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t <br />Alpha Analytical Laboratories Inc. e-mail: clientservices®alpha-labs.com <br />CHEMICAL EXAM NATION REPORT Page 21 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 />0710347 10/06/2007 13:00 URS -SAC <br />Metals by EPA 6000/7000 Series Methods - Quality Control <br />Analyte(s) <br />Result <br />PQL <br />Spike Source %REC RPD <br />Units Level Result %REI Limits RPD limit Flag <br />Batch AJ71517 - Metals Digest <br />Antimony <br />0.214 <br />0.020 <br />Blank (AJ71517-BLKI) <br />- <br />0.200 <br />107 <br />Prepared: 10/15/07 Analyzed: 10/16/07 <br />Silver <br />ND <br />0,010 <br />Thallium <br />ND <br />0.40 <br />" <br />Vanadium <br />ND <br />0.50 <br />" <br />Zinc <br />ND <br />0.10 <br />" <br />LCS (AJ71517-BSI) <br />Prepared: 10/15/07 Analyzed: 10/17/07 <br />Antimony <br />0.214 <br />0.020 <br />mg/l <br />0.200 <br />107 <br />85-115 <br />Arsenic <br />0.0192 <br />0.0020 <br />0.0200 <br />96.0 <br />85-115 <br />Barium <br />0.233 <br />0.0I0 <br />0.200 <br />116 <br />87-124 <br />Beryllium <br />0.216 <br />0.010 <br />0.200 <br />108 <br />85-115 <br />Cadmium <br />0.224 <br />0,010 <br />0.200 <br />112 <br />85-115 <br />Chromium <br />0.214 <br />0.050 <br />0.200 <br />107 <br />85-115 <br />Cobalt <br />0.216 <br />0.020 <br />0.200 <br />108 <br />85-115 <br />Copper <br />0.201 <br />0.10 <br />0.200 <br />100 <br />85-115 <br />Lead <br />0.219 <br />0.050 <br />0.200 <br />110 <br />85-115 <br />Molybdenum <br />0.228 <br />0.50 <br />0.200 <br />114 <br />85-115 <br />Nickel <br />0.187 <br />0.10 <br />0.200 <br />93.5 <br />85-115 <br />Selenium <br />0.0175 <br />0.0050 <br />0.0200 <br />87.5 <br />70-118 <br />Silver <br />0.186 <br />0.010 <br />0.200 <br />93.0 <br />85-115 <br />Thallium <br />0.213 <br />0.40 <br />0.200 <br />106 <br />85-115 <br />Vanadium <br />0.206 <br />0.50 <br />0.200 <br />103 <br />85-115 <br />Zinc <br />0.225 <br />0.10 <br />0.200 <br />112 <br />85-115 <br />Duplicate (AJ71517-DUPI) <br />Source: 07JO335-01 <br />Prepared: 10/15/07 <br />Analyzed: 10/16/07 <br />Antimony <br />ND <br />0.020 <br />mg/l <br />ND <br />20 <br />Arsenic <br />ND <br />0.0020 <br />ND <br />20 <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 />