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' 74ww 4 <br /> Schematic Vapor Extraction Wells <br /> N <br /> Ground Surface <br /> ' To Blower <br /> ' Well Box <br /> 1 <br /> Cement Grout <br /> ' from bentonite sea[ to surface) <br /> Vadose Zone Well Casing <br /> (4" Sch. 40 PVC) <br /> 1 <br /> ' Bentonite Annular Seal <br /> (2' high) <br /> 7, Sew"at 25' <br /> Ground Water Level <br /> , <br /> 1 <br /> 1 <br /> #3 Sand Filter pack <br /> (extends 2' over screen) <br /> ' lotted Casing (.020 slots) <br /> Aquifer <br /> Borehole, 8" or 10" <br /> = End Cap @ 55' <br /> I <br />