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Striker Avenue Suite 8 <br /> 4 41) Sequoia 819Sacramento CA 95834 <br /> 7 (916)921-9600 <br /> IwoAnalytical FAX(9 16)921-0 100 <br /> I <br /> EMCON-Sac Project ARCO 2130,Stockton,CA Sampled 614199 to 616199 <br /> 1433 N Market Blvd Project Number 21775-229 004 Received 6/7/99 <br /> Sacramento,CA 95834 Project Manager Dave Foley Reported 6127199 <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 Resutt Result Units Recov Limits % Limit % Notes` <br /> L,CS(continued) 9060224-BSI <br /> Methyl tent-butyl ether 6/18199 100 9 01 ug/l 700-130 90 1 <br /> Surrogate a a a-Trifluorotoluene 11100 101 600-140 101 <br /> Matrix Spik 0460224-MSI. 906114-07 <br /> Benzene 6118199 100 ND 9 76 ug/l 600-140 976 <br /> Toluene 100 ND 9 85 600-140 985 <br /> Ethylbenzene 100 ND 9 91 600-140 99 1 <br /> Xylenes(total) 300 ND 294 600-140 980 <br /> Methyl tert-butyl ether ]Go ND 121 600-140 121 <br /> Surrogate a a a-Triuorotoluene 100 938 600-140 938 <br /> Matrix Spike Duo 9060224-MSD1 S906114-07 <br /> Benzene r 6/18199 100 ND 995 ug/l 600-140 995 250 193 <br /> ene 100 ND 100 600-140 100 250 1 51 <br /> lbenzene 100 ND 100 600-140 100 25 0 0 904 <br /> ylenes(total) 300 ND 299 600-140 997 25 0 1 72 <br /> Methyl tert-butyl ether 100 ND 13 5 600-140 135 25 0 109 <br /> .Surrogate a,a,a-Trifluorotoluene 100 102 600-140 102 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions <br /> Page 8 of I 1 <br />