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Sequoia 680 Chesapeake Dnve Redwood City,CA 94063 (415) 364-9600 FAX(415) 364-9233 <br /> 404 N Weget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(5 10)988 9673 <br /> Analytical 819 Stnker Avenue,Suite 8 Sacramento CA 95834 (916) 931 9600 FAX(916)911 0100 <br /> EMCON Client Project ID ARCO 2130, Stockton, CA Sampled Aug 19, 1997 <br /> 1433 N Market Blvd Sample Matrix Water Received Aug 20, 1997- <br /> Sacramento, CA 95834 Analysis Method EPA 5030/8020, DHS Luft Reported Sep 4, 1997 <br /> Attention Claudio Avila First Sample # 708-0787 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Sample Sample Sample Sample Sample <br /> Analyte Units Results Results Results Results Results <br /> pg/L 708-0787 708-0788 708-0789 708-0791 708-0794 <br /> MW-1 (73) MW-2 (72) MW-3 (72) MW-5 (75) MW-10 (70) <br /> I r nriu nm <br /> Purgeable 200 1,200 N D 100 440 <br /> Hydrocarbons Reporting Limit 50 500 50 50 50 <br /> Benzene 65 240 N D 20 N D <br /> Reporting Limit 050 50 050 050 050 <br /> Toluene N D N D N D N D N D <br /> Reporting Limit 050 50 050 050 050 <br /> Ethyl Benzene N D 41 N D 38 N D <br /> Reporting Limit 050 50 050 050 050 <br /> Total Xylenes N D N D N D N D N D <br /> Reporting Limit 050 50 050 050 050 <br /> Chromatogram Weathered Weathered -- Weathered Unidentified <br /> Pattern Gasoline Gasoline Gasoline Hydrocarbons <br /> C6-C12 C6-C12 C6-C12 C6 C12 <br /> Quality Control Data <br /> Date Analyzed 08/27/97 08/27/97 08/27/97 08/27/97 08/27/97 <br /> Instrument Identification GCHP-2 GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Surrogate Recovery, % 102 90 96 91 90 <br /> (QC Limits = 60-140%) <br /> Purgeable Hydrocarbons are quantitated against a fresh gasoline standard <br /> Analytes reported as N 0 were not detected at or above the reporting fimrt <br /> SEQUOIA ANALYTICA ELAP #1624 <br /> /PindaSchneider <br /> Manager/Sacramento Laboratory <br /> 7080787 EMC <1> <br />