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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364 9600 FAX(650)364 9133 <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 (9 16) 921 9600 FAX(916)921 0100 <br /> 1W 0 <br /> SECOR Client Project ID ARCO 2133, Stockton, CA Sampled Mar 20, 1998 <br /> 3050 Fite Circle Ste 204 Sample Matrix Water Received Mar 23, 1998 <br /> Sacramento CA 95827 Analysis Method PPA 5030/8020, DHS Luft Reported Apr 7, 1998 <br /> Attention Rusty Benkosky First Sample # 803-1005 <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 803-1005 803-1006 803-1007 803-1008 803-1009 803-1010 <br /> E-2 E-3 E-5 BHD-2 MW-5 BHD 1 <br /> Purgeable N D N D 1,200 N D N D 490 <br /> Hydrocarbons Reporting Limit 50 50 50 50 50 50 <br /> Benzene N D N D 57 N D N D 34 <br /> Reporting Limit 050 050 050 050 050 050 <br /> Toluene N D N D 26 N D N D 30 <br /> Reporting Limit 050 050 050 050 050 050 <br /> Ethyl Benzene N D N D 1 4 N D N D 37 <br /> Reporting Limit 050 050 050 050 050 050 <br /> Total Xylenes - N D N D 13 N D N D 24 <br /> Reporting Limit 050 050 050 050 050 050 <br /> Chromatogram - Weathered -- -- Weathered <br /> Pattern Gasoline& Gasoline <br /> Unidentified C6-C12 <br /> Hydrocarbons <br /> C6-C12 <br /> Quality Control Data <br /> Date Analyzed 03/27/98 03/27/98 03/27/98 03/27/98 03/27/98 03/27/98 <br /> Instrument Identification GCHP-2 GCHP-2 GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Surrogate Recovery, % 102 99 130 101 100 93 <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 /> ,,0SEQ1JA ANALYTICA ELAP #1624 <br /> 77pila/C Schneider <br /> roject Manager/Sacramento Laboratory <br /> 8030992 SES <4> <br />