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A piled GeoSyslems 4191-E Power Inn Road, Sacramewo,CA 95826 (916)452-2901 <br /> o EREMONT •COSTA NiE5A • SACRAMENTO ►HOUSTON <br /> December 1, 1988 <br /> AGS 86091-6 <br /> Mr. Steve Epperson <br /> Beacon Oil; Company <br /> 525 West Third Street <br /> Hanford, California 93230 <br /> Subject: Letter report of quarterly ground-water monitoring at r <br /> Beacon Station No. 1-502, 35 North Cherokee Lane, Lodi, <br /> California. <br /> Mr. Epperson: <br /> A geologist from our office was present at Beacon Station <br /> No. 1-502 in Lodi on September 6 through 9, 3,988, to purge and <br /> If <br /> sample five ground-water monitoring wells. The work was <br /> implemented at the request of Beacon oil Company as hart of our <br /> ongoing environmental investigation. <br /> The site is located on the southwest corner of the intersection <br /> of North Cherokee Lane and Elm Street in Lodi. The location of E <br /> the station is shown on the Site VicinityMa <br /> Applied Geos stems 2 (plate 2-inch-diameter <br /> Y previously installed one 2-inch-diameter and <br /> four 4-inch-diameter <br /> ground-water monitoring wells. The � <br /> locations of the wells relative to site facilities are depicted <br /> on the Generalized Site Plan (Plate P-2) . Previous work ` <br /> indicated that the soil in; the area immediately adjacent to and <br /> below the tank cavity is contaminated with. hydrocarbons (AGS <br /> ~ Report No. 8691-3, dated November '7, 1986) . <br /> Depths to ground water were measured in the monitoring well prior <br /> to purging and sampling. Water-level data, which are summarized ' <br /> k in Table 1, indicate that 1) at the time of measurement, the <br /> ground-water surface in the monitoring wells had dropped an c. <br /> average of 3.05 feet since the previous sampling event and 2) the ` <br /> average ground-water flow direction was south 55 degrees west, <br /> similar to that observed in previous sampling events; the <br /> calculated average grac,ient (0.62-foot vertical per 100 feet <br /> horizontal) was found to be somewhat greater than those obtained _ <br /> --- - from--previous events:- In contras-to previous events, the data <br /> from well MW-3 were inconsistent with those from the other wells <br /> and wereexcluded from the-gradient calculation. <br /> e <br />