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HOUSTON LABORATORY <br /> 8880 INTERCHANGE DRIVE <br /> O HOUSTON, TEXAS 77054 <br /> Certificate of Analysis No. H9--9604CO3-06 Pi[ONE(713) 660-0901 <br /> Alisto Engineering <br /> 1575 Treat Blvd. P .O .# <br /> Walnut Creek, CA 94598 G620560 COC#071588 <br /> ATTN: Bill Howell DATE : 05/02/96 <br /> PROJECT: SP Oil #11192 PROJECT NO: 10-037-5-3 <br /> SITE: Stockton, CA MATRIX: WATER <br /> SAMPLED BY: Alisto Engineering DATE SAMPLED: 04/23/96 12 : 40 : 00 <br /> SAMPLE ID: B4594MW-7np DATE RECEIVED: 04/24/96 <br /> ANALYTICAL DATA <br /> PARAMETER RESULTS DETECTION UNITS <br /> LIMIT <br /> MTBE 150 10 P Ag/L <br /> Benzene ND 0 . 5 P /g/L <br /> Toluene ND 0 . 5 P µg/L <br /> Ethylbenzene ND 0 . 5 P µg/L <br /> Total Xylene ND 0 . 5 P µg/L <br /> Surrogate Recovery <br /> 1 , 4-Difluorobenzene 98 <br /> 4-Bromofluorobenzene 99 <br /> METHOD 8020*** <br /> Analyzed by: YN <br /> Date : 05/01/96 <br /> Total Petroleum Hydrocarbons-Gasoline ND 0 . 5 P mg/L <br /> Surrogate Recovery <br /> 1 , 4-Difluorobenzene 114 <br /> 4-Bromofluorobenzene 90 <br /> CA LUFT - Gasoline <br /> Analyzed by: LJ <br /> Date : 04/30/96 05 : 34 : 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 />