Any public agency with authority to approve or deny port projects that result in the filling of subtidal habitats within the ocean ports of California or habitats in the water of inland ports of California shall approve, as mitigation for those fill projects, any subtidal or in-water mitigation project proposed by the port authority that the public agency determines provides appropriate and adequate mitigation for the adverse impacts on the affected subtidal or in-water habitat in a manner consistent with other law that is then existing.