2018-03-15_REVISION - M2008017 - Laserfiche WebLink

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JRT Consulting, Inc. March 15, 2018 Page 2 of 4 (slurry wall, topsoil and overburden stockpiles, plant and scale locations, buildings, typical mining section, dewatering pond, etc.). EXHIBIT D - Minina Plan (Rule 6.4.4): The fourth paragraph of Exhibit D states that setbacks of less than 200' may be used for structures with existing surface use agreements/damage waiver agreements. Please specify in detail what structures/agreements are being referred to (this information may also be provided as part of Exhibit S). DRMS notes that prior damage waiver agreements have been obtained from the City of Greeley, DCP Midstream, and Loloff Construction as provided in Exhibit S. DBMS considers that the entire proposed permit area is potentially affected area at this time. No evidence has been provided that any structure owners (other than the three listed above) inside, or within 200', of the existing or proposed permit area have been provided with damage waiver agreements. This demonstration is required by DBMS prior to acceptance of a geotechnical stability exhibit such as the one provided for the first four phases of the proposed operation (See comments for Exhibit S for further information). DRMS cannot approve the permit amendment unless/until all structure owners within and within 200' of the proposed permit area are provided with damage waiver agreements. EXHIBIT E - Reclamation Plan Rule 6.4.5: If the proposed lined reservoirs lie within the flood -plain, the operator will need to install engineered inlet/outlet structures to protect the integrity of the liner during a flood event. If pumping/water control features associated with the developed water resource will be constructed prior to release of the permit as proposed here, the permittee will be required to submit a detailed engineered design for these features either as part of this amendment or through a Technical Revision prior to construction. Cost for construction of these features will need to be included in the reclamation bond. These requirements also apply to the required engineered flood control structures, and installation of a perimeter drain/French drain to control groundwater levels around areas enclosed by the proposed slurry walls. Please acknowledge. EXHIBIT G - Water Information (Rule 6.4.7): Due to the potential impacts to the surrounding groundwater table from the proposed operation, a groundwater monitoring plan will be required to be submitted to DRMS and approved prior to exposure of groundwater at the site. Additional monitoring well locations will likely be required to monitor for potential off-site impacts to groundwater levels resulting from the proposed site activities. The required groundwater monitoring plan shall include, at a minimum: 1) Map depicting the locations of all current and proposed groundwater monitoring Iocations associated with this site. 2) Boring logs/well construction diagrams for all current groundwater monitoring wells associated with this site and future wells after installation. 3) Monitoring data collection and reporting methods and frequency. 4) Summary of any existing data available from current monitoring well locations and any nearby accessible monitoring or domestic wells that will help characterize the background conditions, historic water levels and seasonal fluctuations, and groundwater flow direction in the vicinity of the site. 5) Proposed "trigger levels" for each well that will identify when groundwater impacts (rise or fall) have reached levels that will require reporting to DRMS, and may require additional monitoring or mitigation actions. 6) Proposed mitigation actions that may be implemented if impacts to groundwater are observed consistently above trigger levels, or off-site impacts are observed. 7) The permittee will also be required to demonstrate that they are in compliance with the requirements of