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�` A //ed GeoS�stems 4191-E Power Inn Road, Sacramento, CA 95826 (91[) 452-2901 <br /> • FREMONT e COSTA MESA * SACRAMENTO Y HOUSTON <br /> August 19, 1988 <br /> 0803SEPP <br /> AGS Job No. 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 <br /> Beacon Station No. 1-502, 35 North Cherokee Lane, Lodi, <br /> California. <br /> Mr. Epperson: <br /> A geologist from our office visited the site referenced above on <br /> June 7, 1988, to purge and sample five ground-water monitoring <br /> wells. The work was implemented at the request of Beacon oil <br /> Company as part of our 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, California. The <br /> location of the station is shown on the Generalized Site Plan, <br /> Plate P-1. Applied GeoSystems previously installed two 2-inch- <br /> diameter and three 4-inch-diameter ground-water monitoring wells <br /> (AGS Report No. 8691-6, dated April 22, 1987) . The locations of <br /> the wells relative to site facilities are depicted on the <br /> Generalized Site Plan, Plate P-2. Previous work, summarized in <br /> Fes"" our Work Plan (AGS Report No. 8691-6, dated May 26, 1987) , <br /> indicated that the soil in the area immediately adjacent to and <br /> below the tank cavity is contamina�_ed with hydrocarbons. Work <br /> condLcted at the site during this phase included resurveying the <br /> relative elevations of all well casings to allow topographic <br /> corrections, and installing a new utility box on monitoring well <br /> MW-3 to allow access to the well. <br /> Depth-tai-ground-water measurements were taken in the monitoring <br /> wells prior to purging and sampling. Water-level data, <br /> surjnarized in Table 1, indicat4 that 10 at the time of <br /> measurement, the ground-water surface in the monitoring wells had <br /> dropped an average of i.00 foot since the previous sampling event <br /> and 2) the ground-water gradient had retained a southwesterly <br /> orientation (south 19 degrees west) and magnitude (0.33 vertical <br /> feet per 100 horizontal feet) similar to those observed in <br /> previous sampling events (Plate P-2) . The data from well MW-5 <br />