Back to the resource library Noise Letter (A.Dahl) September 7, 2006 | Share: Download Letter to the Colorado Oil and Gas Conservation Commission, asking that they limit the night-time noise level to 45 decibels. See All Related Resources Comments on Allegheny County Board of Health EQT Leto Dehydrator Air Quality Permit Comments on Colorado’s Air Toxics Rules Filtered Tailings in Indonesia: The Catastrophic Failure of a Disruptive Technology Tailing yang Difilter di Indonesia: Kegagalan Katastropik dari Sebuah Teknologi Disruptif