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WASTE DISCHARGE REQUIREMENTS -7- FORWARD INC..FORWARD LANDFILL SAN JOAQUIN CO(.11TY Waste Piles 34. Four Class H waste piles were constructed in WMU G in 1992 as biotreatment pads for petroleum contaminated soils. Each waste pile is 40 feet wide by 500 feet long. The waste piles include an outer liner of 40 mil PVC overlain by a blanket LCRS and an 18 inch-thick upper clay liner with a permeability of 10-6 cm/s or less. The clay liner is overlain by blanket LCRS and a protective soil operations laver. The liner in each waste pile has a minimum slope of one percent toward a LCRS collection pipe. The waste piles were constructed in pairs so adjacent units share a central leachate collection pipe. The two collection pipes drain to a lined sump which discharges via pipeline to the surface impoundment. CERTIFICATION 35. A certified engineering geologist certified in the October 1987 Report of Waste Discharge that WMUs C.D 87 and E meet the siting and construction requirements in Chapter 15. Design and construction certifications are provided for each additional unit or module as it is constructed. CEQA CONSIDERATIONS 36. The San Joaquin County Community Development Department adopted a final environmental ° pact report( )on the project in accordance with the California Environmental Quality Act, (Public Resources Code Section 21000,et seq.), and the State Guidelines. The project may have the following sianificant impacts on water quality: a. Surface water contamination from inadequate surface water drainage controls and stormwater detention, b. Ground water contamination from existing unlined landfill units. 37. The Board has reviewed the EIR and these WDRs will mitigate or avoid the significant impacts on water quality as follows: a. Landfill slopes, ridge tops and peripheral areas shall be revegetated upon landfill cell completion to inhibit erosion and intermittently hydroseeded during filling if erosion problems occur. b. Because WMU B is unlined and is a possible source of ground water contaminants, prohibit discharge of additional waste to WMU B until additional engineering is completed to evaluate a liner system for the landfill expansion over the top of existing WMUs. OTHER CONSIDERATIONS 38. On 9 October 1991, the United States Environmental Protection Agency (USEPA) promulgated regulations(Title 40,Code of Federal Regulations. Parts 257 and 258. "federal MSW regulations" or "Subtitle D"; that apply, in California, to dischargers who own or operate Class II or Class III landfill units at which municipal solid waste (MSWLF) is discharged.The majority of the federal MSW regulations became effective on the "Federal Deadline", which is 9 October 1993.