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TELESCOPING OR <br /> HINGED COVER <br /> KEY PADLOCK 0.3' MAX. <br /> OVERSIZED CAP OR —PROTECTIVE CASING <br /> UNDERSIZED PLUG <br /> '/�' DIA. DRAINAGE PORT <br /> 4 <br /> COARSE GRAVEL BLANKET <br /> 3 <br /> GROUND SURFACE <br /> INTERNAL MORTAR COLLAR <br /> GROUT 5'_ <br /> CENTRALIZER <br /> COUPLING <br /> 5' MIN. FOR PELLETS <br /> BENTONITE SEAL OR 5' MAX. FOR SLURRY <br /> 5' MIN. <br /> WELL SCREEN <br /> FILTER PACK <br /> CAP OR PLUG <br /> S' MAX. <br /> REMEDIAL INVESTIGATION/ <br /> Figure 4.2.2.1 FEASIBILITY STUDY <br /> TYPICAL WELL CONSTRUCTION Sharpe Army Depot <br /> Lathrop, California <br /> U.S. Army <br /> Toxic and Hazardous Materials Agency <br /> SOURCE ESF_ M& Aberdeen Proving Ground, Maryland <br /> 4-13 <br />