Specifications include, but are not limited to: Wells, cisterns, cesspools, outdoor toilets, basements, cellars, septic tanks, etc., and holes and trenches resulting from demolition and removal shall be filled to ground surface. Rock materials from masonry construction may be used in the backfilling up to a depth of one foot below ground surface if sufficient fine materials are mixed therewith to fill the voids. Underground tanks are to be removed and the areas filled. Dirt shall be used for the top one foot of backfill. For rough grading, rock materials from masonry construction with a maximum dimension of nine inches may be used in all except the top one foot of the fill. provided such rock and materials are well distributed in earth. All fill material shall be free from trash, wood. pipe and debris.