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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> ,!D— 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(5 10)968 9673 <br /> VQFAnalytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (9t6) 921 9600 FAX(916)921 0100 <br /> 0 <br /> SECOR Client Project ID ARCO 2133, Stockton, CA Sampled Mar 19, 1998 <br /> 3050 Fite Circle, Ste 204 Sample Matrix Water Received Mar 23, 1998 <br /> Sacramento, CA 95827 Analysis Method EPA 5030/8020, DHS Luft Reported Apr 7 1998 <br /> Attention Rusty Benkosky First Sample # 803-0992 <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 803-0992 803-0993 803-0994 803-0995 803-0996 803-0997 <br /> E-4 E-6 E-7 ES E9 E-11 <br /> Purgeable 110 ND ND ND ND ND <br /> Hydrocarbons Reporting Limit 50 50 50 50 50 50 <br /> Benzene 36 ND ND ND ND ND <br /> Reporting Limit 050 050 050 050 050 050 <br /> Toluene ND ND ND ND ND ND <br /> Reporting Limit 050 050 050 050 050 050 <br /> Ethyl Benzene N D N D N D N D N D N D <br /> Reporting Limit 050 050 050 050 050 050 <br /> Total Xylenes J-' N D N D N D N D N D N D <br /> Reporting Limit 050 050 050 050 050 050 <br /> Chromatogram Weathered - <br /> Pattern Gasoline <br /> C6-C12 <br /> Quality Control Data <br /> Date Analyzed 03/26/98 03/26/98 03/26/98 03/26/98 03/26/98 03/26/98 <br /> Instrument Identification GCHP-7 GCHP-7 GCHP-7 GCHP-7 GCHP-7 GCHP-7 <br /> Surrogate Recovery, % 91 94 95 93 100 95 <br /> (QC Limits = 60-140%) <br /> I <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 /> 18SEQU IA ANALYTIC , ELAP #1624 <br /> nda C Schn ider Zzl/ <br /> rolect Manager/Sacramento Laboratory <br /> 8030992 SES <1> <br />