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HOUSTON LABORATORY <br /> 8880 INTERCHANGE DRIVE <br /> ® HOUSTON,TEXAS 77054 <br /> ertificate of Analysis No. 119-9807221-04 PHONE(713)660-0901 <br /> BP Oil Company <br /> 295 SW 41st St, Bldg 13 , Ste N <br /> Renton, WA 98055 P .O. # <br /> H177174 , COC4098638 <br /> ATTN: Scott Hooton DATE : 07/15/98 <br /> PROJECT: ##11193 ,N/A PROJECT NO: 10-136--7-3 <br /> SITE: Stockton, CA. MATRIX: WATER <br /> SAMPLED BY: Alisto Engineering DATE SAMPLED: 07/01/98 <br /> SAMPLE ID: S-4 DATE RECEIVED: 07/07/98 <br /> ANALYTICAL DATA <br /> PARAMETER RESULTS DETECTION UNITS <br /> MTBE LIMIT <br /> 4900 250 P ug/L <br /> Benzene 22 0 . 5 P ug/L <br /> Toluene ND 1 . 0 P ug/L <br /> Ethylbenzene 2 . 1 1 . 0 P ug/L <br /> Total Xylene ND 1 . 0 P ug/L <br /> Surrogate % Recovery <br /> 1, 4-Difluorobenzene 85 <br /> 4-Bromofluorobenzene 99 <br /> Method 8020A*** <br /> Analyzed by: LJ <br /> Date : 07/14/98 0 <br /> Gasoline Range Organics 1 . 2 0 . 05 P mg/L <br /> Surrogate %, Recovery <br /> 1, 4-Difluorobenzene 73 <br /> 4-Bromofluorobenzene 43MI <br /> California LUFT Manual for Gasoline <br /> Analyzed by: AA/ <br /> Date : 07/09/98 01 : 52 : 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 /> QUALITY ASSURANCE: These analyses are performed in accordance <br /> with EPA guidelines for quality assurance . <br /> SPL California License # 1903 <br />