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885 Jams Dr <br /> 4D Sequoia MQpn Hill,CA 95037 <br /> Analytical (408)782-6 08 <br /> FAX(408 <br /> www sequoialabs can <br /> . Stratus Environmental Inc Project ARCO#2130 MLL0779 <br /> 3330 Cameron Park Dr,Suite 550 Project Number ARCO#2130,Stockton,CA Reported <br /> Cameron Park CA,95682 Project Manager Jay Johnson 01/10/03 16 20 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limtt Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2120520-EPA 5030B IP/T) <br /> Blank(2120520-BLK1) Prepared&Analyzed 12/31/02 <br /> 1,2-Dibromoethane(EDB) ND 050 ug/l <br /> 1,2-Dichloroethane ND 050 " <br /> Tert-butyl alcohol ND 200 A-01 <br /> Methyl tert-butyl ether ND 050 " <br /> Dt-isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Tert-amyl methyl ether ND 050 " <br /> Ethanol ND 50 " <br /> Blank(2120520-BLK2) Prepared&Analyzed 01/02/03 <br /> 1,2-Dibromoethane(EDB) ND 050 118/1 <br /> 1,2-Dichloroethane ND 050 " <br /> Tert-butyl alcohol ND 200 A-01 <br /> Wethyl tert butyl ether ND 050 " <br /> Di-isopropyI ether ND 050 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Tert-amyl methyl ether ND 050 " <br /> Ethanol ND 50 " <br /> Laboratory Control Sample(2120520-BSI) Prepared.&Analyzed 12/31/02 <br /> Methyl tert-butyl ether 183 050 ugll 224 82 60-140 <br /> Surrogate 12-DCA-d4 206 " 250 82 60-140 <br /> Laboratory Control Sample(2120520-BS2) Prepared&Analyzed 01/02/03 <br /> Methyl tert-butyl ether 156 050 ug/l 224 70 60-I40 <br /> Surrogate 1,2-DCA-d4 268 250 107 60-140 <br /> Matrix Spike(2120520-MSI) Source 5212546-02 Prepared&Analyzed 01/02/03 <br /> Methyl tert-butyl ether 223 050 uFA 224 10 95 60-140 <br /> Surrogate 12-DCA-d4 301 250 120 60-140 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of <br /> . custody document Unless otherwise stated results are reported an a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> 14 of 17 <br />