"It is used for the card reader at the disposal facility."
The Card Key, is an Umbrella employee exclusive key card that is used to unlock certain portions of the Disused Plant. Jill Valentine, finds the card key in Resident Evil 3, while fighting Nemesis in a treatment room that is designed to dispose of B.O.W.s. After defeating Nemesis, the card key will slide out of a lab coat of a deceased scientist in the waste disposal room. Once she grabs the card key, she must use it to escape from the room before all the waste inside the room is disposed. This door was locked, when Jill enters the room and the message reads: "It is electronically locked."Jill can use the Card Key in other places in the Disused Plant; she can use it to activate a lift leading to the Material storage. This elevator is located in the Power room. When inactive, the elevator's message reads: "The elevator won't move because it is locked with a Card Key." She can also use it to open a shutter leading to the Control room, that is located in the facility entrance. Locked shutter reads the message: "It is electronically locked.".
Every locked door or elevator has the card reader near it with a message "There is a Cark Key reader.". The Card Key must be used at this card readers.
After using the keycard three times, Jill will asked if she wants to discard it. It is not necessary to activate the elevator, leading to the weaponry basement to complete the game.
- BIOHAZARD 3 LAST ESCAPE OFFICIAL GUIDEBOOK. Famitsu. 1999.