Akron Waterways Renewed Program: Middlebury Sewer Separation | Green Project

Design completed: April 2016
Construction completed: October 2017
Client: Hazen & Sawyer

Project Overview

Ribway was part of the Consultant Team selected to provide professional design engineering services for this project involving sewer separation of existing combined sewers and elimination of two overflows from Racks 5 and 7 Sewershed tributary to the Little Cuyahoga River. The project is located in the Middlebury Project Area of Akron, Ohio and is a part of the Consent Decree implemented and updated by Akron’s Advanced Facilities Plan Update to eliminate overflows by October 2017.

Ribway’s services included:

• Review of existing record documents
• Field investigations
• Review of CCTV videos and recommendations for rehabilitation and repairs to combined sewers, which were to be re-purposed to sanitary sewers or storm sewers
• Preparation of a design report summarizing rehabilitation recommendations and construction costs
• Preparation of construction drawings for the recommended point repairs and CIPP lining

Ribway reviewed CCTV videos for over 120 sewer segments totaling over 19,000LF. Pipe diameters ranged from 8-inches in diameter to over 54-inches. Pipe materials included reinforced concrete, PVC, vitrified clay and segmental block. Rehabilitation alternatives considered CIPP lining, slip lining, pipe replacement and point repairs

Ribway’s recommendations included CIPP lining and point repairs of 28 segmental block combined sewer segments totaling over 4,000 LF. The evaluations required structural reviews of the pipe segments using NASSCO PACP guidelines and determination of segment failure risks. The risk of failure considered pipe segment locations, such as in arterial streets or under structures (buildings) and upstream/downstream location of the sewer segment within the sewershed. Sewer segment risks were considered high if the segment was in a downstream location and low for segments in the upstream location.

Challenges encountered during design included coordination with other projects being designed and a condensed project schedule. Construction of the project will be performed by a Construction Manager at Risk selected based upon a Guaranteed Maximum Price of the 60% plans.