Statutes, codes, and regulations
Alabama Administrative Code
Title 420 - ALABAMA STATE BOARD OF HEALTHChapter 420-3-1 - ONSITE SEWAGE TREATMENT AND DISPOSAL
Site Evaluation
Section 420-3-1-.41 - Minimum Testing Standards And Interpretations

Ala. Admin. Code r. 420-3-1-.41

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Current through Register Vol. 43, No. 1, October 31, 2024
Section 420-3-1-.41 - Minimum Testing Standards And Interpretations
(1) See Table 19 for the minimum number of tests required per site.
(2) Soil tests shall be in the proposed EDF or discharge area, and in the proposed REDF when required, except for soµ mapping which shall be performed in accordance with 420-3-1-.49 Soil Maps. The method by which each test is located shall be specified.
(3) Multiple testing locations for the same area shall be a minimum of 30 feet apart and shall be evenly spaced to represent the EDF or discharge area. Each boring and its respective percolation hole shall be 5 to 15 feet apart.
(4) When two tests are performed in the EDF and they produce significantly different results (more than 20 MPI or the extreme of another soil group), one of the following shall be done:
(a) Relocate the proposed EDF area and retest or reevaluate as necessary to confirm that the site is consistent.
(b) Calculate the amount of EDF using the highest result(s).
(c) Soil evaluators may average the test results on projects where four soil tests have been conducted. The averaged test results can be representative of the site conditions.
(5) Soil evaluators may average the restriction depth of test results on sites containing soft bedrock where four or more tests have been conducted.
(6) Observation pits are required for evaluating Large-Flow Systems, including Large-Flow Developments with an individual OSS, except where high intensity soil maps are provided.
(a) Boring diameters for soil maps shall be no less than 2.5 inches in diameter.

Ala. Admin. Code r. 420-3-1-.41

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 Repealed and New Rule: Filed December 16, 1999; effective January 20, 2000. Repealed and New Rule: October 20, 2005; effective November 24, 2005; operative March 19, 2006.
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 .65 was renumbered .41 per certification published December 30, 2022; effective February 13, 2023.

Author: David Gray

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