The site in question should be visited and the condition of the pavements noted by visual inspection. This should include, in addition to the inspection of the pavements, an examination of the existing drainage conditions and drainage structures at the site. Evidence of the adverse effects of frost action, swelling soils, reactive aggregates, etc., should also be noted. The principles set forth in Chapter 2 of this circular and in AC 150/5320-5, Surface Drainage Design, apply.