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r, <br />Weaver Engineering Services <br />2121 Comanche RD - Pueblo, Colorado 81001 - 719 - 429 -5510 <br />March 19, 2015 <br />Energy Fuels Coal, Inc. <br />PO Box 459 <br />Florence, CO 81226 <br />Atha: George Patterson, Mine Manager <br />RE: Technical Revision No. 43 (TR43) Adequacy Review Response <br />George, <br />This letter report and attachments presents a response to specific adequacy comments contained in the <br />DRMS Technical Revision No. 43 Adequacy Review (Adequacy Review) letter dated February 12, <br />2015. <br />Specifically, this letter addresses that part of the Adequacy Review requesting EFCI to provide an <br />analysis of the impacts to the quantity and quality of surface water and groundwater, and said analysis <br />should show that onsite impacts have been minimized and offsite impacts prevented. In addition, this <br />letter provides an assessment of the available hydrologic data relative to the impact projections <br />contained within the approved Probable Hydrologic Consequences (PHC). <br />This letter intends to provide an analysis of hydrologic impacts by addressing specific items contained <br />in the Adequacy Review, as follows: <br />• Analysis of the impact of the Southfield Mine on groundwater quality by plotting selected <br />individual water quality parameters against time for identification of any trends that may exist in <br />the data utilizing all available quality data collected at all current groundwater monitoring points <br />• Provide the full data set of surface water flow measurements for the three currently monitored <br />creeks. <br />• Plot all available flow data against time for identification of any long term trends that may exist in <br />surface water flows for the three creeks. <br />• Analysis of all available s<rhm water quality data by plotting representative individual water <br />quality parameters through time and identification of any tends that may exist in the data <br />• Assessment of the available hydrologic data relative to the impact projections contained within the <br />approved Probable Hydrologic Consequences (PHC). <br />Discussion <br />1 !=act of mining on groundwater quality based on P,12WU selected parameters UnW9 time from <br />all available quality data collected at current groundwater monitoring'. points <br />EFCI currently monitors four groundwater wells, MW16, MW23, MW65, and MWNW. The approved <br />list of chemical parameters for analysis includes pH (lab), Conductivity at 25C, Temperature (field), <br />Solids, total dissolved (TDS), Bicarbonate as CaCO3, Calcium, dissolved, Chloride, Magnesium, <br />dissolved, Nitrogen - ammonia, Nitrogen - nitrate nitrite, Phosphorus, ortho, Sodium, dissolved, Sulfate, <br />Iron, dissolved, and Manganese, dissolved. <br />