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Trace Analysis Laboratory,Inc. Telephone (510) 783-6960 <br /> 3423 Investment Boulevard, #8 • Hayward California 94545 Facsimile (510) 783-1512 <br /> February 24, 1992 <br /> Mr. Joe DeBiaso <br /> DuPont Environmental Remediation Services, Inc. <br /> 7058 Koll Center Parkway, Suite 401 <br /> Pleasanton, California 94566 <br /> Dear Mr. DeBiaso: <br /> Trace Analysis Laboratory received one air sample on February 7, 1992 <br /> for your Conoco Project No. 400511-M, Stockton (our custody log number <br /> 1773) . <br /> This sample was analyzed for Total Petroleum Hydrocarbons as Gasoline <br /> and Benzene, Toluene, Ethylbenzene and Xylenes. Our analytical report and <br /> the completed chain of custody form are enclosed for your review <br /> Trace Analysis Laboratory is certified under the California Environ- <br /> mental Laboratory Accreditation Program. Our certification number is <br /> 1199 <br /> If you should have any questions or require additional information, <br /> please call me. <br /> Sincerely your , <br /> Jnifer ekol <br /> P sect Specialist <br /> Enclosures <br /> Founding Member of the Association of California Testing Laboratories A-4 <br />