2007-11-28 CC Packet - Laserfiche WebLink

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12. Water Quality - Wastewaters. Sanitary sewer wastewater will be produced from a few sources. The first would be municipal wastewater from the townhomes and condos. This waste will be typical of any residential development. The second would be municipal wastewater from retail and office space as proposed on the first floor of some of the downtown buildings. Again, this wastewater will be typical of any office building. The third source would be from any restaurant that may occupy some of the available retail space. Their wastewater may be higher in organic composition including fats and oils. Estimated quantities are listed below: Residential 65,000 gallons per day (gpd) (average) Office/Retail 11,000 gpd (average) Restaurants 44,000 gpd (average) Total = 120,000 gpd (average) All wastewater produced by the proposed redevelopment project will be treated at the Metropolitan Council's Metro Wastewater Treatment Facility. The Minnesota Pollution Control Agency (MPCA) and Metropolitan Council Environmental Services (MCES) will issue permits assuring that their facilities are able to handle the wastewater. The EAW comment letter received from the Metropolitan Council confirms that the Metropolitan Disposal System facilities serving the redevelopment site have adequate capacity for the proposed flow. Restaurants may be required to install grease traps or other such pretreatment devices on their wastewater discharge lines to prevent maintenance issues in City owned sanitary sewer pipes and lift stations. 13. Geologic Hazards and Soil Conditions. A Minnesota Geological Survey publication (Geologic Atlas Washington County, Minnesota) and County soils information were reviewed for the project site. The Geologic Atlas indicated that the depth to groundwater is a minimum of 96 feet below grade with an average of 170 feet below grade. The atlas indicated the depth to bedrock is a minimum of 50 feet below grade with an average depth of 100-200 feet below grade. However, during the completion of soil borings at the site, it was discovered that in some areas the depth to bedrock is more shallow, approximately 20 feet below grade. -, Well records found in the County Well Index database indicate the minimum and average depths to groundwater in the redevelopment area are 5 feet below grade (bg) and 15 feet bg, respectively. The well records indicate the minimum and average depths to bedrock are 60 feet bg and 80 feet bg, respectively. Geology According to the Surficial Geology Map of the Anoka 30x60 Quadrangle (Meyer and Patterson, Minnesota Geological Survey, 1999), the project site lies primarily in an area overlain by loamy till, chiefly comprised of loamy textured soil with unsorted sediments, pebbles, cobbles, or boulders. A symbol on the surficial geology map indicates the site has been intersected in the past by deep, broad troughs cut by meltwaters of the Superior lobe glacier. These features are evidenced by local chains of lakes, including Centerville Lake and Peltier Lake. Centerville Downtown Redevelopment Page 24