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' 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364 9233 <br /> Sequoia J 404 N Wiget Lane Walnut Creek.CA 94598 (510)988-9600 FAX(510)988-9673 <br /> Analytical r Avenue Suite B <br /> 819 Str=keSacramento CA 95834 (916}923-9600 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 Prol ID" - Exxon 7-3942, 5153942 1300 Sampled 05/20/98 <br /> 3468 Mt Diablo Blvd Ste 8100 Sample Descript RW2 Received 05/21/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysts Method 8015Mod/8020 Analyzed 06/02/98 <br /> Attention Chnsta Marting Lab Number 9805E41-14 Reported 06J10j98 <br />� <br /> C Batch Number GCO60298BTEX03A " <br /> nstrument 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 6600 <br /> Methyl t-Butyl Ether 25 250 <br /> Benzene 5 0 <br /> Toluene 130 <br /> 5 0 140 <br />' Ethyl Benzene 50 310 <br /> Xylenes (Total) 5 0 560 <br /> Chromatogram Pattern Gas <br />` Surrogates Control Limits % % Recovery <br /> Trlfluorotoluene 70 130 107 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> 1EQUOIA ANALYTICAL ELAP 01210 <br /> J*rd Herling <br /> ct Manager 6 <br /> Page 28 <br />