2010-06-23_REVISION - P2008043 (3)

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A. Sorenson, DRMS NOI Mod #4 June 23, 2010 Page Two It is not Powertech's intention to replace NOI P-2008-043 MD-03 with this modification. Powertech still intends on utilizing NOI P-2008-043 MD-03. However the disposal of pump test produced waters as outlined in NOI P-2008-043 MD-03 is contingent upon the issuance of the EPA Class V UIC Permit. EPA issued a statement that it expected the permit to be granted in mid-April, 2010. The permit has not yet been granted, and the applicant is now moving forward with an alternative water disposal methodology. The applicant's intent with this modification is to propose a second and alternative form of water disposal. The aquifer pump test will be conducted and analyzed in the same way as explained in the NOI P-2008-043 MD-03, and the design criteria and flow rates remain the same. The only difference contained in this modification from that in the NOI P-2008-043 MD-03 is the storage, monitoring, sampling, and disposal of aquifer pumping test-generated water. Utilizing this proposed alternative form of aquifer pumping test water disposal will involve no surface disturbance that will require reclamation. However, it is recognized that DRMS may elect to require bonding for the removal of piping, trailer mounted electrical generators, and trailer mounted camper. All equipment with the exception of piping will be on wheels. Piping will be laid on the ground surface and immediately removed following the pump test, which is expected to last no longer than 2 weeks. All other required equipment will also be removed from the site immediately following the pump test. The location of discharged water will be continuously monitored throughout the duration of the pump test to ensure no erosion takes place that is in excess of that natural to the stream tributary. If excessive erosion within the stream tributary begins to take place, discharge will immediately cease. Aquifer pumping test-generated waters will be disposed of in full accordance to Federal and State laws, and will conform to rule 3.1.6 of the Mineral Rules and Regulations of the Colorado Mined Land Reclamation Board for Hard Rock, Metal, and Designated Mining Operations. If you have any questions or require additional information, please feel free to contact Michael Beshore at (970)556-5988 or me at (303) 790-7528. Sincerely Yours, 124?z_ Richard E. Blubaugh Vice President-Environmental Health & Safety Resources Enclosures cc: T. Walsh M. Beshore A. Thurlkill