Acquired by Southwest Gas Holdings in 2021

Southern Trails Pipeline is a 488-mile line extending from the Blanco hub in the San Juan Basin of northern New Mexico to delivery interconnects with California utilities. Southern Trails has a total daily transportation capacity of 80 MMcf and interconnects with several major pipelines serving the region. Update on the Southern Trails Pipeline Oil Conversion Project: Questar Southern Trails has entered into an agreement with an affiliate of Spectra Energy Corporation to evaluate alternatives for the conversion of some or all of the Southern Trails Pipeline to transport crude oil. These alternatives include evaluation of rail terminal locations or conversion of the entire pipeline including the western segment. The western segment (currently not in service) extends from a termination point near Whitewater, California, to the West Hynes crude-oil distribution system in Long Beach, California. Some of the pipeline conversion alternatives may require constructing a 110-mile pipeline segment in California to reconnect the eastern and western segments of Southern Trails. A decision on the future direction of the project will be made by year-end 2015.