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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 96W FAX(415) 364 9233 <br /> 404 N Wiget lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Susie 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> rown and Caldwell Client Project ID Arco #2093, Tracy Sampled Aug 11, 1997 <br /> 3480 Buskirk Avenue Sample Matrix Water Received Aug 12, 1997 <br /> Pleasant Hill, CA 94523 Analysis Method EPA 5030/8015 Mod /8020 Reported Aug 26, 1997 <br /> Attention Steve Misner First Sample # 708-0660 <br /> OC Batch Number GCO81897 GC081897 GC081897 GC081897 GCO81897 GC081897 <br /> 802004A 802004A 802004A 802004A 802004A 802004A <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Reporting Sample Sample Sample Sample Sample Sample <br /> Analyte Limit ID ID 1D ID 1D ID <br /> pg/L 708-0660 708-0661 708-0662 708-0663 708-0664 708-0665 <br /> ATR-9 ATR-10 ATR-12 ATR-11 ATR-1 ATR-6 <br /> Purgeable <br /> Hydrocarbons 50 N D N D N D N D N D N D <br /> Benzene 050 N D N D N D N D N D N D <br /> Toluene 0 50 N D N D N D N D N D N D <br /> Ethyl Benzene 050 N D N D N D N D N D N D <br /> Is Total Xylenes 050 N D N D N D N D N D N D <br /> MTBE 25 ND ND ND ND 23 56 <br /> Chromatogram Pattern __ __ _- .. -- <br /> Quality <br /> _Quality Control Data <br /> Report Limit Multiplication Factor 1 0 1 0 1 0 1 0 1 0 1 0 <br /> Date Analyzed 8/18/97 8/18/97 8/18/97 8/18/97 8/18/97 8/18/97 <br /> Instrument Identification HP-4 HP-4 HP-4 HP-4 HP-4 HP-4 <br /> Surrogate Recovery, % 101 101 102 101 101 102 <br /> (QC Limits = 70-130%) <br /> Purgeable Hydrocarbons are quantitated against a fresh gasoline standard <br /> Analytes reported as N 0 were not detected above the stated reporting limit <br /> SEQUOIA ANALYTICAL, #1271 <br /> Q <br /> Melissa A Brewer <br /> Client Services Representative <br /> 7080660 Bayo <1> <br />