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Mr. Connor Drinkard <br /> RE: Carr Pit East M-2022-005 <br /> June 27, 2022 <br /> 15. The estimated duration of each mine phase is summarized in the following table. Ultimately, <br /> the duration of each mine phase is dependent upon market demand. <br /> Mine Phasing Summary <br /> Total Acreage Duration <br /> Mine Phase Mine Area (acres) (years) <br /> Phase I North 102.7 5-8 <br /> Phase II South 23.2 1-2 <br /> TOTAL 125.9 6-10 <br /> 16. The Phase II mining area south of Lone Tree Creek will be accessed by an internal haul road <br /> or elevated conveyor. An internal haul road has been used previously at the Carr Pit site <br /> (M-2014-001) and it is anticipated that a similar haul road design would be constructed for <br /> the Carr Pit East site. Design plans for the Carr Pit creek crossing are attached. Please see <br /> adequacy response #3, #9, #10, and #11 for additional information regarding the protection <br /> of the Lone Tree Creek channel, associated wetlands, and drainage riparian area. <br /> 6.4.5 Exhibit E—Reclamation Plan <br /> 17. The sand and gravel deposit being mined does not extend to a depth that contacts <br /> consolidated shale/sandstone parent or bedrock material. Instead, test pits on the Carr Pit East <br /> site and excavations on the Carr Pit (M-2014-001) site indicate an unconsolidated silty clay <br /> material of varying depths underlies the sand and gravel deposit. Additionally, we do not <br /> believe that all of the soil horizons presented on the site soil profiles function as necessary <br /> plant root zones. Excavation of the grasses and low growing forbs on the site suggest isolated <br /> plants and bunch or sod forming grasses typically six inches deep. We believe the described <br /> soil/growth medium description in the reclamation plan is adequate. <br /> 18. Non-noxious and List C weed species will be controlled during reclamation, primarily if they <br /> impact the development of the desired reclamation species. <br /> 19. All surface water discharges from the permit boundary will comply with water quality <br /> standards as established by the Colorado Department of Public Health and Environment. <br /> Approval under the Colorado Discharge Permit System (CDPS) General Permit for <br /> Discharges Associated with Sand and Gravel Mining and Processing will be obtained prior to <br /> operations. Coverage under the permit will include a site description including anticipated <br /> stormwater outfall locations, potential pollutant sources, site inspections, and a Stormwater <br /> Management Plan detailing operations and best management practices used to minimize <br /> impacts to stormwater quality. <br /> In general, during final reclamation, sloping, grading, and revegetation will be the primary <br /> techniques used to control surface water runoff and quality. The steepest slopes on the <br /> t= Ue C Ca r-th Page 6 of 12 <br />