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1 <br /> Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> (707)792-1865 <br /> FAX 1W Analytical ww.seq 7, labs.c 42 <br /> www.sequoialabs.com <br /> URS Corp-Sacramento Project: Arco Site 5450,Stockton,CA P402594 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36604 Reported: <br /> Sacramento CA,95833 Project Manager: Vernon P.Elartb 0311210416:07 <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 4030184-EPA 5030B waters <br /> Matrix Spike(4030184-MS1) Source:P403101-28 Prepared&Analyzed:03/09/04 <br /> Tert-amyl methyl ether 5.48 1.0 ug/1 5.00 ND 110 78-117 <br /> Benzene 5.19 0.50 5.00 ND 104 81-118 <br /> Tert-butyl alcohol 108 20 100 ND 108 60-147 <br /> Di-isopropyl ether 4.93 1.0 5.00 ND 99 70-125 <br /> 1,2-Dibromoethane(EDB) 5.50 0.50 5.00 ND 110 85-125 <br /> 1,2-Dichloroethane 5.39 0.50 5.00 ND 108 77-126 <br /> Ethanol 108 100 100 ND 108 55-200 <br /> Ethylbenzene 5.78 0.50 5.00 ND 116 89-122 <br /> Ethyl tert-butyl ether 5.19 1.0 5.00 ND 104 71-120 <br /> Methyl tent-butyl ether 5.14 0.50 5.00 ND 103 70-122 <br /> Toluene 5.65 0.50 5.00 ND 113 84-119 <br /> Xylenes(total) 17.4 0.50 15.0 0.71 111 86-132 <br /> ligplourrogate.-Dibromofluoromethane 5.08 5.00 101 84-122 <br /> Surrogate:l,2-Dichloroethane-d4 4.76 5.00 95 74-135 <br /> Surrogate:Toluene-d8 5.38 5.00 108 84-119 <br /> Surrogate:4-Bromofluorobenzene 5.31 5.00 106 86-119 <br /> Matrix Spike Dup(4030184-MSDI) Source:P403101-28 Prepared&Analyzed:03/09/04 <br /> Tert-amyl methyl ether 5.39 1.0 ugll 5.00 ND 108 78-117 2 20 <br /> Benzene 5.08 0.50 5.00 ND 102 81-118 2 20 <br /> Tert-butyl alcohol 101 20 100 ND 101 60-147 7 20 <br /> Di-isopropyl ether 4.86 1.0 5.00 ND 97 70-125 1 20 <br /> 1,2-Dibromoethane(EDB) 5.47 0.50 5.00 ND 109 85-125 0.5 20 <br /> 1,2-Dichloroethane 5.31 0.50 5.00 ND 106 77-126 1 20 <br /> Ethanol 101 100 100 ND 101 55-200 7 20 <br /> Ethylbenzene 5.57 0.50 5.00 ND 111 89-122 4 20 <br /> Ethyl tert-butyl ether 5.12 1.0 5.00 ND 102 71-120 1 20 <br /> Methyl tert-butyl ether 5.00 0.50 5.00 ND 100 70-122 3 20 <br /> Toluene 5.43 0.50 5.00 ND 109 84-119 4 20 <br /> Xylenes(total) 16.8 0.50 15.0 0.71 107 86-132 4 20 <br /> Surrogate:Dibromofluoromethane 4.95 5.00 99 84-122 <br /> Surrogate:l,2-Dichloroethane-d4 4.57 5.00 91 74-135 <br /> Surrogate.-Toluene-d8 5.01 5.00 100 84-119 <br /> Surrogate:4-Bromofluorobenzene 5.16 5.00 103 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 /> This analytical report must be reproduced in its entirety. <br /> Page 10 of 11 <br />