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Sequoia 1455 McDowell Blvd North Ste <br /> Petaluma,CA 949544 <br /> (707)792-1865 <br /> FAX Analytical wwseq oiWabs 342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P504013 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G097Z-0164 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 04/14/05 I6 07 <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 5040112-EPA 5030B waters/EPA 8260B <br /> Blank(5040112-BLKI) Prepared&Analyzed 04/13/05 <br /> Tert-amyl methyl ether ND 10 ug/l <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 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0 50 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tent-butyl ether ND 050 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 0 50 " <br /> urragate Dtbromofluoromethane 4 81 500 96 84-122 <br /> Surrogate 1 2-Dwhloroethane-d4 430 500 86 74-135 <br /> Surrogate Toluene-d8 4 78 5 00 96 84-119 <br /> Surrogate 4-Bromofluorobenzene 521 500 104 86-119 <br /> Laboratory Control Sample(5040112-BSI) Prepared&Analyzed 04/13/05 <br /> Tert-amyl methyl ether 4 42 1 0 uSA 500 88 78-117 <br /> Benzene 448 050 500 90 81-118 <br /> Tert-butyl alcohol 979 20 100 98 60-147 <br /> Di-isopropyl ether 451 1 0 500 90 70-125 <br /> 1 2-Dibromoethane(EDB) 490 050 500 98 85-125 <br /> 1,2-Dichloroethane 4 34 050 " 500 87 77-126 <br /> Ethanol 95 5 100 100 96 55-200 <br /> Ethylbenzene 489 050 500 98 89-122 <br /> Ethyl tert-butyl ether 4 18 1 0 Soo 84 71-120 <br /> Methyl cert-butyl ether 4 35 050 500 87 70-122 <br /> Toluene 476 0 50 500 95 84-119 <br /> Xylenes(total) 141 0 50 " 150 94 86-132 <br /> Surrogate Dibronwfluoromethane 4 74 500 95 84-122 <br /> Surrogate 12-Dichloroethane-d4 4 64 5 00 92 74-135 <br /> Surrogate Toluene-d8 477 5 00 95 84-119 <br /> Surrogate 4-Bromofluorobenzene 4 86 500 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 20 <br />