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Chevron <br /> GSE �� ;, Chevron <br /> FEB - .9 �U U 1 Chevron Environmental Management <br /> February 7, 2001 Company <br /> ENVIRONMEN l EALTH 6001 Bollinger Canyon Road <br /> PERMIT/SERVICES P.0.Box 6012 <br /> San Ramon,CA 94583-0712 <br /> Ms. Wendy Cohen Robert D.Mihalovich <br /> California Regional Water Quality`Control Board, Pipeline Program Manager <br /> Central Valley Region Phone:(925)842-1341 <br /> 3443 Routier Road, Suite A Facsimile:(925)842-0213 <br /> Sacramento, California 95827-3003 <br /> Soil and Groundwater Investigation Reports <br /> Pombo Property (APN 232-170-07) <br /> 1755 West 11`h Street <br /> Tracy, California <br /> Dear Ms. Cohen: <br /> Chevron Environmental Management Company (Chevron) has.performed soil and groundwater <br /> investigation activities and a human health screening evaluation for the subject property. <br /> Enclosed.are two documents which summarize these activities"for your review. Based on the <br /> results of the investigations performed to date, delineation of.petroleum-affected soil has been <br /> completed; however delineation of petroleum-affected groundwater will'.require additional field <br /> activities. Due to the residential nature of the downgradient areas of the subject property, <br /> Chevron requests the involvement of your staff to facilitate future investigation activities. <br /> In its April 27, 2000 letter(enclosed), the Department of Toxic Substance Control concurred <br /> with the human health screening evaluation that the residual levels of petroleum-related <br /> hydrocarbons in the soils at the site are below.levels that would constitute an unacceptable risk to <br /> human health and the environment. <br /> In order to facilitate your staff's review of the subject document, Chevron herein approves the <br /> use of the Bruns Property cost 'recovery account for your staff's review time for this site. <br /> Thank you for your consideration. If you have any questions or require additional information, <br /> please call Penny Fottrell at(925) 842-1343 or me at(925) 8424341. <br /> Smc . <br /> Robert D. Mihalovich <br /> Pipeline Program Manager <br /> Enclosures January 2000 and December 2000 Geomatrix Consultants reports <br /> April 27, 2000 DTSC letter <br /> f <br /> �� F a k, <br />