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Sequoia 1455 McDowellPetaluma,CA 949544 <br /> 865 <br /> a— —) <br /> FAX(107)792-0342 Analytical ( 107)792-0342342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P406072 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50265 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 06/17/04 17 27 <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 4F14005-EPA 5030B PFT <br /> Blank(4F14005-BLKI) Prepared&Analyzed 06/14/04 <br /> Ethanol ND 100 ug/I <br /> tert-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 1 2-Dichloroethane-d4 580 500 116 78-129 <br /> Laboratory Control Sample(4F14005-BSI) Prepared&Analyzed 06/14/04 <br /> Ethanol 181 100 ug/1 200 905 31-143 <br /> ,ethyl <br /> alcohol 504 20 " 500 101 56-131 <br /> ethyl tent-butyl ether 976 050 100 976 63-137 <br /> Di-isopropyl ether 873 050 100 973 76-130 <br /> Ethyl cert-butyl ether 916 050 100 916 81-I21 <br /> tert-Amyl methyl ether 950 050 100 950 82-140 <br /> 1 2-Dichloroethane 106 050 100 106 77-136 <br /> 1,2-Dibromoethane(EDS) 102 050 100 102 77-132 <br /> Surrogate 12-Dichloroethane-d4 619 500 124 78-129 <br /> Laboratory Control Sample Dup(4F14005-BSDI) Prepared&Analyzed 06/14/04 <br /> Ethanol 174 100 ug/l 200 870 31-143 394 20 <br /> tert-Butyl alcohol 542 20 500 108 56-131 727 20 <br /> Methyl tert-butyl ether 100 050 100 100 63-137 243 20 <br /> Di-isopropyl ether 927 050 100 927 76-130 600 20 <br /> Ethyl tert-butyl ether 958 050 100 958 81-121 448 20 <br /> tert-Amyl methyl ether 957 050 100 957 82-140 0 734 20 <br /> 1,2-Dichloroethane 115 050 100 115 77-136 814 20 <br /> 1,2-Dibromoethane(EDB) 109 050 100 109 77-132 664 20 <br /> Surrogate 1 2-1)ichloroethane-d4 606 Soo 121 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 8 of 11 <br />