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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma CA 94954 <br /> (707)792-1865 <br /> qWAnalytical FAX(707)792-0342 <br /> www.sequoiaiabs.com <br /> I <br /> URS Corp-Sacramento Project: Arco Site 5450,Stockton,CA P308382 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36604 Reported: <br /> Sacramento CA,95833 Project Manager: Vernon P.Elarth 09/03/03 15:55 <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 3080541-EPA 5030 waters <br /> Blank(3080541-BLK1) Prepared&Analyzed:08/27/03 <br /> Tert-amyl methyl ether ND 1.0 ug/l <br /> Benzene ND 0.50 " <br /> Tert-butyl 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 /> Xylenes(total) ND 0.50 " <br /> rrogate:Dibromofluoromethane 4.93 4.50 110 84-112 <br /> Surrogate:l,2-Dichloroethane-d4 4.73 4.50 105 74-135 <br /> Surrogate: Toluene-d8 4.73 4.50 105 84-119 <br /> Surrogate:4-Bromofluorobenzene 4.51 4.50 100 86-119 <br /> Laboratory Control Sample 3080541-BSI) Prepared&Analyzed:08/27/03 <br /> Tert-amyl methyl ether 4.51 1.0 ugll 5.00 90 70-116 <br /> Benzene 4.73 0.50 5.00 95 81-118 <br /> Teri-butyl alcohol 88.5 20 100 88 62-142 <br /> Di-isopropyl ether 4.88 1.0 5.00 98 71-121 <br /> 1,2-Dibromoethane(EDB) 4.92 0.50 5.00 98 92-117 <br /> 1,2-Dichloroethane 4.59 0.50 5.00 92 79-126 <br /> Ethyl tert-butyl ether 4.67 1.0 5.00 93 71-110 <br /> Methyl tert-butyl ether 4.57 0.50 5.00 91 77-123 <br /> Toluene 4.83 0.50 5.00 97 84-119 <br /> Surrogate:Dibromofluoromethane 4.80 4.50 107 84-122 <br /> Surrogate: 1,2-Dichloroethane-d4 4.74 4.50 105 74-135 <br /> Surrogate: Toluene-d8 4.84 4.50 108 84-119 <br /> Surrogate:4-Bromofluorobenzene 4.76 4.50 106 86-119 <br /> I. <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document. Unless otherwise stated,results are reported on a wet weight <br /> 0 basis. This analytical report must be reproduced in its entirety. <br /> Page 7 of 9 <br />