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r <br /> Chevron <br /> IZZO <br /> Chevron <br /> Chevron Products Company <br /> February 28, 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 <br /> San Joaquin County Public Health Services Marketing—Sales West <br /> P O BOX 388 <br /> Phone 510 842 9500 <br /> Stockton, CA 95201-0388 <br /> Re Chevron Station#9-2033 508 W Charter Way, Stockton CA <br /> Attached Groundwater Monitonng Report(Blaine Tech, 7/9/96) <br /> Dear Mr Knoll <br /> Attached you will find a report dated July 9, 1996, 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 May 15, 1996 <br /> In May, Blaine Tech gauged and sampled all three site-related wells The measured direction of <br /> groundwater flow beneath the site was southerly All groundwater samples collected were analyzed for the <br /> presence of TPHGas, BTEX constituents and MTBE Additional samples from well MW-1 were collected <br /> on June 19, 1996 and were analyzed for waste oil constituents <br /> Dissolved petroleum hydrocarbons were detected at wells MW-1 and MW-3 The measured concentrations <br /> of dissolved hydrocarbons were lower than those previously detected at these wells The decrease in <br /> concentrations appears to be associated with groundwater levels being above the screened intervals in <br /> these wells(2 l - 3 3 ft) There were no dissolved hydrocarbons detected at well MW-2 Despite the <br /> submerged screen condition, the measured levels at well MW-2 were consistent with historic levels There <br /> were also detections of 1,2 Dichloroethane and TPHDiesel-range hydrocarbons at well MW-1 The <br /> measured levels were consistent with those detected previously The compound 1 2 Dichloroethane was a <br /> minor constituent of leaded fuels in the past The presence of this compound at well MW-1 may be <br /> reflective of an older release of leaded gasoline to the subsurface rather than, a release of degreasing <br /> solvent from the adjacent waste oil tank The presence of MTBE was detected at well MW-1 only There <br /> were no detections of total oil and grease or SVOC's at well MW-1 this quarter <br /> If you have any questions or comments, 1 can be reached at(510) 842-8695 <br /> Sincerely, <br /> Brett L Hunter <br /> Environmental Engineer <br />. Site Assessment and Remediation <br /> 4 � <br /> r •p, , <br />