I have a job of removing an existing retaining wall (just placing bricks to the side) and putting it back. The foundation of the house is cracking and has to be fixed. The wall has to be removed in order to fix the foundation. These are the larger bricks (about 12" wide, 30 lb.) It is only 3 bricks tall and about 20 ft. long. There are roughly 150 bricks total. Right now I'm thinking of charging $1 per brick to remove and 2$ per brick to put back. I may charge 3$ per brick on the base. Also, the original installer placed them on just dirt. Should I put gravel on the base before I reinstall? I am new to this type of job. Please help.