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i <br /> Subsurface Environmental Investigation september 21, 1988 <br /> Abandoned Lerner Service Station, Lodi, California AGS 38055--1 <br /> The annular space of the well was packed with sorted sand to <br /> approximately 3 feet above the top of the screen. A bentonite <br /> seal approximately 3 feet was placed above the sand to prevent <br /> cement from entering the sand pack. The remaining annulus was <br /> backfilled with a mixture of cement and bentonite to the ground <br /> .urface. The construction details of the well are <br /> graphically <br /> depicted on Plates P-9 through P-11. ' The well head was secured <br /> in a cast-aluminum utility box with a PVC .apron. The box was set <br /> in concrete flush with the surrounding grade and has a watertight <br /> seal. A spo'cially designed wrench is required to open the box; <br /> this design discourages vandalism and reduces the possibility of <br /> accidental disturbance of the well. A. locking cap has been <br /> placed on the PVC casing. <br /> ' Ground-Water Sampling <br /> On August 22, 1988, a geologist from Applied Geosystems visited <br /> the site to :measure the depth to water in the monitoring well, <br /> subjectively analyze the ground water in the well, and develop <br /> t <br /> the monitoring well. The depth to water was measured to the <br /> nearest 0.01-foot with an electric water-level indicator. The <br /> water level at the time 'of Meas,urement__was .40-25--feet below the-----____ground surface. A ground--water sample was collected from the <br /> air-fluid interface in the monitoring well for subjective <br /> 9 <br /> 4pc�/led �eoS�stems — J <br />