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i <br /> •i <br /> l Blvd North Ste <br /> Sequoia 1455 McDowPetaluma CA 49504 <br /> a— ) (707)792 1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs corn <br /> i <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 4020616-EPA 5030 soils <br /> Blank(4020616-BLKI) Prepared&Analyzed 02/27/04 <br /> Tert-amyl methyl ether ND 00050 mg/kg _..._.. <br /> Benzene ND 00020 " <br /> Tert-butyl alcohol ND 0 10 " <br /> Di-isopropyl ether ND 00050 " <br /> 1 2-Dtbromoethane(EDB) ND 00050 " <br /> 1,2-Dtchloroethane ND 00050 " <br /> Ethanol ND 0 20 " <br /> Ethylbenzene ND 00050 <br /> Ethyl cert-butyl ether ND 00050 " <br /> Methyl tert-butyl ether ND 00050 " <br /> Toluene ND 00050 " <br /> lenes(total) ND 00050 " <br /> agate Dibromofluoromethane 00417 00380 110 81-126 <br /> Surrogate 1 2-Dtchloroethane-d4 00407 00380 107 73-131 <br /> Surrogate Toluene-d8 0 0367 00380 97 82-129 <br /> Laboratory Control Sample(4020616-BS1) Prepared&Analyzed 02/27/04 <br /> Tert-amyl methyl ether 0 0557 00050 mg/kg 00500 111 74-126 <br /> Benzene 0 0561 00050 00500 112 75-123 <br /> Tert-butyl alcohol 0 969 0 10 1 00 97 66-129 <br /> Do-isopropyl ether 0 0611 00050 00500 122 71-127 <br /> 1,2-Dtbromoethane(EDB) 0 0508 00050 0 0500 102 88-118 <br /> 1 2-Dtchloroethane 00547 00050 0 0500 109 79-119 <br /> Ethanol 0 996 0 20 1 00 100 70-140 <br /> Ethylbenzene 00568 00050 0 0500 114 65-135 <br /> Ethyl tert-butyl ether 0 0539 00050 0 0500 108 72-123 <br /> Methyl tert-butyl ether 0 0565 00050 00500 113 70-125 <br /> Toluene 0 0487 00050 00500 97 76-123 <br /> Surrogate Dibromgfluoromethane 00414 00380 109 81-126 <br /> Surrogate 1 2-Dtchloroethane-d4 00401 00380 106 73-131 <br /> Surrogate Toluene-d8 00387 00380 102 82-129 <br /> nota 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 /> basis This analytical report must be reproduced in its entirety <br /> Page 18 of 25 <br />