Interesting question. As Chris stated above, you should consult with the AHJ, a licensed electrician, and the utility company.
Why did I add the utility company?
Some utility companies require the ground to grounded conductor (neutral) connection to be made in the meter base. This maybe your case since you stated the [U]neutral and the ground are connected together in the meter base[/U]. This is not typical and is usually done in the main service equipment disconnect panel. It is very crucial to make sure the ground to grounded conductor (neutral) connection is made at one location and one location only.
Have you laid eyes on the ground to neutral bonding in the meter base?
Interesting article on bonding [url]http://www.adamselectric.coop/wp-content/uploads/2015/02/Grounding-Bonding.pdf[/url]
The neutral ground connection must be made AT or BEFORE the first disconnecting means. I have never ran across a utility that required the bond in the meter but they did not discourage it. There are some utilities in other states that forbid the bond in the meter base. Their reasoning is if there were a problem the seal would be cut and meter removed. Something they don't want done. Some utility's supply the meter base and they don't want anyone messing with their equipment.
I have seen the grounding electrode conductor ran up the wall and bonded to the neutral at the weather head. That was done when copper was cheap