 Two years later, the city proposed closing the first nine holes of Langston Golf Course and building a $10 million public aquarium on the site, but the National Park Service refused to turn over the land to the city.In 1965, the city again asked permission to turn Kingman Island into a landfill.Although this plan was not approved, the city did begin dumping environmental trash (such as grass cuttings, leaves, and tree stumps) on Kingman Island at this time.