Back to the resource library Noise Letter (T.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 Earthworks 2024 Impact Report Protecting Our Land, Water, and Culture: How to Use Mineral Withdrawals to Safeguard Public Lands from Mining Letter to the Australian Stock Exchange on CleanTech Lithium FACTSHEET: Increasing U.S. Crude Oil Export Capacity via Deepwater Ports Would Continue Harming Communities and the Climate