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K 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 /> ,%W Analytical 819 Stnker Avenue Suite a Sacramento CA 95834 (916) 921 96W FAX(916)921 0100 <br />*Brawn 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# 711-1386 <br /> OC Batch Number GC112697 GC112697 GC112697 GC112697 GC 112697 h A GC120297 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with$BTEX DISTINCTION 802004A <br /> Reporting Sample Sample Sample Sample Sample Sample <br /> Analyte Limit I D I D I D I.D I D I D <br /> pg/L 711-1386 711-1387 711-1388 711-1389 711-1390 711-1391 <br /> ATR-12 ATR-7 ATR-2 ATR-5 ATR-4 SMW-1 <br /> Purgeable <br /> Hydrocarbons 50 N D N D N D 190 420 N D <br /> Benzene 050 N D N D N D 2 8 33 N D <br /> Toluene 050 N D N D N D 0 65 14 N D <br /> Ethyl Benzene 050 N D N D N D N D N D N D <br /> Total Xylenes 050 N D N D N D N D 0 76 N D <br /> MTBE 25 N D 35 98 51 4 8 290 <br /> Chromatogram Pattern -- Gasoline& Gasoline& - <br /> Unidentified Unidentified <br /> Hydrocarbons Hydrocarbons <br /> Quality Control Data <C7 <C7 <br /> Report Limit Multiplication Factor 10 10 10 1 0 10 20 <br /> Date Analyzed 11/26/97 11/26/97 11/26/97 11/26/97 11/26/97 12/2/97 <br /> Instrument Identification HP-4 HP-4 HP-4 HP-4 HP-4 HP-4 <br /> Surrogate Recovery, % 107 107 108 103 100 103 <br /> (OC Limits = 70-130%) <br /> Purgeable Hydrocarbons are quantitated against a fresh gasoline standard <br /> Anaiytes reported as N D were not detected above the stated reporting limit <br /> SEQUOIA ANALYTICAL, #1271 <br /> bv\,L� <br /> Melissa A Brewer <br /> Client Services Representative <br /> 7111386 SRO <1 n <br />