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1455 McDowell Blvd North Ste D <br /> + Seq noiia Petaluma CA 94954 <br /> Analytical (707)792 1865 <br /> FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P403414 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 04/01/04 16 41 <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 4030800-EPA 5030B waters <br /> Laboratory Control Sample Du (4030800-BSD1) Prepared&Analyzed 03/27/04 <br /> Tert-amyl methyl ether 5 15 1 0 ug/I 5 00 103 78-117 6 20 <br /> Benzene 5 51 050 5 00 110 81-118 3 20 <br /> Tert-butyl alcohol 112 20 100 112 60-147 0 20 <br /> Di-isopropyl ether 5 05 1 0 5 00 101 70-125 5 20 <br /> 1,2-Dibromoethane(EDB) 566 050 5 00 113 85-125 5 20 <br /> 1,2-Dirhloroethane 5 56 0 50 5 00 ill 77-126 6 20 <br /> Ethanol 111 100 100 111 55-200 2 20 <br /> Ethylbenzene 5 85 050 5 00 117 89-122 3 20 <br /> Ethyl tert-butyl ether 520 1 0 5 00 104 71-120 6 20 <br /> Methyl tent-butyl ether 5 04 0 50 5 00 101 70-122 10 20 <br /> Toluene 5 58 050 5 00 112 84-119 3 20 <br /> AIIIIIIIIIIIenes(total) 17 5 0 50 15 0 117 86-132 3 20 <br /> ogate Dibromofluoromethane 494 500 99 84-122 <br /> Surrogate 12-Dichloroethane-d4 4 76 500 95 74-135 <br /> Surrogate Toluene-d8 5 10 5 00 102 84-119 <br /> Surrogate 4-Bromofluorobenzene 5 10 500 102 86-119 <br /> �oia 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 /> basis This analytical report must be reproduced in its entirety <br /> Page 9 of 10 <br />