Office of Environmental Health Hazard Assessment proposes to establish specific regulatory levels posing no significant risk for benz[a]anthracene, benzene, benzo[b]fluoranthene, benzo[j]fluoranthene, bromoform, chrysene, 7H-dibenzo[c,g]carbazole, dibenzo[a,h]pyrene, dibenzo[a,i]pyrene, and 5-methylchrysene and to establish a specific regulatory level representing 1/1000th the observable effect for arsenic.