I found another well on the property

I can see Lupine growing around that well. They will bloom in May-June

 

yeah your contaimenent was I believe coliform.. or feces.. very easy for animal poo to be deep in dirt water contacts it on way up... why in VT they require a steel casing until 80 feet or bedrock.. basically most bacteria need light and air to multiply not much of either at that depth..
well type might be regional thing.. I think what you really have is a improved spring.. where water naturally comes to ground level... someone dug out and put a catch basin in to collect water and a cap to keep debris out.

 

Yes, they are perennial. However, the old plants die off after a few seasons and new ones replace them from the seed they drop every year. They spread around easily if the conditions are right. Main colors of the wild ones are shades of blue, some pink and some white. Sometimes they are all blue, but out of nowhere, a white or pink one will pop up. Lupine are among my favorite flowering plants.

 

My well tiles are made of clay, old school, about as big around as yours. About 12 feet down, the tiles down size and there is a 2 inch lip. At that lip is a seam were the water comes into the well when the level is drawn down this time up year. In the wet seasons, winter until summer, the water level is up 6 or 8 feet above that seem and doesn't drop even with heavy pumping.

 

We have Lupines as well, my wife puts them in flower beds. Our area, and yours, is loaded with them. Very beautiful. The state plants them in the highway mediums.

 

That would be great! I haven't shot clays in decades. I used to have a Trius Trap that somehow disappeared. Never figured that one out. Kids might have had a hand in that one.

 

In this area, lupines usually are loaded with aphids. I found that out after transplanting some from the wild into a garden I had.