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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650) 364-9233 <br /> q 404 N Wiget Lane Wainur Creek CA 94598 (9Z5)988-9600 FAX(925)98S-9673 <br /> Analytical 819 Straker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921-01oo <br /> 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, 5150137 1300 Sampled 07/15/98 <br />' 3468 Mt Diablo Blvd Ste B100 Sample Descript MW-6 Received 07/22/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 07/28/98 <br /> Attention Christa Marting Lab Number 9807D08-06 Reported 08J03198 <br />'CC Batch Number GC072898BTEX22A <br /> Instrument ID GCHP22 <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 2 5 N D <br /> Benzene 0 50 N D <br /> Toluene 0 50 N D <br /> Ethyl Benzene 0 50 N D <br /> Xylenes (Total) 050 N D <br /> Chromatogram Pattern <br /> Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 100 <br /> >nalytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP #1210 <br /> 1— 2, <br /> P <br /> and Herling <br /> ect Manager Page 6 <br />