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Sequoia 1455McDoPeallumNorth <br /> oA 4t9 4 <br /> a_ _�► (707)792-1865 <br /> Analytical <br /> FAX(747)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P412405 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0164 Reported <br /> Sacramento CA,95833 Project ManagerVernon P Elarth 01/11/05 10 44 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical -Petaluma <br /> Reporting Spike Source °/9REC RPD <br /> Analyte Result Limit Units Lcvel Result %REC Limits RPD Limit Notes <br /> Batch 501:0028-EPA 5030B waters/EPA 8260B <br /> Blank(5010028-BLK1) Prepared&Analyzed 01/04/05 <br /> Tert-amyl methyl ether ND 1 0 ug11 <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 2-Dibromoethane(EDB) ND 050 " <br /> 2-Dichloroethane ND 050 <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 <br /> Ethyl tert-butyl ether ND 10 <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> urrogate Dibromofluorornethane 490 500 98 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 559 500 112 74-135 <br /> Surrogate Toluene-d8 500 Soo 100 84-119 <br /> Surrogate 4-Bromofluorobenzene 528 500 106 86-119 <br /> Laboratory Control Sample(5010028-BSI) Prepared&Analyzed 01/04/05 <br /> Tert-amyl methyl ether 589 10 ug/1 500 118 78-117 - Jld fi d d HL <br /> Benzene 524 050 500 105 81-118 <br /> Tert-butyl alcohol 102 20 100 102 60-147 <br /> Di-isopropyl ether 567 1 0 500 113 70-125 i`Gt <br /> 1,2-Dibromoethane(EDB) 548 050 500 110 85-125 <br /> 1 2-Dichloroethane 6 13 050 500 I23 77-126 Y► <br /> Ethanol 104 100 100 104 55-200 i <br /> Ethylbenzene 5 18 050 500 104 89-122 <br /> Ethyl cert-butyl ether 545 10 500 109 71-120 <br /> Methyl tert-butyl ether 584 050 500 117 70-122 <br /> Toluene 520 050 500 104 84-119 <br /> Xylenes(total) 159 050 150 106 86-132 <br /> .Surrogate Dibromofluoromethane 479 500 96 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 532 500 106 74-135 <br /> Surrogate Toluene-d8 496 500 99 84-119 <br /> Surrogate 4-Bromofluorobenzene 487 500 97 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 16 of 18 <br />