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HOUSTON LABORATORY <br /> 8880 INTERCHANGE DRIVE <br /> ® HOUSTON TEXAS 77054 <br /> lie PHONE(713)660-0901 <br /> Certificate of Analysis No. H9-9505980-06 <br /> EZ Serve Inc . <br /> 2550 North Loop West, #600 <br /> Houston, TX 77292 <br /> ATTN Brian Cobb DATE 07/06/95 <br /> PROJECT: EZ-Serve #100966 PROJECT NO: 1566-04 <br /> SITE: Stockton, CA MATRIX: WATER <br /> SAMPLED BY: Brown & Caldwell DATE SAMPLED: 06/21/95 13 20 00 <br /> SAMPLE ID: 100966 MW-4 DATE RECEIVED: 06/23/95 <br /> ANALYTICAL DATA <br /> PARAMETER RESULTS DETECTION UNITS <br /> LIMIT <br /> BENZENE ND 0 5 P Ag/L <br /> TOLUENE ND 0 5 P gg/L <br /> ETHYLBENZENE ND 0 5 P µg/L <br /> TOTAL XYLENE ND 0 5 P Ag/L <br /> TOTAL VOLATILE AROMATIC HYDROCARBONS ND µg/L <br /> Surrogate Recovery <br /> 1, 4-Difluorobenzene 97 <br /> 4-Bromofluorobenzene 94 <br />. METHOD 8020*** <br /> Analyzed by VHZ <br /> Date 07/01/95 <br /> Petroleum Hydrocarbons - Gasoline ND 50 P µg/L <br /> Surrogate % Recovery <br /> 1 , 4-Difluorobenzene 89 <br /> 4-Bromofluorobenzene 120 <br /> Modified 8015 - Gasoline <br /> Analyzed by VHZ <br /> Date 07/01/95 <br /> ND - Not detected. (P) - Practical Quantitation Limit <br /> Notes *Ref . Methods for Chemical Analysis of Water and Wastes, 1983 , EPA <br /> **Ref : Standard Methods for Examination of Water & wastewater, 17th 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 /> SPL, Inc . , - Project Man ger <br />