The disk can be found at Crevasse Dam, on a desk in the main building.
Thea: Lenny just had to have those eggs. I told him to leave the damn things alone because we didn't know what the hell laid them. But that greedy bastard didn't listen and now we're being stalked by mama deathclaw. She's already killed two of the gang, dragged them off to who knows where. And Lenny? Yeah, he ran away. Didn't even try to put up a fight. Now the deathclaw is back, and I doubt the rest of us will make it through the night. So thanks a lot, Lenny. I hope those goddamn eggs were delicious, because they cost us our lives.