1. (1) Any reductions in Gravel Field Standard bottom area for a dwelling using any permitted disposal product as an alternative to the Gravel Field Standard as calculated in 420-3-1-.53 Gravel Field Standard EDF Sizing for Dwellings, shall be expressed as a percent reduction of bottom area and shall be reflected in the Product Permit.

   1. (a) The bottom area reduction from the Gravel Field Standard for advanced treatment to secondary effluent standards is found in Column VI of Table 2 or Table 3.
   2. (b) The minimum bottom area square footage calculated for the Gravel Field Standard may bereduced by 33 percent of bottom area if gravel depth is increased to 24 inches total for EDFs with percolation rates of less than 120 MPI.
   3. (c) Only one bottom area reduction may be taken per field. For example, if a reduction is taken for advanced treatment, no bottom area reduction may be taken for disposal technology used, or if a bottom area reduction is taken for depth of gravel, no bottom area reduction may be taken for advanced treatment.
   4. (d) If the system has a design flow of over 4,000 gpd, advanced treatment is required.

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 .80 was renumbered .54 per certification published December 30, 2022; effective February 13, 2023.

History: Filed July 20, 1988. Amended: Filed June 19, 1992. Repealed and New Rule: Filed December 16, 1999; effective January 20, 2000. Repealed and New Rule: October 20, 2005; effective November 24, 2005; operative March 19, 2006. Repealed and New Rule: Filed January 19, 2017; effective March 5, 2017. Repealed and New Rule: Published December 30, 2022; effective February 13, 2023.