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F <br /> ntamination January 3, 1989 <br /> rvice Station, Manteca, California AGS 38053-1 <br /> feet above the top of the screen. A bentonite <br /> feet thick, was placed above the sand to prevent <br /> cement from entering the sand pack. The remaining annulus was <br /> backfilled with a slurry of water, cement, and bentonite to a few <br /> inches below the top of the casings. The construction details of <br /> the individual wells are graphically illustrated on the boring <br /> logs. <br /> The well heads were secured in cast-aluminum utility boxes with <br /> PVC aprons. The boxes were set in concrete approximately <br /> 1/2-inch above the surrounding ground surface and have watertight <br /> ` seals to reduce surface-water infiltration. A specially designed <br /> wrench is required to open the box. This design discourages <br /> vandalism and reduces the possibility of accidental disturbance <br /> �a to the well. <br /> Well development and Ground-Water Sampling <br /> Depths to water in the monitoring wells were measured on October <br /> 26, 1988, to the nearest 0.01-foot with an electric water-level <br /> indicator. Ground-water samples were then collected from the <br /> monitoring wells for subjective analyses by lowering <br /> ..approximately-half--the---length--of- a-Teflon--bailer--past--tY e�nir=-- ----- - ------- -- - ---- -- ---- <br /> 10 <br /> �,W116d GOOSystams <br />