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j <br /> 00Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> Analytical (707)792-1865 <br /> �r FAX(707)792-0342 <br /> • www.sequoialahs.com <br /> URS Corp-Sacramento Project: Arco Site 5469,Stockton,CA P406178 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 06/30/04 13:08 <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 4060423-EPA 5030B waters <br /> Blank 4060423-BLKI Prepared&Analyzed:06/18/04 <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-Dibromoethane(EDB) ND 0.50 " <br /> 1,2-DlchlnToethane ND 0.50 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0.50 " <br /> Ethyl tert-butyl ether ND 1.0 " <br /> Methyl tert-butyl ether ND 0.50 " <br /> Toluene ND 0,50 " <br /> ylenes(total) ND 0.50 " <br /> arrogate:Dibromofluoramethane 5.43 5.00 109 84-122 <br /> Surrogate:1,2-Dichloroethane-d4 5.56 5.00 111 74-135 <br /> Surrogate:Toluene-d8 5.21 5.00 104 84-119 <br /> Surrogate:4-Bromofluorobenzene 5.05 5.00 101 86-119 <br /> LaboratoryControl Sample(4060423-BSI) Arepared&A.n_alyzed•._06./_1.8/04 <br /> Tert-amyl methyl ether 4,85 1.0 ug4 <br /> 5.00 97 78-117 <br /> Benzene 5.06 0.50 5.00 101 81-118 <br /> Tert-but 1 alcohol + <br /> Y 107 20 100 107 60-147 <br /> Di-isopropyl ether 4.86 1.0 5.00 97 70-125 <br /> 1,2-Dibromoethane(EDB) 4.82 0.50 5.00 96 85-125 <br /> 1,2-Dichloroethane 5.74 0.50 5.00 115 77-126 <br /> Ethanol 270 100 100 270 55-200 QCO1 ' <br /> Ethylbenzene 4,90 0.50 5.00 9$ 89-122 <br /> i <br /> Ethyl tert-butyl ether 5.02 1.0 5.00 100 71-120 <br /> Methyl tert-butyl ether 5.26 0.50 5.00 105 70-122 <br /> Toluene 4.77 0.50 5.00 95 84-119 <br /> Xylenes(total) 14.5 0.50 15.0 97 86-132 <br /> Surrogate:Dibromofluoromethane 5.62 5.00 112 84-122 <br /> Surrogate:l,2-Dichloroethane-d4 5.72 5.00 114 74-135 <br /> Surrogate: Toluene-d8 5.11 " 5.00 102 84-119 <br /> Surrogate:4-Bromofluorobenzene 5,19 5.00 104 86-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the <br /> chain ofcusiody document. Unless otherwise stated, results are reported on a wet <br /> weight basis. This analytical report must be reproduced in its entirety. <br /> t <br /> Page 23 of 37 <br /> k <br />