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California Re conal Water Quality Control Board : <br /> Central Valley Region <br /> Robert Schneider'ChairF <br /> Winston H.Hickox s It t —` ' .4 "r o Gray Davis <br /> Secretary for Sacramento Main Office Governor <br /> Environmental Internet Address: http://www.swrcb.ca.gov/—rwgcb5 <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Phone(916)255-3000•FAX(916)255-3015 <br /> 31 May 2001 <br /> Mr. Robert Mihalovich <br /> —Chevron.Environm.ental_Management-Company-- — -- - - - - <br /> 6001 Bollinger Canyon Road <br /> P. O. Box 6012 <br /> San Ramon, CA 94583-0712 <br /> ADDITIONAL GROUNDWATER SAMPLING REPORT, CHEVRON PIPE LINE COMPANY, <br /> MANSFIELD PROPERTY, TRACY, SAN JOAQUIN COUNTY <br /> We have reviewed Geomatrix's 17 January 2001 Additional Groundwater Sampling Report for the <br /> Mansfield property site in Tracy. The report presents results of additional groundwater sampling at four <br /> locations to determine the presence of dissolved-phase total petroleum hydrocarbons (TPH) in <br /> ,groundwater beyond the areas of TPH-affected soil. , <br /> The report states that none of the four sampling locations contained TPH characterized as diesel, <br /> analyzed with and without silica gel cleanup. Based on these nondetectable results, the report <br /> recommends preparation of a closure request in accordance with Appendix B [No Further Action <br /> Requests (NFA)] of the Tri-Regional Board Staff Recommendations for PreliminaryInvestigation and g <br /> Evaluation of Underground Tank Sites. We concur with the report's finding and recommendation. In <br /> addition to providing information specified in Appendix B, Chevron also should include the information <br /> —provided-in the prototype April 2000-Site-Closure Request;–By 29 June 2001,--please submit.a schedule __. <br /> to complete the NFA request. <br />` If you have any questions, you may call me at (916) 255-3398 or e-mail at isorenp@rb5s.swrcb.ca.gov. <br /> _� r• PHILIP . ISORENA <br /> Associate Engineer <br /> cc: CMr...Michael Infurna, San Joaquin County.Public Health,Services,Stockton <br /> Ms. Darlene Mansfield, Mansfield Property, Tracy <br /> Ms.Penny Fottrell, Chevron Environmental Management Company, San Ramon <br /> California Environmental Protection Agency <br /> �a Recycled Paper <br /> The energy challenge facing.California is real.Every Californian needs to take immediate action to reduce energy consumption. <br /> v_�i;cr.,f c;mntr wnvc vnu can do to reduce demand and cut your energy costs,see our Website at http://www.swrcb.ca-gov/rwgcb5. <br />