Texas Natural Resource Conservation Commission Austin Texas Interoffice From: Lawrence E. Pewitt, P.E., Director, Permits Division To: Permit Engineers Date: August 15, 1985, Updated October 4, 1994 Subject: Visibility Protection - Prevention of Significant Deterioration (PSD) Permit Applications A PSD permit review requires a consideration for visibility protection for Class I areas. These areas consist of the Big Bend National Park in Brewster County, the Guadalupe Mountain National Park in Huspeth and Culberson Counties and the Wichita Mountain Wilderness Area in Oklahoma when a PSD permit is under review in Texas. A copy of any application for which PSD review is required within 100 kilometers (62 miles) of these parks must be sent to the Federal Land Manager of the area and to: Mr. Wilbur N. Ladd, Jr. Assistant Regional Director Refuges and Wildlife, Region 6 United States Department of the Interior Fish and Wildlife Service Post Office Box 25486 Denver Federal Center Denver, CO 80225 Telephone Number: (303)-969-2071 for John Notar