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Sequoia 819 Striker Avenue Suite 8 <br /> Sacramento CA 95834 <br /> (916)921-9600 <br /> Analytical FAX`916' 0100 <br /> WWW Secluolalal)S com <br /> CON/IT-Sacramento Project ARCO 548,Stockton, CA Sampled 3/28/00 <br /> 1433 N Market Blvd,#1 Project Number 806778 Received 3/31/00 <br /> Sacramento,CA 95834 Project Manager Dave Foley Reported 4110/00 <br /> Total Purgeable Hydrocarbons(C6-C12), BTEX and MTBE by DHS LUFT/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov limits % Limit % Nates* <br /> Batch 0040090 Date Prepared 4/7100 Extraction Method EPA 5030B(MeOH) <br /> Blank 0040090-BLKI <br /> Purgeable Hydrocarbons 417100 ND ug/l 500 <br /> Benzene ND 0 500 <br /> Toluene ND 0 500 <br /> Ethylbenzene ND 0 500 <br /> Xylenes(total) ND 0 500 <br /> Methyl tert-butyl ether ND 250 <br /> Surrogate a,a a-Trifluorotoluene 100 987 600-140 98 7 <br /> LCS 0040090-BS1 <br /> Benzene 4/7/00 too 875 ug/1 700-130 875 <br /> Toluene 100 892 700-130 892 <br /> Ethylbenzene 100 8 88 700-130 888 <br /> Xylenes(total) 300 265 700-130 883 <br /> Methyl tert-butyl ether 100 8 00 700-130 800 <br /> IVogate a a a-Trifluorotoluene 100 953 600-140 953 <br /> Matrix Spike 0040090-MSI 5003406-03 <br /> Benzene 4/7/00 loo ND 9 16 ug/1 600-140 916 <br /> Toluene 100 ND 9 18 600-140 91 8 <br /> Ethylbenzene 10 0 ND 9 35 600-140 935 <br /> Xylenes(total) 300 ND 28 0 600-140 933 <br /> Methyl ter[-butyl ether 100 ND 9 03 600-140 903 <br /> Surrogate a o,a-Triuorotoluene 100 100 600-140 100 <br /> Matrix Spike DuP 0040090-MSD1 5003406-03 <br /> Benzene 417/00 100 ND 9 19 ug/I 600-140 919 250 0 327 <br /> Toluene 100 ND 930 600-140 930 25 0 130 <br /> Etbylbenzene 100 ND 947 600-140 947 250 128 <br /> Xylenes(total) 300 ND 279 600-140 93 0 250 0 322 <br /> Methyl tent-butyl ether 100 ND 8 14 600-140 81 4 250 10 4 <br /> Surrogate a,a,a-Trifluorotoluene 100 974 600-140 974 <br /> oia Analytical-Sacramento *Refer to end of report for text of notes and definitions <br /> Page 4 of 5 <br />