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Trace Analysis Laboratory, Inc. q Telephone (510) 783-6960 <br /> 3423 Investment Boulevard #8 • Hayward California 94545 Facsimile (510) 783-1512 <br /> — _ LOG NUMBER- 2847 <br /> DATE SAMPLED 01/07/93 <br /> DATE RECEIVED 01/08/93 <br /> DATE ANALYZED 01/21/93 <br /> DATE REPORTED 01/22/93 <br /> CUSTOMER: Conoco, Inc. <br /> REQUESTER Michael Cadreau of DuPont Environmental Remediation Services, Inc ' <br /> PROJECT No 0511, Stockton <br /> Sample Type. Vapor <br /> I-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 8,800 780 ND 10 <br /> i-r <br /> Modified EPA Method 8020 for <br /> Benzene mg/m3 ND 10 ND 0.10 <br /> Toluene mg/m3 150 11 ND 0 10 <br /> Ethylbenzene mg/m3 130 13 ND 0 10 ' <br /> Xylenes mg/m3 1, 100 50 0 36 0 30 <br /> QC Summary. <br /> Recovery 112* ' <br /> RPD: 11 <br /> Concentrations reported as ND were not detected at or above the reporting limit , <br /> * The Recovery for vapor samples 7s based on the Laboratory Control Sample <br /> Louis W. DuPuis <br /> Quality Assurance/Quality Control Manager <br /> Founding Uemaep of ih©Assocrahon of California Testing E aboraforfes A-1 ' <br />