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Alabama Administrative Code
Title 420 - ALABAMA STATE BOARD OF HEALTHChapter 420-3-1 - ONSITE SEWAGE TREATMENT AND DISPOSAL
Design And Construction Requirements
Section 420-3-1-.57 - Shallow Placement Systems

Ala. Admin. Code r. 420-3-1-.57

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Current through Register Vol. 43, No. 1, October 31, 2024
Section 420-3-1-.57 - Shallow Placement Systems
(1) The shallow placement of an EDF may be utilized to overcome soil and site limitations. Except as provided in this rule, the requirements for the design and installation of a shallow placement EDF shall be the same as for other OSSs.
(2) Shallow trenches may be used under the following conditions:
(a) A gravel trench shall be a minimum of 12 inches into the natural ground surface. The minimum depth for other permitted products shall be as shown in the Product Permit. The aggregate sidewalls or top of the EDF product shall be at or below the natural ground surface.
(b) The permeability rate is based on the least permeable soil horizon within 24 inches of the ground surface, or to a depth of 18 inches below the trench bottom, whichever is deeper.
(c) The soil cover shall be a minimum 12-inch depth over the aggregate or EDF product. If in-situ soil is not used for soil cover, the fill material shall be placed prior to installation at a uniform depth over the entire EDF. The soil cover shall extend laterally 3 feet beyond any outermost EDF side or end wall before the maximum side slope of 3:1 begins.
(d) Soil used as cover shall be topsoil that will support appropriate cover vegetation. It shall be a mineral soil material. preferably loose or friable, but not excessively sticky or plastic. It shall be relatively free of debris and coarse fragments larger than gravel size. Content of gravel shall not exceed 35 percent by volume. Textures may range from Groups 1 through 4A. Texture Groups 4B and 4C shall not be used. Care shall be taken to prevent compaction.

Ala. Admin. Code r. 420-3-1-.57

New Rule: Filed October 20, 2005; effective November 24, 2005; operative March 19, 2006. Amended: Filed October 19, 2006; effective November 23, 2006.
Adopted by Alabama Administrative Monthly Volume XXXV, Issue No. 04, January 31, 2017, eff. 3/5/2017.
Adopted by Alabama Administrative Monthly Volume XLI, Issue No. 03, December 30, 2022, eff. 2/13/2023.

Previous Rule .96 was renumbered .57 per certification published December 30, 2022; effective February 13, 2023.

Author: Thad Pittman, David Gray, John Clement, Boyd Rogers, 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.; 22-26-1et seq.