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819 Striker Avenue Suite 8 <br /> Sacramento CA 95834 <br /> 41) equoia (916)921-9600 <br /> FAX(916)921-0100 <br /> Analytical www sequoialabs com <br /> SECOR International-Rancho Cordova Protect ARCO 2093,Tracy,CA Sampled 4/26100 <br /> 3017 Kilgore Road,Suite 100 Project Number N/A Received 4/27/00 <br /> Rancho Cordova,CA 95670 Project Manager Rusty Benkosky Reported 5123/00 <br /> Total Purgeable Hydrocarbons (C6-C12),BTEX and MTBE in Air(ppmv) by DHS LUFT/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov RPD RPB <br /> IAnalyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> Batch 0050002 Date Prepared 4128100 Extraction Method EPA 5030B(MeOH) <br /> Blank 0050002-BLKI <br /> Purgeable Hydrocarbons 4128100 ND ppmv 280 <br /> Benzene ND 00160 <br /> Toluene ND 00130 <br /> Ethylbenzene ND 00120 <br /> Xylenes(total) ND 00120 <br /> Methyl tert-butyl ether _ ND 0 140 <br /> Surrogate a,a a-Trifluorotoluene 000200 0 00208 600-140 104 <br /> Sequoia Analytical-Sacramento *Refer to end of report for test of notes and definitions <br /> Page 6 of 8 <br />