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HOUSTON LABORATORY <br /> 8880 INTERCHANGE DRIVE <br /> HOUSTON, TEXAS 77054 <br /> Certificate of Analysis No. H9-9709B70-01. PHONE(713)660-0901 <br /> BP Oil Company <br /> 295 SW 41st St, Bldg 13 , Ste N P.O. # <br /> Renton, WA 98055 H177174 , COC#085817 <br /> ATTN: Scott Hooton DATE : 10/06/97 <br /> PROJECT: #11193 , NA PROJECT NO: 10-136-7-1 <br /> SITE: Stockton, CA MATRIX: WATER <br /> SAMPLED BY: Alisto Engineering DATE SAMPLED: 09/22/97 <br /> SAMPLE ID: S-1 DATE RECEIVED: 09/25/97 <br /> ANALYTICAL DATA <br /> PARAMETER RESULTS DETECTION UNITS <br /> LIMIT <br /> MTBE ND 10 P gg/L <br /> Benzene ND 0 . 5 P gg/L <br /> Toluene ND 1 . 0 P gg/L <br /> Ethylbenzene ND 1 . 0 P gg/L <br /> Total. Xylene ND 1 . 0 P gg/L <br /> Surrogate Recovery <br /> 1, 4-Difluorobenzene 100 <br /> 4--Bromofluorobenzene 100 <br /> Method 8020A*** <br /> Analyzed by: fab <br /> Date : 10/02/97 <br /> Gasoline Range Organics ND 0 . 05 P mg/L <br /> Surrogate % Recovery <br /> 1, 4-Difluorobenzene 100 <br /> 4-Bromofluorobenzene 93 <br /> California LUFT Manual for Gasoline <br /> Analyzed by: fab <br /> Date : 10/02/97 10 : 26 : 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 />