Okla. Admin. Code § 252:641-9-1 - General provisions
(a)
Primary settling. All sewage entering a pump tank (i.e., a lift station or a flow equalization tank) must first pass through a septic tank or a trash tank for primary settling.
(b)
Pump tank design and construction. Pump tanks shall:
(1) be constructed to prevent sewage from leaking out of the tank and to prevent the infiltration of water into the tank;
(2) when made of concrete, meet the requirements of 252:641-7-2(a);
(3) have no more than one inch (1) variation in elevation from side to side and end to end;
(4) have a manhole opening of at least twenty inches (20") in diameter or, if rectangular, having no side less than twenty inches (20") in length. The manhole cover shall have a lock, locking bolt, or some type of tamper-resistant fastener, or require tools for removal. The manhole opening shall extend a minimum of two inches (2") above ground elevation and shall use a riser safety screen system;
(5) have a threaded union installed in the discharge line located within eighteen inches (18") of the manhole opening so that the pump can be removed without entering the pump tank; and
(6) have a check valve installed in the discharge line after the threaded union. The check valve shall be the same diameter as the discharge line.
(c)
Pump design. Pumps shall be:
(1) designed to pump sewage or other liquid containing fine particles/suspended solids; and
(2) rated to pump at least the average daily flow the required distance and elevation.
(d)
Prevention of back siphoning. Pump discharges shall flow through a structure or device that prevents the back siphoning of wastewater to the pump tank.
(e)
Example. Appendix J illustrates the requirements for a pump tank.
Notes
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