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819 Striker Avenue Suite 8 <br /> Sacramento CA 95834 <br /> ' Sequoia (916)921-9600 <br /> fAX(91 G)92 1-0 100 <br /> Analytical www sequoialabs com <br /> SECOR International-Rancho Cordova Project ARCO 2093,Tracy,CA Sampled 5/25/00 <br /> 3017 Kilgore Road,Suite 100 Project Number NIA Received 5126/00 <br /> Rancho Cordova,CA 95670 Project Manager Rusty Benkosky Reported 6/13/00 <br /> Total Purgeable Hydrocarbons (C6-Cl2), BTEX and MTBE to Air(ppmv) by DHS LUFT/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Bate Spike Sample QC Reporting Limit Recov RPD RPD <br /> Anal a Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> Batch 0050325 Date Prepared 5/26/00 Extraction Method EPA 50305 PIT <br /> Blank 0050325-BLK 1 <br /> Purgeable Hydrocarbons 5/26/00 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-Tris luorotoluene 000200 000204 600-140 102 <br /> 0 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and def ntttons <br /> page 6 of 8 <br />