Maine and Augusta city officials say the owners of a riverside historic site are neglecting the Kennebec Arsenal and failing to protect it from vandalism. The Kennebec Journal in Augusta says Sunday a letter’s been sent to North Carolina-based Niemann Capital, the property’s owner, which plans to redevelop the 19th Century site for residential and commercial use. The property, within site of the State house,includes several granite structures whose windows have been broken and have been marked with graffiti. Thomas Niemann says his firm is dedicated to its plan for restoring and renovating the complex, but plans have been hampered by the struggling economy. Niemann tells the newspaper that it’s trying to protect the property from further damage.