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Sequoia 680 Chesapeake Dnvc Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wigee Lane Walnut Creek CA 94598 (510) 988 9600 FAX(5 101 988 9673 <br /> y�l, F Analytiea1 819 Sinker Avenue Suite 8 Sacramc}to CA 95834 (916) 921 96W FAX(916)921 0100 <br /> 40rown &Caldwell 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 # 708-0758 <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 70U7E ' <br /> 8 E 5 708-0759 7 60 708-0 1 708-0762 708-0763 <br /> MW-2 -11 5 rE-8 <br /> Purgeable 54 N D 2,400 N D 240 1,000 <br /> Hydrocarbons Reporting Limit 50 so 500 50 50 50 <br /> Benzene N D N D 17 N D N D 13 <br /> Reporting Limit 050 050 so 050 050 050 <br /> Toluene N D N D N D N D N D 40 <br /> Reporting Limit 050 050 50 050 050 050 <br /> Ethyl Benzene N D N D N D N D N D 24 <br /> Reporting Limit 050 050 50 050 050 050 <br /> Total Xylenes N D N D 260 N D N D 084 <br /> Reporting Limit 050 050 so 050 050 050 <br /> Chromatogram Weathered Weathered -- Weathered Weathered <br /> Pattern Gasoline Gasoline Gasoline Gasoline <br /> C8-C12 C6-C12 C8-C12 C6-C12 <br /> rl�( <br /> Quality Control Data <br /> Date Analyzed 08/26/97 08/26/97 08/26/97 08/26/97 08/26/97 08/26/97 <br /> Instrument Identification GCHP-7 GCHP-7 GCHP-7 GCHP-7 GCHP-7 GCHP-7 <br /> Surrogate Recovery, % 84 90 84 84 115 126 <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 /> SEQU IA ANALYTICA , EI AP_#11624 <br /> 7ronda C Schnei er <br /> ect Manager/Sacramento Laboratory <br /> 7080752SRS <2> <br />