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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma, 94954 <br /> 79 <br /> `l (707)792-1865 <br /> Analytical FAX equoi 792 0342 <br /> corn FAX <br /> squoialabs cm <br /> 0 <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P406422 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 07/15/04 10 23 <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 Limas RPD Limit Notes <br /> Batch 4070076- EPA 5030B waters <br /> Laboratory Control Sample Dup(4070076-BSD1) Prepared&Analyzed 07/06/04 <br /> Tert-amyl methyl ether 451 10 ug/l 500 90 78-117 3 20 <br /> Benzene 539 050 500 108 81-118 3 20 <br /> Teri-butyl alcohol 119 20 100 119 60-147 20 20 <br /> Di-isopropyl ether 601 10 5 00 120 70-125 3 20 <br /> 1,2-Dibromoethane(EDB) 5 73 050 5 00 115 85-125 3 20 <br /> 1 2-Dichloroethane 637 050 5 00 127 77-126 06 20 QC01 <br /> Ethanol 169 100 100 169 55-200 8 20 <br /> Ethylbenzene 536 050 5 00 107 89-122 2 20 <br /> Ethyl tert-butyl ether 524 10 5 00 105 71-120 6 20 <br /> Methyl tert-butyl ether 541 050 5 00 108 70-122 6 20 <br /> Toluene 5 17 050 500 103 84-119 3 20 <br /> Antes(total) 168 050 ISO 112 86-132 2 20 <br /> gate Drbromofluoromethane 667 500 133 84-122 Sol <br /> Surrogate 12-Dichloroethane-d4 651 500 130 74-135 <br /> .Surrogate Toluene-d8 583 500 117 84-119 <br /> Surrogate 4-Bromofluorobenzene 523 500 105 86-119 <br /> uoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance wrth 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 16 of 18 <br />