In Williamsburg–land of the big holes–big construction sites are almost a dime a dozen. Yet the big dig underway on Kent Avenue where the towers known as The Edge will rise, is more interesting than most. The stuff being dug up, and it looks like it’s going to be a heck of a job to get it out of there, are remnants of the old Eastern District Terminal Buildings that used to occupy this part of the Brooklyn waterfront. The site is said to have some, um, groundwater issues, but we’re assuming that Lake Kent is from rain rather than groundwater. Unless it stays or gets bigger as the hole gets deeper.