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Sequoia680 Chesapeake Drive Redwood city CA 94063 (650)364 9600 FAX(650)364-9233 <br /> (t) 404 N Wiget lane Walnut Creek.CA 94598 (925)988-9600 FAX(925)988 9673 <br /> $19 Striker Avenue Suite 8 Sacramento CA 95834 (916)911-9600 FAX(916)921-0100 <br /> 111W Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-034Z <br /> QECOA Client Project ID Arco #2093, Tracy Sampled Sep 11, 1998 <br /> 9912 Business 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 # 809-1172 <br /> QC Batch Number GCO91698 GCO91698 GCO91698 GCO91698 GCO91698 GC091698 <br /> 802005A 802005A 802005A 802005A 802005A 802005A <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX / MTBE <br /> Reporting Sample Sample Sample Sample Sample Sample <br /> Analyte Limit I D I D I D I D I D I D <br /> pg/L 809-1172 809-1173 809-1174 809-1175 809-1176 809-1177 <br /> SMW-1 ATR-1 ATR-2 ATR-3 ATR-4 ATR-6 <br /> Purgeable <br /> Hydrocarbons 50 N D N D N D 1 100 N D N D <br /> Benzene 050 N D N D N D 61 N D N D <br /> Toluene 050 ND ND ND ND ND ND <br /> Ethyl Benzene 050 N D N D N D 25 N D N D <br /> Total Xylenes 050 N D N D N D 11 N D N D <br /> MTBE 25 290 N D 250 41 N D N D <br /> Chromatogram Pattern - - - Gasoline <br /> Quality Control Data <br /> Report Limit Multiplication Factor 1 0 1 0 1 0 10 10 10 <br /> Date Analyzed 9/16/98 9/16/98 9/16/98 9/16/98 9/16/98 9/16/98 <br /> Instrument Identification HP-5 HP-5 HP-5 HP-5 HP-5 HP-5 <br /> Surrogate Recovery, % 97 98 104 89 95 99 <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 <1 7 <br />