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BOISE -- A pair of gas delivery companies operating in Idaho will pay thousands of dollars in penalties for violating federal clean air laws.

The Environmental Protection Agency announced fines Wednesday for CityServiceValcon, LLC, and Thomas West Fuels, Lubricants & Chemicals, LLC.

EPA officials say both companies failed to follow mandatory rules for unloading fuel into storage tanks at two gas stations -- one in Lewiston and the other on the Fort Hall Indian Reservation in eastern Idaho.

Officials say a lack of vapor control systems caused at least 10 tons of volatile organic compounds to escape at the Lewiston station between January 2011 and January 2012. About five tons escaped at the Fort Hall station.

CityServiceValcon will pay a $48,000 penalty, while Thomas West Fuels will pay a $45,600 penalty.

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