In fallout 3 where is the key to the springvale cellar door in on of the ruins of a house in springvale?

To get the Springvale cellar door key in Fallout 3 you must not have destroyed Megaton. Complete the ‘Take-It-Back’ quest and activate the purifier before doing the ‘Holy Water’ quest. Next, speak with Scribe Bigsley inside the Jefferson Memorial or go to Megaton to see a NPC called Rosa speaking with a water begger. Talk to Rosa to learn the 'Holy Light Monastery' location. Go there and talk to Brother Gerard. Irradiate yourself at the altar to get the key from him or kill him and take it.

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