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1 <br /> location, depth if applicable, and date, and promptly placed in iced storage for transport <br /> to the Iaboratory Chain-of-custody records were initiated in the field by the geologist and <br /> accompanied the samples to a laboratory certified by the State of California to perform <br /> the analyses requested <br /> Vapor Extraction Well Construction <br /> The vapor extraction well was constructed in the boring with thread-pointed, <br /> 2-inch-Inner-diameter, Schedule 40 polyvinyl chloride {PVC} casing No chemical <br /> cements, glues, or solvents were used in well construction The screened portion of the <br /> wells consisted of 20 feet of factory perforated casing with 0 02-inch-wide slots The <br /> annular spaces in the wells were packed with pea gravel to approximately I to 2 feet <br /> above the slotted interval A 3-foot-thick bentonite plug was added above the sand pack <br /> to prevent the cement from entering the well pack The remaining annulus was backfilled <br /> to grade with a bentonite cement slurry <br /> The wells were protected with a traffic-rated, cast-aluminum utility box equipped with a <br /> PVC skirt The box has a watertight seal to protect against surface water Infiltration and <br /> must be opened with a special wrench The design of this box discourages vandalism and <br /> reduces the possibility of accidental disturbance of the well <br /> SACIK\2611CLOS URE-95\dms 1 B-2 Rev 0 7/18/97 <br /> 22611-100 001 <br />