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a ■ Sequoia680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650) 364 9233 <br /> 404 N Wget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> EA Engineering Science&Tech Client Prof ID Exxon 7-3942, 51539 42 1300 Sampled 08/26/97 <br /> 3468 Mt Diablo Blvd Ste B100 Sample Descript MW9 Received 08/27/97 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 08/30/97 <br /> Attention Chnsta Marting _ Lab Number 9708E45-06 Reported 09J04/97 <br />� <br /> C Batch Number GCO83097BTEX06A '- - " --- <br /> nstrument ID GCHP06 <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 200 1100 <br /> Methyl t-Butyl Ether 10 150 <br /> Benzene 2 0 64 <br /> Toluene 20 N D <br /> Ethyl Benzene 20 N D <br /> Xylenes (Total) N D <br /> Chromatogram 20 Pattern Gas <br />�Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 101 <br /> analytes reported as N D were not present above the stated limit of detection <br /> EQUOIA ANALYTICAL - ELAP 41210 <br /> ti Herling <br /> Jr Manager <br /> Page 4 <br />