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885 Jarvis Dr <br /> Sequoia Morgan Hill,CA 95037 <br /> ' Analytical FAX(408)776 9600 <br /> (408)762-6308 <br /> Aawww sequoialabs can <br /> ecor-Rancho Cordova Project ARCO#4932,Stockton,CA MLK0860 <br /> 3017 Kilgore Rd Suite 100 Project Number ARCO#4932,Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 12/23/02 10 48 <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 2L12026-EPA 5035 <br /> Blank(2L12026-BLKI) Prepared&Analyzed 12/04/02 <br /> Ethanol ND 40 ug/l 0-10 <br /> tert-Butyl alcohol ND 20 " <br /> Methyl tert-butyl ether ND 050 " <br /> Dr isopropyl ether ND 050 " <br /> Ethyl tent butyl ether ND 050 " <br /> tett-Amyl methyl ether ND 050 0-09 <br /> 1,2-Dichloroethane ND 050 " <br /> 1,2 Drbromoethane(EDB) ND 050 " <br /> Surrogate 1 2-Dichloroethane-d4 374 500 748 78-129 0-10 S-LIM <br /> Laboratory Control Sample(2L12026-BS1) Prepared&_Analyzed 12/04/02 <br /> 4thyl tent butyl ether 113 050 ug/l 100 113 63-137 <br /> Surrogate 12-Dichloroethane-d4 399 Soo 798 78-129 0-10 <br /> Laboratory Control Sample Dup(2L12026-BSD1) Prepared&Analyzed 12/0.4/02 <br /> Methyl tert-butyl ether 121 050 ug/l 100 121 63-137 684 13 <br /> Surrogate 1 2-Dichloroethane-d4 383 500 766 78-129 0-10 S-LIM <br /> Batch 2L12027-EPA 5035 <br /> Blank(2L12027-11LKI) Prepared&Analyzed 12/04/02 <br /> Ethanol ND 40 ug/l <br /> tert-Butyl alcohol ND 20 " <br /> Methyl cert-butyl ether ND 050 " <br /> Dr-isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 050 " <br /> tert-Amyl methyl ether ND 050 0-09 <br /> 1,2-Dichloroethane ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> Surrogate 1 2-Dichloroethane-d4 441 500 882 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 /> Page 21 of 23 <br />