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The 2-inch-diameter polyvinyl chloride well casing consisted of 0.020-inch slotted casing from <br /> the bottom of the boring to a depth interval above the highest anticipated water level, and <br /> solid casing was installed from the top of the slotted casing to approximately 0.5 foot below <br /> grade to accommodate the utility box. The casings, fittings, screens, and other well <br /> construction components were steam cleaned before installation. <br /> The annular space surrounding the screened portion was backfilled with No. 3 Lonestar sand <br /> (filter pack) to approximately 2 feet above the top of the screened section. An approximately <br /> 1-foot-thick interval of bentonite pellets was added to the annulus above the filter pack and <br /> hydrated with approximately 5 gallons of deionized water to minimize intrusion of well seal <br /> into the filter pack. The remaining annulus was sealed with a neat cement grout to the <br /> surface. A traffic-rated utility box was installed around the top of the well casing and set in <br /> concrete. An expanding, watertight well cap and lock were installed on top of the well <br /> casing to secure the well from surface fluid and tampering. <br /> i <br />