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Chevron <br /> %- 0- Chevron <br /> 99 OCT I k,2 Chevron Environmental Management <br /> September 28, 1999 Company <br /> 6001 Bollinger Canyon Road,Room K2284 <br /> P.0.Box 6012 <br /> San Ramon,CA 94583.0712 <br /> Mr. Philip Isorena, P.E. <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road, Suite A <br /> Sacramento, California 95827-3003 <br /> �•�� �"'" <br /> Addendum to Site Status Report 'L <br /> Mansfield Property <br /> 13880 West Grant Line Road <br /> Tracy, California <br /> Dear Mr. Isorena: <br /> Please find enclosed the subject report for your files. This report was prepared by Geomatrix <br /> Consultants, Inc. on behalf of Chevron Environmental Management Company and documents the <br /> additional field work conducted at the site, as approved by the California Regional Water Quality <br /> Control Board (RWQCB) in both its July 30, 1999 and September 3, 1999 letters. In its <br /> September 3, 1999 letter,the RWQCB requested an explanation as to how the extent of impacted <br /> soil surrounding MB-1 was established. The extent of the impacted soil around MB-1 was <br /> estimated based on data from four sampling locations surrounding MB-1 (B-7, B-13, B-14, and <br /> B-16), and knowledge from neighboring sites,that groundwater in the area flows to the north. <br /> If you have any questions or require additional information, please call Elizabeth Lu at(925)842- <br /> 1343. <br /> Sincerely, <br /> K. L. Hower <br /> Project Manager <br /> Enclosure <br /> cc: Richard and Darlene Mansfield <br /> Patrick Riddle—Law Offices of Patrick D. Riddle <br /> CMichael Infurna, Jf:—San Joaquin-County Public Health_S_ervkces <br /> I <br />