N.J. Admin. Code § 7:22-4.35 - Infiltration/inflow for wastewater treatment facilities

(a) An infiltration/inflow analysis is required for sanitary sewer rehabilitation projects as part of the Project Report/Facilities Plan.

(b) The applicant shall demonstrate to the Department's satisfaction that each sewer system discharging into the wastewater treatment facility is not or will not be subject to excessive infiltration/inflow. For combined sewer overflow projects, in no case shall inflow be considered excessive.

(c) If the rainfall induced peak inflow rate results or will result in chronic operational problems or system surcharging during storm events or the rainfall induced total flow rate exceeds 275 gallons per capita per day during storm events, the applicant shall perform a sewer system evaluation survey including a cost effectiveness analysis to determine the quantity of excessive inflow and shall propose a rehabilitation program to eliminate the excessive inflow.

(d) If the flow rate at the existing wastewater treatment facility is less than 120 gallons per capita per day during periods of high groundwater, the applicant shall design the project including sufficient capacity to transport and treat any existing infiltration. If the applicant demonstrates that its sewer system is subject to excessive infiltration of 120 gallons per capita per day or more during periods of high groundwater, the applicant shall perform a sewer system evaluation survey including a cost effectiveness analysis and shall propose a rehabilitation program to eliminate the excessive infiltration.

(e) The provisions of (a) through (d) above are not intended to apply to stormwater runoff collection systems. However, a similar analysis regarding the quality and quantity of infiltration/inflow into a stormwater runoff collection system may be required.

Notes

N.J. Admin. Code § 7:22-4.35

Amended by R.1992 d.42, effective 1/21/1992.
See: 23 New Jersey Register 3282(a), 24 New Jersey Register 246(a).
Amended to reflect that an infiltration/inflow analysis is required for all wastewater treatment facilities project, and to clarify that the capacity necessary to transport and treat existing infiltration where wastewater flow rates of less than 120 gallons per capita per day during periods of high groundwater are involved must be used as a basis for design by the local government unit and identified that an infiltration/inflow analysis may be required for stormwater management facilities projects.
Amended by R.1998 d.407, effective 8/3/1998.
See: 30 New Jersey Register 1144(a), 30 New Jersey Register 2863(a).
In (a), inserted "for sanitary sewer rehabilitation projects".