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App led �sfems/nc _ - <br /> A RESNA Company <br /> MAN-AP = <br /> Environmental Solutions <br /> Through Applied Science, <br /> 3164 Gold Camp Drive, Suite 200 Engineering&Construction <br /> Rancho Cordova, CA 95670 <br /> Phone (916) 852-6690 <br /> FAX (916) 852-6688 <br /> June 30, 1992 <br /> Ms Penny Silzer <br /> Unocal Corporation <br /> 2000 Crow Canyon Place, Suite 400 <br /> San Ramon, California 94583 <br /> Subject: Status of Environmental Investigation and Addendum to Work Plan, First <br /> Quarter 1992, Unocal Service Station No. 6981, 4707 Pacific Avenue, <br /> Stockton, California, <br /> Ms. Silzer: <br /> This report summarizes the status of the environmental investigation performed by RESNA <br />�j Industries (RESNA) for Unocal Corporation (Unocal) and presents an addendum to the <br /> work plan for additional work at the subject site The site is shown on the Site Vicinity Map <br /> (Plate 1) Work performed this quarter included drilling eight soil borings, installing three <br /> ground-water monitoring wells and four vapor-extraction wells, collecting and analyzing soil <br /> and ground-water samples, and conducting a vapor-extraction test The approximate <br /> locations of the tanks and other selected site features are shown on the Generalized Site <br /> Plan (Plate 2) <br /> PREVIOUS WORK <br /> RESNA (formerly Applied GeoSystems) has investigated the extent of gasoline <br /> hydrocarbons to the soil and ground water onsite The results of the work performed during <br /> our investigation are described in Applied GeoSystems' Reports No 38032-1, July 8, 1988, <br /> No. 38032-2V,January 12, 1989, No 38032-3, February 19, 1991, No 38032-6, May 13, 1991, <br /> August 13, 1991, September 16, 1991, and January 10, 1992 Results from these previous <br /> investigations indicate that soil with residual hydrocarbons is present at depths greater than <br /> 18 feet below ground surface beneath the northeast and southwest corners of the dispenser <br /> island pad and beneath the northeast corner and center of the underground storage tank pit <br /> at depths below 18 to 22 feet below ground surface Residual hydrocarbons are not present <br /> in soil above the capillary fringe near borings B-1 and B-3 Dissolved gasoline hydrocarbons <br /> o305psd <br /> 38032-7 <br /> i <br />