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HOUSTON LABORATORY <br /> 8880 INTERCHANGE DRIVE <br /> O HOUSTON, TEXAS 77054 <br /> 4tificate of Analysis No. H9-9807329-06 PHONE (713)660-0901 <br /> Zan 4MA BP Oil Company P .O .# <br /> 295 SW 41st St, Bldg 13 , Ste N <br /> Renton, WA 98055 H339131, COC#098640 <br /> ATTN: Scott Hooton DATE : 10/06/98 <br /> PROJECT: #11192 , PROJECT NO: 10-037-7-2 <br /> SITE: Stockton, CA MATRIX: WATER <br /> SAMPLED BY: Alisto Engineering DATE SAMPLED: 07/07/98 <br /> SAMPLE ID: S-6 DATE RECEIVED: 07/09/98 <br /> ANALYTICAL DATA <br /> PARAMETER RESULTS DETECTION UNITS <br /> LIMIT <br /> MTBE 8300 500 P ug/L <br /> Benzene ND 0 . 5 P ug/L <br /> Toluene ND 1 . 0 P ug/L <br /> Ethylbenzene ND 1 . 0 P ug/L <br /> Total Xylene 1 . 1 1 . 0 P ug/L <br /> Surrogate %- Recovery <br /> 1, 4-Difluorobenzene 83 <br /> 4-Bromofluorobenzene 107 <br /> Method 8020A*** <br /> Analyzed by: HS <br /> Date : 07/19/98 <br /> Gasoline Range Organics 6 . 6 0 . 05 P mg/L <br /> Surrogate Recovery <br /> 1, 4-Difluorobenzene 167MI <br /> 4-Bromofluorobenzene 97 <br /> California LUFT Manual for Gasoline <br /> Analyzed by: LJ/ <br /> Date : 07/16/98 03 : 17 : 00 <br /> (P) - Practical Quantitation Limit ND - Not detected. <br /> 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 /> C i iZ'3 <br /> QUALITY ASSURANCE: These analyses are performed in accordance <br /> with EPA guidelines for quality assurance. <br /> SPL California License # 1903 <br />