2017.04.17 CC Packet - Laserfiche WebLink

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Adelaide Landing Residential Development EAW, Hugo January 31, 2017 82026000. A second private ditch system is located within the site and generally flows north towards the DNR public waters wetland. Drainage will be maintained to this ditch through adjacent stormwater ponds, aesthetic ponds, and wetlands. Impaired Waters According to the Minnesota impaired waters inventory and the MPCA's impaired waters viewer (IWAV, accessed 2016), one impaired water Hardwood Creek is located within the Project or within half a mile of the Project. Two impaired waters are located within a mile of the Project and include Clearwater Creek and Bald Eagle Lake. Hardwood Creek is located east of the Project and is impaired for dissolved oxygen; however, it is not in a contributing watershed. Clearwater Creek is located west of the Project and is impaired for Aquatic macroinvertebrate bioassessment and fishes bioassessment. Bald Eagle Lake is located southwest of the Project and is impaired for mercury in fish tissue and nutrient related eutrophication. These are all considered construction related parameters and require additional BMPs for construction activities within a mile of these impaired waters. 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. Groundwater elevations within the vicinity of the site are around 925 feet above sea level based on The Geologic Atlas of Washington County, Minnesota C-6, Plate 5. Topographic mapping indicates that elevations on the site range from approximately 926 to 940 feet above mean sea level. Consequently, the maximum depth to groundwater is estimated at about 15 feet. Because surficial groundwater is sometimes encountered in seasonally wet areas, the minimum depth to groundwater is estimated at 0 feet. The approximate average depth to groundwater across the site is estimated at about 6 feet. This estimate was calculated by averaging the topographic elevations on the site (931 feet) and subtracting the mapped water table elevation (925 feet). According to MN Department of Health Wellhead Protection Data, the project overlaps with two Wellhead Protection Areas: Hugo South ID # 7090 and Lino Lakes East ID #7100. In general, the project will be designed with wellhead protection in mind, by reducing overall risks to groundwater. The project will provide open spaces within the wellhead protection area. The project will also properly abandon existing wells and septic systems to further promote groundwater resource protection. No new water wells are planned for the project. The Minnesota Well Index indicates there is one registered well within the project site, Unique Well No. 674743 (Arcand, Howard domestic well). The CWI is accessed through the Minnesota Department of Health (MDH). Other Unique Well numbers identified nearby, but outside, the project area include: 413574 (Atkinson, Dean domestic well), 494957 (Peltier, Thedora domestic well), 196268 (Peltier, Kevin and Jean domestic well), 142050 (Charpentier, Bruce domestic well), 404269 (Metropolitan Steel domestic well), and 130802 (Total Packaging, Inc. domestic well). 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. 15