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1455 McDowell Blvd,Nonh Ste D <br /> a_ _� Sequoia Petaluma,CA 94954 <br /> (707)792 1865 <br /> r Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> s <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P406495 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P EIarth 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 %REC Limits RPD Limit Notes <br /> Batch 4GO7003-EPA 5030E P/T <br /> Matrix Spike Dup(4G07003-MSD1) Source P406495-01 Prepared&Analyzed 07/07/04 <br /> tert-Amyl methyl ether 109 050 ug/l 100 ND 109 82-140 8 20 <br /> cert-Butyl alcohol 538 20 500 ND 108 56-131 7 20 <br /> Di-isopropyl ether 994 050 100 ND 99 76-130 2 20 <br /> 1 2-Dichloroethane 124 050 too ND 124 77-136 5 20 <br /> Ethanol 153 100 200 ND 76 31-143 07 20 <br /> Ethyl tert-butyl ether 106 050 100 ND 106 81-121 6 20 <br /> Methyl tert-butyl ether It 1 050 100 ND 111 63-137 6 20 <br /> Surrogate 1,2-Dichloroethane-d4 571 500 114 78-129 <br /> Batch 4GO7024-EPA 5030E PIT <br /> Blank(4G07024-BLK1) Prepared&Analyzed 07/07/04 <br /> 0-rt-Amyl methyl ether ND 050 ug/l <br /> Butyl alcohol ND 20 " <br /> 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 577 500 115 78-129 <br /> Laboratory Control Sample(4G07024-BSI) Prepared&Analyzed 07/07/04 <br /> tert Amyl methyl ether 838 050 ugll too 84 82-140 <br /> tert-Butyl alcohol 520 20 500 104 56-131 <br /> Di isopropyl ether 825 050 loo 82 76-130 <br /> 1 2 Dichloroethane 861 050 100 86 77-136 <br /> Ethanol 201 100 200 100 31-143 <br /> Ethyl tert-butyl ether 845 050 100 84 81-121 <br /> Methyl tent-butyl ether 827 050 100 83 63-137 <br /> Surrogate 12-Dichloroethane-d4 561 500 112 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 staled results are reported on a wet weight basis <br /> 0 This analytical report must be reproduced in its entirety <br /> Page 35 of 41 <br />