I have a home that was once a ranch on a slab. A second floor was then added and when that was done, a utility pit was placed under the portion of the home that extended beyond the original footprint. I now need to expand the area of this pit. I want to jackhammer through the slab and dig out a 6-6 area. Could someone tell me the best method to go about this without displacing so mush soild under the rest of the slab that I have problems with settling (I am particularly concerned about the area of the slab that supports the chimney).
Any help is appreciated. If you need more details, let me know. Basically it boils down to how can I dig and brace the soild so I do not upset the area I am not planning to remove.
Thanks, Jon