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r Sequoia 660 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510)988 9600 FAX(510)988-9673 <br /> 1119 5tnker Avenue State 8 Sacramento CA 95834 (936)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 Prol ID Exxon 7-3942, 5153942 1300 Sampled 05/20/98 <br /> 3468 Mt Diablo Blvd Ste B100 Sample Descript IW1 Received 05/21/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 06/03/98 <br /> Attention Christa Marting _ Lab Number 9805E41-18 Reported 06/10198 <br /> rC Batch Number GCO60398BTEX21A <br /> nstrument ID GCHP21 <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 1000 2600 <br /> Methyl t-Butyl Ether 50 N D <br /> Benzene 10 17 <br /> Toluene 10 N D <br /> Ethyl Benzene 10 160 <br /> Xylenes (Total) 10 93 <br /> Chromatogram Pattern Gas <br /> Surrogates Control Limits % %' Recover Trifluorotoluene 70 130 84 <br /> 1 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> FEQUOIA ANALYTICAL - ELAP 01210 <br /> rd Herling <br /> j*ect Manager <br /> Page 36 <br />