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Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (650) 364 9500 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 (916) 921 9600 FAX (916)921 0100 <br /> larown & Caldwell Client Project ID ARCO 02133, Stockton, CA Sampled Nov 25, 1997 <br /> 9616 Micron Ave Suite 600 Sample Descrlpt Water, E-10 Received Nov 26, 1997 <br /> Sacramento, CA 95827 Analysis Method EPA 5030/8260 Analyzed Dec 9 1997 <br /> Attention Steve Misner Lab Number 711-1542 Reported Dec 12 1997 <br /> OXYGENATES by GC/MS (EPA 8260) <br /> Analyte Reporting Limit Sample Results <br /> pg/L N9/L <br /> Tertiary butanol 12,000 N D <br /> Methyl tertiary butyl ether (MTBE) 250 18,000 <br /> Dl-isopropyl ether (DIPE) 250 N D <br /> Ethyl tertiary butyl ether (ETBE) 250 N D <br /> Tertiary amyl methyl ether (TAME) 250 380 <br /> Analytes reported as N D were not detected at or above the reporting llmrt Because matrix effects and/or other factors <br /> required additional sample dilution reporting limits for this sample have been raised <br /> SEQUOIA ANALYTICAL, LAP #1210 <br /> L1 da C Schneider <br /> roject Manager/Sacramento Laboratory <br /> 7111534 BRS ¢57 <br />