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819 Striker Avenue Suite 8 <br /> Sequoia Sacramento CA 95834 <br /> ID (916)921-9600 <br /> IrAnalytical FAX(916)92 1-0 100 <br /> SECOR International-Sacramento Project ARCO 2093,Tracy,CA Sampled 1/26100 <br /> 9912 Business Park Dr,Ste 100 Project Number NIA Received l/27/00 <br /> Sacramento,CA 95827 Project Manager Rusty Benkosky Reported 2/8100 <br /> Total Purgeable Hydrocarbons(C6-C12), BTEX and MTBE in Air by DHS LUF'C/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Lima Recov RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> Batch 0020028 Date Prepared 1128100 Extraction Method EPA 5030B PIT <br /> Blank 0020028-B LK 1 <br /> Purgeable Hydrocarbons 1/28/00 ND mg/ml Air 100 <br /> Benzene ND 00500 <br /> Toluene ND 00500 <br /> Ethylbenzene ND 00500 <br /> Xylenes(total) ND 00500 <br /> Methyl tert_butyl ether ND__" _ _0 500 _ _ <br /> Surrogate a a a-Trrhuorotoluene 2 00 191 600-140 955 <br /> LCS 0020028-BSI <br /> Benzene 1/28100 200 196 mg/m'Air 70 0430 980 <br /> Toluene 200 1 96 700-130 98 0 <br /> Ethylbenzene 200 195 700-130 975 <br /> �s(total) �- 600 ----` 600 1' - 700-130 100 <br /> tert-butyl ether 200 202 700-130 101 <br /> - — <br /> Surrogate a a a-Trifluorotoluene 200 189 600-140 945 <br /> LCs Dun 0020028-BSDI <br /> Benzene 1/28/00 200 205 mg/ml Air 700-130 102 250 400 <br /> Toluene 200 2 05 700-130 102 25 0 400 <br /> Ethylbenzene 200 195 700-130 975 25 0 0 <br /> Xylenes(total) 600 626 700-130 104 250 392 <br /> Methyl tert-butyl ether 200 1 51 700-130 755 250 289 2 <br /> Surrogate a,a,a-Tri luorotoluene 200 187 600-140 935 <br /> *Re er to end o re ort or text o notes and de rn�trons <br /> Sequoia Analytical-Sacramento f f P f f f <br /> page 4 of 6 <br />