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HOUSTON LABORATORY <br /> 8880 INTERCHANGE DRIVE <br /> HOUSTON,TEXAS 77054 <br /> 0 PHONE(713)660-0301 <br /> ertificate of An No. H9-911911-04 0 <br /> BP Oil Company <br /> 295 SW 41st St, Bldg 13 , Ste N P.O.# <br /> Renton, WA 98055 G797415 COC#084393 <br /> ATTN: Scott Hooton DATE: 11/25/96 <br /> PROJECT: BP Oil #11193 PROJECT NO: 10-136-6-2 <br /> SITE: Stocton, CA MATRIX: WATER <br /> SAMPLED BY: Alisto Engineering DATE SAMPLED: 11/14/96 <br /> SAMPLE ID: S-4 DATE RECEIVED: 11/16/96 <br /> ANALYTICAL DATA <br /> PARAMETER RESULTS DETECTION UNITS <br /> LIMIT <br /> MTBE ND 10 P µg/L <br /> Benzene ND 0 . 5 P µg/L <br /> Toluene ND 1 . 0 P jug/L <br /> Ethylbenzene ND 1 . 0 P [tg/L <br /> Total Xylene ND 1 . 0 P ug/L <br /> Surrogate % Recovery <br /> 1, 4-Difluorobenzene 103 <br /> 4-Bromofluorobenzene 97 <br /> METHOD 8020*** <br /> Analyzed by: RL <br /> Date : 11/22/96 <br /> Total Petroleum Hydrocarbons-Gasoline ND 0 . 05 P mg/L <br /> Surrogate % Recovery <br /> 1, 4-Difluorobenzene 90 <br /> 4-Bromofluorobenzene 97 <br /> CA LUFT - Gasoline <br /> Analyzed by: RL <br /> Date: 11/22/96 06 : 10 : 00 <br /> ND - Not detected. (P) - Practical Quantitation Limit <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 />