Alaska Administrative Code
Title 18 - Environmental Conservation
Chapter 72 - Wastewater Treatment and Disposal
Article 2 - Domestic Wastewater System Plan Review
18 AAC 72.265 - Soils analysis and report

Universal Citation: 18 AK Admin Code 18 AAC 72.265

Current through November 28, 2024

The soils analysis and report must meet the following criteria:

(1) the number of test holes, minimum test hole depth, and percolation tests must be sufficient to adequately evaluate subsurface characteristics of the area for the type of system proposed;

(2) soils in the usable wastewater disposal area must be shown by percolation test to have an acceptable percolation rate for the type of system proposed; percolation tests must be

(A) performed by a registered engineer, or a person under the responsible charge of a registered engineer;

(B) be performed in accordance with standard sanitary engineering principles and practices;

(C) taken in each soil stratum to be included in an infiltrative surface area; and

(D) confirmed to be accurate by a correlation of the observed soil texture in the test hole with the range of soil texture types associated with percolation rates in 18 AAC 72.530(f)(3);

(3) soil borings and soil analysis must show the location and elevation of seasonal high water table and impermeable strata in relation to the wastewater system;

(4) seasonal high water table must be determined by

(A) monitoring test holes or soil borings taken between June 1 and September 30;

(B) soil mottling analysis;

(C) interpretation of levels of standing open water;

(D) the knowledge and experience of the engineer, based on past subsurface investigative work in the vicinity of the project; or

(E) a combination of these methods;

(5) the depth to seeps, if any, must be recorded; the department may require subsequent monitoring;

(6) in areas known or suspected to contain permafrost,

(A) a soil moisture content profile analysis derived from laboratory testing methods must show the soils are adequately drained throughout the usable wastewater disposal area; and

(B) the results of a geotechnical study must show that the area can successfully be used for the system proposed and will remain stable under the proposed design; and

(7) the report must be sealed by a registered engineer.

Authority:AS 44.46.020

AS 46.03.010

AS 46.03.020

AS 46.03.050

AS 46.03.100

AS 46.03.110

Disclaimer: These regulations may not be the most recent version. Alaska may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
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