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r <br /> ` Sequoia 819 Striker Avenue, Suite 8 <br /> Sacramento. CA 95834 <br /> (916)921-9600 <br /> Analytical FAX(916) 921-0100 <br /> SECOR International Project: ARCO 4493,Stockton,CA Sampled: 6/17199 <br /> 9912 Business Park Drive,Ste. 100 Project Number: 7G600-604-02 Received: 6/17/99 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 7/6/99 <br /> Volatile Oxygenate Compounds by EPA Method 8260AIQuality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD RAD <br /> Analyte Analyzed Level Result Result Units Recov. Limits % Limit % Notes* <br /> Batch: 9Q60306 nate Prepared; 6/21199 Extracdon Method: EPA 5030B[PIT) <br /> blank 9069 136-BLK1 <br /> Tert-butyl alcohol 6/21/99 ND ug/l 200 <br /> Methyl tert-butyl ether ND 2.00 <br /> Di-isopropyl ether ND 2.00 <br /> Ethyl tert-butyl ether " ND " 2.00 <br /> Tert-amyl methyl ether ND 2.00 <br /> 1,2-Dichloroethane ND 2.00 <br /> Surrogate: 1,2-DCA-d4 50.0 52.2 60.0-140 104 <br /> LCS 906Q306-BSI <br /> Methyl Cert-butyl ether 6/21/99 50.0 62.2 ug/l 70.0-130 124 <br /> Surrogate: 1,2-DCA-d4 50.0 54.6 60.0-140 109 <br /> 9060306-BSD1 <br /> Met yl tert-butyl ether 6/21/99 50.0 58.4 ug/l 70.0-130 117 25.0 5.81 <br /> Surrogate: 1,2-DCA-d4 T 50.0 52.4 11 60.0-140 105 <br /> Batch: 90hQ372 Date Prepared: 6124199 Extraction Method: EPA 5030B JP/TT <br /> blank 9Q60372-BLKI <br /> Tert-butyl alcohol 6/24/99 ND ug/l 200 <br /> Methyl tert-butyl ether ND 2.00 <br /> Di-isopropyl ether ND 2.00 <br /> Ethyl tert-butyl ether ND 2.00 <br /> Tert-amyl methyl ether ND 2.00 <br /> 1,2-Dichloroethane ND 2.00 <br /> Surrogate. 1,2-DCA-d4 50.0 49.8 60.0-140 99.6 <br /> LCS 2060372-BST <br /> Methyl tert-butyl ether 6/24/99 50.0 58.8 ug/l 70.0-130 118 <br /> Surrogate: 1,2-DCA-d4 1150.0 49.4 60.0-140 98.8 <br /> LrdkR 9060372-BSD 1 <br /> Methyl tert-butyl ether 6/24/99 50.0 57.4 ug/I 70.0-130 115 25.0 2.58 <br /> Surrogate: 1,2-DCA-d4 50.0 50.0 60.0-140 100 <br /> Matri�Soike 9M372-MSI 5906385-01 <br /> Methyl tert-butyl ether 6/24/99 50.0 2.18 61.4 ug/I 60.0-140 118 <br /> Surrogate: 1.2-DCA-d4 50.0 51.4 60.0-140 103 <br /> Seq oia Analytical -Sacramento *Refer to end of report for text ofnoles and definitions. <br /> Page 19 of 21 <br />