The work will be performed between 7 a.m. to 3 p.m. daily until the ledge is removed. Mayor Robert Chatfield said he hopes the project will be finished by the end of the week.
Motorists should expect delays, he said.
The 100-foot strip of rock impedes the flow of traffic on Plank Road, Chatfield said. The goal of the project is to widen that section of the road.