08-01-2022 Council Work Session Packet

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aALLIANT ENVIRONMENTAL ASSESSMENT WORKSHEET II Robinson Sod Farm PAGE 14 • Stabilization of exposed soils within the time limits specified in the General NPDES permit • Inlet protection around any stormwater inlets on site • Energy dissipation, such as riprap, installed at storm sewer outfalls • Use of cover crops, native seed mixes, sod, and landscaping to stabilize exposed surface soils after final grading. A complete list of BMPs will be described in the Storm Water Pollution Prevention Plan (SWPPP) prepared for this project. iii. Water appropriation — Describe if the project proposes to appropriate surface or groundwater (including dewatering). Describe the source, quantity, duration, use and purpose of the water use and if a DNR water appropriation permit is required. Describe any well abandonment. If connecting to an existing municipal water supply, identify the wells to be used as a water source and any effects on, or required expansion of, municipal water infrastructure. Discuss environmental effects from water appropriation, including an assessment of the water resources available for appropriation. Identify any measures to avoid, minimize, or mitigate environmental effects from the water appropriation. Water Appropriation The City of Lino Lakes anticipates that the municipal water supply system will be able to meet the projected demand without expanding its current MN DNR water appropriation permit (#1985- 6168). Temporary groundwater appropriation may be necessary during construction for mass grading and to install utilities. Temporary construction dewatering greater than 10,000 gallons per day or 1 million gallons per year and less than 50 million gallons per year will require authorization under DNR General Permit 1997-0005. Well Abandonment As mentioned in Section 11.a.ii., the Minnesota County Well Index indicated that there are two wells located on the northern parcel near the two existing residence. Both wells will be sealed and removed using the MDH regulations prior to development in the area in order to mitigate for potential groundwater contamination. Connection to Existing Municipal Water Supply The City of Lino Lakes has constructed a 12" trunk watermain that is located at the southwest corner of the development in Robinson Drive. The trunk watermain extension included in this project will provide domestic water service for the proposed development and future developments in the area. Water for the project will be supplied by the City of Lino Lake's public water supply system which consists of six active MN DNR permitted groundwater production wells, three elevated storage tanks, a booster station, and a system of trunk and lateral watermains ranging in diameter from 6 to 16 inches. The city does not treat its water at a central treatment facility and instead provides chemical addition at each well to disinfect, prevent tooth decay, and control iron and manganese precipitation. The water in the six wells is pumped from the Jordan Sandstone Aquifer and meets all health requirements. No surface water supply is currently available (City of Lino Lakes, 2020).