It is the purpose of this Section to: Outline the minimum acceptable standards for improvement of public streets and utilities as well as certain private street improvements; define the responsibility of the subdivider in the planning, constructing, and financing of public improvements; and to establish procedures for review and approval of engineering plans. All improvements required in streets, alleys, or easements, which are required as a condition to plat approval, shall be the responsibility of the subdivider. They may be allowed to meet the requirements by participation in an improvement district if approved by the Town.