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TW_ <br />Alpha PAnalytical Laboratories Inc. <br />e-mail: <br />clientsetvices@alpha-labs.com <br />CHEMICAL EXAMINATION REPORT <br />URS Corp -Sac <br />Page 18 of 50 <br />2870 Gateway Oaks Dr., Suite 300 <br />Sacramento, CA 95833 <br />Report Date: <br />10/22/07 07:09 <br />Attn: Chani Leimbach <br />Project No: <br />o: <br />18600251.02041 <br />Project <br />DTSC FM24 Phase 2 <br />ase2 <br />Order Number Receipt Date/Tune ne Client <br />Code <br />0770352 <br />10/06/2007 13:00 <br />Client PO/Reference <br />URS <br />-SAC <br />Metals by EPA 6000/7000 Series Methods - Quality Control <br />Analyte(s)ResultSpike <br />PQL Units <br />Source °/.REC RPD <br />Level Result %REC Limits <br />RPD Limit Flag <br />Batch AJ71517 - Metals Digest <br />Matrix Spike <br />Molybdenum <br />AJ71517-MSl Source: 07JO335-01 <br />Prepared: 10/15/07 Analyzed: 10/16/07 <br />0.213 0.50 <br />0.200 ND 106 <br />Nickel <br />0.182 0.10 <br />70.130 <br />Selenium <br />0.0165 <br />0200 ND 91.0 <br />70-130 <br />Silver <br />0.0050 <br />0.186 <br />0.0200 ND 82.5 <br />25-136 <br />n <br />0.010 <br />0.200 ND 93.0 <br />70-130 <br />10 <br />Vanadium <br />Vanadium <br />02 06 0.40 <br />.200 <br />0ND 103 <br />70-130 <br />Zinc <br />0.193 0.50 <br />0200 <br />. ND 96.5 <br />70-130 <br />0.223 0.10 <br />0.200 ND 112 <br />70.130 <br />Matrix Spike <br />Antimony <br />AJ71517-MS2 Source: 07JO357-01 <br />Prepared: 10/15/07 Anal 10/16/07 <br />Arsenic <br />0.218 0.020 en811 <br />Yid <br />0.200 ND 109 <br />70-130 <br />BBarium. <br />0.0223 0.0020 <br />00200 0.0038 92.5 <br />70.130 <br />BeryOium <br />0314 0.010 <br />0.200 0.094 110 <br />70.130 <br />Cadmium <br />0.208 0.010 <br />0.200 ND 104 <br />70.130 <br />Chromium <br />0.214 0.010 <br />0.200 ND 107 <br />70-130 <br />Cobalt <br />0.206 0.050 <br />0.200 ND 103 <br />70-130 <br />Copper <br />0208 0.020 <br />0.200 ND 104 <br />70-130 <br />Lead <br />0.197 0.10 " <br />ND 98.5 <br />70.130 <br />Molybdenum <br />0,211 <br />0211 0.050 <br />0.200 ND 106 <br />70-130 <br />Nickel <br />0.220 0.50 <br />0.200 ND 110 <br />70-130 <br />Selenium <br />0.181 0.10 <br />0200 ND 90.5 <br />70.130 <br />Silver <br />0.0169 0.0050 <br />0.0200 ND 84.5 <br />25-136 <br />Thallium <br />0.190 0.010 <br />0.200 ND 95.0 <br />70.130 <br />Vanadium <br />0.213 0.40 <br />0.200 ND 106 <br />70.130 <br />Zinc <br />0.196 0.50 <br />0.200 ND 98.0 <br />70-130 <br />0.220 0.10 n <br />0.200 ND 110 <br />70-130 <br />The results m this report apply to the samples analyzed to accordance with the chain <br />of custody document. <br />This analytical report mast be reproduced in its emtret <br />, <br />13 L., <br />Bruce Gove <br />Corporate: 208 Mason St.,Ukiah, CA 95482 • <br />Phone: 6Director <br />10/22/2007 <br />Service Center: 6398 Dougherty Rd., Suite 3, Dublin, CA <br />(707) 8-0401 • <br />94568 • Phone: <br />Fax: (707) 468-5267 <br />(925) 828-6226 <br />• Fax: (925) 828-6309 <br />