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r, HOUSTON LABORATORY <br /> 8880 INTERCHANGE DRIVE <br /> 7 HOUSTON,TEXAS 77054 <br /> n PHONE(713)680-D901 <br /> Certificate of Analysis No. H9-9604CO2-01 <br /> Alisto Engineering <br /> 1575 Treat Blvd. P .O. # <br /> Walnut Creek, CA 94598 G620562 COC#071586 <br /> ATTN: . Bill Howell DATE : 05/07/96 <br /> PROJECT: BP Oil #11193 PROJECT NO: 10-136-5-4 <br /> SITE: Stockton, CA MATRIX: WATER <br /> SAMPLED BY: Alisto Engineering DATE SAMPLED: 04/22/96 13 :45 : 00 <br /> SAMPLE ID: S-1 DATE RECEIVED: 04/24/96 <br /> ANALYTICAL DATA <br /> PARAMETER RESULTS DETECTION UNITS <br /> LIMIT <br /> MTBE 58 10 P ag/L <br /> Benzene ND 0 . 5 P µg/L <br /> Toluene ND 1 P µg/L <br /> Ethylbenzene ND 1 P µg/L <br /> Total Xylene ND 1 P Ag/L <br /> Surrogate Recovery <br /> 1, 4-Difluorobenzene 81 <br /> 4-Bromofluorobenzene 100 <br /> • METHOD 8020*** <br /> Analyzed by: LJ <br /> Date : 05/04/96 <br /> Total Petroleum Hydrocarbons-Gasoline ND 0 . 05 P mg/L <br /> Surrogate % Recovery <br /> 1, 4--Difluorobenzene 110 <br /> 4-Bromofluorobenzene 58 <br /> CA LUFT - Gasoline <br /> Analyzed by: LJ <br /> Date : 05/04/96 04 : 14 : 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 /> • <br /> QUALITY ASSURANCE: These analyses are performed in accordance <br /> with EPA guidelines for quality assurance . <br /> SPL California License # 1903 <br />