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DRAFT [TENTATIVE] WASTE DISCHARGE REQUIREMENTS ORDER R5-2023-00XX 62 <br />FORWARD, INC. <br />FORWARD LANDFILL <br />SAN JOAQUIN COUNTY <br />4.Intermediate Liner – from top to bottom: <br />Sump Filter Fabric Geotextile separator (8 oz/yd2) <br />Sump LCRS Gravel filled LCRS sump with access pipe <br />Sump Composite Liner 60-mil HDPE Geomembrane <br />Geosynthetic clay liner (GCL) <br />Sump Foundation Layer 6-inch compacted soil <br />Pan Lysimeter Gravel filled pan lysimeter with access pipe <br />Composite Liner <br />60-mil HDPE Geomembrane <br />Geosynthetic clay liner (GCL) or 24-inch thick low- <br />permeability soil (minimum permeability <br />1 x 10-7 cm/sec) <br />Foundation Layer Prepared subgrade (graded and compacted native soil) <br />Note: Pan lysimeters installed beneath the LCRS sump in each new landfill cell/module for <br />the purpose of vadose zone monitoring. <br />Component Base <br />Operations Layer 12-inch thick protective cover soil <br />Cushion Layer Geocomposite drainage net <br />Composite Liner <br />60-mil HDPE Geomembrane <br />24-inch thick low-permeability soil <br />(minimum permeability 1 x 10-7 cm/sec) or geosynthetic clay <br />liner (GCL) <br />Foundation Layer Min 12-inch foundation soil <br />12-inch existing soil cover <br />Note: Intermediate liner system were constructed to separate Class III waste in unlined or <br />non-Subtitle D lined existing WMUs from adjacent Class II WMUs. Intermediate liner <br />systems were utilized for WMU ART-03, WMU FU-04 North, WMU FU-05 North, WMU FU- <br />06 North, WMU FU-08 North, WMU FU-10, WMU FU-13, and WMU FU-17.