Read the damn rules!
Depends on how much alcohol you consumed, but combining CNS depressants like alcohol and benzos can result in a black out and in the worst case increased respiratory depression and death. Just don't do it, it's not worth the risks.
It's impossible to say how much valium is safe when you're "drunk" because there's too many variables to consider. What do you weigh, what's your body fat %, how fast do your kidneys clear stuff from the blood, how quickly do the enzymes in your liver work, personal genetics, how much you drank, etc etc etc
10mg might be safe or it might make you very sick. No way to tell.
Just generally don't combine Benzos and Alcohol, period. I know a lot of people do it but it is one of the most likely way to end up in a cell or the ER with serious consequences for your social life, work etc.
Not to mention that it potentiates the addiction potential of both substances and wrecks your GABA receptors.