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Chevron <br /> Chevron <br /> Chevron Products Company <br />! 6001 Bollinger Canyon Road <br /> February 28, 1997 Building L <br /> San Ramon,CA 94583 <br /> P.O.Box 6004 <br /> San Ramon,CA 94583-0904 <br /> Ms. Mary Meays Marketing—Sales West <br /> San Joaquin County Environmental Health Phone 510 842-9500 <br /> P.O.Box 388 <br /> Stockton, CA.95201-0388 <br /> Re: Chevron Station#9-4275, 2905 West Benjamin Holt Drive, Stockton,CA <br /> Attached groundwater monitoring report(Blaine Tech, 1/9/97) <br /> Dear Ms. Meays: <br /> Please find attached a report dated, January 9, 1997,which was prepared by Chevron's consultant,Blaine <br /> Tech Services, Inc. (Blaine Tech), to describe the results of groundwater monitoring that was performed at <br /> the subject site on December 4 1996. <br /> During the December site monitoring event Blaine Tech gauged and sampled eight of the nine site-related <br /> wells.Monitoring well MW-3 was inaccessible. All groundwater samples were analyzed for the presence' <br /> of TPHGas,BTEX constituents, and MTBE. The measured direction of groundwater flow was toward the <br /> northeast. There were detections of dissolved petroleum hydrocarbons at all wells except,MW-4 and MW- <br /> 7. The measured concentrations were consistent with those detected previously at the subject site except, <br /> for increased levels of TPHGas,BTEX, and MTBE at well MW-9. These detections confirm those <br /> reported for the previous monitoring event. Considering the consistent direction of groundwater flow <br /> beneath the site, the position of MW-9 relative to those potential source areas onsite,.the absence of <br /> similar trends in adjacent wells MW-1 and MW-2, and the recent(1995) release of motor fuel at the <br /> ARCO service station, it would-appear that the observed trend at well MW-9 is reflective of an upgradent, <br /> offsite source. <br /> The remediation system recently installed at the subject site was started-up on February 20,1997. Full time <br /> operation will be implemented as soon as permission is secured from the San Joaquin Valley Unified Air. <br /> Pollution Control District. <br /> If you have any questions or comments,I can be reached at(510)842-8695. <br /> Sincerely, <br /> Brett L.Hunter <br /> Environmental Engineer <br /> Site Assessment.and Remediation <br /> °F1e ys;!a�'th <br />