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7. Please locate any fuel tanks on the maps and inform the Division how the tanks will be lined or <br />bermed in the event of a spill or leak. <br />Rule 6.4.5 Exhibit E- Reclamation Plan <br />The applicant states that, "the pit will be mined at slopes that range from 2:1 to 3:1 so backfilling of <br />the pit will not be necessary." This statement could essentially allow for all slopes to be reclaimed to <br />2:1. If the pit is mined to a depth of 8550 ft. as stated by the applicant, then the depth of the pit will <br />range from 10 feet on the eastern side to 100 feet on the western side. A reclaimed slope of 2:1 over <br />such a deep pit will be difficult to stabilize and revegetate and does not support the postmining land <br />use of rangeland. Due to these constraints, the Division will not approve a reclaimed slope of 2hav. <br />However, the Division will accept 3h:ly slopes as suggested by the applicant. <br />9. Slopes reclaimed to 3h:ly on the west side of the pit will produce slopes greater than 300 feet in <br />length. Please state how the applicant intends to stabilize the reclaimed land to control erosion on <br />such long slopes. The applicant will need to implement techniques to break down the slope length <br />such as including benches or berms. Please address accordingly. <br />10. The applicant states that 4" of topsoil will lie replaced on site after mining is completed. Exhibit C-2 <br />depicts two general soil types on site; USDA SCS Soil Unit 136 and 161. Unit 136 has a topsoil <br />depth of 0-5 inches, but an associated soil depth for Unit 161 is not listed. The Division will need the <br />depth of this soil unit in order to determine if a 4" topsoil replacement depth is adequate. <br />11. Two aeeas depicted on Exhibit C-2 are noted as GP (gravel pits). Please inform the Division if any <br />topsoil was salvaged and stockpiled for these areas. The 110 permit approved on November 22, 1978 <br />states that 12" of topsoil will be replaced in these azea. Please inform the Division as to the location <br />of the topsoil that was to be used to achieve a 12" replacement depth. <br />12. Please state the mining and reclamation plan for the small pit depicted west of Phase 1. <br />13. The reclamation plan map depicts a lazge p}t area, approximately 184 acres in size that will be graded <br />to a bottom elevation of 8550 feet. Under this plan surface water from runoff and rainfall will <br />accumulate in the pit. Please explain how the water will be removed from site both during the mining <br />operations and upon reclamation of the site: Under the CDPS Stormwater requirements, if <br />stonnwater runoff is intercepted by this operation and is not diverted or captured in priority, it must <br />be released to the stream system within 72 hours. This may require a dischazge permit from CDPHE- <br />WQCD. Otherwise, the operator will need to make replacements for evaporation. Please address <br />accordingly. ' <br />14. Please further explain the surface water mapagement plan for the site upon reclamation. Mining will <br />intercept a number of surface water drainages as a result of the mining operation, and there appeazs to <br />be no positive drainage flow from the pit. Water accumulating in the pit may breach a low area and <br />result in off-site impacts. Piease revise the reclamation plan to address positive drainage flow from <br />the pit. <br />Rule 6.4.7 Exhibit G- Water Information <br />15. The applicant states that 5 piezometers have been installed to detemmne the groundwater to be at an <br />approximate elevation of 8520 feet. In addition, the applicant is monitoring the piezometers monthly <br />to determine the seasonal high groundwater elevation. The applicant will need to supply the Division <br />with 12 months of baseline data in order to determine the seasonal high groundwater elevaton. The <br />applicant will need to submit this data to the Division during the review period for this conversion <br />application or in the form of a revision to the permit prior to the commencement of mining as stated <br />in the application. In addition, the applicant should stay 5 feet above the seasonal high groundwater <br />elevation unless it can be demonstrated the mining will not intercept groundwater at a lesser depth. <br />