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�evron <br /> Chevron <br /> r `-- Chevron U S A Products Company <br /> November 5, 1996 _ _ 6001 Bollinger Canyon Road <br /> _—--~ -_- - Budding L <br /> Sari Ramon CA 94583 <br /> PO Box 5004 <br /> Ms Mary Ways San Ramon CA 94583-OB04 <br /> San Joaquin County Environmental Health <br /> P O Box 388 Marketing--Northwest Region <br /> Stockton, CA 95201-0388 <br /> Phone 510 842 9500 <br /> Re Former Chevron Station#9-1918, 45 East Hartung Way, Stockton, CA <br /> Attached groundwater monitoring report(Blaine Tech, 9/19/96) <br /> Dear Ms Ways <br /> Attached you will find a report dated September 19, 1996,which was prepared by Chevron's consultant, <br /> Blaine Tech Services Inc (Blaine Tech),to describe the results of groundwater momtonng that was <br /> performed at the subject site on July 30, 1996 <br /> During their July site visa,Blaine Tech gauged and sampled all fourteen site-related wells All <br /> groundwater samples were analyzed for the presence of TPHGas, BT'EX constituents, and MTBE The <br /> measured direction 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 MW-4, MW-6,and MW-9 There were 210 ppb MTBE detected at weII 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 TPHGas 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 consideration Comments by your <br /> agency regardmg the closure report have been received by Chevron An'd are being addressed to 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(510) 842-8695 <br /> Sincerely, <br /> Brett L Hunter <br /> Environmental Engineer <br /> Site Assessment and Remedhatson <br />