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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> 1:1) (707)792-1965 <br /> qW Analytical <br /> FAX 707 792A342 <br /> wwwsequoialabs.wm <br /> URS Corp-Sacramento Project: Arco Site 5469,Stockton,CA P312283 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 01/12/04 18:12 <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 4010083-EPA 5030E waters <br /> Blank 4010083-BLK1 Prepared&Analyzed:01/07/04 <br /> Surrogate:Dibromofluoromethane 5.19 11911 5.00 104 84-122 <br /> Surrogate: 1,1-Dichloroethane-d4 5.11 5.00 102 74-135 <br /> Surrogate: Toluene-d8 4.42 5.00 88 84-119 <br /> Surrogate: 4-Bromofluorobenzene 4.67 5.00 93 86-119 <br /> Laboratory Control Sample(4010083-BS1) _ Prepared&Analyzed:01/07/04 <br /> Tert-amyl methyl ether 4.09 1.0 um 5.00 82 78-117 <br /> Benzene 4.46 0.50 5.00 89 81-118 <br /> Tert-butyl alcohol 88.8 20 100 89 60-147 <br /> Di-isopropyl ether 4,43 1.0 5.00 89 70-125 <br /> 1,2-Dibromoethane(EDB) 4,49 0.50 5.00 90 85-125 <br /> 1,2-Dichloroethane 4.81 0.50 5.00 96 77-126 <br /> thanol 87.9 100 100 88 55-200 <br /> thylbenzene 4.84 0.50 5.00 97 89-122 <br /> Ethyl tert-butyl ether 4.18 1.0 5.00 84 71-120 <br /> Methyl tert-butyl ether 4.19 0.50 5.00 84 70-122 <br /> Toluene 4.67 0.50 5.00 93 84-119 <br /> Xylenes(total) 14.5 0.50 15.0 97 86-132 <br /> Surrogate: Dibromofluoromethane 5.16 5.00 103 84-122 <br /> Surrogate: 1,2-Dichloroethane-d4 4.94 5.00 99 74-135 <br /> Surrogate: Toluene-d8 4.75 5.00 95 84-119 <br /> Surrogate: 4-Bromofluorobenzene 5.11 5.00 102 86419 <br /> Laboratory Control Sample Dun(4010083-BSDI) Prepared&Analyzed:01107104_ <br /> Tert-amyl methyl ether 4.34 1.0 um 5.00 87 78-117 6 20 <br /> Benzene 4,70 0.50 5.00 94 81-118 5 20 <br /> Tert-butyl alcohol 97.3 20 100 97 60-147 9 20 <br /> Di-isopropyl ether 4.60 LO 5.00 92 70-125 4 20 <br /> 1,2-Dibromoethane(EDB) 4.86 0.50 5.00 97 85-125 8 20 <br /> 1,2-Dichloroethanc 5.17 0.50 5.00 103 77-126 7 20 <br /> Ethanol 95.3 100 100 95 55-200 9 20 <br /> Ethylbenzene 5,06 0.50 5.00 101 89-122 4 20 <br /> Ethyl tert-butyl ether 4.37 1.0 5.00 87 71-120 4 20 <br /> Methyl tert-butyl ether 4.35 0.50 5.00 87 70-122 4 20 <br /> Toluene 4.96 0.50 5.00 99 84-119 6 20 <br /> Xylenes(total) 15.3 0.50 15.0 102 86-132 5 20 <br /> Surrogate:Dibromofluoromethane 5.12 5.00 102 84-122 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document. Unless otherwise stated, results are reported on a wet weight <br /> 0 basis. This analytical report must be reproduced in its entirety. <br /> Page 31 of 40 <br />