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'Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical <br /> FAX(707)792-0342 <br /> www.sequoialahs.com <br /> 0 <br /> URS Corp-Sacramento Project:Arco Site 2130,Stockton,CA P504010 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number:GOBZK-0002 Reported: <br /> Sacramento CA,95833 Project ManagerNernon P.Elarth 04/13/05 09:46 <br /> Volatile Organic Compounds by EPA Method 8260B-Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD II <br /> IY1 Result limit Units Level Result %REC Limits RPD limit Notes # <br /> Batch 5040050-EPA 5030B waters/EPA 8260B <br /> Blank(5040050-BLK1) Prepared&Analyzed:04/06/05 <br /> Tert-amyl methyl ether ND 1.0 ug/l <br /> Benzene ND 0.50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1.0 " <br /> 1,2-Dichloroethane ND 0.50 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0.50 " <br /> Ethyl Cert-bury]ether ND 1.0 " <br /> Methyl tert-butyl ether ND 0.50 " <br /> Toluene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Surrogate:Dibromo�luoromethane 4.81 5.00 96 84-121 <br /> 6urrogate:1,1-Dichloroethane-d4 4.48 5.00 90 74-135 <br /> Surrogate:Toluene-d8 4.67 5.00 93 84-119 <br /> Surrogate:4-Bromofluorobenzene 5.15 5.00 103 86-119 <br /> Laboratory Control Sample(5040050-BSI) Prepared&Analyzed:04/06/05 <br /> Tert-amyl methyl ether 4.59 1.0 ug/l 5.00 92 78-117 <br /> Benzene 4.54 0.50 5.00 91 81-118 <br /> Tert-butyl alcohol 104 20 100 104 60-147 <br /> Di-isopropyl ether 4.52 1.0 5.00 90 70-125 <br /> 1,2-Dichloroethane 4.36 0.50 5.00 87 77-126 <br /> Ethanol 95.8 100 100 96 55-200 <br /> Ethylbenzene 4.88 0.50 5.00 98 89-122 <br /> Ethyl tert-butyl ether 4.32 1.0 5.00 86 71-120 <br /> Methyl tert-butyl ether 4.54 0.50 5.00 91 70-122 <br /> Toluene 4.95 0.50 5.00 99 84-119 <br /> Xylenes(total) 14.7 0.50 15.0 98 86-132 <br /> Surrogate:Dibromofluoromethane 4.86 5.00 97 84-112 <br /> s <br /> Surrogate. 1,1-Dichloroethane-d4 4.40 5.00 88 74-135 <br /> Surrogate:Toluene-d8 4.70 5.00 94 84-119 <br /> Surrogate:4-Bromofluarobenzene 4.91 5.00 98 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 /> C) This analytical report must be reproduced in its entirety. <br /> Page 23 of 29 <br />