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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> '' (707)792-1865 <br /> Analytical FAX(707)792.0342 <br /> www_sequoialabs.com <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 06/18/03 15:44 <br /> Volatile Organic Compounds by EPA Method 8260E-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 3060377-EPA 5030 waters <br /> Blank(3060377-BLKI) Prepared&Analyzed:06/16/03 <br /> Tert-amyl methyl ether ND 1.0 U911 <br /> Tert-butyl alcohol ND 20 ^ <br /> Di-isopropyl ether ND 1.0 " <br /> 1,2-Dibromoethane(EDB) ND 0.50 " <br /> 1,2-Dichloroethane ND 0.50 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 1.0 " <br /> Methyl tett-butyl ether ND 0.50 " <br /> Surrogate:Dibromofluoromethane 4.80 5.00 96 84-122 <br /> Surrogate:1,2-Dichloroethane-d4 4.87 5.00 97 74-135 <br /> Surrogate..Toluene-d8 5.08 5.00 101 84-119 <br /> mLaboratory Control Sample(3060377-BSI) Prepared&Analyzed:06/16/03 <br /> -amyl methyl ether 4.88 1.0 ugll 5.00 98 70-116 <br /> Tert-butyl alcohol 116 20 100 116 62-142 <br /> Di-isopropyl ether 4.92 1.0 " 5.00 98 71-121 <br /> i,2-Dibromoethane(EDB) 4.92 0.50 5.00 98 92-117 <br /> 1,2-Dichloroethane 5.16 0.50 5.00 103 79-126 <br /> Ethyl ter-butyl ether 4.73 1.0 5.00 95 71-110 <br /> Methyl tert-butyl ether 5.02 0.50 5.00 100 77-123 <br /> Surrogate:Dibromofluoromethane 4.81 5.00 96 84-122 <br /> Surrogate:l,2-Dichloroethane-d4 4.94 5.00 99 74-135 <br /> Surrogate:Toluene-d8 5.17 5.00 103 84-119 <br /> Laboratory Control Sample Dnp(3060377-BSDI) Prepared&Analyzed:06/16/03 -_ <br /> Tert-amyl methyl ether 4.87 1.0 ugR 5.00 97 70-116 0.2 20 <br /> Tert-butyl alcohol 117 20 " 100 117 62-142 0.9 20 <br /> Di-isopropyl ether 4.90 1.0 5,00 98 71-121 0.4 20 <br /> 1,2-Dibromoethane(EDB) 5.01 0.50 5.00 100 92-117 2 20 <br /> 1,2-Dichloroethane 5.25 0.50 5.00 105 79-126 2 20 <br /> Ethyl tert-butyl ether 4.74 1.0 5.00 95 71-110 0.2 20 <br /> Methyl tort-butyl ether 5.04 0.50 5.00 101 77-123 0.4 20 <br /> Surrogate:Dibromofluoromethane 4.76 5.00 95 84-112 <br /> Surrogate:l,2-Dichloroethane-d4 5.11 5.00 102 74-135 <br /> Surrogate:Toluene-d8 5.12 " 5.00 102 84-119 <br /> quoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> j 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 5 of 8 <br />