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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2003-0049 -17- FORWARD INC. AND ALLIED WASTE INDUSTRIES FOR OPERATION OF FORWARD CLASS II LANDFILL SAN JOAQUIN COUNTY c. An unsaturated zone monitoring system, consisting of a pan lysimeter shall be installed beneath the unit leachate sump. 2. The bottom liner of all new Units and lateral expansion areas of existing Units shall be constructed in accordance with the following composite liner designs: 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. The side slope liner of all new Units and later expansion areas of existing Units shall be constructed in accordance with the following composite liner design: 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. 3. 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. 4. 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. 5. Construction shall proceed only after all applicable construction quality assurance plans have been approved by Executive Officer. 6. 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 engineering geologist. It shall contain sufficient information and test results to verify that construction was in accordance with the design plans and specifications, and with the prescriptive standards and performance goals of Title 27. Testing shall include a liner leak detection test conducted after installation of the drainage layer and the operations layer.