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HOUSTONLABORATORX., <br /> 8890 INTERCHANGE DRIVE <br /> ® HOUSTON,TEXAS 77054 <br /> PHONE(713)660-0901 . <br /> Certificate of Analysis No. H9-9604CO2-06 <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 15 : 55 : 00 <br /> ' SAMPLE ID: S--6 DATE RECEIVED: 04/24/96 <br /> ANALYTICAL DATA <br /> PARAMETER RESULTS DETECTION UNITS <br /> LIMIT <br /> MTBE 27 10 P µg/L <br /> Benzene ND 0 . 5 P µg/L <br /> Toluene ND 1 P Ag/L <br /> Ethylbenzene ND 1 P µg/L <br /> Total Xylene ND 1 P µg/L <br /> Surrogate $ Recovery <br /> 1, 4-Difluorobenzene 89 <br /> 4-Bromofluorobenzene 84 <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 118 <br /> 4-Bromofluorobenzene 60 <br /> CA LUFT - Gasoline <br /> Analyzed by: VHZ <br /> Date : 05/05/96 10 : 12 : 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 />