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Sequoia 680 Chesapeake Drive Rcdwood Cry CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wigct Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510)988 9673 <br /> X111 Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> Grown & 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# 708-0752 <br /> METHYL TERTIARY BUTYL ETHER (MTBE) <br /> Sample Sample Sample Sample Sample Sample <br /> Analyte Units Results Results Results Results Results Results <br /> pg/L 7P&-Q752 708- 53 708-0754 7 55 708-0756 708- <br /> PR 1 PR- Q�4� <br /> MW 4 E-12 <br /> MTBE ND ND N_D ND ND ND <br /> Reporting Limit 5 0 50 5 0 so so so <br /> Quality Control Data <br /> Date Analyzed 08/25/97 08/25/97 08/25/97 08/26/97 08/26/97 08/26/97 <br /> Instrument Identification GCHP-7 GCHP-7 GCHP-7 GCHP-7 GCHP-7 GCHP-7 <br /> Surrogate Recovery, % 99 95 94 90 88 69 <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 /> SEQ IA ANALYTICA , ELAP #1624 <br /> nda C Schnei er <br /> roject Manager/Sacramento Laboratory <br /> t 7080752 BRS <5> <br />