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WASTE DISCHARGE REQUIREMENTS ORDER NO.R5-2002-0219 -16- <br /> FOR COUNTY OF SAN JOAQUIN <br /> FOR CONSTRUCTION AND OPERATION OF NORTH COUNTY RECYCLING <br /> CENTER AND SANITARY LANDFILL FACILITY, <br /> SAN JOAQUIN COUNTY <br /> 5) 0.75-foot-thick gravel drainage layer on base areas with a hydraulic conductivity <br /> greater than 0.1 cm/sec. <br /> 6) A filter geotextile. <br /> c. The side slope liner shall be comprised, in ascending order, of the following: <br /> 1) A prepared subgrade that meets the criteria contained in Construction <br /> Specification D.4,below. <br /> 2) A GCL barrier that shall exhibit appropriate strength characteristics to <br /> accommodate stresses associated with specific landfill design parameters, with <br /> particular attention to interface, long-term creep shear, and bearing capacity. <br /> 3) A 60-mil thick synthetic flexible primary membrane of HDPE. <br /> 4) A geocomposite drainage layer. <br /> 5) A filter geotextile. <br /> 6) A two-foot thick soil operations layer. <br /> 3. The Discharger may propose changes to the liner system design prior to construction, <br /> provided that approved components are not eliminated, the engineering properties of the <br /> components are not substantially reduced, and the proposed liner system results in the <br /> protection of water quality equal to or greater than the design prescribed by Title 27 and <br /> this Order. The proposed changes may be made following approval by the <br /> Executive Officer. Substantive changes to the design require reevaluation as an <br /> engineered alternative and approval by the Board. <br /> 4. If the Discharger proposes to construct a liner system in which a GCL is placed on top <br /> of a subgrade,the subgrade for the bottom and the side slopes of the Unit shall be <br /> prepared in an appropriate manner using accepted engineering and construction methods <br /> so as to provide a smooth surface that is free from rocks, sticks, or other debris that <br /> could damage or otherwise limit the performance of the GCL. <br /> 5. Construction shall proceed only after all applicable construction quality assurance plans <br /> have been approved by Executive Officer. <br /> 6. Following the completion of construction of a Unit or portion of a Unit, and prior to <br /> discharge onto the newly constructed liner system,the final documentation required in <br /> §20324(d)(1)(C)of Title 27 shall be submitted to the Executive Officer for review and <br />