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Ms. Cynthia Parker <br />Mitigation Possibilities <br />July 13, 2001 <br />Page 7 <br />There is a wide variety of actions which could be taken to avoid or mitigate the adverse <br />impacts identified above. We have not investigated the technical or economic feasibility <br />of these suggestions, but we are aware that they have been implemented in various <br />locations for various purposes. Some examples aze identified below, but this list should <br />not be understood to be either comprehensive or complete - there are certainly many <br />other possibilities which aze not mentioned here. <br />• One option which should be evaluated carefully would be the possibility of changing <br />from the "dry mining" process specified in the application to a "wet mining" process. <br />This would avoid the need for significant and long term dewatering activities, such <br />that many of the impacts described above could be avoided altogether. <br />• Consideration should be given to carrying out the mining activities over a shorter <br />duration, requiring a shorter period of dewatering activities as well (if the "dry mining <br />process" is to be used.) The application indicates that the mining activities may take <br />place over a period of 20 years or longer. This appears to us to be a relatively slow <br />rate of exploitation of the resource. <br />• Other options include construction of subsurface water barriers (e.g. slurry <br />trench/walls, etc) around the azeas to be dewatered, and/or aquifer recharge facilities. <br />These would be designed to maintain existing groundwater conditions in azeas of <br />concern. <br />We hope that you find these comments to be useful. Please do not hesitate to contact us <br />if there is any way in which we can be of assistance to you. <br />Sincerely, <br />Hydrosphere Resource Consultants, Inc. <br />by: <br />Jo H. Gerstle <br />Attachments: Figure 1 <br />Figure 2 <br />Figure 3 <br />cc: Ms. Lori Potter, Esq. <br />Dr. David Cooper <br />Hydrosphere Resource Consultants, 1002 Walnut Suite 200, Boulder, CO 80302 <br />DacumenQ CIU3ATEO July 12, 2001 12:08 PM, PRIMED. July 13, 2001 00.52 PM <br />