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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (5101 988 9600 FAX(510)9a8 9673 <br /> Analytical 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, DHS Luft Reported Apr 1, 1997 <br /> Attention Steve Misner First Sample# 703-0659 <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 /> Mcg/L 703-0659 703-0660 703-0661 703-0662 703-0663 703-0664 <br /> E7 E-5 MW-2 E 11 E2 x ES <br /> Purgeable N D N D 510 N D N D 840 <br /> Hydrocarbons Reporting Limit 50 50 50 50 50 50 <br /> Benzene N D N D 17 N D N D 19 <br /> Reporting Limit 050 0 50 050 050 050 050 <br /> Toluene N D N D 089 N D N D 11 <br /> Reporting Limit 050 050 050 050 050 050 <br /> Ethyl Benzene N D N D 31 N D N D 94 <br /> Reporting Limit 050 050 050 050 0 50 050 <br /> iTotal Xylenes N D N D 44 N D N D 082 <br /> Reporting Limit 050 050 050 050 050 050 <br /> Chromatogram Weathered - Weathered <br /> Pattern Gasoline Gasoline <br /> C6-C12 C6-C12 <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-2 GCHP-7 <br /> Surrogate Recovery, % 89 97 102 91 89 111 <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 /> SEQUOIA ANALYTICAL, FLAP #1624 <br /> *iPMA- '4 FRLeup4o <br /> Edana M Fruciano <br /> Project Manager/Sacramento Laboratory 7030653 SRS 42> <br />