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Sequoia 680 Chesapeake Drive Redwood C.cy CA 94063 (415) 364-9600 FAX(415) 364 9233 <br /> Analytical <br /> 1 404 N Wiget Lane Walnut Creck CA 94598 (510) 988 9600 FAX(S10)988 9673 <br /> WAW alytical - 819 Striker Avenue Suice 8 Sacramento CA 95834 (916) 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 EPA 5030/8020, DHS Luft Reported Apr 1, 1997 <br /> Attention Steve Misner First Sample # 703-0671 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Sample Sample <br /> Analyte Units Results Results <br /> pg/L 703-0671 703-0672 <br /> E-9 E 10 <br /> Purgeable N D 1,600 <br /> Hydrocarbons Reporting Umit 50 100 <br /> Benzene N D 39 <br /> Reporting Limit 050 1 0 <br /> Toluene N D 43 <br /> Reporting Limit 050 10 <br /> Ethyl Benzene N D 52 <br /> Reporting Limit 050 1 0 <br /> Total Xylenes N D 48 <br /> Reporting Limit 050 10 <br /> Chromatogram - Gasoline <br /> Pattern CS-C12 <br /> Quality Control Data <br /> Date Analyzed 03/24/97 03/25/97 <br /> Instrument Identification GCHP-2 GCHP-2 <br /> Surrogate Recovery % 85 86 <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 41624 <br /> WA-11A k( . F2Le'fA li0 <br /> Edana M Fruciano <br /> Project Manager/Sacramento Laboratory 7030653 SRS <4> <br />