05 Stormwater Statementrcd 10 14 24

stonefieldeng.com 92 Park Avenue, Rutherford, NJ 07030 201.340.4487 t. 201.340.4472 f. STORMWATER MANAGEMENT STATEMENT To: Township of West Orange Planning Board Project: Proposed Site Improvements Tax Block 134.02, Lots 75.03, 79 & 81 66 Franklin Avenue Township of West Orange, Essex County, New Jersey Dated: October 8, 2024 Reference: Preliminary & Final Major Site Plan (prepared by Stonefield Engineering & Design, LLC, October 8, 2024) The Applicant is proposing to maintain an existing 1,924 SF commercial building with exterior improvements. The subject property is designated as Block 134.02, Lots 75.03, 79 & 81, commonly known as 66 Franklin Avenue. The site is located within Zone B-1, Retail Business Zone in the Township of West Orange, NJ. The lot is currently bounded by an existing commercial building to the north, Franklin Avenue to the west and existing residential developments to the south and east. The proposed project area is 10,000 SF (0.23 AC) and is currently occupied by an existing commercial building with an asphalt parking lot. The project consists of the improvement of the existing structures. Additional site improvements include landscaping, and lighting. The overall disturbance area associated with the project is 10,362 SF (0.24 AC), consisting of the entire subject property, along with some proposed improvements in the right-of-way of Franklin Avenue. This Stormwater Management Statement has been prepared to analyze the potential stormwater runoff impacts of the project and measures proposed to conform to stormwater management requirements set forth by the Township of West Orange, Hudson Essex Passaic Soil Conservation District, and the New Jersey Department of Environmental Protection (NJDEP).

Stormwater Management Statement Proposed Site Improvements Township of West Orange, New Jersey October 8, 2024 PRE-DEVELOPMENT DRAINAGE CONDITIONS The existing condition of the site consists of one (1) drainage area (E-1) including the entirety of the developed lot. The site drains via overland flow to Franklin Avenue, and the southern and eastern neighboring properties, from where it is conveyed into the local stormwater system located within Chestnut Street. The following table summarizes the qualities of Drainage Area E-1 utilized in the stormwater analysis: TABLE 1: PRE-DEVELOPMENT DRAINAGE AREAS Drainage Area Description Area Extents Impervious Area Time of Concentration E-1 Pre-Development Drainage to Chestnut street 10,000 SF 8,524 SF 6 Minutes PROPOSED DRAINAGE CONDITIONS Under proposed conditions, the site is comprised of one (1) drainages area referred to as (P-1). The roof drainage of the existing building is currently conveyed to a drainage pipe, along with surface runoff captured at the southwest Corner of the property via one trench drain connected to one storm inlet on site via 6” PVC pipe, and daylights into the Franklin Avenue via one 8” PVC pipe. A portion of the site also drains to the adjacent neighboring properties. Eventually all of the stormwater on site is directed to the existing conveyance system located in Chestnut Street. TABLE 2: POST-DEVELOPMENT DRAINAGE AREAS Drainage Area Description Area Extents Impervious Area Time of Concentration P-1 Post-Development Drainage to Chestnut Street 10,000 SF 8,348 SF 6 Minutes STORMWATER MANAGEMENT ANALYSIS The project aims to disturb less than one acre of land and has reduced impervious surfaces by 176 SF and has increased motor vehicle surface by less than a 0.25 AC and therefore is not considered a Major Development as indicated by the Municipal Ordinance and New Jersey Department of Environmental Protection (NJDEP). The subject property is located within an urban redevelopment area (metropolitan planning area (PA-1)) and is therefore exempt from compaction remediation. The project is designed to conform to the stormwater management requirements set forth by the Township of West Orange, Hudson Essex Passaic County Soil Conservation District, and the NJDEP. A hydrograph comparison has been performed to evaluate the pre- and post-construction runoff. Due to a reduction in impervious cover

son Essex Passaic County Soil Conservation District, and the NJDEP. A hydrograph comparison has been performed to evaluate the pre- and post-construction runoff. Due to a reduction in impervious cover relative to the existing condition, the included hydrologic analysis demonstrates that for stormwater leaving the site, 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 events.

Stormwater Management Statement Proposed Site Improvements Township of West Orange, New Jersey October 8, 2024 TABLE 3: STORMWATER PEAK DISCHARGE Storm Event Pre-Development Peak Discharge Post-Development Peak Discharge Rate of Reduction 2-Year 0.68 CFS 0.68 CFS 0.00% 10-Year 1.07 CFS 1.06 CFS 0.94% 100-Year 1.83 CFS 1.82 CFS 0.55% TABLE 4: STORMWATER DISCHARGE VOLUME Storm Event Pre-Development Volume Post-Development Volume Volume Reduction 2-Year 2,425 CF 2,396 CF 29 CF 10-Year 3,852 CF 3,816 CF 36 CF 100-Year 6,660 CF 6,617 CF 43 CF No adverse impacts to the municipal drainage system or adjacent properties are anticipated as a result of the project. Detailed hydrologic calculations and mapping can be found in the Appendix of this Statement. Prepared by: Afton Savitz, PE NJ PE License No. 57674 Stonefield Engineering and Design, LLC

Stormwater Management Statement Proposed Site Improvements Township of West Orange, New Jersey October 8, 2024 APPENDIX A AERIAL MAP USGS QUAD MAP TAX & ZONING MAP

CHERRY STREET CHESTNUT STREET ELM STREET MAPLE STREET OXFORD PLACE FRANKLIN AVENUE KIRK STREET WHITTLESEY AVENUE WATSON AVENUE HIGH STREET TOWN OF MONTCLAIR TOWNSHIP OF WEST ORANGE SAMUEL STREET 200 FT SITE RADIUS SITE Z:\Rutherford\RUT\2021\RUT-210050 Manuel Vega - 66 Franklin Avenue, West Orange, NJ\CADD\Exhibits\Project Maps\2021-07-22_Project Maps.dwg AERIAL MAP SOURCE: GOOGLE EARTH PRO, DATED 10/13/2020 DRAWN BY: CHECKED BY: DATE: SCALE: PROJECT ID: NRK AMS 1" = 200' RUT-210050 GRAPHIC SCALE IN FEET 0' 1" = 200' 200' 200' 400' BLOCK 134.02, LOTS 75.03, 79 & 81 66 FRANKLIN AVENUE TOWNSHIP OF WEST ORANGE ESSEX COUNTY, NEW JERSEY PROPOSED RENOVATION & ADDITION Rutherford, NJ · New York, NY · Boston, MA Princeton, NJ · Tampa, FL · Royal Oak, MI www.stonefieldeng.com Headquarters: 92 Park Avenue, Rutherford, NJ 07070 Phone 201.340.4468 · Fax 201.340.4472 07/22/2021

CHERRY STREET CHESTNUT STREET ELM STREET MAPLE STREET OXFORD PLACE FRANKLIN AVENUE KIRK STREET WHITTLESEY AVENUE WATSON AVENUE HIGH STREET TOWN OF MONTCLAIR TOWNSHIP OF WEST ORANGE SAMUEL STREET LOT 82 BLOCK 134.02 LOT 81 LOT 79 LOT 75.03 LOT 75 LOT 74 LOT 72 LOT 71 LOT 68 LOT 102 LOT 100 LOT 99 LOT 98 LOT 97 LOT 96 LOT 95 LOT 93 LOT 91 LOT 86 LOT 83 LOT 87 LOT 88 LOT 90 LOT 67 LOT 1 LOT 2 LOT 4 LOT 6 BLOCK 138 BLOCK 137 LOT 87LOT 1 LOT 3 LOT 4 LOT 85 LOT 84 LOT 83 LOT 5 LOT 7 LOT 82 BLOCK 135 LOT 27.01 BLOCK 134 LOT 1 LOT 3 LOT 44 LOT 43 LOT 41 LOT 39 LOT 37 LOT 36 LOT 34 BLOCK 128 LOT 9 LOT 7 200 FT SITE RADIUS SITE Z:\Rutherford\RUT\2021\RUT-210050 Manuel Vega - 66 Franklin Avenue, West Orange, NJ\CADD\Exhibits\Project Maps\2021-07-22_Project Maps.dwg TAX & ZONING MAP SOURCE: TOWNSHIP OF WEST ORANGE TAX MAPS SHEETS 48, 49, 56, 57, 58 DATED 2011 AND ZONING MAP DATED 2020 & TOWN OF MONTCLAIR TAX MAP SHEET 19 DATED 1972 DRAWN BY: CHECKED BY: DATE: SCALE: PROJECT ID: 1" = 200' GRAPHIC SCALE IN FEET 0' 1" = 200' 200' 200' 400' BLOCK 134.02, LOTS 75.03, 79 & 81 66 FRANKLIN AVENUE TOWNSHIP OF WEST ORANGE ESSEX COUNTY, NEW JERSEY PROPOSED RENOVATION & ADDITION AMS 07/22/2021 NRK RUT-210050 Rutherford, NJ · New York, NY · Boston, MA Princeton, NJ · Tampa, FL · Royal Oak, MI www.stonefieldeng.com Headquarters: 92 Park Avenue, Rutherford, NJ 07070 Phone 201.340.4468 · Fax 201.340.4472

Z:\Rutherford\RUT\2021\RUT-210050 Manuel Vega - 66 Franklin Avenue, West Orange, NJ\CADD\Exhibits\Project Maps\2021-07-22_Project Maps.dwg USGS QUADRANGLE MAP SOURCE: USGS QUADRANGLE MAP 7.5 MINUTE SERIES, ORANGE, NJ, DATED 2019 DRAWN BY: CHECKED BY: DATE: SCALE: PROJECT ID: 1" = 1000' GRAPHIC SCALE IN FEET 0' 1" = 1000' 1000' 1000' 2000' BLOCK 134.02, LOTS 75.03, 79 & 81 66 FRANKLIN AVENUE TOWNSHIP OF WEST ORANGE ESSEX COUNTY, NEW JERSEY PROPOSED RENOVATION & ADDITION AMS 07/22/2021 NRK RUT-210050 Rutherford, NJ · New York, NY · Boston, MA Princeton, NJ · Tampa, FL · Royal Oak, MI www.stonefieldeng.com Headquarters: 92 Park Avenue, Rutherford, NJ 07070 Phone 201.340.4468 · Fax 201.340.4472 SITE

Z:\Rutherford\RUT\2021\RUT-210050 Manuel Vega - 66 Franklin Avenue, West Orange, NJ\CADD\Exhibits\Project Maps\2021-07-22_Project Maps.dwg FEMA EFFECTIVE MAP SOURCE: FEMA FLOOD INSURANCE RATE MAPS #34013C0111F, DATED 06/04/2007 & #34013C0112G, DATED 04/03/2020 DRAWN BY: CHECKED BY: DATE: SCALE: PROJECT ID: 1" = 1000' GRAPHIC SCALE IN FEET 0' 1" = 1000' 1000' 1000' 2000' BLOCK 134.02, LOTS 75.03, 79 & 81 66 FRANKLIN AVENUE TOWNSHIP OF WEST ORANGE ESSEX COUNTY, NEW JERSEY PROPOSED RENOVATION & ADDITION SITE AMS 07/22/2021 NRK RUT-210050 Rutherford, NJ · New York, NY · Boston, MA Princeton, NJ · Tampa, FL · Royal Oak, MI www.stonefieldeng.com Headquarters: 92 Park Avenue, Rutherford, NJ 07070 Phone 201.340.4468 · Fax 201.340.4472

Stormwater Management Statement Proposed Site Improvements Township of West Orange, New Jersey October 8, 2024 APPENDIX B NRCS SOIL REPORT