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I race Analysis Laboratory, Inc. <br /> Telephone (510) 783-6960 <br /> 3423 Investment Boulevard #8 • Hayward California 94545 Facsimile (510) 783-1512 <br /> April 27, 1992 <br /> Mr. Joe DeBiaso <br /> DuPont Environmental Remediation Services <br /> 7068 Koll Center Parkway, Suite 401 <br /> Pleasanton, California 94566 <br /> Dear Mr. DeBiaso- <br /> Trace Analysis Laboratory received one air sample on April 10, 1992 <br /> for your Project No 400511-M, Stockton (our custody log number 1991) . <br /> This sample was analyzed for Total Petroleum Hydrocarbons as Gasoline <br /> and Benzene, Toluene, Ethylbenzene and Xylenes Our analytical report <br /> and 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 /> *Sincerellours,kol <br /> cialist <br /> Enclosures <br /> Founding Member of the Association of California Testing Laboratories i4-1 <br />