MN HF3027

Facilities with incinerator permits containing mercury emission limits must conduct periodic stack testing for mercury, with hospital waste incinerators under 3,000,000 BTU's per hour allowed to use mercury segregation as an alternative.

Standard testing intervals are every three months, or every 12 months for facilities burning greater than 30 percent refuse-derived fuel by weight, with quarterly testing required after any permit exceedence until compliance is restored.

Facilities demonstrating mercury emissions below 50 percent of their permitted limit for three consecutive years may reduce testing to once every three years or per federal requirements, whichever is more stringent.

New incinerator units at facilities that previously met reduced testing requirements may use the less frequent testing schedule if the new unit demonstrates emissions below 50 percent of its permitted mercury limit for one year.

If testing shows emissions exceed 50 percent of the permitted limit, facilities must return to annual testing until emissions drop below 50 percent, then may resume three-year testing intervals upon commissioner notification.