Chapter 3.10 PURCHASING POLICY This chapter is included in your selections. Sections: 3.10.010 Contract authorization limits. 3.10.020 Contract amendments. 3.10.026 Repealed. 3.10.028 Repealed. 3.10.030 Competitive negotiations. 3.10.040 Emergency purchases – Authorization. 3.10.050 Sole source purchases of equipment and materials – Authorization.