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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs coni <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P309112 <br /> 3017 Kilgare Road Suite 100 Project Number 30732 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 09//6/03 18 59 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Anslyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3090336-EPA 5030 waters <br /> Blank(3090336-BLK1) Prepared&Analyzed 09/16/03 <br /> Tert-amyl methyl ether ND 1 0 ugA <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di isopropyl ether ND 1 0 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 <br /> Ethylbenzene ND 0 50 " <br /> Ethyl tert butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 0 50 <br /> Xylenes(total) ND 0 50 " <br /> arrogate Dibromofluorom ethane 6 03 6 00 100 84-122 <br /> Surrogate 1,1-Dichloroethane-d4 524 6 00 87 74-135 <br /> Surrogate Toluene-d8 616 6 00 103 84-119 <br /> Surrogate 4-Bromofluorobenzene 5 82 6 00 97 86-119 <br /> Laboratory Control Sample(3090336-BSI) Pre aced&Analyzed 09/16/03 <br /> Tert-amyl methyl ether 4 62 1 0 ug/l 5 00 92 70-116 <br /> Benzene 5 05 0 50 5 00 101 81-118 <br /> Tert-butyl alcohol 116 20 100 116 62-142 <br /> Di-isopropyl ether 4 99 1 0 5 00 100 71-121 <br /> 1,2-Dibromoethane(EDB) 4 63 0 50 500 93 92-117 <br /> 1,2-Dichloroethane 4 97 0 50 5 00 99 79-126 <br /> Ethanol 249 100 100 249 65-135 Q-LIM <br /> Ethylbenzene 5 06 0 50 5 00 101 89-122 <br /> Ethyl tert-butyl ether 4 84 1 0 5 00 97 71-110 <br /> Methyl tert-butyl ether 4 93 0 50 5 00 99 77-123 <br /> Toluene 5 08 0 50 5 00 102 84-119 <br /> Xylenes(total) 148 0 50 150 99 86-132 <br /> Surrogate Dibromofluorom ethane 6 45 600 108 84-122 <br /> Surrogate 1 2-D)chloroethane-d4 5 64 600 94 74-135 <br /> Surrogate Toluene-d8 607 600 101 84-119 <br /> Surrogate 4-Bromofluorobenzene 5 97 600 100 86-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 9 of 11 <br />