Had around 16 beers on Friday night ended around Saturday morning at 3am. I have a UA on Tuesday at 6:00pm. Will I be OK? I think it's roughly 82 hours since last drink.

Even though its 82 hours since your last drink... add a hour for each beer. That's 66 hours. Doesn't matter when you stopped drinking really. Your liver produces ETG until your BAC hits 0. I have no idea over how many hours it took you to drink that... so you were eliminating ETG from the time of your first drink. You are in a real bad spot even if you add 5 or 10 hours from BAC 0.. Not looking good for a pass. That's a lot of alcohol and there's no study on how long that's detectable.

Do you remember when you had your 1st drink that day? Also, your height/weight, age, etc would be helpful.

If you drank over a several hour period, I suspect that you may be fine. Saturday at 3am to Tuesday at 6 pm is 87 hours. I suspect that you didn't drink all 16 beers at the same time. Even if you did, you will have about 71 hours after BAC 0. It will be in your favor if the cutoff is 500 or higher. Be certain that you are well hydrated prior to testing and that you void about 1 hour or so prior to submitting your sample. Your latest urine will have less EtG.