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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.
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.
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.
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