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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 /> 819 Straker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921-0100 <br /> �1,,,�► Analytical 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792 0342 <br /> EA Engineering Science &Tech Client Pro} ID Exxon 7-3942, 5153942 1300 _ Sampled 05/20/98 - <br /> 3468 Mt Diablo Blvd Ste 6100 Sample Descript RW4 Received 05/21/98 <br />'Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 06/02/98 <br /> Attention Chnsta Marting Lab Number 9805E41-15 Reported 06/10198 <br /> C Batch Number GC060298BTEX03A <br /> strument ID GCHP03 <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 7400 <br /> Methyl t-Butyl Ether 25 400 <br /> Benzene 5 0 450 <br /> Toluene 5 0 460 <br />,Ethyl Benzene 50 600 <br /> Xylenes (Total) 50 890 <br /> Chromatogram Pattern Gas <br /> Surrogates Control Limits % %' Recove Trifluorotoluene 70 130 99 <br /> 1 <br /> 1 <br /> 1 <br /> analytes reported as N D were not present above the stated limit of detection <br /> IEQUOIA ANALYTICAL - ELAP #1210 <br /> f'C,t1 <br /> d Herling <br /> Manager <br /> Page 30 <br />