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Alpha Analytical Laboratories Inc. e-mail: clientservices@alpha-Iabs.cOm <br />CHEMICAL EXAMINATION REPORT Page 60 of 68 <br />URS Corp - Sac <br />2870 Gateway Oaks Dr., Suite 300 Report Date: 10/22/07 07:24 <br />Sacramento, CA 95833 Project No: 18600251.02041 <br />Attn: Chani Leimbach Project ID: DTSC FMS24 Phase 2 <br />Order Number Receipt Date/Time Client Code Client PO/Reference <br />07JO347 10/06/2007 13:00 URS -SAC <br />Volatile Organic Compounds by EPA Method 8260E - Quality Control <br />Spike Source %REC RPD <br />Analyte(s) Result PQL Units Level Result %REC Limits RPD limit Flag <br />Batch AJ71704 - VOAs in Soil GCMS <br />LCS (AJ71704-BSI <br />Prepared & Analyzed: 10/16/07 <br />Methyl ethyl ketone <br />0.0710 <br />0.015 <br />0.0500 <br />I42 <br />53-146 <br />Methyl isobutyl ketone <br />0.0540 <br />0.010 <br />0.0500 <br />108 <br />70-130 <br />Methyl tert-butyl ether <br />0.0270 <br />0.0050 <br />0.0250 <br />108 <br />75-140 <br />Methylene chloride <br />0.0263 <br />0.0050 <br />0.0250 <br />105 <br />71=128 <br />Naphthalene <br />0.0270 <br />0.0050 <br />0.0250 <br />108 <br />68-156 <br />n-Propylbenzene <br />0.0227 <br />0.0050 <br />0.0250 <br />90.8 <br />75-133 <br />Styrene <br />0.0252 <br />0.0050 <br />0.0250 <br />101 <br />76-133 <br />1,1,1,2 -Tetrachloroethane <br />0.0236 <br />0.0050 <br />0.0250 <br />94.4 <br />70-139 <br />1,1,2,2 -Tetrachloroethane <br />0.0228 <br />0.0050 <br />0.0250 <br />91.2 <br />67-122 <br />Tetrachloroethene <br />0.0230 <br />0.0050 <br />0.0250 <br />92.0 <br />74-137 <br />Toluene <br />0.0209 <br />0.0050 <br />0.0250 <br />83.6 <br />78-123 <br />1,2,3-Trichlorobenzene <br />0.0248 <br />0.0050 <br />0.0250 <br />99.2 <br />80-127 <br />1,2,4-Trichlorobenzene <br />0.0241 <br />0.0050 <br />0.0250 <br />96.4 <br />78-127 <br />1,1,1 -Trichloroethane <br />0.0244 <br />0.0050 <br />0.0250 <br />97.6 <br />78-131 <br />1,1,2 -Trichloroethane <br />0.0219 <br />0.0050 <br />0.0250 <br />87.6 <br />74-130 <br />TrichIoroethene <br />0.0241 <br />0.0050 <br />0,0250 <br />96.4 <br />81-117 <br />Trichlorofluoromethane <br />0.0222 <br />0.0050 <br />0.0250 <br />88.8 <br />66-136 <br />Trichlorotrifluoroethane <br />0.0215 <br />0.0050 n <br />0.0246 <br />87.4 <br />64-134 <br />1,2,3-Trichloropropane <br />0.0233 <br />0.0050 <br />0.0250 <br />93.2 <br />73-131 <br />1,2,4-Trimethylbenzene <br />0.0228 <br />0,0050 <br />0.0250 <br />91.2 <br />81-130 <br />1,3,5-Trimethylbenzene <br />0.0227 <br />0.0050 <br />0.0250 <br />90.8 <br />77-129 <br />Vinyl chloride <br />0.0251 <br />0,0050 <br />0.0250 <br />100 <br />65-138 <br />ra,p-Xylene <br />0.0442 <br />0.0050 <br />0.0500 <br />88.4 <br />82-127 <br />o -Xylene <br />0.02.21 <br />0,0050 <br />0,0250 <br />88.4 <br />83-125 <br />Xylenes (total) <br />0.0663 <br />0.0050 <br />0.0750 <br />88.4 <br />79-129 <br />The results in this report apply to the samples analyzed in accordance with the chain <br />ofcustody document. This analytical report must be reproduced in its entirety. -6 <br />Bruce Gove 10/22/2007 <br />Laboratory Director <br />Corporate: 208 Mason St., Ukiah, CA 95482 - Phone: (707) 468-0401 - Fax: (707) 468-5267 <br />Service Center: 6398 Dougherty Rd., Suite 3, Dublin, CA 94568 - Phone: (925) 828-6226 - Fax: (925) 828-6309 <br />