2021-09-09_REVISION - M2004044 (10)

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• Providing flood irrigation to address concerns over impacts to sub-irrigated lands adjacent to the site. Al agrees to provide the water level data collected from monitoring well sampling to the DRMS with the annual report for the site. • If a groundwater mitigation action is required, Aggregate Industries will notify the DRMS of the condition, action taken and result. A complete well inventory "Well Inventory, Tucson South/Haake, Aggregate Site near Brighton Colorado dated March 13, 2004" was submitted to the Division with Exhibit G of the original application for this site. The information is on record at the Division. Since that time Aggregate Industries has obtained the required well permit for this property. Aggregate Industries, through the SEQ well permit process, gave notice to well owners within 600 feet of the mining boundary. The potentially impacted well owners entered into agreements with Aggregate Industries for protection for the senior vested water rights. Many of these wells were near a previously permitted unlined cell south of Highway 7. This unlined cell was removed from the permit with a Technical Revision. Impacts to these wells is now considered negligible due to the construction of the slurry wall prior to mining. Potential Reclamation Impacts Impacts due to mine dewatering are not anticipated due to the presence of the slurry wall constructed prior to mining of the East and West Areas. Once mining and reclamation are complete and dewatering pumps are turned off, potential impacts to surrounding wells from mine dewatering will cease. Reclamation Impact Mitigation Plan Although impacts and damages are not anticipated, it is the intent of the operator and property owners to operate responsibly and to mitigate damage to wells or structures that is directly attributable to the mining and reclamation of the Tucson South Resource site. If mine or slurry wall reclamation creates injury to surrounding properties, the applicant will take all necessary actions to remedy the injury. The approved well permit addresses potential impacts to wells within 600 feet of the Permit Boundary. Additionally, if it is determined that mine reclamation creates mounding impacts to surrounding structures or water resources, the applicant will take appropriate corrective action. Impacts would trigger mitigation measures that may include, but are not limited to: • Installing surface or underground drainage systems to transport groundwater from mounding areas to shadowing areas. • Diverting surface water flows to recharge ponds in shadowing areas. Water Quality Mining and reclamation operations shall comply with the Colorado Department of Public Health and Environment National Pollution Discharge Elimination System (NPDES) regulations. A Colorado Discharge Permitting System (CDPS) permit for stormwater management and discharge flows to protect surface water quality on and off the Aggregate Industries—Tucson South Amendment—MLRB 112 Permit Application Exhibit G-9