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1455 McDowell Blvd,North Ste D <br /> t5� Sequoia Petaluma, <br /> 707)7921865 <br /> � Analytical www <br /> labsco2 <br /> www sequotalabs coin <br /> 0 <br /> URS Corp-Sacramento Project Arco Site 760,Lodi,CA P407056 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36622 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/26/04 11 37 <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 4070265-EPA 5030B waters <br /> Blank(4070265-BLKI) Prepared&Analyzed 07/15/04 <br /> "Pert-amyl methyl ether ND 10 ug/I <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 <br /> 1 2-Dibromoethane(EDB) ND 050 <br /> 12 Dichloroethane ND 0 50 <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 /> q'rogate Dibromofluoromethane 452 400 113 84-122 <br /> arrogate 1 2-Dichloroethane-d4 454 400 114 74-135 <br /> Surrogate Toluene-d8 4491 400 112 84-119 <br /> I <br /> Surrogate 4-BromoJluorobenzene 398 400 100 86-119 <br /> Laboratory Control Sample(4070265-BSI) Prepared&Analyzed 07/15/04 <br /> Tert-amyl methyl ether 4 83 10 ug/1 500 97 78-117 <br /> Benzene 474 050 500 95 81-118 <br /> Tert-butyl alcohol 115 20 100 115 60-147 <br /> Di-isopropyl ether 5 11 10 500 102 70-125 <br /> 1 2-Dibromoethane(EDB) 5 15 050 500 103 85-125 <br /> 1,2 Dichloroethane 5 16 050 500 103 77-126 <br /> Ethanol 130 100 100 130 55-200 <br /> Ethylbenzene 497 050 500 99 89-122 <br /> Ethyl tert-butyl ether 4 85 10 5 00 97 71-120 <br /> Methyl tert-butyl ether 507 050 500 101 70-122 <br /> Toluene 4 84 050 500 97 84-119 <br /> Xylenes(total) 150 050 ]so 100 86-132 <br /> Surrogate Dibromofluoromethane 443 400 111 84-122 <br /> Surrogate 1 2-Dichloroeihane-d4 442 400 110 74-135 <br /> Surrogate Toluene-d8 444 400 111 84-119 <br /> Surrogate 4-Bromofluorobenzene 435 400 109 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 /> 0 <br /> Page 7 of 12 <br />