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HOUSTON LABORATORY <br /> 8880 INTERCHANGE DRIVE <br /> HOUSTON. TEXAS 77054 <br /> OA PHONE(713)660-0901 <br /> Certificate of Analysis No. H9-9604CO3-02 0 <br /> Alisto Engineering <br /> 1575 Treat Blvd. P.O. # <br /> Walnut Creek, CA 94598 G620560 COC#071588 <br /> ATTN: Bill Howell DATE : 05/02/96 <br /> PROJECT: BP Oil #11.192 PROJECT NO: 10-037-5-3 <br /> SITE: Stockton, CA MATRIX: WATER <br /> SAMPLED BY: Alisto Engineering DATE SAMPLED: 04/23/96 11 :22 : 00 <br /> SAMPLE ID: B4594MW-4np DATE RECEIVED: 04/24/96 <br /> ANALYTICAL DATA <br /> PARAMETER RESULTS DETECTION UNITS <br /> LIMIT <br /> MTBE 14 10 P gg/L <br /> Benzene ND 0 . 5 P ug/L <br /> Toluene ND 0 . 5 P Ag/L <br /> Ethylbenzene ND 0 . 5 P Ag/L <br /> Total Xylene ND 0 . 5 P Ag/L <br /> Surrogate Recovery <br /> 1, 4-Difluorobenzene 83 <br /> 4-Bromofluorobenzene 97 <br /> METHOD 8020*** <br /> Analyzed by: LJ <br /> Date : 04/30/96 <br /> Total Petroleum Hydrocarbons-Gasoline ND 0 . 5 P mg/L <br /> Surrogate %�Recovery <br /> 1 , 4-Difluorobenzene 98 <br /> 4-Bromofluorobenzene 86 <br /> CA LUFT - Gasoline <br /> Analyzed by: LJ <br /> Date : 04/30/96 03 :47 : 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 />