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^ ri <br /> 885 Jarvis Dnve <br /> Sequoia Morgan Hill CA 95037 <br /> Analytical (4D8)77b 630 <br /> FAX(408)782 63088 <br /> www sequoialabs can <br /> Secor-Rancho Cordova Project ARCO#595,Stockton,CA <br /> 3017 Kilgore Rd Suite 100 Project Number ARCO#595,Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 10/29/02 08 25 <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 2J17016-EPA 5030B P/T <br /> Blank(2J17016-BLK1) Pre ared&Analyzed 10/16/02 <br /> Ethanol ND 40 ug/l <br /> tert-Butyl alcohol ND 20 " <br /> Methyl tert-butyl ether ND 0 50 " <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 0 50 " <br /> Ethylene dibromide ND 0 50 " <br /> Surrogate 1 2-Dechloroethane-d4 532 500 106 78-119 <br /> LCS(2J17016-BSI) _ Prepared 10/16/02 Analyzed 10/17/02 <br /> Methyl tert-butyl ether 21 2 050 ugll 20 0 106 63-137 <br /> urrogate 1 2-Dechloroethane-d4 422 500 844 78-119 <br /> CS Dup(2J17016-BSD1) Prepared 10/16/02 Analyzed 10/17/02 <br /> Methyl tert-butyl ether 21 1 050 up/l 20 0 106 63-137 0 473 13 <br /> Surrogate 1 2-Dechloroethane-d4 4 08 500 81 6 78-129 <br /> Batch 2J21016-EPA 5035 <br /> Blank(2JZ1016-BLK1) Prepared&Analyzed 10_/17102 <br /> Ethanol ND 40 ug/I <br /> tert-Butyl alcohol ND 20 " 0-09 <br /> Methyl tert-butyl ether ND 0 50 " <br /> Di-isopropyl ether ND 0 50 " <br /> Ethyl tert-butyl ether ND 050 " <br /> tert-Amyl methyl ether ND 0 50 " <br /> 1,2-Dechloroethane ND 0 50 " <br /> Ethylene dibromide ND 0 50 " <br /> Surrogate 1 2-Dichloroethane-d4 4 71 Soo 942 78-119 <br /> equoea Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain <br /> of custodv document This analytical report must be reproduced en its entirety <br /> 15 of 17 <br />