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(D- <br /> 885 Jarvis Drive <br /> Sequoia Morgan Hill,CA 95037 <br /> (408)776-9600 <br /> ► Analytical FAX(408)782-6308 <br /> www.sequoialabs.com <br /> URS Corporation[Arco II Project:ARCO#0595,CA MPA0141 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number:GOBZG-0002 Reported: <br /> Sacramento CA,95833 Project ManagerNernon P.Elarth 01/18/06 17:37 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical- Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte RCSn][ Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 6A12013-EPA 5035/EPA 8260B <br /> Blank(6A12013-BLKI) Prepared&Analyzed:01/12/06 <br /> tert-Amyl methyl ether ND 0.0050 mg/kg <br /> Benzene ND 0.0050 " <br /> tert-Butyl alcohol ND 0.020 " <br /> Di-isopropyl ether ND 0.0050 " <br /> 1,2-Dibromoethane(EDB) ND 0.0050 " <br /> 1,2-Dichloroethane ND 0.0050 " <br /> Ethanol ND 0.10 " <br /> Ethyl tert-butyl ether ND 0.0050 " <br /> I <br /> Ethylbenzene ND 0.0050 " <br /> Methyl tert-butyl ether ND 0.0050 " <br /> Toluene ND 0.0050 " <br /> Xylenes(total) ND 0.0050 " <br /> Gasoline Range Organics(C4-C12) ND 0.10 " <br /> Surrogate:1,2-Dichloroethane-d4 0.00334 0.00500 67 60-125 <br /> Laboratory Control Sample(6A12013-BS1) Prepared&Analyzed:01/12/06 <br /> tert-Amyl methyl ether 0.0150 0.0050 mg/kg 0.0163 92 80-130 <br /> Benzene 0.00513 0.0050 0.00504 102 65-125 <br /> tert-Butyl alcohol 0.136 0.020 0.169 80 80-165 <br /> Di-isopropyl ether 0.0173 0.0050 0.0162 107 85-115 <br /> 1,2-Dibromoethane(EDB) 0.0158 0.0050 0.0166 95 85-130 <br /> 1,2-Dichloroethane 0.0114 0.0050 0.0187 61 63-124 HL <br /> Ethanol 0.224 0.10 0.165 136 35-150 <br /> Ethyl tert-butyl ether 0.0169 0.0050 0.0164 103 80-125 <br /> Ethylbenzene 0.00750 0.0050 0.00728 103 80-135 <br /> Methyl tert-butyl ether 0.00679 0.0050 0.00784 87 75-115 <br /> Toluene 0.0382 0.0050 0.0380 101 85-125 <br /> Xylenes(total) 0.0389 0.0050 0.0408 95 80-140 <br /> Surrogate:1,2-Dichloroethane-d4 0.00318 0.00500 64 60-125 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document.Unless otherwise stated,results are reported on a wet weight basis. <br /> This analytical report must be reproduced in its entirety. <br /> Page 8 of I 1 <br />