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 Indiana Administrative Code (Last Updated: December 20, 2016)
 Title 410. INDIANA STATE DEPARTMENT OF HEALTH
 Article 410IAC6. SANITARY ENGINEERING
 Rule 410IAC6-10.1. Commercial On-Site Sewage Systems

  Section 410IAC6-10.1-89. Elevated sand mound on-site sewage systems: dimensions of the elevated sand mound  

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  •    (a) Numerical dimensions for the soil material cover from the edge of the basal area to the edge of the elevated sand mound are based on a final grade of three-to-one (3:1) (on level sites). The plan views and numerical dimensions are for a simple slope (a slope that forms a plane). Elevated sand mounds sited on complex slopes are more difficult to design and construct on contour.

      (b) The minimum length of an elevated sand mound shall be the sum of the following:

    (1) The length of the aggregate bed (ABL).

    (2) Plus fourteen (14) feet, representing the two sideslopes of INDOT Specification 23 sand at both ends of the aggregate bed (including the one (1) foot level borders). A minimum endslope grade of three-to-one (3:1) shall be maintained on the INDOT Specification 23 sand.

    (3) Plus six (6) feet, representing the soil material cover at both ends of the aggregate bed. A minimum endslope grade of three-to-one (3:1) shall be maintained on the soil cover material.

      (c) The minimum width of the elevated sand mound shall be determined from the following:

    (1) On sites with slopes one-half percent (1/2%) or less, the minimum width of an elevated sand mound is the sum of the following:

    (A) The basal area width (BAW) as determined in section 88(c)(3) of this rule.

    (B) Plus six (6) feet, representing the soil material cover on both sides of the aggregate bed.

    (2) On sites with slopes greater than one-half percent (1/2%) and less than or equal to six percent (6%), the minimum width of an elevated sand mound shall be the sum of the following:

    (A) The basal area width (BAW) as determined in section 88(c)(3) of this rule.

    (B) Plus seven (7) feet, representing the sideslope of INDOT Specification 23 sand on the upslope side of the aggregate bed (including the one (1) foot level border), and shall maintain a minimum sideslope grade of three-to-one (3:1).

    (C) Plus six (6) feet, representing the soil material cover on both sides of the aggregate bed. A minimum sideslope grade of three-to-one (3:1) shall be maintained on the soil cover material.

    (Indiana State Department of Health; 410 IAC 6-10.1-89; filed Oct 19, 2012, 2:07 p.m.: 20121114-IR-410120157FRA)