Such procedures shall be in addition to any grievance procedure already established by the Board of Estimates. The employee shall have the right to choose which method of grievance procedure he prefers. Once an employee has elected to pursue a specific grievance procedure, he is bound by his election and he may not subsequently choose to follow a different procedure. City Code, 1976/83, art. 1, §132(2nd, 3rd sens.) Ord. 68-251 Ord. 72-241