All walls, foundations, footings, supports, and masonry shall be removed to the surface elevation of adjoining ground unless otherwise specified by the City of Ashland. Concrete slabs, retaining walls, driveways, stairs, handrails, sidewalks (between street sidewalk and house), garages, outbuildings, sheds, carports, tires, tanks, pipe, wire, blacktop, etc. shall be removed unless otherwise specified by the City of Ashland. Basement walls abutting sidewalks, streets, and alleys may remain in place in order to prevent the undermining of the sidewalks, streets, and alleys. Basement or cellar floors shall be broken up sufficiently to permit proper drainage. Remaining basements shall be filled to the ground level with noncombustible materials. Construction or fill shall not be started until the area has been inspected and approved by the City of Ashland or its authorized representative. Fill material shall be Dense Graded Aggregate (DGA) and shall be free from frost, stumps, trees, roots, and muck.