2020-06-25_REVISION - C1981035 (35)

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Environmental Assessment ■ GCC has and will continue to solicit observations from neighbors to assist in identifying noise that has not otherwise been addressed. Design Feature 4b: Noise and vibration from truck traffic GCC has prepared a noise and visual buffering plan for site-specific conditions at 2541 and 3230 CR 120, which provide a definitive commitment to directly address this design feature. These residences are immediately adjacent to the road and thereby warranted buffering from noise and dust. Buffering measures included in the plan include sound walls,landscaping, and berming as the respective condition provides to directly address and achieve compatibility. Impacts directly mitigated with this plan include noise,traffic, dust,unsightly views and other negative impacts,which are perceptible by adjoining land uses along north CR 120. The noise and visual buffering plan will be implemented by GCC at the discretion of the respective landowners; and will be available for implementation from the time of approval of this proj ect up until the completion of Phase 5 road improvements. In addition to buffering and screening,which have the potential to mitigate certain impacts for those directly adjacent to the road,the following design criteria will be implemented for all residents along CR 120: ■ At any time prior to the completion of Phase 5 road improvements, GCC shall reimburse La Plata County up to $5,000 for expenses incurred hiring a consultant to determine the adequacy and efficacy of any buffering plan and/or installation required as part of this class II land use permit. ■ Haul trucks must travel at no greater than 10 mph or as determined by the LPC Engineer on gravel portions of the road within 200 feet of residential structures,unless the La Plata County Public Works Director authorizes a faster speed in writing. ■ Sound measurements at 50 feet from the edge of north CR 120 between State Highway 140 and King II Coal Mine attributed to trucks hauling coal from the King II Coal Mine shall not exceed 86 A-weighted decibels (dBA) at any time. Design Feature 5: Traffic To provide for the safety of the traveling public,residents, and mine traffic,the route proposed for use by haul trucks needs to be improved to minimum county standards as per LPCLUC 74-91(c), design standards. GCC proposes to achieve these minimum requirements via an executed RIA that captures the improvements within a phased (5 phases) development schedule. Executed in conjunction with the land use permit, each scheduled improvement under this agreement would provide improved and safer conditions to the roadway,while progressively achieving compliance with the land use permit. To improve conditions on CR 120 related to traffic and road hazards created by the coal truck traffic, GCC has committed to the following measures,which are also illustrated in Map A-7, CR 120 N Roadway Current Conditions and Proposed Improvements in Appendix A: ■ GCC will pave and improve CR 120. GCC will pave certain gravel portions of CR 120 with the temporary widening of the 90-degree corner at mile marker 0.3 2016. The first scheduled paving of the gravel portions of CR 120 will be adjacent to residences near the end of the existing DOI-B LM-CO-S010-2011-0074-EA September 2017 -47-