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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,)9 95834 <br /> (916)921-9600 <br /> Analytical FAX 92 1 00 <br /> www sequoialabs cam <br /> SECOR International-Rancho Cordova Project Arco 6020,Manteca,CA <br /> 3017 Kilgore Road,Suite 100 Pmject Number 6020,Manteca,CA Reported <br /> Rancho Cordova CA,95670 Project ma-ger Rusty Benkosky 04/03/02 18 59 <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 2030328-EPA 5030E [P/TJ <br /> Blank(2030328-BLK1) Prepared&Analyzed 03/26/02 <br /> Tert-butyl alcohol ND 5 0 ug/I <br /> Methyl tert-butyl ether ND 050 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Tert-amyl methyl ether ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethylene dibromide ND 0 50 " <br /> Surrogate 1,2-DCA-d4 31 0 250 124 60-140 <br /> LCS(2030328-BS1) Prepared&Analyzed 03/26/02 <br /> Methyl tert-butyl ether 31 8 050 u8A 250 127 60-140 <br /> Surrogate 12-DCA-d4 288 250 115 60-140 <br /> �1Vlatriat S ike 2030328-MS1) Source 5203379-01 Pre ared&Anal zed 03/26/02 <br /> Methyl tert-butyl ether 305 0 50 ug/1 250 ND 122 60-140 <br /> Surrogate 12-DCA-d4 286 250 114 60-140 <br /> Matrix Spike Du (2030328-MSD1) Source 5203379-01 Prepared&Analyzed 03/26/02 <br /> Methyl tert-butyl ether 329 050 ug/l 250 ND 132 60-140 7 57 25 <br /> Surrogate 1 2-DCA-d4 298 250 119 60-140 <br /> Batch 2030350-EPA 5030B[P/T] <br /> Blank 2030350-BLK1 Prepared&Analyzed 03/27/02 <br /> Tert-butyl alcohol ND 50 ug/1 <br /> Methyl tert-butyl ether ND 0 50 " <br /> Di-isopropyl ether ND 0 50 " <br /> Ethyl tent-butyl ether ND 0 50 " <br /> Tert-amyl methyl ether ND 0 50 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethylene dibromide ND 050 " <br /> Surrogate 12-DCA-d4 33 1 250 132 60-140 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document This analytical report must be reproduced in its entirety <br /> Page Page 9 of 11 <br />