My guess is you didn't cool the sample before taking your Original Gravity reading. You probably got 1.030 at about 170 degrees or whatever your sample was it, you need to temp correct that to 60 degrees, so it would be more like 1.055 or so, a good starting gravity.
Your final gravity is probably correct at 1.016, although that is a bit high for a wit, it might need to ferment a bit further.
Anyway if my theory is correct you would have about 5.5% alcohol. But if you do have 16% ABV you will sure as heck taste it!
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