 While grasses are already beginning to grow through cracks in the runways, the agency would prefer not to wait as aircraft continue to make illegal landings at the refuge, disturbing the birds, despite markings on the runways themselves and on aviation charts of the area indicating that the facility is closed.It has not yet determined how this will be done in the most environmentally sensitive fashion.Similarly, it hopes to restore the original stream pattern through the property by removing the culverts and other reroutings made during construction of the airfield.