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HOUSTON LABORATORY <br /> 8880 INTERCHANGE DRIVE <br /> O HOUSTON TEXAS 77054 <br /> Certificate of Analysis No . H9-9604098-07 PHONE(713) 660 0901 <br /> Alisto Engineering <br /> 1575 Treat Blvd P O # <br /> Walnut Creek, CA 94598 G620651 COC# 070706 <br /> ATTN- Brady Nagle DATE 04/12/96 <br /> PROJECT: BP Oil #11271 PROJECT NO: 10-085-09/003 <br /> SITE: Tracy, CA MATRIX: WATER <br /> SAMPLED BY: Alisto Engineering DATE SAMPLED: 03/29/96 <br /> SAMPLE ID: S-7 DATE RECEIVED: 04/02/96 <br /> ANALYTICAL DATA <br /> PARAMETER RESULTS DETECTION UNITS <br /> LIMIT <br /> MTBE 13 10 P gg/L <br /> Benzene 2 4 0 5 P gg/L <br /> Toluene ND 1 P �zg/L <br /> Ethylbenzene 59 1 P µg/L <br /> Total Xylene ND 1 P µg/L <br /> Surrogate Recovery <br /> 1, 4-Difluorobenzene 99 <br /> 4-Bromofluorobenzene 105 <br /> • METHOD 8020*** <br /> Analyzed by VHZ <br /> Date 04/09/96 <br /> Total Petroleum Hydrocarbons-Gasoline 0 55 0 05 P mg/L <br /> Surrogate Recovery <br /> 1 , 4-Difluorobenzene 95 <br /> 4 -Bromofluorobenzene 76 <br /> CA LUFT - Gasoline <br /> Analyzed by VHZ <br /> Date 04/09/96 11 06 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 />