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819 Striker Avenue Suite 8 <br /> Sequoia Sacramento CA <br /> 5834 <br /> (916)921-9600-96W <br /> 4(i) <br /> FAX (916)921-0 100 <br /> Analytical www sequoialabs com <br /> WF <br /> SECOR International-Rancho Cordova Project ARCO 2093,Tracy,CA Sampled 4/26100 <br /> 3017 Kilgore Road,Suite 100 Project Number NIA Received 4/27100 <br /> Rancho Cordova,CA 95670 Project Manager Rusty Benkosky Re orted 5123100 <br /> Total Purgeable Hydrocarbons(C6-Cl2), 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 /> lAnaiyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> Batch 0050002 Date Prepared 4/28100 Extraction Method EPA 5030B McOH <br /> Blank 0050002-BLK1 <br /> Purgeable Hydrocarbons 4128/00 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-Trifluorotoluene 2 00 208 600-140 104 <br /> LCS 0050002-BSI <br /> Benzene 4/28100 200 2 11 mg/m'Air 70 0-130 105 <br /> Toluene 2 00 2 08 700-130 104 <br /> Ethylbenzene. 200 206 700-130 103 <br /> X (total) 600 - 670 i; 700-130 112 —� <br /> tert-butyl ether 200 1 59 700-130 795 <br /> Surrogate a a,a-Trii luorotoluene 200 208 600-140 104 <br /> LCS Duo 0050002-BSD1 <br /> Benzene 4/28/00 200 218 mg/ml Air 700-130 109 25 0 374 <br /> Toluene 200 2 14 1. 700-130 107 250 2 84 <br /> Ethylbenzene 2 00 2 13 700-130 107 25 0 3 81 <br /> Xylenes(total) 600 693 700-130 115 25 0 264 <br /> Methyl tert-butyl ether 200 2 16 700-130 108 25 0 304 3 <br /> Surrogate a,a,a-Tr�rtarotoluene 2 00 214 600-140 107 <br /> • *Refer to end of report for text of notes and def nit:ons <br /> Sequoia Analytical-Sacramento <br /> Page 5 of 8 <br />