18-29-711.4 Offsets below lowest branch.

   Where a vertical offset occurs in a soil or waste stack below the lowest horizontal branch, change in diameter of the stack because of the offset shall not be required. If a horizontal offset occurs in a soil or waste stack below the lowest horizontal branch, the required diameter of the offset and the stack below it shall be determined as for a building drain in accordance with Table 18-29-710A.

18-29-712 Sumps and Ejectors.

18-29-712.1 Building drains below sewer.

   Building drains that cannot be discharged to the sewer by gravity flow shall be discharged into a tightly covered and vented sump, from which stack the liquid shall be lifted and discharged into the building gravity drainage system by automatic pumping equipment or other approved method.

18-29-712.2 Check and gate valve required.

   A gate valve located on the discharge side of the check valve shall be installed in the pump or ejector discharge piping between the pump or ejector and the gravity drainage system. Access shall be provided to such valves. Such valves shall be located above the sump cover required by Section 18-29-712.1 or, when the discharge pipe from the ejector is below grade, the valves shall be accessibly located outside the sump below grade in an access pit with a removable access cover.

   Exception: In single family residential buildings, only a check valve shall be required, located on the discharge piping from the sewage pump or ejector.

18-29-712.3 Sump design.

   The sump pump, pit and discharge piping shall conform to the requirements of Sections 18-29-712.3.1 through 18-29-712.3.5.

18-29-712.3.1 Sump pump.

   The sump pump capacity and head shall be appropriate to anticipated use requirements.

18-29-712.3.2 Sump pit.

   The sump pit shall be not less than 18 inches (457 mm) in diameter and 30 inches (762 mm) deep, unless otherwise approved. The pit shall be accessible and located such that all drainage flows into the pit by gravity. An approved sump pit or tank within a building receiving the discharge from sanitary drains shall be constructed of approved fiberglass, steel, cast iron, reinforced concrete pipe or other approved materials. Approved plastic or fiberglass liners may be used in conjunction with any of the approved materials referenced above. The pit bottom shall be solid and provide permanent support for the pump. The sump pit shall be fitted with a gas-tight removable cover adequate to support anticipated loads in the area of use. The sump pit receiving sanitary flow shall be vented in accordance with Article 18-29-9.

(Amend Coun. J. 3-27-02, p. 82090, § 3; Amend Coun. J. 7-29-15, p. 3537, § 4)