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�1 `Chevron <br /> „ Chevron <br /> � <br /> 01. <br /> -P PF r 25 <br /> Chevron U.S.A.Products Company <br /> 6001 Bollinger Canyon Road <br /> August 29, 1994 Building L <br /> San Ramon,CA 94583 <br /> P0.Box 5004 <br /> San Ramon,CA 94583-0804 <br /> Ms. Mary Meays Marketing—Northwest Region <br /> San Joaquin County Environmental Health Phone 510 842 9500 <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> Re: Chevron Station#9-0557, 139 South Center Street, Stockton, CA <br /> Attached groundwater monitoring reports (GTI;3/25/94, 6/17/94) <br /> Dear Ms. Meays: <br /> Attached you will find reports dated March 25, 1994 and June 17, 1994, which were prepared by <br /> Chevron's consultant,Groundwater Technology Inc. (GTI), to describe groundwater monitoring <br /> performed at the subject site on February 9, 1994 and May 27, 1994. <br /> During the February site monitoring event the measured direction of groundwater flow was toward <br /> the southeast. All six site-related wells were sampled and analyzed for the presence of TPHGas <br /> and BTEX constituents. Detectable concentrations of dissolved petroleum hydrocarbons were <br /> measured in five of the six site monitoring wells. The measured levels were similar to those <br /> observed during previous site monitoring events. Dissolved phase hydrocarbons were not detected <br /> in well MW-4. <br /> The measured direction of groundwater flow during GTI's May site visit was again, southeasterly. <br /> GTI sampled all six monitoring wells. Except for well MW-4, all wells contained detectable <br /> concentrations of TPHG and gasoline constituents. The measured concentrations were consistent <br /> with those detected during previous monitoring events. <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 Remediation <br />