(1) Distance to limit concentration levels arising from flammablegas or vapor dispersion(2) Distance to limit concentration levels arising from toxicgas or vapor dispersion(3) Distance to limit overpressure levels arising from explosions(4) Distance to limit heat flux or heat dosage levels arisingfrom pool fires(5) Distance to limit heat flux or heat dosage levels arisingfrom jet fires(6) Distance to limit heat flux or heat dosage levels arisingfrom fireballs