Middlebury College (in Middlebury, Vermont) operates a combined heat and power (CHP) plant to provide electricity, space heat, and hot water to campus buildings. In recent years, the college constructed a new biomass boiler in the CHP plant that uses locally produced, green wood chips. This equipment can displace up to 1,000,000 gallons of fossil fuel and is equipped with advanced emission control technologies.
RSG worked closely with the College, the Vermont Air Quality and Climate Division (Air Division), and equipment vendors in conducting a Best Available Control Technology (BACT) study for the new wood chip boiler and another new oil-fired boiler to identify to appropriate technologies for controlling emissions.
RSG also performed air quality modeling of plant emissions using the EPA-approved AERMOD dispersion model. Modeling results confirmed the existing central stack and proposed emission control technology would ensure compliance with ambient air quality standards.
Lastly, RSG prepared the Vermont Major Source air permit application to the Vermont Air Division for all CHP equipment. The application was accepted and a new air permit was issued.