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819 Striker Avenue Suite 8 <br /> Sequoia swam `7 996W <br /> (9!91 6)921-9600 <br /> FAX(916)921 0100 <br /> Analytical www sequotalabs com <br /> Gettler-Rvan-Rancho Cordova Project Unocal 0123 Tracv CA <br /> 3164 Gold Camp Dr Ste 240 Project Number NIA R"reed <br /> Rancho Cordova CA 95670 Project Manager David Herzog 12/04/00 13 58 <br /> Volatile Oxygenate Compounds by EPA Method 8260A - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result ISREC Limits RPD Llmlt Notes <br /> Batch 0110268- EPA 50308 JMe0HJ <br /> Blank(01 10268-BLKI) Prepared&Analyzed 11/21/00 <br /> Tert-butyl alcohol ND 100 mg/kg <br /> Methyl tcrt-butyl ether ND 0 100 <br /> Di-isopropyl ether ND 0 100 <br /> Ethyl tert-butvl ether ND 0 100 <br /> Tert-amyl methyl ether ND 0 100 <br /> Ethanol ND 150 <br /> 12-Dichloroethane ND 0100 <br /> Ethylene dibromide ND 0 100 <br /> Surrogate 12-DCA-d4 218 230 872 60-140 <br /> CS(0 1 10268-BS 1) _ - Prepared&Analyzed 11/21/00 <br /> Methyl tert-butyl ether 238 0 100 mg/kg 250 952 70-130 <br /> Surrogate 1 2 DCA d4 229 250 916 60-140 <br /> Matrix Spike(0110268-MSI) Source S011243-03 _T Prepared&Analyzed 11/21/00 <br /> Methyl tert-butyl ether 241 0 100 mg/kg 250 ND 964 60-140 <br /> Surrogate 12 DCA d4 224 250 896 60-140 <br /> Matrix Spike Dup(01 10268-MSD 1) Source SOI 1243-03_ _ Prepared&Analyzed 11/21/00 _ <br /> Methvl ten butyl ether 241 0 100 mg/kg 250 ND 964 60-140 0 25 <br /> .Surrogate 1 2 DCA d4 233 230 932 60-140 <br /> 46 <br /> Sequoia Anaiytical- 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 13 of 15 <br />