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HOUSTONLABORATQRY <br /> 8880 INTERCHANGE DRIVE <br /> O HOUSTON,TEXAS 77054 <br /> Certificate of Analysis No. H9-9604CO2-08 PHONE (713)660-0901 • <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 <br /> SAMPLE ID: S-8 DATE RECEIVED: 04/24/96 <br /> ANALYTICAL DATA <br /> PARAMETER RESULTS DETECTION UNITS <br /> LIMIT <br /> MTBE 2100 250 P gg/L <br /> Benzene 130 0 . 5 P j.g/L <br /> Toluene 3 1 P jug/L <br /> Ethylbenzene 34 1 P j.g/L <br /> Total Xylene 11 1 P µg/L <br /> Surrogate $ Recovery <br /> 1, 4-Difluorobenzene 88 <br /> 4-Bromofluorobenzene 84 <br /> METHOD 8020*** • <br /> Analyzed by: VHZ <br /> Date : 05/05/96 <br /> Total Petroleum Hydrocarbons-Gasoline 0 . 49 0 . 05 P mg/L <br /> Surrogate Recovery <br /> 1, 4-Difluorobenzene 112 <br /> 4-Bromofluorobenzene 92 <br /> CA LUFT - Gasoline <br /> Analyzed by: VHZ <br /> Date : 05/05/96 11 : 05 : 00 <br /> (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 />