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Sequoia 1455 McDowell Blum North Ste D <br /> Petaluma CA 94954 <br /> (707)792 1865 <br /> a— ) <br /> Analytical FAX(707)792-0342 <br /> www sequolalabs corn. <br /> s <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P402493 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 03/17/04 15 30 <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 4030015-EPA 5030D soils McOH <br /> Blank 4030015-BLKI Prepared&Analyzed 03/01/04 <br /> Tert-amyl methyl ether ND 10 mg/kg <br /> Benzene ND 10 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dtbromoethane(EDB) ND 1 0 " <br /> 1,2-Dichloroethane ND 10 " <br /> Ethanol ND 40 " <br /> Ethylbenzene ND 10 " <br /> Ethyl tent-butyl ether ND 1 0 <br /> Methyl tert-butyl ether ND 1 0 " <br /> Toluene ND 1 0 " <br /> lenes(total) ND 040 " <br /> agate Dihromofluoromethane 207 2 00 104 81-126 <br /> Surrogate 12-Dichloroethane-d4 2 08 2 00 104 73-131 <br /> Surrogate Toluene-d8 1 95 2 00 98 82-129 <br /> Laboratory Control Sample 4030015-BS1 Prepared&Analyzed 03/01/04 <br /> Tert-amyl methyl ether 2 02 1 0 mg/kg 2 00 101 74-126 <br /> Benzene 2 14 1 0 2 00 107 75-123 <br /> Tert-butyl alcohol 41 6 20 400 104 66-129 <br /> Di-isopropyl ether 222 1 0 2 00 1 1 1 71-127 <br /> 1,2-Dibromoethane(EDB) 2 14 1 0 2 00 107 88-118 <br /> 1,2-Dichloroethane 2 01 1 0 2 00 100 79-119 <br /> Ethanol 41 9 40 40 0 105 70-140 <br /> Ethylbenzene 228 1 0 200 114 65-135 <br /> Ethyl tert-butyl ether 2 13 1 0 2 00 106 72-123 <br /> Methyl Cert-butyl ether 2 08 1 0 2 00 104 70-125 <br /> Toluene 2 26 1 0 2 00 113 76-123 <br /> Surrogate Dihromoj7uoromethane 2 21 2 00 110 81-126 <br /> Surrogate 1 2-Dichloroethane-d4 2 13 2 00 106 73-131 <br /> Surrogate Toluene-d8 2 05 2 00 102 82-129 <br /> ola Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise staled results are reported on a wei weight <br /> hasts This analytical report must be reproduced in its entirety <br /> Page 20 of 25 <br />