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Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (650) 364 9600 FAX(650)364-9233 <br /> 4 <br /> 404 N Wiget Lane Walnut Creck CA 94598 (510) 988 9600 FAX(510)988-%73 <br /> lill-V Analytical 819 Stinker Avenue Surtc 8 5acramcnto CA 95834 (916) 921 96W FAX(916)921 0100 <br /> Brown and Caldwell Client Project ID Arco #2093, Tracy Sampled Nov 17, 1997 <br /> 3480 Buskirk Avenue Sample Matrix Water Received Nov 19, 1997 <br /> Pleasant Hill, CA 94523 Analysis Method EPA 5030/8015 Mod /8020 Reported Dec 4, 1997 <br /> Attention Steve Misner First Sample # 711-1392 <br /> QC Batch Number GC120197 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Reporting Sample <br /> Analyte Limit i D <br /> pg/L 711-1392 <br /> ATR-8 <br /> Purgeable <br /> Hydrocarbons 50 4,200 <br /> Benzene 050 57 <br /> Toluene 050 N D <br /> Ethyl Benzene 050 N D <br /> Total Xylenes 050 250 <br /> MTBE 25 N D <br /> Chromatogram Pattern Gasoline <br /> Quality Control Data <br /> Report Limit Multiplication Factor 40 <br /> Date Analyzed 12/1/97 <br /> Instrument Identification HP-4 <br /> Surrogate Recovery, % 102 <br /> (QC Limits = 70-130%) <br /> Purgeabie Hydrocarbons are quantitated against a fresh gasoline standard <br /> Analytes reported as N D were not detected above the stated reporting limit <br /> SEQUOIA ANALYTICAL, #1271 <br /> Q <br /> Melissa A Brewer <br /> Client Services Representative <br /> 7111386 BRO <2> <br />