For many projects monitors are required by entities to watch for cultural resources under Section 106. Monitors can cost $100+ an hour. In addition dependent upon the cultural resource present, more than 1 monitor is required (tribal and archaelogical).
Reduction of the efforts for monitors could include: for cultural allowing a maximum of 1 monitor, unless tribal entities choose to participate/volunteer in addition to archaelogists. Restrict monitors to areas where there are KNOWN cultural sites. Often surveys have already been conducted.