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' ( ■ ' Sequoia680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 H <br /> 404 Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 92t 9600 FAX(916) 921 0100 <br /> 6 <br /> EA Engineering Science &Tech Client Prol ID� Exxon 7-3942, 5153942 1300 Sampled 03/03/98 <br /> 3468 Mt Diablo Blvd Ste B100 Sample Descript MW12 Received 03/04/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 03/16/98 <br /> Attention Christa Marting Lab Number 9803306-11 _ _ Reported 03j31 j98 <br /> Unstrument <br /> C Batch Number GC031698BTEX21 <br /> ID GCHP21 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX and MTBE <br /> I <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 0 50 N D <br />' Xylenes (Total) 0 50 N D <br /> Chromatogram Pattern <br />' Surrogates Control Limits % % Recovery <br /> Trlfluorotoluene 70 130 102 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> 1EQUOlAANALLYTlC,ftL - ELAP #1210 <br /> P,rtd HerlingcManager page 4 <br />