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uu 1}1} Chevron <br /> Chevron <br /> 9L, D;7. 19 PH 2: 12 <br /> Chevron U.SA Products Company <br /> 6001 Bollinger Canyon Rd., Bldg. L <br /> P.O. Box 5004 <br /> December 14, 1994 San Ramon, CA 94583-0804 <br /> Site Assessment& Remediation Group <br /> Phone(510)842-9500 <br /> Ms. Mary Meays <br /> San Joaquin County Environmental Health <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> Re: Chevron Station#9-6171. 6633 Pacific Avenue, Stockton, CA <br /> Attached groundwater monitoring report(Sierra, 10/27/94) <br /> Dear Ms. Meays: <br /> Attached you will find a report dated October 27, 1994, which was prepared by Chevron's <br /> consultant, Sierra Environmental Services(Sierra), to describe groundwater monitoring performed <br /> at the subject site on October 4, 1994. <br /> During their October site visit Sierra gauged and sampled all six site-related wells. The measured <br /> direction of groundwater flow was toward the southeast. Groundwater samples from each well <br /> were analyzed for the presence of TPHGas and BTEX constituents. Detectable concentrations of <br /> petroleum hydrocarbons were measured at well MW-2. The measured concentrations were <br /> consistent with those detected during previous site monitoring events. <br /> It should be noted that the laboratory reporting limits for TPHGas, toluene, ethylbenzene, and <br /> xylenes do not conform with the reporting limits specified by the Tri-Regional Board Staff <br /> recommendations. Chevron has requested a revised lab report from GTEL to reflect the lower <br /> reporting limits. The revised report will be submitted under separate cover. It should be further <br /> noted that the TPHGas chromatographic patterns for samples MW-4 and MW-5 were not typical of <br /> the gasoline standard. The atypical patterns were caused by the presence of high concentrations of <br /> non-target compounds. As a result, these samples had to be diluted. The presence of the non-target <br /> compounds obscured the actual concentration of TPHGas at MW-4. During personal <br /> communication with GTEL it was revealed that the non-target compounds could be chlorinated <br /> solvents. This is highly probable since drycleaning solvents have been previously detected at both <br /> well locations. <br /> I would also like to take this opportunity to address your question as to when Chevron would be <br /> replacing underground product piping at the subject site. According to the current capital budget <br /> schedule, the product piping upgrades at the subject site will occur by mid-year, 1996. <br /> If you have any questions or comments, I can be reached at(510) 842-8695. <br /> Sincerely, <br />