site                site_code  zone                  lat       lon        data_recorder  date        
West_Agana_Shallow  WAG-S      Reef_Flat             13.48221  144.74618  LJR            2014-01-15  
West_Agana_Shallow  WAG-S      Reef_Flat             13.48221  144.74618  LJR            2014-08-12