An Ordinance declaring the intention of the City Council of the City of Ballard to construct a main sewer on First Avenue West from the center line of Albertson Street to the outlet in Salmon Bay as designated by the plans and specifications; to establish an assessment district and to assess the cost and expense of such main sewer to and against all the property included within such district which is contiguous or approximate to said street in which such main sewer in placed, by levying special taxes upon such property within such sewer district in accordance with the last general assessment of the land, exclusive of all the improvements, for city purposes.