from the super duper mart, or megaton. continue heading east to farragut west metro station. now follow the river southeast staying on the road. eventually you will come to the anchorage war memorial. (actually you will be able to see it, you won't discover it unless walking towards it) continue following and you will discover tepid sewers. go over the door and walk towards the barricades. in between the barricades is a door. this should be the door to dukov's place.