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chevron <br /> 7� <br /> Chevron <br /> March 8, 1999 <br /> CAP <br /> Mr. Michael J. Infuma, Jr. Chevron Pipe Line Company <br /> San Joaquin County Public Health Services <br /> 4000 Executive Parkway,Suite 400 <br /> Environmental Health Division San Ramon,CA 94563 <br /> 304 E. Weber Street, Third Floor P.O.Box 6059 <br /> Stockton, CA 95202 San.Ramon,CA 94583-0759 <br /> Soil and GroundWater Investigation Report and Site Closure Request <br /> Dobler Property (San Joaquin Cou: nty.APN 209-270-26) <br /> 13588 West Grant Line Road <br /> Tracy, California <br /> Dear Mr. lnftjma: <br /> Please find enclosed the subject report prepared by Geomatrix Consultants, Inc. <br /> (Geomatrix), on behalf of Chevron Pipe Line Company's (CPL). The report documents <br /> the field investigation activities conducted at the subject site (per the Consistent <br /> Technical Approach approved by the Regional Water Quality Control Board in March <br /> 107), presents the analytical results from"Collected soil and groundwater samples, and <br /> compares the soil analytical results to U,S 11�Environmental Protection Agency Region <br /> IX's Preliminary Remediation Goals. Very limited petroleum hydrocarbon-affected soil <br /> was encountered in one borings (8.5.10 9.5 feet below ground surface). Detected <br /> constituents (pyrene and chrysene) Were several orders of magnitude below their <br /> respective residential PRGs, indicating that the presence of these constituents in soil at <br /> the site do not pose an unacceptable Brisk to future on-site residents. There were no <br /> detections of dissolved petroleum constituents in groundwater. <br /> .7 <br /> Based on the results presented in the report, CPL respectfully requests that no further <br /> action be required by San Joaquin County Public Health Services—Environmental Health <br /> Division. If you have any questions,or require additional information, please call <br /> Elizabeth Lu at (925)842-6855. <br /> Sincerely, <br /> K.L. Hower <br /> Project Manager <br /> California Site Remediation <br /> Attachment <br /> cc: Gary and Louie Dobler <br /> Patrick Riddle—Law Offices of Patrick Riddle <br /> Elizabeth Lu—CPL/Geomatrix (w/o attachment) <br /> Michael Keim—Geomatrix (w/o attachment) <br />