1. No permit of removal of earth material shall be used for a period of more than
1. No permit of removal of earth material shall be used for a period of more than one (1) year in a Residential District or more than three (3) years in a Non- Residential District, although such a permit may be renewed for additional -66- periods in the same manner as for initial issuance. Where the duration of the permit exceeds thirty (30) calendar days the Special Permit Granting Authority shall require a bond or other security to ensure compliance with its conditions of authorization, unless, in a particular case, it specifically finds that such security is not warranted and so states in its decision, giving the reasons for its finding. Where the duration of the permit is thirty (30) calendar days or less, the Special Permit Granting Authority may, in its discretion, require such security as hereafter set forth for all special permits.