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41� 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 /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Gettler Ryan/Geostrategies Client Pro) ID Chevron 9-6171, Stockton - <br /> { 6747 Sierra Court Suite G Sample Descript MW-5 Sampled 11/1 2/96 <br /> Dublin, CA 94568 Matrix LIQUID Received 11/12/96 - <br /> Analysis Method 8015Mod/8020 Analyzed 11/15/96 <br /> Attention Deanna Harding _ Lab Number 9611619-05 <br /> Reported 11f20196 <br /> QC Batch Number GC1 11 b96BTEX20A --- <br /> Instrument ID GCHP20 _ <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX and MTBE <br /> Analyte Detection Limit <br /> eg/L Sample Results <br /> ug/L <br /> TPPH as Gas 50 <br /> Methyl t-Butyl Ether - 2 5 - 200 <br /> Benzene 0 50 N D <br /> Toluene 0 50 N D <br /> Ethyl Benzene 0 50 N D <br /> Xylenes (Total) 0 50 N D <br /> Chromatogram Pattern N D <br /> Discrete Peak <br /> - - - C7-C8 <br /> Surrogates Control Limits % <br /> Trifluorotoluene 70 /o Recovery <br /> 130 89 <br /> 0 <br /> analytes reported as N 0 were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP #1210 <br /> 60/-regory Manager <br /> Page 7 <br />