07/15/2004 Env Bd Packet - Laserfiche WebLink

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• estimated that approximately 0.75 acre -feet of water would run off this site during a 100 - year storm event (6 inches in 24 hours). The site will increase in impervious cover from 0 acres to 1.35 acres after full development. Through the use of the ponds and outlet structures the runoff volume after development will be approximately 0.82 acre -feet of water during a 100 year storm event. Though the overall volume may increase, the post - development runoff rate must not exceed the pre - development rate. A standard element of all development project reviews is the review of stormwater calculations to ensure that the rate does not increase. Proper construction is extremely important in ensuring the successful operation of the stormwater management plan. The overall objective for this plan is to design and implement stormwater management methods that are both effective and site - appropriate. The recommendations as outlined in Section 12 of this EAW will be incorporated in the final plans and specifications. 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. Treated stormwater will discharge to the surrounding wetlands and Wards Lake, a receiving water body that flows into George Watch Lake and Rice Creek. Impact from the runoff will be mitigated from the described stormwater management methods. 18. Water quality: wastewaters Describe sources, composition and quantities of all sanitary, municipal and industrial wastewater produced or treated at the site. Wastewater will be typical household sanitary sewer flow. No other wastewater generation or treatment will occur on site. The Metro sewer access charge (SAC) is based on 274 gallons per day per household: 2192 gallons per day for eight households. a. Describe waste treatment methods or pollution prevention efforts and give estimates of composition after treatment. Identify receiving waters, including major downstream water bodies, and estimate the discharge impact on the quality of receiving waters. If the project involves on -site sewage systems, discuss the suitability of site conditions for such systems. No on -site waste treatment is proposed. Sewage will be discharged into pipes then a lift station will pump the sewage through a force main hung from the bridge then discharged into a sanitary sewer lateral in Ruffed Grouse Road. Sewage ultimately will be treated at the Metro Wastewater Treatment Facility in St. Paul, as is all sewage from Lino Lakes. The sanitary sewer pipes within the project boundaries and the lift station will be privately owned and maintained by the homeowners' association. The lateral in Ruffed Grouse Rd. is a City facility. Environmental Assessment Worksheet Page 13 Pheasant Hills 12th Addition