Railroad yards, maintenance areas, and fueling areas are areas used for storing, sorting, loading, unloading, maintaining, and refueling railroad cars or engines. Hazardous materials actively or previously used in these areas can include fuel, herbicides for rights-of-way, creosote from preserving wood ties, solvents, paints, and waste oils. If hazardous materials or generated wastes are improperly handled, stored, or disposed of, ground water and surface water can be impacted.