Peoria Sewer System Evaluation

Location

Peoria, Illinois

Service Group

Civil / Environmental

Description

The City of Peoria needed to repair its separate sewer system to enable transfer of the operation and maintenance to the Greater Peoria Sanitary District. Clark Dietz was contracted to complete a sewer system evaluation and rehabilitation recommendation program for Design Area 1, one of four areas of the City to be evaluated. Following this project, known as Phase I, will be design engineering and construction engineering. The project involved GIS location and above-ground inspection of approximately 1,285 manholes and televising of nearly 349,000 feet of sewer mains, ranging from 8-inch to 60-inch in diameter.

The project area included more than four square miles in the eastern part of the city. Key objectives of the project were to obtain an understanding of the Peoria design area, locate and provide GIS location data for all manhole structures, assess the current condition of the system, and formulate a recommended rehabilitation plan that improved the sewer system infrastructure while staying within the construction budget.

Project area manholes were investigated to determine the condition of manhole covers, frames, riser rings, corbels, barrels, benches, and troughs. Manholes in the project area were in varying degrees of deterioration, with some constructed earlier than 1950. GIS coordinates were determined for each of the manholes.

In addition to preparing the contract drawings for the televising project, Clark Dietz also provided construction inspection for this part of the project. Sewer line conditions were then reviewed and rated.

From the data gathered, a report was prepared detailing the current condition of all project area sewers and manholes. The report also included a rehabilitation schedule to aid in the design and construction engineering.