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10/02/92 09 00 %T415 783 1512 TRACE ANALYSES Z 003 <br /> Trace Analysis Laboratory,Inc. <br /> Telephone (510) 783-6960 <br /> 3423 tnvastment Boulevard, N$ • Hayward California 94545 Facsimile (510) 783-1512 <br /> LOG NUMBER: 2480 <br /> DATE SAMPLED: 0010/92 <br /> DATE RECEIVED: 09/11/92 <br /> DATE ANALYZED: 09y16/92 <br /> DATE REPORTED: 09/22/92 <br /> CUSTOMER: Conoco, Inc. <br /> REQUESTER: Michael Cadreau I <br /> PROJECT: No. 0511 , Stockton j <br /> a <br /> Sample Type: Vapor <br /> I -I I fluent Method Blank <br /> Method and Concen- keporting Concen- Reporting <br /> C s tration Limit tratton Limit <br /> Modified OHS Method- <br /> Total Petroleum hydro- <br /> carbons as Gasoline mg/m3 36,000 1,900 NO 10 <br /> *odified LPA Method 8020 for: J <br /> Benzene mg/m3 ND 79 ND 0 10 <br /> Toluene mg/m3 790 i 68 ND 0. 10 <br /> Ethylbenzene mg/m3 600 1 83 ND 0. 10 <br /> Xylenes mg/m3 4, 100 220 4.36 0.30 <br /> QC Summary,_ <br /> Recovery: 92* <br /> % RPD- 20 <br /> Concentrations reported as ND were not detracted at or above the reporting limit <br /> * The Recovery For vapor samples is based onithe Laboratory Control Sample <br /> i r <br /> Louis W. DuPuis <br /> Quality Assurance/Quality Control Manager <br /> 1 <br /> A-5 <br />