1. (a) Location. All spray irrigation fields shall:

   1. (1) be preceded by an aerobic treatment unit;
   2. (2) be located in the identified dispersal site, when a soil profile test is used to size the irrigation field;
   3. (3) utilize at least two sprinkler heads to disperse the treated effluent; and
   4. (4) be vegetated and landscaped, and/or terraced to prevent runoff.
2. (b) Sizing. The spray irrigation field shall be sized according to Appendix H, Figures 14-19. When calculating the overall area of the spray irrigation field, areas of overlap may only be counted once.

3. (c) Sprinklers. The sprinklers shall be designed to:

   1. (1) provide uniform distribution of treated effluent over the entire spray irrigation field without misting; and
   2. (2) have a trajectory of no more than fifteen-degrees (15°) to keep the spray stream low to the ground surface.

4. (d) Spray irrigation. The spray irrigation shall be:

   1. (1) adjusted and maintained at a rate to prevent runoff; and
   2. (2) controlled by a timing device to take place daily between 1:00 a.m. and 6:00 a.m.

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

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

Amended at 38 Ok Reg 1839, eff 9-15-21