Amir, depending on what you learn on the infiltration, you may need something like this installed around the exterior to relieve the hydrostatic pressures on the walls and act as a drainage plane against those walls. The older "french drains" solutions may not ideal or up to the tasks and most certainly do not counter the hydrostatic pressures. Some drainage solutions also go inside on the interior vertical planes.
Given the infiltration rate you've shared, any retrofit solution should be sized properly by an engineer.
Disclosure: I have no affiliation with AWD. I have used and recommended their products in the past.
https://www.awd-usa.com/drainage-applications/residential-basements
+++ thoughts your way!
Given the infiltration rate you've shared, any retrofit solution should be sized properly by an engineer.
Disclosure: I have no affiliation with AWD. I have used and recommended their products in the past.
https://www.awd-usa.com/drainage-applications/residential-basements
+++ thoughts your way!