Gaspeddler, and all, I'm familiar with the State of Georgia's marker's for test wells. They look very much like the one you are showing. I worked for a Delco-Remy plant in Albany with the Environmental Dept. for twenty years before they closed the plant. We had three test wells around the plant, and always passed thankfully. After the plant closed we "capped" the wells with a lockable device and placed that type marker on them for future testing. The company, whomever they are now, will have to pay a contractor to monitor these wells annually for twenty years after closure, reporting to the state. The battery plant I was transferred to is another story.