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Ah <br /> Dual-Phase Extraction Well Construction Diagram <br /> DPE1 - DPE11 <br /> Ground surface f- — Raised well cover 0.25 inches <br /> Traffic-rated well box <br /> Minimum 3"casing protrusion capped with lock <br /> 1' Surface concrete seal <br /> Annular seal <br /> (Bentonite cement slurry) <br /> 3' <br /> 2" Schedule 40 PVC casing <br /> 6' <br /> 6" Minimum diameter borehole <br /> 10' Current Groundwater level <br /> 0.02-inch Slot size screening <br /> on Schedule 40 PVC <br /> Sand pack (No. 3 sand) <br /> 20' <br /> Figure 2: Dual-Phase <br /> Extraction Well Construction <br /> Frontier Transportation <br /> 425 West Larch Road <br /> Tracy, California 95304 <br /> DRAWN BY: DATE: PROJECT <br /> GI Aril 2011 Frontier`rrans. 01 <br /> t Ami Adini <br /> ♦lam & Associates, Inc. <br />