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• 1455 McDowell Blvd,North Ste D <br /> Sequoia CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www,sequoialabs.com <br /> URS Corp-Sacramento Project: Arco Site 5469,Stockton,CA P406178 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 06/30/04 13:08 <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 4060448-EPA 5030B waters <br /> Blank 4060448-BLKI Prepared&Analyzed: 06/21/04 <br /> Tert-amyl methyl ether ND 1.0 ugil <br /> Benzene ND 0.50 " <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 /> Ethylbenzene ND 0.50 " <br /> Ethyl tert-butyl ether ND 1,0 " <br /> Methyl tert-butyl ether ND 0.50 " <br /> Toluene ND 0.50 " <br /> ylenes(total) ND 0.50 " <br /> urrogate:Dihromofluoromethane 5.19 " 4.50 115 84-122 <br /> Surrogate: 1,2-Dichloroethane-d4 5.65 4.50 126 74-135 <br /> Surrogate: Toluene-d8 4.74 4.50 105 84-119 <br /> Surrogate:4-Bromofluorohenzene 4.29 4.50 95 86-119 <br /> Laboratory Control Sample(4060448-BSI) Pre ared&Analyzed:06/21/04 <br /> Tert-amyl methyl ether 4.21 1.0 ugR 5.00 84 78-117 <br /> Benzene 4.62 0.50 5.00 92 81-118 <br /> Tert-butyl alcohol 94.4 20 100 94 60-147 <br /> Di-isopropyl ether 4,70 1.0 5.00 94 70-125 <br /> 1,2-Dibromoethane(EDB) 4.47 0.50 5.00 89 85-125 <br /> 1,2-Dichloroethane 6.00 0.50 5.00 120 77-126 <br /> Ethanol 144 100 100 144 55-200 <br /> Ethylbenzene 4,54 0.50 5.00 91 89-122 <br /> Ethyl tert-butyl ether 4.60 1.0 5.00 92 71-120 <br /> Methyl tert-butyl ether 4.81 0.50 5.00 96 70-122 <br /> Toluene 4,71 0.50 5.00 94 84-119 <br /> Xylenes total <br /> y (total) 14.2 0.50 15.0 95 86_132 <br /> Surrogate:Dibromofluoromethane 5.09 4.50 113 84-122 <br /> Surrogate: 1,2-Dichloroethane-d4 5.56 4.50 124 74-135 <br /> Surrogate: Toluene-d8 4.69 4.50 104 84-119 <br /> Surrogate:4-Bromofluorohenzene 4.62 4.50 103 86-119 <br /> i <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the <br /> chain of custody document. Unless otherwise stated,results are reported on a wet <br /> weight basis. This analytical report must be reproduced in its entirety. <br /> l Page 25 of 37 <br />� 9 <br />