Cleared your probationary period

You are a new officer, just having cleared your probationary period, and you want to impress you supervisor with your aggressiveness. You spot a vehicle going 10 miles over the speed limit. It is 2 a.m. on a quiet street. You make a traffic stop and when you approach the vehicle after it stops; you realize you have pulled over your Operations Captain. What would you do and why? Explain your thought process and back-up your decision.