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Sequoia 680 Chesapeake Drive 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 /> �II� Analytical 819 Striker,avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Grown & Caldwell Client Project ID ARCO 02133 Stockton, CA Sampled Nov 25 1997 <br /> 9616 Micron Ave Suite 600 Sample Matrix Water Received Nov 26, 1997 <br /> Sacramento, CA 95827 Analysis Method EPA 5030/8020, DHS Luft Reported Dec 12, 1997 <br /> Attention Steve Misner First Sample# 711-1540 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Sample Sample Sample Sample <br /> Analyte Units Results Results Results Results <br /> pg/L 711-1540 711-1541 711-1542 711-1543 <br /> 5 E-� EJ0 BHD 1 <br /> Y �J V <br /> Purgeable 210 N D 10,000 1,300 <br /> Hydrocarbons Reporting Limit 50 50 1,000 50 <br /> Benzene N D N D 1,000 28 <br /> Reporting Limit 050 050 10 05G <br /> Toluene N D N D 320 085 <br /> Reporting Limit 050 050 10 050 <br /> Ethyl Benzene N D N D 200 79 <br /> Reporting Limit 050 050 10 050 <br /> 40Total Xylenes 096 N D 1 400 28 <br /> Reporting Limit 050 050 10 050 <br /> Chromatogram unidentified - Gasoline Gasoline <br /> Pattern Hydrocarbons C6-C12 C6 C12 <br /> C6 C12 <br /> Quality Control Data <br /> Date Analyzed 12/04/97 12/04/97 12/04/97 12/05/97 <br /> Instrument Identification GCHP-2 GCHP-2 GCHP-1 GCHP-2 <br /> Surrogate Recovery, % 106 104 1 i 1 96 <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 ANALYTIC , ELAP #1624 <br /> Avida C Schneider <br /> (IF"roject Manager/Sacramento Laboratory <br /> 7111534 BRs <a> <br />