Water and Sewer

E.M. Johnson Water Treatment Plant 12 Million Gallon (MG) Clearwell Rehabilitation

Improvement project will replace aging materials to meet future infrastructure capacity demand.

The E.M. Johnson Water Treatment Plant 12 Million Gallon clearwell is a 12 million gallon (MG) rectangular concrete structure, which is comprised of three individual 4 MG tanks which were constructed in 1965, 1972 and 1980 respectively. This project will consist of performing structural concrete repairs to the existing walls and floor slabs, as well as, retrofitting a baffle wall system in each of the three existing Clearwell sections. The baffle walls will improve chlorine contact time as required by the State of North Carolina to ensure the proper level of disinfection. A clearwell is a part of the City of Raleigh's municipal drinking water purification system. It is the final storage stage in the system, following the filtration and disinfection stages. The filtered water is held in a storage basin, clearwell, to allow the disinfectant to inactivate any remaining pathogens.

Project Details

 
Type:
Water and Sewer
Budget:
$9,100,000
Project Lead:
Perry A. Allen, PE
Contractors:
English Construction Company

Contact

 

Phone: 919-996-2870

Lead Department:
Water

Subscribe

 

Planning

This phase is complete.

Lead Department:
Water

Design

Phase is complete.

Brown & Caldwell completed the final design for the EMJWTP 12 MG rehabilitation portion of this project. Design included structural concrete repair to the existing walls and floor slabs, as well as, retrofitting a baffle wall system in each of the three existing clearwell sections. These repairs improved chlorine contact time as required by the State of North Carolina to ensure the proper level of disinfection.

Lead Department:
Water

Construction

Work that is currently being performed includes concrete repair work in the interior and exterior of the Clearwell sections that were constructed in 1972. This work will also include typical concrete crack repair, spall repair, support column repair and miscellaneous pipe support repair. Work in this section will also involve the installation of a fiberglass baffle wall system in order to improve the water quality performance as required to meet future water demands.

Clearwell_Inspection

Clearwell Inspection

Clearwell_Inspection_Pipe

Clearwell Inspection 

Lead Department:
Water

Complete

Phase to be updated when available. 

Lead Department:
Water

History

The E. M. Johnson Water Treatment Plant  (EMJ WTP) and its neighboring structures were originally constructed in multiple phases, with the first phase of the plant constructed in the 1960’s. This project was in the design phase. Brown & Caldwell performed a structural investigation and assessment of the E.M. Johnson Water Treatment Plant 12 Million Gallon clearwell. Findings from the initial assessment deemed that the clearwell's concrete structure has remaining useful life and can be cost-effectively rehabilitated to continue future operations. Brown & Caldwell developed a plan to rehabilitate the clearwell which will improve its operational flexibility and reliability.

Schedule

Date Activity
Winter 2021 Project Design Complete
Spring 2021 Permitting Complete
n/a Easement Acquisition Complete
Summer 2021 Project Bid Complete
Winter 2022 Project Construction Begins
Summer 2023 Project Construction Complete