Uhhh, how 'bout you call a professional.
Some of the previous responses are the same funny stuff that MY customers tell me. Internet myths.
Right now is the breeding season for skunks. SHE is probably under the slab foundation, since it was poorly made. SHE won't come out unless the males can't get to her. SHE will attract every male in the neighborhood. You may have to catch a bunch of males before you catch HER.
The males will fight, bite and spray each other to get to HER. Then they will bite at HER to breed HER, whereas SHE will also spray.
As you may have noticed, the FEMALE is the problem (aren't they all

)
Mothballs, music, ammonia and lights don't work.
Trapping with an already covered cage works the best. Relocate if legal (most states are not legal due to rabies vector), euthanize is preferred. Shooting WILL cause an essence release in my experience.
I may be able to find you a contact for nuisance wildlife in your area, but anyone licensed with an established business will be able to help you.
And yes, I do this for a living in CT.
http://animalevictions.com/skunk