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819 Striker Avenue Suite 8 <br /> Sequoia Sacramento C95834 <br /> a- ) (916)921-9600 1-9600 <br /> FAX(916)921-0 100 <br /> rF <br /> Analytical www sequoialabs com <br /> rSECOR International-Rancho Cordova Project ARCO 595,Stockton,CA Sampled 6/t/00 to 6/6/00 <br /> 3017 Kilgore Road,Suite 100 Project Number N/A Received 6/8/00 <br /> Rancho Cordova,CA 95670 Project Manager Rusty Benkosky Re orted 6/19/00 <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 /> IAnalyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> Matrix Spike[continued} 0060148-MSI 5006136-01 <br /> Xylenes(total) 6/14/00 0 600 ND 0 445 mg/kg 600-140 742 <br /> Methyl tert-butyl ether 0200 ND 0 133 600-140 665 <br /> Surrogate a,a,a-Trtfluorotoluene 0200 0 194 600-140 970 <br /> Matrix Spike Dup 0060148-MSD1 5006136-01 <br /> Benzene 6/14/00 0200 ND 0 148 mg/kg 600-140 740 25 0 136 <br /> Toluene 0200 ND 0 156 600-140 780 25 0 731 <br /> Ethylbenzene 0200 ND 0 155 600-140 775 25 0 195 <br /> Xylenes(total) 0 600 ND 0 453 600-140 755 25 0 174 <br /> Methyl tert-butyl ether 0200 ND 0 139 600-140 695 25 0 4 41 <br /> Surrogate a a a-Trefluorotoluene 0200 0 195 600-140 975 <br /> Batch 0060149 Date Prepared 6/14/00 Extraction Method EPA 5030E McOH <br /> 0060149-BLK 1 <br /> P ble Hydrocarbons 6/14/00 ND mg/kg 100 <br /> Benzene ND 000500 <br /> Toluene ND 000500 <br /> Ethylbenzene ND 000500 <br /> Xylenes(total) ND 000500 <br /> Methyl tert-butyl ether ND 00500 _ <br /> Surrogate a,a,a-Trifluorotoluene 0200 0 234 600-140 117 <br /> LCS 0060149-BSI <br /> Benzene 6114/00 0200 0 219 mg/kg 700-130 109 <br /> Toluene 0200 0 220 700-130 110 <br /> Ethylbenzene 0200 0 213 700-130 106 <br /> Xylenes(total) 0 600 0 585 700-130 975 <br /> Methyl tert-butyl ether 0200 0 217 700-130 108 <br /> Surrogate a aa-Trifluorotoluene 0200 0 237 600-140 118 <br /> Matrix Spike 0060149-MSI 5006136-07 <br /> Benzene 6/14/00 0200 ND 0 161 mg/kg 600-140 805 <br /> Toluene " 0200 ND 0 165 600-140 825 <br /> Ethylbenzene 0200 ND 0 161 600-140 805 <br /> Xylenes(total) 0 600 ND 0 448 600-140 747 <br /> Methyl tert-butyl ether 0200 ND 0 218 600-140 109 <br /> Surrogate a,a a-Trrfluorotoluene 0200 0 234 600-140 117 <br /> Matrix Spike Dup 0060149-MSDI S006136-07 <br /> Benzene 6/14/00 0200 ND 0 161 mg/kg 600-140 805 250 0 <br /> TINe 0200 ND 0 167 600-140 835 250 120 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions <br /> Page 23 of 27 <br />