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Rimrock Exploration & Development, Inc. <br />J-Bird Uranium Mine/ DMO/ EPP Designated Chemical(s) Evaluations <br />5.1 ACID GENERATION POTENTIAL <br />Several of the result parameters can be used to determine the acid generation potential <br />associated with these samples: The pH of the material was found to be slightly basic with <br />values around 7.65 - 7.0. The material contains sulfur as sulfate which does not have as <br />much acid forming potential as pyritic sulfur (which was not detected). The materials <br />also contain a certain amount of buffering capacity (as measured by alkalinity, <br />bicarbonate and hardness) which would help abate any free acid. The combination of <br />these parameters indicates that the Mine deposition material would not be significant in <br />forming an acid. <br />5.2 REGULATORY THRESHOLD LIMITS <br />SPLP analysis results were compared to regulatory threshold limits that define whether a <br />material is hazardous (as per toxicity definitions) and/or mobile. Results fell below <br />hazardous threshold limits; therefore metals such as arsenic, barium, cadmium, lead, <br />mercury, selenium and silver should be of little to no concern. Further comparison of the <br />SPLP results to additional regulatory threshold information (refer to Attachment C) <br />identified radium-226 and -228 as being above thresholds protective of drinking <br />water/human health exposures. These are conservative thresholds that are not necessarily <br />applicable to the J-Bird setting. However, this information provides an indication of <br />which elements within the J-Bird deposition materials need to be managed. None of the <br />remaining detected constituents occurred above regulatory thresholds. <br />5.3 MOBILITY POTENTIAL <br />Results of the SPLP analysis also provide an indication of mobility. The results yielded <br />few detectable elements. The detected concentrations were low. Comparison of the <br />detected concentrations to regulatory thresholds yielded few exceedences. Given that <br />SPLP analysis is a potential reflection of possible worst-case leachate conditions (since <br />SPLP mimics acid-rain conditions); this indicates that the J-Bird materials have a low <br />mobility potential. <br />Activity at the mine includes underground extraction of uranium/vanadium-bearing <br />materials. There will not be any milling or processing of materials on-site. Once waste <br />rock and ore are removed from the mine; they will be managed in order to confine the <br />footprint of effects to an absolute minimum (refer to Section 6.1). Ore is not expected to <br />reside within the working pad area for any significant duration. Similarly, waste rock <br />will be routed back underground once conditions permit the placement of these materials. <br />10