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O <br /> Age <br /> Certificate of Analysis No. H9-9412875-04 <br /> Engineering Science, Inc. <br /> 290 Elwood Davis Rd <br /> Liverpool, NY 13088 <br /> ATTN: Martin Miller DATE: 12/28/94 <br /> PROJECT: Greyhound Stockton, Eng. Sci. PROJECT NO: 725218. 08969 <br /> SITE: Stockton, CA MATRIX: LIQUID <br /> SAMPLED BY: Engineering Science DATE SAMPLED: 12/19/94 <br /> SAMPLE ID: Trip Blank DATE RECEIVED: 12/20/94 <br /> ANALYTICAL DATA <br /> PARAMETER RESULTS DETECTION UNITS <br /> LIMIT <br /> BENZENE ND 0. 5 P gg/L+ <br /> TOLUENE ND 0. 5 P µCJ/L+ <br /> ETHYLBENZENE ND `� 0. 5 P µg/L <br /> TOTAL XYLENE ND 0. 5 P µg/L <br /> TOTAL VOLATILE AROMATIC HYDROCARBONS ND Ag/L <br /> Surrogate Recovery <br /> 1, 4-Difluorobenzene 90 <br /> 4-Bromofluorobenzene 102 <br /> METHOD 8020*** <br /> Analyzed by: YN <br /> Date: 12/24/94 <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. , - Pro]ec Manager <br />