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(Dā€” 1455 McDowell Blvd North SteSequoia Petaluma CA 949544ā–ŗ Analytical FAX(707)792 1865 <br /> (707)792 0342 <br /> www sequoialabs coin <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P312630 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 01/13/04 17 22 <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 4010016-EPA 5030B waters <br /> Laboratory Control Sample Du 4010016-BSDI Prepared&Ana! zed 01/05/04 <br /> Tert-amyl methyl ether 435 1 0 ug/l 5 00 87 78-117 3 20 <br /> Benzene 4 91 050 5 00 98 81-118 4 20 <br /> Tert-butyl alcohol 93 3 20 100 93 60-147 2 20 <br /> Di-isopropyl ether 4 83 1 0 5 00 97 70-125 3 20 <br /> 1,2-Dibromoethane(EDB) 4 92 0 50 500 98 85-125 0 20 <br /> 1,2-Dichloroethane 5 10 050 5 00 102 77-126 0 4 20 <br /> Ethanol 104 100 100 104 55-200 16 20 <br /> Ethylbenzene 5 21 050 5 00 104 89-122 0 2 20 <br /> Ethyl tert-butyl ether 4 56 1 0 5 00 91 71-120 2 20 <br /> Methyl tert-butyl ether 4 51 0 50 5 00 90 70-122 0 9 20 <br /> Toluene 5 05 0 50 500 101 84-119 2 20 <br /> ylenes(total) 159 0 50 15 0 106 86-132 2 20 <br /> arrogate Dibromojluoromethane 5 16 5 00 103 84-122 <br /> Surrogate 12-Dichloroethane-d4 4 89 5 00 98 74-135 <br /> Surrogate Toluene-d8 4 68 5 00 94 84-119 <br /> Surrogate 4-Bromofluorobenzene 4 89 5 00 98 86419 <br /> Sequoia Analytical-Petaluma The results to 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 /> basis This analytical report must be reproduced in its entirety <br /> Page 8 of 9 <br />