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November 7, 1986 AGS 8691-3 <br /> Beacon Service Station #1-502 - Lodi, California <br /> MONITORING WELL CONSTRUCTION/DEVELOPMENT <br /> The ground water monitoring wells MW-1 through MW-3 were <br /> constructed with four-inch inner diameter schedule 40 threaded <br /> PVC casing. No chemical cements or solvents were used in well <br /> construction. The screened portion of each well consists of <br /> thirty feet of 0.020-inch machine-slotted PVC screen. The base <br /> of each well was plugged with a threaded PVC plug. The well <br /> screen extends from total depth of each well to ten feet above <br /> the upper zone of saturation, allowing for seasonal fluctuation <br /> of ground water. The annular space was packed with sorted sand <br /> to approximately two feet above the perforations. A one to two <br /> foot thick bentonite plug was placed above the sand to prevent <br /> cement from entering the sand pack. The remaining annulus was <br /> backfilled with neat cement to grade. Details of construction of <br /> individual wells are graphically illustrated on the Boring Logs. <br /> A CNI utility box was placed over the well head of each of the <br /> monitoring wells and cemented into place flush with the <br /> surrounding station pad. These utility boxes have a water tight <br /> seal to protect against surface water infiltration and require a <br /> specially designed spanner wrench to open. This reduces the <br /> possibility of well vandalism or accidental disturbance. <br /> 5 <br /> APP ed GeoSyStemS <br />