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819 Striker Avenue Suite 8 <br /> Sequoia 5acrarnento,CA 95834 <br /> ID (916)921-9600 <br /> � Analytical FAX equo alabs92 1 r 00 <br /> www sequoialabs com <br /> IT Corporation-Sacramento Project Tosco 4409,Stockton,CA <br /> 1326N Market Blvd Project Number N/A Reported <br /> Sacramento CA, 95834 Project Manager Kathleen Waldo 09/19/01 16 52 <br /> Volatile Oxygenate Compounds by EPA Method 8260A- Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result lamut Units Level Result %RBC Limits RPD Limit Notes <br /> Batch 1090104-EPA 5030B [MeOH] <br /> Blank{1090144-13LK1) Prepared 09/11/01_Analyzed 09/12/01 <br /> Tert-butyl alcohol ND 10 mg/kg <br /> Methyl cert-butyl ether ND 010 " <br /> Di-Isopropyl ether ND 010 " <br /> Ethyl tert-butyl ether ND 0 10 " <br /> Tert-amyl methyl ether ND 010 " <br /> Ethanol ND 150 " <br /> 1,2-Dichloroethane ND 010 " <br /> Ethylene dibromrde ND 010 " <br /> Surrogate 1,2-DCA-d4 233 250 932 60-140 <br /> LCS(1090104-BSI) Prepared 09/11/01 Analyzed 09/12/01 <br /> Methyl tert-butyl ether 225 010 mg/kg 250 900 60-140 <br /> Surrogate 1,2-DCA-d4 236 250 944 60-140 <br /> Matrix Spike(1090104-MS1) Source S109089-01 Prepared 09/11/01 Analyzed 09/12/01 <br /> Methyl tort-butyl ether 2 16 010 mg/kg 250 ND 864 60-140 <br /> Surrogate 1,2-DCA-d4 221 " 250 884 60-140 <br /> Matrix Spike Dup(1090104-MSD1) Source 5109089-01 Prepared 09/11/01 Analyzed 09/12/01 _ <br /> Methyl tert-butyl ether 211 010 mg/kg 250 ND 844 60-140 234 25 <br /> Surrogate 1,2-DCA-d4 213 250 852 60-140 <br /> Sequoia Analytical- Sacramento The results In this report apply to the samples analyred in accordance with the chain 0 <br /> 0 <br /> custody document This analytical report must be reproduced to its entirety <br /> Page 13 of 16 <br />