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Alpha VAnalytical Laboratories Inc. e-mail: clientsenAces@alpha-labs.com <br />CHEMICAL EXAMINATION REPORT Page 61 of 68 <br />URS Corp - Sac <br />2870 Gateway Oaks Dr., Suite 300 <br />Sacramento, CA 95833 <br />Attn: Chani Leimbach <br />Order Number Receipt Date/Time Client Code <br />07JO347 10/06/2007 13:00 URS -SAC <br />Report Date: 10/22/07 07:24 <br />Project No: 18600251.02041 <br />Project ID: DTSC PMS24 Phase 2 <br />Client PO/Reference <br />Volatile Organic Compounds by EPA Method 8260B - 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 (AJ'71704-BSI) <br />Prepared & Analyzed: 10/16/07 <br />Surrogate: Bromofluorobenzene <br />0.0228 <br />0.0250 <br />91.2 <br />69-134 <br />Surrogate: Dibromofluoromethane. <br />0.0221 <br />0.0250 <br />88.4 <br />63-124 <br />Surrogate: Toluene -d8 <br />0.0231 <br />0.0250 <br />92.4 <br />66-135 <br />Matrix Spike (AJ71704-MS1) <br />Source: 07J0507-01 <br />Prepared & Analyzed: 10/16/07 <br />Acetone <br />0.207 <br />0.020 mg/kg <br />0.0909 <br />0.090 <br />129 <br />0-181 <br />Benzene <br />0.0173 <br />0.0050 <br />0.0231 <br />ND <br />74.9 <br />29-145 <br />Bromobenzene <br />0.0124 <br />0.0050 <br />0.0231 <br />ND <br />53.7 <br />31-I44 <br />Bromochioromethane <br />0.0171 <br />0.0050 <br />0.0231 <br />ND <br />74.0 <br />58-129 <br />Bromodichloromethane <br />0.0179 <br />0.0050 <br />0.0231 <br />ND <br />77.5 <br />34-160 <br />Bromofonn <br />0.0134 <br />0.0050 <br />0.0231 <br />ND <br />58.0 <br />22-166 <br />Bromomethane <br />0.0176 <br />0.0050 <br />0.0231 <br />ND <br />76.2 <br />10-153 <br />n-Butylbenzene <br />0.0156 <br />0.0050 <br />0.0231 <br />ND <br />67.5 <br />0-182 <br />sec-Butylbenzene <br />0.0140 <br />0.0050 n <br />0.0231 <br />ND <br />60.6 <br />0-187 <br />tert-Butylbenzene <br />0.0152 <br />0.0050 <br />0.0231 <br />ND <br />65.8 <br />0-179 <br />Carbon tetrachloride <br />0.0176 <br />0.0050 <br />0.0231 <br />ND <br />76.2 <br />10-189 <br />Chlorobenzene <br />0.0134 <br />0.0050 <br />0.0231 <br />ND <br />58.0 <br />32-139 <br />Chloroethane <br />0.0193 <br />0.0050 " <br />0.0231 <br />ND <br />83.5 <br />46-141 <br />Chloroform <br />0.0194 <br />0.0050 <br />0.0231 <br />ND <br />70.6 <br />57-127 <br />Chloromethane <br />0.0217 <br />0.0050 <br />0.0231 <br />ND <br />93.9 <br />30-175 <br />2-Chlorotoluene <br />0.0132 <br />0.0050 <br />0.0231 <br />ND <br />57.1 <br />16-158 <br />4-Chlorotoluene. <br />0.0119 <br />0.0050 <br />0.0231 <br />ND <br />51.5 <br />13-155 <br />Dibromochloromethane <br />0.0159 <br />0.0050 " <br />0.0231 <br />ND <br />68.8 <br />34-160 <br />1,2-1)ibromo-3-chloropropane <br />0.0168 <br />0.0050 <br />0.0231 <br />ND <br />72.7 <br />24-153 <br />1,2-Dibromoethane (EDB) <br />0.0141 <br />0.0050 <br />0.0231 <br />ND <br />61.0 <br />52-129 <br />The results in this report apply to the samples analyzed in accordance with the chain <br />of custody document. This analytical report must be reproduced in its entirety. <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 />