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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (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 Scnker Avenue Suite 8 Sacramento CA 95834 (916) 921 96W FAX(916)921 0100 <br /> Arill7 <br /> 18rown & Caldwell Client Project ID ARCO 02133, Stockton, CA Sampled Nov 25, 1997 <br /> 9616 Micron Ave , Suite 600 Sample Descrlpt Water, 6HD-1 Received Nov 26, 1997 <br /> Sacramento, CA 95827 Analysis Method EPA 5030/8260 Analyzed Dec 9, 1997 <br /> Attention Steve Misner Lab Number 711-1543 Reported Dec 12, 1997 <br /> OXYGENATES by GC/MS (EPA 8260) <br /> Analyte Reporting Limit Sample Results <br /> yg/L pg/L <br /> Tertiary butanol 170 N D <br /> Methyl tertiary butyl ether (MTBE) 33 240 <br /> DI-Isopropyl ether (DIPE) 33 N D <br /> Ethyl tertiary butyl ether (ETRE) 33 N D <br /> Tertiary amyl methyl ether (TAME) 33 38 <br /> Analytes reported as N D were not detected at or above the reporting limit Because matrix effects and/or other factors <br /> required additional sample ddut,on reporting limits for this sample have been raised <br /> SEQUOIA ANALYTI AL, ELAP #1210 <br /> nda C Sch eider <br /> rolect Manager/Sacramento Laboratory <br /> 7111534 BRS <6> <br />