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2.9 Radon Flux Measurements <br />The methods described herein are consistent with EPA Method 115, 40 Code of Federal <br />Regulations (C.F.R.), Part 61, National Emission Standards for Hazardous Air Pollutants: <br />Radionuclides; Final Rule and Notice of Reconsideration, December 15, 1989. RG 4.14 suggests <br />obtaining radon flux measurements at the center of operations, and at locations 750 in and 1500 <br />m from the center of operations, in four cardinal compass directions on a quarterly basis. <br />A total of three sampling events occurred for radon flux within the project site during the spring, <br />summer and fall, for a total of twenty-one samples. Measuring radon flux involves the <br />adsorption of radon on activated charcoal in a large-area collector. The radon collector is placed <br />on the surface to be measured and allowed to collect radon for a time period of 24 hours. <br />Measurement locations are shown in Plates 1 and 2. Measurement points were located in a <br />manner similar to that which is to be utilized for subsurface soil. Transfer of charcoal to and <br />from canisters (typically 25 cm in diameter PVC end cap) was performed carefully inside an <br />enclosed work area. All canisters were sealed prior to deployment and shipment via FedEx (with <br />proper chain of custody) to ELI for analysis. The radon collected on the charcoal was measured <br />by gamma-ray spectroscopy by ELI. QA/QC protocol and standard sampling procedures were <br />strictly employed. <br />2.10 Vegetation and Food Products <br />RG 4.14 suggests that vegetation be sampled three times during the growing season, and at <br />grazing areas in sectors near the site with the highest expected air particulate concentrations. <br />Vegetation samples were collected at the approximate locations shown in Plates 1 and 2. These <br />sectors are downwind from planned ISR operations, and thus would be expected to have the <br />highest predicted air particulate concentrations during proposed project operations. Vegetation <br />and food crop samples were collected three times during the growing season. Grassland <br />vegetation (grasses such as blue grama, western wheat grass, and buffalo grass) was sampled by <br />clipping above ground stems. A total of fifty-three, one kilogram samples were collected for <br />each major species and bagged for analysis. Small grain dry land crops, including the local food <br />crops wheat, and oats, were collected. Consumption of game animals and / or domesticated meat <br />sources is not expected to be a significant pathway. However, an animal sampling program was <br />conducted as described in Section 2.11. All samples were shipped in sealed bags with proper <br />chain of custody to ELI. Vegetation samples were analyzed for Uranium, Th 230, Ra 226, Po <br />210, and Pb 210. QA/QC protocol and standard sampling procedures were strictly employed. <br />April 2009 13 Site Characterization Plan