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' Sequoia 680 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 /> D <br /> Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)9Z1 0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792 1865 FAX(707)792 034Z <br /> 6 <br /> EA Engineering Science &Tech Client Proj 1D Exxon 7-3942, 5153942 1300 Sampled 05/20/98 <br /> 3468 Mt Diablo Blvd Ste 8100 Sample Descript P1 Received 05/21/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 06/03/98 <br /> Attention Chnsta Martfng Lab Number 9805E41-16 Reported 06/10/98 <br /> C 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 500 1600 <br /> Methyl t-Butyl Ether 25 N D <br /> Benzene 50 20 <br /> Toluene 50 N D <br />' Ethyl Benzene 50 110 <br /> Xylenes (Total) 50 19 <br /> Chromatogram Pattern Gas <br /> Surrogates Control Limits% % Recovery <br /> Tnfluorotoluene 70 130 82 <br /> I <br /> Anafytes reported as N D were not present above the stated limit of detection <br /> LEGUOIA ANALYTICAL - ELAP #1210 <br /> and Herling <br /> sect Manager <br /> Page 32 <br /> 1 <br />