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Sequoia 819 Striker Avenue Suite 8 <br /> Sacramento,CA 95834 <br /> (9 16)921-9600 <br /> � Analytical FAX(91 jo 9abs.co 0 <br /> www.sequolalabs.com <br /> • <br /> SECOR International-Rancho Cordova Project: ARCO 4493, Stockton,CA Sampled: 5/8100 <br /> 3017 Kilgore Road,Suite 100 Project Number: N/A Received: 5/10/00 <br /> Rancho Cordova,CA 95670 Project Manager: Rusty Benkosky Reported: 5/18/00 <br /> Total,Eurgeable,Hy-drocarbons.(C6_C12),.BTEX and MTBE,by_DHS_LUETLQuality_Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Anal c <br /> Analyzed Level Result Result Units Recov.Limits % Limit % Notes* <br /> Batch: 0050133 Date Prepared: 5/15100 Extractions Method: EPA 5030B(MeOH) <br /> Blank 0050133-BLKI <br /> Purgeable Hydrocarbons 5115100 ND ug/l 50.0 <br /> Benzene ND 0.500 <br /> Toluene ND 0.500 <br /> Ethylbenzene ND 0.500 <br /> Xylenes(total) ND 0.500 <br /> Methyl tert-butyl ether ND 2.50 <br /> Surrogate: a,a,a-Triuorotoluene 10.0 8.88 60.0-140 88.8 <br /> LCS 0050133-BSI <br /> Benzene 5115/00 10.0 9.83 ug/l 70.0-130 98.3 <br /> Toluene 10.0 9.76 70.0-130 97.6 <br /> Ethylbenzene 10.0 9.82 70.0-130 98.2 <br /> Xylenes(total) 30-0 29.2 70.0-130 97.3 <br /> Methyl tert-butyl ether 10.0 9.33 70.0-130 93.3 <br /> Surrogate: a,a,a-Trifluorotoluene 10.0 8.69 60.0-140 86.9 <br /> Matrix Spike 0050133-MSI S005173-12 <br /> .Benzene 5/.15/00�10.0�ND�10:4�ug/l�60.0-140T104 .. - <br /> Toluene 10.0 ND 10.3 60.0-140 203 <br /> Effiylbenzene 10.0 ND 10.3 60.0-140 103 <br /> Xylenes(total) 30.0 ND 30.8 60.0-140 103 <br /> Methyl tert-butyl ether 10.0 ND 10.6 60.0-140 106 <br /> Surrogate: a,a,a-Trifluorotoluene " 10.0 9.36 60.0-140 93.6 <br /> Matrix Spike Dup 0050133-MSD1 5005173-12 <br /> Benzene 5115100 10.0 ND 9.97 ug/l 60.0-140 99.7 25.0 4.22 <br /> Toluene 10.0 ND 10.1 60.0-140 101 25.0 1.96 <br /> Ethylbenzene 10.0 ND 10.I 60.0-140 101 25.0 1.96 <br /> Xylenes(total) " 30.0 ND 29.5 60.0-140 983 25.0 4.67 <br /> Methyl cert-butyl ether 10.0 ND 7.15 60.0-140 71.5 25.0 38.9 3 <br /> Surrogate: a,a,a-Triuorotoluene 10.0 8.93 60.0-140 89.3 <br /> Batch: 0050160 Date Prepared: 5116_/00_ Extraction Method: EPA 5030E(MeOHI <br /> lank 0050160-BLK1 <br /> Purgeable Hydrocarbons 5/16/00 ND ug/l 50.0 <br /> Benzene ND 0.500 <br /> Toluene ND 0.500 <br /> Ethylbenzenc " ND 0.500 <br /> Xylenes(total) " ND 0.500 <br /> Methyl tert-butyl ether ND 2.50 Adk <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> Page 13 of 22 <br />