Solid waste collection in the City shall be done only by collectors licensed by the City. Nothing in this chapter shall be construed to prevent the owner from transporting solid waste accumulating upon premises owned, occupied, or used by said owner, provided that such solid waste is disposed of properly in an approved landfill. No license is required for the removal, hauling or disposal of dirt, gravel and rock from grading or excavation; however, all such material shall be hauled in vehicles so constructed and maintained so that none of the dirt, gravel, and rock spills on the public roads or right-of-way.