Exhibit O1 Boswell Engineering Verona Report

3|Page July 26, 2024 Re: West Essex Highlands LLC Preliminary and Final Site Plan Application Block 179, Lot 32 Warner Road BE Project No. VA-183 storage within the porous pavement system will be achieved based on the slope of the emergency access drive (a detail of the porous pavement system was not found on the plans that were reviewed). Also, the drainage report indicates an infiltration rate of 0.31 in/hr is being utilized in the analysis. It is not clear what this rate is based upon. A minimum field-tested hydraulic conveyance rate of 1.0 in/hr needs to be provided for the system (see Chapter 12 of the NJDEP Manual). The Overall Drainage Area Map indicates DA#6 encompasses an area of 0.27 acres (11,774 sf) of which approximately 0.07 acres (3,000 sf) are impervious. Compliance with the stormwater management rules should be demonstrated for this area. 11. Conveyance calculations were not found in the report. The capacity of the roof drainage system (gutters, downspouts, leader drains), and proposed storm sewer system, for Building D should be confirmed. The Township Engineer’s report indicates that the system must be designed for the 25 year storm. The system must have capacity for the maximum design storm (100-year event) and or demonstrate drainage boundaries will be maintained if any portions of the system were to surcharge. Inlets or pipes that surcharge for this higher event must overflow to the BMPs to which the piping is directed or the design will not be valid for the 100 year event. It is respectfully requested that the Planning Board consider these comments as it reviews the application. Very truly yours, filohe-— Paul W. Ferriero, PE, CME Boswell Engineering BOSWELL os ENGINEERING