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885 Jarvis Dr <br /> �iSequoia Mcrgan HAI,CA 95037 <br /> (408)776-9600 <br /> ''W Analytical FAX(408)782-63M <br /> www sequoialabs can <br /> Secor-Rancho Cordova Project ARCO#595, Stockton,CA MMA0549 <br /> 3017 Kilgore Rd Suite 100 Project Number ARCO#595, Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 02/25/03 10 42 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical -Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3A31008-EPA 5030B P/T <br /> Laboratory Control Sample(3A31008-BS1) Prepared&Analyzed 01/31/03 <br /> Methyl tert-butyl ether 110 050 ug/] ]0 0 110 63-137 <br /> Surrogate 12-Dichloroethane-d4 574 500 115 78-129 <br /> Laboratory Control Sample Du (3A31008-BSD1) Prepared&Analyzed 0I/31/03 <br /> Methyl tert-butyl ether 114 050 ug/I 100 114 63-137 357 13 <br /> Surrogate 12-Dichloroethane-d4 561 500 112 78-129 <br /> i <br /> Batch 3A31017-EPA 5030B P/T <br /> Blank(3A31017-BLK1) Prepared 01/30/03 Analyzed 01/31/03 <br /> 4thanol ND 40 ug/1 <br /> -Butyl alcohol ND 20 <br /> Methyl tert-butyl ether ND 050 " <br /> Di-isopropyl ether ND 050 <br /> Ethyl tert-butyl ether ND 050 " <br /> tert-Amyl methyl ether ND 050 <br /> 1,2-Dichloroethane ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> Surrogate 12-Dtchloroethane-d4 524 500 105 78-129 <br /> Laboratory Control Sample(3A31017-BS1) Prepared&Analyzed 01/30/03 <br /> Methyl tent-butyl ether 109 050 ug/1 100 109 63-137 <br /> Surrogate 1 2-Dtchloroethane-d4 535 500 107 78-129 <br /> Laboratory Control Sample Dup(3A31017-BSD1) Prepared&Analyzed 01/30/03 <br /> Methyl tert-butyl ether 117 050 ug/1 100 117 63-137 708 13 <br /> Surrogate 12-Dichloroethane-d4 545 500 109 78-129 <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 on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> i <br /> 21 of 22 <br />