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."'�_ 8Jarvis Drive <br /> Sequoia Morgan Hill,CA 95037 <br /> (408)776-9600 <br /> iW Analytical FAX(408)782-6308 <br /> www.sequoialabs.com <br /> URS Corporation[Arco I] Project:ARCO#0595,CA MPA0032 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number:GOBZG-0002 Reported: <br /> Sacramento CA,95833 Project Manager:Vernon P.Elarth 01/06/06 11:40 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> �naltitc Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 6AO4046-EPA 5030B P/T/EPA 8260B <br /> Laboratory Control Sample(6AO4046-BSI) Prepared&Analyzed:01/04/06 <br /> tert-Amyl methyl ether 0.0166 0.0050 mg/kg 0.0150 111 80-130 <br /> Benzene 0.00618 0.0050 0.00516 120 65-125 <br /> tert-Butyl alcohol 0.177 0.020 0.143 124 80-165 <br /> Di-isopropyl ether 0.0184 0.0050 0.0151 122 85-115 HL <br /> 1,2-Dibromoethane(EDB) 0.0178 0.0050 0.0149 119 85-130 <br /> 1,2-Dichloroethane 0.0184 0.0050 0.0147 125 63-124 HL <br /> Ethanol 0.335 0.10 0.142 236 35-150 HL,IC <br /> Ethyl tert-butyl ether 0.0167 0.0050 0.0150 111 80-125 <br /> Ethylbenzene 0.00844 0.0050 0.00754 112 80-135 <br /> Methyl tert-butyl ether 0.00813 0.0050 0.00702 116 75-115 HL <br /> Toluene 0.0456 0.0050 0.0372 123 85-125 <br /> Xylenes(total) 0.0498 0.0050 0.0412 121 80-140 <br /> Gasoline Range Organics(C4-C12) 0.664 0.10 0.440 151 53-126 HL <br /> Surrogate:1,2-Dichloroethane-d4 0.00472 0.00500 94 60-125 <br /> Matrix Spike(6A04046-MS1) Source:MPA0032-01 Prepared&Analyzed:01/04/06 <br /> tert-Amyl methyl ether 0.0162 0.0050 mg/kg 0.0150 0.00018 107 80-130 <br /> Benzene 0.00552 0.0050 0.00516 ND 107 65-125 <br /> tert-Butyl alcohol 0.176 0.020 0.143 0.0024 121 80-135 <br /> Di-isopropyl ether 0.0187 0.0050 0.0151 ND 124 85-115 HL <br /> 1,2-Dibromoethane(EDB) 0.0174 0.0050 0.0149 ND 117 85-130 <br /> 1,2-Dichloroethane 0.0169 0.0050 0.0147 ND 115 63-124 <br /> Ethanol 0.255 0.10 0.142 ND 180 35-150 HL,IC <br /> Ethyl tert-butyl ether 0.0176 0.0050 0.0150 ND 117 80-125 <br /> Ethylbenzene 0.00735 0.0050 0.00754 ND 97 80-135 <br /> Methyl tert-butyl ether 0.00762 0.0050 0.00702 ND 109 75-115 <br /> Toluene 0.0355 0.0050 0.0372 ND 95 85-125 <br /> Xylenes(total) 0.0440 0.0050 0.0412 ND 107 80-140 <br /> Gasoline Range Organics(C4-C12) 0.546 0.10 0.440 ND 124 53-126 <br /> Surrogate:1,2-Dichloroethane-d4 0.00443 0.00500 89 60-115 <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 11 of 13 <br />