Abandonment of existing District facilities shall be performed by contractors engaged with the District through a contract or permit.
(A) Main sewers. Main sewer pipe that is required to be abandoned shall be abandoned by one of the following methods:
(1) Filling with slurry. Slurry shall be a flowable mix containing a minimum of two sack cement per cubic yard; or
(2) Removing the existing pipe.
(B) Private laterals. The contractor, at his or her own expense, shall cap the lateral at the sewer main, and remove the wye for any private lateral serving a building that is to be moved or demolished.
(1) If it is noted on the improvement plans that the lateral is to be abandoned, the lateral shall be filled with slurry (as directed by the Engineer) and capped by the contractor. The sewer shall be capped with an approved coupling and a watertight cap at the main and property line (right-of-way). The wye shall be removed. This work shall be done in the presence of, and to the satisfaction of, the engineer. Alternatively, the lateral and wye connection may be removed.
(2) If it is not noted on the improvement plans, the contractor shall contact the District for abandonment requirements.
(C) Manhole.
(1) Castings and manhole body shall be removed to a minimum of three feet below final street grade or existing ground elevation, whichever is lower. The castings shall be delivered to the CAWD, as directed.
(2) Drainage holes shall be made at the bottom of the manhole, and the channel shall be sealed to a watertight condition with concrete. The manhole shall then be filled and compacted with self-compacting material, such as slurry or as approved by the engineer and city jurisdiction. Entry into “live” District manholes is prohibited but may be allowed if the contractor secures an encroachment agreement from the District.
(D) Septic tank. Every cesspool, septic tank and seepage pit that has been abandoned or otherwise has been discontinued from further use shall be abandoned as required by county and/or the city.
(E) Commercial grease interceptors.
(1) Immediately prior to abandonment, grease interceptors shall be pumped and cleaned of debris, shall have three-inch diameter holes drilled every 12 inches through the bottom of the structure to provide drainage of groundwater and shall be filled and compacted with cement slurry, or as approved by the Engineer.
(2) All existing sewer laterals shall be disconnected from grease interceptors to be abandoned. Reconnect laterals with approved couplings and pipe materials.
(Ord. 2019-02, passed 4-25-2019)