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a <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]] Project:ARCO#0595,CA MPA0137 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number:GOBZG-0002 Reported: <br /> Sacramento CA,95833 Project ManagerNernon P.Elarth 01/20/06 10:54 <br /> Volatile Organic Compounds by EPA Method 8260B-Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 6A12012-EPA 5030B P/T/EPA 8260B <br /> Blank(6A12012-BLK1) 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 /> 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 0.00522 0.00500 104 60-125 <br /> Laboratory Control Sample(6A12012-BS2) Prepared&Analyzed:01/12/06 <br /> tert-Amyl methyl ether 0.0181 0.0050 mg/kg 0.0163 111 80-130 <br /> Benzene 0.00593 0.0050 0.00504 118 65-125 <br /> tert-Butyl alcohol 0.180 0.020 0.169 107 80-165 <br /> Di-isopropyl ether 0.0180 0.0050 0.0162 111 85-115 <br /> 1,2-Dibromoethane(EDB) 0.0169 0.0050 0.0166 102 85-130 <br /> 1,2-Dichloroethane 0.0181 0.0050 0.0187 97 63-124 <br /> Ethanol 0.178 0.10 0.165 108 35-150 <br /> Ethyl tert-butyl ether 0.0176 0.0050 0.0164 107 80-125 <br /> Ethylbenzene 0.00701 0.0050 0.00728 96 80-135 <br /> Methyl tert-butyl ether 0.00852 0.0050 0.00784 109 75-115 <br /> Toluene 0.0366 0.0050 0.0380 96 85-125 <br /> Xylenes(total) 0.0416 0.0050 0.0408 102 80-140 <br /> Gasoline Range Organics(C4-C12) 0.552 0.10 0.440 125 53-126 <br /> Surrogate:1,2-Dichloroethane-d4 0.00499 0.00500 100 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 10 of 14 <br />