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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (D- <br /> Analytical (707)792-€865 <br /> FAX(707)792-0342 <br /> • www.sequoialabs.com <br /> URS Corp-Sacramento Project: Arco Site 5469,Stockton,CA P312283 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 01/12/04 18:12 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical- Petaluma <br /> Reporting Spike Source %REC RPC) <br /> Analyte Result Limit Units level Result %REC Limits RPD Limit Notes <br /> Batch 3120679-EPA 5030E waters <br /> Blank 3120679-BLK1 Pre ared&Analyzed: 12/23/03 <br /> Tert-amyl methyl ether ND 1.0 ugtl <br /> Benzene ND 0.50 " <br /> Tett-butyl alcobol ND 20 " <br /> Di-isopropyl ether ND 1.0 " <br /> 1,2-Dibromoethane(EDB) ND 0.50 " <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 tert-butyl ether ND 0.50 " <br /> Toluene ND 0.50 <br /> ylenes(total) ND 0.50 " <br /> urrogate:Dibromofluoromethane 5 01 5.00 100 84-112 <br /> Surrogate: l,2-Dichloroethane-d4 5.13 5.00 103 74-135 <br /> Surrogate: Toluene-d8 4.49 5.00 90 84-119 <br /> Surrogate:4-Bromofluorobenzene 4.77 5.00 95 86-119 <br /> Laboratory Control Sample(3120679-BS1) Prepared&Analyzed: 12/23/03 <br /> Tert-amyl methyl ether 4.86 1.0 ugA 5.00 97 78-117 <br /> Benzene 5.28 0.50 5.00 106 81-118 <br /> Tert-butyl alcohol 99.7 20 100 100 60-147 <br /> Di-isopropyl ether 5.29 1.0 5.00 106 70-125 <br /> 1,2-Dibromoethane(EDB) 4.99 0,50 5.00 100 85-125 <br /> 1,2-Dichloroethane 5.45 0,50 5,00 109 77-126 <br /> Ethanol 109 100 100 109 55-200 <br /> Ethylbenzene 5.38 0,50 5.00 108 89-122 <br /> Ethyl tert-butyl ether 4.90 1.0 5.00 98 71-120 <br /> Methyl tert-butyl ether 4.87 0,50 5.00 97 70-122 <br /> Toluene 5.35 0.50 5.00 107 84-119 <br /> Xylenes(total) 15.9 0.50 15.0 106 86-132 <br /> Surrogate:Dihrom ofluorom ethane 4.88 5.00 98 84-122 <br /> Surrogate: 1,2-Dichloroethane-d4 4.85 5.00 97 74-135 <br /> Surrogate: Toluene-d8 4.63 5.00 93 84-119 <br /> Surrogate:4-Bromofluorobenzene 5.04 5.00 101 86-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document. Unless otherwise stated,results are reported on a wet weight <br /> basis, This analytical report must be reproduced in its entirety. <br /> Page 29 of 40 <br />