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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 (5 10) 988 9600 FAX(510)988 9673 <br /> Analytical 819 5trnker Avenue Su,te 8 Sacramento CA 95834 (9 16) 921 9600 FAX(916) 921 0100 <br /> EA Engineering Science&Tech Client Prol-ID Exxon 7-3942, 5153942 1300 Sampled 03/03/98 <br /> 68 Mt Diablo Blvd Ste B100 Sample Descript MW4 Received 03/04/98 <br /> fayette, CA 94549 Matrix LIQUID <br /> 4D <br /> Analysis Method 8015Mod/8020 Analyzed 03/16/98 <br /> _Attention Christa Marting Lab Number_ 9B03305-03 Repoded_03j31j98 <br />�C Batch Number GC031698BTEX03A <br /> strument ID GCHP3 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEK and MTBE <br /> 1nalyte Detection Limit Sample Results <br /> ug/L ug/L <br /> tTenzene <br /> PH as Gas 50 640 <br /> thyl t-Butyl Ether 25 13 <br /> 050 89 <br /> Toluene 050 080 <br /> E&Ethyl Benzene 050 058 <br /> ylenes (Total) 050 N D <br /> hromatogram Pattern Gas <br /> urrogates Control Limits % % Recovery <br /> IFrrfluorotoluene 70 130 100 <br /> inaiytes reported as N D were not present above the stated limit of detection <br />�QUOIA ANALYTICAL - ELAP #1210 <br /> rrd Herling <br /> ct Manager <br /> Page 6 <br />