On February 1, 2001, a proposed consent decree in United States v. Natural Gas Pipeline Company of America, Civil Action No. 99-S-2419, was lodged with the United States District Court for the District of Colorado. In this action, the United States sought civil penalties for alleged violations of Section 113(b) of the Clean Air Act (CAA), 42 U.S.C. 7413(b), resulting from the alleged failure of Natural Gas Pipeline Company of America (NGPL) to obtain a Prevention of Significant Deterioration (PSD) permit from the U.S. Environmental Protection Agency (EPA) before construction in May 1979 of a natural gas compressor station, the Akron Compressor Station (also known as the "Niobrara Compressor Station"), located in Washington County, Colorado. The United States also alleges that NGPL operated the Akron Compressor Station as a major stationary source in violation of the CAA, 42 U.S.C. 7413, without an appropriate PSD permit, and without application of best available control technology.

Under the terms of the proposed consent decree, NGPL will pay a civil penalty of $215,000 for alleged violations of the CAA PSD program, and implement a Supplemental Environmental Project (SEP) that will be valued at $100,000 in order to resolve the United States' claims. The SEP requires NGPL to install equipment on two gas-fired compressor engines at the Crystal River Compressor Station in Glenwood Springs, Colorado, and on two gas-fired compressor engines at the Well Draw Compressor Station in Converse County, Wyoming. When the SEP is completed, total nitrogen oxide (NOX) reductions at the two stations are expected to be about 400 tons per year (TPY). The proposed consent decree does not require that NGPL take any injunctive measures because NGPL no longer owns the Akron Compressor Station at issue in this case.