I've got a house that has one area that stays wet all the time. It might be only a couple hundred square feet. I've pull soil cores and it appears to be thick grey and orange clay. From the core the first few inches are good brown soil and then you hit the clay. Some cores are only 6 inches deep, but some I can "punch" through the clay and get a good 18-20" core. They just had some landscaping done and around the new bushes it is very soupy. It has been wet and cool here so things stay damp a lot longer. I'm figuring the clay was so hard that when digging the holes for the plants it may have created a "bowl" that holds the water. I do know that this area stays damp all year long even in the summer. What can I do to aid in the drainage and loosen the clay? I was thinking that I could just take a few deep core pulls everytime I'm there and over time it would loosen everything up. Didn't know if there was a better approach. Should I fill the holes with sand or peat? I don't have much clay in my area so I'm clueless. Ideas?