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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N WiBet 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 /> • <br /> 8LCOR 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# 803-0992 <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 803-0992 803-0993 803-0994 803-0995 803-0996 803-0997 <br /> E-4 E-6 E-7 E 8 E 9 E 11 <br /> MTBE 14 13 N D N D 320 N D <br /> Reporting Limit 50 50 50 50 10 50 <br /> a <br /> Quality Control Data <br /> Date Analyzed 03/26/98 03/26/98 03/26/98 03/26/98 03/27/98 03/26/98 <br /> Instrument Identification GCHP-7 GCHP-7 GCHP-7 GCHP-7 GCHP-7 GCHP-7 <br /> Surrogate Recovery, % 91 94 95 93 90 95 <br /> (Recovery Limits 60-140%) <br /> Analytes reported as N D were not detected at or above the reporting limit <br /> EQU A ANALYTICAL, LAP #1624 <br /> faCSchneeer <br /> rManager/Sacramento Laboratory <br /> 8030992 SES <6> <br />