Laserfiche WebLink
The applicant received approval of technical revisions in May of 1986 to extend <br />development work from the No. 5 Mine to the F seam of the No. 6 Mine. The waste <br />rock produced was approved for placement against the existing highwall of the 5A <br />Portal. Designs for this development rock placement are included in Exhibit 40. The <br />total volume approved for placement is 12,000 cubic yards. <br />The applicant will dispose of underground development waste within the existing No. 9 <br />Portal Excavation. These portals have been sealed. The approved reclamation plan <br />calls for the backfilling of the existing excavated incline. The applicant will utilize the <br />excavation to dispose of waste. Because there would be no elevated embankment, slope <br />stability is not a concern. Minimal ground waters might invade the unencapsulated <br />waste but are projected to produce insignificant amounts of leachate. A monitoring well <br />will be installed at the No. 9 Mine Portal Excavation to monitor potential ground water <br />within 90 days of final grading of the No. 9 Mine Portal Excavation. <br />A plan for post- mining topography was approved as a portion of original Permit No. <br />C -1981 -044 for the Williams Fork Strip Pit No. 2. The approved configuration requires <br />the regrading of approximately 240,000 cubic yards of spoil. The applicant was allowed <br />to postpone final grading, because the installation of a second set of portals for the No. 9 <br />Mine was proposed at this location. These portals, Nos. 9A, were never installed. <br />Backfilling and grading of the Williams Fork Strip Pit No. 2 commenced August 10, <br />1987. Initial seeding occurred that fall. <br />VIII. Revegetation <br />Pre -mine vegetation information is provided in Section 2.04.10. Additional information <br />is provided in Exhibit 14, Supplemental Vegetation Information. Vegetation <br />communities are shown on Map 20 - Vegetation Map. Section 2.05 of the permit <br />application describes the revegetation methodology and revegetation standards for each <br />type of disturbed area. The Williams Fork Strip Pit revegetation plans and revegetation <br />success criteria are given in Exhibit 24, Williams Fork Strip Pit Reclamation Plan. The <br />Reclamation Plan Map (Map 29a) indicates the planned post -mine uses (vegetation <br />types) and the reference areas for the reclaimed areas. <br />A vegetation inventory was conducted at the Williams Fork Mines in July of 1981. The <br />operator sampled three undisturbed big sagebrush stands adjacent to the surface <br />disturbance. The vegetation sample areas were similar in aspect, elevation, and soils to <br />the disturbed areas. The information collected in that study is located in Section 2.04 of <br />the permit application. No threatened and /or endangered plant species were identified <br />within the disturbed area during the vegetation inventory. <br />Roughly one -third of the permit area is covered by croplands. MCM has divided the <br />croplands into two categories: 1) irrigated hayfields in the Williams Fork River bottom <br />areas, and 2) dryland wheat, found on cleared hillsides which were once sage - <br />dominated. Productivity data is provided for the irrigated hayfields on Table 69 of the <br />permit application. Wheat production is given in Table 70. <br />Williams Fork Mines 31 Permit Renewal 06 <br />C- 1981 -044 December 8, 2014 <br />