
2018 Indiana Design and Installation Manual
47
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7.2 Subsurface Bed Design Installation Steps
15. Complete backfill with cover soil material to a minimum of 12 – 19 inches measured from the top of the 4-inch
distribution pipe. Fill must be clean, porous and able to sustain vegetation. Do not use wheeled equipment
over the system during backfill operation. A light track machine may be used with extreme caution, avoiding
crushing or shifting of pipe assembly.
16. Divert surface runoff from the system. Finish grade to prevent surface ponding. Topsoil and seed system area
to protect from erosion.
8.0 Dosing Distribution Requirements
8.0.1 ADDITIONAL REQUIREMENTS:
Dosing tanks and effluent pumps must comply with ISDH Rule 410 6-8.3
Section 62 and 65 or 410 6-10.1 Section 70 and 73 for dosing tanks and effluent pumps.
Section 410 IAC 6-8.3 (78) or 410 6-10.1 (86) Subsurface Pressure Distribution is enforced except when noted.
A design head of 3 feet is required for pressure distribution systems.
8.0.2 DOSE VOLUME:
Dose volume is calculated as follows.
Use a maximum of
3 gallons per dose per A42
module or 4 gallons per dose per B43 module
in the system. For the A42, a minimum of 1.5 gallons per dose
per module or 2 gallons per dose per B43 module.
Содержание GSF A42
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