2018-06-11_PERMIT FILE - M2008017 (11)

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Mr. Scott Response to Preliminary Review of a 112 Construction Materials Reclamation Permit Amendment Package, Derr Pit, Permit M2008-017 Page 5 1) Costs associated with design and installation of pumping/water management structures, engineered flood control structures for lined reservoirs within the flood plain, and perimeter drains as stated in the comments for Exhibit E. 2) DRMS will not bond for the final slurry wall configuration in "phases". The required bond for the construction of the final slurry wall configuration will be required to be posed before groundwater is exposed in any phase within that slurry wall (phases 1-4, phases 5-7). 3) Please submit documentation for the direct costs provided in Exhibit L. 4) You will be contacted if additional information is required as the adequacy issues are resolved. Response: 1. See the response to Exhibit E comments. No costs for pumping/water management structures or flood control structures have been included in the Costs for a perimeter drain have been included in the reclamation costs. 2. The reclamation costs have been updated to include costs for the final slurry wall configuration. See the attached updated Exhibit L. 3. See the attached price proposal from Great Lakes Environmental and Infrastructure for details on direct costs for the slurry wall construction. 4. No response required. EXHIBIT S - Permanent Man-Made Structures (Rule 6.4.19): DRMS considers the entire proposed_permit area to be potentially affected area at this time. No evidence has been provided that any structure owners inside, or within 200', of the existing or proposed permit area have been provided with damage waiver agreements (other than the City of Greeley, Loloff Construction, and DCP Midstream as provided). This demonstration is required by DRMS prior to acceptance of a geotechnical stability exhibit such as the one provided for the first four phases of the proposed operation. DRMS cannot approve the permit amendment unless/until: 1) All structure owners within, and within 200 feet of the proposed permit area are provided with damage waiver agreements, and proof of this has been submitted to DRMS. To facilitate this process, please provide a detailed breakdown of all applicable structures by structure owners, and show the structures/locations on to a map depicting this information. Listing structures only by type, as submitted in Exhibit S, is inadequate. 2) Executed damage waivers for those structures have been received and submitted to DRMS, or a geotechnical evaluation has been conducted to determine that those structures that have not returned executed damage waiver agreements will not be adversely impacted by mining activity. The geotechnical assessment must provide information sufficient to demonstrate that the stability of any structures located within two hundred (200) feet of the operation or affected land will not be adversely affected. No, 305 Denver Avenue—Suite D• Fort Lupton CO 80621 • Ph: 303-857-6222•Fax: 303-857-6224