It depends on the code requirement (if your jurisdiction has enacted a code) for where you live. Where I live the minimum-bury code requirement is one foot. (UPC). I am a little puzzled by your question, though. Minimum-bury requirements are for OUTSIDE the structure, and you say this is a bathroom addition. Crawl-space or slab.....no bury requirement at all.
"Where is mom going to the bathroom?"
i think my bathroom sink can hold about 3 cups
Going to the bathroom is a necessary body function. In that respect, going to the bathroom is healthy. It can become unhealthy if you do not use healthy practices, like washing your hands after eliminating.
To say 'He is going to the bathroom' you would say 'Va al baño.'
would going to the bathroom often be a sign of colon cancer
Did you go to the bathroom on his desk, or your desk in your pants or on his face?
Only if you are going to the bathroom a lot due to having severe dysentery or a deadly form of food poisoning.
going to the bathroom
try going to the bathroom
eating and going to the bathroom
they went to the bathroom in a stream that they did not use for drinking water.
No you may not use the bathroom. If you have to use the bathroom you raise your hand and wait your turn! And if you ask again your going to get detention!