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4 <br /> l Blvd,North Str <br /> Sequoia 1455 McDowPetaluma,CA 94954 <br /> (707)792-1965 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2I86,Stockton,CA P403321 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 03/29/04 17 13 <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 4030678-EPA 5030B waters <br /> Blank(4030678-BLKI) Prepared&Analyzed 03/24/04 <br /> Tert-amyl methyl ether ND 1 0 ug/l - <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 /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> _Xylenes(total) ND 050 " <br /> rogate Dibromofluorome than e 592 Soo 118 84-122 <br /> Surrogate 1,2-Dichloroethane-d4 662 500 132 74-135 <br /> Surrogate Toluene-d8 485 500 97 84-119 <br /> Surrogate 4-Bromofluorobenzene 5 18 500 104 86-119 <br /> Laboratory Control Sample(4030678-BS1) Prepared&Analyzed 03/24/04 <br /> Tert-amyl methyl ether 522 1 0 ug/l 5 00 104 78-117 <br /> Benzene 4 83 050 5 00 97 81-118 <br /> Tert-butyl alcohol 94 1 20 100 94 60-147 <br /> Di-isopropyl ether 5 50 1 0 5 00 110 70-125 <br /> 1,2-Dibromoethane(EDB) 524 050 5 00 105 85-125 <br /> I,2-Dichloroethane 5 53 050 5 00 111 77-126 <br /> Ethanol 927 100 100 93 55-200 <br /> Ethylbenzene 475 050 5 00 95 89-122 <br /> Ethyl tert-butyl ether 5 39 1 0 5 00 108 71-120 <br /> Methyl text-butyl ether 529 050 5 00 106 70-122 <br /> Toluene 473 0 50 500 95 84-119 <br /> Xylenes(total) 14 8 050 150 99 86-132 <br /> Surrogate Dibromofluoromethane 5 18 500 104 84-122 <br /> Surrogate I 1-Dichloroethane-d4 539 500 108 74-135 <br /> Surrogate Toluene-d8 459 500 92 84-119 <br /> Surrogate 4-Bromofluorobenzene 490 5 00 98 86-119 <br /> uoia Analytical-PetaIuma The results in this report apply to the samples analyzed in accordance with the chain <br /> ofcustody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 13 of 15 <br />