CME Associates Review 2

- ASSOCIATES Chairman and Members of the West Orange Township Planning Board July 29, 2024 Re: West Essex Highlands, LLC (PB 24-01) Our File No. VWRP0179.01 Preliminary & Final Site Plan - Review #2 Page 8 e) Emergency access drive gate. f) Retaining walls. g) Porous HDPE pipe installation detail. h) Sanitary sewer manhole. i) Sanitary force main. j) Tennis courts k) Gazebo |) Pergola m) Span bridge E. DRAINAGE COMMENTS 1. The proposed development will result in the disturbance of more than one acre. As a result, it is classified as a Major Development and is subject to the stormwater management requirements set forth in Section 25-29.4 of the Ordinance. In accordance with Section 25-29.4.j, manufactured treatment devices may be used to meet the requirements of this subchapter, provided the pollutant removal rates verified by the New Jersey Corporation for Advanced Technology and certified by NJDEP. The Applicant should provide copies of the NUDEP certification to confirm the proposed MTD’s will meet the green infrastructure requirements. It appears that soil testing, including soil profile pits and/or soil borings, have been performed throughout the site. However, copies have not been provided to the Board. The Applicant should provide a copy of the soil report to the Planning Board and our office for review. The Stormwater Management Report should be revised to include a Low Impact Development Checklist. The Stormwater Management Report should be revised to include a completed Hydrologic Modeling Database - Data Entry Short Form. Our office notes that storm sewer pipe size calculations were provided and appear to be acceptable. However, a storm inlet drainage area map should be included in the Stormwater Management Report to verify the area draining to each inlet. The Stormwater Management Report must be revised to include existing conditions hydrographs to verify the existing runoff rates as described in the report narrative. The tables in the Stormwater Management Report which outline pre- and post- development peak runoffs should be revised to be consistent with the stormwater analysis. All un-detained areas must be included. The Pre-Development Drainage Area Map should be revised to remove all proposed improvements and should only reflect current existing conditions. Additionally, the time of concentration flow path for each point

evelopment Drainage Area Map should be revised to remove all proposed improvements and should only reflect current existing conditions. Additionally, the time of concentration flow path for each point of analysis shall be indicated. S:\West Orange\Planning Board\VWRPO179 01 - West Essex Highlands, Inc\Review #2 07-29-24 docx