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Sequoia 680 Chesapeake Drive Redwood CIM CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N Wiget lane Walnut Creek CA 94598 (510) 988 96W FAX(510)988-9673 <br /> Analytical 819 Stinker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> EMCON Client Project Ib ARCO 2130, Stockton, CA Sampled Nov 20, 1997 <br /> 1433 N Market Blvd Sample Matrix Water Received Nov 21, 1997 <br /> Sacramento CA 95834 Analysis Method EPA 5030/8020, DHS Luft Reported Dec 10, 1997 <br /> Attention Deanna Santos First Sample # 711-1285 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Sample Sample Sample <br /> Analyte Units Results Results Results <br /> Ng/L 711-1285 711-1286 711-1292 <br /> MW-11 (48) MW-2(48) MW-10 (48) <br /> Purgeable 170 N D 510 <br /> Hydrocarbons Reporting Limit 50 50 50 <br /> Benzene 70 1 7 22 <br /> Reporting Limit 050 050 050 <br /> Toluene 077 089 22 <br /> Reporting Limit 050 050 050 <br /> Ethyl Benzene N D N D 093 <br /> Reporting Limit 050 050 050 <br /> Total Xylenes 063 087 31 <br /> ` Reporting Limit 050 050 050 <br /> Chromatogram Weathered - Weathered <br /> Pattern Gasoline Gasoline <br /> C6-C12& C6 C12 <br /> Unidentified <br /> Hydrocarbons <br /> C6-C8 <br /> Quality Control Data <br /> Date Analyzed 12/02/97 12/02/97 12/02/97 <br /> Instrument Identification GCHP-2 GCHP-2 GCHP-2 <br /> Surrogate Recovery, % 112 92 87 <br /> (GSC 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 limit <br /> SEQU 1A ANALYTICAL, LAP #1624 <br /> ' inda C Schneider <br /> roject Manager/Sacramento Laboratory <br /> 7111295 EMC <1> <br />