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a � . <br /> Sequoia 819 Striker Avenue, Suite 8 <br /> Sacramento, CA 95834 <br /> (916)921-9600 <br /> Analytical FAX(916)'921-0100 <br /> EMCON-Sac Project: ARCO 2186,Stockton,CA Sampled: 6/11199 <br /> 1433 N. Market Blvd, Project Number: 21775-237-002 Received: 6111199 <br /> Sacramento,CA 95834 Project Manager: Dave Foley Reported: 6/28/99 <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 % Notes` <br /> Batch: 9060342 Date Prepared: 6123199 Extraction Method: EPA 5030B(P/T) <br /> Blan 9060342-BLKI <br /> Purgeable Hydrocarbons 6/23/99 ND ug/l 50.0 <br /> Benzene ND 0.500 <br /> Toluene ND 0.500 <br /> Ethylbenzene ND 0.500 <br /> Xylenes(total) ND 0.500 <br /> Methyl tent-butyl ether NII 5.00 <br /> Surrogate: a,a,a-Trifluorotoluene 10.0 8.88 60.0-140 88.8 <br /> l� 9060342-BSI <br /> Benzene 6123/99 10.0 9.82 ug/l 70.0-130 98.2 <br /> Toluene 10.0 9.96 70.0-130 99.6 <br /> Ethylbenzene 10.0 10.0 70.0-130 100 <br /> X s(total) 30.0 30.2 70.0-130 101 <br /> tent-butyl ether 10.0 12.0 70.0-130 120 <br /> Surrogate: a,a,a-Trifluorotoluene 10.0 9.52 60.0-140 95.2 <br /> Matrix Spike 9060342-MSI S9106203-02 <br /> Benzene 6/23/99 10.0 ND 9.14 ug/l 60.0-140 91.4 <br /> Toluene 10.0 ND 9.43 60,0-140 94.3 <br /> Ethylbenzene " 10,0 ND 9.48 60.0-140 94.8 <br /> Xylenes(total) 30.0 ND 28.4 60.0-140 94.7 <br /> Methyl tent-butyl ether 10.0 ND 13.1 00.0-140 131 <br /> Surrogate: a,a,a-Trriuorotoluene 10.0 9.79 60.0-140 97.9 <br /> Matrix Spike nun - S906203-02 <br /> Benzene 6/23/99 10.0 ND 9.23 ug/l 60,0-140 92.3 25.0 0.980 <br /> Toluene 10.0 ND 9.54 60.0-140 95.4 25.0 1.16 <br /> Ethylbenzene 10.0 ND 9.52 60.0-140 95.2 25.0 0.421 <br /> Xylenes(total) 30.0 ND 28.8 60.0-140 96.0 25.0 1.36 <br /> Methyl tert-butyl ether 10.0 ND 14.0 60.0-140 I40 25.0 6.64 <br /> Surrogate: a,a,a-Tr[iluorotoluene 10.0 9.77 60.0-140 97.7 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> Page 6 of 8 <br /> rR <br />