The U.S. Environmental Protection Agency has given a $650,000 boost to an ongoing cleanup of a series of mill complexes in Vernon that are collectively targeted for a 200-unit apartment mixed-use redevelopment. U.S. EPA New England Administrator David W. Cash; U.S. Sen. Richard Blumenthal, D-Conn.; U.S. Rep. Joe Courtney, D-2nd District; and other dignitaries visited the Daniels Mills site at 104 East Main St. Thursday to celebrate the award. Vernon has an agreement with Georgia-based developer Camden Management Partners to transform the defunct mills into 200 apartments with up to 20,000 square feet of commercial space, according to Shaun W. Gately, the town’s director of development services and economic development. The Connecticut Department of Economic and Community Development has already directed $6.5 million in brownfield cleanup assistance to the site, Gatley said. This latest infusion from the EPA is expected to carry the cleanup to the point where Camden can secure funding and begin work, Gatley said.