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DRAFT [TENTATIVE] WASTE DISCHARGE REQUIREMENTS ORDER R5-2023-OOXX 55 <br /> FORWARD, INC. <br /> FORWARD LANDFILL <br /> SAN JOAQUIN COUNTY <br /> ATTACHMENT E—APPROVED LANDFILL LINER DESIGN <br /> 1. Single Composite Liner– from top to bottom: <br /> Component Base Side Slopes <br /> Operations Layer 12-inch thick protective cover soil 12-inch thick protective cover soil <br /> Filter Fabric Geotextile (8 oz/yd2) N/A <br /> LCRS 12-inch thick LCRS gravel Geocomposite drainage net <br /> Geotextile (12 oz/yd2) <br /> Cushion Layer (may be omitted if the LCRS gravel is N/A <br /> sub-angular to rounded) <br /> 60-mil HDPE Geomembrane 60-mil HDPE Geomembrane <br /> Composite Liner Geosynthetic clay liner (GCL) or <br /> 24-inch thick low-permeability soil 24-inch thick low-permeability <br /> (minimum permeability soil <br /> 1 x 10-7 cm/sec) (minimum permeability <br /> 1 x 10-7 cm/sec) <br /> Foundation Layer Prepared subgrade Prepared subgrade <br /> Note: The side slope liner system will be anchored in a trench located at the top of the <br /> excavation slope. <br /> 2. Surface Impoundment – from top to bottom: <br /> Component Base <br /> Primary Composite Liner 60-mil HDPE Geomembrane <br /> LCRS Geonet or Geocomposite LCRS <br /> 60-mil HDPE Geomembrane <br /> Secondary Composite Liner <br /> Geosynthetic clay liner (GCL) <br /> Foundation Layer Prepared subgrade (graded and compacted native soil) <br /> 3. Sump and Pan Lysimeter–from top to bottom: <br /> Component Base <br /> Sump Operations Layer 12-inch thick protective cover soil <br />