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Trace Analysis Laboratory, Inc. Telephone (510) 763-6960 <br /> 3423 Investment Boulevard, #8 • Hayward California 94545 Facsimile (510) 783-1512 ' <br /> -- — <br /> LOG NUMBER 4273 <br /> DATE SAMPLED. 04/06/94 <br /> DATE RECEIVED 04/06/94 <br /> DATE ANALYZED. 04/08/94 <br /> DATE REPORTED. 04/20/94 , <br /> CUSTOMER. Conoco, Inc <br /> REQUESTER: Lenard Long of Sunriver Engineering and Construction, Inc. ' <br /> PROJECT. No. 93036, Stockton, 4325 East Washington Street ' <br /> Sample Type. Va or <br /> I-1 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 2,000 1 ,000 ND 10 <br /> Modified EPA Method 8020 for: <br /> Benzene mg/m3 ND 10 ND 0 10 <br /> Toluene mg/m3 ND 10 ND 0 10 <br /> Ethylbenzene mg/m3 45 10 ND 0 10 <br /> Xylenes mg/m3 470 30 ND 0 45 <br /> QC Summary. _ <br /> Recovery- 102* ' <br /> RPD 6.7 <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 <br /> Quality Assurance/Quality Control Manager <br /> Fiintdnrq Mofnhoof the Astioc+<3tron ()( C tWc r , `rsliog Llborator e5 1 <br />