Chapter 18.3.9 PERFORMANCE STANDARDS OPTION AND PSO OVERLAY This chapter is included in your selections. Sections: 18.3.9.010 Purpose. 18.3.9.020 Applicability. 18.3.9.030 PSO-Overlay. 18.3.9.040 Review Procedures and Criteria. 18.3.9.050 Performance Standards for Residential Developments. 18.3.9.060 Parking Standards. 18.3.9.070 Setbacks. 18.3.9.080 Performance Standards Guidelines.