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HOUSTON LABORATORY <br /> 8880 INTERCHANGE DRIVE <br /> HOUSTON,TEXAS 77054a9z@ ' <br /> PHONE(713)660-0901 <br /> Certificate of Analysis No, H9-9801349-04 <br /> BP Oil Company <br /> 295 SW 41st St, Bldg 13 , Ste N P.O. # <br /> Renton, WA 98055 H177174, COC#055969 <br /> ATTN: Scott Hooton DATE: 01/19/98 <br /> PROJECT: #11193, N/A PROJECT NO: 10-136-7-2 <br /> SITE: Stockton, CA MATRIX: WATER <br /> SAMPLED BY: Alisto Engineering DATE SAMPLED: 01/07/98 <br /> SAMPLE ID: S-4 DATE RECEIVED: 01/10/98 <br /> ANALYTICAL DATA <br /> PARAMETER RESULTS DETECTION UNITS <br /> LIMIT <br /> MTBE 17 10 P j,g/L <br /> Benzene ND 0. 5 P lug/L <br /> Toluene ND 1. 0 P gg/L <br /> Ethylbenzene ND 1. 0 P µg/L <br /> Total Xylene ND 1. 0 P gg/L <br /> Surrogate % Recovery <br /> 1, 4-Difluorobenzene 97 <br /> 4-Bromofluorobenzene 100 <br /> Method 8020A*** <br /> Analyzed by: VHZ <br /> Date: 01/14/98 <br /> Gasoline Range Organics ND 0 . 05 P mg/L <br /> Surrogate % Recovery <br /> 1, 4-Difluorobenzene 73 <br /> 4--Bromofluorobenzene 107 <br /> California LUFT Manual for Gasoline <br /> Analyzed by: VHZ <br /> Date: 01/14/98 07 : 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 />