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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 w <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 0]00 <br /> SECOR Client Project ID ARCO 2133, Stockton, CA Sampled Mar 20, 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# 803-1005 <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 803-1005 803-1006 803-1007 803-1008 803-1009 803-1010 <br /> E-2 E-3 E-5 BHS-2 MW 5 BHD 1 <br /> MTBE 27 ND ND ND ND 210 <br /> Reporting Limit 50 5 0 50 5 0 5 0 5 0 <br /> Quality Control Data <br /> Date Analyzed 03/27/98 03/27/98 03/27/98 03/27/98 03/27/98 03/27/98 <br /> Instrument Identification GCHP-2 GCHP-2 GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Surrogate Recovery, % 102 99 130 101 100 93 <br /> (Recovery Limits 60-140%) <br /> Analytes reported as N D were not detected at or above the reporting limit <br /> SEQUOIA ANALYTICA , ELAP #1624 <br /> da C Schneider <br /> 10,rojecManager/Sacramento Laboratory <br /> 8030992 SES <9> <br />