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i1 <br /> Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> Analytical "07)792-1855 <br /> FAX(707)792-0342 <br /> www.sequoialabs.com <br /> t <br /> q <br /> i <br /> P. <br /> URS Corp-Sacramento Project:Arco Site 548,Stockton,CA P412404 <br /> 2870 Gateway Oaks Drive Suite 300 Project Nutnber:GMZ-0037 1� °' Reported: <br /> Sacramento CA,95833 Project Manager:Vernon P.Elarth,! 01/11/05 10:28 <br /> Volatile Organic Compounds by EPA Method$260B;Quality Control <br /> Sequoia Analytical -Petaluma <br /> l <br /> Reporting Spike Source iii %REC RPD <br /> i Aualyte Result limit Units Level Result 'I%REC Limits RPD Limit Notes <br /> Batch 5010022-EPA 5030B waters 1 EPA 8260B <br /> Blank(5010012-BLKI) Prepared&Analyzed:01/04/05 <br /> Tert-amyl methyl ether ND 1.0 ugll ii <br /> Benzene ND 0.50 II <br /> Tert-butyl alcohol ND 20 " <br /> i <br /> Di-isopropyl ether ND 1.0 H <br /> 1,2-Dichloroethane ND 0.50 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0.50 " <br /> Ethyl tert-butyl ether ND 1.0 <br /> Methyl ten-butyl ether ND 0.50 <br /> Toluene ND 0.50 i <br /> Xylenes(total) _- ND 0.50 j <br /> Surrogate:Dibromofluoromethane 4.53 W 5.00 ;191 84-122 <br /> Surrogate:1,2-Dichloroethane-d4 4.62 5.00 .192 74-135 <br /> Surrogate:Toluene-d8 5.15 5.00 i� 103 84-119 <br /> Surrogate:4-Bromofluorobenzene 5.22 5.00 �',I 104 86-119 <br /> Laboratory Control Sample(5010022-BSI) Prepared&Analyzed:01/04/05 <br /> Tert-amyl methyl ether 1.10 1.0 ug/1 1.00 410 78-117 <br /> Benzene 0.957 0.50 1.00 96 81-118 <br /> Tert-butyl alcohol 17.6 20 20.0 88 60.147 <br /> Di-isopropyl ether 1.00 1.0 1.00 i 100 70-125 <br /> 1,2-Dichloroethane 0.974 0.50 1.00 II,` 197 77-126 <br /> Ethanol 25.6 100 20.0 !il 128 55-200 <br /> Ethylbenzene 0.941 0.50 1.00 94 89.122 <br /> Ethyl tert-butyl ether 0.982 1.0 1.00 I{' 98 71-120 <br /> Methyl tort-butyl ether 0.976 0.50 1.00 198 70-122 <br /> ;i <br /> Toluene 0.983 0.50 1.00 98 84.119 <br /> Xylenes(total) 2,99 0.50 3.00 <br /> I; 100 86-132 <br /> Surrogate:Dibromofluoromethane 4.70 5.00 1'' 94 84-122 <br /> Surrogate:1,1-Dichloroethane d4 4.61 5.00 !I 91 74-135 <br /> Surrogate:Toluene-d8 5.27 5.00 k 105 84-119 <br /> Surrogate:4-Bromofluorobenzene 5.14 5.00 ; 103 86-119 <br /> i <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 6 of 8 <br /> J <br />