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Sequoia = 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)M 4-9233 <br /> 404 N Wiget lane Walnut Creek.CA 94598 (925)988-9600 FAX(925)988 9673 <br /> �i117 Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-010 0 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792 0342 <br /> 68CCOR Client Project ID Arco #2093, Tracy Sampled Sep 11, 1998 <br /> 9912 Bustness Park Drive Suite 100 Sample Matrix Water Received Sep 14, 1998 <br /> Sacramento, CA 95827 Analysis Method EPA 5030/8015 Mod /8020 Reported Sep 25, 1998 <br /> Attention Rusty Benkosky First Sample # 809-1178 <br /> QC Batch Number GCO91698 GCO91698 GC091698 GC091798 GCO91698 <br /> 802005A 802005A 802005A 802002A 802005A <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX / MTBE <br /> Reporting Sample Sample Sample Sample Sample <br /> Analyte Limit I D I D I D I D I D <br /> pg/L 809-1178 809-1179 809-1180 809-1181 809-1182 <br /> ATR-7 ATR-9 ATR-10 ATR-11 ATR-12 <br /> Purgeable <br /> Hydrocarbons 50 N D N D N D N D N D <br /> Benzene 050 N D N D N D N D N D <br /> Toluene 050 N D N D N D N D N D <br /> Ethyl Benzene 0 50 N D N D N D N D N D <br /> Total Xylenes 0 50 N D N D N D N D N D <br /> MTBE 25 ND ND ND ND ND <br /> Chromatogram Pattern - - - <br /> Quality Control Data <br /> Report Limit Multiplication Factor 1 0 1 0 1 0 1 0 1 0 <br /> Date Analyzed C/16/98 9/16/98 9/16/98 9/17/98 9/16/98 <br /> Instrument Identification HP-5 HP-5 HP-5 HP-2 HP-5 <br /> Surrogate Recovery, % 104 114 108 120 101 <br /> (QC Limits = 70-130%) <br /> Purgeable Hydrocarbons are quantitated against a fresh gasoline standard <br /> Analytes reported as N D were not detected above the stated reporting limit <br /> SEQUOIA ANALYTICAL, #1271 <br /> Melissa A Brewer <br /> Project Manager <br /> 8091172 SEC <2> <br />