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r <br /> Chevron <br /> Chevron <br /> Chevron Products Company <br /> 6001 Bollinger Canyon Road <br /> March 2, 1997 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 Grantline Rd Tracy, CA <br /> Attached Groundwater Monitoring Report(Blaine Tech, 6111196) <br /> Dear Mr Knoll <br /> Attached you will find a report dated June 11, 1996 which was prepared by Chevron's consultant, Blaine <br /> Tech Services(Blaine Tech), to describe the results of groundwater monitoring that was performed at the <br /> subject site on May 7, 1996 <br /> During their May site visit Blaine Tech gauged and sampled all four site-related wells Samples from each <br /> • well were analyzed for the presence of TPHGas,TPHDiesel, BTEX constituents, and MTBE in addition, <br /> samples collected from well MW-I were analyzed for halogenated volatile organic compounds(HVOC's), <br /> semi-volatile organic compounds (SVOC's), soluble metals, and total oil and grease The measured <br /> direction of groundwater flow was again, toward the northwest Please note,Blaine's report also presents <br /> results for MTBE that was sampled for during the previous monitoring event <br /> There were dissolved petroleum hydrocarbons detected at all wells The reported concentrations were <br /> similar to those detected during previous monitoring events MTBE was detected at wells MW-1 through <br /> MW-3 The reported concentrations ranged between 480 ppb to 1300 ppb There were no detectable <br /> concentrations of HVOC's, SVOC's or total oil and grease reported for well MW-1 There were detections <br /> of Zinc and Chromium detected in groundwater at well MW-1 These detections are thought to be <br /> 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 /> IJA�Wqj_l <br /> Brett L Hunter <br /> Environmental Engineer <br /> Site Assessment and Remediation <br /> ri <br />