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819 Striker Avenue Suite 8 <br /> 4DFAXSequoia Sacramento CA 95854 <br /> (916)9zi-9600(916)921-0 100 <br /> Analytical www sequolalabs corn <br /> SECOR International-Rancho Cordova Project ARCO 2133, Stockton,CA Sampled 5125/00 <br /> 3017 Kilgore Road,Suite 100 Project Number N/A Received 5126/00 <br /> Rancho Cordova,CA 95670 Project Manager Rusty Benkosky Reported 619/00 <br /> Total Purgeable Hydrocarbons(C6-C12), BTEX and MTBE in Air by DHS LUFT/Quality Control <br /> Sequoia Analytical- Sacramento <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> lAnalyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> Batch 0050325 Date Prepared 5/26/00 Extraction Method EPA 50308 PIT <br /> Blank 0050325-B LK 1 <br /> Purgeable Hydrocarbons 5/26/00 ND mg/ml Air 100 <br /> Benzene ND 00500 <br /> Toluene ND 00500 <br /> Ethylbenzene ND h00500 <br /> Xylenes(total) ND 00500 <br /> Methyl tert-butyl ether _ ND 0 500 <br /> Surrogate a a a-Trifluorotoluene F 200 2 04 600-140 102 <br /> LCS 0050325-BSI <br /> Benzene 5/26/00 2 00 1 98 mg/ml Air 700-130 99 0 <br /> Toluene 200 2 03 700-130 1.01 <br /> Ethylbenzene 200 2 00 70 0-1.30 1.00 <br /> X�s(total) 600 6 04 " 700-130 101 <br /> tert-butyl ether 2 00 207 700-130 103 <br /> Surrogate a,a,a-Tr fluorotoluene 200 220 600-140 110 <br /> LCS Dua 0050325-BSDI <br /> Benzene 5/26/00 200 1 98 mg/ml Air 700-130 990 25 0 0 <br /> Toluene 2 00 200 700-130 100 25 0 0 995 <br /> Ethylbenzene 2 00 1 98 700-130 990 25 0 101 <br /> Xylenes(total) 6 00 595 700-130 992 25 0 180 <br /> Methyl tert-butyl ether _ _ 2 00 227 70 0430 113 250 926 <br /> Surrogate a,a,a-Trefluorololuene 200 1 17 600-140 109 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions <br /> Page 4 of 6 <br /> I <br />