Del. Code tit. 7, § 7210

Any person whose interest is substantially affected by any action of the Secretary or of the Department taken pursuant to this chapter, may appeal to the Environmental Appeals Board as established by § 6007 of this title within 20 days after the announcement of the decision. Such appeal shall be governed by §§ 6008 and 6009 of this title. There shall be no appeal of a decision by the Secretary to deny a permit on any matter involving state-owned subaqueous lands.