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r Unocal Refining&Marketing Division <br /> Unocal Corporation <br /> 2000 Crow Canyon F1 Suite 400 <br /> San Ramon,California_+583 <br /> Telephone(415)867-0760 <br /> UNOCAL 76 <br /> mac= March 4, 1991 <br /> Northern Division � j;; ,.,. Ms. Diane Hinson <br /> MAR 19M Environmental <br /> Joaquin County Public Health <br /> Environmental Health Division <br /> ENVIRONMENTAL HEALTH P. o. Box 2009 <br /> PERMIT/SERVICES Stockton, California 95201 <br /> FORMER UNOCAL STATION NO. 5098 <br /> 5606 Pacific <br /> Stockton, California <br /> Dear Ms. Hinson: <br /> I want to take this opportunity to thank both yourself and Margaret <br /> Lagorio for allowing time from your schedules to meet with us on such <br /> short notice to discuss the status of the above-referenced site. I <br /> feel the meeting was very productive in bringing both sides "up to <br /> speed" with respect to all the work (both environmental and <br /> construction) which has occurred at this site. <br /> The purpose of the meeting was to discuss the October 24, 1990 letter <br /> to Unocal requesting additional site assessment to completely <br /> delineate the extent of any groundwater contamination at the subject <br /> site. In addition, the letter makes reference to the fact that our <br /> previously submitted Remediation Plan failed to propose complete soil <br /> cleanup. <br /> With respect to the soil remediation, please refer to the report <br /> prepared by Kaprealian Engineering, Inc. (KEI-P88-1013 ) dated <br /> December 15, 1988 documenting the excavation of contaminated soil at <br /> the subject site. The report indicates that the source of <br /> contamination has been effectively removed. This point is clarified <br /> in the Regional Water Quality Control Board letter dated August 25, <br /> 1989, which states "the soil contamination at the subject site has <br /> been adequately cleaned up" (copy attached) . <br /> Concerning the need for further delineation of groundwater <br /> contamination, Unocal proposes to proceed with a phased approach in <br /> complying with this request. Specifically, we propose to do the <br /> following: <br /> PHASE I <br /> 1 . Perform a survey of all existing monitoring wells at the subject <br /> site. Collect water level readings and sample all wells which <br /> are not currently dry. <br />