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i <br /> S` e u Ola 1455 McDowell Blvd,North Ste D I` 1 Petaluma,CA 949$4 <br /> Analytical (707)792-1865 <br /> FAx(707)792-0342 <br /> www.sequaialabs.com <br /> URS Corp-Sacramento Project:Arco Site 2130,Stockton,CA P504010 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number:GOAZK-0002 Reported: ! <br /> i <br /> Sacramento CA,95$33 Project Manager:Vernon P.E1arth 04/13/05 09:46 <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 5040040-EPA 5030B waters 1 EPA 8260B <br /> i <br /> Blank(5040040-BLK1) Prepared&Analyzed:04/05/05 <br /> Tert-amyl methyl ether ND 1.0 ugn <br /> Benzene ND 0.50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1.0 " <br /> 1,2-Dichloroethane ND 0.50 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0.50 <br /> Ethyltert-butylether ND 1.0 <br /> Methyl tert-butyl ether ND 0.50 " <br /> Toluene ND 0.50 " <br /> Xylenes(total) ND 0.50 <br /> ( Surrogate:Dibrbmofluoromethane 5.05 5.00 101 84-121 <br /> [ ;urrogate:l,2-Dichloroethane-d4 5.16 5.00 .103 74-135 <br /> Surrogate:Toluene-d8 4.42 5.00 88 84-119 <br /> Surrogate. 4-Bromofluorobenzene 5.17 5.00 103 86-119 <br /> Laboratory Control Sample(5040040-BSI) Prepared&Analyzed:04/05/05 <br /> Tert-amyl methy)ether 4.64 1.0 ugll 5.00 93 78-117 <br /> Benzene 4.58 0.50 5.00 92 81-118 <br /> Tert-butyl alcohol 108 20 100 108 60-147 <br /> Di-isopropyl ether 4.64 1,0 5.00 93 70-125 <br /> 1,2-Dichloroethane 5.56 0.50 5.00 111 77-126 <br /> Ethanol 77.9 100 100 78 55-200 <br /> Ethylbenzene 5.07 0.50 5.00 101 89-112 <br /> Ethyl tert-butyl ether 4.54 1.0 5.00 91 71-120 <br /> Methyl tert-butyl ether 4.77 0.50 5.00 95 70-122 <br /> Toluene 5.01 0.50 5.00 I00 84-119 <br /> Xylenes(total) 14.9 0,50 15.0 99 86-132 <br /> Surrogate:Dibr6mofluoromethane 5.41 5.00 108 84-122 <br /> Surrogate:l.2-Dichloroethane-d4 5.44 5.00 109 74-135 <br /> Surrogate:Toluene-d8 4.76 5.00 95 84-119 <br /> Surrogate;4-Bromofluorobenzene 4.73 5.00 95 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 21 of 29 <br />