Separation is required when the capacity of incompatible stored materials exceeds what volume? Calculator 3 lb (1.361 kg) or gal (1.89 L) B 5 lb (2.268 kg) or gal (1.89 L) 10 lb (4.535 kg) or 1 gal (3.78 L) D 20 1b (9.072 kg) or 5 gal (18.92 L)