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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA M954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www.sequoialabsxom <br /> URS Corp-Sacramento Project: Arco Site 548,Stockton,CA P306036 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number. WR36608 Reported: <br /> Sacramento CA,95833 Project Manager: Vernon P.Elarth 06118103 15:44 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical- Petaluma <br /> Reporting Spike Source °/6REC RPA <br /> Analyte Result Limit units Level Result "/oREC Limits RPD Limit Notes <br /> Batch 3060386-EPA 5030 waters <br /> Matrix Spike Dup(3060386-MSDI_) Source:P306062-17 prepared&Analyzed:06/17/03 <br /> Ten-amyl methyl ether 4.83 1.0 ugli 5.00 ND 97 70-116 2 20 <br /> Tert-butyl alcohol 126 20 100 310 NR 62-142 34 20 Q-L1M, <br /> QR-07 <br /> Di-isopropyl ether 4.14 1.0 5.00 ND 83 71-121 3 20 <br /> 1,2-Dibromoethane(ED13) 5.58 0.50 5.00 ND 112 92-117 2 20 <br /> 1,2-Dichloroethane 5.17 0.50 5.00 ND 103 79-126 6 20 <br /> Ethyl tent-butyl ether 4.31 1.0 5.00 ND 86 71-110 2 20 <br /> Methyl tert-butyl ether 4.70 0.50 5.00 0.088 92 77-123 2 20 <br /> Surrogate:Dibromolluoromethane 5.01 5.00 100 84-121 <br /> Surrogate:1,2-Dichloroethane-d4 4.79 5.00 96 74-135 <br /> Surrogate:Toluene-d8 5.10 5.00 102 84-119 <br /> i <br /> �quoia 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 7 of 8 <br />