We have received 3+ inches of rain the past three days. Today I noticed a small amount of water in our old well room. The water is coming in through the concrete floor where a small piece on concrete has popped out. The piece is about the diameter of a fifty cent coin and about a quarter inch deep at its greatest depth. Any ideas for how to fix the area that would be waterproof and stop the leak? Thanks for the Help.

I'm trying to remove a boulder from my basement. The house was built around it (who knows why), and the boulder is about 7 feet long X 5 feet wide X 4 feet high and slightly irregularly shaped. My thought was to drill holes into the boulder, pour in an expanding material to crack the boulder, and then jackhammer it into smaller pieces so that I can carry them out. Issues: the boulder is wider at the top than the bottom, the boulder is only about 3 feet from a post holding up the house the boulder sits on slightly sloping ground My big worry is that in trying to break up the boulder, its centre of mass might change, and it might shift or roll into the post. There's no way the post can be removed, so I need to somehow brace the boulder. I was thinking I could build up support around the bottom of the boulder before starting the process, but this could be quite a bit of work in itself. Any other ideas?