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WASTE DISCHARGE RE MENTS ORDER NO. -9- FORWARD INC. AND ALLIED WASTE INDUSTRIES FOR OPERATION OF FORWARD CLASS II LANDFILL SAN JOAQUIN COUNTY continues to be an adequate minimum standard"however, the Board"should require a more stringent design in a case where it determines that the minimum design will not provide adequate protection to a given body of groundwater." 41. In a letter dated 17 April 2001, the Executive Officer notified Owners and Operators of Solid Waste Landfills that"the Board will require a demonstration that any proposed landfill liner system to be constructed after 1 January 2002 will comply with Title 27 performance standards. A thorough evaluation of site-specific factors and cost/benefit analysis of single, double and triple composite liners will likely be necessary. 42. On 21 February 2002, the Discharger submitted "Leachate Attenuation Analyses Prescriptive Clay Liner, Forward Landfill", and on 21 March staff provided comments for that document. On 10 July 2002 the discharger submitted "Performance Demonstration for a Single Composite Liner", and on 14 August 2002 staff provided comments for that document. On 25 September 2002 the discharger submitted a revised performance demonstration and on 24 October 2002 staff responded indicating concurrence with the revised demonstration. The proposed liner system consists of a single composite base liner from bottom to top composed of. a prepared subgrade, two feet of compacted clay, 60 mil HDPE, one-foot gravel drainage layer, filter fabric, one-foot operations layer, and a first waste layer composed of selected waste. Sideslope liners to be composed of. a prepared subgrade, two-feet of compacted clay or GCL, 60 mil HDPE, geocomposite drainage net, and one-foot operations layer. Forward proposes to install a double composite liner under landfill sumps, conduct an electric leak test over the sump, conduct CQA inspections during placement of the operations layer and first lift of refuse, conduct an electric leak test over the entire base liner after installation of the operations layer; and use selected material in the operations layer. The report demonstrated that the proposed liner system would effectively prevent the migration of wastes from the unit. CONSTRUCTION AND ENGINEERED ALTERNATIVE 43. 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). 44. Resolution No. 93-62 requires the construction of a specified composite liner system at new municipal solid waste landfills, or expansion areas of existing municipal solid waste landfills, that receive wastes after 9 October 1993. 45. Resolution No. 93-62 also allows the Board to consider the approval of engineered alternatives to the prescriptive standard. Section III.A.b. of Resolution No. 93-62 requires