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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,)9 99834 <br /> lz� (91fi)921-9fi0D <br /> ,o Analytical www <br /> seq 6)92 s 100 <br /> corn <br /> www sequoialabs corn <br /> E <br /> SECOR International-Rancho Cordova Project ARCO 595,Stockton,CA <br /> 3017 Kilgore Road,Suite 100 project Number 595,Stockton,CA Reported <br /> Rancho Cordova CA,95670 Prosect Manager Rusty Benkosky 07/30/02 14 12 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Lutut Units Level Result %REC Linruts RPD Lunit Notes <br /> Batch 2070232-EPA 5030B [P/TJ <br /> L.CS(2070232-BS1) Prepared&Analyzed 07/24/02 <br /> Methyl tert-butyl ether 208 050 ugl] 21 8 95 60-140 <br /> Surrogate 12-DCA-d4 244 250 98 60-140 <br /> Matrix Spike(2070232-MS1) Source S_207267-01 Prepared&Analyzed 07/24/02 <br /> Methyl tert-butyl ether 204 050 ug/1 21 8 ND 94 60-140 <br /> Surrogate 1 2-DCA-d4 220 " 250 88 60-140 <br /> Matrix Spike Dup(2070232-MSD1) Source 5207267-01 Prepared&Analyzed 07/24/02 <br /> Methyl tert-butyl ether 226 050 USA 21 8 ND 104 60-140 10 25 <br /> Surrogate I 1-DCA-d4 241 250 96 60-140 <br /> Sequoia 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 15 of 16 <br />