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819 Striker Avenue Suite 8 <br /> 1 <br /> Sequoia <br /> Sacramento 095834 <br /> J (916)922!-9600 <br /> FAX (916)921-0100 <br /> Analytical wvrw seguoialabs`om <br /> 80 <br /> SECOR International-Rancho Cordova Project ARCO 2093,Tracy,CA Sampled 5/25/00 <br /> 3017 Kilgore Road,Suite 100 Project Number N/A Received 5/26/00 <br /> Rancho Cordova,CA 95670 Project Manager Rusty Benkosky Reported 6/13100 <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 /> Analyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> Batch 0050325 Date Prepared 5/26100 Extraction Method EPA 5030B(PIT) <br /> Blank 0050325-BLK1 <br /> Purgeable Hydrocarbons 5126/00 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-Trifluorololuene _ 200 2 04 600-140 102 <br /> LCS 0050325-BSI <br /> Benzene 5126100 200 1 98 mg/ml Air 700-130 990 <br /> Toluene 200 2 03 700-130 101 <br /> Eth /benzene 200 200 700-130 100 <br /> s(total) " 600 604 " 700-130 101 — - <br /> 1 tert-butyl ether 2 00 207 700-130 103 <br /> Surrogate a a a-Trifluorotoluene 2 00 220 600-140 110 <br /> LCS Dua 0050325-BSDI <br /> Benzene 5126100 200 1 98 mg/ml Air 700-130 990 250 0 <br /> Toluene 200 200 700-130 100 250 0 995 <br /> Ethylbenzene 200 198 700-130 990 25 0 101 <br /> Xylenes(total) 600 595 700-130 992 25 0 180 <br /> _Methyl tett-butyl ether 2 00 2 27 70 0-130 113 250 926 <br /> Surrogate a,a,a-Trifluorotoluene 200 2 17 600-140 109 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of nates and definitions <br /> Page 5 of 8 <br />