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819 Striker Avenue "Sulte 8 r <br /> Sequoia Sacramento,CA 95834 <br /> (916)921-9600 <br /> %0- Analytical www <br /> 921-0100 <br /> ww sequoeciuoialabs corn <br /> IT Corporation-Sacramento Project Tosco 4409, Stockton,CA <br /> 1326 N Market Blvd Project Number N/A Reported <br /> Sacramento CA,95834 Project Manager Kathleen Waldo 09/21/01 15 18 <br /> 7 <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 °/9REC Limits RPD Limit Notes <br /> Batch 1090138-EPA 5030B [MeOH] <br /> Blank(1090138-BLK1) Prepared 09/14/01 Analyzed 09/15/01 <br /> Tert-butyl alcohol ND 10 mg/kg <br /> Methyl tert-butyl ether ND 010 " <br /> Di-isopropyl ether ND 010 " <br /> Ethyl tert-butyl ether ND 010 " <br /> Tert-amyl methyl ether ND 010 " <br /> Ethanol ND 150 " <br /> 1,2-Dichloroethane ND 010 " <br /> Ethylene dibromide ND 010 " <br /> Surrogate 1 2-DCA-d4 258 250 103 60-140 <br /> LCS(1090138-BSI) Prepared 09/14/01 Analyzed 09/15/01 <br /> Methyl.tert-butyl ether 257 010 mg/kg 250 103 60-140 <br /> Surrogate 12-DCA-d4 276 11250 110 60-140 <br /> Matrix Spike(109013_8-MSI) Source S109122-01 Prepared 09/14/01 Analyzed 09/15/01 <br /> Methyl tert-butyl ether 234 010 mg/kg 250 ND 936 60-140 <br /> Surrogate 12-DCA-d4 232 250 928 60-140 <br /> Matrix Spike Dup(1090138-MSDI) Source $109122-01 Prepared 09/14/01 Analyzed 09/15/01 <br /> Methyl tert-butyl ether 246 010 mg/kg 250 ND 984 60-140 500 25 <br /> Surrogate 1,2-DCA-d4 245 250 980 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 to its entirety <br /> Page 5 of 9 <br />