We are doing a commercial install and need to remove some fill dirt. 3 inches of dirt to be exact and in a six foot wide area. The perimeter of the property will have a mulch bed that surrounds the property. The builder filled the bed all the way to flush with the curb. So we need to remove 3 inches to replace with mulch. There are some rocks we need to remove as well. My question is what machine would make the most sense to rent for the job? Bearing in mind there's only 6 feet width between the parking lot and the retaining wall. Any help is greatly appreciated.