Case Studies

The Flow Below

In the second phase of extensive wastewater system upgrades in Plainfield Charter Township, Mich., five pump stations were to be either rehabilitated or replaced. In addition to the pump station upgrades, the Scott Creek Trunk Sewer was to be replaced or rehabilitated from West River Drive to Pine Island Drive. Plainfield Charter Township is a large and growing community just north of Grand Rapids, Mich. It was imperative that these improvements were done quickly and efficiently to provide as little disruption to the surrounding community as possible.

A Steel-Reinforced Sewer Storage Solution

At the turn of the 20th century, the City of Portsmouth, Ohio, constructed a nearly 2.5-mile brick tunnel sewer from the Ohio River through the hilltops of the city to enclose Lawson Run Creek. The tunnel ranged in size from 144-in. diameter sewer near the river (at the present wastewater treatment plant) to a 48-in. diameter sewer in its far upstream reach at the north end of the city.

Cleaning Up After Clean Energy

In Niagara Falls, N.Y., three engineering firms were involved in different phases of design for a new intermodal facility for Covanta—one of the world’s largest owners and operators of infrastructure for the conversion of waste to energy. Contech Engineered Solutions provided assistance with the storm water management system required in conjunction with this rail-to-truck intermodal facility being constructed as part of the expansion project for Covanta Niagara.

Giving Sewers the Slip

Confronted with a deteriorated sanitary sewer routed deeply beneath several major roadways and a well-established residential area, the Baltimore County Department of Public Works opted for a relining program rather than replacement. A sizeable portion of the Long Quarter Outfall Rehabilitation Project involved placing 24-in.-diameter liner inside a deteriorated reinforced concrete main via slip lining.

Making Contact

The City of Culver, Ore., was in need of a better way to recycle and reuse the wastewater stored in its lagoons, so that it would still be able to accomplish land disposal.

Rolling the Dice

In January 2004, the City of North Las Vegas’ city council authorized an in-depth analysis on wastewater treatment options for the municipality, and then, later that year, began planning for construction of a new wastewater reclamation facility. Construction of this facility—an approximately $321.3 million project—was completed in fall 2011.

In Too Deep?

The Mount Sterling (Ky.) water and sewer system needed a 30- and 36-in. sanitary sewer trunk line to handle increases in local sewer flows in the Hinkston Creek area. The project required a high-performing sewer pipe to withstand the deep burial requirements—more than 25 ft in some areas.

Easy In, Easy Out

The City of Topeka, Kan., had scheduled the repair of several hundred feet of deteriorating reinforced concrete pipe (RCP) sanitary sewer line at its South Kansas River pump station in the fall of 2013. Rather than undertake a costly replacement that would close the pump station and interrupt the high water flow during excavation, the city looked into optional rehabilitation and slip-lining methods. Its intent was to install a liner to restore the structural integrity of the original 78-in. diameter pipe and prevent failures while reducing the groundwater infiltration into the system.

A Durable Pipeline

The first phase of the Eastern Idaho Regional Wastewater Authority’s (EIRWWA) Regional Wastewater Treatment Plant, with a price tag of approximately $21 million, was completed in 2009. The facility, located in Shelley, Idaho, was designed to handle up to 2 million gal of sewage per day (mgd) with the possibility of expanding to 8 mgd. A large diameter sanitary interceptor line was run from Bingham to Bonneville counties, connecting Shelley with the city of Ammon.