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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creck CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Iwo Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> SrOWn & CaldWe[I Client Project ID ARCO 02133, Stockton, CA Sampled Aug 19, 1997 <br /> 9616 Micron Ave , Suite 600 Sample Matrix Water Received Aug 20, 1997 <br /> Sacramento, CA 95827 Analysis Method EPA 5030/8020, DHS Luft Reported Sep 4, 1997 <br /> Attention Steve Misner First Sample# 708-0764 <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 /> erg/L - 4 708-0765 708-0766 7p94Rk7 <br /> N{W i 708- 768 708- �769 <br /> E-C!iD E <br /> Purgeable N D 200 N D 440 3,900 1,800 <br /> Hydrocarbons Reporting Limit 50 50 50 50 500 100 <br /> Benzene N D 24 N D 79 50 83 <br /> Reporting Limit 050 050 050 050 50 10 <br /> Toluene N D 091 N D 094 10 78 <br /> Reporting Limit 050 050 050 050 50 10 <br /> Ethyl Benzene N D 27 N D N D 41 63 <br /> Reporting Limit 050 050 050 050 50 1 0 � <br /> . Total Xylenes N D 26 N D N D 28 76 <br /> Reporting Limit 050 050 050 050 50 10 <br /> Chromatogram - Gasoline Weathered Weathered Weathered <br /> Pattern C6-C12 Gasoline Gasoline Gasoline <br /> C6-C12 C6-C12 C6-C12 <br /> Quality Control Data <br /> Date Analyzed 08/26/97 08/27/97 08/26/97 08/27/97 08/27/97 08/27/97 <br /> Instrument Identification GCHP-7 GCHP-7 GCHP-7 GCHP-7 GCHP-7 GCHP-7 <br /> Surrogate Recovery, % 80 104 94 125 ill 155* o <br /> (QC Limits = 60-140°/x) <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 /> Matrix interference <br /> SEQU lA ANALYTICAL, ELAP #1624 <br /> 7Pirnda C Schneider <br /> ct Manager/Sacramento Laboratory <br /> 7080752 BRS <3> <br />