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819 Striker Avenue,Suite 8 <br /> Saaamenro,CA 95834 <br /> Sequoia (916)921-9600 <br /> FAX(916)921.0100 <br /> Analytical www-sequaal&ts.com <br /> SECOR International-Rancho Cordova Project: ARCO 4493, Stockton,CA Sampled. 9119100 <br /> 3017 Kilgore Road,Suite 100 Project Number: N/A Received. 10/11/00 <br /> Rancho Cordova,CA 95670 Project[ er: Rusty Benkosky Re vrted_ 10/13/00 <br /> Volatile 0genate Co�n�1.oz M&by OA Method$zbQA/Qualitp Coxitrol <br /> Sequoia Analytical-Sacramehko <br /> Date Spike Sample QC Reporting Limit Rccov. RPD RPD <br /> Analyte Anal zed Level Result Result Units Recov,Limits % Limit % Nous* <br /> Batch: 0100097 DatePreaared: 10!310¢ Extraction Method: EPA 5030E Tffl <br /> Blank 0100097-BLK1 <br /> Tert-butyl alcohol 1013100 ND U911 200 <br /> Methyl tort butyl ether ND " 2.00 <br /> Di-isopropyl ether ND 2.00 <br /> Ethyl test butyl ether ND 2.00 <br /> Teri-mmyl methyl ether IND " 2.00 <br /> Ethanol " ND 3000 <br /> 1,2-Dichloroed=e ND " 2.00 <br /> Ethylene dibromide " ND 2.00 <br /> Surrogate: 1,2-DC444 50.0 50.2 60.0-140 100 <br /> 1.CS 0100097-31371 <br /> vl tett-butyl ether _ 1013100 50.0 49.0 ug/l 60.0-140 98.0 <br /> Waw 1,2-DCA-d4 µ 50.0 5.x.0 60.0-140 106 <br /> Matrix Spike 0100097-MSI 5010224-01 <br /> Methyl tern-butyl ether 10/3/00 50.0 ND 49.8 u9/1 60.0-140 9_9.6 <br /> Swrogate: 1,2-DCA-d4 50.0 - 50.8 60.0-140 102 <br /> MtrjixiStzke Buy 0100097 MSDI 5010224-01 <br /> Mcthyl tort butyl et>zer 10/3/00 50.0 ND 49.8 uW 60.0-140 99.6 25.0 0 r <br /> Surmgare: 1.1-DCA-d4 'J.M� 50.0 53.8 60.0-140 108 <br /> • <br /> Sequoia Analytical-Sacramento *Refer to and of report for test of motes and def:nlrfona. <br /> Page 4of5 <br /> 6i9 d <br /> 3US/UIOF103S WUES:01 00, CT IDO <br />