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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650) 364-9233 <br /> y 404 N Wiget lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (9 16)921-9600 fAX(916)921-oioo <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 7-3942, 5153942 1300 Sampled 11/18/98 <br /> 3408 Mt Diablo Blvd Ste 8100 Sample Descript MW9 Received 11/19/98 <br />' Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method B015Mod/8020 Analyzed 11/29/98 <br /> Attention Chnsta Marting Lab Number 9811 D70-08 Reported 12J03198 <br /> QC Batch Number GC112998BTEX02A - <br /> Instrument ID GCHPD2 <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 5o 310 <br /> Methyl t-Butyl Ether 25 18 <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 /> Unidentified HC C6-C12 <br />' Surrogates Control Limps % % Recovery <br /> Trifluorotoluene 70 130 141 Q <br /> Analytes rruorted as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP #1210 <br /> Mel Mei Shin <br /> Frect Manager <br /> Page 8 <br />