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1 <br /> Soil cuttings generated during drilling will be stored onsite on and covered with plastic <br /> sheeting. If possible, drill cuttings exhibiting subjective evidence of hydrocarbons or <br /> i producing a positive response on the PID will be separated from those drill cuttings <br /> exhibiting no subjective evidence of hydrocarbons. Four soil samples will be collected from <br /> drill cuttings and composited into one sample at the laboratory to evaluate disposal options <br /> for the soil Borings not converted to wells will be backfilled to surface with a slurry of <br /> cement, bentonite, and water <br /> Construction of Va or-Extraction Wells <br /> Vapor-extraction wells will be constructed of thread pointed, 4-inch-diameter schedule <br /> polyvinyl chloride (PVC) casing. No chemical cements, glues, or solvents will be used in <br /> well construction. The screened portion of the wells will consist of factory-perforated casing <br /> 1 with 010-inch-wide slots A maximum interval of 25 feet of slotted casings will be used <br /> Pea gravel will be placed in the annular space opposite the screen to approximately 1 foot <br /> above the top of the slotted casing A 2-foot bentonite plug will be placed above the sand <br /> pack, and a cement-bentonite slurry will be used to fill the remaining annulus to the surface <br /> A traffic-rated cast-aluminum utility box with a PVC apron will be placed over each <br /> wellhead and set in concrete flush with the surrounding concrete pad This box has a <br /> watertight seal to protect against surface water infiltration and is opened with a special <br /> wrench The design of the box discourages vandalism and reduces the possibility of <br /> e <br /> accidental disturbance of the well <br /> 1 <br /> After the appropriate local and state environmental agencies indicate that remediation of <br /> soil is no longer required, the vapor-extraction wells are removed A drill rig is used to <br /> remove the casing and gravel pack, and the bore hole is backfilled with grout composed of <br /> cement and bentonite from the bottom of the hole to surface grade. <br /> i <br /> r <br /> r <br /> r� 3soaa-7w a <br /> i Working To Restore Nature <br />