Getting machines to do the work would've increased that cost significantly & not to mention destroying the shrubs. We instead used our might and dug down.
We kept digging and digging just to get this photo --- not really, but you can see we were about 7'-8' down under.
Here was the crack that caused all the water issues
We applied a special tar like coat to the surrounding area. Then a heavy mil plastic and then a thick plastic panel (I forgot to take the pic)....
...and then we sealed the edges with the sealant.
The End - :)