increase font size Gardiner wastewater treatment upgrades are underway The $3.5 million project, funded by a combination of federal loan and grant money, is replacing the aging treatment infrastructure with a newer version that's more energy efficient. Share Cote Crane and Rigging workers insert a bearing Tuesday within one of five new rotating biological contacts installed at the Gardiner Wastewater Treatment. Andy Molloy/Kennebec Journal GARDINER — The $3.5 million project to upgrade Gardiner’s waste water treatment plant that has been several years in the making is now underway and is expected to be substantially complete by the end of the year.