20 concrete encased, non-metallic storage containers for commercial, industrial and agricultural use and for use in storing environmental contaminants, namely, fuel, waste oil, anti-freeze, chemicals and flammable liquids; concrete storage containers and concrete support bases therefor for use in storing environmental contaminants, namely, fuel, waste oil, anti-freeze, chemicals and flammable liquids; and plastic inserts for use as industrial container liners for industrial tanks