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Sequoia )80 Chesapeake Drive Redwood City CA 9406 (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 Sinker Avenue Suite 8 Sacramento CA 95834 (9t6) 921 9600 FAX(916)921 0100 <br /> Gettler Ryan/Geostrategies Client Pro] ID Unocal SS#0187, 280045 85 Sampled 03/09/98- <br /> 6747 Sierra Court Suite J Sample Descript U-8 Received 03/09/98 <br /> Dublin, CA 94568 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 03/11/98 <br /> Attention Deanna Harding Lab Number 9803524-09 Reported 03J18J98 <br /> QC Batch Number GC031198BTEX02A - µ <br /> Instrument ID GCHP2 <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 50 100 <br /> Methyl t-Butyl Ether 25 N D <br /> Benzene 050 N D <br /> Toluene 050 N D <br /> Ethyl Benzene 0 50 N D <br /> Xylenes (Total) 0 50 N D <br /> Chromatogram Pattern GAS <br /> Surrogates Control Limits % % Recovery <br /> Trlfluorotoluene 70 130 97 <br /> 0 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP 41210 <br /> Wkr ory <br /> roject Manager Page 8 <br />