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�l <br /> 4D 885 Jarvis Drive <br /> Sequoia Morgan Hill,CA 95037 <br /> (408)776-9600 <br /> Analytical - FAX(408)782-6308 <br /> 1 www.sequaialabs.com <br /> a <br /> r <br /> i <br /> URS Corporation[Arcot] Project:ARCO#2168,Stockton,CA MOK0609 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number.GOC81-0010 Reported: <br /> Sacramento CA,95833 Project Manager:Vemon P.Elarth 11/28/05 15:22 <br /> Volatile Organic Compounds by EPA Method 8260B -Quality Control <br /> f Sequoia Analytical-Morgan Hill <br /> I Reporting Spike Source %REC RPD <br /> [Analyte Result Limit Emits Level Result %REC Limits RPD Limit Notes <br /> Batch 5K17013-EPA 50351 EPA 8260B <br /> Blank(5K17013-BLK1) Prepared&Analyzed: 11/17/05 <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 IC <br /> Ethyl tent-bury]ether ND 0.0050 " <br /> r Ethylbenzene ND 0.0050 11 <br /> Methyl tert-butyl ether ND 0.0050 <br /> Toluene ND 0.0050 " <br /> Xylenes(total) ND 0.0050 " <br /> Gasoline Range Organics(C4-C 12) ND 0.10 " <br /> Surrogate:l,2-Dichloroethane-d4 0.00473 0.00500 95 60-125 <br /> Laboratory Control Sample(SK17013-BSI) Prepared&Analyzed: 11/17/05 <br /> Gasoline Range Organics(C4-C12) 0.540 0.10 mg/kg 0.440 123 53-126 <br /> Surrogate:l,2-Dichloroethane-d4 0.00580 0.00500 116 60-125 <br /> I` Laboratory Control Sample(5K17013-BS2) Prepared&Analyzed: 11/17/05 <br /> Cert-Amyl methyl ether 0.0103 0.0050 mg/kg 0.0100 103 80-130 <br /> Benzene 0.0101 0.0050 0.0100 101 65-125 <br /> tert-Butyl alcohol 0.0551 0.020 0.0500 110 80-165 <br /> Di-isopropyl ether 0.0102 0.0050 0.0100 102 85-115 <br /> 1,2-Dibromoethane(EDB) 0.0111 0.0050 0.0100 111 85-130 <br /> 1,2-Dichloroethane 0.0106 0.0050 0.0100 106 63-124 <br /> l Ethanol 0.338 0.10 0.200 169 35-150 1C,HL <br /> Ethyl tart-bury]ether 0.00972 0.0050 0.0100 97 80-125 <br /> Ethylbenzene 0.0110 0.0050 0.0100 110 80-135 <br /> Methyl tert-butyl ether 0.00988 0.0050 0.0100 99 75-115 <br /> 1 <br /> E Toluene 0.00944 0.0050 0.0100 94 85-125 <br /> Xylenes(total) 0.0320 0.0050 0.0300 107 80-140 <br /> Surrogate 1,2-Dichloroethane-d4 0.00492 0.00500 98 60-125 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with Jh the chain of <br /> custody document.Unless otherwise stated,results are reported an a wet weight basis. <br /> This analytical report must be reproduced in its entirety. <br /> Page 7 of 9 <br /> r <br />