In order to be compensable by cash or compensating time off, overtime in Work Week Group 1 and Work Week Group 4 and Subgroups 4A, 4B, and 4D must be authorized in advance, except in an emergency, by the appointing authority or its designated representative. This authorization must also be confirmed in writing not later than 10 days after the end of the pay period during which the overtime was worked. Each state agency shall maintain complete and accurate records of all compensable overtime worked by its employees.