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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Crick CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> X111 Analytical 819 Sinker Avenue Suitc 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 # 708-0666 <br /> oC Batch Number GC081897 GCO81897 GC081897 GCO81897 GCO81897 GCO81897 <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 I D I D I D I D I D I D <br /> erg/L 708-0666 708-0667 708-0668 708-0669 708-0670 708-0671 <br /> ATR-7 ATR-2 ATR-5 ATR-4 ATR-3 ATR-8 <br /> Purgeable <br /> Hydrocarbons 50 N D N D 220 320 3,400 7,800 <br /> Benzene 050 N D N D 3 4 24 20 280 <br /> Toluene 050 N D N D 060 1 1 N D 75 <br /> Ethyl Benzene 050 N D N D N D N D 160 140 <br /> Total Xylenes 050 N D N D N D 057 110 710 <br /> MTBE 25 22 440 69 63 N D N D <br /> Chromatogram Pattern -- Gasoline& Gasoline& Gasoline Gasoline <br /> Unidentified Unidentified <br /> Quality Control Data Hydro <C7 Hydro <C7 <br /> Report Limit Multiplication Factor 1 0 1 0 1 0 1 0 20 10 <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, % 101 103 98 98 96 90 <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 /> Melissa A Brewer <br /> Client Services Representative <br /> 7080660 BRQ <2> <br />