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. '1'race Analysis Laboratory,Inc. Telephone (415) 783-6960 <br /> 3423 Investment Boulevard, #8 Hayward, California 94545 Facsimile (415) 783-1512 <br /> .....- EOG NO. : 1124 <br /> DATE SAMPLED: 7/15/91 <br /> DATE RECEIVED: 7/18/91 <br /> DATE ANALYZED: 7/23/91 <br /> DATE REPORTED: 8/01/91 <br /> 1 <br /> CUSTOMER: Versar, Inc. <br />' REQUESTER: James Jensen <br />' PROJECT: No. 6264.308.02, PB Stockton <br />' Sam21 e Type: Ai <br /> #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 8.0 1 .9 ND 1 .9 <br /> Modified EPA Method 8020: <br /> Benzene mg/m3 ND 0.024 ND 0.024 <br /> i Toluene mg/m3 0.035 0.011 ND 0.011 <br />■ Xylenes mg/m3 0. 16 0.083 ND 0.083 <br />' Ethylbenzene mg/m3 0.088 0.026 ND 0.026 <br /> QC Summary: <br />' % Recovery: 78 <br /> % RPD: 1 .3 <br /> Concentrations reported as ND were not detected at or above the reporting limit. <br /> Louis W. DuPuis <br /> Quality Assurance/Quality Control Manager <br /> t <br /> Founding Member of the Association of California Testing laboratories <br />