2025-03-14_PERMIT FILE - M2025016 (12)

Home Browse Search

// PAGE 3 EXHIBIT D Raptor Materials, LLC Cogburn Sand, Gravel, and Reservoir Project February 2025 A Regular Impact (112) Construction Permit Application – Colorado Division of Reclamation Mining and Safety, Office of Mined Land Reclamation No plant or processing operations will be installed or occur on this site. Pit-run (unprocessed materials) will be loaded onto a conveyor on the east side of Pit 125A that will deliver material to the existing north-south conveyor along the east side of Weld County Road 17, which will convey material to be processed at the existing P115 Kurtz plant. Extracted materials from Pit P125B will likewise be loaded onto a conveyor that will tie into the Pit P125A conveyor for offsite transport. Processed material will then be transported directly from the plant to area markets as needed and where appropriate. The conveyor will be a short transfer belt to convey extracted sand and gravel over WCR 17 to the existing conveyor on the adjacent Kurtz operation (DRMS Permit 1999-006). The conveyor will be set on an elevated structure at appropriate heights to enable access to pipeline in easements and required clearance (18-feet) over the county road. The conveyor will be supported by legs at intervals of approximately 40 feet with typically 6- x 2- x 2-foot concrete blocks sitting on ground surface used as necessary to anchor the legs. The conveyor between Pits P125B and P125A will span the Last Chance Ditch and metal (or other appropriate material) pans will be installed under the conveyor structure to prevent spillage into the ditch or onto the county road. The design will be similar to other Raptor locations where an extended span has been required to cross a county road. Final conveyor specifications are to be determined however belt width is anticipated in the range 30-54”. Extracted material will be loaded immediately onto the conveyor for offsite transport; therefore, only a limited amount of temporary material stockpiles is expected onsite as part of logistics for offsite transport. Raptor will minimize of impacts to mule deer population in the riparian corridor along the St. Vrain Creek during construction of the project and during winter. While no current extraction is proposed in the riparian corridor, Raptor commits to construction activities will only be conducted during daylight hours and to not leaving open trenches or pits during construction that could result in harm to animals. Plant placement will assure that plant noise is well below that of the nearby traffic. Relative to noise, traffic travelling on area roads at 55 mph or above is approximately 70.0± decibels within 100 feet from the centerline of the Highway. Noise at ground zero at a cone crusher, as measured by a hand-held meter, is at 80.0± decibels, dropping to 70.0± decibels at I00.0± feet from the center. Backup sirens and heavy equipment averaged 60.0± to 75± decibels. The level drops an additional 5.0± decibels for every 100.0± feet from the source of plant noise, achieving residential background levels at a total setback of 400± feet. Noise levels at areas of extraction are buffered with increasing depth of extraction. Section (b) (b) earthmoving; General earthmoving including topsoil, overburden and sand and gravel is described in Section (a) above. Material transport of raw materials from extraction locations to the plant site (located on adjacent Raptor Materials Kurtz property, DRMS permit number M1999-006) will occur via conveyor (see route on Exhibit C-2: Extraction Plan Map). This will in turn serve to minimize impacts to area transportation corridors. The actual location, extent, and nature of the conveyor systems not otherwise designated in this submittal will be provided as updates in the required DRMS Annual Reports. Section (c) (c) all water diversions and impoundments; and