Grand Forks, N.D.-An anhydrous ammonia leak at a J.R. Simplot Co. Grower Solutions plant in Grand Forks, N.D., triggered an evacuation on Thursday afternoon, July 17. Although initial reports indicated a major leak, Grand Forks Battalion Chief Rick Coulter said it turned out to be less than expected. Simplot workers were replacing some valves when 10-12 gallons spilled, triggering alarms and prompting the evacuation, Coulter said, adding that Simplot’s venting system dispersed the gas harmlessly. Half a dozen fire engines and several police patrol cars responded.