N.J. Admin. Code § 7:45-8.5

Current through Register Vol. 56, No. 19, October 7, 2024

Section 7:45-8.5 - Specific recharge standards

(a) The minimum design and performance standards for groundwater recharge are as follows:

1. The design engineer shall either:

i. Demonstrate through hydrologic and hydraulic analysis that the site and its stormwater management measures maintain 100 percent of the average annual preconstruction groundwater recharge volume for the site; or

ii. Demonstrate through hydrologic and hydraulic analyses that any increase of stormwater runoff volume from pre-construction to post-construction for the two-year storm is infiltrated.

2. The groundwater recharge requirement does not apply to redevelopment projects that are subject to the following types of existing stormwater:

i. Stormwater from areas of high pollutant loading. High pollutant loading areas are areas in industrial and commercial developments where solvents and/or petroleum products are loaded/unloaded, stored, or applied, areas where pesticides are loaded/unloaded or stored; areas where hazardous materials are expected to be present in greater than "reportable quantities" as defined by the United States Environmental Protection Agency (EPA) at 40 CFR 302.4; areas where recharge would be inconsistent with Department or licensed site remediation professional approved remedial action work plans or landfill closure plans and areas with high risks for spills of toxic materials, such as gas stations and vehicle maintenance facilities; and

ii. Industrial stormwater exposed to "source material." "Source material" means any material(s) or machinery, located at an industrial facility that is directly or indirectly related to process, manufacturing or other industrial activities, that could be a source of pollutants in any industrial stormwater discharge to groundwater. Source materials include, but are not limited to, raw materials; intermediate products; final products; waste materials; by-products; industrial machinery and fuels, and lubricants, solvents, and detergents that are related to process, manufacturing, or other industrial activities that are exposed to stormwater.

3. The design engineer shall assess the hydraulic impact on the groundwater table and design the site so as to avoid all material, measurable adverse hydraulic impacts to the maximum extent possible. Potential adverse hydraulic impacts include, but are not limited to, exacerbating a naturally or seasonally high water table so as to cause surface ponding, flooding of basements, or interference with the proper operation of subsurface sewage disposal systems and other subsurface structures in the vicinity or downgradient of the groundwater recharge area.

(b) Guidance on the analyses in (a)1 above is provided in the New Jersey Stormwater Best Practices Manual for stormwater runoff and groundwater recharge calculations.

N.J. Admin. Code § 7:45-8.5

Special amendment, R.2009 d.361, effective 11/4/2009 (to expire May 4, 2011).
See: 41 N.J.R. 4467(a).
In (a)2i, inserted "or licensed site remediation professional".
Readoption of special amendment, R.2011 d.251, effective 9/8/2011.
See: 43 N.J.R. 1077(a), 43 N.J.R. 2581(b).
Provisions of R.2009 d.361, readopted without change.