(a) No operator shall permit a covered employee tested under the provisions of section 262.225 of this Part, who is found to have an alcohol concentration of 0.02 or greater but less than 0.04, to perform or continue to perform covered functions until:

1. (1) the employee's alcohol concentration measures less than 0.02 in accordance with a test administered under section 262.225(e) of this Part; or
2. (2) the start of the employee's next regularly scheduled duty period, but not less than eight hours following administration of the test.