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HOUSTON LABORATQRY <br /> 8880 INTERCHANGE DRIVE <br /> HOUSTON,TEXAS 77054 <br /> PHONE(713)660.0901 • <br /> Certificate of Analysis No. H9-9604CO2-�04 <br /> Alisto Engineering <br /> 1575 Treat Blvd, P.O. # <br /> Walnut Creek, CA 94598 G620562 COC#073.586 <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 15 : 07 : 00 <br /> SAMPLE ID: S-4 DATE RECEIVED: 04/24/96 <br /> ANALYTICAL DATA <br /> PARAMETER RESULTS DETECTION UNITS <br /> LIMIT <br /> MTBE 29 10 P µg/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 µg/L <br /> Surrogate % Recovery <br /> 1, 4-Difluorobenzene 85 <br /> 4-Bromofluorobenzene 87 <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 62 <br /> 4-Bromofluorobenzene ill <br /> CA LUFT - Gasoline <br /> Analyzed by: VHZ <br /> Date : 05/05/96 09 :20 : 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 />