Proficiency Step Increases. All regular employees shall be eligible for a one step pay increase (not to exceed Step 8 of Appendix A) upon completion of one full working year of employment and each full year thereafter upon their payroll anniversary date providing they receive satisfactory performance appraisals. Every employee shall receive a performance appraisal at least annually even if the employee is at the maximum rate for his/her classification. Employees continue to be eligible for pay step increases until they reach the top of the salary range. Denials of the step increase shall be subject to the grievance procedure.