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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wigec Lane Walnut Creek CA 94598 (510) 988 9600 FAX(Sio)988 9673 <br /> 6 41%0 Analytical 819 Sinker Avenue SLite 8 Sacramento Ca 95834 (916) 921 9600 FAx(916)921 0100 <br /> EAEngineeringScience&Tech L Client Pral !D Exxon 7-3942/5i5394213Q7 Sampled 04/18/96 <br /> 3468 Mt Diablo Blvd Ste B100 Sample Descript 3942MW9NP Received 04/19/96 µ <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 04/24/96 = <br />- Attention Maria Gu_ensler Lab Number 9604E22-10 Reported 05/10/96 <br /> kC Batch Number GC042496BTEX20A <br /> nstrument ID GCHP20 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX and MTBE <br /> 1 Analyte Detection Limit Sample Results <br /> ug/L sig/L <br /> TPPH as Gas .: 500 .: .: ..: 1900 <br /> Methyl t-Butyl Ether 25 75 <br /> Benzene .. .. .. 50 .. .. 470 <br /> Toluene 50 N D <br /> Ethyl Benzene .; so . . .. . . .. 47 <br /> Xylenes (Total) so 18 <br /> Chromatogram Pattern .. ... . . .. ... . .. . Gas <br /> Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 88 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> ISE I ALYTICAL - ELAP #1210 <br /> in Follett <br /> project Manager Page 10 <br />