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�Y Sequoia_ 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364 9233 <br /> i 404 N Wiget Lane Wainut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> _ 819 Striker Avenue-Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Analytical <br /> 110 EMCON Client Project ID ARCO 548, Stockton CA Sampled Nov 18, 1997 <br /> 1433 N Market Blvd Sample Matrix Water Received Nov 20, 1997 <br /> Sacramento, CA 95834 Analysts Method EPA 5030/8020 Modified Reported Dec 8, 1997 <br /> Attention Deanna Santos First Sample # 711-1184 <br /> METHYL TERTIARY BUTYL ETHER (MTBE) <br /> Sample Sample- Sample Sample Sample Sample <br /> Analyte Units Results Results Results Results Results Results <br /> lig/L 711-1184 711-1185 711-1186 711-1187 711-1188 711-1189 <br /> MW-1 (56) MW-2 (61) MW-3(62) MW-4 (64) MW-5(61) MW 6 (57) <br /> MTBE ND ND ND ND ND ND <br /> Reporting Umit 5 0 5 0 5 0 5 0 25* 5 0 <br /> Duality Control Data <br /> Date Analyzed 12/01/97 12/01/97 12/01/97 12/01/97 12/01/97 12/01/97 <br /> instrument Identification GCHP-7 GCHP-7 GCHP-7 GCHP-7 GCHP-7 GCHP-7 <br /> Surrogate Recovery, % 93 90 90 92 84 92 <br /> (QC Limits = 60-140%) <br /> *Reporting limit raised due to matrix interference <br /> Purgeabie Hydrocarbons are quantitated against afresh gasoline standard <br /> Anaiytes reported as N D were not detected at or above the reporting limit <br /> SEQUOIA ANALYTICj!�o ELAP #1624 <br /> 01 <br /> nda C Schneider <br /> / rolect <br /> ( Manager/Sacramento Laboratory <br /> 7111184 EMC <2> <br />