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WASTE DISCHARGE QUIREMENTS ORDER NO. -5- FORWARD INC. FOR CLOSURE OF FRENCH CAMP MUNICIPAL SOLID WASTE LANDFILL SAN JOAQUIN COUNTY occurring waste constituent detected above its practical quantitation limit(PQL), indicates that a release of waste from a Unit has occurred. Following an indication of a release, verification testing will be conducted to determine whether there has been a release from the Unit, or there is a source of the detected constituents other than the landfill, or the detection was a false detection. Although the detection of one non-naturally occurring waste constituent above its MDL is sufficient to provide for the earliest possible detection of a release, the detection of two non-naturally occurring waste constituents above the MDL as a trigger is appropriate due to the higher risk of false-positive analytical results and the corresponding increase in sampling and analytical expenses from the use of one non-naturally occurring waste constituent above its MDL as a trigger. GROUNDWATER DEGRADATION 31. Downgradient groundwater contains elevated concentrations of Total Dissolved Solids (TDS) Chloride, Sulfate and Nitrate. Groundwater samples commonly detect intermittent low level concentrations of Volatile Organic Compounds (VOCs) often in both background and compliance monitoring wells. CONSTRUCTION AND ENGINEERED ALTERNATIVE 32. The landfill cover shall consists of minimum two feet of soil foundation layer,minimum one foot clay low-permeability layer with a permeability less than 1 X 10-6 cm/sec, and minimum one foot vegetative soil layer. 33. Prior to installation of the final cover, the landfill surface will be re-graded. The top deck will have minimum three percent slopes, the side slopes will have maximum 2.5:1 slopes. To achieve the design slopes some waste will be moved. 34. For most of the facility, the lower landfill sideslope is either the French Camp Slough or Walker Slough levee. The final landfill cover will tie to the existing levee. 35. Surface water runoff from the top deck will drain to grass lined swales along the top deck perimeter, the collected storm water will drain to either a sediment basin at the south east comer of the site or via down drains to Walker Slough. Erosion control matting will be used in the drainage swales and at drainage outlets to minimize erosion. The storm water drainage system is designed for flows from a 100-year, 24-hour storm event. 36. On 17 June 1993, the State Water Resources Control Board adopted Resolution No. 93-62 implementing a State Policy for the construction,monitoring, and operation of municipal solid waste landfills that is consistent with the federal municipal solid waste regulations promulgated under Title 40, Code of Federal Regulations,Part 258 (Subtitle D).