12/03/2003 Env Bd Packet - Laserfiche WebLink

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a water quality technical memorandum that outlines the ability of the site plan to provide adequate retention and infiltration of surface water runoff. Based on the water quality analysis, the proposed development has maintained adequate area for the retention (ponds) and infiltration (natural and underground chambers) of surface water runoff. Before construction can proceed, both the City of Lino Lakes and Rice Creek Watershed District must issue permits to satisfy surface water management regulations. The project will eliminate two existing infiltration basins along the north side of Town Center Parkway. These basins will be replaced elsewhere on the site. b. Identify routes and receiving water bodies for runoff from the site; include major downstream water bodies as well as the immediate receiving waters. Estimate impact runoff on the quality of receiving waters. Runoff from the site currently drains to the south and east and ultimately discharges to Marshan Lake and George Watch Lake. Following development of the proposed site, storm water will be treated through infiltration in open spaces or subsurface chamber technology and through retention ponds that will meet National Urban Runoff Program (NURP) guidelines, City of Lino Lakes policies /criteria, and Rice Creek Watershed District rules and regulations. Storm water rate control and treatment will occur prior to any storm water being discharged to receiving water bodies (See Figure 7). Therefore, water quality in the receiving waterbodies will not be adversely effected. Treated storm water will either be naturally infiltrated into the groundwater or will be discharged to existing wetland basins located on and/or adjacent to the site. Water from these wetlands eventually will enter George Watch Lake, Marshan Lake, and the remainder or the Rice Creek Chain of Lakes system. 18. Water quality: wastewaters a. Describe sources, composition and quantities of all sanitary, municipal and industrial wastewater produced or treated at the site. Normal domestic wastewater /sewage will be generated from the site. Some commercial developments may result in flows of waste associated with restaurants or other eatery type uses. Estimated sewer flows are based upon the wastewater flow rates of 100 gallons per day per person (residential) and 40 gallons per day per employee (commercial). The projected sewer flows will be approximately 120,000 gallons per day (average) or 470,000 gallons per day (peak). Legacy at Woods Edge Development EAW DRAFT Lino Lakes, MN 17