I live in a 70 year old home that has a few leaks in the foundation along the back wall. There is a concrete wall along the back wall that is 36" high where earth comes up to about 16" on the outside. The issue is that they used 4x4 blocks at the bottom of the concrete wall for some reason and now they leak a small amount of water around them. Should I just tar the outside of the wall or try to remove the wooden blocks and fill with cement?