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gmg- <br /> WPM' Ecs '. fir' c.' •T' F°`'o,- '-43 y -t+u� <br /> .a <br /> July 16, 1987 AGS Job No. 87048-1 <br /> Beacon Station #675 - Lockeford, CA <br /> drilling and well construction during operations conducted from <br /> June 4 through June 12, 1987. Drilling problems were encountered <br /> that resulted in two instances of augers being lost in the hole - <br /> and considerable drilling delays. Four borings were drilled with <br /> a Mobile B-61 truck-mounted drill rig operated by Datum <br /> Exploration, Inc. of Pittsburg, California. "1'wo borings were <br /> located in the. inferred downgradient direction from the <br /> underground tank cluster; to evaluate potential hydrocarbon ' <br /> A third boring was located in the <br /> contamination from the tanks. <br /> inferred upgradient direction of the underground tanks to <br /> establish background soil and ground water quality data. The <br /> fourth boring was drilled in the inferred downgradient direction <br /> from the product lines and dispensers to evaluate potential <br /> contamination from these sources. <br /> Steam-cleaned, 8-inch diameter, continuous flight hollow-stem iE <br /> augers were used to drill borings B-1 through B-4 to a depth of <br /> approximately 81 feet. This depth was considered sufficient to <br /> install the ground water monitoring wells. Ground water was <br /> initially encountered at approximately 65 feet below the ground <br /> surface during drilling. Monitoring well MW-1 was installed in <br /> boring B-1, MW-2 in boring B-2, MW-3 in boring B-3, and MW-4 in <br /> boring B-4. Locations of monitoring wells at the site are shown <br /> on the Generalized Site Plan. <br /> 3 <br />