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HOUSTON LABORATORY <br /> 8880 INTERCHANGE DRIVE <br /> 'P HOUSTON.TEXAS 77054 <br /> PHONE(713)660-0901 <br /> Certificate of Analysis No. H9-9607852-01 <br /> BP Oil Company <br /> 295 SW 41st St, Bldg 13 , Ste N P.O .# <br /> Renton, WA 98055 G797415, COC#082679 <br /> ATTN: Scott Hooton DATE : 07/29/96 <br /> PROJECT: BP Oil 411193 PROJECT NO: 10-136-6-1 <br /> SITE: Stockton, CA MATRIX: WATER <br /> SAMPLED BY: Alisto Engineering DATE SAMPLED: 07/12/96 <br /> SAMPLE ID: S-1 DATE RECEIVED: 07/18/96 <br /> ANALYTICAL DATA <br /> PARAMETER RESULTS DETECTION UNITS <br /> LIMIT <br /> MTBE 62 10 P �ig/L <br /> Benzene ND 0 . 5 P Ag/L <br /> Toluene ND 1 P gg/L <br /> Ethylbenzene ND 1 P µg/L <br /> Total Xylene ND 1 p Ag/L <br /> Surrogate % Recovery <br /> 1, 4-Difluorobenzene 90 <br /> 4-Bromofluorobenzene 87 <br /> METHOD 8020*** <br /> Analyzed by: AA <br /> Date : 07/22/96 <br /> Total Petroleum Hydrocarbons-Gasoline ND 0 . 05 P mg/L <br /> Surrogate % Recovery <br /> 1, 4-Difluorobenzene 107 <br /> 4-Bromofluorobenzene 67 <br /> CA LUFT - Gasoline <br /> Analyzed by: AA <br /> Date : 07/22/96 06 : 17 : 00 <br /> (P) - Practical Quantitation Limit ND - Not detected. <br /> Notes : *Ref : Methods for Chemical Analysis of Water and Wastes, 1983 , EPA <br /> **Ref : Standard Methods for Examination of Water & Wastewater, 18th ed. <br /> ***Ref : Test Methods for Evaluating Solid Waste, EPA SW846, 3rd Ed. <br /> QUALITY ASSURANCE: These analyses are performed in accordance <br /> with EPA guidelines for quality assurance . <br /> SPL California License # 1903 <br />