Indiana Administrative Code › Title 410 - INDIANA DEPARTMENT OF HEALTH › Article 6 - SANITARY ENGINEERING › Rule 8.3 - Residential On-Site Sewage Systems › Section 8.3-73 - Table for on-site sewage system selection

Current through July 10, 2024
Authority: IC 16-19-3-4; IC 16-19-3-5
Affected: IC 16-19-3-4
Sec. 73.
On-site sewage system selection may be summarized in Table VI
				  as follows:
Table VI - Table for On-Site Sewage System
							 Selection Based on Requirements of 410 IAC 6-8.3
Site Requirements
Subsurface Trench On-Site Sewage Systems
Elevated Sand Mound On-Site Sewage Systems
							 (Sec. 72)
Gravity Flow1
							 (Sec. 70, 71)
Flood Dosing or Alt.
							 Fields1 (Sec. 70, 71)
Flood Dosing1 (Sec. 70, 71)
Pressure Dist. (Sec. 70, 71)
Slope
[LESS THAN] 15%
[LESS THAN] 15%
[LESS THAN] 15%
[LESS THAN] 15%
[LESS THAN] 6%
Design Daily Flow
>= 450
[LESS THAN] 450
Any
Any
Any
Any
Acceptable Loading Rate Range for
							 Determining System Size
>= 0.25
>= 0.25
>= 0.25
>= 0.25
>= 0.25
>= 0.25
[LESS THAN OR EQUL TO]0.75
[LESS THAN OR EQUL TO]0.75
[LESS THAN OR EQUL TO]0.75
[LESS THAN OR EQUL TO]0.75
[LESS THAN OR EQUL TO]1.20
[LESS THAN OR EQUL TO]1.20
Distance from Trench Bottom (Ground Surface for
							 Mounds) to Layer with a Soil Loading Rate [LESS THAN] 0.25
							 gpd/ft2
>= 30
>= 24
>= 24
>= 24
>= 24
>= 20
Distance from Trench Bottom (Ground Surface for
							 Mounds) to Layer with a Soil Loading Rate > 1.20
							 gpd/ft2
>= 24
>= 24
>= 24
>= 24
>= 24
>= 20
Distance from Trench Bottom (Ground Surface for
							 Mounds) to Layer with a Soil Loading Rate = 1.20
							 gpd/ft2
>= 24
>= 24
>= 24
>= 24
Press. Dist. required for SLR = 1.20
>= 0
Distance from Trench Bottom (Ground Surface for
							 Mounds) to a Soil Horizon Developed from Wisconsin Glacial Till That Shows
							 Effervescence3
>= 30
>= 24
>= 24
>= 24
>= 24
>= 20
Distance from Trench Bottom (Ground Surface for
							 Mounds) to Soil Horizon with [LESS THAN] 20% Clay and > 35% Coarse Fragments
							 by Volume
>=30
>= 24
>= 24
> 24
>= 24
> 20
Distance from Trench Bottom (Ground Surface for
							 Mounds) to Soil Horizon with > 20% Clay and > 60% Coarse Fragments by
							 Volume
>= 30
>= 24
>= 24
> 24
>= 24
>= 20
Distance from Trench Bottom (Ground Surface for
							 Mounds) to Seasonal High Water Table2
>= 24
>= 24
>= 24
>= 24
>= 24
>= 20
Total Lineal Feet of Trench
[LESS THAN OR EQUL TO]500
[LESS THAN OR EQUL TO]500
[LESS THAN OR EQUL TO]500 for Alt. Fields
Any
Any
N/A
1These conditions are also
							 suitable for subsurface trench pressure distribution on-site sewage systems.
2For subsurface trench
							 systems, if the distance from trench bottom to seasonal high water table is
							 less than twenty-four (24) inches, drainage must be installed in accordance
							 with section 59 of this rule. For elevated sand mound systems, if the depth of
							 the seasonal high water table is less than twenty (20) inches below the ground
							 surface, drainage must be installed in accordance with section 59 of this rule.
3See Sections 58(a)(2)(E),
							 70(b)(6), 71(b)(3)(B), 71(c)(3)(B), 71(d)(2)(B) and 72(b)(5).
This chart does not include considerations
							 such as the specific landscape features that must be met, the size of the soil
							 absorption system, the size of the area necessary for construction of the soil
							 absorption system on the contour with necessary setback and separation
							 distances, dispersal area, the diversion of surface drainage, the feasibility
							 of subsurface drainage, the ability to obtain easements, etc.
This chart does not take into
							 consideration the necessity to pump the effluent to overcome differences in
							 elevation (when a subsurface trench gravity system might otherwise be
							 constructed).