Soda Springs, Idaho-Agrium Inc. officials expect that cleanup and remediation of the release of 5 million gallons of acidic water from a gypsum stack two days after Christmas at its Idaho operations will cost about $1 million. Some 85 percent of the water was retrieved. Cause of the dike failure, which triggered a quick response of equipment and workers, is still unknown, but General Manager Charles Ross says the investigation is underway and problems will be identified and corrected before spring.