Section 410IAC6-8.3-63. Septic tanks and dosing tanks: installation and maintenance

   (a) Septic tanks and dosing tanks shall be installed level on:

(1) undisturbed soil;

(2) sand;

(3) aggregate not larger than one and one-half (1 1/2) inches in diameter; or

(4) an engineered base.

  (b) All drain holes in septic tanks and dosing tanks shall be:

(1) fitted with a threaded fitting, cast in place, and plugged with a threaded plug; or

(2) plugged with an expandable pipe plug with a wing nut.

  (c) When the top of the septic tank or dosing tank is installed at or above grade, all access openings shall be fitted with watertight, securely fastened covers.

  (d) When the top of the septic tank or dosing tank is installed below grade, risers shall:

(1) be installed over access openings used for pumping and for maintenance of the outlet filter in the septic tank;

(2) be large enough for access to the tank through the access opening in the top of the septic tank or dosing tank to clean the tanks and to maintain floats, sensors, filters, and pumps;

(3) have the lower section sealed to the top of the tank with butyl sealant meeting ASTM C 990-09 to provide a watertight seal, if the riser assembly is not cast into the tank lid;

(4) have joints between riser sections sealed in accordance with the manufacturer's instructions so as to be watertight;

(5) extend to or above final grade;

(6) be fitted with a watertight cover securely fastened to the riser; and

(7) comply with the requirements of IC 16-41-25-3.

  (e) Septic tanks and dosing tanks shall not be installed with the top of the riser below the RFE.

  (f) All joints in the sewer connecting septic tanks in series or septic tanks to dosing tanks shall be sealed in accordance with the manufacturer's instructions in order to be watertight and to withstand the pressures exerted on them. (Indiana State Department of Health; 410 IAC 6-8.3-63; filed Oct 19, 2012, 2:06 p.m.: 20121114-IR-410120156FRA)