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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988 9600 FAX(925)988 9673 <br /> X111 Analytical 819 Striker Avenue Suite 8 Sacramento 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 /> 1 <br /> EA Engineering Science &Tech Client Prod ID Exxon 7-0137, 5150137 1300 Sampled 07/15/98 <br />' 3468 Mt Diablo Blvd Ste B100 Sample Descript TB Received 07/22/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 07/28/98 <br /> Attention Chnsta Martmg Lab Number 9807D08-10 Reported 08103/98 <br />'QC Batch Number GC072898BTEX02A <br /> Instrument ID GCHP02 <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 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 />' Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 g7 <br /> analytes reported as N D were not present above the stated limit of detection <br /> ISEQUOIA ANALYTICAL - ELAP #1210 <br /> Pand Herling <br /> ect Manager Page 1D <br />