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819 Striker Avenue'Sulte 8 " <br /> Sequoia Sacramento, 9Z 95834 <br /> (916)9x1-9600 <br /> FAX(916)921-0100 <br /> Analytical www sequoialabs com <br /> IT Corporation-Sacramento Project Tosco 4409, Stockton,CA <br /> 1326 N Market Blvd Project Number NIA Reported <br /> Sacramento CA,95834 Project Manager Kathleen Waldo 09/19/01 16 52 <br /> Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical- San Carlos <br /> Reporting Spike Source %REC RPD <br /> lAnalytc Result Limit Units Level Result %REC Limits RPD Lima Notes <br /> Batch 1090053-EPA 5030B [P/'1'] <br /> Blank(1090053-BLKI) Prepared&Analyzed 09/14/01 <br /> Ethanol ND 50 mg/kg <br /> 1,2-Dibromoethane ND 010 " <br /> 1,2-Dichloroethane ND 0 10 " <br /> Di-isopropyl ether ND 0 10 " <br /> Ethyl tent-butyl ether ND 0 10 " <br /> Methyl tert-butyl ether ND 0 10 " <br /> Teri amyl methyl ether ND 0 10 " <br /> Tert-butyl alcohol ND 5 0 " <br /> Surrogate 1,2-Dichloroethane-d4 246 250 984 70-121 <br /> Surrogate Toluene-d8 246 2 50 984 81-117 <br /> LCS(1090053-BS1) Prepared&Analyzed 09/14/01 <br /> Methyl tert-butyl ether 234 0 10 mg/kg 2 50 93 6 70-130 <br /> Surrogate 1,2-Dichloroethane-d4 235 250 94 0 70-121 <br /> Surrogate Toluene-d8 237 2 50 948 81-117 <br /> _Matrix Spike(1090053-MS1) Source L109066-01 Prepared&Analyzed 09/14/01 <br /> Methyl text-butyl ether 233 0 10 mg/kg 250 ND 93 2 60-140 <br /> Surrogate 1,2-Drchloroethane-d4 225 " 250 900 70-121 <br /> Surrogate Toluene-d8 136 If250 944 81-117 <br /> Matrix Spike Dup(1090053-MSD1) Source L109066-01 Prepared&Analyzed 09/14/01 <br /> Methyl tert-butyl ether 226 0 10 mglkg 2 50 ND 904 60-140 305 25 <br /> Surrogate 12-Dichloroethane-d4 208 250 832 70--121 <br /> Surrogate Toluene-& 215 250 860 81-117 <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 0 <br /> Page 15 of 16 <br />