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i <br /> Department of Toxic Substances Control <br /> Edwin F. Lowry, Director <br /> 8800 Cal Center Drive, Suite 350 <br /> Gray Davis <br /> JcFL- v E <br /> Sacramento, California 95826 <br /> Winston H. Hickox �i i.', ,����'� <br /> Agency Secretary "- D Governor <br /> California Environmental <br /> Protection Agency OCT 1 o 2001 <br /> October 9, 2001 ENVIROW,:ENT HEALTH <br /> PERUHTIGERVICES <br /> Mr. Robert Mihalovich <br /> Chevron Environmental Management Company <br /> 6001 Bollinger Canyon Road <br /> San Ramon, California 94583 <br /> 'REViE"vV Or "REPORT OF ADDITIONAL*SOIL AND GROU`NDWATER`iNV"EST GATION"., <br /> RIDGEWAY (FORMERLY BURNS) PROPERTY <br /> 1 <br /> Dear Mr. Mihalovich: <br /> The Department of Toxic Substances Control (DTSC) completed its review of the subject <br /> report for the Ridgeway (former Burns) Property, prepared by Geomatrix Consultants and <br /> submitted by Chevron. The purpose of the additional soil and groundwater investigation was <br /> conducted to,satisfy recent data requirements for the California Regional Water Quality <br /> Control Board, Central Valley Region. <br /> The subject report was reviewed by DTSC's David L. Berry, Ph.D., Senior Toxicologist (see <br /> internal memorandum dated October 2, 2001). DTSC concurs that the analytical data <br /> supporting this investigation appears adequate in both quantity and quality. The residual <br /> levels of petroleum-related constituents in the soils at the site are below levels that would <br /> constitute an unacceptable risk to human health and the environment which is consistent with <br /> our previous review of the property (see enclosed memo dated March 14, 2000). As with any <br /> real property, if previously unidentified contamination is discovered at the Site, additional <br /> assessment, and/or remediation may be required. <br /> If you have any questions regarding this matter, please contact Mr. Jerry Lile at <br /> s _ (916) 2 ilr, _ <br /> 55 37 T4 C. h u' cIECtFO(1 c r ail address at ;L�le wdf�C:Ga. w <br /> Sincerely, <br /> Megan Cambridge, Chief <br /> Expedited Remedial Action.Program Unit <br /> Enclosures F ' - _. <br /> cc's: See-next page: =^ <br /> The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. <br /> For a list of simple ways you can reduce demand and cut your energy costs, see our Web-site at www.dtsc.ca.gov. <br /> 8 Printed on Recycled Paper <br />