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s 1 by1aui,i L , r 000 Delta Ra'ie c) Rancho Crr,i7 F021 Environmental LJ S A Consultants,Inc 916 6,38 1085 SAX (41 b b Iii cs 3ri� April 13, 2000 1 ' Mr Darin L Rouse ExxonMobil Corporation 2300 Clayton Road, Suite 1250 ' Concord, CA 94520 Subject Quarterly Ground Water Monitoring Report, First Quarter 2000 Former Exxon Service Station No 7-3708 2705 Country Club Boulevard Stockton, California ' Delta Project No D093-809 Dear Mr Rouse Delta Environmental Consultants, Inc (Delta) has been authorized by ExxonMobil Corporation (Exxon) to prepare a report summarizing quarterly ground water monitoring conducted by Blaine Tech Services at the above-mentioned site, which is currently a U S A Petroleum Station This report presents the results of quarterly ground water monitoring and sampling conducted on February 10, 2000 Work conducted at the site by Blaine Tech Services was performed in accordance ' with the field methods and procedures described in Enclosure A Work Performed ' On February 10,2000, depth to ground water was measured 1n monitoring wells MW-1 and MW-4 through MW-10 The measurements were used to construct a ground water elevation contour map, which is included as Figure 1 Monitoring wells MW-2 and MW-3 were not measured Based on the ' ground water elevation contours illustrated in Figure 1, ground water flow at the site was generally to the northeast with a hydraulic gradient of approximately 0 005 Cumulative ground water measurements are presented in Table 1 ' Ground water samples were collected from monitoring wells MW-1 and MW-4 through MW-10 on February 10, 2000 Monitoring wells MW-2 and MW-3 were not sampled The samples were ' submitted to Southern Petroleum Laboratories (a California-certified laboratory) for analysis of benzene,toluene, ethylbenzene,total xylenes, methyl tertiary butyl ether(MTBE),tert-butyl ethyl ether, tert-amyl methyl ether, dusopropyl ether, t-butyl alcohol, and 1,2-dichloroethane using EPA ' Method 8260B and total purgeable petroleum hydrocarbons (TPPH)as gasoline, methanol, and ethanol using EPA Method 8015 Modified A map illustrating concentrations of benzene, TPPH as gasoline and MTBE for the February 10, 2000 sampling event is included as Figure 2 Cumulative ground water ' analytical results are summarized in Table 1 Copies of the field data sheets are presented in Enclosure B A copy of the laboratory analytical report with chain-of-custody documentation for the February 10, 2000 sampling event is presented in Enclosure C ' Huvidirig a Competitive Edge