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WASTE DISCHARGE REQUIREMENTS ORDER NO.R5-2002-0219 -9- FOR COUNTY OF SAN JOAQUIN FOR CONSTRUCTION AND OPERATION OF NORTH COUNTY RECYCLING CENTER AND SANITARY LANDFILL FACILITY, SAN JOAQUIN COUNTY 48. Section 20080(b) of Title 27 allows the Board to consider the approval of an engineered alternative to the prescriptive standard. In order to approve an engineered alternative in accordance with §20080(c)(1) and(2), the Discharger must demonstrate that the prescriptive design is unreasonably and unnecessarily burdensome and will cost substantially more than an alternative which will meet the criteria contained in §20080(b), or would be impractical and would not promote attainment of applicable performance standards. The Discharger must also demonstrate that the proposed engineered alternative liner system is consistent with the performance goal addressed by the particular prescriptive standard, and provides protection against water quality impairment equivalent to the prescriptive standard in accordance with §20080(b)(2) of Title 27. 49. 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. 50. The Discharger proposes a liner system which will be designed,constructed, and operated so as to be capable of preventing degradation of the waters of the state as a result of waste discharges to the landfill,including operations, closure and postclosure maintenance period in accordance with the criteria set forth in Title 27 for a Class III landfill, and the provisions in State Water Resources Control Board Resolution No. 93-62 for municipal solid wastes. 51. The Discharger submitted a Report of Waste Discharge requesting approval of an engineered alternative to the prescriptive liner requirements. 52. The engineered alternative proposed by the Discharger for the botxom liner system of Module 4 and future modules consists of(from top to bottom): a 2-foot-thick soil operations layer; an 8 oz./sy. nonwoven geotextile separator/filter; a 0.75-foot-thick gravel drainage layer; leachate collection troughs with 4-inch-diameter piping; a 60-mil HDPE geomembrane; a geosynthetic clay liner(GCL), and a twelve inch thick prepared subgrade. 53. Side slope liner systems are proposed to be constructed of(from top to bottom) a 2-foot- thick soil operations layer; a geocomposite drainage layer with a nonwoven geotextile separator/filter; a 60-mil HDPE geomembrane; a GCL; and a prepared subgrade. The subgrade will be prepared in an appropriate manner using accepted engineering and construction methods so as to provide a surface that is smooth and free from rocks, sticks, and other debris that could damage or otherwise limit the performance of the geosynthetic clay layer and/or geomembrane, and certified in accordance with this Order and the approved CQA Plan.