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COMMERCE CITY, Colo. — A refinery was the topic of concern for some residents at a packed meeting in Commerce City on Wednesday night.

The Suncor Energy plant had problems in the past, and worried residents talked about air quality and safe drinking water in neighborhoods.

The refinery is in northeast metro Denver surrounded by Interstates 270, 70 and 25.

Suncor Energy had been penalized in the past for air quality violations and is requesting modifications to air quality permits.

The modifications range from flare requirements to new vapor equipment.

The Air Pollution Control Division is listening to the modification request and concerns of people who live near the facility.

“Many of the modifications are intended to better control emissions at the refinery,” Suncor said in a statement.

Members of the Air Pollution Control Division have 45 days to return a decision on the modifications request.