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Sequoia 680 Chesapeake Dnve Redwood City,CA 94063 (650) 364-9600 FAX(650)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 0100 <br /> • r:MCON Client Project ID Arco 548, Stockton, CA Sampled Feb 16, 1998 <br /> 1433 N Market Blvd Sample Matrix Water Received Feb 18, 1998 <br /> Sacramento, CA 95834 Analysis Method EPA 5030/8020, DHS Luft Reported Mar 4, 1998 <br /> Attention Dave Foley First Sample # 802-0455 <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 /> µg/L 802-0455 802-0456 802-0457 802-0458 802-0459 802-0460 <br /> MW-1 (57) MW-2(60) MW-3(63 3) MW-4(63 8) MW-5 (61 5) MW-6(57) <br /> Purgeable N D N D 140 N D 630 N D <br /> Hydrocarbons Reporting Limit 50 50 50 50 50 50 <br /> Benzene 19 N D 050 N D 110 N D <br /> Reporting Limit 050 050 050 050 25 050 <br /> Toluene 28 N D 071 N D N D N D <br /> Reporting Limit 050 050 050 050 25 050 <br /> Ethyl Benzene 074 N D N D N D 22 N D <br /> Reporting Limit 050 050 050 050 25 050 <br /> Total Xylenes 27 N D N D N D 83 N D <br /> Reporting Limit 050 050 050 050 25 050 <br /> Chromatogram -- -- Weathered -- Weathered <br /> Pattern Gasoline Gasoline <br /> C6-C12 C6-C12 <br /> Quality Control Data <br /> Date Analyzed 02/23/98 02/23/98 02/23/98 02/23/98 02/23/98 02/23/98 <br /> Instrument Identification GCHP-2 GCHP-2 GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Surrogate Recovery, % 93 92 84 95 93 98 <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 /> XL�IL-1 AJ). <br /> Ronald W Bobel <br /> Project Manager/Sacramento Laboratory <br /> 8020455 EMC <1> <br />