Building Sewer System Resiliency for Continued Growth

Problem

The City of LaVergne has a Corrective Action Plan to minimize inflow and infiltration and plan for projected growth and higher peak flows, requiring a full upgrade of the city’s sanitary sewer system. The design of the new Upper Chaney Woods Interceptor Sewer crosses below Highway 41 and must avoid a 12-inch diameter high-pressure gas main with at least 2-feet of vertical clearance. This clearance posed an additional challenge because the exact route of the gas main was unknown.

Solution

The new 18-inch and 21-inch sewers are constructed using HDPE pipe and utilized boring under the highway. CTI provided coordination between the city, contractor, TDOT, and gas company as well as coordination for potholing near the road bore to determine the exact elevation of the existing gas line.

Project Elements

• 18- and 21-inch gravity sewer and manholes installation
• Trenchless Technology – road bores

CTI Services

• Design
• Construction Engineering Services