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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> a- ) (707)Analytical FAX 7920865 <br /> 707)792-0342 <br /> www,sequoiatabs.com <br /> URS Corp-Sacramento Project: Arco Site 5469,Stockton,CA P305380 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 06/18/03 21:10 <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 3060010-EPA 5030 waters <br /> Blank(3060010-BLK1) Prepared&Analyzed:06/02/03 <br /> Surrogate:1,2-Dichloroethane-d4 5.07 ug/I 5.00 101 74-135 <br /> Surrogate:Toluene-d8 5.10 5.00 102 84-119 <br /> Laboratory Control Sample(3060010-BSI) Prepared&Analyzed:06/02/03 <br /> Tert-amyl methyl ether 1.01 1.0 upfl 1.00 101 70-116 <br /> Tert-butyl alcohol 28.8 20 20.0 144 62-142 <br /> Di-isopropyl ether 1.08 1.0 1.00 108 71-121 <br /> 1,2-Dibromoethane(EDB) 1.00 0.50 1.00 100 92-117 <br /> 1,2-Dichloroethane 0.994 0.50 1.00 99 79-126 <br /> Ethanol ND 100 20.0 0-200 <br /> Ethyl tert-butyl ether 0.989 1.0 1.00 99 71-110 <br /> Methyl tert-butyl ether 1.03 0.50 1.00 103 79-118 <br /> rogale:Dib romofluoromethane 5.08 5.00 102 84-122 <br /> ourrogate. 1,2-Diehloruetharre-d4 5.33 5.00 107 74-135 <br /> Surrogate:Toluene-d8 5.19 5.00 104 84-119 <br /> Laboratory Control Sample Dup(3060010-BSDI) _ Prepared&Analyzed:06/02/03 <br /> Tert-amyl methyl ether 0.904 1.0 ug/l 1.00 90 70-116 11 20 <br /> Tert-butyl alcohol 27.0 20 20.0 135 62-142 6 20 <br /> Di-isopropyl ether 0.980 1.0 1.00 98 71-121 10 20 <br /> 1,2-ā¯‘ibromoethane(ED13) 0.876 0.50 1.00 88 92-117 13 20 <br /> 1,2-Dichloroethane 0.968 0.50 1.00 97 79-126 3 20 <br /> Ethanol ASD 100 20.0 0-200 200 <br /> Ethyl tert-butyl ether 0.897 1.0 1.00 90 71-110 10 20 <br /> Methyl tert-butyl ether 0.964 0.50 1.00 96 79-118 7 20 <br /> Surrogate:Dibromofluoromethane 5.20 5.00 104 84-122 <br /> Surrogate:l,2-Dichloroethane-d4 5.17 5.00 103 74-135 <br /> Surrogate:Toluene-d8 5.21 5.00 104 84-119 <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 30 of 36 <br />