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each sump will pump leachate into a force main located outside the lined landfill <br />area. The force main will discharge to lined surface impoundments in which the <br />leachate will evaporate. <br />Three leachate evaporation impoundments are ultimately planned for the site. <br />WMU F North is located in the southwest region of the existing Forward Landfill <br />site, just north of the South Branch. It was constructed in 1999 and currently <br />provides containment for leachate from the active portions of the existing Forward <br />Landfill. A second Class II leachate impoundment, WMU F South is planned to be <br />constructed in the southwest region of the existing Forward Landfill, south of the <br />South Branch to service the final disposal.,ar,ea for..th,e..site. A third Class II leachate <br />impoundment is planned to be constructed outside the southwest edge of the <br />existing Austin Road Landfill to service future refuse disposal within the Austin <br />Road Landfill expansion areas. <br />WMU F North is a double lined unit and contains a geosynthet4c clay,liner (GCL) <br />overlain by a 60 -mil HDPE geomembrane, a geonet, and an additional 60 -mil <br />HDPE geomembrane. The leachate impoundment was sized"based on actual <br />leachate generation records from 1991 to 1997 and has a design capacity of <br />approximately 3.5 million gallons. <br />If during the service life of the landfill, the demand on the leachate <br />impoundments exceed capacity, Forward 'will implement an"alternative"leachate <br />management plan. The leachate impoundments are intended to serve as a <br />primary mechanism for disposal of collected leachate. However, the <br />impoundment may be supplemented by other, disposal methods during peak <br />years of operation, if necessary. Leachate in excess of the impoundment's <br />capacity will either be pumped to temporary onsite tanks or trucked for off-site <br />disposal at the City of Stockton Municipal Utility District wastewater treatment <br />plant located at 2500 North Navy Drive in Stockton. Leachate stored in the <br />temporary on-site tanks may be released back into the impoundments at a later <br />date. <br />Forward Landfill PCPCMP 2-6 <br />L•\Allied\2000.193\Reports\FinaIPCPCMP:FL-sec2:8/22/01 BRYAN A. STIRRAT S ASSOCIATSt <br />