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!. 3330 Data Drive Delta Suite 100 1/n/k Rancho Cordova, CA 95670 Environmental 916/638-2085 Consultants,Inc. FAX:9161638-8385 September 14, 1993 REUMVEL) Ms. Maria Guensler 0 C T 2 7 1993 Exxon Company, U.S.A. ENVIRONMENTAL HEW11 Post Office Box 4032 Concord, California 94524-2032 PERMIT/SERVICES Subject: Soil Investigation Report Exxon Retail Station No. 7-3330 3128 West Benjamin Holt Drive Stockton, California Delta Project No. 40-93-810 Dear Ms. Guensler: Delta Environmental Consultants, Inc. (Delta), has been authorized by Exxon Company, U.S.A., to investigate the extent of petroleum hydrocarbons in soil at Exxon Retail Station No. 7-3330, located at 3128 West Benjamin Holt Drive, Stockton, California_ This letter report describes the field investigation and presents analytical results for soil samples collected on duly 15, 1993. The location of the site is shown in Figure 1 and site features are illustrated in Figure 2. All work conducted at the site by Delta was performed in accordance with the methods and procedures described in Enclosure A. Background The site was operated as an Exxon service station from 1968 until the station was demolished in September 1991. Three underground fuel storage tanks, one underground waste oil tank, and the associated piping were removed from the site in October 1991. On May 30, 1992, 12 soil samples were collected from an excavation at the former pump island location. Analytical results indicated that soil samples collected from the east and south sidewalls of the excavation at the former pump island location contained concentrations of total petroleum hydrocarbons (TPH) as gasoline ranging from 25 to 210 parts per million (ppm). Ten soil samples were collected from the sidewalls of the former underground gasoline storage tank excavation on April 4, 1992. The samples were submitted to a certified analytical laboratory for analyses of benzene, toluene, ethylbenzene, xylenes (BTEX), and TPH as gasoline. Concentrations of BTEX and TPH were not detected in these samples with the following exceptions: two soil samples collected from the southwest corner of the excavation contained relatively low concentrations of benzene (0.0081 ppm and 0.0091 ppm) and xylenes (0.013 ppm and 0.0091 ppm). On April 11, 1992, additional soil was removed from the sidewalls of the excavation. Further information regarding this work can be found in the Soil Remediation Report, by Artesian Environmental Consultants, July 1992. Delta Delivers Solutions