The Chestnut Hill Reservoir reactivated May 1 due to the rupture of the primary water main in Boston, and remains as an important emergency backup source of water and recreational site to the community. Marines with 3rd Battalion, 24th Marines, Lima Company, from Johnson City, Tenn., volunteered to help clean up the reservation in support of Marine Week Boston May 3. - The Chestnut Hill Reservoir reactivated May 1 due to the rupture of the primary water main in Boston, and remains as an important emergency backup source of water and recreational site to the community. Marines with 3rd Battalion, 24th Marines, Lima Company, from Johnson City, Tenn., volunteered to help clean up the reservation in support of Marine Week Boston May 3.