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I <br /> •� Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 NI Wiget lane Walnut Creek CA 94598 (510) 988-9600 FAX(510)988 9673 <br /> Analytical 819 Stnker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 woo <br /> WCON Tient project ID ARCO 2130, Stockton, CA Sampled ' Nov 19, `1997 <br /> 1433 N Market Blvd Sample Matrix Water Received Nov 21, 1997 <br /> Sacramento, CA 95834 Analysis Method EPA 5030/8020 Modified Reported Dec 10, 1997 <br /> Attention Deanna Santos First Sample # 711-1287 <br /> METHYL TERTIARY BUTYL ETHER (MTBE) <br /> Sample Sample Sample Sample Sample <br /> Analyte Units Results Results Results Results Results <br /> pg/L 711-1287 711-1288 711-1289 711-1290 711-1291 <br /> MW-3(49) MW-4(48) MW 5(48) MW-6(48) MW 7 (48) <br /> MTBE ND ND ND ND ND <br /> Reporting Limit so 50 50 50 50 <br /> Quality Control Data <br /> Date Analyzed 12/02/97 12/02/97 12/02/97 12/02/97 12/02/97 <br /> Instrument Identification GCHP-2 GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Surrogate Recovery, % 94 96 95 109 95 <br /> (OC Limits = 60-140%) <br /> I <br /> i <br /> Purgeable Hydrocarbons are quantitated against afresh gasoline standard <br /> Anatytes reported as N D were not detected at or above the reporting limit <br /> SEQUOIA ANALYTICAL, LAP #1624 <br /> �Pvlze//Z-�e/-� <br /> C <br /> a C Schneider <br /> roject Manager/Sacramento Laboratory <br /> 7111285 EMG <4> <br /> r� <br />