How do I get rid of ground bees in a retaining wall?

Question

I have seen many suggestions about pouring gas in the hole, but there really isn't a hole. They are getting through openings in our wood retaining wall which is close to collapsing after having road work done. I am extremely allergic to bees and discovered these were there after being stung while doing yard work. I had to sit at the hospital for 3 hours so these NEED TO GO!!!! Any tips would be extremely grateful!!

Here is pics of the wall so you can see what I mean

http://i133.photobucket.com/albums/q57/taymampfi/CIMG1461.jpg

http://i133.photobucket.com/albums/q57/taymampfi/CIMG1462.jpg

Answer 1

If it's starting to collapse, i'd say tear it down and put up a new one. Or,call an exterminator.

Answer 2

You are highly allergic, call a professional dont take the chance of getting stung