Good luck guys. It doesn't sound like an easy job by a long shot.

http://www.oxfordcroquet.com/care/worms/index.asp

"Dew Worms

Dew Worms
Many people complain about the presence of dew worms in their yards, and their lumpy lawns.
Dew worms are ‘Nightcrawlers’ or Lumbricus terrestris. They live deep in the ground, with vertical burrows as long as 2.5 meters, and can live up to 9 years. They come up to the surface to eat plant litter, and also to cast off soil and waste products (resulting in the mounds on your lawn).
These are a few things you can do to reduce the damage they cause.
1. Remove the thatch on your lawn, as this disturbs the burrows.
2. Water the lawn less frequently, about every 10 days, will drive them deeper into the ground.
3. Top dressing the soil with sand, as this irritates the worms.
If you are planning an event and want a quick fix, you can roll the lawn with a heavy roller (available from rentals companies), power rake it, and let it dry."

http://prairiescapes.blogspot.com/20...dew-worms.html (bottom of page)