If, in the judgment of the Director of Inspection Services, said surety bond is insufficient for a particular blasting operation, specified in a particular permit, they may require the filing of a bond in an additional sum, conditioned as above, but limited to blasting operations in the locality specified in the permit. (Ord. 4089-NS § 1 (part), 1965: Ord. 2833-NS § 2 (part), 1947: Ord. 1309-NS § 3.1, 1927)