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' <br /> Sequoia <br /> � 7 O�a 680 Chesapeake Drive Redwood Ctry CA 94063 (650) 364 9600 FAX(650) 364 9233 <br /> q U 404 N 44iger Lane Walnut Creek CA 94598 (925)9a8 9600 FAX(925)988 9673 <br /> 1119 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D P'eralum&CA 94954 (707)792-1865 FAX(707)792 0342 <br /> EA Engineering Science &Tech Client Prot ID Exxon 7-3942, 5153942 1300 Sampled 08/19/98 <br /> 3468 Mt Diablo Blvd Ste 8100 Sample Descrlpt MW11 Received 08/20/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 08/25/98 <br /> Attention Chnsta Martmg Lab Number 9808C97-10 Reported 09/04/98 <br /> QC Batch Number GCO82598BTEX30A <br /> Instrument ID GCHP30 <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 50 N D <br /> Methyl t-Butyl Ether 25 N D <br /> Benzene 050 <br /> ND <br /> Toluene 050 N D <br /> Ethyl Benzene 050 N D <br /> Xylenes (Total) 050 N D <br /> Chromatogram Pattern <br /> Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 96 <br /> I� <br /> I <br /> i <br /> I <br /> I <br /> Analytes reported as N D were not present above the stated limit of detection <br /> ISEQUOIA ANALYTICAL - ELAP #1210 <br /> I �A J" <br /> d Heriing <br /> ,*d <br /> ct Manager <br /> Page 2 <br />