This Outline of Investigation for Nonmetallic Tanks for Oil-Burner Fuels and Other Combustible Liquids, Subject 2258, covers nonmetallic or composite primary, secondary and diked type atmospheric storage tanks from 60 - 660 gallons (227 - 2500 L) intended primarily for the storage and supply of heating fuel for oil burning equipment, or alternately for the storage of diesel fuels for compression ignition engines and motor oils (new and used) for automotive service stations, in aboveground applications.