Another month, another gradual milestone for the exhaustibly-awaited cleanup of the Passaic River. The U.S. Environmental Protection Agency approved a final design for cleaning up the river’s lower 8.3 miles. Final approval for a plan to clean another 9 miles has not happened. It’s also not clear when the entire cleanup — covering both sections of the vast waterway that thousands rely on — will start. “Occidental Chemical-Glenn Springs is performing the design of the upper 9-mile interim cleanup plan under EPA oversight. Pre-design sampling has started and will continue through the summer and …