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WASTE DISCHARGE REQUI EMENTSORDERNO. R5-2003-0020 -13- FOR COUNTY OF SAN JOAQUIN FOR CONSTRUCTION, OPERATION, CLOSURE AND EVALUATION MONITORING FOOTHILL SANITARY LANDFILL, MUNICIPAL SANITARY LANDFILL SAN JOAQUIN COUNTY 7. The Discharger shall maintain a Storm Water Pollution Prevention Plan and Monitoring Program and Reporting Requirements in accordance with State Water Resources Control Board Order No. 97-03-DWQ, or retain all storm water on-site. 8. Soil cover shall be provided and maintained, in addition to intermediate cover, on surfaces that have reached final elevations or which are not at final elevations but which will not receive refuse within two years. Surfaces shall be maintained with the following soil cover thickness: Slopes 5:1 and less: a total 3 feet of compacted soil. Slopes steeper than 5:1: a total 2 feet of compacted soil. Soil thickness shall be after compaction to 85% relative density. 9. Interim and partial cover over wastes discharged to a landfill shall be designed and constructed to minimize percolation of liquids through the wastes. 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 construction of new modules within 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 area soils, evaluating their use as the base layer; and c. An unsaturated zone monitoring system, which is demonstrated to remain effective throughout the active life, closure, and postclosure maintenance periods of the Unit, which shall be installed beneath the composite liner system in accordance with §20415(d) of Title 27. 2. Both the bottom liner and side slope liner of all new Units and lateral expansion areas of existing Units shall be constructed in accordance with one of the following composite liner designs: a. The prescriptive standard design which consists of a lower compacted soil layer that is a minimum of two feet thick with a hydraulic conductivity of 1 x 10 cm/sec or less and has a minimum relative compaction of 90%. Immediately above the compacted soil layer, and in direct and uniform contact with the soil layer, shall be a synthetic flexible membrane component that shall be at least 40 -mil thick (or at least 60 -mil thick if composed of high density polyethylene [HDPE]), which is immediately