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4D (408) <br /> 8Jarvis Drive <br /> Sequoia Morgan Hi Hill,CA 95037 <br /> 776-9600 <br /> iW Analytical FAX(408)782-6308 <br /> www.sequoialabs.com <br /> URS Corporation(Arcot] Project:ARCO#0595,CA MPA0032 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number:GOBZG-0002 Reported: <br /> Sacramento CA,95833 Project Manager:Vemon 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 /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 6AO4040-EPA 5030B/5035A McOH/EPA 8260B <br /> Blank(6AO4040-BLK1) Prepared:01/04/06 Analyzed:01/06/06 <br /> tert-Amyl methyl ether ND 0.025 mg/kg <br /> Benzene ND 0.050 " <br /> tert-Butyl alcohol ND 5.0 " <br /> Di-isopropyl ether ND 0.025 " <br /> 1,2-Dibromoethane(EDB) ND 0.025 " <br /> 1,2-Dichloroethane ND 0.025 " <br /> Ethanol ND 10 IC <br /> Ethyl tert-butyl ether ND 0.025 " <br /> Ethylbenzene ND 0.050 " <br /> Methyl tert-butyl ether ND 0.025 PF <br /> Toluene ND 0.050 " <br /> Xylenes(total) ND 0.050 " <br /> Gasoline Range Organics(C4-C12) ND 2.5 " <br /> Surrogate:1,1-Dichloroethane-d4 0.00509 0.00500 102 60-115 <br /> Laboratory Control Sample(6AO4040-BSI) Prepared:01/04/06 Analyzed:01/05/06 <br /> tert-Amyl methyl ether 0.615 0.025 mg/kg 0.564 109 80-130 <br /> Benzene 0.204 0.050 0.194 105 65-125 <br /> cert-Bury]alcohol 4.76 5.0 5.37 89 80-165 <br /> Di-isopropyl ether 0.508 0.025 0.567 90 85-115 <br /> 1,2-Dibromoethane(EDB) 0.646 0.025 0.558 116 85-130 <br /> 1,2-Dichloroethane 0.586 0.025 0.552 106 63-124 <br /> Ethanol 5.53 10 5.31 104 35-150 IC <br /> Ethyl tert-butyl ether 0.629 0.025 0.564 112 80-125 <br /> Ethylbenzene 0.262 0.050 0.283 93 80-135 <br /> Methyl tert-butyl ether 0.334 0.025 0.263 127 75-115 PF,HL <br /> Toluene 1.49 0.050 1.39 107 85-125 <br /> Xylenes(total) 1.53 0.050 1.55 99 80-140 <br /> Gasoline Range Organics(C4-C12) 18.5 2.5 16.5 112 60-140 <br /> Surrogate:l,2-Dichloroethane-d4 0.00518 0.00500 104 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 9 of 13 <br />