No sanitary sewer line extension shall be made by the city except on an approved dedicated street, alley or recorded easement. No sanitary sewer line shall be installed with less than a minimum pipe size of eight (8) inches in diameter or such larger diameter as may be determined by the city engineer based on criteria approved by the council. Prior to construction of any line by other than the city, the applicant for a sanitary sewer line extension shall enter into a written agreement for each such extension which agreement shall be approved by the city engineer. (Ord. No. 204, § 1, 7-25-84. 1976 Code § 11-6-1)