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n�evecn <br /> Chevron <br /> Nov 1 1 19S6`-- Chevron U S A Products Company <br /> November 5, 1996 �i '=_'� 6001 Bollinger Canyon Road <br /> `_�-- ---- Building L <br /> San Ramon CA 94583 <br /> PO Box 5004 <br /> Ms Mary Meays San Ramon,CA 94583-0804 <br /> San Joaquin County Environmental Health <br /> P O Box 388 Marketing_Northwest Region <br /> Stockton, CA 95201-0388 Phone 510 842 9500 <br /> Re Former Chevron Station 4 9-1918,45 East Harding Way, Stockton, CA <br /> Attached groundwater monitoring report(BIame Tech, 9/19196) <br /> Dear Ms Meays <br /> Attached you will find a report dated September 19, 1996,which was prepared by Chevron's consultant, <br /> Blaine Tech Services Inc (Blame Tech), to describe the results of groundwater monitoring that was <br /> performed at the subject site on July 30, 1996 <br /> During their July site visit,Blame Tech gauged and sampled all fourteen site-related wells All <br /> groundwater samples were analyzed for the presence of TPHCras,BTEX constituents, and MTBE The <br /> measured duwaon of groundwater flow was variable Previous measurements have shown a consistent <br /> direction of east-northeasterly Detectable concentrations of dissolved hydrocarbons were measured at <br /> wells MWS,MW-6,and MW-9 There were 210 ppb MTBE detected at well MW-9 The groundwater <br /> results at all other wells were non-detect. The measured levels at wells MW-4 and MW-6 were consistent <br /> with those detected during the second quarter monitoring event.The reduction of TPHC;as concentrations <br /> and absence of benzene at these wells attests to the effectiveness of previous hydrocarbon remediation <br /> efforts <br /> Chevron has submitted a closure summary report to your agency for consideratson Comments by your <br /> agency regarding the closure report have been received by Chevronaad4re being addressed in a revised <br /> version The revised closure summary report should be.-submitted to your agency by November 15, 1996 <br /> If you have any questions or comments,I can be reached at(5 10) 842-8695 <br /> Sincerely, <br /> Brett L Hunter <br /> Environmental Engineer <br /> Site Assessment and Remediation <br />� s <br />