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819 Striker Avenue Suite 8 <br /> Sequoia Sacramento C 95834 <br /> a— —N (916)921-96W 1-9600 <br /> FAX(916)921-0100 <br /> soAnalytical www sequoialabs com <br /> SECOR International-Rancho Cordova Project Former Chevron 9-8632, (racy,CA <br /> 3017 Kilgore Road,Suite 100 Project Number 077 43506 150 Reported <br /> Rancho Cordova CA,95670 Project Manager Bill Brasher 06/15/01 13 38 <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 1050344- PPA 503013 [PIT) _ <br /> Blank(1050344-BLK1) Prepared&Analyzed 05/30/01 <br /> Tert-butyl alcohol ND 200 ug/l <br /> Methyi 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 12-DCA-d4 492 500 984 60-140 <br /> LCS(1050344-BS1) Prepared&Analyzed 05/30/01 _ <br /> tert-butyl ether 481 20 ug/l 500 962 60-140 <br /> SS ate 1 2-DCA-d4 516 11500 103 60-140 <br /> Matrix Spike(1050344-MSI) Source 5105308-04 Prepared&Analyzed 05/30/01 <br /> Methyl tert-butyl ether 47 1 20 ug/1 500 ND 942 60-140 <br /> Surrogate 1 2-DCA-d4 503 500 101 60-140 <br /> Matrix Spike Dup(1050344-MSD1) Source 5105308-04 Prepared&Analyzed 05/30/01 <br /> Methyl tert-butyl ether 505 20 ug/1 500 ND 101 60-140 697 25 <br /> Surrogate 12-DCA-d4 519 500 104 60-140 <br /> Batch 1050357- EPA 5030B (P/TJ <br /> Blank(1050357-BLK1) Prepared&Analyzed 05/31/01 <br /> Tert-butyl alcohol ND 200 ug/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 12-DCA-d4 480 500 960 60-140 <br /> ata Analytical- Sacramento The results to this report apply to the samples analyzed in accordance wuh the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 8 of 15 <br />