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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 /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 oioo <br /> SECOR Client Project ID ARCO 2133, Stockton, CA Sampled Mar 20 1998 <br /> 3050 Fate 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# 803-1011 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS wtth BTEX DISTINCTION <br /> Sample <br /> Analyte Units Results <br /> pg/L 803-1011 <br /> E-10 <br /> Purgeable 7,300 <br /> Hydrocarbons Reporting Limit 2 500 <br /> Benzene 2,000 <br /> Reporting Limit 25 <br /> Toluene 68 <br /> Reporting Limit 25 <br /> Ethyl Benzene 350 <br /> Reporting Limit 25 <br /> • Total Xylenes 11 260 <br /> Reporting Limit 25 <br /> Chromatogram Weathered <br /> Pattern Gasoline <br /> C6-C12 <br /> Quality Control Data <br /> Date Analyzed 03/31/98 <br /> instrument identification GCHP-2 <br /> Surrogate Recovery, % 98 <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 /> 0SEQU A A <br /> NALYT <br /> ICA ELAP #1624 <br /> Schneider <br /> ro <br /> roject Manager/Sacramento Laboratory <br /> 8030992SES <5> <br />