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depending on the situation, I will set up concrete forms if possible and screed off of them with some aluminum rails. It doesn't take that long and I use a laser level to set my pitch. Once I set up I just start bringing in my base material and compacting it in lifts. As I get closer to final grade I will double check my rails and to fill in any minor areas( small depressions less then 1/4") I will use the same base material but I will remove the larger 3/4" stone and it makes getting the base material completely level much easier. I have found that on walkways and smaller patios that when I am finished and I go back and check to make sure that everything is as it should be, I have a perfrectly flat surface ready for pavers. I don't have any defects in any direction and with proper compaction, proper depth, and all else that goes with the work. I couldn't ask for a better surface and I find that the string lines require a little more tweeking at the end to get good results. It also makes it easier for someone else to level the base material after you verify the correct dimensions and height.
Walter
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