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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2003-0049 -17- FORWARD INC. AND ALLIED WASTE INDUSTRIES FOR OPERATION OF FORWARD CLASS H LANDFILL SAN JOAQUIN COUNTY D. CONSTRUCTION SPECIFICATIONS 1. The Discharger shall submit for Executive Officer review and approval prior to construction, design plans and specifications for new Units and expansions of existing Units,that include the following: a. A Construction Quality Assurance Plan meeting the requirements of§20324 of Title 27; and b. A geotechnical evaluation of the soils proposed for use in construction of the low hydraulic conductivity layer; and 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.