R 323.2236 Rapid infiltration.

Rule 2236.(1) Rapid infiltration is the application of wastewater to areas of moderately to highly permeable soil. The majority of applied wastewater percolates through the soil, and the treated effluent drains naturally to groundwater. The effluent is minimally treated as it travels through the soil matrix. Vegetation is not typically a part of the overall treatment process. The utilization of vegetation or its presence within a discharge area typically does not interfere with system performance. A facility utilizing rapid infiltration systems for the land treatment of wastewater shall design and construct the system under this rule. (2) The system shall consist of 2 or more cells or absorption areas that can be alternately loaded and rested or consist of 1 cell or absorption area preceded by an effluent storage or stabilization pond system. If only 1 cell or absorption area is provided, then the storage or stabilization pond shall be operated on a fill and draw basis and have sufficient capacity to allow intermittent loading of the cell or absorption area. (3) For a system that has more than 1 cell or absorption area, an individual cell or absorption area of the system shall be capable of being taken out of service without disrupting application to other cells or absorption areas of the system. (4) An appropriate hydraulic loading cycle shall be developed and implemented to maximize long-term infiltration rates and allow for periodic maintenance.