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 FACTSHEET: Increasing U.S. Crude Oil Export Capacity via Deepwater Ports Would Continue Harming Communities and the Climate FACTSHEET: DOT’s Outdated Evaluation of Deepwater Crude Oil Ports Civil Society Letter to Industry CEOs on the Consolidated Mining Standard Initiative Impacts of Lithium Mining to the Santa Rosa Lagoon Lacustrine System, Salar de Maricunga