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E - <br /> 1455 McDowell Blvd,North Ste D <br /> E setu,Q1a Petaluma,CA 94954 <br /> (707)792-1865 { <br /> Analytical FAX(707)792-0342 <br /> www.sequoialabs.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 %oREC RPD <br /> [Analyte Result Limit Units Level Result %aREC Limits RPD Limit Notes <br /> Batch 4060456-EPA 5030B waters <br /> Matrix Spike 4060456-MS1 Source:P406241-16 Prepared&Analyzed:06/21/04 <br /> Tert-amyl methyl ether 268 50 ugll 250 ND 107 78-117 <br /> Benzene 264 25 250 6.8 103 81-118 <br /> Tert-butyl alcohol 1210 1000 5000 ND 24 60-147 QM02 <br /> Di-isopropyl ether 278 50 250 ND Ill 70-125 <br /> 1,2-Dibromoethane(EDS) 267 25 250 ND 107 85-125 <br /> 1,2-Dichloroethane 271 25 250 ND 108 77-126 <br /> Ethanol 801 5000 5000 ND 16 55-200 QM02 <br /> Ethylbenzene 263 25 250 5.9 103 89-122 <br /> Ethyl tert-butyl ether 269 50 250 ND 108 71-120 <br /> Methyl tert-butyl ether 294 25 250 21 109 70-122 <br /> Toluene 254 25 250 5.1 100 84-119 <br /> ylenes(total) 848 25 750 50 106 86-132 <br /> urrogate:Dibromohuoromethane 5.77 5,00 115 84-122 <br /> Surrogate:l,2-Dichloroethane-d4 5.78 5.00 116 74-135 <br /> Surrogate:Toluene-d8 5.88 5.00 118 84-119 <br /> Surrogate:4-Bromofluorobenzene 5.35 5.00 107 86-119 <br /> Matrix Spike Dup(4060456-MSD1) Source:P406241-16 Prepared&Analyzed:06/21/04 _ <br /> Tert-amyl methyl ether 264 50 ug/l 250 ND 106 78-117 2 20 <br /> Benzene 254 25 250 6.8 99 81-i18 4 20 <br /> Tert-butyl alcohol 1210 1000 5000 ND 24 60-147 0 20 QM02 <br /> Di-isopropyl ether 274 50 250 ND 110 70-125 1 20 <br /> 1,2-Dibromoethane(EDB) 264 25 250 ND 106 85-125 1 20 <br /> 1,2-Dichloroethane 264 25 250 ND 106 77-126 3 20 <br /> Ethanol 830 5000 5000 ND 17 55-200 4 20 QM02 <br /> Ethylbenzene 256 25 250 5.9 100 89-122 3 20 <br /> Ethyl tort-butyl ether 265 50 250 ND 106 71-120 1 20 <br /> Methyl tert-butyl ether 288 25 250 21 107 70-122 2 20 <br /> Toluene 244 25 250 5.1 96 84-119 4 20 <br /> Xylenes(total) 818 25 750 50 102 86-132 4 20 <br /> Surrogate:Dibromofluoromethane 5.85 5.00 117 84-122 <br /> Surrogate: l,2-Dichloroethane-d4 5.69 5.00 114 74-135 <br /> Surrogate:Toluene-d8 5.84 5.00 117 84-119 <br /> Surrogate:4-Bromofluorobenzene 5.39 5.00 108 86-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the <br /> chain of custody document. Unless otherwise stated,results are reported on a wet <br /> weight basis. This analytical report must be reproduced in its entirety. <br /> k <br /> { <br /> Page 28 of 37 <br /> .i <br /> l <br />