Subsequent to the placement of GC9AGEN Waldheim Concrete Jungle #1, much to our surpise we discovered another, smaller herd of concrete barriers loose in the wild. After intensive DNA analysis it appears fairly conclusive that the two herds share common ancestors. Our working theory is that these were some old bulls driven out of the larger herd. We are open to alternative theories ... please feel free to suggest such in your logs! 
(Please exercise some caution since concrete and steel may have sharp/rough edges that could be painful for the careless).