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. Air Sparge Well Construction <br /> Sparge wells are constructed to borings using thread-jointed, 314-inch inner diameter, Schedule 40 <br /> polyvinyl chloride (PVC) casing No chemical cements, glues, or solvents are used in well <br /> construction The screened portion of each well consists of factory-perforated 2-inch diameter casing <br /> with a screen size of 10-30 mu,rons Unperforated casing is installed from the top of each screen to the <br /> ground surface The annular space in the well is packed with number 2116 sand to approximately 1 to <br /> 2 feet above the slotted interval A bentonite plug is added above the sand pack to prevent cement from <br /> entering the well pack The remaining annulus is backfilled to grade with a slurry of Portland cement <br /> The sparge wells are protected with a traffic-rated steel utility box equipped with a galvanized sheet <br /> steel skirt The box has a watertight seal to protect against surface-water infiltration The design of <br /> this box discourages vandalism and reduces the possibility of accidental disturbance of the well <br />