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� rr <br /> Efil'[R lJ;�VV �: et Chevron <br /> Phi r el,rV11# t, ,�s���.HEAI_TH Chevron <br /> 93 AL16 —3 pH9y:,tj 3't' PN 1: 17 <br /> Chevron U.S.A.Products Company <br /> 2410 Camino Ramon <br /> July 30, 1993 San Ramon,CA 94583 <br /> Marketing Department <br /> Phone 510 842 9500 <br /> Mr. Michael Infuma <br /> San Joaquin County Environmental Health <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> Re: Former Chevron Station#9-4054. 2103 Country Club Blvd Stockton CA <br /> Attached groundwater monitoring reports (GTI;2/8/93,5/21/93) <br /> Dear Mr. Infuma: <br /> Attached are reports dated February 8, 1993 and May 21, 1993, which were prepared by <br /> Chevron's consultant, Groundwater Technology, Inc. (GTI), to describe groundwater monitoring <br /> performed at the subject site on January 15, 1993 and April 21, 1993. <br /> During the January monitoring event the groundwater gradient direction was determined to be <br /> toward the northeast. The measured concentrations of dissolved hydrocarbons were consistent <br /> with levels measured during previous groundwater monitoring events. No separate phase <br /> hydrocarbons were detected in any of the monitoring wells. <br /> The groundwater gradient direction measured during the April monitoring event was also toward <br /> the northeast. The measured concentrations of dissolved hydrocarbons increased in all monitoring <br /> wells. This observed increase is coincident with a three to four foot increase of groundwater <br /> elevation since January. Separate phase hydrocarbons were detected in monitoring wells MW-1 and <br /> MW-2. <br /> These latest groundwater monitoring results are being evaluated, along with other historic site data, <br /> to determine an appropriate plan of corrective action. If you have any questions or comments, I can <br /> be reached at(510) 842-8695. <br /> Sincerely, � <br /> ,[� JJ- / <br /> Brett L. Hunter <br /> Environmental Engineer <br /> Site Assessment and Remediation <br />