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819 Striker Avenue Suite 8 <br /> Saento CA 95834 <br /> Sequoia (916)921-9600 <br /> FAX(916)921-0100 <br /> Analytical v sequoialabs com <br /> to <br /> SECOR International-Rancho Cordova Project ARCO 595, Stockton,CA <br /> 3017 Kilgore Road,Suite 100 Project Number N/A Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Senkosky 08/06/01 17 56 <br /> Volatile Oxygenate Compounds by EPA Method 8260A - 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 1080001 -EPA 5030B [P/T] <br /> Blank(1080001-BLKI) Prepared& Analyzed 08/0][101 <br /> Tert-butyl alcohol ND 200 ag/l <br /> Methyl tert-butyl ether ND 20 <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 20 " <br /> Tert-amyl methyl ether ND 20 " <br /> Ethanol ND 3000 " <br /> 1,2-Dichloroethane ND 20 " <br /> Ethylene dibromide ND 20 " <br /> Surrogate 1 2-,DCA-d4 53 1 500 106 60-140 <br /> LCS(1080001-BSI) _ Prepared&Analyzed 08/01/01 __ T <br /> cert-butyl ether 53 0 20 ug/l 500 106 60-140 <br /> S gate 1 2-DCA-d4 564 1500 113 60-140 <br /> Matrix Spike(1080001-MSI)T Source 5107281-01 Prepared&Analyzed 08/01/01 <br /> Methyl tert-butyl ether 523 20 ug/1 500 ND 105 60-140 <br /> Surrogate 1 2-DCA-d4 567 500 113 60-140 <br /> _Matrix Spike Dup(1080001-MSD1) __ Source 5107281-01 Prepared&Analyzed 08/01/01 <br /> Methyl tert-butyl ether 537 20 ug(l 500 ND 107 60-140 264 25 <br /> Surrogate 12-DCA-d4 576 500 115 60-140 <br /> I <br /> to 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 5 of 6 <br />