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Sequoia 819 Striker Avenue, Suite 8 <br /> 958 <br /> ID Sacramento,CA 95834 <br /> � Analytical (916)921-9600 <br /> FAX(916)921-d1 QO <br /> EMCON/IT-Sacramento Project: ARCO 2186, Stockton,CA Sampled: 1213199 <br /> 1433 N.Market Blvd.,#1 Project Number: 792232 Received: 1216/99 <br /> Sacramento,CA 95834 Project Manager: Dave Foley Reported: 12/20/99 <br /> Totgl Purgeable Hydrocarbons(C6-02), 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 % Notes* <br /> Blank(continued) 97.20173-BLK1 <br /> Surrogate: a,a a-Trifluorotoluene 12/14/99 10.0 10.1 ugll 60.0-140 101 <br /> LCS 9120173-BSI <br /> Benzene 12/14/99 I0.0 8.94 ug/l 70.0-130 89.4 <br /> Toluene 1. 10.0 9.33 70.0-130 93.3 <br /> Ethylbenzene 10.0 9.20 70.0-130 92.0 <br /> Xylenes(total) 30.0 27.7 70.0-1.30 92.3 <br /> Methyl tert-butyl ether it 10.0 8.27 70.0-130 82.7 <br /> Surrogate: a,a,a-Trifluorotoluene 10.0 9.8.1 60.0-140 98.4 <br /> Matrix Spike 9120173-MSI S912070-01 <br /> Benzene 12/14/99 10.0 2.81 11.4 ug/l 60.0-140 85.9 <br /> Toluene " 10.0 ND 8.96 60.0-140 89.6 <br /> Etb benzene 10.0 ND 9.26 60.0-140 92.6 <br /> (total) 30.0 ND 28.0 60.0-140 93.3 <br /> M _l tert-butyl ether 10.0 ND 10.5 60.0-140 105 <br /> Surrogate: a.a,a-Trifluorotoluene 10.0 9.22 60.0-140 92.2 <br /> Matrix Spike Dup 9120173-MSD1 S912070-01 <br /> Benzene 12/14/99 10.0 2.81 11.5 ug/l 60.0-140 86.9 25.0 1.16 <br /> Toluene 10.0 ND 8.85 60.0-140 88.5 25.0 1.24 <br /> Ethylbenzene 10.0 ND 9.19 60.0-140 91.9 25.0 0.759 <br /> Xylenes(total) 30.0 ND 27.8 60.0-140 92.7 25.0 0.645 <br /> Methyl tert-butyl ether 10.0 ND 10.7 " 60.0-140 107 25.0 1.89 <br /> Surrogate: a,a,a-Tris luorotoluene 10.0 9.24 60.0-140 92.4 <br /> SeJWa Analytical-Sacramento Refer to end of report for text ofnotes and definitions. <br /> Page 6 of 9 <br /> V <br />