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HOUSTON LABORATORY <br /> 8880 INTERCHANGE DRIVE <br /> 0 HOUSTON,TEXAS 77054 <br /> PHONE (713)660-0801 <br /> Certificate of Analysis No. H9-9807221-02 <br /> BP Oil Company <br /> 295 SW 41st St , Bldg 13 , Ste N P.O.# <br /> Renton, WA 98055 H177174 , COC#098638 <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: 07/02/98 <br /> SAMPLE ID: S-2 DATE RECEIVED: 07/07/98 <br /> ANALYTICAL DATA <br /> PARAMETER RESULTS DETECTION UNITS <br /> LIMIT <br /> MTBE 130 10 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 ND 1 . 0 P ug/L <br /> Surrogate Recovery <br /> 1, 4-Difluorobenzene 77 <br /> 4-Bromofluorobenzene 50 <br /> Method 8020A*** <br /> Analyzed by: AA/ <br /> Date : 07/09/98 <br /> Gasoline Range Organics 0 . 060 0 . 05 P mg/L <br /> Surrogate % Recovery <br /> 1, 4-Difluorobenzene 77 <br /> 4-Bromofluorobenzene 50 <br /> California LUFT Manual for Gasoline <br /> Analyzed by: AA/ <br /> Date : 07/09/98 12 : 59 : 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 4 1903 <br />