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/Qeplied GBOSy'stems 4191-E Power Inn Road, Sacramento, CA 95826 (916) 452.2901 • FREMQNT • COSTA MESA • SACRAMENTO C HOUSTON June 29, 1988 0629SEPP AGS Job No. 86091-6 Mr. Steve Epperson Beacon Oil Company 525 West Third Street Hanford, California 93230 f Subject: Report of quarterly ground-water monitoring at Beacon Station No. 1-502, 35 North Cherokee Lane, Lodi, a California. Mr. Epperson: A geologist from our office visited the site referenced above on January 14 and 15, 1988 to purge and sample five ground-water monitoring wells. The work was implemented at the request of >4 . Beacon Oil Company as part of our ongoing environmental investigation. The site is located on the southwest corner of the intersection of North Cherokee Lane and Elm Street in Lodi, California. The Site Vicinity Map, Plate P-1, shows the location of the station. Applied GeoSystems previously installed two 2-inch-diameter and three 4-inch-diameter ground-water monitoring wells (AGS Report No. 8691-6, dated April 22, 1987) . The locations of the wells relative to site facilities are depicted on the Generalized Site Plan, Plate P-2. Previous work summarized in our Work Plan (AGS Report No. 8691-6, dated May 26, 1987) , indicated that the soil in the area immediately adjacent to and below the tank cavity is contaminated with hydrocarbons. Depth-to-ground-water measurements were taken in the monitoring wells prior to purging and sampling. Access to well MW-3 could not be gained, however, so data from that well are not available. Water-level data (Table 1) indicate that the ground--water surface has dropped approximately 3.56 feet since the previous sampling event, and that the ground-water gradient had retained a southwesterly orientation (S20'W) and magnitude (0.4 vertical feet per 100 feet horizontally) similar to those observed in previous sampling events (Plate P-2) .