2025-04-22_REVISION - M1979045 - Laserfiche WebLink

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EXHIBIT D MINING PLAN (cont) This sandstone layer may eventually prove to be the bottom of the mined area on the eastern portion of the site if mining the clay here is not economically feasible or if the clay is not of sufficient quality. Additionally, the sandstone and other miscellaneous rock products found within the clay seam may be mined. Since this porous, permeable sand overlays the clay material, it is not expected that a leachate would reach this rock. Until mining progresses and concludes to the east, the final condition of the mined area will not be known. Overlying these steeply dipping bedrock units at an angular unconformity is the Rocky Flats alluvium (Qrf) (see Sketch 1) . The alluvium is boulder and cobble gravel, predominantly quartzite. In the pit area the alluvium varies in depth from 12 to 50 feet but can be as thick as 80 plus feet the farther east you go in the mine. We expect the average thickness on the affected land to be about 45 feet . Current Conditions Exhibit C1 — Boundary and Structures Map shows the outline (in yellow) of the permit/affected lands area as amended, structures, adjacent landowners, and existing facilities. It also shows the different labeled areas comprising the Church Pit and the Rocky Flats Pit and describes which areas will remain, be added to, or subtracted from each of respective current permit boundaries to arrive at the amended permit boundaries . There are no permanent buildings, no power or phone lines, and no gas, water or sewer pipelines on the affected land. Exhibit C2— Current Conditions Map shows topography and hydrologic factors . At this time the clay operations area is developed and mining has progressed as planned. There are still sand and gravel areas and sandstone areas that are left to be developed in the future. Areas on the east and west side are used for material storage associated with the clay mine, a composting area, and a storage area operated by the mineral owners . Mining Plan Exhibit C3 - Mining Plan Map shows the proposed mining plan with the direction of mining. Once fully approved, this amendment adds Area D, located to the east of the existing clay pit and as depicted on Exhibit Cl, to the existing permit area. This new area encompasses an existing pile of valuable clay material imported years ago from another mine and is also used for a composting operation. The areas to be mined for sand and gravel will include all lands not already mined for clay, less the required setbacks along the new ditch right-of-way. Sandstone and other miscellaneous rock products will be mined on the areas east Lakewood Brick and Tile CO Church Pit— M-1979-045 Amendment 02 April 16, 2025 10