2024-06-25_PERMIT FILE - M2024032 (2)

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EXHIBIT D Mining Plan The proposed Mined Land Reclamation Board (MLRB) 5J Pit permit area contains substantiated aggregate resources and the 5J Pit operation is expected to provide aggregate construction materials to much of northern Colorado. As resources diminish from other aggregate mining operations, new supplies from the proposed 5J Pit will continue to provide construction materials to meet the northern Colorado demand. Introduction and Overview WH Property Holdings LLC owns property in the west half of Section 10, T9N, R68W. The proposed 5J Pit permit area will be leased by Connell Resources, Inc. and occupy a portion of the property for the operation of sand and gravel mine. In general, the proposed mining area is relatively flat and contained between the Interstate 25 right-of-way (I-25 ROW) on the east and the Burlington Northern Railroad ROW to the west. On the northwest side of the proposed permit boundary, the existing surface grade abruptly drops approximately 20 feet to the railroad ROW. Although relatively flat with no defined surface runoff channels, current surface drainage on the site appears to be from northeast to southwest with most stormwater drainage from the northern part of the proposed permit area ending up in the railroad ROW. The railroad ROW eventually drains to Coal Creek southwest of the proposed permit area. Nature of Deposit to be Mined The proposed permit area is located where the northern edge of the Colorado Piedmont transitions up to the foothills of the southern Rocky Mountains. Aggregate materials within the proposed permit area are composed of Pliocene and Pleistocene terrace deposits. The terrace deposits generally extend from the surface or near-surface to a variable depth of 20 to 25 feet below the ground surface. Pre-historic Quaternary Deposition was most likely created by streams that had been rejuvenated as a result of uplift at the close of the Tertiary period and increased water supply during the Pleistocene epoch. The under-lying Tertiary sedimentary rocks that include consolidated sand and gravel conglomerates were eroded, and the process of cutting and filling of channels was so widespread that gravel and sand were deposited in sheet-like beds. The proposed permit area is likely a fluvial terrace deposit associated with a former floodplain. More recent streams, such as Coal Creek southwest of the proposed permit area, have cut through the highly erodible over- lying unconsolidated material in most areas and do not generally have associated alluvial deposition. Traditional organic topsoil on most of the site is less than six inches in depth. Most of the soils are shallow to deep loams that are well drained. Over most of the identified sand and gravel deposit is a loamy, wind-mixed veneer layer of soil overburden material varying in depth from 51 Pit DRMS 112 Permit Application Page 4