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Ammonia trickling out of a slag dump at Geneva Steel is ending up in Utah Lake, causing the plant to exceed federal wastewater standards. Geneva Steel used to cool its slag with ammonia-tainted water; USX followed the same practice when it operated the mill. Geneva began using clean water on the slag pile about 18 months ago, but the slag is so saturated with ammonia that the clean water becomes laden with the chemical. Geneva and the Division of Water Quality say they knew excess ammonia would come off the slag but underestimated how long it would take to flush out the chemical.