Back to the resource library Noise Letter (A.Dahl) September 7, 2006 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 Human Rights Violations, Abuses, and Incidents Registered During the Protests Against the Mining Contract in Panamá New Mining Standard Initiative Falls Short on Human Rights and Environmental Accountability, Poses Risks for Automakers Mine Proposals that Include Marine Waste Dumping Dumping by the Numbers