(A)   Minimum requirements. Gravel shall be placed in soil treatment trenches as follows:
      (1)   Gravel depth. The depth of gravel specified below the distribution pipe shall be uniform, and of the minimum depth specified in §§ 171.100 through 171.111.
      (2)   Placement. The gravel shall be placed carefully to avoid compaction of the infiltrative surface.
      (3)   Gravel/piping. Gravel shall be placed around the distribution piping and covering the piping a minimum of two inches.
      (4)   Covering. The top of the gravel shall be covered with geotextile fabric prior to backfilling. Other approved barrier materials may be used except when geotextile fabric is specifically required in §§ 171.100 through 171.111.
(Ord. [Bd of Health Ord., Art. V], passed 11-12-1996; Ord. [Bd of Health Ord., Art. V], passed 11-12-2013)