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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 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> SECOR Client Project ID ARCO 2133, Stockton, CA Sampled Mar 19, 1998 <br /> 3050 Fite Circle, Ste 204 Sample Matrix Water Received Mar 23, 1998 <br /> Sacramento, CA 95827 Analysis Method EPA 5030/8020A Modified Reported Apr 7, 1998 <br /> Attention Rusty Benkosky First Sample # 803-0998 <br /> METHYL TERTIARY BUTYL ETHER (MTBE) <br /> Sample Sample Sample Sample Sample Sample <br /> Analyte Units Results Results Results Results Results Results <br /> erg/L 803-0998 803-0999 803-1000 803-1001 803-1002 803-1003 <br /> E 12 PR-1 PR 2 MW-1 MW 2 MW-3 <br /> MTBE ND ND ND ND ND ND <br /> Reporting Limit 50 50 50 50 50 50 <br /> Qualtty Control Data <br /> Date Analyzed 03/26/98 03/26/98 03/27/98 03/27/98 03/27/98 03/27/98 <br /> Instrument Identification GCHP-7 GCHP-7 GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Surrogate Recovery, % 93 94 100 99 94 101 <br /> (Recovery Limits 60-140%) <br /> Analytes reported as N 0 were not detected at or above the reporting limit <br /> �SEQUOI ANALYTICAL, LAP #1662/24 <br /> 7ectda Schneider <br /> Manager/Sacramento Laboratory <br /> 8030992 SES <7> <br />