Burlington, Iowa

Tier II MATS Compliance – Unit 1

Client / Owner

Alliant Energy

Architect / Engineer

Sargent & Lundy, LLC




Graycor Industrial

Project Scope

Graycor Industrial Constructors was contracted along with Sargent & Lundy (engineer) to complete environmental upgrades to a series of coal-fired plants owned by Alliant Energy. In total, four generating units at three of Alliant’s Midwest plants received emission reduction upgrades. The improvements, related to air quality control systems (ACQS), will reduce mercury and fine particulate matter emissions and support compliance with the federal Mercury Air and Toxics Standards (MATS) rule.

For Alliant Energy’s ACQS projects, Graycor worked closely with local trades and equipment manufacturers to complete these compliance-driven environmental upgrades at generating stations in Iowa and Wisconsin. Work included foundations, piping, conduit and cabling, air and water systems, equipment skids incorporating blowers and pumps, distributed control system (DCS) interface controls and the offload and setting of storage silos and tanks. With each of these complex projects, scheduling and coordination among project participants were key components of success.

At the Burlington Generating Station in Burlington, Iowa, teams installed activated carbon injection (ACI) systems, calcium bromide chemical feed systems and liquid flue gas conditioning (LFGC) equipment. Lasting six months, the project also included construction of a pre-engineered building and associated HVAC as well as the removal of electrostatic precipitator (ESP) inlet nozzles and replacement of this equipment by a new ESP inlet duct arrangement that included 120 tons of new ductwork completed incident-free and ahead of schedule.