Any individual employed in state service in a temporary or seasonal position, as defined in this chapter, who has not been deemed permanent and whose employment calls for 30 hours or more work in a normal calendar week, but whose position is not anticipated to have a duration of 6 months or more, shall be entitled to elect to participate at their own expense in the group health and dental insurance plans afforded full-time state employees. The costs of health and dental benefits which any such individual elects to receive pursuant to this section shall be withheld from such individual's salary as a payroll deduction. The department of administrative services shall be authorized to invoice the individual for any amounts not paid through a payroll deduction.