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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> Analytical (707)792-0862 <br /> FAX 707 792-0342 <br /> ` wwwscquoialabs.com <br /> URS Com-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 RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4060462-EPA 5030E waters <br /> Blank 4060462-BLK1) Prepared&Analyzed:_06/22/04 <br /> Tert-amyl methyl ether ND 1.0 ug/l <br /> Benzene ND 0.50 " <br /> Tert-butyi alcohol 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 /> AllWylenes(total) ND 0.50 " <br /> urrogare:Dibromofluoromethane 5.74 5.00 115 84-122 <br /> Surrogate: 1,1-Dichloroethane-d4 5.65 5.00 113 74-135 <br /> Surrogate: Toluene-d8 5.25 5.00 105 84-119 <br /> Surrogate:4-Bromofluorobenzene 5.21 5.00 104 86-119 <br /> Laboratory Control Sample 4060462-BSI) Prepared&Analyzed:06/22/04 <br /> Tert-amyl methyl ether 4.78 1.0 ug/I 5.00 96 78-117 <br /> Benzene 5.09 0.50 5.00 102 81-118 <br /> Tert-butyl alcohol 101 20 100 101 60-147 <br /> Di-isopropyl ether 4.93 1.0 5.00 99 70-125 <br /> 1,2-Dibromoethane(EDB) 4.57 0.50 5.00 91 85-125 <br /> 1,2-Dichloroethane 5.63 0.50 5.00 113 77.126 <br /> Ethanol 271 100 100 271 55-200 QC01 <br /> Ethylbenzene 4.88 0.50 5.00 98 89-122 <br /> Ethyl tert-butyl ether 4.89 1.0 5.00 98 71-120 <br /> Methyl tert-butyl ether 5.26 0.50 5.00 105 70-122 <br /> Toluene 5.35 0.50 5.00 107 84-119 <br /> Xylenes(total) 14.3 0.50 15.0 95 86-132 <br /> Surrogate:Dibromofluoromethane 6.02 " 5.00 120 84-122 <br /> Surrogate: 1,2-Dichloroethane-d4 5.99 5.00 120 74-135 <br /> Surrogate: Toluene-0 5.29 5.00 106 84-119 <br /> Surrogate: 4-Bromofluorobenzene 5,37 5.00 107 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 /> Page 29 of 37 <br /> : _. ; , <br />