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680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650) 364 9233 <br /> Sequoia 404 N wget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br />' 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792 1865 FAX(707)792-0342 <br /> EA Engineering Science &Tech Client Prol ID Exxon 7-0137, 5150137 1300 _ Sampled 10/14/98 - <br /> 3468 Mt Diablo Blvd Ste 6100 Sample Descript TB Received 10/16/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 10/22/98 <br /> Attention Christa Marting Lab Number 981OC43-09 Reported-1 <br /> 0J30J98- - <br /> J-2c Batch Number G6102298BTEX30A <br /> Instrument ID GCHP30 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX and MTBE <br />' Analyte Detection Limit Sample Results <br /> ug/L ug/L <br />' TPPH as Gas 50 N D <br /> Methyl t-Butyl Ether 25 N D <br /> Benzene 050 N D <br /> Toluene 050 N D <br />' Ethyl Benzene 050 N D <br /> Xylenes (Total) 050 N D <br /> Chromatogram Pattern <br /> Surrogates Control Limits % % Recove <br /> Trifluorotoluene 70 130 94 <br /> 6 <br /> 1 <br /> Analytes reported as N D were not present above the stated limit of detection <br />`SEQUOIA ANALYTICAL - ELAP #1210 <br /> 1 AL'7:::Z'6- <br /> Mei Mei Shin <br /> Pr ct Manager Pae 9 <br /> 9 <br /> I <br />