The backfill over footing drains shall be pervious material (not slag), of the type, size and gradation required for the particular type of drain construction being used, and shall be carried up over drain tile but not closer than twelve inches to the established surface grade. The top twelve inches of the backfill shall consist of six inches of an impervious (clay) soil, topped with six inches of topsoil if the surface is to be covered with lawn or shrubs. If the surface adjacent to the foundation wall is to be paved or have some similar treatment, then the backfill near the top may be a suitable base for such construction.
(Ord. 1992-101. Passed 1-14-92.)