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Ms. Margaret Lagorio • - 2 - • 26 September 2006 v <br /> San Joaquin County Environmental Health Department <br /> ARCO must assess threats from potential soil vapor migration into surrounding structures on <br /> and near the Site, show declining concentration trends for all constituents, determine when <br /> Water Quality Objectives will be met, and determine the downgradient extent of the petroleum <br /> hydrocarbons in groundwater. Until this work is completed, the closure recommendation is <br /> inappropriate. <br /> If you have any questions regarding this requirement or need additional information, you may <br /> contact James Barton at (916) 464-4615 or Robert Busby at (916) 464-4736. <br /> APPROVED <br /> PAMELA C. CREEDON Author <br /> Executive Officer <br /> Central Valley Region Senior <br /> Enclosure (NFAR Checklist, Memo, and Map) <br /> cc: Ms. Frances McChesney, Esq., Office of the Chief Counsel, Sacramento <br /> Mr. Mark Owens, State Water Resources Control Board UST Cleanup Fund, <br /> Sacramento <br /> Mr. Don Pratt, Environmental Business Manager, Atlantic Richfield Company, <br /> P.O. Box 1257, San Ramon 94583 <br /> Mr. Gurpreet and Ms. Kuldeep Dhat, 501 S. Cherokee Avenue, Lodi 35240 <br /> Mr. Rusty Benkowsky, SECOR International, Inc., 3017 Kilgore Road, Suite 100, <br /> Rancho Cordova 95670 <br />