[widgeon13]

There are some pretty good hydraulic cements available at your local hardware store. I have used one (can't remember the name, starts w/ D) and it has helped my problem. They are fast drying and you can only work a small part of a crack at a time. Material has to be mixed with water and expands as it dries. Necessary to clean out the crack and widen it to get some area to apply the cement. Might be worth a shot before calling in an excavation company to put in curtain drain and seal from the outside. If it's not that deep, consider doing it yourself w/ some rental equipment.