While this is old, I will mention this for the next guy hunting for advice:
The following is worth a try, especially if this is an erratic problem.
* Remove all shrubs from the foundation area.
* If needed replace window well with deeper ones, or put in ones where the sill is close to the ground.
* Put in a wedge of clay a foot high and 8 feet wide against the foundation wall.
* Put down a layer of 15 mill plastic. Don't cheap out on this.
* Put down ornamental gravel.
This takes the water further from the house.
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Where does water come off your roof? Can it get back to the foundation. A 50 foot coil of non-perf weeping tile fastened to a down spout will take water a long way from the house. Put it about 3 feet above the bottom of the down spount. You can bury the tail but leave the end open. Plant a water loving tree like a birch there.
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