Just started plan review for an upcoming major project at one of our water utility treatment plants. Two (2) pages of details on the duct banks, some with burial depths of 56" to top of concrete. Details, details, details, which I will 'review' in the next week or so. It is a substantially large project, 350+ page plan set. Funny how the duct bank jumped out as I moved the plan set to my drafting table Saturday afternoon.