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'L Sequoia 680 Chesapeake Drive Redwood City C4 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 /> Analytical 1195tnker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell`Blvd North Ste D Petaluma.CA 94954 (707) 792-1865 FAX(707)792-0342 <br /> EA Engineering Science &Tech Client Prol -ID E=xxon 7-3942, 5153942 1300 Sampled 05/20/98 <br /> 3468 Mt Diablo Blvd Ste B100 Sample Descript MW8 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 9805E41-07 _ Reported 06/10/98_ <br /> InC Batch Number GC0602988TEX17A <br /> strumentiD GCHP17 <br /> Total Purgeabie Petroleum Hydrocarbons (TPPH) with BTEX and MTBE <br />' Analyte Detection Limit Sample Results <br /> ug/L ug/L <br /> TPPH as Gas 2500 310Q0 <br />' Methyl t-Butyl Ether - 125 N D <br /> Benzene 25 73 <br /> Toluene 25 200 <br /> Ethyl Benzene 25 2000 <br /> Xylenes (Total) 25 4600 <br /> Chromatogram Pattern Gas <br />' Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 109 <br /> 1 <br /> I <br /> 1 <br /> Analytes reported as N D were not present above the stated limit of detection <br />�EQUOIA ANALYTICAL - ELAP #1210 <br /> and Herling <br /> ct Manager <br /> Page 14 <br /> I <br />