Authority: IC 16-19-3-4

Affected: IC 16-19-3-4

Sec. 72. (a) On-site sewage system feasibility, location, selection, and design shall be based on the:

1. (1) site evaluation;
2. (2) information obtained from the on-site soils evaluation; and
3. (3) DDF.

(b) Elevated sand mound on-site sewage systems may be constructed if the following site conditions are met:

1. (1) Sufficient area exists on the lot for an appropriately sized elevated sand mound on-site sewage system, while meeting the:

   1. (A) separation distances of section 57 of this rule; and
   2. (B) dispersal area requirements of section 58 of this rule.
2. (2) The topographic position of the site on which the elevated sand mound on-site sewage system is to be built is convex, hill slope, or flat. If surface and subsurface drainage can be diverted around the site, a toe slope position can be utilized.
3. (3) The site on which the elevated sand mound on-site sewage system is to be built has a slope of six percent (6%) or less.
4. (4) Site conditions permit any seasonal high water table at the site of the proposed elevated sand mound on-site sewage system to be lowered to at least twenty (20) inches below original grade, in accordance with section 59 of this rule.

5. (5) When no soil horizon from the ground surface to twenty (20) inches below the ground surface in a soil developed from Wisconsin glacial till shows effervescence when treated with a ten percent (10%) hydrochloric acid solution, unless:

   1. (A) the on-site soils evaluation report shows that the presence of the horizon is not detrimental to the proper functioning of an on-site sewage system; and
   2. (B) the determination in clause (A) is made using the guidelines as set forth in the soil manuals, technical bulletins, and handbooks of the NRCS guidelines and as approved by the department.

6. (6) When there are no soil horizons from the ground surface to twenty (20) inches below the ground surface with:

   1. (A) less than twenty percent (20%) clay by volume and greater than thirty-five percent (35%) coarse fragments by volume; or
   2. (B) greater than or equal to twenty percent (20%) clay by volume and greater than sixty percent (60%) coarse fragments by volume.

7. (7) All soil horizons from the original grade to twenty (20) inches below the original grade have a soil loading rate of not less than twenty-five hundredths (0.25) gallons per day per square foot and not more than one and twenty-hundredths (1.20) gallons per day per square foot as determined from Table V as follows:

   Table V - Soil Loading Rates for Elevated Sand Mound On-Site Sewage Systems (in gpd/ft2)
   SOIL STRUCTURE CLASSES
   SOIL TEXTURE CLASSES	Single Grain	Granular	Strong: Angular, Sub-Angular Blocky, Prismatic	Moderate: Angular, Sub-Angular Blocky, Prismatic	Weak: Angular, Sub-Angular Blocky, Prismatic; Platy1	Fragic Characteristics: Very Coarse Prismatic	Structureless, Massive, Friable, V. Friable	Structureless, Massive, Compact, Firm, V. Firm; Platy2
   Gravel, Coarse Sand	1.20	N/A	N/A	N/A	N/A	N/A	N/A	N/A
   Loamy Coarse Sand, Medium Sand	1.20	1.20	N/A	N/A	1.20	N/A	N/A	N/A
   Fine Sand, Loamy Sand, Loamy Fine Sand	0.60	0.60	N/A	0.60	0.60	N/A	0.60	N/A
   Very Fine Sand, Loamy V. Fine Sand	0.50	0.50	N/A	0.50	0.50	N/A	0.50	N/A
   Sandy Loam, Coarse Sandy Loam	N/A	0.60	N/A	0.60	0.60	0.00	0.60	0.00
   Fine Sandy Loam, V. Fine Sandy Loam	N/A	0.60	N/A	0.60	0.60	0.00	0.60	0.00
   Loam	N/A	0.50	0.50	0.50	0.50	0.00	0.50	0.00
   Silt Loam, Silt	N/A	0.50	0.50	0.50	0.50	0.00	0.50	0.00
   Sandy Clay Loam	N/A	0.50	0.50	0.50	0.50	0.00	0.50	0.00
   Silty Clay Loam, Clay Loam, Sandy Clay	N/A	0.25	0.25	0.25	0.25	0.00	0.25	0.00
   Silty Clay, Clay	N/A	0.25	0.25	0.25	0.25	N/A	0.25	0.00
   Organic Soil Materials	N/A	N/A	N/A	N/A	N/A	N/A	0.00	N/A
   Limnic Soil Materials	N/A	N/A	N/A	N/A	N/A	N/A	N/A	0.00
   Bedrock	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A
   N/A NOT APPLICABLE
   1 Naturally occurring platy structure.
   2 Platy structure caused by compaction has a soil loading rate of 0.00 gpd/ft2 unless broken up by methods approved by the department.

(c) Elevated sand mound soil absorption systems shall not be constructed as follows:

1. (1) In areas where surface runoff or subsurface drainage will have an adverse effect on the on-site sewage system, unless the surface runoff or subsurface drainage can be effectively diverted around the system.
2. (2) Where the original grade is below the RFE.
3. (3) In areas subject to ponding.
4. (4) Wholly or partly located in a drainage way.
5. (5) Where compacted soil material is identified in the soil at a depth greater than twelve (12) inches, unless the compaction is broken up by a method approved by the department.

(Indiana Department of Health; 410 IAC 6-8.3-72; filed Oct 19, 2012, 2:06 p.m.: 20121114-IR-410120156FRA; readopted filed Sep 26, 2018, 2:48 p.m.: 20181024-IR-410180328RFA; readopted filed Nov 14, 2024, 1:24 p.m.: 20241211-IR-410230798RFA)