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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)36A-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510)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 Krol ID Exxon 7-3942, 5153942 1300 Sampled 05/20/98 <br /> 3468 Mt Diablo Blvd Ste B100 Sample Descript RW1 Received 05/21/98 <br />' Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 06/02/98 <br /> Attention Christa Marting Lab Number 9805E41-13 _ Reported 06110198 <br /> inC Batch Number GCO60298BTEX03A <br /> strument ID GCHP03 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX and MTBE <br />'Analyte Detection Limit Sample Results <br /> ug/L ug/L <br /> iTPPH as Gas 2000 13000 <br /> Methyl t-Butyl Ether 100 760 <br /> Benzene 20 310 <br /> Toluene 20 1500 <br /> iEthyl Benzene 20 670 <br /> Xylenes (Total) 20 1800 <br /> Chromatogram Pattern Gas <br /> Surrogates Control Limits <br /> % Recovery <br /> Trifluorotoluene 70 130 83 <br /> i <br /> i <br /> i <br /> Analytes reported as N D were not present above the stated limit of deteotlon <br /> 1EQUOIA ANALYTICAL - ELAP #1210 <br /> i <br /> rd Herling <br /> P'ect Manager <br /> Page 25 <br /> 1 � <br />