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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- 2303 <br /> — ' DATE SAMPLED: 07/10/92 <br /> DATE RECEIVED: 07/10/92 <br /> DATE ANALYZED: 07/22/92 <br /> DATE REPORTED: 07/24/92 <br /> CUSTOMER: Conoco, Inc <br /> REQUESTER- Mike Cadreau <br /> PROJECT No. 0511 , Stockton <br /> Sample Type _ Vapor T <br /> 1-1, 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 1,400 290 ND 10 <br /> dified EPA Method 8020 for: <br /> nzene mg/m3 NO 3 2 ND 0. 10 <br /> Toluene mg/m3 59 3.5 ND 0 10 <br /> Ethylbenzene mg/m3 21 3 9 ND 0.10 <br /> Xylenes mg/m3 180 10 ND 0.30 <br /> QC Summary• , <br /> Recovery: 83* <br /> RPD: 26 <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 /> Louis W DuPuis T <br /> Quality Assurance/Quality Control Manager <br /> Founding Member of the Association of California Testing Laboratories A-1 <br />