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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 /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)92I-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 Prod ID - Exxon 7-3942,-51-53942 1300Sampled 65/20/-9-8---- <br /> 14611 Mt Diablo Blvd Ste 6100 Sample Descnpt MW9 - 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 9805E41-08 Reported 06/10/98_y _ <br />�OC Batch Number GC060298BTEX21A <br /> Instrument 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 50 . . . . 220 <br /> Methyl t-Butyl Ether 25 22 <br /> Benzene - --- 0.50 35 <br /> Toluene 050 ND <br /> Ethyl Benzene 050 N D <br /> Xylenes (Total) 050 N D <br /> Chromatogram Pattern <br /> Gas & Unidentified HC .. C6-C8 <br />' Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 88 <br /> 1 <br /> 1 <br /> Anatytes reported as N 0 were not present above the stated limit of detection <br /> PEQUOIA ANALYTICAL - ELAP #1210 <br /> Fand Herling <br /> ect Manager Page 16 <br />