New Techniques to Protect the Environment

Part of the federal and state Revolving Loan Fund program, this project upgraded collection, transport and wastewater treatment facilities for the City of Rogers, Arkansas. MWY was responsible for conceptual planning, design and construction supervision.

The presence of several endangered, threatened and sensitive species in the project area required close coordination with federal agencies such as the Environmental Protection Agency, U.S. Fish & Wildlife and the Army Corps of Engineer. And to meet stringent environmental standards, MWYís design included the use of stream bank stabilization techniques not previously used in Arkansas.

The expansion of the 12 MGD wastewater treatment plant included the design and construction of a new effluent flow-diversion facility, a flow-equalization headworks facility and a 13 MG flow-equalization facility. The project also included the construction of 100,000 feet of sanitary sewer line, ranging from 8 inches to 42 inches in diameter.

Sewer Improvements on Rocky Terrain

This project included a new gravity-flow interceptor sewer on the west side of Bentonville and a force main from a new lift station to the City's existing wastewater treatment plant. The gravity-flow improvements allowed elimination of five lift stations.

The need to excavate trenches up to 25 feet deep, many of them through extremely rocky terrain, provided a major construction challenge for this wastewater-collection improvement project. Upon completion, the improvements included 12 miles of 15- to 24-inch gravity interceptor sewers and required four major highway crossings.