CONCORD, New Hampshire, Feb. 24 -- The office of the U.S. Attorney for the District of New Hampshire issued the following news release: * * * Owner of Old Dutch Mustard Co. Pleads Guilty to Violating the Clean Water Act by Polluting the Souhegan River CONCORD - A New York man and Old Dutch Mustard Co., a mustard and vinegar manufacturing company, pleaded guilty in federal court to knowingly discharging acidic water into the Souhegan River, Acting U.S. Attorney Jay McCormack and Principal Depu  more