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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: 2426 <br /> DATE SAMPLED' 08/20/92 <br /> _— DATE RECEIVED: 08/21/92 <br /> DATE ANALYZED: 09/03/92 <br /> DATE REPORTED: 09/04/92 <br /> CUSTOMER. Conoco, Inc <br /> REQUESTER Michael Cadreau <br /> PROJECT. No. 0511, Stockton <br /> Sample Type. Vapor <br /> I-1 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 8,200 1,200 ND 10 <br /> dod i f i ed EPA Method 8020 for <br /> enzene mg/m3 ND 47 ND 0 10 <br /> Toluene mg/m3 160 55 ND 0. 10 <br /> Ethylbenzene mg/m3 110 64 ND 0 10 <br /> Xylenes mg/m3 880 170 ND 0.30 <br /> QC Summary. <br /> Recovery: 82* <br /> % RPD: 27 <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 /> Z _ <br /> - <br /> Louis W. DuPuis <br /> Quality Assurance/Quality Control Manager <br /> Founding Member of the Association of California Testing Laboratories p-3 <br />