January 2006

Earth Tech selected to design biosolids facility in Tennessee

Long Beach, CA— Earth Tech has been selected to design a new biosolids facility in Nashville, Tennessee for the Department of Water and Sewage Services of the Metropolitan Nashville and Davidson County. Earth Tech, a business unit of Tyco International Ltd, will serve as a subcontractor to Archer-Western Contractors, Ltd., a division of the Walsh Group, on the $117 million project.

Earth Tech will provide engineering services during construction; prepare operations and maintenance manuals; and provide staff training; and start up and commissioning services.

A major part of the project is to design and build the sludge thickening, digestion, dewatering and heat drying facilities that will convert sewage sludge into biosolids for reuse as fertilizer.

“Communities like the Nashville metropolitan area face simultaneous challenges: how to efficiently dispose of sanitary system byproducts while meeting changing federal regulations,” said Alan Krusi, Earth Tech president.

The new facility, which will have a maximum capacity of 137 dry tons of sewage solids per day, will reduce odors emanated by the Central Wastewater Treatment Plant by replacing the current practice of land filling raw sludge with the new biosolids drying process.

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