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819 Striker Avenue Suite 8 <br /> Sequoia <br /> Sacramento <br /> 9 95834 <br /> FAX(916)921-0100 <br /> Analytical www sequoialabs corn <br /> to- <br /> SECOR International-Rancho Cordova Project Chevron 9-6171,Stockton,CA <br /> 3017 Kilgore Road, Suite 100 Project Number 077 43512 251 Reported <br /> Rancho Cordova CA,95670 Project Manager Bill Brasher 07/12/01 18 32 <br /> Volatile Oxygenate Compounds by EPA Method 8260A - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %P-EC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1070035- EPA 5030E (MeOHI <br /> Blank(1070035-BLKI) Prepared 07/05/01 Analyzed 07/06/01 v <br /> Tert-butyl alcohol ND 10 mg/kg <br /> Methyl ten-butyl ether ND 0 10 " <br /> Di-tsopropyl ether ND 0 10 " <br /> Ethyl tert-butyl ether ND 0 10 <br /> Tert-amyl methyl ether ND 0 10 " <br /> Ethanol ND 150 " <br /> Surrogate 1 2-DCA-d4 252 250 101 60-140 <br /> LCS(1070035-BSI) Prepared 07/05/01 Analyzed 07/06/01 <br /> Methyl tert-butyl ether 234 0 10 mg/kg 250 936 60-140 <br /> Surrogate 1 2-DCA-d4 261 11250 104 60-140 <br /> &Spike(1070035-MSI) Source 5106435-03 Prepared 07/05/01 Analyzed 07/06/01 <br /> Methyl tert-butyl ether 209 0 10 mg/l.g 250 ND 836 60-140 <br /> Surrogate 11-DCA-d4 240 11250 960 60-140 <br /> Matrix Spike D_up(1070035-MSDI) _ Source 5106435-03 Prepared 07/05/01 Analyzed 07/06/01 <br /> Methyl tert-butyl ether 2 10 0 10 mg/kg 250 ND 840 60-140 0 477 25 <br /> Surrogate 12-DCA-d4 239 2 50 956 60-140 <br /> oia Analytical- Sacramento The results in 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 13 <br />