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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 36.4 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Sinker Avenue Since 8 Sacramento CA 95834 (9 16) 921 9600 FAX (916)921 0100 <br /> 18own & 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 # 708-0764 <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 708-0764 70 - 765 708:W6 708-0767 708-0768 708-0769 <br /> MW-1 E- MW 5 BHD E-3 E 4 <br /> MTBE N D 24 N D 360 N D 110 <br /> Reporting Limit 50 5 0 5 0 10 50* 0 10 <br /> Quality Control Data <br /> Date Analyzed 08/26/97 08/27/97 08/26/97 08/27/97 08/27/97 08/27/97 <br /> Instrument Identification GCHP-7 GCHP-7 GCHP-7 GCHP-7 GCHP-7 GCHP-7 <br /> Surrogate Recovery, % 80 104 94 104 111 155** <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 /> Reporting limit raised due to matrix interference <br /> *' <br /> Matrix interference <br /> SEQUOIA ANALYTICAL, ELAP #1624 <br /> 0 <br /> Linda C Schneider <br /> Project Manager/Sacramento Laboratory <br /> 7080752 SRS <77 <br />