Agenda - Planning Commission - 05/04/2017 - Special

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Pearson Farm Residential Development EAW Draft — March XX, 2017 Impaired waters listed by the Minnesota Pollution Control Agency (MPCA) and located within 1 mile of the site include the Mississippi River (07010206-567), which is impaired for mercury and PCBs in fish tissue between the Crow River and the northwestern limits of the City of Anoka. ii. Groundwater — aquifers, springs, seeps. Include: 1) depth to groundwater; 2) if project is within a MDH wellhead protection area; 3) identification of any onsite and/or nearby wells, including unique numbers and well logs if available. If there are no wells known on site or nearby, explain the methodology used to determine this. Depth to groundwater varies across the project area. Depth to surficial groundwater may be as little as one foot in the wetlands on the site during the spring. Depth to static groundwater levels based on domestic water wells located near the project area ranges from 28 to 41 feet (Table 6, Appendix B). Geotechnical borings completed by Northern Technologies on December 30, 2016, indicate the depth to groundwater ranged from about 4.5 to 18.5 feet below existing grade. This correlates to an approximate elevation range of 858.5 to 874.5 feet. Groundwater was at elevations of 858.5 to 860.5 feet in most of the borings where groundwater was encountered. The project area does not fall within a MDH wellhead protection area. Although a number of groundwater wells are located near the site, review of the Minnesota County Well Index did not identify any wells located onsite. Table 6. Domestic Water Wells located near the Pearson Farm site Depth to Surface Cased Location Well Elevation (feet) Depth Depth Static Bedrock (Direction Aquifer No. Water (feet) (feet) Level (feet) (feet) from Site) 541778 883 66 63 28 Southwest Tunnel City-Wonewoc 227345 883 75 71 30 Southwest Tunnel City-Wonewoc 430232 883 338 294 30 116 East Tunnel City-Wonewoc 783804 885 155 113 28 107 Northeast Tunnel City-Wonewoc 227037 886 156 141 41 110 Northeast Tunnel City-Wonewoc The project will be served by the City of Ramsey municipal water supply. The City has eight water supply wells that are all located at least one mile east of the project area. b. Describe effects from project activities on water resources and measures to minimize or mitigate the effects in Item b. i. through Item b. iv. below. i. Wastewater - For each of the following, describe the sources, quantities and composition of all sanitary, municipal/domestic and industrial wastewater produced or treated at the site. 1) If the wastewater discharge is to a publicly owned treatment facility, identib, any pretreatment measures and the ability of the facility to handle the added water and waste loadings, including any effects on, or required expansion of municipal wastewater infrastructure. The project is expected to produce normal domestic wastewater that is typical of residential developments. The project will not include industrial wastewater production or onsite wastewater treatment. 11