I just had a long reach excavator at my place for 3 days digging out a bunch of shallow areas. The thing could reach out 60'. With a little dirt pushed up here and there he was able to reach ALL of the shallow areas I wanted gone. I was thinking about using him for 4 days but he got more done in 3 days than I was hoping to do total. I do have the advantage that letting the sludge sit for a year before we move it is not a problem. The price for all this was fairly reasonable to me.
