We built my 15 16 acre pond in the middle of winter, 3 yrs ago, usually that would not be a preferred timeline but it worked out great for us, the frost was not a problem, we started when there was only a small amount of frost in the ground and set it off to to the side and used it on the back slope when thawed, other then that he most likely wont be working equipment when it is near zero, he cant the dirt will freeze to his blade and bucket. I would definitely not condone trying to work the dam when there is frozen chunks of ground present. the water can be an issue but I put a 4" drain line in the bottom of the pond for water removal and then just closed the valve on it after construction was completed, and now I have an awesome water source behind the pond to fill a tank or anything to water gardens, trees or even animals. wouldn't build one without it, plus by putting a watering pipe through it in this area qualify s it as a agricultural pond for livestock watering and the government is waaay more lenient to farms and farming requirements then they are for pleasure ponds.
Keep in mind that the size pond you are talking about for that amount of money will be completed in a couple days, as compared to the three weeks we were working on mine, he can hit a window of nice weather and have it completed before the next front moves in.
My point being I would not at all be afraid to let him do his thing, it worked perfect for us, I just completed a pond in late Dec for a customer, obviously we have had extremely nice weather here locally and it was just a few day project, there was no frost in the ground under the sod and no harsh weather predicted for a week so we finished it in no time before the weather took a turn. Its our free time, most winter we don't expect to be doing anything but shop maintenance in the winter months.

Last edited by gehajake; 01/14/22 11:56 AM.

All the really good ideas I've ever had came to me while I was milking a cow.