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4� <br /> Sequoia 819 Sin958ker Avenue 4 <br /> Sacramento CA 95834 <br /> 4 (916)921-9600 <br /> FAX(916)921-0100 <br /> Analytical www sequolalabs com <br /> SECOR International-Rancho Cordova Project ARCO 595, Stockton,CA Sampled 6/16/00 <br /> 3017 Kilgore Road,Suite 100 Project Number N/A Received 6/16/00 <br /> Rancho Cordova,CA 95670 Project Manager RusEy Benkosky Reported 6/30/00 <br /> Volatile Oxygenate Compounds by EPA Method 8260A/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> lAnalyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> Blank(continued) 0060286-BLK1 <br /> Methyl tert-butyl ether 6/29100 ISD ug/1 200 <br /> Di-isopropyl ether ND 200 <br /> Ethyl tert-butyl ether ND 200 <br /> Tert-amyl methyl ether ND 200 <br /> Ethanol ND 3000 <br /> 1,2-Dlchloroethane ND 200 <br /> Ethylene dlbromide ND 200 <br /> Surrogate 1,2-DCA-d4 500 514 600-140 103 <br /> LCS 0060286-BS1 <br /> Methyl tert-butyl ether 6/29/00 50 0 500 ug/1 70 0-130 100 <br /> Surrogate 1,2-DCA-d4 11500 528 If <br /> 600-140 106 <br /> Ulapul) 0060286-BSD 1 <br /> !tert-butyl ether 6129/00 500 496 ug/l 700-130 992 250 0 803 <br /> Surrogate 1,2-DCA-d4 11500 528 600-140 106 <br /> Matrix Spike 0060286-MS1 5006320-05 <br /> Methyl tert-butyl ether 6/29100 500 ND 520 ug/1 600-140 104 <br /> Surrogate 1,2-DCA-d4 It500 538 IF 600-140 108 <br /> Matrix Spike Dun 0060286-MSD1 5006320-05 <br /> Methyl tert-butyl ether 6/29100 500 ND 536 ug/l 600-140 107 25 0 284 <br /> Surrogate 7,2-DCA-d4 500 564 600-140 113 <br /> -0 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions <br /> Page 8 of 9 <br />