Bob Gagnon, chair of the Lowell Flood Owners Group in Pawtucketville, wrote a letter to the SUN that was published yesterday. In it he included the address to which people with comments about the proposed “bladder dam” at Pawtucket Falls can send letters: Secretary of Energy and Environmental Affairs, 100 Cambridge Street, Suite 900, Boston, MA, 02114, Att:  Deirdre Buckey, EEA # 14603,  MEPA Office.