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Sequoia 680 Chesapeake Drive Rcdv cx>d City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N W get Lane Walnut Creek CA 94598 (5 10) 988 9600 FAX(510)988 9673 <br /> Analytical 8195tnkerAvenue Suite a Sacramento CA 95834 (916) 921 9600 FAX(916) 921 Moo <br /> T <br /> EA Engineering Science &Tech Client Prod ID Exxon 7-3942, 5153942 1300 Sampled 03/03/98 <br /> 3468 Mt Diablo Blvd Ste 8100 Sample Descript MW7 Received 03/04/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 03/17/98 <br /> Attention Christa Martmg Lab Number 9803305-06 Reported 03131198 <br /> C Batch Number GC031798BTEX03A --- - - - -- <br /> strument ID GCHP3 <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 79 <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 /> Unidentified HC C6-C12 <br /> surrogates Control Limits % % Recovery <br /> nfluorotoluene 70 130 83 <br /> Anaiytes reported as N D were not present above the stated limit of detection <br /> 1EQUOIA ANALYTIC Lam- FLAP #1210 <br /> rnd Herling <br /> ct Manager Page 12 <br />