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3455 McDowell Blvd North Ste <br /> Sequoia Petaluma,CA44954 <br /> (747)792 1865 <br /> FAX Analytical www <br /> labsco92 2 <br /> www seguoialabs com <br /> URS Corp-Sacramento Project Arco Site 760,Lodi,CA P410096 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36622 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/20/04 17 30 <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 %uREC Limits RPD Limit Notes <br /> Batch 4100375-EPA 5030B waters/EPA 8260E <br /> Blank(4100375-BLKI) Prepared&Analyzed 10/15/04 <br /> Tert-amyl methyl ether ND 10 ug/1 <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 12-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 /> Penes(total) ND 050 " <br /> rrogate Dibromofluoromethane 479 500 96 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 453 500 91 74-135 <br /> Surrogate Toluene-d8 510 500 102 84-119 <br /> Surrogate 4-Bromofluorobenzene 555 500 111 86-119 <br /> Laboratory Control Sample(4100375-BSI) Prepared&Analyzed 10/15/04 <br /> Tert-amyl methyl ether 493 1 0 ug/I 500 99 78-117 <br /> Benzene 470 050 Soo 94 81-118 <br /> Tert-butyl alcohol 995 20 100 100 60-147 <br /> Di-isopropyl ether 472 10 500 94 70-125 <br /> 1 2-Dibromoethane(EDB) 525 050 Soo 105 85-125 <br /> 1 2-Dichloroethane 452 050 Soo 90 77-126 <br /> Ethanol 853 100 100 85 55-200 <br /> Ethylbenzene 545 050 500 109 89-122 <br /> Ethyl cert-butyl ether 485 10 500 97 71-120 <br /> Methyl tert-butyl ether 475 050 500 95 70-122 <br /> Toluene 524 050 500 105 84-119 <br /> Xylenes(total) 157 050 150 105 86-132 <br /> Surrogate Drbromofluoromethane 494 500 99 84-122 <br /> Surrogate 1 2-Dichloroethane d4 456 500 91 74-135 <br /> Surrogate Toluene-d8 520 500 104 84-119 <br /> Surrogate 4-Bromofluorobenzene 541 500 108 86-119 <br /> Sequoia Analytical-Petaluma The results to 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 />