2021-09-16_REVISION - M1983033 - Laserfiche WebLink

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Walstrum Spur Amendment, Exhibit D—Mining Plan revised September 2021 2.0 MINE OVERVIEW AND PERMITTING HISTORY 2.1 Permitting History The first Walstrum Quarry permit application was approved on June 23, 1983 for 125.9 acres. The first amendment to the reclamation permit was approved on July 25, 1985 and did not affect the acreage. The second amendment to the reclamation permit was approved on August 27, 2002 and increased the area to 292.1 acres. On June 5, 2020, DRMS approved a reduction in acreage request releasing Stages X and Z from the permit. The current permitted area of the Existing Quarry is 285.7 acres. 2.2 Comparison of Permit Boundary Area to Affected Area The purpose of the proposed Spur Amendment is to incorporate additional lands into the Existing Quarry operation to extend the material reserves available and thus the life of the mine. Exhibit C illustrates the Existing Quarry and the Spur Amendment. Note that the permit boundary is different than the affected lands boundary. Both areas are illustrated in Exhibit C-3. The Spur Amendment contains a total of 463.6 acres of which 51% will remain undisturbed and 49% will be affected area. The Existing Quarry contains a total of 285.7 acres of which 7% will remain undisturbed and 93% will be affected area. Together, 34% of the Existing Quarry and Spur Amendment will remain undisturbed. These areas are being preserved to provide buffer zones around the mining area, protect wildlife migration corridors and habitat, and maintain the scenic beauty of the adjoining Clear Creek Canyon and its environment. A summary of the permit boundary area compared to the affected area for the Existing Quarry and Spur Amendment is presented in Table D-1. Table D-1 —Summary of Land Acreage PermittedArea Permit Area Affected Area Undisturbed Area % of (ac) (ac) inside Permitted Area Area . . Existing Quarry 285.7 264.8 20.9 7% Spur Amendment 463.6 229.0 234.6 51% Total 749.3 493.8 255.5 34% 2.3 Existing Land Uses The Existing Quarry is mined in accordance with DRMS permit M-1983-033. The Spur Amendment is currently undisturbed land. Easements have been granted for utilities and access within the Existing Quarry and to adjacent property owners. These easements provide access via a two-track jeep road and/or utilities to adjacent landowners and cellular communications towers located on the Young Ranch East LLC (YRE) parcel to the adjacent east of the Existing Quarry. AFS owns and maintains the private jeep road on the mine property and users of the jeep road are subject to Mine Safety and Health Administration (MSHA) part 46 requirements. 2.4 Screening Natural landforms and undisturbed areas are provided in Stage S, between the Existing Quarry/Spur Amendment and Highway 6 (see Exhibit C-3) to help screen most of the manufacturing areas and mining activity from neighbors and highway traffic. As part of this amendment application, additional undisturbed land is being added to Stage S to provide additional screening in the Spur Amendment area. The additional land will mostly screen views from Highway 6, Highway 119, lower sections of 1-70, and homes at lower elevations of the surrounding communities into the Existing Quarry and Spur Amendment area. The additional Stage S land in the Spur oTETRA TECH P a g e 2 1 9