Drainage Report

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Bese AGS Anderson Consulting Services LLC Water Quality Calculation The project has been designed with green technology solutions for water quality improvements. In all areas of the project site. Solutions include both manufactured devices like the filterra which is approved as green technology for 80% removal, small scale infiltration basins, large scale infiltration basins, porous pavement and mechanical devices including the Cascade separator and the Kracken filter system. The table below outlines the vehicle surface area for each basin and the water quality device designed to achieve the required water quality. The table calculates the average for the entire site. Vehicle Surface Areas Area Vehicle Area (sf) Device % removal Area X % Basin 1 88791 Filterra 80% 71033 Basin 2-1 0 Cascade & Small | 50% & 80% 0 scale infiltration total 90% Basin 2-2 29657 Cascade & Small | 50% & 80% 26691 scale infiltration total 90% Basin 2-3 9495 Cascade & Small | 50% & 80% 8546 scale infiltration total 90% Basin 2-4 23633 Cascade & Small | 50% & 80% 21270 scale infiltration total 90% Basin 2-5 0, Roof and basin | Cascade & Small | 50% & 80% 0 surface only scale infiltration total 90% Basin 2-6 0, roof and basin | Cascade & Small | 50% & 80% 0 surface only scale infiltration total 90% Basin 3 25084 Cascade & Small | 50% & 80% 22576 scale infiltration total 90% Basin 4 24519 Porous pavement | 80% 19615 Basin 5 22407 Cascade & Small | 50% & 80% 20166 scale infiltration total 90% Basin 6 2683 Porous Pavement | 80% 2146 Un-detained basin | 17864 Kracken 80% 14291 5 Un-detained basin | 5633 Filterra 80% 4506 3 Un-detained 7246 None 0% 0 basin 1 Totals 257012 sf 210,840 sf % removal of suspended solids from Vehicle surface areas for the site equals (area x % total)/ total area= 210,840/ 257,012 = 82% Anderson Consulting Services LLC 40 Miller Drive, Boonton, NJ 07005 973-975-0703 (O) 973-886-7336 (C) PAndersonpe@gmail.com 38

ps el ACS Anderson Consulting Services LLC Culvert Design The roadway to Building D crosses a small stream, and the roadway design includes a culvert designed to convey the runoff from the drainage area upstream of the culvert. The stream has a drainage area of 18 acres, so no FHA permit is required by NDEP. The crossing does have to meet the standards for riparian zone disturbance, and this is the subject of our NJDEP application. The culvert capacity has been designed to convey the flow through the culvert with 1 foot of freeboard for the 100-year storm. Hydrographs and a routing of the flow through the culvert are included in this report. Conclusion The design of the West Essex Highlands Project has been completed in accordance with the court approved resolution with the limiting of the area of disturbance below 30 acres and the inclusion of environmentally friendly designs that are sensitive to the existing environmental constraints. The stormwater design includes green technology for water quantity, quality and seeks to optimize the volume groundwater recharge with green technology. The overall discharge has been conservatively calculated for each drainage basin and overall and meet the discharge standards as required in the state standards and municipal ordinance. 39 Anderson Consulting Services LLC 40 Miller Drive, Boonton, NJ07005 973-975-0703 (O) 973-886-7336 (C) PAndersonpe@gmail.com