Article 15-4 STREET AND UTILITY IMPROVEMENT REQUIREMENTS This article is included in your selections. Sections: 15-4-1 Purpose. 15-4-2 Engineering plans. 15-4-3 Construction and inspection. 15-4-4 Required improvements subdivisions. 15-4-5 Submittal, review and approval of engineering plans. 15-4-6 Schedule of improvement requirements. 15-4-7 Fees.