06/11/2007 Council Packet - Laserfiche WebLink

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system with a City -owned lift station, and a grinder pump system where each home is serviced by a small lift pump that discharges to a shared forcemain. 3. Conventional Sewer /Lift Station System a) A standard duplex lift station would be constructed near Shadow Court. An 8 -inch gravity sanitary sewer would be extended from there north and south to serve the residential and commercial property on the northern section of the road. Because of the length of the Project, and the flat grades, the lift station will be approximately 25 feet deep. Sewer depths will range from 10 to 20 feet below grade. High groundwater will make construction difficult, as extensive dewatering will be needed. With a sewer this deep, the entire right -of -way will be needed to contain the excavation. In many areas, soil will need to be removed from the excavation area, stockpiled, and hauled back. This process will be slow and very disruptive for the residents. b) The forcemain would be extended around the north end of the lake to Black Duck Drive. It is not recommended to extend it southward across the channel due to unstable soils. c) Each buildable lot would have a 4 -inch gravity sanitary sewer service. d) When the homeowners are ready to connect, they would be responsible for abandoning the existing septic system and extending the service into their home. Grinder Pump /Common Forcemain System In many areas where septic systems are being replaced and high groundwater is a significant cost factor, communities will have individual property owners install grinder pumps. These grinder pumps will then all discharge into a common forcemain. For this Project we would recommend constructing a 3 -inch HDPE forcemain with a discharge at Black Duck Drive. Each buildable lot would have a 1 -1/2 inch service stub for their pump to connect to. Page 8 13849.005