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Sequoia_ 680 Chesapeakc Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> (D— � 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 0100 <br /> EMCON Client Project ID ARCO 548 Stockton CA Sampled Nov 18 1997 <br /> 1433 N Market Blvd Sample Matrix Water Received Nov 20 1997 <br /> Sacramento CA 95834 Analysis Method EPA 5030/8020 DHS Luft Reported Dec 8 1997 <br /> Attention Deanna Santos First Sample # 711-1184 <br /> TOTAL PURGEABLE_PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Sample Sample Sample Sampie- Sample Sampie <br /> Analyte Units Resuits Results Results Results- Results Results <br /> ug/L 711-1184 711-1185 711-1186 711-1187 711-1188 711-1189 <br /> MW-1 (56) MW-2 (61) MW-3(62) MW-4(64) MW-5 (61) MW-6(57) <br /> Purgeable 180 N D N D N D 1 300 54 <br /> Hydrocarbons Reporting Limit 50 50 50 50 250 50 <br /> Benzene 15 26 15 45 180 59 <br /> Reporting Limit 050 050 050 050 25 050 <br /> Toluene 1 3 1 4 087 25 12 58 _ <br /> Reporting Limit 050 050 050 050 25 050 <br /> Ethyl Benzene 10 065 N D 091 18 1 6 <br /> Reporting Limit 050 050 050 050 25 050 <br /> Total Xylenes 14 1 5 068 21 88 92 <br /> Reporting Limit 050 050 050 050 25 050 <br /> Chromatogram Weathered - - Gasoline Weathered <br /> Pattern Gasoline C6-C12 Gasoline <br /> CS-C112 G6-G12 <br /> Quality Control Data <br /> Date Analyzed 12/01/97 12/01/97 12/01/97 12/01/97 12/02/97 12/01/97 <br /> Instrument Identification GCHP-7 GCHP-7 GCHP-7 GCHP-7 GCHP-7 GCHP-7 <br /> Surrogate Recovery, % 93 90 90 92 84 92 <br /> (QC Limits = 60-140%) <br /> Purgeable Hydrocarbons are quantitated against afresh gasoline standard <br /> Anaiytes reported as N 0 were not detected at or above the reporting limit <br /> SEQUOIA ANALYTICAL, ELAP #1624 <br /> • ��� &Y. <br /> da C Schneider <br /> rolect Manager/Sacramento Laboratory <br /> 7111184 EMG <1> <br />