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85 <br /> Sequoia n Hill A 5037 <br /> Drive <br /> Morgan Hill CA 95037 <br /> � - Analytical FAX(408(408)706 <br /> 78822 6 63308 <br /> www sequotalabs cum <br /> URS Corporation[Arcot] Project ARCO#6100 Tracey,CA MOH0072 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number GOC IY-0005 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 08/05/05 10 25 <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 Resull Limit Umts Level Result %REC Limits RPD Limit Notes <br /> Batch 5HO3004-EPA 5030B P/T/EPA 8260B <br /> Blank(51i03004-BLKI) Prepared&Analyzed 08/03/05 <br /> tent-Amyl methyl ether ND 0 12 ppmv <br /> Benzene ND 016 <br /> tert-Butyl alcohol ND 6 6 <br /> Di-isopropyl ether ND 0 12 " <br /> Ethyl tert butyl ether ND 0 12 " <br /> Ethylbenzene ND 012 " <br /> Methyl tent-butyl ether ND 0 14 " <br /> Toluene ND 013 " <br /> Xylenes(total) ND 0 12 " <br /> Gasoline Range Organics(C4-C12) ND 14 " <br /> Surrogate 12-Dichloroethane-d4 0 620 0 594 104 60-135 <br /> aboratory Control Sample(5HO3004-BSI) Prepared&Analyzed 08/03/05 <br /> rt-Amyl methyl ether <br /> 249 0 12 ppmv 240 104 80-115 <br /> Benzene 3 32 016 3 14 106 65-115 <br /> tert-Butyl alcohol 15 9 6 6 165 96 75-150 <br /> Di-isopropyl ether 230 0 12 240 96 75-125 <br /> Ethyl tert butyl ether 239 0 12 240 99 75-130 <br /> Ethylbenzene 207 0 12 231 90 75-135 <br /> Methyl tert-butyl ether 299 0 14 278 108 65-125 <br /> Toluene 286 0 13 266 108 85-120 <br /> Xylenes(total) 6 14 012 6 92 89 85-125 <br /> Surrogate 12-Drchlaroethane-d4 0 577 0 594 97 60-135 <br /> Laboratory Control Sample(5H03004-BS2) Prepared&Analyzed 08/03/05 <br /> $enzene 181 016 ppmv 191 95 65-115 <br /> Ethylbenzene 161 0 12 1 81 89 75-135 <br /> Methyl tert-butyl ether 247 0 14 267 93 65-125 <br /> Toluene 973 013 874 ill 85-120 <br /> Xylenes(total) 788 0 12 8 88 89 85-125 <br /> Gasoline Range Organics(C4-C 12) 129 14 125 103 70-124 <br /> Surrogate 1 2-Dichloroelhane-d4 0 560 0 594 94 60-135 <br /> Sequoia Analytical -Morgan Hill <br /> g The results to this repw 1 apply to the samples analysed in accordance with the charas 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 11 <br />