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HOUSTON LABORATORY <br /> 8880 INTERCHANGE DRIVE <br /> O HOUSTON,TEXAS 77054 <br /> ertificate of Analysis No. 59-9703631-02 PHONE(713)6600901 <br /> i <br /> BP Oil Company <br /> 295 SW 41st St, Bldg 13 , Ste N P.O.# <br /> Renton, WA 98055 G797415 , COC#077107 <br /> ATTN: Scott Hooton DATE: 03/21/97 <br /> PROJECT: BP Oil #11193 PROJECT NO: 10-136-6-3 <br /> SITE: Stockton, CA. MATRIX: WATER <br /> SAMPLED BY: Alisto Engineering DATE SAMPLED: 03/11/97 <br /> SAMPLE ID: S-2 DATE RECEIVED: 03/13/97 <br /> ANALYTICAL DATA <br /> PARAMETER RESULTS DETECTION UNITS <br /> LIMIT <br /> MTBE ND 10 P µg/L <br /> Benzene 0 . 52 0 . 5 P µg/L <br /> Toluene ND 1 . 0 P µg/L <br /> Ethylbenzene ND 1 . 0 P µg/L <br /> Total Xylene ND 1 . 0 P µg/L <br /> Surrogate Recovery <br /> 1, 4-Difluorobenzene 100 <br /> 4-Bromofluorobenzene 97 <br /> Method 8020A*** <br /> Analyzed by: WK <br /> Date : 03/16/97 <br /> Total Petroleum Hydrocarbons-Gasoline ND 0 . 05 P mg/L <br /> I <br /> Surrogate Recovery <br /> 1, 4-Difluorobenzene 87 <br /> 4-Bromofluorobenzene 93 <br /> California LUFT Manual <br /> Analyzed by: JN <br /> Date : 03/16/97 12 : 04 : 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 /> • <br /> QUALITY ASSURANCE: These analyses are performed in accordance <br /> with EPA guidelines for quality assurance . <br /> SPL California License # 1903 <br />