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Pushing Sustainability Forward. Case Studies

Municipal

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Project

Alum Creek Large Diameter Sewer Assessment

Client

The City of Columbus, Ohio, Department of Public Utilities, Division of Sewerage and Drainage

The City of Columbus, like many municipalities, must make hard decisions on where to spend their limited capital improvement dollars. In tight economic conditions, a municipality’s decision to monitor, rehabilitate, or replace their assets is not cut and dry. Deferred maintenance of non-critical assets in one department may give other departments the monetary resources to address serious problems with their facilities.

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Project

Biological Nutrient Removal

Client

Mountaintop Area Joint Sanitary Authority

Chester Engineers was contracted by the Mountaintop Area Joint Sanitary Authority to design an upgrade to the existing treatment plant to address new Chesapeake Bay nutrient requirements and to eliminate the use of chlorine for ammonia nitrogen removal and disinfection to address trihalomethane permit violations.  Chester was also required to complete the design to permit submission level requirements within three months in order to allow the Authority to apply for possible grant funding from PENNVEST.

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Project

60" Water Transmission Main Improvements

Client

Pittsburgh Water and Sewer Authority (PWSA)

An existing 60-inch diameter riveted steel water line approximately 10,000 feet in length serves PWSA customers and provides a back-up feed to the Fox Chapel Water Authority.  This line was installed around 1905 and required refurbishment or replacement to insure integrity of service.  Chester was contracted to investigate, design and implement a project to refurbish the line to avoid a costly and disruptive total replacement of the line.  Furthermore, Chester was also challenged to complete the design within two months to take advantage of available low interest PENNVEST loan monies that were not likely to be available in later funding cycles.

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Project

Southerly WWTP Corrosion Prevention and Protective Coating Systems

Client

The City of Columbus, Ohio, Department of Public Utilities, Division of Sewerage and Drainage

Millions of dollars are lost each year because of corrosion. Much of this loss is due to the corrosion of iron and steel from oxide formed by oxidation that does not firmly adhere to the surface of the metal. This flakes off easily causing pitting. Widespread pitting eventually causes structural weakness and disintegration of the metal. Many factors affect the rate of corrosion but the presence of water, moist conditions and hydrogen sulfide which are inherent to wastewater environment accounts for the fact that corrosion occurs much more rapidly at wastewater related facilities.

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Project

Wet Weather Program

Client

Allegheny County Sanitary Authority

Plan for the development of the most feasible methods for controlling combined sewer overflows (CSOs) to a level such that applicable water quality standards are attained in accordance with an EPA Consent Order Agreement.

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Project

Water Distribution System Master Plan

Client

The City of Columbus, Ohio

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Many established municipalities have infrastructure in need of repair or replacement, and the City of Columbus is no different.  Columbus has components in its water system that need to be replaced because of age or upsized due to increasing demands throughout the system.  Additionally, developments are sprouting up outside the City limits, but still within the Columbus service area.  This continued growth creates the need to extend the already 3,600 mile network of water mains, booster stations, storage tanks and pressure reducing valves further outside the City, while continuing to upgrade the aging infrastructure within the system.  The City contracted with the Chester Engineers team to complete a comprehensive evaluation of the City’s Water Distribution System with regards to future demands, facilities upgrades and optimizing the system for energy and operations and management savings.

 

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Project

Southerly Wastewater Treatment Plant

Client

The City of Columbus, Ohio

The City of Columbus committed to substantial improvements of the collection systems and treatment plants under the City's Wet Weather Management Plan (WWMP). This plan was devised to conform to the requirements of the consent order, agreed to by the City of Columbus and the State of Ohio. The treatment plant projects required 'orchestration' so that previous tasks would be completed in order for the later tasks to be started. The work included construction of three Final Clarifiers at each plant where an existing Effluent Control Building (ECB) is located and construction of a new Effluent Pump Station (EPS) and Outfall Sewer- to replace the existing ECB. This EPS includes a new effluent pumping building, flushing water building, effluent metering building, sampling chamber, and an outfall conduit to the Scioto River.

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Project

Southerly Wastewater Treatment Plant, S71 New Effluent Pump Station and Effluent Conduit

Client

The City of Columbus, Ohio

Due to an Ohio Environmental Protection Agency's Consent Order and the increased demand in the Central Ohio area, the City of Columbus started projects to upgrade the Southerly Wastewater Treatment Plant. This was the first of several projects required to be completed to bring the Southerly Plant into compliance. The design parameters required the Effluent Pump Station facility to have a maximum hydraulic pumping capacity of 330 mgd, expected in the year 2010 at this plant. The structures (EPS and EDC) are designed to have a maximum hydraulic capacity of 440 mgd in 2010.

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Wet Weather Program
 
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