The pay range established for a class shall represent the base pay rate for full-time employment in the class, but shall not be considered as including reimbursement for official travel or other official expenses. No employee shall receive base pay from the City in addition to the pay authorized under the schedules provided in the pay plan. This Section shall not be interpreted to prevent the payment to or on behalf of employees of funds for retirement benefits, medical insurance or any other benefit approved by the Municipal Council. This Section shall also not be interpreted to prevent the payment of overtime, performance bonuses, awards, and/or work-related allowances authorized by the Mayor.