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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 96W FAX(415) 364 9233 <br /> 404 K W,get Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> (i) t 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> (11,� Analyte ea <br /> *own &Caldwell Client Project ID ARCO 02133, Stockton, CA Sampled Aug 19, 1997 <br /> 9616 Micron Ave , Suite 600 Sample Matrix Water Received Aug 20, 1997 <br /> Sacramento, CA 95827 Analysts Method EPA 5030/8020 Modified Reported Sep 4, 1997 <br /> Attention Steve Misner First Sample# 708-0770 <br /> METHYL TERTIARY BUTYL ETHER (MTBE) <br /> Sample Sample <br /> Analyte Units Results Results <br /> pg/L 70 -077 708-0 <br /> c=-9 -10 <br /> MTBE; N D 1,900 <br /> Reporting Limit 50 500 <br /> Quality Control Data <br /> Date Analyzed 08/26/97 08/27/97 <br /> Instrument Identification GCHP-7 GCHP-7 <br /> Surrogate Recovery, % 92 90 <br /> (QC Limits = 60-140%) <br /> Purgeable Hydrocarbons are quantitated against a fresh gasoline standard <br /> Analytes reported as N D were not detected at or above the reporting limit <br /> SEQUOIA ANALYTICA , ELAP #1624 <br /> tnda Schneider <br /> Project Manager/Sacramento Laboratory <br /> 7080752 BRS <8> <br />