NPDES Permit for Four Corners Materials' Bayfield Pit and Plant in Colorado

Under National Pollutant Discharge Elimination System permit number CO-0034665, Oldcastle SW Group, Inc., d/b/a Four Corners Materials, is authorized to discharge from its wastewater treatment facility located on the Southern Ute Reservation at latitude 37.1925° N and longitude 107.5847° W, La Plata County, Colorado, to the Los Pinos River.

This permit was issued on July 1, 2019 and modified on April 1, 2020.

• CO0034665 Four Corners Materials Modified Final Permit (pdf) (520.58 KB, April 1, 2020)
• CO0034665 Four Corners Materials Statement of Basis for Final Permit (pdf) (586.93 KB)
• CO0034665 Four Corners Materials Statement of Basis Addendum for Final Permit (pdf) (255.84 KB, April 1, 2020)