Chestnut & Sixth Streets Combined Sewer Rehab

Project Overview

The City of Columbus selected Ribway as a prime consultant for the rehabilitation of a major downtown roadway and the separation of a storm and sanitary sewer system. This project aimed to reduce combined sewer infiltration and inflow while reconstructing aging infrastructure in a heavily congested downtown area.

Key Responsibilities

Part 1: Combined Sewer Rehabilitation

• Scope: Rehabilitated approximately 2,000 linear feet of 108″–117″ brick sewer with 14 manholes along Chestnut and Fourth Streets and approximately 1,600 linear feet of 27″–48″ brick sewer with 10 manholes along Sixth Street and Mt. Vernon Avenue.
• Services Provided:
  • Sewer cleaning and inspection.
  • Field surveys and geotechnical investigations.
  • Evaluation of existing condition and recommendation of rehabilitation techniques.
  • Hydrologic and hydraulic analyses.
  • Preparation of design reports, detailed plans, and specifications.
  • Traffic maintenance plans and road closure management.
  • Engineering services during construction.

Rehabilitation Techniques

• Shotcrete for large brick sewers.
• Cured-in-Place Pipe (CIPP) lining for medium-sized sewers.

Project Challenges

• Coordinating major utility relocations.
• Maintaining traffic flow and managing bypass pumping.
• Securing necessary easements in a busy downtown area.

Timeline

• Design Completion: October 2008
• Construction Completion: March 2010

Results

The project successfully rehabilitated critical sewer infrastructure, improved stormwater management, and reconstructed the roadway, demonstrating Ribway’s ability to handle complex urban engineering projects.