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885 Jarvis Drive <br /> 4DSequoia Morgan Hill,CA 95037 <br /> (408)776-9600 <br /> mW Analytical FAX(408)782-6308 <br /> www.sequoialabs.com <br /> URS Corporation[Arcoll Project:ARCO#0595,CA MPA0137 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number:GOBZG-0002 Reported: <br /> Sacramento CA,95833 Project Manager:Vernon 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 /> Matrix Spike(6A12012-MSI) Source:MPA0137-01 Prepared&Analyzed:01/12/06 <br /> tert-Amyl methyl ether 0.0181 0.0050 mg/kg 0.0163 ND 111 80-130 <br /> Benzene 0.00602 0.0050 0.00504 0.0022 76 65-125 <br /> tert-Butyl alcohol 0.198 0.020 0.169 ND 117 80-135 <br /> Di-isopropyl ether 0.0183 0.0050 0.0162 ND 113 85-115 <br /> 1,2-Dibromoethane(EDB) 0.0164 0.0050 0.0166 ND 99 85-130 <br /> 1,2-Dichloroethane 0.0181 0.0050 0.0187 0.000070 96 63-124 <br /> Ethanol 0.175 0.10 0.165 ND 106 35-150 <br /> Ethyl tert-butyl ether 0.0178 0.0050 0.0164 0.000090 108 80-125 <br /> Ethylbenzene 0.00714 0.0050 0.00728 ND 98 80-135 <br /> Methyl cert-butyl ether 0.00849 0.0050 0.00784 ND 108 75-115 <br /> Toluene 0.0370 0.0050 0.0380 0.00030 97 85-125 <br /> Xylenes(total) 0.0426 0.0050 0.0408 ND 104 80-140 <br /> Gasoline Range Organics(C4-C12) 0.519 0.10 0.440 ND 118 53-126 <br /> Surrogate:l,1-Dichloroethane-d4 0.00505 0.00500 101 60-115 <br /> Matrix Spike Dup(6A12012-MSDI) Source:MPA0137-01 Prepared&Analyzed:01/12/06 <br /> tert-Amyl methyl ether 0.0178 0.0050 mg/kg 0.0163 ND 109 80-130 2 25 <br /> Benzene 0.00595 0.0050 0.00504 0.0022 74 65-125 1 20 <br /> tert-Butyl alcohol 0.192 0.020 0.169 ND 114 80-135 3 20 <br /> Di-isopropyl ether 0.0183 0.0050 0.0162 ND 113 85-115 0 20 <br /> 1,2-Dibromoethane(EDB) 0.0163 0.0050 0.0166 ND 98 85-130 0.6 15 <br /> 1,2-Dichloroethane 0.0176 0.0050 0.0187 0.000070 94 63-124 3 25 <br /> Ethanol 0.162 0.10 0.165 ND 98 35-150 8 40 <br /> Ethyl tert-butyl ether 0.0179 0.0050 0.0164 0.000090 109 80-125 0.6 25 <br /> Ethylbenzene 0.00735 0.0050 0.00728 ND 101 80-135 3 20 <br /> Methyl tert-butyl ether 0.00832 0.0050 0.00784 ND 106 75-115 2 35 <br /> Toluene 0.0381 0.0050 0.0380 0.00030 99 85-125 3 15 <br /> Xylenes(total) 0.0438 0.0050 0.0408 ND 107 80-140 3 20 <br /> Gasoline Range Organics(C4-C 12) 0.525 0.10 0.440 ND 119 53-126 1 25 <br /> Surrogate:1,1-Dichloroethane-d4 0.00484 0.00500 97 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 staled,results are reported on a wet weight basis. <br /> This analytical report must be reproduced in its entirety. <br /> Page 11 of 14 <br />