Agenda - Planning Commission - 08/02/2018

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North Dayton Development AUAR footing elevations be composed of granular soils. Any fill depths in excess of 10 feet in thickness below footings should consist of granular soil (sand containing less than 10 percent, by weight, of particles passing a size No. 200 sieve) to minimize the risk of detrimental settlement. ■ Fill and backfill should be placed in loose lifts no thicker than 12 inches. 11. Water Resources a. Describe surface water and groundwater features on or near the site in a.i. and a.ii. below. i. Surface water - lakes, streams, wetlands, intermittent channels, and county/judicial ditches. Include any special designations such as public waters, trout stream/lake, wildlife lakes, migratory waterfowl feeding/resting lake, and outstanding resource value water. Include water quality impairments or special designations listed on the current MPCA 303d Impaired Waters List that are within 1 mile of the project. Include DNR Public Waters Inventory number(s), if any. Several wetlands are located within the AUAR study area including the following Unnamed DNR Wetlands; 27-104, 27-215, 27-216, 27-217, and 27-124 (also listed as a natural environment lake). The Mississippi River is located just north of the site. The stretch of the river in the vicinity of the project is impaired for fecal coliform, nutrients, polychlorinated biphenyls in fish tissue, and mercury in fish tissue. The study area is located within one mile of two additional impaired waterbodies: Diamond Creek and Diamond Lake (27-125). Diamond Creek is impaired for E. Coli and dissolved oxygen. Diamond Lake is impaired for nutrients. These waterbodies are located south of the study area and do not receive runoff from the study area. 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 is estimated at approximately 65 feet below ground level. According to the Minnesota Well Index seven private wells are identified within the study area. The Minnesota Well Index also identifies fourteen test wells within the study area. No geotechnical report is proposed for the site at this time. The development site is located within the vicinity of the proposed North Dayton Well Field. Once completed, the North Dayton Well Field will supply water to future developments within the North Dayton District. The study area is not within an identified MDH wellhead protection 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, identify any pretreatment 20