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HOUSTON LABORATORY <br /> 8880 INTERCHANGE DRIVE <br /> O HOUSTON,TEXAS 77054 <br /> Certificate of Analysis No. H9-9709B70-04 PHONE(713)660-0401. <br /> BP Oil Company <br /> 295 SW 41st St , Bldg 13 , Ste N P .O. # <br /> Renton, WA 98055 H177174 , COC#085817 <br /> ATTN: Scott Hooton DATE : 10/06/97 <br /> PROJECT: #11193 , NA PROJECT NO: 10-136-7-1 <br /> SITE: Stockton, CA MATRIX: WATER <br /> SAMPLED BY: Alisto Engineering ' DATE SAMPLED: 09/22/97 <br /> SAMPLE ID: S-4 DATE RECEIVED: 09/25/97 <br /> ANALYTICAL DATA <br /> PARAMETER RESULTS DETECTION UNITS <br /> LIMIT <br /> MTBE 2100 100 P kg/L <br /> Benzene 730 5 . 0 P t.g/L <br /> Toluene 10 1 . 0 P tg/L <br /> Ethylbenzene 7 . 9 1 . 0 P Ag/L <br /> Total Xylene 74 1 . 0 P ttg/L <br /> Surrogate % Recovery <br /> 1, 4-Difluorobenzene 107 <br /> 4-Bromofluorobenzene 93 <br /> Method 8020A*** • <br /> Analyzed by: AA <br /> Date : 10/03/97 <br /> Gasoline Range Organics 2 . 4 0 . 05 P mg/L <br /> Surrogate % Recovery <br /> 1, 4-Difluorobenzene 157MI <br /> 4-Bromofluorobenzene 83 <br /> California LUFT Manual for Gasoline <br /> Analyzed by: fab <br /> Date : 10/03/97 02 : 54 : 00 <br /> (P) - Practical Quantitation Limit MI - Matrix interference . <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 /> • <br /> QUALITY ASSURANCE: These analyses are performed in accordance <br /> with EPA guidelines for quality assurance. <br /> SPL California License # 1903 <br />