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DRAFT [TENTATIVE] WASTE DISCHARGE REQUIREMENTS ORDER R5-2023-00XX 61 <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 />2.Surface Impoundment – from top to bottom: <br />3.Sump and Pan Lysimeter – 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 />Cushion Layer <br />Geotextile (12 oz/yd2) <br />(may be omitted if the LCRS gravel is <br />sub-angular to rounded) <br />N/A <br />Composite Liner <br />60-mil HDPE Geomembrane 60-mil HDPE Geomembrane <br />24-inch thick low-permeability soil <br />(minimum permeability <br />1 x 10-7 cm/sec) <br />Geosynthetic clay liner (GCL) or <br />24-inch thick low-permeability <br />soil <br />(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 />Component Base <br />Primary Composite Liner 60-mil HDPE Geomembrane <br />LCRS Geonet or Geocomposite LCRS <br />Secondary Composite Liner <br />60-mil HDPE Geomembrane <br />Geosynthetic clay liner (GCL) <br />Foundation Layer Prepared subgrade (graded and compacted native soil) <br />Component Base <br />Sump Operations Layer 12-inch thick protective cover soil