Employers shall commence keeping records documenting hours worked by employees, sick time taken by employees and payment made to employees for the sick time if payment was made upon the effective date of this Chapter, shall retain such records for a period of two years, and shall allow the Agency access to such records, with appropriate notice and at a mutually agreeable time, to monitor compliance with the requirements of this Chapter. When an issue arises as to an employee's entitlement to sick time under this Chapter, if the employer does not maintain or retain adequate records documenting hours worked by the employee and sick time taken by the employee, or does not allow the Agency reasonable access to such records, it shall be presumed that the employer has violated the Chapter, absent clear and convincing evidence otherwise.