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819 Striker Avenue Suite 8 <br /> 5834 <br /> Sequoia <br /> Sacramento <br /> 921-9600 <br /> FAX (916)921-0100 <br /> Analytical www sequoialabs com <br /> SECOR International-Rancho Cordova Project ARCO 2093,Tracy,CA Sampled 9/29/00 to 10/2/00 <br /> 3017 Kilgore Road, Suite 100 Project Number NIA Received 10/2/00 <br /> Rancho Cordova,CA 95670 Project/Manager Rusty Benkosky Reported 10/16/00 <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 /> Anal a Analyzed level Result Result Units Recov Limits % Limit % Notes* <br /> Batch 0100004 Date Prepared 10/2/00 Extraction Method EPA 5030B McOH <br /> Blank 0100004-BLK1 <br /> Purgeable Hydrocarbons 10/2/00 ND mg/m'Air 100 <br /> Benzene ND 00500 <br /> Toluene ND 00500 <br /> Ethylbenzene ND 00500 <br /> Xylenes(total) ND 00500 <br /> Methyl tent-butyl ether _ ND 0 500 <br /> Surrogate a a a-Trifluorotoluene _ 200 206 600-140 103 <br /> LCS 0100004-BSI <br /> Benzene 10/2/00 200 2 15 mg/m'Air 700-130 108 <br /> Toluene 200 2 05 700-130 102 <br /> Et nzene 200 2 13 700-130 107 <br /> X (total) 600 634 " 700-130 106 <br /> Methyl tert-butyl ether 2 00 2 15 700-130 108 <br /> Surrogate a,a,a-Trifluorotoluene 2 00 2 14 600-140 107 <br /> S Dug 0100004-BSD1 <br /> Benzene 10/2/00 200 207 mgW Air 700-130 103 25 0 4 74 <br /> Toluene 200 206 700-130 103 25 0 0 976 <br /> Ethylbenzene 200 2 14 700-130 107 250 0 <br /> Xylenes(total) 600 639 700-130 106 25 0 0 <br /> Methyl tert-butyl ether 2 00 220 700-130 110 250 _ 1 83 <br /> Surrogate a,a,a-Trifluorotoluene 2 00 2 19 600-140 110 <br /> i <br /> i <br /> I <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and def nitrons <br /> p� Page 5 of 8 <br /> �bt3' <br />