Specifications include, but are not limited to: The provisions of the specifications apply to the wrecking, removal, and demolition of buildings and structures. Such work shall include: a. Remove all non-masonry materials from structures. All concrete walls, floors, footings and foundation must be removed. The excavations shall be backfilled with clean fill dirt as stated in item #6. b. Remove all foundation walls and footings on any garage. Do not remove the slab unless it is broken or specified in the bid. c. All private concrete, asphalt, crushed rock or brick driveways and sidewalks must be removed. d. Remove any and all trash, rubbish and debris. e. Remove any trees four (4) inches in diameter or less within five (5) feet from any structure. f. Grading: Sec. 43-261. Maximum permissible slope resulting from excavation. (a)Limitation. It shall be unlawful to make an excavation or fill which causes a ground slope of more than 2.5 horizontal to one vertical. (b)Exceptions. (1)Slopes whose faces are protected by retaining walls or other systems which are designed by an engineer registered in the State of Nebraska. (2)Slopes whose vertical elevation change is less than six feet. (3)Slopes which are part of an active construction project that has been properly permitted. (4)Slopes of temporary surcharge piles. (Ord. No. 33582, § 1(43-261), 6-27-95) g. Silt fence will be required where needed to prevent runoff onto sidewalks, streets and neighboring properties.