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/ \ Sequoia 680 Chesapeake Drive Redwood Gry CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 104 iV W,get Lane Walnut Creek Ca 94598 (510) 988 9600 FAX(5t0)988 9673 <br /> Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (9t6) 921 9600 FAX(916)921 0100 <br />• Brown & Caldwell Client Project ID Arco 02133, Stockton, CA Sampled Mar 19, 1997 <br /> 9616 Micron Ave , Suite 600 Sample Matrix Water Received Mar 20, 1997 <br /> Sacramento, CA 95827 Analysis Method BPA 5030/8020 Modified Reported Apr 1, 1997 <br /> Attention Steve Misner First Sample # 703-0663 <br /> METHYL TERTIARY BUTYL ETHER (MTBE) <br /> Sample Sample Sample Sample <br /> Anaiyte Unds Results Results Results Results <br /> ppmv 703-0663 703-0665 703-0671 703-0672 <br /> E-2 Mw-t E 9 E-10 <br /> MTBE N D N D ND x 1_,1_00 )( <br /> Reporting Limit 50 so 50 50 - <br /> Quality Control Data <br /> Date Analyzed 03/24/97 03/24/97 03/24/97 03/25/97 <br /> Instrument Identification GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Surrogate Recovery, % 89 82 85 80 <br /> (QC 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 /> SEQUOIA ANALYTICAL, ELAP #1624 <br />•��' M �.�o.,lo <br /> Edana M Fruciano <br /> Project Manager/Sacramento Laboratory 7030653 BRS <5> <br />