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1455 McDowPetaluma CA 949544 <br /> l Blvd North Ste D <br /> Sequoia (707)792-1865 <br /> Analytical www <br /> 7)792-0342 <br /> wwtiv equoiala6s cam <br /> er <br /> URS Corp-Sacramento Project Arco Site 760,Lodi,CA P412284 <br />�4 2870 Gateway Oaks Drive Suite 300 Project Number WR36622 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/13/05 08 48 <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 5010120-EPA 5030B waters 1 EPA 82608 <br /> Blank(5010120-BLKI) Prepared&Analyzed 01/10/05 <br /> Tert-amyl methyl ether ND 1 0 ugA <br /> Benzene ND 0 50 <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 1 0 " <br /> 12 Dibromoethane(EDB) ND 0 50 i <br /> 1 2-Dichloroethane ND 0 50 <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0 50 11 <br /> Ethyl tert-butyl ether ND 1 0 <br /> Methyl tert-butyl ether ND 050 <br /> Toluene ND 050 " <br /> ylenes(total) ND 050 " <br /> XRWurrogate Dibromofluoromethane 5 22 500 104 84-122 <br /> Surrogate 12-Dichloroethane-d4 527 500 105 74-135 <br /> Surrogate Toluene-d8 527 500 105 84-119 <br /> Surrogate 4-Bromofluorobenzene 527 500 105 86-119 <br /> Laboratory Control Sample(5010120-BSI) Prepared&Analyzed 01/10/05 <br /> Tert-amyl methyl ether 477 1 0 ugh 500 95 78-117 <br /> Benzene 4 88 0 50 500 98 81-118 <br /> Tert-butyl alcohol 913 20 100 91 60-147 <br /> Dt-isopropyl ether 487 1 0 500 97 70-125 <br /> 1,2-Dibromoethane(EDB) 481 0 50 I' 500 96 85-125 <br /> 1,2-Dichloroethane 520 050 500 104 77-126 <br /> Ethanol 264 100 100 264 55-200 DL <br /> Ethylbenzene 524 050 " 500 105 89-122 <br /> Ethyl tert-butyl ether 474 1 0 500 95 71-120 <br /> Methyl Cert-butyl ether 4 72 0 50 500 94 70-122 <br /> Toluene 503 0 50 500 101 84-119 <br /> Xylenes(total) 15 8 050 150 105 86-132 <br /> Surrogate IDibromofluoromethane 5 22 5 00 104 84-122 <br /> Surrogate 12-Dichloroethane-d4 508 5 00 102 74-135 <br /> Surrogate Toluene-d8 528 300 106 84-119 <br /> Surrogate 4-Brornof7uorobenzene 548 300 110 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 9 of 11 <br />