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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento )9 95834 <br /> ,2� (9/6)921-9600 i <br /> Analytical FAX(916) 00 <br /> www sequoialabs labs com i <br /> SECOR International-Rancho Cordova Project ARCO 4493,Stockton,CA <br /> 3017 Kilgore Road,Suite 100 Project Number 4493,Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 06/17/02 11 52 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2060151-EPA 5030B [P/TJ <br /> Blank(2060151-BLK1) Prepared 06/13/02 Analyzed 06/14/02 <br /> Tert-butyl alcohol ND 50 ug/l <br /> Methyl tert-butyl ether ND 050 " <br /> Di isopropyl ether ND 050 " <br /> Ethyl tent-butyl ether ND 050 " <br /> Tert-amyl methyl ether ND 050 " <br /> Ethanol ND 50 " <br /> 1,2-Dichloroethane ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> Surrogate 12-DCA-d4 290 250 116 60-140 <br /> LCS(2060151-BS1) Prepared 06/13/02 Analyzed 06/14/02 <br /> Methyl tert-butyl ether 520 050 ug/l 545 95 60-140 <br /> 4Krrogate 12-DCA-d4 289 " 250 116 60-140 <br /> atrix Spike(2060151-MSI) Source 5206079-15 Prepared 06/13/02 Analyzed 06/14/02 <br /> Methyl tert-butyl ether 550 050 ugA 545 ND 101 60-140 <br /> Surrogate 12-DCA-d4 294 " 250 118 60-140 <br /> Matrix Spike Dup(2060751-MSDI) Source 5206079-15 Prepared 06/13/02 Analyzed 06/14/02 <br /> Methyl cert-butyl ether 526 050 ug/l 545 ND 97 60-140 4 25 <br /> Surrogate I 1-DCA-d4 279 11250 112 60-140 <br /> equoia Analytical- Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page Page 8 of 9 <br />