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a— ) <br /> Sequoia 1455 McDowell Blvd North Ste Petaluma,CA 949544 <br /> (707)792 1865 <br /> Analytical FAX(707)792-0342 <br /> www sequomlabs com <br /> URS Corp-Sacramento Project Arco Site 760,Lodi,CA P412284 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number"36622 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/13/05 08 48 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Petaluma <br /> Reporting Spike Source "/oREC RPD <br /> Analyte Result Lmid Units Level Result °/.REC Limits RPD limit Notes <br /> Batch 4120505-EPA 5030B waters/EPA 8260B <br /> Blank(4120505-BLK1) Prepared&Analyzed 12/27/04 <br /> Tert-amyl methyl ether ND 10 119/1 <br /> Benzene ND 050 " <br /> Teri-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 1 0 " <br /> 1 2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0 50 " <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 /> Surrogate Drbromofluoromethane 4 90 500 98 84-122 <br /> W-r-rog.te <br /> gate 1 2-Dichloroethane-d4 4 99 5 00 100 74-135 <br /> Toluene-d8 529 500 106 84-119 <br /> Surrogate 4-Brotnofluorobenzene 509 5 00 102 86-119 <br /> Laboratory Control Sample(4120505-BSI) Prepared&Analyzed 12/27/04 <br /> Tert-amyl methyl ether 425 1 0 ug/1 Soo 85 78-117 <br /> Benzene 458 050 Soo 92 81-118 <br /> Tert-butyl alcohol 828 20 100 83 60-147 <br /> Di-isopropyl ether 4 73 1 0 500 95 70-I25 <br /> 1,2-Dichloroethane 463 050 5 00 93 77-126 <br /> Ethanol 171 100 100 171 55-200 <br /> Ethylbenzene 476 0 50 500 95 89-122 <br /> Ethyl tert butyl ether 449 1 0 500 90 71-120 <br /> Methyl tert-butyl ether 425 050 500 85 70-122 <br /> Toluene 492 050 Soo 98 84-119 <br /> Xylenes(total) 150 050 ]5 0 100 86-132 <br /> Surrogate Drbromofluoromethane 5 02 Soo 100 84-122 <br /> Surrogate 12-Dichloroethane-d4 467 500 93 74-135 <br /> Surrogate Toluene-d8 5 34 500 107 84-119 <br /> Surrogate 4-Bromofluarobenzene 506 5 00 101 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 7 of 1 I <br />