Ok, I just spoke to the guys at Ballast. They said the Kolsch recipe posted online is going to get you about 95% of the way there. The only difference is that they use a special kind of kolsch yeast that is not available.
Kolsch (Golden Ale)
6 # pale malt extract
1# wheat malt extract
1/2# 10 L crystal
1 oz Northern Brewer (6.9%) 60 min
1 oz Tettnanger 10 min
1 oz Tettnanger 2 min
Ferment with W.L. California Ale Yeast
If you brew it, post back and let us know what you think.