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k - <br />HOUSTON LABORATORY <br />8880 INTERCHANGE DRIVE <br />HOUSTON TEXAS 77054 <br />. ® PHONE (713) 680-0901 <br />' Certificate of Analysis No. H9-9512258-04 <br />Engineering Science, Inc. <br />290 Elwood Davis Rd <br />Liverpool, NY 13088 <br />ATTN: Martin Miller DATE: 12/15/95 <br />PROJECT: Greyhound. Stockton PROJECT NO: 727211.8969 <br />SITE: Stockton, Ca. MATRIX: LIQUID <br />SAMPLED BY: Provided by SPL DATE SAMPLED: 11/28/95 <br />SAMPLE ID: Trip Blank DATE RECEIVED: 12/06/95 <br />ANALYTICAL DATA <br />PARAMETER <br />RESULTS <br />DETECTION <br />UNITS <br />- <br />LIMIT <br />BENZENE <br />ND <br />0.5 P <br />hg/L <br />µg/L <br />TOLUENE <br />ND <br />ND <br />0.5 P <br />0.5 P <br />pg/L <br />ETHYLBENZENE <br />ND <br />0.5 P <br />µg/L <br />TOTAL XYLENE <br />µg/L <br />TOTAL VOLATILE AROMATIC HYDROCARBONS <br />ND <br />Surrogate % Recovery <br />1,4-Difluorobenzene <br />99 <br />4-Bromofluorobenzene <br />90 <br />METHOD 8020*** <br />Analyzed by: VHZ <br />Date: 12/10/95 <br />ND - Not detected. (P) - <br />Practical <br />Quantitation <br />Limit <br />Notes: *Ref: Methods for Chemical Analysis of <br />Water and <br />Wastes, 1983, <br />EPA <br />**Ref: Standard Methods for Examination <br />of Water <br />& Wastewater, <br />18th ed. <br />***Ref: Test Methods for Evaluating Solid Waste, EPA <br />SW846, 3rd <br />Ed. <br />• <br />QUALITY ASSURANCE: These analyses are performed in accordance <br />with EPA guidelines for quality assurance. <br />SPL California License # 1903 <br />