, with assistance from staff at Dakota County. Wells identified in the area are listed in the table below. Private Water Wells Well ID Address Aquifer Depth to Water in Well (feet) Drop Pipe Depth (feet) Flagstaff Avenue Prairie du Chien* th Street Prairie du Chien Flagstaff Avenue St. Peter* Flagstaff Avenue Prairie du Chien* Flagstaff Avenue Prairie du Chien* Flagstaff Avenue St. Peter* Flagstaff Avenue St. Peter* Flagstaff Avenue Drift* (David Olson property) Flagstaff Avenue Prairie du Chien* Flagstaff Avenue St. Peter* Flagstaff Avenue Drift Flagstaff Avenue Prairie du Chien* * Aquifer overlain by thick clay deposits (greater than 30 feet of continuous thickness). Using the assumption that dewatering will extend to a depth up to 50 feet from the land surface, the following two factors were analyzed for the study: 1) Aquifer connection. The hydraulic connection between the aquifer the well pulls its water from and the water table had to be established. The connection is expected to be seen in areas where highly permeable sediments overlie the aquifer from 50 feet below the land surface to the top of the aquifer. In instances where 30 or more feet of continuous clay were observed in geologic logs between 50 feet and the top of the aquifer, one can assume that the aquifer the well is using is not hydraulically connected to the water table, at least at the location of the well itself. A hydraulic connection may possibly exist in a nearby area where the clay layer is absent. 2) Depth of the pump. The depth of the pump below the land surface indicates whether dewatering to 50 feet is likely to draw the water table below the setting of the pump. A safety factor of 20 feet was considered for this analysis, to take into account potential drawdown of the aquifer from the pump itself. Therefore, any well with a pump setting less than 70 feet is thought to have a greater potential to be impacted. Flagstaff Avenue Trunk Sewer Line Farmington, Minnesota 11 Environmental Assessment Worksheet

13 Using these factors, only two wells showed a likely connection between the water table and the aquifer used by that well. Of these two wells, only one well showed a pump setting less than 70 feet. This well is located at Flagstaff Avenue. Note that three other wells have pump settings less than 70 feet. While it is assumed these wells are not in direct hydraulic connection with the water table aquifer, the potential exists that there is a window between the aquifer and the water table near the point of the proposed dewatering. As such, there exists a possibility that dewatering may impact these wells. In particular, the well on the David Olson property has a pump setting of only 36 feet, and has the greatest possibility of being impacted if the water table is in connection with the deeper drift aquifer. Impacts from the dewatering are expected to decrease at distances laterally away from the trenches. So while dewatering within the trench may reach 50 feet in depth, at a distance of 100 feet from the trench, the depth of the affected water table will likely be significantly less. Also, there exists the possibility that there are other wells in the project area that are not part of the CWI and Dakota County inventory. If other properties are located along Flagstaff Avenue near the dewatering area, but are not listed above, the assumption should be made that these properties contain wells. The City is not expecting that dewatering activities would impact nearby wells. If it is determined that a particular well would be impacted significantly, the City s options for mitigation include modifications to the existing well or the installation of a new well. 14. Water-related land use management districts. Does any part of the project involve a shoreland zoning district, a delineated 100-year flood plain, or a state or federally designated wild or scenic river land use district? Yes No If yes, identify the district and discuss project compatibility with district land use restrictions. The project is not located in or adjacent to a state or federally-designated wild or scenic river land use district. However, the southern part of the alignment extends within a shoreland zoning district and 100-year floodplain associated with the tributary to the Vermillion River. The project will comply with rules for construction of utilities in shoreland and floodplain districts. The project is also located within the jurisdiction of the VRWJPO. As indicated in Item 8, the VRWJPO was formed in November 2005, and published Draft Rules in May The rules address standards, policies, and permits regarding floodplains, wetlands, buffers, stormwater management, drainage, and agricultural production. The Draft Rules were distributed for public review in December 2006, and the comment period ended January 31, The VRWJPO is in the process of reviewing the comments received and has not yet formally adopted the rules. However, all land alteration plans, erosion and sediment control plans, grading plans, stormwater management plans, etc., for the project will be submitted to the VRWJPO for review and approval, and the project will comply with VRWJPO requirements. 15. Water Surface Use. Will the project change the number or type of watercraft on any water body? Yes No If yes, indicate the current and projected watercraft usage and discuss any potential overcrowding or conflicts with other uses. The project will not directly change the number of watercraft on any water body. However, it will eventually enable additional residential and other development in the City. It is possible that some of the residents might engage in boating activities on area lakes. Flagstaff Avenue Trunk Sewer Line Farmington, Minnesota 12 Environmental Assessment Worksheet

14 16. Erosion and Sedimentation. Give the acreage to be graded or excavated and the cubic yards of soil to be moved: acres; 300,000 cubic yards. Describe any steep slopes or highly erodible soils and identify them on the site map. Describe any erosion and sedimentation control measures to be used during and after project construction. Steep slopes are generally considered to be slopes greater than 12 percent. According to Dakota County soils information, two of the soils identified in the project area exhibit steep slopes, and both are indicated to be eroded: 963D2 Timula-Bold silt loams, percent slopes, eroded; 963E2 Timula-Bold silt loams, percent slopes, eroded (see Item 19 and Figure 9). The majority of excavated soil will be returned to the construction trench after placement of the pipe. Any excess soil will be disposed of in upland areas where sediment will not impact water resources or other sensitive areas. Soil erosion control practices will be implemented to minimize impacts to the Vermillion River tributary, wetlands, and other surface waters in the vicinity of the project. BMPs will be observed. Construction practices will be managed to limit the duration of exposed soil to wind and rain; disturbed areas will be seeded and stabilized as soon as possible after construction. Detailed temporary and permanent sediment and erosion control plans must be prepared in accordance with the MPCA Stormwater Permit. The erosion and sediment control plans and grading plans will also be submitted for review and approval to the VRWJPO. Measures will be implemented prior to the start of construction and will remain in place until site stabilization has been achieved. Regular inspection will ensure that measures implemented remain effective. In general, high flow areas will be protected with turf reinforcement mats. Any potential high flows from off site will be mitigated as they enter the construction site. Specific measures to be implemented may include the use of silt fence, rock construction entrance, check dams, biologs, sedimentation or stilling basins, erosion control blankets, and prompt re-vegetation of disturbed areas via seeding and mulch. A fiber blanket or hydraulic seed stabilizer may also be used. Erosion control and stormwater management measures will be outlined in the SWPPP prepared for the project. The SWPPP will be submitted to the MPCA for review and approval as part of the Stormwater Permit application process. 17. Water Quality Surface-water Runoff. a. Compare the quantity and quality of site runoff before and after the project. Describe permanent controls to manage or treat runoff. Describe any storm-water pollution prevention plans. As discussed above, the project will require a Stormwater Permit because it will disturb more than one acre of land. The Stormwater Permit requires the submittal of an application completed by the owner and operator and the preparation of an SWPPP designed in accordance with MPCA requirements. The SWPPP includes both temporary and permanent erosion and sediment control plans. Attachment 3 contains an overview of the NPDES/SDS Construction Stormwater Permit Program and lists the program requirements. The proposed project will comply with NPDES/SDS requirements. The entity responsible for ensuring compliance will be specified in the permit. Flagstaff Avenue Trunk Sewer Line Farmington, Minnesota 13 Environmental Assessment Worksheet

15 Because the sewer pipe will be buried, the quantity and quality of runoff before and after the project will not change significantly. Discharge from dewatering activities during excavation is discussed in Item 13 and will be conducted as stipulated in applicable permits and approvals (see Items 8, 13, and 16). b. Identify routes and receiving water bodies for runoff from the site; include major downstream water bodies as well as the immediate receiving waters. Estimate impact runoff on the quality of receiving waters. Receiving water bodies in the vicinity of the proposed project include wetlands, tributaries to the Vermillion River, the Vermillion River, and, ultimately, the Mississippi River. As discussed in Items 12 and 16, appropriate erosion and sediment control measures will be implemented during construction, and runoff from the site will be minimized. Because the sewer pipe will be placed below grade, and because the disturbance caused by construction of the pipe will be temporary, permanent significant impacts to receiving water bodies are not anticipated to be caused by the sewer project. Vegetation will be restored as soon as possible after construction. Fiber blankets, mulch and/or hydraulic seeding will be used where necessary to ensure prompt re-vegetation. The SWPPP and Stormwater Permit will outline specific time line provisions for re-vegetation. The contractor will comply with these time lines. As discussed previously, this project will enable future development within the service area. The effects of surface-water runoff from enabled development on water quality is discussed under Item 29 - Cumulative Impacts. 18. Water Quality Wastewater. a. Describe sources, composition and quantities of all sanitary, municipal and industrial wastewater produced or treated at the site. The Flagstaff Trunk Sewer will initially serve only the new Farmington High School to be constructed on the west side of Flagstaff. The school property is depicted on the attached figures. Sanitary flows are expected to be MGD when the school opens in At full capacity of the school (anticipated by year 2017), flows are expected to be MGD. The City s Comprehensive Plan does not provide for other development in the area until after Most of the land in the project area is designated urban reserve. Existing properties in the area will be required to maintain their on-site individual waste treatment systems. In the future, the trunk line will serve a 749-acre area of Farmington and possibly a 1,345-acre area of Lakeville (see Figure 5). The trunk line is being sized to accommodate both areas. At full build-out of the service areas, flows in the trunk line are anticipated to be 2.6 MGD. The wastewater is expected to be within the range of normal strength domestic wastewater. The average flows were calculated estimating flow for future residential and commercial/industrial land uses in the project service area. Flows have been estimated using residential equivalent units (REUs), which can be applied to both residential and non-residential land uses. Residential land uses were estimated as Low Density (3.0 units/acre over 50 percent of the area), Medium Density (7.15 units/acre over 45 percent of the area), and High Density (14.5 units/acre over 5 percent of the area). Low density area flows were determined using 90 gallons/capita/day, 270 gallons/unit/day and 3 persons/unit (i.e., 1 REU). Medium density flows were determined using 80 gallons/capita/day, Flagstaff Avenue Trunk Sewer Line Farmington, Minnesota 14 Environmental Assessment Worksheet

16 200 gallons/unit/day and 2.5 persons/unit (0.75 REU). High density area flows were determined using 70 gallons/capita/day, 140 gallons/unit/day and 2 persons/unit (0.50 REU). The EAW previously prepared for the new Farmington High School west of Flagstaff Avenue identified wastewater flow to be 45,000 gallons/day for the school. b. Describe waste treatment methods or pollution prevention efforts and give estimates of composition after treatment. Identify receiving waters, including major downstream water bodies, and estimate the discharge impact on the quality of receiving waters. If the project involves on-site sewage systems, discuss the suitability of site conditions for such systems. The areas within the cities of Farmington and Lakeville to be served by the proposed trunk sewer do not currently have centralized wastewater treatment and collection service. As expected, an area relying on on-site wastewater treatment systems is not likely to be the location for high-strength wastewater generators. There are no permitees registered in the MCES Industrial Waste Permit Program in the project service area, nor are any otherwise known to exist. The flow conveyed by the Flagstaff Trunk Sewer system will ultimately be treated at the MCES Empire Wastewater Treatment Plant (WWTP) located on the Vermillion River in Dakota County. The wastewater will be within the range of normal strength domestic wastewater. c. If wastes will be discharged into a publicly owned treatment facility, identify the facility, describe any pretreatment provisions and discuss the facility s ability to handle the volume and composition of wastes, identifying any improvements necessary. Sanitary sewer waste will be conveyed by the Farmington Trunk Sewer to the MCES Empire WWTP. The Empire WWTP is located on the Vermillion River in Dakota County and currently treats 9 MGD, according to a June 2006 Metropolitan Council publication. The WWTP s capacity is 12 MGD and it is currently undergoing an expansion to double its capacity. The expansion is expected to be operational in According to the Metropolitan Council publication, treated wastewater from the expanded Empire Plant will be conveyed 12 miles for discharge to the Mississippi River at a new outfall pipe on the river in Rosemount. In this way, harmful impacts to the environmentally sensitive Vermillion River will be avoided. Particularly with the expansion, the Empire WWTP will have ample capacity to treat the flows anticipated from the Farmington Trunk Sewer. The Flagstaff Avenue Trunk Sewer will discharge to MCES Interceptor , which conveys flow to the Empire WWTP in Empire Township. The existing MCES interceptor has capacity for the flows forecasted through the year In the future, the capacity of the MCES interceptor system will be increased as necessary to accommodate flows generated in the service area. The MCES has already started planning for a new interceptor to be located in Eureka and Castle Rock Townships. The MCES reviews all permits for sewer extensions in the areas tributary to their wastewater facilities. The MCES will not grant sewer extensions in areas where capacity is not available. d. If the project requires disposal of liquid animal manure, describe disposal technique and location and discuss capacity to handle the volume and composition of manure. Identify any improvements necessary. Describe any required setbacks for land disposal systems. Not applicable. Flagstaff Avenue Trunk Sewer Line Farmington, Minnesota 15 Environmental Assessment Worksheet

17 19. Geologic hazards and soil conditions. a. Approximate depth (in feet) to Ground water: See below minimum; See below average. Bedrock: See below minimum; See below average. Describe any of the following geologic site hazards to ground water and also identify them on the site map: sinkholes, shallow limestone formations or karst conditions. Describe measures to avoid or minimize environmental problems due to any of these hazards. In order to ascertain the geologic conditions at the site, the following Minnesota Geological Survey publication was reviewed: Geologic Atlas, Dakota County, Minnesota, N.H. Balaban and Howard C. Hobbs, County Atlas Series Atlas C-6, Minnesota Geological Survey, University of Minnesota, St. Paul, Minnesota, According to the geologic atlas, surficial geology along the project corridor varies. At the southern end of the corridor, the sediments consist of floodplain alluvium deposits of poorly bedded, moderately well sorted sediments deposited by modern streams during flood stage. The sediments consist mainly of sand typically interbedded with organic-rich layers and buried soil. In the middle section of the project corridor, the sediments consist of mixed outwash deposits of sand, loamy sand, and gravel. Surficial geology in the northern third of the project corridor consists of loess deposits of uniform unbedded silt and fine sand mixed with clay. Grey calcareous till is present in other parts of the corridor. The till deposits consist of two undivided tills. The upper till is friable loam to fine sandy loam and the lower till is firm loam to clay loam. Because of extensive erosion, the lower till is at the surface in many areas, according to the geologic atlas. Information from the geologic atlas differs somewhat from the information collected from the soil borings completed by American Engineering & Testing. Information gathered from the borings indicates the soils are more clay-like throughout the corridor. The uppermost bedrock unit in the northern third of the project corridor is the St. Peter Sandstone. In the southern two-thirds, the uppermost unit is the Prairie du Chien. The depth to bedrock is estimated to be feet below grade for most of the corridor. The geologic atlas indicates bedrock is feet below the surface in a narrow swath that crosses the corridor south of CSAH 50. Groundwater flow in both the glacial drift sediments and the bedrock aquifer (Prairie du Chien Jordan aquifer) is indicated to be to the east. The depth to water varies along the corridor and is known to be shallow in wetland areas. Water was encountered at 40 percent of the soil boring locations at depths of 4 to 23 feet below grade. Two private wells in the project area indicate water is present in the drift material at 14 to15 feet below grade. Other wells in the area installed in the bedrock aquifers indicate water is present at 19 to 70 feet below grade. Environmental hazards, such as sinkholes, shallow limestone formations or karst conditions, are not known to be present in the area. Flagstaff Avenue Trunk Sewer Line Farmington, Minnesota 16 Environmental Assessment Worksheet

18 b. Describe the soils on the site, giving Soil Conservation Service (SCS) classifications, if known. Discuss soil granularity and potential for ground-water contamination from wastes or chemicals spread or spilled onto the soils. Discuss any mitigation measures to prevent such contamination. Soils data for Dakota County was obtained through the United States Department of Agriculture (USDA) Natural Resource Conservation Service (NRCS) National Cartography and Geospatial Center and using the Soil Survey Geographic Database. A brief description of soil mapping units occurring in the project area is provided in the table below. A map of the soil unit locations is provided as Figure 9. Soil Types Soil Unit Symbol Soil Name Permeability Special Considerations 2B Ostrander loam, 1-6% Moderate Prime farmland slopes 2C Ostrander loam, 6-12% slopes Moderate Farmland soil of statewide importance 39B Wadena loam, 2-6% slopes Moderate in loamy mantle; rapid in sandy Prime farmland 41B Estherville sandy loam, 2-6% slopes 98 Colo silt loam, occasionally flooded underlying material Moderately rapid in loamy mantle; rapid in the underlying material Moderate 129 Cylinder loam Moderate in loamy mantle; very rapid in the underlying material Farmland soil of statewide importance Hydric, prime farmland if protected from flooding or not frequently flooded during the growing season Prime farmland 76 Garwin silt clay loam Moderate Hydric, prime farmland if drained 203B Joy silt loam, 1-5% slopes Moderate Prime farmland 208 Kato silty clay loam Moderate in the silty mantle; rapid in the underlying material Hydric, prime farmland if drained 213B Klinger silt loam, 1-5% slopes Moderate 252 Marshan silty clay loam Moderate in the upper loamy mantle; rapid in underlying sandy material 255 Mayer silt loam Moderate in the upper mantle; rapid in the underlying material 285B Port Byron silt loam, 2-6% slopes 285C Port Byron silt loam, 9-12% slopes Moderate Moderate - continued - Prime farmland Hydric, prime farmland if drained Hydric, prime farmland if drained Prime farmland Farmland soil of statewide importance Flagstaff Avenue Trunk Sewer Line Farmington, Minnesota 17 Environmental Assessment Worksheet

19 Soil Unit Symbol Soil Name Permeability Special Considerations 301B Lindstrom silt loam, 1- Moderate Prime farmland 4% slopes 320C2 Tallula silt loam, 6-12% slopes, eroded Moderate Farmland soil of statewide importance 411A Waukegan silt loam, 0-1% slopes Moderate in the silty mantle; rapid in the sandy underlying Prime farmland 411B Waukegan silt loam, 1-6% slopes material Moderate in the silty mantle; rapid in the sandy underlying material Prime farmland 540 Seelyeville muck Moderately rapid Hydric 963D2 Timula-Bold silt loams, Moderate % slopes, eroded 963E2 Timula-Bold silt loams, 18-25% slopes, eroded Moderate -- *Hydric soils were identified using the Hydric Soils of Minnesota list, revised December Prime and important farmland soils information was obtained from the USDA NRCS Electronic Office Field Technical Guide at Permeability information was obtained from the Dakota County Soil Survey (USDA SCS, 1983). In general, water moves through coarse textured soils at a faster rate than through medium or fine textured soils. Therefore, potential impacts to ground water from spilled chemicals would be expected to be greater in areas with coarse textured soils. However, many factors in addition to soil granularity can affect infiltration and percolation rates in soils. Some of these factors include soil water content, soil frost, the temperature of soil and water, surface roughness, the nature of the soil pore openings, vegetative ground cover, and the degree of soil compaction. The ground-water sensitivity map from the geologic atlas indicates ground-water sensitivity to pollution in the project area varies along the project corridor. It is low in the northern part, low-moderate in the central part, and high in the southern part. However, due to the nature of the project (sanitary sewer line), the potential for impacts to ground water from wastes or chemicals spread or spilled onto the soils is minimal. 20. Solid Wastes, Hazardous Wastes, Storage Tanks. a. Describe types, amounts and compositions of solid or hazardous wastes, including solid animal manure, sludge and ash, produced during construction and operation. Identify method and location of disposal. For projects generating municipal solid waste, indicate if there is a source separation plan; describe how the project will be modified for recycling. If hazardous waste is generated, indicate if there is a hazardous waste minimization plan and routine hazardous waste reduction assessments. Construction activities will generate waste materials such as trees, fence wire and posts, aggregate base, bituminous pavement, reinforced concrete pipe, concrete, PVC pipe, ductile iron pipe, survey stakes, silt fence, corrugated metal pipe, metal posts, signs, and timber posts. These materials will be disposed of by the contractor in accordance with applicable state and local rules and regulations. b. Identify any toxic or hazardous materials to be used or present at the site and identify measures Flagstaff Avenue Trunk Sewer Line Environmental Assessment Worksheet Farmington, Minnesota 18

20 to be used to prevent them from contaminating groundwater. If the use of toxic or hazardous materials will lead to a regulated waste, discharge or emission, discuss any alternatives considered to minimize or eliminate the waste, discharge or emission. During construction, equipment and vehicles utilizing gasoline, diesel fuel, antifreeze, and oil will be used at the project site. Portable storage tanks of fuel may be temporarily located at the site during construction. Fueling of vehicles and equipment will be conducted away from sensitive areas. Any spill that would occur would be cleaned up immediately, and reported to the Minnesota Duty Officer if greater than five gallons. c. Indicate the number, location, size and use of any above or below ground tanks to store petroleum products or other materials, except water. Describe any emergency response containment plans. As discussed above, portable storage tanks of fuel may be temporarily located at the site during construction. 21. Traffic. Parking spaces added: 0 Existing spaces (if project involves expansion): 0 Estimated total average daily traffic generated: NA Estimated maximum peak hour traffic generated (if known) and its timing: NA Provide an estimate of the impact on traffic congestion affected roads and describe any traffic improvements necessary. If the project is within the Twin Cities metropolitan area, discuss its impact on the regional transportation system. A noticeable permanent increase in traffic will not occur directly due to construction of the project, per se. The only increase in traffic resulting directly from the project would be that due to construction of the project, and that due to maintenance of the sewer line. During the construction process, construction vehicles will be utilizing county roads and local streets. Delivery of pipe, concrete and other materials will be restricted to the county roads where possible. In addition, tunneling under County Road 50 is not expected to result in major traffic impacts, although minimal traffic disruption, such as minor slow-downs, may occur during the short period of tunneling. In the future, traffic in the vicinity of the project is likely to increase with increased urban development. Residential, commercial, and other types of development will be enabled as a result of the project. It is the primary purpose of the project to provide wastewater collection and conveyance for the new Farmington High School, but it will ultimately serve the areas of the cities of Farmington and Lakeville indicated on Figure 5. It will be necessary for the Minnesota Department of Transportation, Dakota County, and the City to work together to provide appropriate roadway improvements and measures to mitigate traffic congestion. 22. Vehicle-related Air Emissions. Estimate the effect of the project s traffic generation on air quality, including carbon monoxide levels. Discuss the effect of traffic improvements or other mitigation measures on air quality impacts. Note: If the project involves 500 or more parking spaces, consult EAW Guidelines about whether a detailed air quality analysis is needed. Vehicle emissions directly associated with the project will not have a significant effect on air quality. However, residential and other development enabled by the construction of wastewater conveyance capacity may result in measurable, but not likely significant impacts. If traffic increases due to the enabled development result locally in future deterioration in levels of service and/or air quality violations, mitigative measures are available. These measures include roadway improvements, signal installation, and provision of alternative transportation choices. 23. Stationary Source Air Emissions. Describe the type, sources, quantities and compositions of any Flagstaff Avenue Trunk Sewer Line Farmington, Minnesota 19 Environmental Assessment Worksheet

21 emissions from stationary sources of air emissions such as boilers, exhaust stacks or fugitive dust sources. Include any hazardous air pollutants (consult EAW Guidelines for a listing), any greenhouse gases (such as carbon dioxide, methane, and nitrous oxides), and ozone-depleting chemicals (chlorofluorocarbons, hydrofluorocarbons, perfluorocarbons or sulfur hexafluoride). Also describe any proposed pollution prevention techniques and proposed air pollution control devices. Describe the impacts on air quality. There will be no stationary source air emissions associated with the proposed project. 24. Odors, noise and dust. Will the project generate odors, noise or dust during construction or during operation? Yes No If yes, describe sources, characteristics, duration, quantities or intensity and any proposed measures to mitigate adverse impacts. Also identify locations of nearby sensitive receptors and estimate impacts on them. Discuss potential impacts on human health or quality of life. (Note: fugitive dust generated by operations may be discussed at item 23 instead of here.) Dust and noise will be generated by equipment and machinery during construction. Odors may also be generated from construction equipment exhaust. Equipment will include trucks, backhoes, graders, compactors, excavators, bobcats, cranes, loaders, compressors, and possibly de-watering pumps. Dust may be controlled by daily cleanup of the construction site; water will be used to wet appropriate surfaces to reduce airborne dust when necessary. Noise and odor impacts from construction equipment will be controlled by restricting the hours of operation to daylight hours, or those permitted by local ordinances. The nearest receptors are farmsteads and rural residences along or near the proposed alignment. Average exposure times are estimated to be of short duration. As in any sanitary sewer system, there is potential for odors to form during operation of the proposed system. Hydrogen sulfide has the potential to form in sewage material under anaerobic conditions, and can produce a rotten-egg odor, particularly where flow turbulence releases gas from solution in the wastewater. This project is similar to most sanitary sewers in the Metropolitan area, where slopes are mild and turbulence is low, which helps minimize the release of odors. The need for odor control is not anticipated for this project. However, if it becomes necessary in the future, there are a number of options to consider, such as adding chemicals to the sanitary system to suppress growth of odor-causing bacteria, and filtering air ventilated from the sewer system through a biofilter or through a carbon filtration system. 25. Nearby resources. Are any of the following resources on or in proximity to the site? a. Archaeological, historical, or architectural resources? Yes No b. Prime or unique farmlands or land within an agricultural preserve? Yes No c. Designated parks, recreation areas, or trails? Yes No d. Scenic views and vistas? Yes No e. Other unique resources? Yes No If yes, describe the resource and identify any project-related impacts on the resources. Describe any measures to minimize or avoid adverse impacts. Archaeological, Historical, or Architectural Resources The SHPO was contacted regarding the potential presence of cultural resources in the project corridor vicinity. The SHPO s review of the Minnesota Archaeological Inventory and Historic Structures Inventory did not identify archaeological sites in the project area, but did identify several historic structures in the vicinity (see Attachment 4). None of the historic structures appears to be located directly adjacent to the project corridor, so none would be directly impacted during the construction process. Indirect affects are also not anticipated as the sewer will be placed below grade. Flagstaff Avenue Trunk Sewer Line Farmington, Minnesota 20 Environmental Assessment Worksheet

22 Prime or Unique Farmlands, Lands within an Agricultural Preserve There are soils within the project area that have been designated as important to farming (see table of soil types in Item 19). Currently, the project area (other than the new high school property) is zoned to remain in agricultural use. In the future, however, it is likely that some of the agricultural land will be taken out of production. Development will be subject to the comprehensive plan and zoning regulations of the City. Conversion of agricultural land to urban land is a consequence of population growth. Designated Parks, Recreation Areas or Trails The trunk sewer line does not extend through any designated park areas, although it extends through or near areas designated as natural open space by the City s 2020 Comprehensive Land Use Plan map. The areas are associated with small streams or drainage ways that intersect the project corridor and the Vermillion River tributary near the southern end of the alignment. The Farmington Future Parks, Trails & Open Space Map indicates there is an existing trail along the north side of CSAH 50 that crosses the project corridor. In addition, a future bituminous bike trail is planned to extend through an area east of the project corridor. Permanent impacts to these amenities are not anticipated as the project will be placed below grade. However, temporary impacts (such as noise, dust, and general disruption caused by construction machinery) may occur to users of the facilities during construction of the project. These impacts are expected to be short-lived and not significant. Scenic Views and Vistas The project corridor extends through an agricultural area of the City. Some wooded and wetland areas are present. There are no officially designated scenic views or vistas along the corridor. Due to the sub-grade nature of the project, any scenic views and vistas that might be considered present would not be impacted once construction has been completed. Other Unique Resources As discussed previously, a tributary to the Vermillion River flows past the southern end of the project corridor. Construction activities will not encroach on the creek as the proposed connection to the MCES interceptor is on the north side of the creek. The erosion and sediment control measures and stormwater management practices to be implemented for the project will ensure that impacts to the creek are avoided or minimized (see Items 11, 12, 13, and 16). 26. Visual impacts. Will the project create adverse visual impacts during construction or operation? Such as glare from intense lights, lights visible in wilderness areas and large visible plumes from cooling towers or exhaust stacks? Yes No If yes, explain. No such impacts are anticipated. 27. Compatibility with plans and land use regulations. Is the project subject to an adopted local comprehensive plan, land use plan or regulation, or other applicable land use, water, or resource management plan of a local, regional, state or federal agency? Yes No Flagstaff Avenue Trunk Sewer Line Farmington, Minnesota 21 Environmental Assessment Worksheet

23 If yes, describe the plan, discuss its compatibility with the project and explain how any conflicts will be resolved. If no, explain. The proposed project is subject to the City of Farmington Comprehensive Plan (February 2000) and amendments thereto, the City of Farmington Comprehensive Sanitary Sewer Plan (May 1996), City ordinances, VRWJPO rules, and Metropolitan Council plans for sanitary service. The service area (Figure 5) for the proposed trunk line includes approximately 749 acres of Farmington and 1,135 acres of Lakeville. The 1976 Metropolitan Land Planning Act requires local governments to prepare comprehensive plans and submit them to the Metropolitan Council to determine their consistency with Metropolitan system plans. The local comprehensive plan is to include a sewer element addressing the collection and disposal of wastewater generated by the community. Further, under Minn. Stat , local governments are required to submit a Comprehensive Sewer Plan (CSP) describing service needs from the MCES to the Metropolitan Council for its approval. These are known as Tier II Plans. The CSP is broader in scope than the sewer element of the local comprehensive plan and provides detailed sewer system engineering information. The CSP for the City outlines potential alignments and sizing for city trunk sewers, as well as connection points to the metropolitan interceptor system. A Comprehensive Plan Amendment was prepared by the City to allow for the extension of utility services to the school. The amendment has been approved by the Metropolitan Council. Prior to the amendment, utility services were not planned for extension to the project area until after Even with the amendment, development other than the school is not planned until after Most of the project area is zoned urban reserve. With the amendment, the project is consistent with the City plans and ordinances to which it is subject. The project will comply with watershed VRWJPO requirements. The City review and approval process will regulate land use changes within the project service area. 28. Impact on infrastructure and public services. Will new or expanded utilities, roads, other infrastructure or public services be required to serve the project? Yes No If yes, describe the new or additional infrastructure or services needed. (Note: any infrastructure that is a connected action with respect to the project must be assessed in the EAW; see EAW Guidelines for details.) Although the trunk sewer will not require additional infrastructure, future development within its service area will. Although not anticipated in the near future, as development of the area is proposed, other utilities and infrastructure, such as roads, collector streets, collector and lateral sewer lines, potable water distribution systems, stormwater collection and treatment systems, schools, police, and fire protection, and other urban services will be needed to service the area. Adherence to City development plans and ordinances will ensure coordination of infrastructure for enabled development. 29. Cumulative impacts. Minn. R , subp. 7, item B requires that the RGU consider the cumulative potential effects of related or anticipated future projects when determining the need for an environmental impact statement. Identify any past, present or reasonably foreseeable future projects that may interact with the project described in this EAW in such a way as to cause cumulative impacts. Describe the nature of the cumulative impacts and summarize any other available information relevant to determining whether there is potential for significant environmental effects due to cumulative impacts (or discuss each cumulative impact under appropriate item(s) elsewhere on this form). The proposed project itself is not anticipated to directly interact with any past, present, or reasonably foreseeable future projects in such a way as to cause cumulative effects. Existing development in the Flagstaff Avenue Trunk Sewer Line Farmington, Minnesota 22 Environmental Assessment Worksheet

24 project service area includes farmsteads and scattered rural residences. With regard to future projects, the new Farmington High School is currently the only project that is actually planned within the service area of the project in both of the cities Farmington and Lakeville. Although no additional developments have yet been proposed, it is recognized that construction of the sewer line will enable future development within the service areas of the cities of Farmington and Lakeville. The sewer pipe is sized to accommodate the future growth of the combined service areas. The cities of Farmington and Lakeville are currently preparing Comprehensive Plan updates to meet Metropolitan Council s requirements for completion in The service area land uses in both cities are currently generally described as urban reserve. During the public process, the cities may experience pressure to allow utility staging in the service area sooner than the current Comprehensive Plans allow. Because any development beyond the new high school is not yet even in the planning stages, and is dependent on local economics, it is very difficult to assess the potential for cumulative effects from development enabled by the proposed project. We can, however, discuss in general terms what the primary cumulative potential effects associated with development enabled by completion of a sewer interceptor to a mainly rural landscape are likely to be. One of the main cumulative potential effects of this type of development is that of stormwater runoff impacts to nearby water resources, as land use is changed over time from rural to urban. In the area of the proposed project, there are several measures in place (described below) to mitigate such potential impacts from the new high school and any other future developments, which is particularly important given the presence of the ecologically-sensitive Vermillion River and its tributaries in the vicinity of the project. In addition, individual development projects may be subject to environmental review and the preparation of project-specific EAWs or an Alternative Urban Areawide Review. Any construction that disturbs an acre or more of land requires a Stormwater Permit, to include an SWPPP, from the MPCA. The cities of Farmington and Lakeville currently have adopted surface water management plans and ordinances that address surface water runoff. Both cities are preparing to update their plans to meet the Metropolitan Council s requirements for the 2008 Comprehensive Plan updates. The plans include information to address the treatment of stormwater runoff to address downstream water quality issues. Specific documents that address stormwater management and other controls to which future development in the project service area may be subject include: Vermillion River Watershed Joint Powers Organization Watershed Plan, adopted November 3, applies to all areas within the watershed. The plan describes how the VRWJPO will address activities in the watershed and is intended as a guide to be used until It identifies priority watershed issues and VRWJPO goals related to surface water quantity and quality, open space and recreational uses, wetlands and habitat, ground water, land use management, floodplains, and education. Available by calling to purchase a CD or paper copy of the plan. Vermillion River Watershed Joint Powers Organization Standards, dated October 26, applies to all areas within the watershed. This document lists policies, standards, and requirements for protecting water bodies in the watershed through management of stormwater runoff for temperature, rate, quantity, quality; also provides requirements for erosion and Flagstaff Avenue Trunk Sewer Line Farmington, Minnesota 23 Environmental Assessment Worksheet

25 sediment control. The standards are a minor amendment to the Watershed Plan and are published as a companion document to the plan. Available at: ionjpofinalstandards pdf Vermillion River Watershed Joint Powers Organization Rules, Draft dated December 7, 2006 applies to all areas within the watershed. This document lists policies and requirements for protecting water bodies in the watershed through management of stormwater runoff for temperature, rate, quantity, quality; also provides requirements for erosion and sediment control. After adoption, the watershed rules will govern certain land use and alteration activities within the Vermillion River Watershed. The rules will be the implementation mechanism for the standards. Available at: illionjpodraftrules pdf Vermillion River Watershed Stream Classifications and Buffer Standards, adopted October 26, 2006 applies to areas within the watershed that drain to streams with special classifications. Stipulates required BMPs and buffer widths for the different classifications. Available at: mclassificationsystem.pdf Associated map is also available at: ershedvermillionwaterwaysfinal11x17.pdf Farmington Surface Water Management Plan, dated September 1997 (update in progress) applies to all areas within the City. Chapters 2 and 4 provide information regarding goals, policies and strategies for managing stormwater runoff (quantity and quality) and protecting water bodies within the City. Available at City offices. Farmington City Code, as periodically amended applies to all areas within the City. The City Code contains ordinances related to development (including subdivisions, site plan review, platting, lots, landscaping, turf establishment, etc.), zoning, wetlands, shoreland management regulations, stormwater management, erosion control requirements, etc. Available at: Farmington MS4 Permit (General Stormwater Permit (MN R ) Application for Small Municipal Separate Storm Sewer Systems [MS4s]) - applies to all areas within the City. The City is required to follow NPDES Phase II Permit requirements to obtain authorization to discharge pollutants to surface water. NPDES is mandated by the U.S. Environmental Protection Agency (EPA) as part of the Federal Clean Water Act. A copy of the MPCA Permit is available at: Phase II requires the City to develop a stormwater management plan designed to prevent harmful pollutants from being washed by stormwater runoff into the municipal storm sewer and then discharged from the storm sewer into local water bodies. The Stormwater Pollution Prevention Program needs to include six minimum control measures. Each minimum control measure is comprised of BMPs, and each BMP will have measurable goals that serve to track the effectiveness of the BMP. The permit is updated annually and, in summary, it outlines BMPs the City requires for development and other kinds of projects, ongoing maintenance, inspection, development and implementation of ordinances, zoning, and education programs, etc. It is available at: BMP%20Sheets.pdf Flagstaff Avenue Trunk Sewer Line Farmington, Minnesota 24 Environmental Assessment Worksheet

26 Lakeville Surface Water Management Plan, dated July 1995 (update in progress) applies to all areas within the city of Lakeville. The plan provides information regarding goals, policies and strategies for managing stormwater runoff (quantity and quality) and protecting water bodies within the city. Available at city offices. Lakeville City Code, as periodically amended applies to all areas within the city of Lakeville. The City Code contains ordinances related to development (including subdivisions, site plan review, platting, lots, landscaping, turf establishment, etc.), zoning, wetlands, shoreland management regulations, stormwater management, erosion control requirements, etc. Available at: Lakeville MS4 Permit (General Stormwater Permit (MN R ) Application for Small Municipal Separate Storm Sewer Systems [MS4s]) - applies to all areas within the city of Lakeville. The city of Lakeville is required to follow NPDES Phase II Permit requirements to obtain authorization to discharge pollutants to surface water. NPDES is mandated by the EPA as part of the Federal Clean Water Act. Phase II requires Lakeville to develop a stormwater management plan designed to prevent harmful pollutants from being washed by stormwater runoff into the municipal storm sewer and then discharged from the storm sewer into local water bodies. The Stormwater Pollution Prevention Program needs to include six minimum control measures. Each minimum control measure is comprised of BMPs, and each BMP will have measurable goals that serve to track the effectiveness of the BMP. The permit is updated annually and in summary, it outlines BMPs the City requires for development and other kinds of projects, ongoing maintenance, inspection, development and implementation of ordinances, zoning, and education programs, etc. The City s SWPPP is available at: In addition, both cities are currently working on their non-degradation plans and Vermillion River requirements. 30. Other Potential Environmental Impacts. If the project may cause any adverse environmental impacts not addressed by items 1 to 28, identify and discuss them here, along with any proposed mitigation. Environmental impacts other than those previously discussed in this EAW are not anticipated as a result of the proposed project. 31. Summary of issues. List any impacts and issues identified above that may require further investigation before the project is begun. Discuss any alternatives or mitigative measures that have been or may be considered for these impacts and issues, including those that have been or may be ordered as permit conditions. The City must acquire the previously mentioned permits and approvals prior to proceeding with construction. Detailed plans and specifications must be reviewed and approved prior to construction. Issues identified in this EAW that may require additional investigation include: Erosion and sediment control plans will be prepared and submitted for review to appropriate agencies prior to construction. Proposed wetland impacts must be authorized by the LGU prior to impacting the wetlands. Flagstaff Avenue Trunk Sewer Line Farmington, Minnesota 25 Environmental Assessment Worksheet

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44 PROPOSED TRUNK SEWER ALIGNMENT CITY OF FARMINGTON DAKOTA COUNTY N Rosene Anderlik & Associates W E S

45 195TH STREET CEDAR AVENUE 200TH STREET PROPOSED TRUNK SEWER ALIGNMENT CSAH 50 FLAGSTAFF AVENUE PILOT KNOB ROAD FAIRGREEN AVENUE USGS Topographic Map City of Farmington Flagstaff Avenue Improvements K:\141\ \Cad\Dwg\EAW Figures\USGS.apr Feet Figure 2 N W E S

46 200TH STREET PROPOSED HIGH SCHOOL FLAGSTAFF AVENUE FAIRGREEN AVENUE CSAH 50 PROPOSED TRUNK SEWER ALIGNMENT EX. MCES SEWER N Rosene Anderlik & Associates W E

47 Elm St 215th St E 225th St W Emery Ave Hampton Ave Blaine Ave E &V$T Uq $T $T $T $T $T $T Biscayne Ave $T P R Pilot Knob Rd Farmington $B $T$T 195th St W 197th St W Vermillion River Tr Akin Rd Uz $T PÊR 210th St W 212th St W Ash St 220th St E 225th St W SOO LINE RAILROAD 230th St W Flagstaff Ave Denmark Ave Ave W Annette Ave Darson Ave 230th St W 190th St W Vermillion River Ahern Blvd anch) Flagstaff Ave 200th St W Lakeville Blvd 225th St W Cedar Ave 190th St W ville Apple Valley Rosemount U Lakeville Empire Township EMPIRE WWTP Vermillion Township 170th St W 170th St W Proposed Trunk Sewer Coates Existing MCES Regional Sewer System Figure 4 $B Empire WWTP $B Existing Meter Station &V Existing Lift Station Proposed Trunk Sewer Existing MCES Interceptor Township Municipality River/Creek Road Railroad Feet JANUARY 2007 k:\141\ \gis\avp\mces.apr amburg Ave E RAILR

48 179TH ST W LAKEVILLE SERVICE AREA 190TH STREET 195TH STREET 202ND STREET 200TH STREET FARMINGTON SERVICE AREA HAMBURG AVENUE CEDAR AVENUE PROPOSED HIGH SCHOOL FLAGSTAFF AVENUE FAIRGREEN AVENUE CSAH TH STREET PROJECT SERVICE AREA BY CITY PROPOSED TRUNK SEWER ALIGNMENT EX. MCES SEWER FARMINGTON LAKEVILLE N Rosene Anderlik & Associates W E

49 WETLAND F 200TH STREET WETLAND E WETLAND D WETLAND C PROPOSED HIGH SCHOOL FLAGSTAFF AVENUE FAIRGREEN AVENUE CSAH 50 WETLAND B PROPOSED TRUNK SEWER ALIGNMENT WETLAND A EX. MCES SEWER N Rosene Anderlik & Associates W E

50 PEMAd PEMCd PSS1Cd PEMC PEMCd 200TH STREET PEMCd PUBGx PEMAd PSS1Cd PEMCd PEMAd PSS1Cd PEM/SS1Cd PSS1Cd PEM/SS1Cd PEMC PEMCd PUBGx PFO1Cd PEMCd PROPOSED HIGH SCHOOL PEMCd FLAGSTAFF AVENUE PSS1Cd FAIRGREEN AVENUE CSAH 50 PEMAd PEMCd PEM/FO1Cd PEMA PROPOSED TRUNK SEWER ALIGNMENT PEMCd PEMCd PEMAd PUBGx PEM/SS1Cd PEMCd PEMCd EX. MCES SEWER N Rosene Anderlik & Associates W E

51 19-352W 190TH STREET 195TH STREET W 200TH STREET CEDAR AVENUE TRIBUTARY TO THE VERMILLION RIVER PROPOSED HIGH SCHOOL FLAGSTAFF AVENUE FAIRGREEN AVENUE PILOT KNOB ROAD 208TH CSAH 50 H STREET TRIBUTARY TO THE VERMILLION RIVER PROPOSED TRUNK SEWER ALIGNMENT EX. MCES SEWER FEMA 100 Year Floodplain FEMA 500 Year Floodplain Public Waters Inventory 225TH STREET N Rosene Anderlik & Associates W E

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