Irwin is a refugee living in the Hub. He can be found near Bob's Iguana Bits stand and Beth's weapon store in the Downtown area. If the player talks to him, he will tell them about his problem concerning raiders who invaded his farm. He asks the Vault Dweller to get rid of all the raiders on his property by any means necessary.
If the Vault Dweller agrees to the quest, they'll be transported to Irwin's property (not marked on the map). To complete the quest, the player needs simply to kill all of the raiders in Irwin's house. There are a total of seven moderately armed and armored enemies, each wearing either leather armor or jackets. Overall the raiders aren't excessively powerful, but can swarm the Vault Dweller and overwhelm a low-level character, which is likely what warranted the minimum level requirement.