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' 680 Chesapeake Drrve Redwood City CA 94063 (650) 364 9600 FAX(650) 364 9233 <br /> Sequoia}"Y1 J q 404 N Wiger Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Smker 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) 791-1865 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 B100 Sample Descript MW-5 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 981OC43-05 _ _ _ _ Reported_10/30/98 <br /> C Batch Number GCi02298BTEX30A "__" <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 _ 81 <br /> Methyl t-Butyl Ether 25 75 <br /> Benzene 050 N D <br /> Toluene 050 4 1 <br /> Ethyl Benzene 0 50 N D <br /> Xylenes (Total) 0 50 N D <br /> Chromatogram Pattern GAS <br />' Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 99 <br /> I <br /> Analytes reported as N D were not present above the stated limit of detection <br /> tEQUOIA ANALYTICAL - ELAP #1210 <br /> 1 A&I—iL i <br /> Mei Mei Shin <br /> ct Manager <br /> Page 5 <br />