Typically, ice skating rinks include a waterproof liner and a batter-board around the perimeter of the liner. To construct the rink, the batter-board is assembled on a flat, smooth surface. The liner is laid on the surface and draped over the batter-board (Sumobrain)

Batter boards are the starting block for your home or building so that all of your walls will be square. If your batter boards are not square or level, it will throw your whole foundation off. (The BBQ report)

Excavating for a foundation will disturb the stakes, so batter boards are set up outside the boundary established by the stakes to preserve definite and accurate building lines. (mydiscounttools.com)