2021-09-09_REVISION - M2004044 (10)

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Todd Creek Farms Metropolitan District 1 The Todd Creek Farms Metropolitan District 1(Permit#20989-R-R) is located approximately 150 feet south of the East Area. It is classified as domestic and stock at 955 gpm. This well has a "Do not divert" order. Todd Creek Farms Metropolitan District 1 The Todd Creek Farms Metropolitan District 1(Permit#77271-F) is located approximately 150 feet east of the East Area. It is classified as Industrial Municipal. Todd Creek is aware of the future slurry wall and has an agreement with Al acknowledging the construction of the slurry wall and potential impacts to well yields. Todd Creek Farms Metropolitan District 1 The Todd Creek Farms Metropolitan District 1(Permit#77270-F) is located approximately 150 feet east of the East Area. It is classified as Industrial Municipal. Todd Creek is aware of the future slurry wall and has an agreement with Al acknowledging the construction of the slurry wall and potential impacts to well yields. Todd Creek Farms Metropolitan District 1 The Todd Creek Farms Metropolitan District 1(Permit#77323-F) is located approximately 600 feet northeast of the East Area. It is classified as Industrial Municipal at 500 gpm. This well is near the South Platte River and should have ample supply from the river. Donald D Stough The Donald D Stough Well (Permit# 201932) is located approximately 500 feet north of the East Area. It is classified as a domestic well. The well is downgradient of the slurry wall and may be affected by the shadow effect in which groundwater levels may be slightly lower than historic. If the well is affected, Al will adhere to the groundwater mitigation plan discussed below. (3) The Operator/Applicant shall provide an estimate of the project water requirements including flow rates and annual volumes for the development, mining and reclamation phases of the project. Water use at the site is governed by the current well permit (Permit No. 81342-F) and the associated Substitute Water Supply Plan (SWSP) for the site. Water use will be at its highest during the mining phase of the project. Mining at the site will intercept groundwater tributary to the South Platte River. Consumptive uses of groundwater at the site include evaporation from groundwater exposed to the atmosphere, water retained in material hauled off sites, and water used for dust control. Evaporative losses at the site are attributable to exposed groundwater in the dewatering trenches in the West and East Areas, in the settling ponds, and the dewatering trenches constructed following completion of the slurry walls surrounding the West and East Areas. The maximum exposed surface area during the life of the mine is equal to the combined total dewatering trenches surrounding the West and East Areas, and the settling ponds associated with the West and East Areas. The maximum exposed surface area during the life of the mine is estimated at 4 acres. Additional exposed groundwater from the old Tucson Pit (DRMS Permit No. M-1991-140) has been incorporated into the permit boundary of the Tucson South Pit. Therefore, the maximum Aggregate Industries-Tucson South Amendment-MLRB 112 Permit Application Exhibit G-3