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Total nitrogen reduction (N.J.A.C. 7:50-6.84(a)6iv(6))
The Township land use ordinance and the CMP require that stormwater management measures be designed to achieve a minimum of 65 percent reduction of the post-development total nitrogen load from the developed site, including those permanent lawn or turf areas that are specifically intended for active human use, in stormwater runoff generated from the water quality design storm. The development has not been designed to meet this standard. Note that this requirement must be met for the entire development and not just the lawn and landscaped areas.
The Township land use ordinance and the CMP require that stormwater infiltration facilities be sited in suitable soils verified by field testing to have permeability rates between one and twenty inches per hour. The submitted information indicates that all proposed stormwater management measures will be located in soils having a permeability rate greater than twenty inches per hour. This issue may be resolved by removing soils below each BMP and replacing those soils with a three-foot layer of soil having an acceptable permeability rate (such as a K3 or K4 soil). Any replacement soils must also be replaced up to the elevation of the lowest outfall within each BMP.
These inconsistencies should be addressed by the applicant.