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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364 9600 fAX(650)364 9133 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue,Suite B Sacramento, CA 95834 (916) 921 9600 FAX(916)921 Ot00 <br /> Gettler Ryan/Geostrategies Client Prol ID Tosco 6981, 140124 02 Sampled 03/25/98 <br /> 6747 Sierra Court Suite J Sample Descript Inf Received 03/26/98 <br /> Dublin, CA 94568 Matrix AIR <br /> Analysis Method 8015Mod/8020 Analyzed 03/28/97 <br /> ,,,Attention Deanna Harding Lab Number 98031-124-01 Reported 04/0.1J98 <br /> CC Batch Number GC032898BTEX03A <br /> Instrument ID GCHP03 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX <br /> Analyte Detection Limit Sample Results <br /> ug/L ug/L <br /> TPPH as Gas 100 450 <br /> Benzene 1 0 N D <br /> Toluene 1 0 N D <br /> Ethyl Benzene 1 0 3 7 <br /> Xylenes (Total) 1 0 50 <br /> Chromatogram Pattern <br /> Weathered Gas C6-C12 <br /> Surrogates Control Limits% % Recovery <br /> Trrfluorotoluene 70 130 82 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL. - ELAP #1210 <br /> '`'` <br /> /i <br /> I regory <br /> Project Manager Page t <br />