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.. s ` 1 • _ <br /> Chevron <br /> wo <br /> Chevron <br /> Chevron Products Company <br /> 6001 Bollinger Canyon Road <br /> February 28, 1997 Building L <br /> San Ramon,CA 94583 <br /> P.O.Box 6004 <br /> San Ramon,CA 94583-0904 <br /> Ms. Mary Meays Marketing=Sales W <br /> San Joaquin County Environmental Heatinest <br /> lth Phone tin 8479500 .. <br /> P.O. Box 388 <br /> Stockton, CA 95201-0388 <br /> Re: -Chevron.Station#9-0557, 139 South Center Street, Stockton, CA <br /> Attached groundwater'monitoring report(Blaine Tech, 11/7/96)- <br /> Dear Ms.Meays: <br /> .Please find attached a report,dated November 7, 1996,which.was prepared by Chevron's consultant, <br /> Blaine Tech Services Inc. (Blaine Tech),.to describe the results.of groundwater monitoring that was <br /> performed at the subject site during August and-September, 1996. <br /> Blaine'Tech gauged and sampled six of the sevensite-related wells in August. Well MW-7 was not <br /> monitored: In September,Blaine Tech gauged alLaeven wells and sampled well MW-7.,All samples were s <br /> analyzed for the presence of TPHGas;BTEX constituents,and MTBE. The measured direction of <br /> groundwater flow beneath the subject site was toward the outheast.:This is consistent with historic trends.` <br /> There were detectable concentrations of dissolved petroleum;hydrocarbons measured at.wells MW-1, <br /> MW-2;MW-5;and MW-7. The measured concentrations were consistent with recent detections. There <br /> was MTBE,present at each of these wells. Therewereno dissolved,hydrocarbons or MTBE reported above <br /> detection limits at wells MW-3,MW-4-or MW-6.All seven monitoring wells had-groundwater above the <br /> screened intervals by as much as 1.3 to 4.6 feet. l <br /> If you have any.questions or comments,I can be reached at(510)-842-8695. <br /> -Sincerely, <br /> Brett L. Hunter <br /> Enviromnental Engineer <br /> Site Assessment and Remediation <br /> Attachment <br /> cc: Elizabeth Thayer,Central Valley RWQCB Sacramento, CA <br /> Tom Portele, Greyhound Lines,P.O. Box 660362,Dallas,TX 75266-03:62 <br />