Minorities and low-income residents in the Indianapolis metropolitan area are at the most risk from toxic chemicals, according to a study released yesterday by the Indianapolis Urban League Environmental Coalition. A non-white Indianapolis resident is 26 percent more likely than the average resident to live within 550 yards of a company releasing toxic chemicals, and a person earning less than $15,000 a year is about twice as likely as the average resident to live within 550 yards of such a facility. Similar statistics can be found throughout the nation, said Otha Meadows, Urban League executive vice president.