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Trace Analysis Laboratory, Inc-. Telephone (510) 783-69F0 <br /> 3473 Investment Boulevard, #8 • Hayward, California 94545 Facsimile (510) 783-1512 <br /> LOG NUMBER. 3040 <br /> DATE SAMPLED- 03/05/93 <br /> DATE RECEIVED: 03/08/93 <br /> DATE ANALYZED 03/18/93 <br /> DATE REPORTED 03/22/93 ' <br /> CUSTOMER- Conoco, Inc. <br /> REQUESTER. Michael Cadreau of DuPont Environmental Remediation Services, Inc., <br /> PROJECT- No. 0511-31-5740-04, Stockton ' <br /> Sample Type: Vapor <br /> 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 1 ,800 130 ND 10 <br /> Modified EPA Method 8020 for <br /> Benzene mg/m3 ND 5 7 ND 0 10 <br /> Toluene mg/m3 28 5 3 ND 0 10 <br /> Ethylbenzene mg/m3 40 6.2 0. 13 0. 10 ' <br /> Xylenes mg/m3 240 15 ND 0 30 <br /> C Summar ' <br /> -- - y <br /> % Recovery- 124* ' <br /> % RPD 2 6 <br /> Concentrations reported as ND were not detected at or above the reporting limrt , <br /> * The Recovery for vapor samples is based on the Laboratory Control Sample <br /> Louis w DuPuis ' <br /> Quality Assurance/Quality Control Manager <br /> 1 ' <br /> Fourdfng Member of thW Asst c ation of Calftofma Testing Laboralor+as A-5 ' <br />