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BP RESEARCH Warrensville Research Center <br /> 4440 Warrensville Center Road <br /> Coco Cleveland,Ohio 44128-2837 <br /> Tel:(216)581-5600 <br /> Fax:(216)581-5621 <br /> June 6, 1990 <br /> State ofCalifornia RECEIVED <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road -Suite A J U N 1 5 1990 <br /> Sacramento, CA 95827-3098 ENVIRONMENTAL HEALTH <br /> PERMIT/SERVICES <br /> Attention: Pat Leary <br /> Re: Former Sohio Construction Company Stockton Assembly Site <br /> 2894 W.Monte Diablo, Stockton <br /> This is to follow up on a previous notification to you on January 23, 1990 and our <br /> conversation on March 5, 1990. At that time BP(formerly Sohio) was planning to investigate <br /> two locations on the property cited above. A potential buyer had collected soil samples at the <br /> site for engineering tests in June 1989 and also had them analyzed for organic chemical <br /> contamination. The results showed low levels of chloroform as reported in the January 23 <br /> letter. BP suspected that these were laboratory artifacts because the levels were near the <br /> detection limits and BP had never used halogenated chemicals at the site. Furthermore,the <br /> locations of the samples were not near each other, while the rest of the samples were clean. <br /> On April 5, 1990 two soil borings were advanced with a hollow-stem auger at locations <br /> immediately adjacent to the site of the previous borings, B-1 and B4, and samples taken, <br /> including samples at depths corresponding to the previously indicated chloroform readings. <br /> Enseco was instructed to analyze the samples using the same method as used previously,EPA <br /> method 8010. The results are described in the enclosed report by Enseco and show no <br /> contamination. As suspected,it is most likely that the earlier readings were indeed laboratory <br /> artifacts. <br /> If you have any further questions please contact me at(216)581-5659 or W. Gang Willis,BP <br /> Oil Pipeline HSEQ Administrator at(216)581-5659. <br /> G <br /> Gretchen C. Kuhn <br /> Project Leader-Geologist <br /> BP Research <br /> Environmental Technology <br /> Enclosure <br />