An injection well is located approx. 12 yards behind my house. When I discovered it, I had the practiced ceased. I've since noticed a
- Crack in the patio slab behind my house. An addition is beginning to separate, at the same line
- My front porch slab is such now that I can begin to see the footers of the house
- The cinder block mid support of the house is separated from the house (e.g. The floor joist of the house are no longer attached touching...
- My front and back porches are showing signs of separating from the house.
- There is also extensive pumping of water from a plum under my house
Question: The company responsible for injecting behind my house claims that in injecting they were "raising my water table."
I suspect that the house has in fact raised rather than lowered from the injection as would be evidenced from the separation of the supports. What would be the effects of the injections on my home structure?
I had always been under the impression that injection wells were hundreds or even thousands of feet deep. I assume this injection well behind your house concerns water injection to stimulate production from a petroleum reservoir. Although water injection apparently contributed to movement along the Golden Fault in Colorado, it seems more difficult to imagine how an injection well could directly bow-up your foundation at the surface. Do you have any expandable clay, smectitie, in the soil on which your house is built? Cracked slabs, heaved foundations, and offset walls are characteristic of the shrink-and-swell phenomena of swelling clay. These sequences are common as interbeds in limestone and often represent seawater alteration to clay of the silicate minerals in volcanic ash. Foundation degradation from swelling clay is a common problem in Texas and some areas around Denver. Best, Sandin http://sedward.home.netcom.com/petrography.html