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� 885 Jarvis Drive <br /> Sequoia Morgan Hill,CA 95037 <br /> a— (408)776-9600 <br /> Analytical FAX(408)782-6308 <br /> www.sequoialabs.com <br /> URS Corporation[ArcoI I Project:ARCO#0595,CA MPA0033 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number:GOBZG-0002 Reported: <br /> Sacramento CA,95833 Project ManagerNemon P.Elarth 01/06/06 15:57 <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 503OB/5035A McOH/EPA 8260B <br /> Laboratory Control Sample Dup(6AO4040-BSDI) Prepared:01/04/06 Analyzed:01/05/06 _ <br /> tert-Amyl methyl ether 0.628 0.025 mg/kg 0.564 111 80-130 2 25 <br /> Benzene 0.199 0.050 0.194 103 65-125 2 20 <br /> Cert-Butyl alcohol 4.71 5.0 5.37 88 80-165 1 25 <br /> Di-isopropyl ether 0.512 0.025 0.567 90 85-115 0.8 20 <br /> 1,2-Dibromoethane(EDB) 0.599 0.025 0.558 107 85-130 8 15 <br /> 1,2-Dichloroethane 0.576 0.025 0.552 104 63-124 2 25 <br /> Ethanol 5.12 10 5.31 96 35-150 8 40 1C <br /> Ethyl tert-butyl ether 0.621 0.025 0.564 110 80-125 1 25 <br /> Ethylbenzene 0.263 0.050 0.283 93 80-135 0.4 20 <br /> Methyl tert-butyl ether 0.341 0.025 0.263 130 75-115 2 35 PF,HL <br /> Toluene 1.48 0.050 1.39 106 85-125 0.7 15 <br /> Xylenes(total) 1.55 0.050 1.55 100 80-140 1 20 <br /> Gasoline Range Organics(C4-C12) 17.9 2.5 16.5 108 60-140 3 25 <br /> Surrogate:1,2-Dichloroethane-d4 0.00501 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 7 of 8 <br />