Any external leakage should also be taken care of with either grading corrections, curtain drain
or some sort of effective waterproofing.
A curtain drain
, as defined in Chapter 3701-29 of the Ohio Administrative Code (Household Sewage Disposal Systems, 1977), is any subsoil drain used to prevent the entrance of groundwater into the area occupied by the household sewage disposal system.
The basement that exists today, protected by a curtain drain
and a sump pump, was completed soon thereafter, 27 years late.
If you decide on a curtain drain
, stop laying the stones about a foot from the top of the trench, lay a landscape fabric over the stones and top it with a couple of inches of coarse sand.