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r� <br /> Sequoia 1455 McDowell Blvd,North Ste D <br /> i. A Petaluma,CA 94954 <br /> { Analytical aZ (707)792-1865 <br /> 1 L FAX(707)792-0342 <br /> www.sequoialabs.com <br /> URS Corp-Sacramento � <br /> Project:Arco Site 548,Stockton,CA P412404 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number.G09JZ-0037 Reported: <br /> 1 Sacramento CA,95833 Project Manager:Vemon P.Elarth.j 01/11/05 10:28 <br /> ` Volatile Organic Compounds by EPA Method 8260B <br /> Quality Control <br />{ Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result 6°7uRE'C Limits RPD Limit Notes <br /> Batch 5010022-EPA 5030B waters 1 EPA 8260B <br /> Laboratory Control Sample Dup(5010022-BSDI) Prepared&AnalyzedAl/04/05 <br /> Tert-amyl methyl ether 1.07 1.0 ug/1 1.00 107 78-117 3 20 <br /> Benzene 0.944 0.50 1.00 94 81-118 1 20 <br /> Tort-butyl alcohol 17.7 20 20.0 88 60.147 0.6 20 <br /> Di-isopropyl ether 1.02 1.0 1.00 102 70-125 2 20 <br /> r 1,2-Dichloroethane 0.971 0.50 1.00 97 77-126 0.3 20 <br /> Ethanol 26.5 100 20.0 132 55-200 3 '20 <br /> Ethylbenzene 0.938 0.50 1.00 94 89-122 0.3 20 <br /> Ethyl tert-butyl ether 0.985 1.0 1.00 98 71-120 0.3 20 <br /> Methyl tort-butyl ether 0.959 0.50 1.00 <br /> Toluene 96 70-122 2 20 <br /> 1.0] 0.50 1.00 101 84-119 3 20 <br />' Xylenes(total) 2.92 0.50 3.00 97 86-132 2, 20 <br /> Surrogate:DibromofluoromeMane 4.77 5.00 95 84-121 <br /> Surrogate:1,2-Dichloroethane-d4 4.57 5.00 91 74-135 <br /> Surrogate:Toluene-d8 5.31 5.00 106 84-119 <br /> Surrogate:4-Bromofluorobenzene 5.13 5.00 103 86-119 <br /> 3 <br /> tl <br /> I <br /> r <br /> I# <br /> Sequoia Analytical-Petaluma The results in this report p pply 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 /> I Page 7 of 8 <br />