During a rainy season a crack in a basement wall can allow an inch or two of water in but before you seek to repair the crack remove all the water from the floor.
Removing drywall from a concrete basement wall.
Use a pry bar or your hammer claw to pull them out just like you would with nails.
How to remove sheetrock mud from concrete floor.
With this mixture scrub well in and around the damaged area.
Finally disinfect with a bleach solution and ventilate the basement dry once again.
Clean mold off walls by scrubbing the area thoroughly with a bristle brush after about ten minutes to help to lift any residual mold out of the pores in the concrete.
Carefully inspect the room for other vestiges of mold.
Then rinse with clean hot water and soak up the moisture with the wet dry vacuum cleaner.
Screws to install the drywall snap them off with your hammer.
Chip away the chunk of sheetrock mud from the floor using the plastic putty knife.
Put on a dust mask to protect yourself from the particles.
Scrub any sheetrock mud residue.
Drywall screws are brittle so if some joker used 3 in.
Mix dish soap and water in the small bucket 1 part soap to 5 parts water or as indicated on soap packaging.
Saturate the walls with the peroxide then let it sit for up to 30 minutes.
Or you can leave a 4 inch gap between the studs and concrete wall and probably get away with it.
Tape a one foot by one foot square of plastic sheeting plastic kitchen wrap will do to the concrete wall in your basement with duct tape and leave it in place for 24 hours.
Allow any dust you have kicked up to settle and replace the bag if you.
That is if the studs are going to touch the concrete wall.
Then remove the tape.
Most jurisdictions require a 4 mil plastic sheet vapor barrier for basement walls against concrete.