Exhibit D 1 - Laserfiche WebLink

Home Browse Search

6 | P a g e for a long period of time, a single ripper behind a dozer shall be used to reduce compaction for a minimum of 15”-18”, which will promote growth in this area. This area has previously been seeded with little success; therefore, this decompaction effort will increase potential growth. Once ripped, drill seeding method with soil conditioners shall be used as outlined in the General Seeding Requirements below. Although this area has been previously seeded, the method outlined in the requirements below was not utilized and the use of ripping, soil conditioners, and drill seeding, this area should see successful growth. The upper bench of area 6 is considered the main mine bench where the portal entrances is located as well as the secondary escape access. Both the portal entrances and the secondary escape will need to be closed off per Colorado Inactive Mine Reclamation Program (IMP) – General Bid Specifications. The portal entrances shall be closed following the guidelines in Section 15, Concrete Masonry Unit Bulkhead Seal Closure. The details of this are shown in Standard Drawing No. 12 of the IMP Specifications. There is already an existing masonry wall for the entrance into the portals, however the operator shall ensure the existing walls meet the specifications within the IMP Spec Book. Any modifications that need to be made to meet the specifications shall be completed. The north portal opening dimensions are approximately 12’x24.5’ and the south portal opening is approximately 12’x23’. The Secondary Escape, a 48”-inch CMP pipe, shall also be closed per the Hollow Core Shaft Closure details and specifications shown in Section 5 and Standard Drawing No. 2. The access shall be a locking grated cover. The building and all excess materials removed while completing the closures shall be removed and disposed of. The secondary escape includes a ventilation shaft house that is a 15’x20’ metal building that will be torn down, removed, and disposed of at the Garfield County Landfill approximately 27.75 miles away. There is no foundation associated with the building. There are also 15 jersey barriers that will be removed and repurposed for oil and gas operations. There is also an existing gravel access road in the upper portion of Area 6 that connects to the main access road. This access road is comprised of ¾” gravel and shall be removed, resulting in approximately 257 cubic yards of material. This material shall be removed and repurposed for maintenance of the main road through the colony mine. This reclamation efforts results in ~0.16 acres of disturbance that shall be reseeded following the General Seeding Requirements below. There is also a 0.005 acres are east of the secondary access building to be removed that will require weed mitigation following the weed management plan below. The Portal Entrance also has water seepage that has been sampled and tested with no concern. Please see the ‘Colony Mine Water Report 2025’ attachment for reference. Therefore, the grated closure will allow for seepage to continue, and no mitigation or grading is needed for the water. The drainage currently seeps from the entrance and runs along the bottom of the high wall within a small ditch. There is not enough flow to necessitate a new flow path for drainage from the mine to leave the mine bench; it percolates into the soils before leaving the bench with minimal ponding. The mine bench also has 4 different monitoring pin locations which consist of a PVC pipe sticking out of the ground with a piece of rebar located inside the pipe. All these monitoring locations need removed. PVC pipe and rebar shall be cut off at minimum 2.0’