Rockbreaker's Last Gas

Rockbreaker's Last Gas
The Rockbreaker's Last Gas is a ruined gas station in the western Capital Wasteland. It is located north of Everglow National Campground, south of Five Axles Rest Stop and east of Vault 87 and Broadcast Tower KT8. This area is also a random encounter area. There is also an Enclave outpost nearby if you have proceeded to that point in the main quest.

You should first obtain the victory rifle in the shack and then use it to destroy the vehicle underneath the gas station tripod structure. This will cause an explosion that takes out a few enclave soldiers or at least a scientist. The rest can be picked off at your leisure with the rifle!

You can usually find a Nuka-Cola Quantum on top of a Nuka-Cola machine inside the fenced area. Due to movements of NPCs and creatures, it may have been knocked over.(Note: it is not inside the nuka-cola machine. Every nuka-cola machine has a chance to spawn a quantum. Any inside are coincidental, and the other can be found somewhere).

Abandoned Shack
In the abandoned shack at the top of a cliff to the west of Rockbreaker's is the 4th of the Keller Family Transcripts and the Victory Rifle. There is also a copy of Dean's Electronics in the shack, inside a box on a shelf, as well as a copy of Guns and Bullets on a table.

Also, watch out for enclave forces if you go there after you have completed the Waters of Life quest.