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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> qW Analytical <br /> 4i) (707)792-1865 <br /> FAX(707)792-0342 <br /> www.sequoialabs.com <br /> 10 <br /> URS Corp-Sacramento Project: Arco Site 5450,Stockton,CA P402594 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36604 Reported: <br /> Sacramento CA,95833 Project Manager: Vernon P.Elarth 03/12/04 16:07 <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 4030145-EPA 5030B waters <br /> Matrix Spike(4030145-MSI) Source:P402573-05 Prepared:03/05/04 Analyzed:03/06/04 <br /> Tert-amyl methyl ether 4,90 1.0 ug/l 5.00 ND 98 78-117 <br /> Benzene 5.26 0.50 5.00 ND 105 81-118 <br /> Tert-butyl alcohol 100 20 100 5.2 95 60-147 <br /> Di-isopropyl ether 5.25 1.0 5.00 ND 105 70-125 <br /> 1,2-Dibromoethane(EDB) 5.57 0.50 5.00 ND 111 85-125 <br /> 1,2-Dichloroethanc 4.95 0.50 5.00 ND 99 77-126 <br /> Ethanol 92.4 100 100 ND 92 55-200 <br /> Ethylbenzene 4.65 0.50 5.00 ND 93 89-122 <br /> Ethyl tert-butyl ether 5.04 1.0 5.00 ND 101 71-120 <br /> Methyl tent-butyl ether 5.38 0.50 5.00 0.41 99 70-122 <br /> Toluene 4.90 0.50 5.00 ND 98 84-119 <br /> Xylenes(total) 14.6 0.50 15.0 ND 97 86-132 <br /> urrogate:Dibromofluoromethane 5.23 5.00 105 84-112 <br /> Surrogate:1,2-Dichloroethane-d4 4.85 5.00 97 74-135 <br /> Surrogate:Toluene-d8 4.44 5.00 89 84-119 <br /> Surrogate:4-Bromofluorobenzene 4.59 5.00 92 86-119 <br /> Matrix Spike Dup(4030145-MSDI) Source:P402573-05 Prepared:03/05/04 Analyzed:03/06/04 <br /> Tert-amyl methyl ether 4.76 1.0 ugll 5.00 ND 95 78-117 3 20 <br /> Benzene 5.29 0.50 5.00 ND 106 81-119 0.6 20 <br /> Tert-butyl alcohol 112 20 100 5.2 107 60-147 11 20 <br /> Di-isopropyl ether 5.25 1.0 5.00 ND 105 70-125 0 20 <br /> 1,2-Dibmmoethane(EDB) 4.61 0.50 5.00 ND 92 85-125 19 20 <br /> 1,2-Dichloroethane 5.11 0.50 5.00 ND 102 77-126 3 20 <br /> Ethanol 113 100 100 ND 113 55-200 20 20 <br /> Ethylbenzene 4.47 0.50 5.00 ND 89 89-122 4 20 <br /> Ethyl tert-butyl ether 4.76 1.0 5.00 ND 95 71-120 6 20 <br /> Methyl tent-butyl ether 5.12 0.50 5.00 0.41 94 70-122 5 20 <br /> Toluene 5.06 0.50 5.00 ND 101 84-119 3 20 <br /> Xylenes(total) 13.2 0.50 15.0 ND 88 86-132 10 20 <br /> Surrogate:Dibromofluoromethane 4.96 5.00 99 84-122 <br /> Surrogate:l,2-Dichloroethane-d4 4,99 5.00 100 74-135 <br /> Surrogate:Toluene-d8 4.77 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 8 of l l <br />