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WASTE DISCHARGE REQUIREMENTSORDER NO. R5-2003-0020 -15- FOR COUNTY OF SAN JOAQUIN FOR CONSTRUCTION, OPERATION, CLOSURE AND EVALUATION MONITORING FOOTHILL SANITARY LANDFILL, MUNICIPAL SANITARY LANDFILL SAN JOAQUIN COUNTY 5) 0.75 -foot -thick gravel drainage layer on base areas with a hydraulic conductivity greater than 0.1 cm/sec. 6) A filter geotextile. C. The side slope liner shall be comprised, in ascending order, of the following: 1) A prepared subgrade that meets the criteria contained in Construction Specification D.5, below. 2) A GCL barrier that shall exhibit appropriate strength characteristics to accommodate stresses associated with specific landfill design parameters, with particular attention to interface, long-term creep shear, and bearing capacity. 3) A 60 -mil thick synthetic flexible primary membrane of HDPE. 4) A geocomposite drainage layer. 5) A filter geotextile. 6) A two -foot thick soil operations layer. 4. The Discharger may propose changes to the liner system design prior to construction, provided that approved components are not eliminated, the engineering properties of the components are not substantially reduced, and the proposed liner system results in the protection of water quality equal to or greater than the design prescribed by Title 27 and this Order. The proposed changes may be made following approval by the Executive Officer. Substantive changes to the design require reevaluation as an engineered alternative and approval by the Board. 5. If the Discharger proposes to construct a liner system in which a GCL is placed on top of a subgrade, the subgrade for the bottom and the side slopes of the Unit shall be prepared in an appropriate manner using accepted engineering and construction methods so as to provide a smooth surface that is free from rocks, sticks, or other debris that could damage or otherwise limit the performance of the GCL. 6. Construction shall proceed only after all applicable construction quality assurance plans have been approved by Executive Officer. 7. Following the completion of construction of a Unit or portion of a Unit, and prior to discharge onto the newly constructed liner system, the final documentation required in §20324(d)(1)(C) of Title 27 shall be submitted to the Executive Officer for review and approval. The report shall be certified by a registered civil engineer or a certified