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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2010-0016 -26- SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS NORTH COUNTY LANDFILL SAN JOAQUIN COUNTY <br /> <br /> LCRS ¾-foot gravel drain layer <br />60-mil HDPE3 Base Liner GCL4 Foundation Layer ≥ 1’ compacted subgrade ≥ 1/2’ ____________________________ 1. 8 oz/yd2 non-woven fabric. 2. Consists of geonet with overlying and underlying filter fabric. 3. Textured on both sides. 4. Shall exhibit appropriate strength characteristics (hydrated) to accommodate stresses associated with specific landfill design parameters, with particular attention to interface, long-term creep, shear, and bearing capacity. 2. Lateral expansions of the existing Unit (i.e., new modules) shall be constructed in accordance with the following LCRS design: <br />a. Foundation layer - graded at 2.2% cross slope toward collection sump. <br />b. Blanket layer – <br />1) ≥ ¾-foot thick layer of rounded gravel over base liner <br />2) Geocomposite (or equivalent combination of geonet and filter fabric) over slide slopes. <br />c. French drain – perforated HDPE pipes installed in gravel filled troughs above the base liner, including the following: <br />1) 4-inch diameter laterals installed at 1% minimum slope. Laterals shall be equipped pipe risers at each end for inspection and cleaning, if necessary, and a wire rope to enable video camera inspection of the lines. 2) 6-inch diameter header pipe at a minimum 2% slope. <br />d. Collection Sump – The collection sump shall be constructed as follows, from top to bottom: <br />Component Specification Gravel Sump gravel Volume Tank1 <br />Pump Automatic with high and low alarms, flow meter Filter Fabric Geotextile2 Primary Composite Liner 60-mil HDPE/GCL Secondary LCRS3 Geonet