ON 08/03/91, A SEVERE STORM CAUSED RUNOFF TO TAKE A SUBTERRANEAN ROUTE, UNDERMINING THE ASPHALT PAD WHERE 14 ABOVE GROUND 12,000 GALLON STORAGE TANKS WERE LOCATED. ONE OF THE TANKS CONTAINING WING DE-ICING FLUID, FELL AGAINST THE CONCRETE WALL SURROUNDING THE TANKS, BREAKING A PIPE AND CAUSING 2,857 GALLONS OF 24% ETHYLENE GLYCOL TO SPILL INTO A DRAINAGE DITCH 200 FEET SOUTH OF SAND CREEK. THE DISCHARGE WAS NOT PERMITTED. THE PROPOSED CIVIL PENALTY IN THIS ACTION IS $10,000.