I did my own pond, which is about 1 1/4 acre in size with a 7' average depth. Deepest point 18'. I had a 955 Cat highlift dozer and a dump truck. Two years later I hired two excavators and 3 more dump trucks and finished it in a week.
Nothing against your particular tractor, but with it's size, try to figure out how long it will take you to move roughly 9000 cubic yards of dirt. Also, don't forget that you have to move the dirt to a particular location. Just guessing, I'd say that you can get about 1/5th to 1/4 of a yard per heaping bucket load. So, that will take you roughly 40,000 bucket loads to get your pond done. Don't forget that once you start getting some depth, it will take some effort to get out of the hole with a bucket full. Assuming that you only have to travel an average of 75 yards to dump each load (and not allowing any time to level out your piled up dirt), you should be able to get about 1 bucket load of dirt moved every 4 minutes. That would give you 15 bucket loads moved per hour if you took no breaks. That would net you about 3.5 cubic yards of dirt moved per hour. That would take you nearly 26000 hours of tractor time only moving the dirt out of your hole. You would then have to start doing something with that dirt. Add another couple thousand hours for that.
Therefore, I'd venture to guess that based upon the given facts and statistics, you'd likely wear out a couple of tractors and it would take several years of non-stop work to do the job with only your CK30. Even with it being a tough tractor, I think 26,000 hours of hard work would be quite a bit to ask of it. /forums/images/graemlins/tongue.gif
Oh yeah, if you are around my area, you'll see me on TV doing a commercial (that apparently plays all too frequently) for the company who finished my pond. I agreed to do some of their commercials for a trade off. /forums/images/graemlins/wink.gif