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HOUSTON LABORATORY <br /> 6880 INTERCHANGE DRIVE <br /> HOUSTON,TEXAS 77054 <br /> Z10i A ?HONE(713)660-0901 <br /> Certificate of Analysis No. H9-9607852-03 <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 #11193 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-3 DATE RECEIVED: 07/18/96 <br /> ANALYTICAL DATA <br /> PARAMETER RESULTS DETECTION UNITS <br /> LIMIT <br /> MTBE ND 10 P Ag/L <br /> Benzene ND 0 . 5 P Ag/L <br /> Toluene ND 1 P Ag/L <br /> Ethylbenzene ND 1 P Mcg/L <br /> Total Xylene ND 1 P ug/L <br /> Surrogate % Recovery <br /> 1, 4-Difluorobenzene 87 <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 117 <br /> 4-Bromofluorobenzene 73 <br /> CA LUFT - Gasoline <br /> Analyzed by: AA <br /> Date : 07/22/96 07 : 16 : 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 />