2918-25 STORMWATER final 4_1_25.doc.pdf

20 Small-scale Infiltration Basin 2.5 acres Small-scale Sand Filter 2.5 acres 3. To satisfy the stormwater runoff quantity standards at§ 25-29.4S, the design engineer shall utilize BMPs from Table 1 or from Table 2 and/or an alternative stormwater management measure approved in accordance with§ 25-29.4H . 4. If a variance in accordance with N.J.A.C. 7:8-4.6 or a waiver from strict compliance in accordance with § 25-29.4E is granted from the requirements of this subsection, then BMPs from Table 1, 2, or 3, and/or an alternative stormwater management measure approved in accordance with § 25-29.4H may be used to meet the groundwater recharge, stormwater runoff quality, and stormwater runoff quantity standards at § 25-29.4Q, R and S. 5. For separate or combined storm sewer improvement projects, such as sewer separation, undertaken by a government agency or public utility (for example, a sewerage company), the requirements of this subsection shall only apply to areas owned in fee simple by the government agency or utility, and areas within a right- of-way or easement held or controlled by the government agency or utility; the entity shall not be required to obtain additional property or property rights to fully satisfy the requirements of this subsection. Regardless of the amount of area of a separate or combined storm sewer improvement project subject to the green infrastructure requirements of this subsection, each project shall fully comply with the applicable groundwater recharge, stormwater runoff quality control, and stormwater runoff quantity standards at § 25-29.Q, R, and S, unless the project is granted a waiver from strict compliance in accordance with§ 25-29.4E . Q. Groundwater Recharge Standards 1. This subsection contains the minimum design and performance standards for groundwater recharge as follows: 2. The design engineer shall, using the assumptions and factors for stormwater runoff and groundwater recharge calculations at § 25-29.5, either: i. Demonstrate through hydrologic and hydraulic analysis that the site and its stormwater management measures maintain 100 percent of the average annual pre-construction groundwater recharge volume for the site; or ii. Demonstrate through hydrologic and hydraulic analysis that the increase of stormwater runoff volume from pre-construction to post-construction for the projected 2-year storm, as defined and

te; or ii. Demonstrate through hydrologic and hydraulic analysis that the increase of stormwater runoff volume from pre-construction to post-construction for the projected 2-year storm, as defined and determined pursuant to § 25-29.5D of this ordinance is infiltrated. 3. This groundwater recharge requirement does not apply to areas of the project that have been previously developed as defined in § 25-29.2 or to groundwater subject to projects within the “urban redevelopment area,” or to projects subject to 25-29. Q-4 below. However, groundwater that is not subject to 4 below shall be used to achieve the standards of this section to the maximum