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Unocal Refining&Marketing Division <br /> Unocal Corporation <br /> 2000 Crow Canyon Place,Suite 400 <br /> PO Box 5155 <br /> San Ramon,California 94583 <br /> Telephone(510)867-0760 _ <br /> F <br /> w s. <br /> UNOCAL* J U L 2 9 1992 <br /> July 15, 1992 PERMIT/S[«VICUi <br /> Harlin Knoll <br /> Northern Division San Joaquin County <br /> Public Health Services <br /> 445 No. San Joaquin Street <br /> Stockton, California 95201 <br /> UNOCAL SERVICE STATION #5421 <br /> 7303 Pacific Avenue <br /> Stockton, Ca. <br /> Dear Mr. Knoll <br /> I regret the delay in sending you Kaprealian's report dated February 3 , <br /> 1992 , for the above referenced site. Hopefully this holdup will not <br /> cause any difficulties. <br /> Monitoring and sampling results for the last four quarters indicate a <br /> consistent groundwater flow direction and non-detectable levels of TPHg <br /> and Benzene. Levels of diesel contamination in monitoring well M11-1 have <br /> been non-detectable for the past two quarters. KEI recommends, and I <br /> concur, that monitoring be reduced from monthly to quarterly and sampling <br /> be reduced from quarterly to semi-annually. All samples will be analyzed <br /> for TPHg and BTEX. MW-1 will also be analyzed for TPH as diesel , but <br /> since there have been no detectable levels of TOG in any samples from <br /> well MW-1, we propose to discontinue this analysis. <br /> I would also like to inform you that this station has been targetecl by <br /> Unocal for divestment in July of 1993 . Additional sub-surface <br /> investigations will be performed to identify any possible sources of <br /> contamination. A clean-up will be undertaken shortly after the station <br /> ceases operation. As much of the contaminated soil and/or water as <br /> possible will be removed in an effort to receive a clean closure prior to <br /> selling the property. Any extra sampling at this time seems pointless. <br /> I may be reached at (510) 277-2334 if you have any questions . <br /> S,i,ncerely, <br /> wvl� <br /> Robert Boust <br /> Senior Environmental Engineer <br />