The U.S. Environmental Protection Agency said Wednesday that Mid Pac Petroleum LLC paid a settlement of $600,000 for federal Clean Air Act violations at the company’s Kawaihae facility on Hawaii island.

EPA said that for more than a decade Mid Pac Petroleum failed to install required vapor pollution controls and comply with a volatile organic compound, or VOC, pollution limit at its gasoline storage facility.

“This is EPA’s second settlement in the past year that will improve air quality on the island of Hawaii,” said Alexis Strauss, EPA’s acting regional administrator for the Pacific Southwest, in a statement. “As with Aloha Petroleum’s facility in Hilo, we are requiring Mid Pac Petroleum to install air pollution controls, cutting health risks to local residents.”

At the facility, gasoline is pumped through a loading rack into tanker trucks to be delivered to different gasoline service stations. Pollution can occur when vapors containing VOCs and hazardous air pollutants leak from storage tanks, pipes and tanker trucks as they are loaded, the EPA said.

The EPA said Mid Pac emitted roughly 20 tons of VOCs into the air each year from its gasoline loading equipment. The petroleum provider will spend about $432,000 to bring its facility into compliance with the law and has agreed to pay a $200,000 civil penalty.

Par Hawaii Inc. will be overseeing the upgrades. Par Hawaii’s parent company, Texas-based Par Pacific Holdings Inc., purchased the parent company of Mid Pac Petroleum in April 2015.

Jim Yates, president of Par Hawaii, said in a statement the company takes its obligation to meet the regulatory requirements seriously and will take all reasonable steps required by the EPA.

“This was a matter in dispute between Mid Pac and the EPA at the time of Par Hawaii’s acquisition of Mid Pac,” Yates said. “Par believes that this consent agreement represents a reasonable resolution of the matter and looks forward to working with the EPA to timely achieve full compliance with this order.”