year   month  sampling  location   block  
2015   6      3         Boundary   1      
2015   6      3         Boundary   2      
2015   6      3         Boundary   3      
2015   6      3         Boundary   4      
2015   6      3         Boundary   5      
2015   6      3         Boundary   6      
2015   6      3         Boundary   7      
2015   6      3         Boundary   8