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' <br /> Sequoia <br /> '4 T O�� 680 Chesapeake Drive Redwood Cary CA 94063 (650) 364 9600 FAX(650) 364 9233 <br /> J j l.i 404 N Wiget cane Walnut Creek CA 94598 (925)988 9600 FAX(925) 988 9673 <br /> Analytical 819 Scnker Avenue Suite 8 Sacramenro CA 95834 (916)921 9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707) 792 1865 FAX(707) 792 0342 <br /> EA Engineering Science &Tech Client Prof ID Exxon 7-3942, 5153942 1300 Sampled 08/19/98 <br />' 3468 Mt Diablo Blvd Ste B100 Sample Descrlpt MW4 Received 08/20/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 08/27/98 <br /> Attention Chrlsta Marting Lab Number 9808C95-03 Reported 09f04/98 <br /> t <br /> C Batch Number GC082798BTEX30A <br /> strument 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 50 680 <br /> Methyl t-Butyl Ether 25 N D <br /> Benzene 050 1 1 <br /> Toluene 050 16 <br /> Ethyl Benzene 050 43 <br /> Xylenes (Total) N D <br /> Chromatogram 050 Pattern GAS <br /> Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 112 <br /> Snalytes reported as N D were not present above the stated limit of detection <br />�EQUOIA ANALYTICAL ELAP #1210 <br /> ii� Harling <br />�r t Manager Page 6 <br />