Chemistry and Chemical Disasters. In relation to the storage of liquid dangerous goods, means a basin, pit, excavation, hollow, or enclosure constructed of concrete, brick, clay, earth, or similar incombustible material, and which is of such a nature and construction that it will effectively retain the liquid dangerous goods in the event of their leakage outflow from their container under the action of fire or from any other cause; and 'to compound' has a corresponding meaning