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Figure 4 <br /> Ready Mixed Concrete Company <br /> Cross Section of Collection Trench <br /> Area Construction <br /> 2 feet <br /> Minimum Compacted native overburden <br /> 1-foot and clay material <br /> Geofabric material Mirafi 140N <br /> or equivalent installed on top of gravel <br /> Overburden <br /> Depth as <br /> needed to Boral #9 <br /> intercept <br /> native gravel material <br /> gravel. <br /> Excavated <br /> Trench <br /> ---------- —�-- <br /> 8-inch Perforated <br /> 50-slot rigid PVC Pipe <br /> (HDPE Pipe can be considered) <br /> Native <br /> gravel <br />