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Trace Analysis Laboratory, Inc. <br /> 3423 Investment Boulevard, #8 • Hayward California 94545 Telephone (510) 783-6960 <br /> Facsimile (510) 783-1512 <br /> _ LOG NUMBER: 1862 <br /> DATE SAMPLED: 03/04/92 <br /> DATE RECEIVED: 03/05/92 <br /> DATE ANALYZED: 03/17/92 <br /> DATE REPORTED. 03/19/92 <br /> CUSTOMER. Conoco, Inc. <br /> REQUESTER: Joe DeBiaso <br /> PROJECT No. 400511-M, Stockton <br /> Sam le T e. Air <br /> Method andI-1 Method Blank <br /> Concen- Reporting Concert- Reporting <br /> Constituent. Units tration Limit !ration Limit <br /> Modified OHS Method <br /> Total Petroleum Hydro- <br /> carbons as Gasoline mg/m3 9,400 1,500 NO 30 <br /> Modified EPA Method 8020 for <br /> Benzene mg/m3 NO 1.7 NO 0.034 <br /> Toluene mg/m3 75 5.0 NO 0. 10 <br /> Ethylbenzene mg/m3 60 2.0 ND 0.040 <br /> Xylenes mg/m3 1,000 11 ND 0.22 <br /> QC Summary_— <br /> Recovery: 108* <br /> RPD: 0.6 <br /> Concentrations reported as NO were not detected at or above the reporting limit. <br /> * The Recovery for air samples is based on the Laboratory Control Sample <br /> Louis W Dupuis ✓ <br /> Quality Assurance/Quality Control Manager . <br /> Founding Member of the Association of California Testing Laboratories A-8 <br />