Gedeon GRC Consulting served as the lead civil and traffic engineer responsible for all the civil/site and traffic engineering design aspects of the project including field assessment; utilities; MOT/MPT; stormwater management; Stormwater Pollution Prevention Plan (SWPPP); erosion and sedimentation control plans; drainage; track bed detailing including integration of geometric layout, typical sections, cross sections, and clearances; grading; development of contract documents, construction support services; agency coordination; and permitting.

This area, surrounded by waterbodies, has been flooded in the past during heavy rains.  One of the project’s objectives was to alleviate if not eliminate the flooding. Gedeon GRC performed a comprehensive watershed analysis to determine the flow within the projects limits in order to adequately size the drainage system, consisting of ditches with perforated pipes through the tunnel. The drainage calculations were prepared pursuant to the NJDEP Best Management Practices Manual for the 2-year, 10-year, and 100-year events. In order to properly size the under-drain pipes, our team had to factor water percolating through the tunnel wall.

The design was performed on a fast-track schedule, requiring multiple submissions, and involved extensive coordination with all parties. Due to the quick nature of this project, special consideration was given to document controls using Bluebeam, Autodesk BIM 360, and Autodesk Construction Cloud to track/maintain deliverable schedules.

At no cost to the client, Gedeon GRC is utilizing the Flyability Elios 3, a LiDAR equipped drone, to map the inside of the tunnel. Periodic scans of the site can be completed in under 30 minutes and converted into CAD models, enabling the contractor to confirm the site is being built according to the design specifications.