FOIA regulations, instructions, and general information can be found at the Department of the Interior's FOIA page.
FOIA Office for National Capital Region:
National Park Service
William Line
1100 Ohio Drive, S.W.
Washington, DC 20242
202-619-7177
Fax: 202-619-7302
Catoctin Mountain Park
Superintendent Mel Poole
6602 Foxville Road
Thurmont,MD 21788-1598
301-663-9330
Fax: 301-271-2764