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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2003-0049 -10- FORWARD INC. AND ALLIED WASTE INDUSTRIES FOR OPERATION OF FORWARD CLASS II LANDFILL SAN JOAQUIN COUNTY 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 that the engineered alternative liner systems be of a composite design similar to the prescriptive standard. 46. Section 13360(a)(1) of the California Water Code allows the Board to specify the design, type of construction, and/or particular manner in which compliance must be met in waste discharge requirements or orders for the discharge of waste at solid waste disposal facilities. 47. The Discharger proposes a liner system which will be designed, constructed, and operated to prevent migration of wastes from the Unit to adjacent natural geologic materials, groundwater, or surface water during disposal operations, closure, and the post-closure maintenance period in accordance with the criteria set forth in Title 27 for a Class II landfill, and the provisions in State Water Resources Control Board Resolution No. 93-62 for municipal solid wastes. 48. The Discharger submitted a Report of Waste Discharge and a Liner Performance Demonstration requesting approval of a single composite liner. 49. The single composite liner design proposed by the Discharger for the bottom liner of the Unit consists of, in ascending order: a prepared subgrade; a 24-inch thick, low-permeability soil layer(minimum permeability of 1 X 10-7 cm/sec); a 60-mil high density polyethylene (HDPE)geomembrane; a 12-ounce/square yard cushion geotextile (may be omitted if the LCRS gravel is sub-angular to rounded); a 12-inch LCRS gravel drainage layer; an 8- ounce/square yard separator geotextile; and a 12-inch thick protective cover soil operations layer. 50. The single composite liner design proposed by the Discharger for the side slope liner is to be constructed of, in ascending order: a prepared subgrade; a GCL or a 24-inch thick low permeability soil layer(minimum permeability of the soil 1 X 10"7 cm/sec); a geocomposite drainage net; and a 12-inch thick protective cover soil operations layer. 51. The Discharger adequately demonstrated that construction of a Subtitle D prescriptive standard liner on the side slopes would be unreasonable and unnecessarily burdensome when compared to the proposed engineered alternative design. The installation of 24-inches of compacted low permeability soil and gravel drainage material on side slopes will be technically difficult and would cost substantially more than the use of GCL and geocomposite drainage net respectively(the alternative design). The Discharger has demonstrated that the proposed engineered alternative is consistent with the performance goals of the prescriptive standard and affords equivalent protection against water quality impairment.