In the event that a gasoline station is determined to be abandoned as provided above, the owner, operator and motor fuel supplier of said gasoline station will be responsible for immediately removing the tanks, gasoline pumps, all identification signs and lighting poles and for painting the exterior, if other than brick, a neutral color. In lieu of removing the tanks, said responsible parties shall remove the Class I liquids therefrom and fill all tanks with water for a three-month period only and, thereafter, with a solid material. They shall also provide adequate protection against unlawful entry into the buildings and on the property and shall close all vehicular entrances to the property to prevent storage of abandoned vehicles thereon.