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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 /> LOG NUMBER 3229 <br /> DATE SAMPLED. 05/05/93 <br /> DATE RECEIVED 05/07/93 <br />' DATE ANALYZED 05/12/93 <br /> DATE REPORTED 05/21/93 <br />' CUSTOMER Conoco, Inc <br />' REQUESTER• Michael Cadreau of DuPont Environmental Remediation Services, Inc <br /> PROJECT No 0511-31-5740-04, Stockton <br /> Sample Type- Vapor <br />' INC Influent Method Blank <br /> Method and Concen- Reporting Concen- Reporting <br /> Constituent Units tration Limit tration Limit <br />' Modified DHS Method: <br /> Total Petroleum Hydro- <br /> carbons as Gasoline mg/m3 1,800 480 ND 10 <br /> Modified EPA Method 8020 for <br /> Benzene mg/m3 NO 12 NO 0 23 <br /> Toluene mg/m3 45 4 4 ND 0 10 <br />' Ethylbenzene mg/m3 63 26 ND 0 52 <br /> Xylenes mg/m3 350 14 ND 0 30 <br />' OC Summary <br /> Recovery 78* <br />' % RPD 0 19 <br />' Concentrations reported as NO were not detected at or above the reporting limit <br /> This sample was analyzed 3 days beyond the 4-day holding time for this analysis <br />' * The Recovery for vapor samples is based on the Laboratory Control Sample <br /> Louis W DUPu1S <br /> Quality Assurance/Quality Control Manager <br /> Founding Member of the Association of California Testing Laboratories <br />