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i <br /> 6. <br /> Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> - (707)792-1865 <br /> Analytical <br /> '•� 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 %REC RPA <br /> Analyte Result Limit units Level Result %REC Limits RPD Limit Notes <br /> Batch 4060448-EPA 5030B waters <br /> Matrix Spike 4060448-MSI) Source:P406178-08RE1 Pre ared&Analyzed:06/21/04 <br /> Tert-amyl methyl ether 5140 1000 ug/l 5000 ND 103 78-117 <br /> Benzene 6920 500 5000 1200 114 81-118 <br /> Tert-butyl alcohol 90800 20000 100000 ND 91 60-147 <br /> Di-isopropyl ether 5820 1000 5000 ND H6 70-125 <br /> 1,2-Dibromoethane(EDB) 5500 500 5000 ND 110 85-125 <br /> 1,2-Dichloroethane 7590 500 5000 ND 152 77.126 QC01 <br /> Ethanol 67600 100000 100000 ND 68 55-200 <br /> Ethylbenzene 5550 500 5000 ND 111 89-122 <br /> Ethyl tert-butyl ether 5890 1000 5000 ND 118 71-120 <br /> Methyl tert-butyl ether 37100 500 5000 32000 102 70-122 <br /> Toluene 5600 500 5000 ND 112 84-119 <br /> ylenes(total) 16800 500 15000 IND 112 86-132 <br /> urrogate:Dibromofluoromethane 5.23 4.50 116 84-112 <br /> Surrogate: 1,2-Dichloroethane-d4 5.85 4.50 130 74-135 <br /> Surrogate: Toluene-d8 4.69 4.50 104 84-119 <br /> Surrogate:4-Bromofluorobenzene 4.57 4.50 102 86-119 <br /> Matrix Spike Dup(4060448-MS_DI) Source:P406178-08RE1 — Prepared&Analyzed:06_/21/04 <br /> Tert-amyl methyl ether 5420 1000 ug/1 5000 ND 108 78-117 5 20 <br /> Benzene 7120 500 5000 1200 118 81-118 3 20 <br /> Tert-butyl alcohol 1.26000 20000 100000 ND 126 60-147 32 20 QC21 <br /> Di-isopropyl ether 6050 1000 5000 ND 121 70-125 4 20 <br /> 1,2-Dibromoethane(EDB) 5510 500 5000 ND 110 85-125 0.2 20 <br /> 1,2-Dichloroethane 7640 500 5000 ND 153 77-126 0.7 20 QC01 <br /> Ethanol 119000 100000 100000 ND 119 55-200 55 20 QC21 <br /> Ethylbenzene 5610 500 5000 ND 112 89-122 1 20 <br /> Ethyl tert-butyl ether 5930 1000 5000 ND 119 71-120 0.7 20 <br /> Methyl tent-butyl ether 39300 500 5000 32000 146 70-122 6 20 QC01 <br /> Toluene 5920 S00 5000 ND 118 84-119 6 20 <br /> Xylenes(total) 17100 500 15000 ND 114 86-132 2 20 <br /> Surrogate:Dibromofluoromethane 5,28 4.50 117 84-121 <br /> Surrogate: 1,2-Dichloroethane-d4 5,85 4.50 130 74-735 <br /> Surrogate: Toluene-d8 4,66 4.50 104 84-119 <br /> Surrogate:4-Bromofluorobenzene 4.61 4.50 101 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 /> 0 weight basis. This analytical report must be reproduced in its entirety. <br /> i Page 26 of 37 <br /> f <br />