hi ,
new to the forum and would appreciate some feedback on water accumulation around the foundation of our walkout basement and possible mitigation for it.

The house is in Toronto, On. I have attached the side view drawing of the house and as you can see, there is a decent walkout basement area. The solid line is the current grading and underneath it is the basement area. the interlock in the walkout area was redone recently but after we dug a pit the house ( where the 2nd basement window is in the drawing), there is a large accumulation of water underneath the weeping tile (about 12 inch below the floor of basement). it was dug deeper (~ about 4 ft) and we
still didn’t get to the bottom of the concrete foundation.

We pumped out the water in the pit to the level as shown in the 2nd picture and it doesn’t seem there is water filling up the hole (it has been 2 days).

I suspect that the current weeping tile is connected to the sump pump in the basement inside the house. Since there is nowhere water can go below it, water just sit there since the soil underneath couldn’t absorb it.

We are little bit concern about the concrete foundation being submerged in water, causing damage. The house is about 15 years old. One contractor suggested that we install a sump pump where the hole/water is and pump out extra water as required. I am concerned about the related maintenance of the pump since we have to put a cover back and worry about the freezing winter here.

Do I need to worry about water at the frost wall below the weeping tile since there is no living space behind it? Will the freeze damage the concrete?
will frost heave take place since the backfill is mainly gravel stone?

really appreciate your feedback!