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Actual leachate generation data compiled over a 12-year period from the Forward Landfill and <br /> information from the Design Report for the existing leachate surface impoundment WMU F-North <br /> entitled Waste Man cement Unit D-99 Class II Leachate Impoundment and Closure of Eastern Ash <br /> Pit WMU Interim F Forward Inc. Landfill (CHzM Hill. 1999) report were used to perform <br /> calculations to evaluate site leachate generation and storage volume requirements for the Austin Road <br /> site within Forward Landfill. <br /> After construction of the WMU F-West leachate surface impoundment, the site available leachate <br /> storage capacity will be as follows: <br /> Surface 3mgoiandent Basrn 2 foot`It'reell©ard TO <br /> WMU F-North 3,478,200 gallons 785,400 gallons 4,263,600 gallons <br /> WMU F-West 2,703,945 gallons 53 1,100 gallons 3,235,045 gallons <br /> Total 6,182,145 gallons 1,316,500 gallons 7,498,645 gallons <br /> If during the service life of the landfill, the demand on the leachate impoundments exceed capacity, <br /> Forward, Inc. will implement an alternative leachage management plan. The leachate impoundments <br /> are intended to serve as the primary mechanism for disposal of collected leachate. However, the <br /> impoundments may be supplemented by other disposal methods during peak years of operation, if <br /> necessary. Leachate in excess of WMU F-North and WMU F-West impoundment's capacity will <br /> either be pumped to temporary on-site tanks or trucked for off-site disposal at the City of Stockton <br /> Municipal Utility District waste water treatment plant located at 2500 North Nave Drive in Stockton. <br /> Leachate stored in the temporary on-site tanks may be released back into the impoundment at a later <br /> date. <br /> Specifications for HDPE, GCL, slurry cement, coarse gravel, and geotextile and geocompostie <br /> drainage layers are included in Appendix B. Quality Assurance testing of liner materials is outlined <br /> in the CQA Manual (Appendix D). The CQA testing includes all normal testing for HDPE, <br /> geotextile and HDPE material properties. Details of the leachate impoundment components are <br /> shown on the Construction Drawings in Appendix A. <br /> FORWARD LANDFILL WMU F-03 AND F-WEST DESIGN REPORT <br /> 5-6 <br />