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Alpha VAnalytical Laboratories Inc. <br />e-mail: clientservices@alpha-labs.com <br />CHEMICAL EXAMWATION REPORT <br />URS Corp - Sac Pale 22 of 50 <br />2870 Gateway Oaks Dr., Suite 300 Report Date: 10/22/07 07:09 <br />Sacramento, CA 95833 Project No: 18600251.02041 <br />Attn: Chani Leimbach Project o: DTSC FM24 Phase 2 <br />Order Number ReceiptDatell'irne Client Code <br />0770352 Client PO/Reference <br />10/06/2007 13:00 URS -SAC <br />Metals by EPA 6000/70 A Series Methods - Quality Control <br />Analyte(s) Result Spike Source °/"REC RPD <br />PQL Units Level Result "/uRBC Limits RpD Limit Flag <br />Batch AJ71541 - EPA 3051 Microwave <br />Source: <br />10 11 20.0 87 <br />10/18/07 <br />70.130 <br />Beryllium 20.0 0.75 20.0 QM -4X <br />Cadmium ND 98. 70-130 <br />18.1 1.0 20.0 ND 90.55 70-130 <br />Chromium 50.2 5.0 20.0 24 131 70-130 <br />Cobalt 35.7 10 1. QM -04 <br />20.0 14 108 70.130 <br />Copp _ 74.3 10 20.0 21 266 70-130 <br />Lead 28.6 5.0QM-04 <br />20.0 6.6 110 70.130 <br />Molybdenum 78.2 10 " <br />20.0 ND 91.0 70.130 <br />Nickel 41.4 10 " <br />20.0 18 117 70-130 <br />Selenium 0.952 1.0 " <br />2.00 ND 28.6 I5-115 <br />Silver 16.6 5.0 " <br />20.0 ND 83.0 70-130 <br />VanThallium 16.7 7.0 " <br />20.0 ND 83.5 70-130 <br />Zinc um 10 20.0 65 270 70.130 <br />Zinc 96..44 1 10 ^ QM -04 <br />20.0 60 182 70.130 QM -04 <br />Matrix Spike AJ71541-MS2 Source: 07JO347-02 Prepared: 10/15/07 Analyzed: 10/18/07 <br />Antimony 14.3 <br />Arsenic 15 m7Jkg 20.0 ND 71.5 70.130 <br />5.01 2.0 2.00 3.2 90.5 70-130 <br />Barium 89.8 10 20.0 66 119 70.130 <br />Beryllium 19.5 0.75 20.0 ND 95.4 70-130 <br />Cadmium 16.8 1.0 " <br />20.0 ND 84.0 70-130 <br />Chromium 63.9 <br />5.0 20.0 43 104 70.130 <br />Cobalt 34.2 10 " <br />20.0 13 106 70-130 <br />. <br />Copper 52.5 10 200 27 128 70.130 <br />Lead 29.7 5.0 20.0 10 98.5 70.130 <br />The results in this report apply to the samples analyzed in accordance wtth the chain <br />Of cusrOdY dOMInent. This analytical report must be reproduced in its entirety. <br />1 / (N -zee_. d- �-•-�-'� <br />Bruce Gove <br />LaboratCorporate: 208 Mason St., Ukiah, CA 95482 • Phone: (707) Director68-0401 • Fax: (707) 468-5267 10/22/2007 <br />Service Center: 6398 Dougherty Rd., Suite 3, Dublin, CA 94568 • Phone: (925) 828-6226 • Fax: (925) 828-6309 <br />