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Drive <br /> 4D— (408) <br /> . n Hi Jarvis 5037Sequo><a Morgan Hi13 CA 95037Analytical FAX 776 9600 <br /> (408)782 6308 <br /> • www sequoealabs com <br /> URS Corporation[Arco I l Project ARCO#6100,Tracey,CA MOF0491 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number GOC I Y-0003/7 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 06/17/05 16 37 <br /> Purgeable Hydrocarbons and 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 Limu Notes <br /> Batch 5FI5006-EPA 5030E P/T/EPA 8260B <br /> Blank(5F15006-DLK1) Prepared&Analyzed 06/15/05 <br /> ter(-Amyl methyl ether ND 012 ppmv LP <br /> Benzene ND 016 " <br /> tert-Butyl alcohol ND 66 " <br /> Di-isopropyl ether ND 012 " <br /> Ethyl tert-butyl ether ND 0 12 " <br /> Ethylbenzene ND 012 " <br /> Methyl tert-butyl ether ND 0 14 " <br /> Toluene ND 013 " <br /> Xylenes(total) ND 0 12 " <br /> Gasoline Range Organics(C4 C12) ND 14 " <br /> rrogate 12-Dichloroethane-d4 102 119 86 60-135 <br /> aboratory Control Sample(5F15006-BS1) Prepared&Analyzed 06/15/05 <br /> tert-Amyl methyl ether 2 62 012 ppmv 240 109 80-115 <br /> Benzene 304 016 3 14 97 65-115 <br /> ten Butyl alcohol 175 6 6 165 106 75-150 <br /> Di-isopropyl ether 246 012 240 102 75-125 <br /> Ethyl tent-butyl ether 239 0 12 240 100 75-130 <br /> Ethylbenzene 2 16 0 12 231 94 75-135 <br /> Methyl tert butyl ether 282 0 14 2 78 101 65-125 <br /> Toluene 255 0 13 2 66 96 85-120 <br /> Xylenes(total) 700 0 12 692 101 85-125 <br /> Surrogate 11 Dechloroethane-d4 1 IS 119 97 60-135 <br /> Laboratory Control Sample(51715006-BS2) Prepared&Analyzed 06/15/05 <br /> Benzene 176 016 ppmv 191 92 65-115 <br /> Ethylbenzene 171 012 1 81 94 75-135 <br /> Methyl tert-bury]ether 231 0 14 267 87 65-125 <br /> Toluene 9 16 013 874 105 85-120 <br /> Xylenes(total) 989 012 888 111 85-125 <br /> Gasoline Range Organics(C4-C 12) 104 14 125 83 70-124 <br /> Surrogate 12 Dechloroethane-0 0 924 119 78 60-135 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analy_-ed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight bases <br /> This analytical report must be reproduced in its entirety <br /> Page 7 of 15 <br />