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analyzed. Air particulate samples were analyzed for Uranium4, Thorium (Th) 230, Radon <br />(Ra) 226, and Polonium (Po) 210. <br />2.4.4 Radon in Air <br />Radon samples were collected continuously at each of the five high volume air monitoring <br />station utilizing alpha track detectors with CR 39 (allyl diglycol carbonate) substrate designed <br />for outdoor extended use. The instruments utilized included a Landaur Radtrak Long Term <br />Radon Monitor obtained from Landaur, Inc., Glenwood, Illinois (Landaur). Detectors were <br />exchanged and analyzed on a quarterly basis by Landaur. Sensitivities are typically in the 20- 40 <br />pCi/l/day range. Assuming a quarterly (90-day) exposure period, sensitivities are expected to be <br />less than 0.2-0.4 pCi/1 in air. <br />2.5 Surface Soils <br />RG 4.14 assumes a centralized continuous site. ISR activities proposed at the site will occur <br />within and over the ore bodies, which are generally long, narrow, and discontinuous. In, addition, <br />ISR "mining" takes place below-grade and, therefore, no radionuclide particulates are generated <br />under routine operations. Thus, the only potential releases from these mining activities would be <br />liquids from leaks and spills, and potentially radon gas5. The sampling location requirements <br />were adjusted to reflect the inherent difference between conventional mining/milling operations <br />and ISR. <br />As an alternative to the RG 4.14 approach-and mindful of the fact that there has not been <br />historical uranium mining at or near the site-the sampling was performed in phases and utilized <br />geostatistical analysis techniques to estimate the confidence of initial sampling locations and <br />results, and thus guide subsequent sampling phases, if they were necessary. The geostatistical <br />analysis utilized was the Krieg_2D module within C Tech Development Corp's MVS© spatial <br />analysis and visualization software package. The resulting sampling locations are shown in <br />Plates 1 and 2. <br />Surface soil samples were field-located using a hand-held Global Position System (GPS) unit. A <br />soil sample was obtained at each location from the top fifteen centimeters or at the bedrock <br />surface, whichever was shallower and collected once for analysis. The samples were shipped in <br />glass or plastic containers within an ice chest with packing materials to guard against breakage. <br />Samples were shipped via overnight carrier with proper chain of custody to ELI for analysis. <br />4 Uranium means "natural Uranium" i.e., combination of Uranium isotopes in mass percent as occurs in <br />nature: U238 (99.3), U 235 (0.72) and U 234 (0.005). <br />5 Radon gas emissions, if any, will be continuously monitored during operations at the air monitoring <br />stations. <br />April 2009 10 Site Characterization Plan