I'm working on a bid for a retaining wall that I would like some help with. The wall is 110 feet long and 7 feet high. It is being built on a 30 degree sloped yard to flatten out the yard. So the fill is going to be from nothing to 7 feet deep and 25 feet wide by 110 feet long. I have the material figured and how much fill there will be ,but I'm struggling with the labor part. I've got it figured at approx $21000 in total material. Any help in what to bid is appreciated.