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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) 988-96W FAX(510)988-9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921.9600 FAX(916)921-01 DO <br /> ......... .. . . .....Sampled: <br /> ....�Sampled: .Nov 20, 1 997.'r: <br /> EIVICON .... ' <br /> lent Project ID., ARCO2186, Stockton, CA <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 #: 711-1280 <br /> .... ........ <br /> METHYL TERTIARY BUTYL ETHER (MTBE) <br /> Sample Sample Sample Sample Sample <br /> Analyte Units Results Results Results Results Results <br /> Mg1L 711-1280 711-1281 711-1282 711-1283 711-1284 <br /> MW-1 (50) MW-2 (50) MW-3(50) VW-31) (50) MW-4 (50) <br /> MTBE N.D. N.D. N.D. N.D. 11 <br /> Reporting Limit: 1000* 5.0 5.0 5.0 5.0 <br /> Quality Control Data <br /> Date Analyzed: 12/01/97 12/01/97 12/01/97 12/01/97 12/01/97 <br /> Instrument Identification: GCHP-2 GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Surrogate Recovery, %: 93 92 93 88 90 <br /> (OC Limits = 60-140%) <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 /> SEQUOIA ANALYTICAL, ELAP #1624 <br /> nda C. Schneider <br /> roject Manager/Sacramento Laboratory 7111280.EMO <2> <br />