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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma, 94954 <br /> 792-1865 <br /> 9 <br /> (707)79z-1 s6s <br /> Analytical www wwsequ')'9z-0342 <br /> wequoialabs cam <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P409397 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number]ntrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/06/04 14 29 <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 4100058-EPA 5030B waters 1 EPA 8260B <br /> Blank(4100058-BLK1) Prepared&Analyzed 10/04/04 <br /> Tert-amyl methyl ether ND 10 ug/I <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> DI-Isopropyl ether ND 10 " <br /> 1,2-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 /> Xylenes(total) ND 050 " <br /> togate Dibromo/luoromethane 442 Soo 88 84-122 <br /> ogate 1 2-Dichloroethane-d4 423 500 85 74-135 <br /> Surrogate Toluene-d8 542 Soo 108 84-119 <br /> Surrogate 4-Bromgfluorobenzene 513 500 103 86-119 <br /> Laboratory Control!Sample(4100058-BSI) Prepared&Analyzed 10/04/04 <br /> Tert-amyl methyl ether 1 06 10 ugll 1 00 106 78 117 <br /> Benzene 1 11 050 1 00 111 81-118 <br /> Tert-butyl alcohol 198 20 200 99 60-147 <br /> Di-isopropyl ether 106 10 100 106 70-125 <br /> 1,2-Dichloroethane 0 891 050 1 00 89 77-126 <br /> Ethanol 207 100 200 104 55-200 <br /> Ethylbcnzene 1 12 050 100 112 89-122 <br /> Ethyl tert-butyl ether 0 945 10 1 00 94 71-120 <br /> Methyl tent-butyl ether 0 929 050 100 93 70-122 <br /> Toluene 120 050 100 120 84-119 HL <br /> Xylenes(total) 330 050 300 110 86-132 <br /> Surrogate Dibromofluoromethane 457 500 91 84-122 <br /> Surrogate 12-Dichloroeihane-d4 413 Soo 83 74-135 <br /> Surrogate Toluene d8 537 300 107 84 119 <br /> Surrogate 4-Bromgfluorobenzene 518 500 104 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 /> This analytical report must be reproduced in its entirety <br /> Page 27 of 29 <br />