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' 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650) 364-9233 <br /> Sequoia 404 N Wiget 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 Prot ID Exxon 7-0137,-515C137 1300 Sampled 10/14/98 <br /> 3468 Mt Diablo Blvd Ste B100 Sample Descript VEW 2 Received 10/15/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 10/21/98 <br /> Attention Christa Marting _ Lab Number 981 OC43-08 Reported 10J30J98_ <br /> QC Batch Number G6102198BTEX17A <br /> Instrument ID GCHP17 <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 25 190 <br /> Benzene 0 50 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 % % Recovery <br /> Trifluorotoluene 70 130 107 <br /> 6 <br /> I <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP #1210 <br /> 1 nL--&' <br /> 16ect <br /> Mel Shin <br /> Manager <br /> Page S <br />