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Unocal Corporation <br /> Diversified Businesses <br /> 2000 Crow Canyon Place, uite 400 <br /> San Ramon,California 94583 <br /> Telephone(510)867-0760 <br /> Facsimile(510)277-2309 <br /> UNOCAL9 <br /> -� <br /> February 26, 1997 rn <br /> � -t= <br /> = <br /> Mary Meays <br /> San Joaquin County <br /> West Region Environmental Health Division rnfn <br /> Environmental Remediation Services P.O. Box 388 cjn J <br /> 304 E. Weber Ave.,Third Floor <br /> Stockton, CA. 95201-0388 <br /> UNOCAL SERVICE STATION# 0187 <br /> 437 East Miner Ave. <br /> Stockton, Ca. <br /> Dear Ms. Meays: <br /> This is in response to your letter dated January 30, 1997, for the referenced site. The letter states <br /> that the previously approved feasibility study must be initiated and a CAP submitted. It is <br /> Unocal's technical opinion that the implementation of this plan is no longer warranted and a less <br /> aggressive approach toward achieving a low risk closure should be pursued. <br /> The soil contamination remaining at this site is the result of a very old release. The most <br /> significant amount of benzene found was in boring UL-45.5' at a concentration of 140 ppm. The <br /> soil does not pose a threat to human health, safety, or the environment. <br /> Groundwater has been monitored and sampled at this site since 1994. The data strongly indicates <br /> the plume is not migrating and that levels of contaminants are remaining constant or decreasing. <br /> Based on the knowledge obtained from the Lawrence Livermore Lab study, it is highly unlikely <br /> that a groundwater plume emanating from this site would migrate any significant distance. Unocal <br /> will conduct a survey to determine if there are any wells within a 1000 foot radius of the site. <br /> Based on the results,the location of an additional well, if needed,will be determined. Once plume <br /> delineation is complete; Unocal will submit the site for closure as a low risk groundwater case. <br /> If you have any questions or concerns, please call me at(510) 277-2334. <br /> S' rely, <br /> juLf-(i 40%,j- <br /> Robert A. Boust <br /> cc: Greg Gurss <br />