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'['raze Arialysis R ilrorafory,lite Telephone(415)783-6960 <br /> 3423 Investment Boulevard,k8 • l-laywarrl,California 94545 Facsimile(415)783.1512 <br /> June 21, 1991 <br /> Joe DeBiaso <br /> DuPont Environmental Remediation Services, Inc. <br /> 7068 Koll Center Parkway, Suite 401 <br /> Pleasanton, CA 94566 <br /> Dear Mr. Dw84aso: <br /> Trace Analysis Laboratory received one air sample an June 7, 1991, <br /> for your Conoco Project No. 400511-M, Stockton (our custody Log <br /> Number 9972). <br /> This sample was analyzed for Total Petroleum Hydrocarbons as Gasoline, <br /> ' Benzene, Toluene, X;rlenes and Ethylbenzene. 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 /> - <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 yours, <br /> Louis Dupuis <br /> QA/QC Manager <br /> Enclosures <br /> Founding Membor of the Association of California Testing Laboratories <br />