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hydrocarbons, such as soil staining, obvious product odor, and PID (or similar instrument) <br /> readings, will be noted in the field on the logs of bonngs <br /> Vapor Extraction Well Construction <br /> The vapor extraction well will be constructed in the boring with thread-jointed, <br /> 4-inch-inner-diameter, Schedule 40 polyvinyl chloride (PVC) casing No chemical cements, glues, <br /> or solvents will be used in well construction The screened portion of the well consist of 5 to <br /> 10 feet of factory perforated casing with 0 10-inch-wide slots The annular spaces in the wells will <br /> be packed with pea gravel to approximately 1 to 2 feet above the slotted interval A 3-foot-thick <br /> bentonite plug was added above the filter pack to prevent the cement from entering the well pack <br /> The remaining annulus was backfilled to grade with a bentonite cement slurry <br /> The well is protected with a traffic-rated, cast-alurrunum utility box equipped with a PVC skirt <br /> The box has a watertight Seal to protect against surface water infiltration and must be opened with <br /> a special wrench The design of this box discourages vandalism and reduces the possibility of <br /> accidental disturbance of the well <br /> w <br /> MON WJ"805\08051400 3DS-95 pas i A-3 Rev 0 7/23196 <br />