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1.1(20), and cannot be used as backfill in the reclaimed pits. Please verify that woody vegetation will not be backfdled <br />in the pit. <br />8. The applicant states that the entire site will be graded to duect storm water runoff towazds ditches and dewatering <br />systems. Please specify the dimensions and location of these ditches on the mine plan map. <br />Rule 6.4.5 Exhibit E -Reclamation Plan <br />9. The applicant proposes to reclaim portions of the site as water storage with ponds surrounded by slurry walls. Enclosed, <br />please find a copy of the Division's guideline titled, "Guide to Specification Preparation for Slurry Walls and Clay <br />Liners as a Corx~onent of a Colorado Mined Land Reclamation Permit" As noted in this guideline, operators may <br />choose the option to bond for 100% installation or replacement cost of a slurry wall or pit liner or may select a regulated <br />construction option and become eligible fora 20% installafion or replacement bond. The guideline contains information <br />that must be submitted by the applicant to be eligtble for the 20% bonding option. Please inform the Division if the <br />applicant intends to bond for 100% of the sluny walls, or will provide the necessary information for the 20% bonding <br />option. <br />10. Please further explain the reclamation plan for the sediment pond, sumps and ditches proposed for the mining operation. <br />11. Please state how much mulch per acre will be applied. <br />12. The seed mixture noted on Table E-1 is completely different than the seed mixture noted on the Reclamation Plan Map <br />(Exhibit F). Please explain this discrepancy. <br />Rule 6.4.7 Exhibit G -Water Information <br />l3. Please provide an estimate ~f the project water requirements iaeludsag flaw rates and annual volumes from the <br />development, mining and reclamation phases of the project as required by Rule 6.4.7(3). <br />14. The applicant should be aware that 3.1.6 (1) of the Constmction Material Rules and Regulations requires that <br />disturbances to the prevailing hydrologic balance of the affected land and to the surrounding azea and to the quantity and <br />quality of water in surface and groundwater systems both during and after the mining operation and during reclamation <br />shall be mininilzed. In that the proposed operation includes dewateting of the pits and installation of a slurry wall, the <br />potential for impacts to groundwater exists. Please indicate how the hydrologic balance of groundwater in and azound <br />the permit site will be monitored. <br />15. Rule 6.4.7(1) requires the operator to duectly state if surface water or groundwater will be affected by the mining <br />operation. The applicant located wells within 600 feet of the affected land. A majority of the identified alluvial <br />groundwater wells aze within 200 feet of the mining limit, and will most certainly be impacted by the mining operation. <br />In accordance with Rule 6.4.7(2)(b), the Division requests that the applicant identify and characterize the aquifer to be <br />mined in or through. The Division also requests that the applicant define or predict the cone of depression or shadow <br />and mounding effect expected for any azeas to be dewatered and dry mined or as a result of installation of a slurry wall. <br />The cone of depression and assessment of other effects should define, at a minimum, the horizontal and vertical extent of <br />expected impacts. If during the assessment, the applicant detemrines that a drawdown or shadow effect will occur offsite <br />that may impact a current groundwater user, the applicant should explain any mitigation measures to be implemented and <br />trigger points that would put mitigation measures into effect. <br />16. Please describe how the drawdown of the pit or shadow effect will impact the stmctural integrity of the surrounding <br />wells, surface water drainages, activities which rely on groundwater in the vicinity of the site, and the wetlands located <br />next to Little Dry Creek and any mitigation measure to be implemented and trigger points that would put mitigation <br />measure into effect. For example, the Division received letters of objection to the application from John Windell of <br />Aquatic Wetlands Company and from Leonard Vazgas regazding impacts to their irrigation wells and to the nursery <br />operation. The letters aze attached for reference. Please address impacts to the wells and nursery operation, as well as <br />the other items and features listed above as a result of the mining and reclamation operations. <br />17. The Division received comments from the Office of the State Engineer (OSE) regazding the application. The letter is <br />enclosed for reference. Please acknowledge the conditions for approval noted by the OSE. <br />