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1 Sequoia 6B0 Chesapeake Drive Redwood City CA 94063 (650)364 9600 FAX(650) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Straker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)971-0100 <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 11/18/98 <br /> 3468 Mt Diablo Blvd Ste B100 Sample Descript UVB-MW2 Received 11/19/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 11/27/98 <br /> Attention Chnsta Marting Lab Number 9811D70-15 Reported 12JO3198 <br />' QC Batch Number GC1 12798BTEX17A <br /> Instrument ID GCHP17 <br /> Total Purgeable Petroleum Hydrocarbons (TPNH) with BTEX and MTBE <br /> Analyte Detection Limit Sample Results <br /> ug/L ug/L <br /> TPPH as Gas 500 760 <br /> Methyl t-Butyl Ether 25 N D <br /> Benzene so 230 <br /> Toluene 5 0 80 <br />' Ethyl Benzene 5 0 25 <br /> Xylenes (Total) 5 0 23 <br /> Chromatogram Pattern GAS <br /> Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 84 <br /> 1 <br /> 1 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP #1210 <br /> et Met Shin <br /> ect Manager <br /> Page 15 <br />