Doug Deeping is an NPC involved in the The Dig Site quest. He will give players a key which may be used to open the chest containing chemical powder. He will give an unlimited number of keys as long as you drop them first. Once the quest is complete, he will not offer any more keys.
His name is a pun, as it can be pronounced "dug deep", humorous due to his location at the Digsite, full of people digging deep holes. Interestingly, he has a pickpocket option but cannot be pickpocketed.
He can be found by going down the northeast winch in the digsite area.