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E <br /> Chevmn <br /> a [heron <br /> Chevron Products Company <br /> March 2, 1997 6001 Bollinger Canyon Road <br /> Building L <br /> San Ramon CA 94583 <br /> P 0 Box 6004 <br /> San Ramon CA 94583-0904 <br /> Mr Harlin Knoll Marketing—Sales West <br /> San Joaquin County Public Health Services Phone tin 842-9500les <br /> P O Box 388 <br /> Stockton, CA 95201-0388 <br /> Re Former - <br /> o er Chevron Station# 9 8632 575 Granthne Rd Tracy, CA <br /> Attached Groundwater Monitoring Report(Blaine Tech, 9124196) <br /> Dear Mr Knoll <br /> Attached you will find a report dated September 24, 1996 which was prepared by Chevron's consultant, <br /> Blaine Tech Services (Blaine Tech), to describe the results of groundwater monitoring that was performed <br /> at the subject site on August 20, 1996 <br /> In August Blaine Tech gauged and sampled all four site-related wells Samples from each well were <br /> analyzed for the presence of TPHGas, TPHDiesel, BTEX constituents, and MTBE Samples from well <br /> MW-1 were also analyzed for HVOC's, SVOC's, soluble metals, and total oil and grease The measured <br /> direction of groundwater flow was northwesterly This is consistent with previous flow direction <br /> measurements <br /> There were reported detections of dissolved petroleum hydrocarbons at each well The reported <br /> concentrations were similar to those detected during previous monitoring events Unidentified <br /> hydrocarbons within the diesel range of analysis were reported at all wells MTBE was detected at wells <br /> MW-I through MW-3 only There was no MTBE detected at well MW-4 There were no detectable <br /> concentrations of HVOC's or SVOC's Total oil and grease was detected(I2,000 ppb) at well MW-1 This <br /> detection is unusual and will be confirmed dunng the next sampling event There were 62 ppb of Zinc <br /> detected in groundwater at well MW-I These levels are thought to represent background conditions All <br /> other metals were non-detect <br /> The reported concentrations of unidentified hydrocarbons at each well are roughly proportional to the <br /> reported levels of TPHGas Additionally, Chevron has no records of diesel fuel being dispensed at this <br /> location As such, the unidentified hydrocarbons probably represent a highly weathered(old) gasoline <br /> detection Further analyses of these chromatograms should confirm this Results will be furnished as soon <br /> as they become available <br /> If you have any questions or comments, please contact me at(510) 842-8695 <br /> Sincerely, / <br />