National Historic Preservation Act, Section 106, Part. 800.1 (a): Section 106 of the National Historic Preservation Act requires Federal agencies to take into account the effects of their undertakings on historic properties and afford the Council a reasonable opportunity to comment on such undertakings...

National Historic Preservation Act, Section 106, Part. 800.1 (a): Purposes

(a) Purposes of the section 106 process. Section 106 of the National Historic Preservation Act requires Federal agencies to take into account the effects of their undertakings on historic properties and afford the Council a reasonable opportunity to comment on such undertakings...The goal of consultation is to identify historic properties potentially affected by the undertaking, assess its effects and seek ways to avoid, minimize or mitigate any adverse effects on historic properties.

Further Reading:

Full text of the National Historic Preservation Act of 1966