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~ 1885 Jarvis Drive <br /> Sequoia Morgan Hill CA 95037 <br /> (D— (408) <br /> Analytical FAX 776-9600 <br /> (408)782 6308 i <br /> www sequoialabs com <br /> URS Corporation[Arco I] Project ARCO#6100,Tracey,CA MOF0491 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number GOC IY-000317 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 06/17/05 16 37 <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 5F15006-EPA 5030B P/T/EPA 8260B <br /> Blank(5F15006-BLK1) Prepared&Analyzed 06/15/05 <br /> tert-Amyl methyl ether ND 050 mg/ml Air LP <br /> Benzene ND 050 " <br /> tert-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tent-butyl ether ND 050 " <br /> Ethylbenzene ND 050 " <br /> Methyl cert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Gasolme Range Organics(C4 C12) ND 50 " <br /> arrogate 12-Dichloroethane-d4 431 5 00 86 60-135 <br /> aboratory Control Sample(511715006-BSI) Prepared&Analyzed 06/15/05 <br /> tert-Amyl methyi ether 109 050 mg/ml Air 100 109 80-115 <br /> Benzene 9 71 050 loo 97 65-115 <br /> tert-Butyl alcohol 531 20 500 106 75-150 <br /> Di-isopropyl ether 10 2 050 f 0 0 102 75-125 <br /> Ethyl tert-butyl ether 995 050 100 100 75-130 <br /> Ethylbenzene 936 050 100 94 75-135 <br /> Methyi tert-butyl ether 10 1 050 100 101 65-125 <br /> Toluene 960 050 100 96 85-120 <br /> Xylenes(total) 304 0 50 300 101 85-125 <br /> Surrogate 12-Dichloroethane-d4 484 500 97 60-135 <br /> Laboratory Control Sample(SF15006-BS2) Prepared&Analyzed 06/15/05 <br /> Benzene 560 050 mg/ml Air 608 92 65-115 <br /> Ethylbenzene 742 050 784 95 75-135 <br /> Methyl tert-butyl ether 831 050 960 87 65-125 <br /> Toluene 345 050 329 105 85-120 <br /> Xylenes(total) 428 050 38 5 111 85-125 <br /> Gasoline Range Organics(C4 C12) 366 50 440 83 70-124 <br /> Surrogate 12-Dichloroethane-d4 389 500 78 60-135 <br /> SequoiaAnalytical- 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 15 <br />