sentences:  In 2015, XTO contributed $5 million to the North Dakota Housing Incentive Fund, supporting the construction of low-cost apartments for teachers and emergency personnel.The donation was the largest since the fund was established in 2011.In July 2013, XTO agreed with the U.S. Environmental Protection Agency to pay a $100,000 fine for a November 2010 water spill at a Pennsylvania water recycling operation.