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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> Analytical865 <br /> (70oialab com <br /> FAX(707)792-0342 <br /> www sequoiala6s com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P406495 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50293 Reported <br /> Sa=MentO CA,95833 Project Manager Vernon P Elanh 07/29/04 17 56 <br /> Volatile Organic Compounds by EPA Method 8260B -Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %uREC RPD <br /> Analyte Result Limit Units Level Result %uREC Limits RPD Ltmn Notes <br /> Batch 4GO7040-EPA 5030E PIT <br /> Laboratory Control Sample(4G07040-BSI) Prepared&Analyzed 07/07/04 <br /> tert-Amyl methyl ether 103 050 ug/I 100 103 82-140 <br /> tert-Butyl alcohol 600 20 500 120 56-131 <br /> Di-isopropyl ether 103 050 100 103 76-130 <br /> 1,2-Dichloroethane 100 050 " 100 100 77-136 <br /> Ethanol 217 100 200 108 31-143 CC04 <br /> Ethyl tert-butyl ether 104 050 100 104 81-121 <br /> Methyl tert-butyl ether 109 050 100 109 63-137 <br /> Surrogate 12 Dichloroethane-d4 219 250 88 78-129 <br /> Laboratory Control Sample(4G07040-BS2) Prepared&Analyzed 07/07/04 <br /> Methyl tert-butyl ether 806 050 ug/I 992 81 63-137 <br /> Surrogate 12-Dichloroethane-d4 213 250 85 78-129 <br /> 0 aboratory Control Sample Dup(4G07040-BSD1) Prepared 07/07/04 Analyzed 07/08/04 <br /> tert-Amyl methyl ether 104 050 ugll too 104 82-140 1 20 <br /> tert-Butyl alcohol 689 20 500 138 56-131 14 20 QC01 <br /> Di-isopropyl ether 102 050 100 102 76-130 1 20 <br /> 1 2-Dichloroethane 102 050 loo 102 77-136 2 20 <br /> Ethanol 175 100 200 88 31-143 21 20 CC04,QC21 <br /> Ethyl tent-butyi ether 104 050 too 104 81-121 0 20 <br /> Methyl tert-butyl ether 106 050 100 106 63-137 3 20 <br /> Surrogate 1 2-Dichloroethane-d4 221 250 88 78-129 <br /> Matrix Spike(4G07040-MSI) Source MNF0733-06 Prepared 07/07/04 Analyzed 07/08/04 <br /> Methyl tert-butyl ether 1070 50 ug/I 992 300 78 63 137 <br /> Surrogate 1 2-Dichloroethane-d4 209 250 84 78-129 <br /> Matrix Spike Dup(4G07040-MSD1) Source MNF0733-06 Prepared 07/07/04 Analyzed 07/08/04 <br /> Methyl cert-butyl ether 1050 50 ug/l 992 300 76 63-137 2 20 <br /> Surrogate 12 Dichloroethane-d4 123 11250 89 78-129 <br /> Sequoia Analytical-Petaluma 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 37 of 41 <br />