The size, type and quality of materials and location of lines shall be specified by the public works department and/or duly authorized representative in conformance to the city comprehensive plan. The actual construction will be done by the public works department or by a contractor acceptable to it, supervised and inspected by the public works superintendent and/or duly authorized representative. [Ord. 910 Art. 5, § 6, 2016; Ord. 878 Art. 5, § 6, 2015.]