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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94454 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> i <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P406495 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number lntrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/29/04 17 56 <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 0/.REC Limits RPD Limit Notes <br /> Batch 4GO7003-EPA 5030B PIT <br /> Blank(4G07003-BLK1) Prepared&Analyzed 07/07/04 <br /> tert-Amyl methyl ether ND 050 ug/I <br /> tert-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Methyl tert-butyl ether ND 050 " <br /> Surrogate 12-Dichloroethane-d4 517 500 103 78-129 <br /> Laboratory Control Sample(4G07003-BS1) Prepared&Analyzed 07/07/04 <br /> tert-Amyl methyl ether 105 050 ugll 100 105 82-140 <br /> tert-Butyl alcohol 536 20 500 107 56-131 <br /> isopropyl ether 102 050 100 102 76-130 <br /> Dichloroethane 110 050 100 110 77-136 <br /> Ethanol 208 100 200 104 31-143 <br /> Ethyl tert-butyl ether 105 050 100 105, 81-121 <br /> Methyl tert butyl ether 107 050 100 107 63-137 <br /> Surrogate 1 2-Dichloroethane-d4 499 500 100 78-129 <br /> Matrix Spike(4G07003-MSI) Source P406495-01 Prepared&Analyzed 07/07/04 <br /> tert-Amyl methyl ether 118 050 ugfi 100 ND 118 82-140 <br /> tert-Butyl alcohol 575 20 500 ND 115 56-131 <br /> Di-isopropyl ether 101 050 100 ND 101 76-130 <br /> 1,2-Dichloroethane 131 050 100 ND 131 77-136 <br /> Ethanol 152 100 200 ND 76 31-143 <br /> Ethyl tert-butyl ether 113 050 100 ND 113 81-121 <br /> Methyl tert butyl ether 118 050 100 ND 118 63-137 <br /> Surrogate 1 2-Drchloroelhane-d4 580 500 116 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 34 of 41 <br />