It's going to be a tough one, but all you have to do to get this settlement is take down the Mirelurk Queen.
If you follow the main storyline quests, the Brotherhood of Steel will arrive here and take out the enemies in the settlement.
The Brotherhood of Steel inhabits this area later. South of the East Boston Preparatory School, north of the Prydwen. Plenty of Tato plants are already planted and ready to harvest. South of Red Rocket Truck Stop, east of Wicked Shipping Fleet Lockup.
