Im about to do some retaining wall work for a home organization. The ditch is 300 feet long exactly and has about 2 to 3 feet high walls and 2 sides. So total wall area is 1200 sq feet give or take. What i plan to do is remove all the ties dig in a little and set a 6 inch gravel base. Ill put up the new 6x6x8 ties with deadmans and lay down fabric behind the wall with 4 in perforated pipe and fill in the back with gravel. The ditch itself need to be shaped up a bit and there is a flower bed that is collapsing in the ditch. I quote by a guy was 30000 and another was 20000. I figured my costs to be this: 200 ties: $3500 Gravel #57: A lot of yards. Need some feed back on how much. Pipe and Fabric: $500 Labor: 100 hours? $18000 quote I have done ties before and they are easy to work with for me but not on this scale. I think 18000 is a solid quote i have to factor in equipment and gas but what do you think?