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1455 McDowell Blvd North Ste <br /> 6) <br /> Sequoia Petaluma CA 949544 <br /> Analytical (707)792 1 <br /> FAX(707)792-0342342 <br /> www sequoialabs wm <br /> URS Corp-Sacramento Project 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 5030E waters <br /> Laboratory Control Sample Dup(4050459-BSDI) Prepared&Analyzed 05/19/04 <br /> Ter-amyl methyl ether 210 to ug/l 200 105 78-117 4 20 <br /> Benzene 19 1 050 200 96 81-118 2 20 <br /> Tert-butyl alcohol 355 20 400 89 60-147 3 20 <br /> Di-isopropyl ether 184 1 0 200 92 70-125 2 20 <br /> 1,2-Dibromoethane(EDB) 204 050 200 102 85-125 3 20 <br /> 1,2-Diehl oroethane 19 1 050 200 96 77-126 3 20 <br /> Ethanal 622 100 400 156 55-200 17 20 <br /> Ethylbenzene 204 050 200 102 89-122 3 20 <br /> Ethyl tert-butyl ether 19 7 1 0 200 98 71-120 3 20 <br /> Methyl tert butyl ether 19 1 050 200 96 70-122 3 20 <br /> Toluene 193 050 200 96 84-119 2 20 <br /> ,MlLylenes(total) 622 050 600 104 86-132 3 20 <br /> rrogale Dibromofluoromethane 5 03 500 101 84-122 <br /> Surrogate 12-Dichloroethane-d4 504 500 101 74-135 <br /> Surrogate Toluene-d8 530 500 106 84-119 <br /> Surrogate 4-Bromofluorobenzene 514 500 103 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 10 of 11 <br />