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Sequoia $19 Straker Avenue Sulte958 8 <br /> Sacramento [A 95834 <br /> (916)921-9600 <br /> Analytical FAX(916) 00 <br /> www sequoialabs alahs com <br /> • <br /> SECOR International-Rancho Cordova Project Chevron 9-2396,Acampo,CA <br /> 3017 Kilgore Road,Suite 100 Project Number 077 43485 150 Reported <br /> Rancho Cordova CA,95670 Project Manager Roger Hoffmore 05/16/01 15 45 <br /> Volatile Oxygenate Compounds by EPA Method 8260A - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RFD <br /> Analyte Result Limit Units Level Result %REG Limits RPD Limit Notes <br /> Batch 1050061 - EPA 5030B IMeOHI <br /> LCS(1050061-BSI) Prepared&Analyzed 05/04/01 _ <br /> Methyl tert-butyl ether 251 0 100 mg/kg 250 100 60-140 <br /> Surrogate 1 2-DCA-d4 159 11250 104 60-140 <br /> Matrix Spike(1050061-MSI) Source 5104412-15 Prepared&Analyzed 05/04/01 _ <br /> Methyl cert-butyl ether 252 0 100 mg/kg 250 ND 986 60-140 <br /> Surrogate I 1-DCA-d4 252 250 101 60-140 <br /> Matrix Spike Dup(1050061-MSDI) Source 5104412-15 Prepared&Analyzed 05/04/01 <br /> Methyl tent-butyl ether 240 0 100 mg/kg 250 ND 93 8 60-140 488 25 <br /> Surrogate 1 2-DCA-d4 244 150 976 60-140 <br /> 1050076-EPA 5030BJP/T] <br /> hW(1050076-BLK1) Prepared&Analyzed 05/07/01 <br /> Tert-butyl alcohol ND 200 ug/l <br /> Methyl tert-butyl ether ND 200 " <br /> Di-isopropyl ether ND 200 " <br /> Ethyl tert-butyl ether ND 200 " <br /> Tert-amyl methyl ether ND 200 " <br /> Ethanol ND 3000 " <br /> 1,2-Dichloroethane ND 200 " <br /> Ethylene dibromide ND 200 " <br /> Surrogate 1,2-DCA-d4 512 500 102 60-140 <br /> LCS(1050076-BS1) Prepared&Analyzed 05/07/01 <br /> Methyl tert-butyl ether 544 200 ug/l 500 109 60-140 <br /> Surrogate 12-DCA-d4 516 500 103 60-140 <br /> oia 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 <br /> Page 13 of 16 <br />