(A) (1) Minimum permitted cover in inches over outside top of pipe bell to top of “backfill” or to existing ground at time of sewer installation, whichever is lower, shall be no less than three feet.
(2) Cover requirements for other pipe materials and sizes will be based on their strength characteristics as approved by the Engineer.
(B) Special pipe cover shall be used when total cover over main or trunk sewers is less than three feet and may be required when total cover will not be placed immediately after pipe installations, or when other special conditions exist.
(1) Two to three feet of cover shall require the use of C-900 or shall require concrete encasement of pipes of material other then C-900.
(2) Less than two feet of cover requires special design subject of the approval of the engineer.
(3) Special pipe cover requirements through cultivated or landscaped areas shall be modified by replacing the upper six inches of excavation material with topsoil.
(Ord. 2019-02, passed 4-25-2019)