1. (a) Primary settling. All sewage entering a pump tank (i.e., a lift station or a flow equalization tank) must firstpass through a septic tank or a trash tank for primary settling.

2. (b) Pump tank design and construction. Pump tanks shall:

   1. (1) be constructed to prevent sewage from leaking out of the tank and to prevent the infiltration of water into the tank;
   2. (2) when made of concrete, meet the requirements of 252:641-7-2(a);
   3. (3) have no more than one inch (1) variation in elevation from side to side and end to end;
   4. (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. (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. (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.

3. (c) Pump design. Pumps shall be:

   1. (1) designed to pump sewage or other liquid containing fine particles/suspended solids; and
   2. (2) rated to pump at least the average daily flow the required distance and elevation.
4. (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.
5. (e) Example. Appendix J illustrates the requirements for a pump tank.

Added at 16 Ok Reg 1895, eff 6-11-99

Amended at 21 Ok Reg 1618, eff 6-11-04

Amended at 25 Ok Reg 2318, eff 7-11-08

Amended at 37 Ok Reg 1296, eff 9-15-20

Amended at 41 Ok Reg, Number 23, effective 9-15-24