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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 (5tO)988-9600 FAX(510)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (9t6)921 9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707) 792-1865 FAX(707)792-0342 <br /> EA Engineering Science &Tech Client Prod ID Exxon 7-3942, 5153942 1300 Sampled 05/20/98 <br /> 3468 Mt Diablo Blvd Ste B100 Sample Descript Trip Blank Received 05/21/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method B015Mod/8020 Analyzed 06/01/98 <br /> Attention Chnsta Marting Lab Number 9805E43-24 Reported 06f10198 <br /> rnC Batch Number GC060198BTEX02A <br /> strument 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 0 50 N D <br /> Toluene 050 N D <br />' Ethyl Benzene 0 50 N D <br /> Xylenes (Total) 050 N D <br /> Chromatogram Pattern <br /> Surrogates Control Limits % %' Recover Tnfluorotoluene 70 130 74 <br /> 1 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> tEOU01A ANALYTICAL - ELAP 41210 <br /> rd Herling <br /> ect Manager Page 9 <br />