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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 /> === s LOG NUMBER 3139 <br /> DATE SAMPLED- 04/07/93 <br /> -- DATE RECEIVED 04/07/93 <br /> t DATE ANALYZED 04/07/93 <br /> DATE REPORTED 04/21/93 <br />' CUSTOMER Conoco, Inc. <br />' REQUESTER Michael Cadreau of DuPont Environmental Remediation Services, Inc <br /> PROJECT. No 0511-31-5740-04, Stockton <br />' <br /> Sample Type. Vapor <br /> I. 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 7,700 200 ND 10 <br /> Modified EPA Method 8020 for. <br /> Benzene mg/m3 NO 6 6 ND 0 13 <br /> Toluene mg/m3 58 5 2 ND 0 10 <br /> Ethylbenzene mg/m3 110 6 9 ND 0 14 <br /> Xylenes mg/m3 1, 100 18 ND 0 36 <br />' QC Summary <br /> Recovery 68* <br />' % RPD- 7 9 <br /> Concentrations reported as ND were not detected at or above the reporting limit <br />' * The Recovery for vapor samples is based on the Laboratory Control Sample <br /> LOu15 W DuPuis <br /> Quality Assurance/Quality Control Manager <br /> 1 <br />' Founding Member of the Association of California Testing Laboratories <br />