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HOUSTON LABORATORY <br /> 8880 INTERCHANGE DRIVE <br /> iaw <br /> O HOUSTON, TEXAS 77054 <br /> Certificate of Analysis No. H9-9604CO2-03 PHONE{713}660-0801 <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 14 : 50 : 00 <br /> SAMPLE ID: S-3 DATE RECEIVED: 04/24/96 <br /> ANALYTICAL DATA <br /> PARAMETER RESULTS DETECTION UNITS <br /> LIMIT <br /> MTBE ND 10 P ug/L <br /> Benzene ND 0 . 5 P ug/L <br /> Toluene ND 1 P ug/L <br /> Ethylbenzene ND 1 P ug/L <br /> Total Xylene ND 1 P ttg/L <br /> Surrogate Recovery <br /> 1,4-Difluorobenzene 86 <br /> 4-Bromofluorobenzene 79 <br /> METHOD 8020*** <br /> Analyzed by: VHZ <br /> Date : 05/05/96 <br /> Total Petroleum Hydrocarbons-Gasoline ND 0 . 05 P mg/L <br /> Surrogate Recovery <br /> 1,4-Difluorobenzene 113 <br /> 4-Bromofluorobenzene 58 <br /> CA LUFT - Gasoline <br /> Analyzed by: VHZ <br /> Date : 05/05/96 08 : 05 : 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 />