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Sequoia 819 Striker Avenue Suite 8 <br /> Sacramento CA 95834 <br /> (916) 921-9600 <br /> Analytical <br /> FAX(9 16) 92 1-0100 <br /> IS <br /> m <br /> ECOR International-Sacramento Project ARCO 595, Stockton,CA Sapled 9/10/99 to 9/14/99 <br /> 912 Business Park Dr,Ste 100 Project Number NIA Received 9/15/99 <br /> acramento,CA 95827 Project Manager Rusty Benkosky Reported 9/27/99 <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 9090220 Date Prepared 9121/99 Extraction Method EPA 50308 McOH <br /> Blank 9090220-BLK 1 <br /> Purgeable Hydrocarbons 9/21/99 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 0 211 600-140 105 <br /> LCS 9090220-BS 1 <br /> Benzene 9/21/99 0200 0 212 mg/kg 700-130 106 <br /> Toluene 0200 0204 700-130 102 <br /> Ethylbenzene 0200 0 211 700-130 105 <br /> �es(total) 0 600 0 567 700-130 945 <br /> 1 tert-butyl ether 0200 0 171 700-130 855 <br /> Surrogate a a a-Trifluorotoluene 0200 0 217 600-140 108 <br /> Matrix Spike 9090220-MSI S909240-12 <br /> Benzene 9/21/99 0200 ND 0 174 mg/kg 600-140 870 <br /> Toluene 0200 ND 0 176 600-140 880 <br /> Ethylbenzene 0200 ND 0 182 600-140 910 <br /> Xylenes(total) 0 600 ND 0 503 600-140 838 <br /> Methyl tert-butyl ether 0200 ND 0 153 " 600-140 765 — --- <br /> Surrogate a a a-Trifluorotoluene 0200 0 231 600-140 116 <br /> Matrix Spike Dun 9090220-MSD1 S909240-12 <br /> Benzene 9/21/99 0200 ND 0 180 mg/kg 600-140 900 250 339 <br /> Toluene 0200 ND 0 173 600-140 865 25 0 1 72 <br /> Ethylbenzene 0200 ND 0 186 600-140 93 0 25 0 2 17 <br /> Xylenes(total) 0 600 ND 0 514 600-140 857 250 224 <br /> Methyl tert-butyl ether __ 0_200 --- ND 0 153 600-140 765 _ 250 F 0 <br /> Surrogate a a a-Trifluorotoluene 0200 0 231 600-140 116 <br /> Batch 9090227 Date Prepared 9/22199 Extraction Method EPA 5030B(MeOH) <br /> Blank 9090227-BLK/ <br /> Purgeable Hydrocarbons 9/22/99 ND mg/kg 100 <br /> Benzene ND 000500 <br /> Toluene ND 000500 <br /> Ethylbenzene ND 000500 <br /> Xylenes(total) ND 000500 <br /> M&Lbyl tert-butyl ether ND 00500 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions <br /> Page 14 of 19 <br />