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4D4 Sequoia 680 Chesapeake Drive Redwood City, CA 94063 (415) 364-9600 FAX (415) 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)921-0 100 <br /> MCbN .... . ...... .. <br /> .......... <br /> oliect ID:"'"" At' Aug20, <br /> 1997 <br /> Client Pr ARCO 2 96, Sto"c'ki6n",-`CA' <br /> 1433 N. Market Blvd. Sample Matrix: Water <br /> Sacramento, CA 95834 Analysis Method. EPA 5030/8020 Modified Received: Aug 20, 1997: <br /> Reported: Sep 4, 1997 <br /> . Attention: Claudio Avila First Sample #: 708-0799 <br /> ........... <br /> . . ..... .... <br /> METHYL TERTIARY BUTYL ETHER (MTBE) <br /> Sample Sample Sample Sample <br /> Analyte Units Results Results Results Results <br /> pg/L 708-0799 708-0800 708-0801 708-0802 <br /> MW-1 (74) MW-2 (74) MW-3 (73) VW-30 (60) <br /> MTBE N.D. N.D. N.D. N.D. <br /> Reporting Limit: 500* 510 5.0 5.0 <br /> Quality Control Data <br /> Date Analyzed: 08/27/97 08/27/97 08/27/97 08/27/97 <br /> Instrument Identification: GCHP-7 GCHP-7 GCHP-7 GCHP-7 <br /> Surrogate Recovery, %: 96 98 96 138 <br /> (OC Limits = 60-140%) <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 /> I Reporting limit raised due to matrix interference. <br /> SE <br /> Q�OIA ANALYTICAL, FLAP#1624 <br /> inda C. Schneider <br /> Project Manager/Sacramento Laboratory <br /> 7080799.EMC <2> <br />