YAKIMA, Wash., Oct. 10, 2012 /PRNewswire/ -- Today, a hearing was held in federal district court to determine whether Teck Metals, Ltd. (Teck) will be held liable under U.S. law for the industrial wastes it discarded into the Columbia River that traveled into the United States. The Confederated Tribes of the Colville Reservation, the State of Washington and Teck presented scientific evidence and admissions of Teck's discharges over a period of decades. "Over the last decade we've taken significant steps to ensure that Teck is held responsible for the millions of tons of hazardous substances it discarded into the River," said Colville Tribal Chairman John Sirois. "Teck's actions injured our Tribes' lands, waters, and other natural resources. The Columbia River and Lake Roosevelt is a center of our Tribal culture, and we want to ensure contamination in the River is adequately assessed and addressed. It's time to clean up the River." Since 2004, the Tribes and the State of Washington have been engaged in litigation with Teck related to the hazardous substances it discarded into the Columbia River. Last month, days before the trial was originally scheduled to begin, Teck finally admitted that it disposed of millions of tons of slag (smelting waste) and other hazardous waste including mercury, cadmium, zinc, copper, arsenic and lead into the Columbia River and Lake Roosevelt. Teck also admitted these wastes are releasing hazardous substances into the environment. For years, Teck has argued that its wastes are not present in the U.S., and if they are, its slag is "inert" and that not a single drop of their liquid effluent remains in the Columbia River. Recently, Teck admitted that its hazardous wastes are in the Columbia River, have leached, and are continuing to release hazardous substances including lead, zinc, arsenic, and cadmium into the environment.