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Your solution depends on the soil on which the slab sits.
I, for one, can't tell exactly what your soil conditions are but that's the job of a Foundation or Excavation Contractor. You can find them around. You need to start looking in the YELLOW PAGES for contractors that are 'experts' in foundation repair. And I mean THAT'S the type of Pro you want. I would only consider a General Contractor (of sorts) ONLY if they can give you at least 2 references. If you're having difficulty finding a Foundation or Excavation Contractor, ask your Municipal Inspector or Engineer for some names. Be SURE not to 'alarm' them with where you live. Just be polite and tell them you'd like to have someone look into your 'problem', where you may not even have one. Kinda like research. (Tell them everything is fine.)
You can stop by some job sites, ask an Architect (in the YELLOW PAGES) or ask a Structural Engineer (in the YELLOW PAGES) to see if they, or someone they know, can do this job.
Now, as far as you dripping problem, if the drip is at the handle or on the 'nut' that holds the valve on, you'll need to replace the washers. REPLACE BOTH OF THEM. (I'm assuming you have a Gate Valve. You know, the valves w/the 'rounded gate' wheels.) If, however, the leak is at a soldered joint or from a pin hole, you have work that may require a call to a Plumber, unless you or your hubby is up to it.
My best to ya and hope this helps.
Jay J -Moderator
PS: Yes, it will cost $$$ to have your home fixed. Talk to your Insurance Company too. Oh, you may hear the Contractor talk about piers. They're a good thing in unstable soils ...