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Chemmn <br /> a Chevron <br /> Chevron Products Company <br /> March 2, 1997 6001 Bollinger Canyon Road <br /> Building L <br /> San Ramon CA 94583 <br /> PO Box 6004 <br /> San Ramon CA 94583 0904 <br /> Mr Harlin Knoll Marketing—Sales West <br /> San Joaquin County Public Health Services Phone 510 842-9500 <br /> P O Box 388 <br /> Stockton, CA 95201-0388 <br /> Re Former Chevron Station# 9-8632 575 Grantlme Rd Tracy, CA <br /> Attached Groundwater Monitoring Report(Blaine Tech, 3/5/96) <br /> Dear Mr Knoll <br /> Please find attached a report dated March 5, 1996 which was prepared by Chevron's consultant, Blaine <br /> Tech Services(Blaine Tech) to describe the results of groundwater momtorng that was performed at the <br /> subject site on February 7, 1996 <br /> During the February monitoring event Blaine Tech gauged and sampled all four site-related wells All <br />• samples collected were analyzed for the presence of TPHGas, TPHDiesel, and BTEX constituents In <br /> addition, samples collected from well MW-1 were analyzed for halogenated volatile organic compounds <br /> (HVOC s), semi-volatile organic compounds(SVOC's), total metals, and total oil and grease The <br /> measured direction of groundwater flow was toward the northwest <br /> There were dissolved petroleum hydrocarbons detected at all wells Unidentified hydrocarbons measured <br /> within the TPHDiesel range were reported at each well These concentrations ranged between 140 ppb at <br /> well MW-2 to 650 ppb at well MW-4 The highest detections of benzene(730 ppb)were measured at well <br /> MW-4 There were no detectable concentrations of HVOC's, SVOC's or total oil and grease reported for <br /> well MW-1 There were only 21 ppb of zinc detected in groundwater at well MW-1 These levels are <br /> thought to be representative of background conditions All other metals were non-detect <br /> If you have any questions or comments, please contact me at(510) 842-8695 <br /> Sincerely, <br /> /(Y,UW �e /v& <br /> Brett L Hunter <br /> Environmental Engineer <br /> Site Assessment and Remediation <br /> Attachment <br /> cc Elizabeth Thayer Central Valley RWQCB, Sacramento, CA <br /> Kathryn Pudenz, 519 Castro St , Baa 88, San Francisco, CA 94114 <br /> Stella Rickman, P O Box 244, Tracy, CA 95378 <br /> Bette Owen, Clievron Products Company, San Ramon, CA(w/o attach) <br />