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Sequoia 680 Chesapeake Dnvc Redwood Cary CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lanc Walnut Creek Ca 94598 (510) 988 9600 FAX(510)988 9673 <br /> (D 1 819 Stnkcr Avcnue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> �I� Anaiytica <br /> *rows & 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 Analysis Method EPA 5030/8020 Modified Reported Sep 4, 1997 <br /> Attention Steve Misner First Sample# 708-0758 <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 708-0758 708-Q759 708-0760 708-0761 708-0762 701-�7fi3 <br /> E-7' E-5 MW 2 E-i -2 <br /> MTBE ND ND ND ND ND ND <br /> Reporting Limit 50 so 50* a so 50 50 <br /> Quality Control Data <br /> Date Analyzed 08/26/97 08/26/97 08/26/97 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, % 84 90 84 84 115 126 <br /> (OC 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 /> *Reporting limit raised due to matrix interference <br /> SEQ IA ANALYTICAL ELAP #1624 <br /> 7Pi'nda <br /> C Schneider <br /> rolect Manager/Sacramento Laboratory <br /> 708075213RS <6> <br />