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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> 1:D (707)792-1865 <br /> 42 <br /> Analytical www <br /> sequoia abs om <br /> www sequoia]abs com <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P412386 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0287 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 01111105 08 02 <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 °/nREC Limits RPD Limit Notes <br /> Batch 5010022-EPA 5030B waters/EPA 8260B <br /> Blank(5010022-BLKI) Prepared&Analyzed 01/04/05 <br /> Tert amyl methyl ether ND l 0 ug/l <br /> Benzene ND 050 " <br /> Tert butyl alcohol ND 20 <br /> Di-isopropyl ether ND l 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 /> AdWylenes(total) ND 050 " <br /> rrogate Drbromofluoromethane 453 500 91 84-122 <br /> Surrogate 12-Dichloroeihane-d4 462 500 92 74-135 <br /> Surrogate Toluene-d8 515 500 103 84-119 <br /> Surrogate 4-Bromofluorobenzene 522 500 104 86-119 <br /> Laboratory Control Sample(5010022-BSI) Prepared&Analyzed 01/04/05 <br /> Tert-amyl methyl ether 1 10 1 0 ug/I 1 00 110 78-117 <br /> Benzene 0 957 050 1 00 96 81-118 <br /> Tert-butyl alcohol 176 20 200 88 60-147 <br /> Di-isopropyl ether 100 1 0 1 00 100 70-125 <br /> 1,2-Dibromoethane(EDB) 0 936 050 100 94 85425 <br /> 1 2-Dichloroethane 0 974 050 1 00 97 77-126 <br /> Ethanol 256 100 200 128 55-200 <br /> Ethylbenzene 0 941 050 100 94 89-122 <br /> Ethyl tert-butyl ether 0 982 1 0 100 98 71-120 <br /> Methyl tert-butyl ether 0 976 050 100 98 70-122 <br /> Toluene 0 983 050 100 98 84-119 <br /> Xylenes(total) 299 050 300 100 86-132 <br /> Surrogate Dibromofluoromethane 470 500 94 84-122 <br /> Surrogate 12-Drchloroethane-d4 461 500 92 74-135 <br /> Surrogate Toluene-d8 527 500 105 84 119 <br /> Surrogate 4-Bromofluorobenzene 5 14 500 103 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 12 of 15 <br />