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HOUSTON LABORATORY <br /> 8880 INTERCHANGE DRIVE <br /> HOUSTON,TEXAS 77054 <br /> n PHONE(713) 660.0901 <br /> Certificate of Analysis No. H9-9604CO3-12 <br /> Alisto Engineering <br /> 1575 Treat Blvd. P .O. # <br /> Walnut Creek, CA 94598 G620560 COC#0'71588 <br /> ATTN: Bill Howell DATE: 05/02/96 <br /> PROJECT: BP Oil #11192 PROJECT NO: 10-037-5-3 <br /> SITE: Stockton, CA MATRIX: WATER <br /> SAMPLED BY: Alisto Engineering DATE SAMPLED: 04/23/96 <br /> SAMPLE ID: B4594MW-3ppd DATE RECEIVED: 04/24/96 <br /> ANALYTICAL DATA <br /> PARAMETER RESULTS DETECTION UNITS <br /> LIMIT <br /> MTBE 240 10 P Ag/L <br /> Benzene 5 . 1 0 . 5 P Ag/L <br /> Toluene ND 0 . 5 P Ag/L <br /> Ethylbenzene 12 0 . 5 P µg/L <br /> Total Xylene 4 0 . 5 P µg/L <br /> Surrogate % Recovery <br /> 1, 4-Difluorobenzene 81 <br /> 4-Bromofluorobenzene 111 <br /> METHOD 8020*** <br /> Analyzed by: LJ <br /> Date : 04/30/96 <br /> Total Petroleum Hydrocarbons-Gasoline ND 0 . 5 P mg/L <br /> Surrogate Recovery <br /> 1 , 4-Difluorobenzene 91 <br /> 4-Bromofluorobenzene 121 <br /> CA LUFT - Gasoline <br /> Analyzed by: LJ <br /> Date : 04/30/96 09 : 05 : 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 />