When grading, grubbing, and stockpiling permits expire

(a) Every grading or grubbing permit shall expire and become void by limitation, unless the work permitted therein is started within 90 days after the date of issuance; if the work is suspended or abandoned at any time after the work is commenced for a period of 60 days; or one year after the date of issuance of the permit. Before such work can be recommenced, a new permit shall first be obtained to do so and the fee therefor shall be the fee as specified in § 18A-2.4 . Permit fees for an expired permit even if no work has commenced shall not be refunded. (b) Every stockpiling permit shall expire and become void one year after the date of issuance and all stockpiled material temporarily stored on the premises shall be removed from the premises or used on the premises as fill material under a grading permit for fill before the expiration date. Upon written application, the chief engineer may grant extension or renewal for an expired stockpiling permit. In granting such extension or renewal, the chief engineer may attach such conditions as deemed appropriate to prevent the creation and maintenance of a nuisance or hazard to individuals and property. Permit fee for extension or renewal shall be the fee as specified above. )