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' Trace Analysis Laboratory, Inc. <br /> Telephone (415) 783-6960 <br /> 3423 Investment Boulevard, #8 • Hayward, California 94545 Facsimile (415) 783-1512 <br /> —� •» a LOG NUMBER: 1087 <br /> DATE SAMPLED: 7/3/91 <br /> DATE RECEIVED: 7/8/91 <br /> DATE ANALYZED: 7/11/81 <br /> DATE REPORTED: 7/18/91 <br />' CUSTOMER: Versar, Inc. <br /> REQUESTER: James Jensen <br /> PROJECT: No.6264.308.02, P.B. Stockton <br /> Sam a <br />' #1 u irate Method Blank <br /> Method and ca <br /> Reporting Concen- Reporting Concen- Reporting <br /> Constituent: Units' tratioL► _Lirnjt Nation _ Limit tr do limit <br /> Modified DHS Method: <br /> Total Petroleum Hydro- <br /> carbons as Gasoline mg/m3 11 7 12 7 ND 7 <br /> Modified EPA Method 8020: <br /> Isenzene mg/m3 NO 0.020 0.16 0.020 NO 0.020 <br /> Toluene mg/m3 0.072 0.020 0.10 0.020 ND 0.020 <br />' xylenes mg/m3 0. 18 0.060 0. 12 0.060 ND 0.060 <br /> Ethylbenzene mg/m3 0.026 0.020 0.051 0.020 ND 0.020 <br />' OC Summary: <br /> Recovery: 88* <br /> RPD: 4.8 <br /> Concentrations reported as NO were not detected at or above the reporting <br /> *The Recovery is based on a Laboratory Control Sample. A ting limit. <br />' Louis W. DuPu i s <br /> Quality Assurance/Quality Control Manager <br /> 6 <br /> Founding Member of the Association of California Testing Laboratories <br /> I <br />