Exterior alterations to install fence retaining wall. Applicant agrees to limit height of wall at a maximum 4 feet. Walls are not permitted to be constructed along public footway with this permit unless "street dept" approval obtained. Footings for "dry-stack" type walls to follow manufacturers instructions. Footings for "traditional" type masonry walls to be 8" thick by 18" wide, minimum 30" to bottom. #4 rebar spaced 4 centers for length of wall.