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i <br /> Sequoia 1455 McDoweIX Blvd,North Site D <br /> Petaluma,CA 94954 <br /> Analytical (707) 92-1845 <br /> FAX 7 <br /> (707)792-0342 � <br /> www,sequoialabs.com <br /> i <br /> URS Corp-Sacramento Projecr.Arco Site 5450,Stockton,CA P409110 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number:W66604 Reported: <br /> Sacramento CA,95833 Project ManagerIeff Brooks 09/16/04 15:54 <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 4090279-EPA 5030B waters <br /> Blank(4090279-BLK1) Prepared&Analyzed:09/14/04 <br /> Tert-amyl methyl ether ND 1.0 ug/1 <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 /> Xylenes(total) ND 0.50 <br /> Surrogate:Dibromofluoromethane 5.21 5.00 104 84-122 <br /> Surrogate:1,2-Dichloroethane-d4 5.00 5.00 100 74-135 <br /> Surrogate: Toluene-d& 5.32 5.00 106 84-119 <br /> Surrogate:4-Bromofluorobenzene 5.33 5.00 107 86-119 <br /> Laboratory Control Sample(4090279-BS1) Prepared&Analyzed:09/14/04 <br /> Tert-amyl methyl ether 4.67 1.0 ugfl 5.00 93 78-117 <br /> Benzene 5.24 0.50 " 5.00 105 81-118 <br /> Tert-butyl alcohol 101 20 100 101 60-147 <br /> Di-isopropyl ether 4.69 1.0 5.00 94 70-125 <br /> 1,2-Dibromoethane(EDB) 4.91 0.50 " 5.00 98 85-125 <br /> 1,2-Dichloroethane 5.00 0.50 5.00 100 77-126 <br /> Ethanol 196 100 100 196 55-200 <br /> Ethylbenzene 5.26 0.50 5.00 105 89-122 <br /> Ethyl tert-butyl ether 4.74 1.0 5.00 95 71-120 <br /> Methyl tert-butyl ether 4.88 0.50 " 5.00 98 70-122 <br /> Toluene 5.17 0.50 5.00 103 84-119 <br /> Xylenes(total) 15.6 0.50 15.0 104 86-132 <br /> Surrogate:Dibromofluoromethane 5.16 " 5.00 103 84-122 <br /> Surrogate:l,2-Dichloroethane-d4 4.98 5.00 100 74-135 <br /> Surrogate:Toluene-d8 5.46 5.00 109 84-119 <br /> Surrogate,4-Bromofluorobenzene 5.44 5.00 109 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 7 of <br />