we started this project last week. It is a CSA farm (community supported agriculture) on Shelter Island. They had an irrigation well that had the tank above grade but they wanted frost free hydrants for the green house and the farm stand. So we had to cut down the well casing and removed 10' of drop pipe and had a vault installed. then re-installed the tank and re-piped for the 4 frost free hydrants and the line for the 6 seasonal risers to feed drip for the crops.