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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> 6 X1,7 Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 1 <br /> EA Engineering Science&Tech Client Prol ID Exxon 7-3942/ 5153942 1300 Sampled 02/03/97 <br /> 01 A 68 Mt Diablo Blvd Ste B100 Sample Descript RW1 deceived 02/04/97 <br />�afayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 02/05/97 <br /> Attention Christa Marting Lab Number 9702110-14 Reported 02J12197 <br /> Uri;mPnt <br /> Batch Number GCO20497BTEX03B <br /> IIS GrHPm <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX and MTBE <br /> Vatyte Detection Limit Sample Results <br /> ug/L ug/L <br /> PPH as Gas 5000 16000 <br /> ethyl t-Butyl Ether 250 440 <br /> Benzene 50 390 <br /> Toluene 50 1900 <br /> thyl Benzene 50 680 <br /> ylenes (Total) 50 2000 <br /> Chromatogram Pattern Gas <br /> urrogates Control Limits % % Recovery <br /> rifluorotvluene 70 130 109 <br /> 1 <br /> 1 <br /> 4nalytes reported as N D were not present above the stated limit of detection <br /> LQUOIA ANALYTICAL - ELAP #1210 <br /> 1 � <br /> lett <br /> ect Manager Page 14 <br />