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i <br /> 1455 McDowell Blvd North Ste <br /> (1) Sequoia Petaluma CA 949544 <br /> (707)792-1665 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Pr4lect Arco Site 2186,Stockton,CA P405138 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 05/27/04 18 30 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4050459-EPA 5030B waters <br /> Blank(4050459-BLK1) Prepared&Analyzed 05/19/04 <br /> Tert-amyl methyl ether ND 1 0 ugll <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> I 2-Dibromoethane(EDB) ND 050 " <br /> I 2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Ad&ylenes(total) ND 050 " <br /> "Wrrogate Dibromofluoromethane 5 08 500 102 84-122 <br /> Surrogate 12-Dichloroethane-d4 5 17 500 103 74-135 <br /> Surrogate Toluene-d8 5 19 500 104 84-119 <br /> Surrogate 4-Bromofluorobenzene 5 14 5 00 103 86-119 <br /> Laboratory Control Sample(4050459-BSI) Prepared&Analyzed 05/19/04 <br /> Tert-amyl methyl ether 20 2 1 0 ugll 200 101 78-117 <br /> Benzene 188 050 200 94 81-118 <br /> Tert-butyl alcohol 345 20 400 86 60-147 <br /> Di-isopropyl ether 181 1 0 20 0 90 70-125 <br /> 1,2-Dibromoethane(EDB) 197 050 200 98 85-125 <br /> 1 2-Dichloroethane 186 050 200 93 77-126 <br /> Ethanol 735 100 400 184 55-200 <br /> Ethylbenzene 197 050 200 98 89-122 <br /> Ethyl tert-butyl ether 19 2 1 0 200 96 71-120 <br /> Methyl tert-butyl ether 18 5 050 200 92 70-122 <br /> Toluene 190 050 200 95 84-119 <br /> Xylenes(total) 603 050 600 100 86-132 <br /> Surrogate Dibromofluoromethane 492 500 98 84-122 <br /> Surrogate 12-Dichloroethane-d4 507 500 101 74-135 <br /> Surrogate Toluene-d8 532 500 106 84-119 <br /> Surrogate 4-Bromofluorobenzene 511 500 102 86-119 <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 9 of 11 <br />