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Routt County approves Twin (Milner) Landfill vertical expansion (Module 8) with conditions
Summary
Commissioners approved Twin Enviro/Apex Waste Solutions’ request to add Module 8 to the Milner landfill permit boundary (certificate of designation) and amended the special use permit, subject to conditions addressing visual mitigation, erosion, stormwater controls and state construction oversight.
Routt County commissioners approved an amendment to Twin Enviro LLC’s special use permit and a certificate of designation to add Module 8, a vertical and lateral expansion at the Milner (Twin) landfill, with conditions and the state’s recommended requirements.
The board voted to allow construction of Module 8 (approximately nine acres) and accepted staff’s recommendation after a planning review; the Colorado Department of Public Health and Environment (CDPHE) submitted a letter recommending approval after its technical review and requested conditions the county included in the certificate of designation.
Staff and Apex/Twin representatives said the expanded cell will extend the useful life of the Milner landfill and that CDPHE retains technical oversight: the state reviews engineered design and operation plans (EDOP), inspects construction, requires quality assurance, and will receive final construction reports and compaction/testing data. Routt County’s role is to review off-site impacts such as traffic, visual impacts and nuisance control and to issue the certificate of designation. Commissioners discussed visual impacts from Highway 40/Milner hill and whether a 10–12-foot berm should be required; planning commission did not require a berm and staff recommended mitigation language (condition 26) instead.
Apex told the board Module 8 construction was targeted to begin in July and that construction drawings have been reviewed by county staff and CDPHE. Borrow areas for construction material were shown in the submittal; the applicant noted that ongoing stormwater, interim cover and wind-blown litter issues found in past inspections have been addressed and maintained since the March inspection.
The board approved the special-use-permit amendment and the certificate of designation with the conditions listed in the record, including CDPHE-requested conditions. Staff emphasized that CDPHE is the technical authority for liner, compaction and groundwater protection matters and that Routt County will continue to monitor off-site impacts and enforce conditions in its permit program.
The motion to approve included modified findings of compliance with the Routt County Unified Development Code and the Master Plan. Commissioners noted ongoing coordination with CDPHE and said the county expects the state to conduct required construction inspections and receipt of quality assurance documentation.
