Chapter 10A.25 WATER SYSTEM – EXTENSIONS This chapter is included in your selections. Sections: 10A.25.010 General. 10A.25.020 Developer Constructed Extensions. 10A.25.030 Sizes and Standards for Extensions. 10A.25.040 Oversizing of Water Mains. 10A.25.050 City Constructed Extensions. 10A.25.060 Reimbursement Contracts.