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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 /> • <br /> E-MCON Client Project ID ARCO 2168, Stockton, CA Sampled Nov 17, 1997 <br /> 1433 N Market Blvd Sample Matrix Water Received Nov 18, 1997 <br /> Sacramento, CA 95834 Analysis Method EPA 5030/8020 Modified Reported Dec 4, 1997 <br /> Attention Deanna Santos First Sample # 711-0993 <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 711-0993 711-0994 711-0995 711-0996 711-0997 711-0998 <br /> MW-1 (54) MW-2(53) MW 3(54) MW-4(59) MW-5 (55) MW-6(41) <br /> MTBE ND ND ND ND ND ND <br /> Reporting Limit 1 000* 100* 1,000* 1,000* 500* 2,000* <br /> Duality Control Data <br /> Date Analyzed 11/24/97 11/25/97 11/24/97 11/24/97 11/26/97 11/25/97 <br /> Instrument Identification GCHP-7 GCHP-7 GCHP-7 GCHP-7 GCHP-7 GCHP-7 <br /> Surrogate Recovery, % 113 117 100 97 92 98 <br /> (QC Limits = 60-140°/x) <br /> *Reporting limit raised due to matrix interference <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 /> �EQU A ANALYTICA ELAP #1624 <br /> n <br /> da ZSchneii er <br /> rolect Manager/Sacramento Laboratory <br /> Q� 7110993 EMC <3> <br />