Associated Press: A former hazardous waste site in Coventry could be converted into the largest solar energy farm east of the Mississippi River. New York-based Allco Renewable Energy says it will sign a letter of intent Tuesday to build the $45 million project on a 100-acre tract of town-owned land that was once home to a pig farm. A portion of the farm was declared a federal Superfund site in the 1980s. The Providence Journal reports that Coventry has agreed to give Allco a 50-year lease …