Don't mean to pop your bubble by saying its impossible but . . . an excavation of that size in cubic yards makes me stop and think to mention is it worth the "wear and tear on my equipment" fuel and how about my cost per hour? I did one dig about 4 years ago not a pond but a complete cellar hole under an existing 26' x 42' house dug down to 9'. The house had a 2' dirt crawl space which turned to mud because of an underground water problem, There was so much ground water and mud that it compromised the concrete wall holding up the house. We cut into the wall, dug a ramp down to what would be floor level and comenced digging with my brand new Mahindra 2810HST and KK 30" dirt scoop on the rear. I guess it took 50 continous hours of my digging while the boys shored up under the house to keep it standing. We did a complete poured wall under the house and saved the house from collaspe. The amount of dirt that i brought out from that hole i dug seemed to never end but it finally did. Would i do it again? . . .No Way! simple reason my neck, i started thinking i was an owl with 360 degree swivel. Only reason i did this was it was my uncles house and family does for family. One thing i can say is it was a 50 hour test for my brand new tractor and it passed beautifully. Thinking of this project makes me rethink how i'm going to clean and redig my own pond. RENTAL EQUIPMENT! Here are some pic of the cellar dig . . .John