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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364-9600 FAX(415)364 9233 <br /> Analytical 1 404 N W,get Lane Walnut Creek CA 94598 (510) 988 9600 FAX(5 10)988 9673 <br /> WWOF alytical 819 Striker Avenue Suite 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, OHS Luft Reported Apr 1, 1997 <br /> Attention Steve Misner First Sample# 703-0653 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Sample Sample Sample Sample Sample Sample <br /> Analyte Units Results Results Results Results Results Results <br /> pg/L 703-0653 703-0654 703-0655 703-0656 703-0657 703-0658 <br /> PR-1 .� PR-2 BHD-2 MW-3 MW-4 E-12 <br /> Purgeable N D N D N D N D N D N D <br /> Hydrocarbons Reporting Limit 50 50 50 50 50 50 <br /> Benzene N D N D N D N D N D N D <br /> Reporting Limit 050 050 050 050 050 050 <br /> Toluene ND ND ND ND ND ND <br /> Reporting Limit 050 050 050 050 050 050 <br /> Ethyl Benzene N D N D N D N D N D N D <br /> Reporting Limit 050 050 050 050 050 050 <br /> Total Xylenes N D N D N D N D N D N D <br /> Reporting Limit 050 050 050 050 050 050 <br /> Chromatogram - - <br /> Pattern <br /> Quality Control Data <br /> Date Analyzed 03/24/97 03/24/97 03/24/97 03/24/97 03/24/97 03/24/97 <br /> Instrument Identification GCHP-7 GCHP-7 GCHP-7 GCHP-7 GCHP-7 GCHP-7 <br /> Surrogate Recovery, % 93 93 95 91 93 90 <br /> PC 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, £LAP #1624 <br /> 06pkl'h-M FRWA- [o <br /> Edana M Fruciano <br /> Project Manager/Sacramento Laboratory 7030653 BRS <1 <br />