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Sequoia n6,,Chesapeake Drive Redwood City,CA 940(") (415) 364-9600 FAX(415) 364-9233 <br /> 404 N.Wiget Lane Walnut Creek,CA 94598 (510) 988-9600 FAX(510)988-9673 <br /> Analytical 8F9 Striker Avenue,Suite 8 Sacrariento,CA 95834 (916) 921-9600 FAX(916)921-0100 <br /> SECOR International Project: ARCO 4493,Stockton,CA Sampled: 7/28/98 <br /> 9912 Business Park Drive,Ste. 100 Project Number: N/A Received: 7/28/98 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosk Reported: 8/11/98 <br /> iTo�td Purgeable=Hydrocarbons'(C6 C�12},:BTEX and�iVFIBE�6yM1 'LUF"IAJ 'A , Control <br /> lx <br /> Sequoia Analytical Sacramento a. <br /> a ° , <br /> 3 <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov.Limits % Limit % Notes* <br /> Batch: 8080035 Qate Prepared: 814198 Extraction Method: EPA 5030B(P/T) <br /> Blau 8080035-BLK1 <br /> Purgeable Hydrocarbons 8/4/98 ND ug/1 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 5.00 <br /> Surrogate: a,a,a-Trifluorotoluene 10.0 9.24 60.0-140 92.4 <br /> jCS 8080035-BSI <br /> Benzene 814/98 10.0 10.0 ug/l 70.0-130 100 <br /> Toluene 10.0 9.52 70.0-130 95.2 <br /> Ethylbenzene 10.0 9.36 70.0-130 93.6 <br /> Xylenes(total) 30.0 27.9 70.0-130 93.0 <br /> Methyl tert-butyl ether 10.0 111.1 70.0-130 111 <br /> Surrogate: a,a,a-Trifluorotoluene 10.0 9.15 60.0-140 91.5 <br /> Matrix 511ft 8080035-MSI 5807332-01 <br /> Benzene 8/4/98 10.0 ND 9.99 ug/1 60.0-140 99.9 <br /> Toluene 10.0 ND 9.36 60.0-140 93.6 <br /> Ethylbenzene 10.0 ND 9.34 60.0-140 93.4 <br /> Xylenes(total) 30.0 ND 27.9 60.0-140 93.0 <br /> Methyl tert-butyl ether 10.0 ND 112.8 60.0-140 128 <br /> Surrogate: a,a,a-Tris luorololuene 10.0 9.03 60.0-140 90.3 <br /> Matrix Spike Dun 8086035-MSD1 5807332-01 <br /> Benzene 8/4/98 10.0 ND 10.2 ug/1 60.0-140 102 25.0 2.08 <br /> Toluene 10.0 ND 9.48 60.0-140 94.8 . 25.0 117 <br /> Ethylbenzene 10.0 ND 9.38 60.0-140 93.8 25.0 0.427 <br /> Xylenes(total) 30.0 ND 28.0 60.0-140 93.3 25.0 0.322 <br /> Methyl tert-butyl ether 10.0 ND 12.7 60.0-140 127 25.0 0.784 <br /> Surrogate: a,a,a-Trifluorotoluene 10.0 7.98 60.0-140 79.8 <br /> Batch: 8080053 Date Prepared: 814198 Extraction Metbod: EPA 5030B(Pff) <br /> Blan 8080053-BLKI <br /> Purgeable Hydrocarbons 8/4/98 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 " 5.00 <br /> Sequoia Analytical-Sacramento *Refer to end of report for test of notes and definitions. <br /> inda C. Scanei er,Laboratory Director Page 3 of 5 <br />