Safety Ledge - Need Measurements Now!

The Shotcreters are HERE and PB just asked me for measurements on the safety ledge. I gave him the measurements a month ago a can't remember them so thought I would put this out and see if I can get a quick response from some of you with experience. 3 inches? 4 inches? and how far below the waterline? 48 inches? I am just going to have it on the two sides of the deep that don't have the bench, right? Appreciate it! (And surely would love to know the best robotic to catch the dirt on it too)
 
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