(Brian Maffly | The Salt Lake Tribune) Rocky Mountain Power operates a research farm near its Huntington Power Plant in central Utah. According to allegations raised by HEAL Utah, the utility irrigates these fields with runoff contaminated from coal ash it stores nearby in two landfills. This waste, generated from burning coals for the past 40 years, poses an illegal threat to groundwater, the group alleges in a letter to RMP parent PacifiCorp.