“(a) Subject to the Environment Quality Act (chapter Q-2), to regulate the sewerage of the municipality and to construct or otherwise acquire any public sewer; the costs of construction, in whole or in part, of any public sewer, including connections, between such public sewer and private drains or between such public sewer and the street line if there be no private drain, including also the costs of such repairs as are rendered necessary in the saving on account of the construction of private drains, shall be assessed equally among the owners, occupants or tenants of the buildings situated on any street in which such a public sewer has been constructed; the sums so required may be levied and recovered as a special tax; the second subparagraph of subparagraph c of paragraph 11 shall apply, mutatismutandis, to this subparagraph;”;