1. (1) The following systems, sites, and/or conditions shall require advanced treatment:

   1. (a) Any system with a design flow of over 4,000 gpd of sewage.

   2. (b) Any system that is producing high strength sewage of over 1,800 gpd shall treat to secondary effluent standards under a Performance Permit. If the average strength is 3,000 mg/1 Biological Oxygen Demand (BOD) or greater, ADPH may consider treating to primary effluent standards under a Performance Permit if:

      1. 1. There are no environmental or health ramifications.
      2. 2. The field shall be sized in accordance with 420-3-1-.55 Gravel Field Standard EDF Sizing for Establishments except that the treated BOD loading shall be used.
   3. (c) Sites where depth to ASHES from the natural ground surface is less than 6 inches.
   4. (d) Sites where depth from natural ground surface to hard bedrock is less than 12 inches.
   5. (e) Soils with an estimated or actual percolation rate of less than 5 MPI.
   6. (f) Soils where the estimated or actual percolation rate is greater than 240 MPI.
   7. (g) Sites containing mine spoil at the natural ground surface to a depth of at least 48 inches within the proposed EDF area at the time of the site evaluation.
   8. (h) When a pad or bed is used as described in 420-3-1-.59 Pad and Bed Construction Specifications.
   9. (i) When drip irrigation is used as described in 420-3-1-.62 Drip Irrigation Requirements.

Author: Thad Pittman, Matthew Conner, Ken Stephens, Bob Bright

Statutory Authority: Code of Ala. 1975, §§22-2-2(4); 22-2-2(6); 22-10-1, et seq.; 22-26-1, et seq.

Editor’s Note: Previous Rule .36 was renumbered .25 per certification published December 30, 2022; effective February 13, 2023.

History: New Rule: Filed January 19, 2017; effective March 5, 2017. Repealed and New Rule: Published December 30, 2022; effective February 13, 2023.