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(D— 8Jarvis Drive <br /> Sequoia Morgan Hill,CA 95037 <br /> Analytical (408)776-9600 <br /> i%WFAX equoi labs.c 08 <br /> www.sequoialabs.com <br /> URS Corporation[ArcolI Project:ARCO#0595,CA MPA0137 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number:GOBZG-0002 Reported: <br /> Sacramento CA,95833 Project ManagerNernon 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 6A12019-EPA 5030B/5035A McOH/EPA 8260B <br /> Laboratory Control Sample Dup(6A 1 2019-BSD1) Prepared&Analyzed:01/12/06 <br /> tert-Amyl methyl ether 0.399 0.025 mg/kg 0.564 71 80-130 10 25 HM,PF <br /> Benzene 0.162 0.050 0.194 84 65-125 12 20 <br /> tert-Butyl alcohol 4.73 5.0 5.37 88 80-165 0.4 25 PE <br /> Di-isopropyl ether 0.379 0.025 0.567 67 85-115 11 20 HM,PF <br /> 1,2-Dibromoethane(EDB) 0.528 0.025 0.558 95 85-130 13 15 <br /> 1,2-Dichloroethane 0.461 0.025 0.552 84 63-124 9 25 <br /> Ethanol 6.54 10 5.31 123 35-150 9 40 IC <br /> Ethyl tert-butyl ether 0.441 0.025 0.564 78 80-125 10 25 HM <br /> Ethylbenzene 0.244 0.050 0.283 86 80-135 9 20 <br /> Methyl tert-butyl ether 0.224 0.025 0.263 85 75-115 14 35 PF <br /> Toluene 1.26 0.050 1.39 91 85-125 11 15 <br /> Xylenes(total) 1.42 0.050 1.55 92 80-140 10 20 <br /> Gasoline Range Organics(C4-C 12) 14.8 2.5 16.5 90 60-140 8 25 <br /> Surrogate:1,1-Dichloroethane-d4 0.00485 0.00500 97 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 13 of 14 <br />