Comment on FR Doc # 2013-08893

Dear Superintendent Wenk, I applaud your oft-stated commitment to making Yellowstone cleaner and quieter in winter, and your proposals for stricter noise and emissions requirements for snowcoaches and snowmobiles. I also strongly support your proposal to limit vehicle speeds to 35 mph on all transportation routes. However, I am very concerned about the proposed rule's backsliding in several areas which you have deemed are the foundation of making Yellowstone cleaner and quieter. This makes no sense and flies in the face of your own analyses. Yellowstone deserves no less than the highest protections. Specifically, I urge you to: Require that all snowmobiles use "best available technology" no later than the 2015-16 season. The technology exists today; there is no reason to delay implementation until 2017/18 as the proposed rule suggests. Don't give some snowmobiles a free pass. All snowmobiles entering the park should be required to have BAT. Do not drop the requirement that snowmobiles reduce carbon monoxide emissions by 25 %. All of your modeling of impacts to air quality, sound and wildlife relied on this reduction, and the technology exists today. Additionally, I wish to state my opposition to allowing non-commercially guided snowmobiles in the park. The requirement that all snowmobile users be with a professional guide has been instrumental in reducing harassment of wildlife and increasing visitor safety. Please do not drop this requirement. Thank you