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i <br /> 1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (907)792-1865865 <br /> FAX(707)792.0342 <br /> Analytical <br /> www sequoialabs cunt <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 °/nREC RPD <br /> Analyte Result Limit Units Level Result %RFC Limits RPD Limit Notes <br /> Batch 4100304-EPA 50308 waters 1 EPA 8260E <br /> Blank(4100304-BLKI) Prepared&Analyzed 10/13/04 <br /> Tett-amyl methyl ether ND 10 ug/I <br /> Benzene ND 050 " <br /> Teri-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 0 50 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl ter(-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 0 50 " <br /> Toluene ND 0 50 " <br /> lenes(total) ND 050 " <br /> arrogate Dibromofluoromethane 5 31 500 106 84-122 <br /> Surrogate 1 2-Dichloroethane-4`4 5 44 500 109 74-135 <br /> Surrogate Toluene-d8 5 75 500 115 84-119 <br /> Surrogate 4-Bromofluorobenzene 5 17 500 103 86-119 <br /> Laboratory Control Sample(4100304-BSI) Prepared&Analyzed 10/13/04 <br /> Tert-amyl methyl ether 5 54 1 0 ugll 500 111 78-117 <br /> Benzene 547 050 500 109 81-118 <br /> Tert-butyl alcohol 826 20 100 83 60-147 <br /> Di-isopropyl ether 526 10 500 105 70-125 <br /> 1,2-Dibromoethane(EDB) 5 38 050 500 108 85-125 <br /> 1,2-Dichloroethane 5 17 050 500 103 77-126 <br /> Ethanol 108 100 100 108 55-200 <br /> Ethylbenzene 530 050 500 106 89-122 <br /> Ethyl tert-butyl ether 548 10 " 500 110 71-120 <br /> Methyl tert-butyl ether 6 05 050 500 121 70-122 <br /> Toluene 529 050 500 106 84-119 <br /> Xylenes(total) 160 050 150 107 86-132 <br /> Surrogate Dibromofluoromethane 545 5 00 109 84-122 <br /> Surrogate 12 Dichloroethane-d4 533 5 00 107 74-135 <br /> Surrogate Toluene-d8 5 84 500 117 84-119 <br /> Surrogate 4-Bromofluorobenzene 5 19 5 00 104 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 /> Thus analytical report must be reproduced in its entirety <br /> Page 7 of 11 <br />