They have been installing the mainline down four all this week. They wrapped around 5 tee's and headed down the tree line on four. They have to use a much bigger machine than on five because they are installing much bigger pipe. They went from 4" to 8" about half way down the fairway. They will connect the mainline on 4 to the pump stations discharge pipe. They also did the main line that goes directly across the fairway on 4 to the front tee on three. I have added some pictures with descriptions.