ZB 22 13 2023 03 Drainage Statement

I. Drainage Statement This Drainage Statement has been prepared to define and analyze the stormwater drainage conditions that would occur as a result of the improvements to Block 153, Lot 38, as shown on the Township of West Orange Tax Map Sheet No. 84, located in the Township of West Orange, Essex County, New Jersey. In existing conditions, the subject site consists of 0.94 acres (40,971 SF) and is located at 470 Eagle Rock Avenue. Under existing conditions, the site is developed as a restaurant with associated parking, landscaping and lighting. The existing development has an impervious coverage of 88.3% (36,177 SF) and is located in the B-2 – General Business Zone. The proposed development consists of the demolition of the existing restaurant and the construction of a 2,525 SF Popeyes restaurant with a drive-thru and a 1,616 SF Sonic restaurant with a drive-thru. Additional site amenities include parking, landscaping, lighting and a trash enclosures. As a result of the proposed development, a portion of the previously vacated Fundus Road right-of-way will be incorporated within Lot 38, bringing the total lot area to 1.05 AC (45,713 SF). The proposed development will result in a total impervious coverage of 69.4% (31,732 SF). The stormwater analysis has been conducted to include the vacated Fundus Road right-of-way in both existing and proposed conditions. This results in an existing impervious coverage of approximately 80.5% (36,782 SF). Therefore, the proposed development will result in a decrease in impervious coverage of approximately 11.1% (5,050 SF) and a decrease in motor vehicle surface area of approximately 4,600 SF. In addition, per the Natural Resources Conservation Service Web Soil Survey, a portion of the property is located within unclassified Urban Land soil. To be conservative, the analysis utilized HSG B in existing conditions and HSG D in proposed. Based upon the fact that the proposed improvements will result in more than one (1) acre of land disturbance, this project is classified as a “major development” and is subject to compliance with the Stormwater Regulations set forth in NJAC 7:8. However, the proposed project is reducing motor vehicle surface area and impervious coverage from existing to proposed conditions. As such, per NJAC 7:8-5.5, the project is not required to meet the stormwater runoff quality standards as the

g motor vehicle surface area and impervious coverage from existing to proposed conditions. As such, per NJAC 7:8-5.5, the project is not required to meet the stormwater runoff quality standards as the motor vehicle surface area onsite will not be increased by more than ¼ acre from existing to proposed conditions. As a result, the site has been designed to meet the stormwater runoff quantity and groundwater recharge standards set forth by the Township of West Orange Land Development Ordinance and NJAC 7:8. Per NJAC 7:8- 5.6(b).1, the stormwater runoff quantity requirements are met through demonstration that the post- construction runoff hydrographs for the 2, 10- and 100-year storm events do not exceed at any point in time, the pre-construction runoff hydrographs for the same storm events. Per NJAC 7:8-5.4(b).1.i, the groundwater recharge requirements are met through demonstration that greater than one hundred (100) percent of the average annual pre-construction groundwater recharge volume for the site is being maintained, due to the reduction in impervious coverage as a result of the proposed development. Orange Dev, LLC October 2022 DEC# 1021-99-025 3 Last Revised March 2023