The lessee shall not sell or remove for use off the premises any timber, stone, gravel, peat moss, topsoil, or any other material valuable for building or other commercial purposes; provided, however, that material may be used, if required, for the development of the leasehold. Any removal of such material from the leasehold shall require written approval from the manager and, for instances involving a commercial quantity, the market value shall be paid to the borough. [Ord. 98-25 §2, 1998; Ord. 84-61-O §10, 1984; Ord. 78-7-O §2, 1978].