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• Any existing registered wells within 600 feet of the slurry wall/compact clay liner <br />installation <br />• Significant wetlands, and/or woody riparian vegetation <br />20. In conformance with Rule 3.1.6(1), please quantify the vertical and horizontal extent of <br />impact to the groundwater surface and normal groundwater recharge or flow pattern(s) upon <br />completion of the slurry wall/compact clay liner installation. It is the Division's experience <br />with other slurry wall/compact clay liner installations that there is typically a "mounding" <br />and "shadowing" effect. These impacts are typically quantified through groundwater <br />modeling and field verified through a groundwater monitoring program. Also, please <br />describe and show on a map the location of any water feature (well, spring, wetland, riparian <br />vegetation) or permanent man-made structure (leach field, sewer line, highway bridge <br />support, roads, septic tank, etc) that is within the scope (radius) of influence of either <br />mounding or shadowing, and assess the impact to such feature or structure. Finally, please <br />describe the mitigation measures that will be employed to minimize the impact on the various <br />water features or man-made structures. <br />21. Please provide a map which depicts the lateral extent of the "floodway" and 100-year <br />floodplain for the Platte River, elevation of the 100-year flood surface, location of the <br />existing reclaimed lake, and proposed slurry wall/compact clay liner installation. <br />22. Please provide engineering designs and supporting calculations for the sizing of spillways, <br />culverts, and/or any other hydraulic structure that will be installed in the reclaimed pond. <br />Please note that any permanent hydraulic feature may need to be adequately sized to <br />withstand the velocity and volume of flows expected from a 100-year flood event. (We <br />suggest you refer to the attached copy of the Division's "In-stream Aggregate Extraction & <br />Reclamation Guidance Document" that provides specific design criteria, for sizing of <br />hydraulic structures). <br />Rule 6.4.12 Exhibit L- Reclamation Costs <br />23. As this site is exempt from providing a bond, under Rule 4.1.2(2), therefore no bond <br />calculation is required. However, per Rule 6.4.12(1) the Division does require the Operator <br />to submit all information necessary to calculate the costs of reclamation. This information <br />shall be broken down into the various major phases of reclamation. <br />Rule 6.4.13 Exhibit M- Other Permits and Licenses <br />24. Please inform the Division if the following permits are necessary: Air Pollutant Emission <br />Notice (APEN) and Storm Water Management Permit (SWMP) through Colorado <br />Department of Public Health and the Environment (CDPHE). If these or other permits are <br />necessary, please provide a revised Exhibit M. <br />Rule 6.4.19 Exhibit S- Permanent Man-made Structures <br />25. Where the slurry wall/compacted clay liner construction may adversely affect the stability of <br />any significant, valuable and permanent man-made structure located within two hundred <br />(200) feet of the affected land, specifically such as the Silverpeaks Waterline, but also <br />including any gas, water, power lines, roads, ditches, and any below-ground utilities, the <br />Applicant shall either: <br />4