Close to the place where the helicopter crashed you will find captain Dave Carlson attacked by few dogs. Save him and speak to him. You will get from him information about Santa Fe. He will command your team to find lieutenant Woodson who is responsible for the radio station. You may also try to treat him using the Surgeon skill, however it will not be a much of a help since his time is already coming to an end.
You will find Woodson in the building located in the middle of this area. He will be attacked by a pack of mutated dogs. Once you will save him he will ask your team to secure the Santa Fe area, what requires filling holes in the wall around this place. In result no more mutated dogs will be able to get inside. To complete this quest you have to use boards which you can find outside of the building (compare to screenshot). Until the radio is disabled you can speak to Woodson to receive promotions.
Go with boards right from the Woodson's building until you will get to the wall's first hole. You will also find few dogs during your walk. Use boards on the hole to fill lit. After that turn left and go along the wall filling every hole and exterminating every group of dogs you will find. After every repair Woodson will use the radio to broadcast recordings of local groups to let you know what you may encounter in California. There are five holes in total. You will walk around the entire area, and the last hole you will find near the gate, close to the place where you have started the game.
After you will secure the entire wall Woodson will ask you to visit Carlson who does not have a lot of time ahead. You will find Carlson in the near warehouse. You can ask him about his team's mission. After your conversation you will receive the gate key which you can use to get deeper into the California and meat your old friends - repeater units, which you have to install on local transmitters to increase the Rangers' signal and contact with the base in Arizona.
Related to quests:
- Help Rangers' base in Santa Fe Springs;
- Secure the area in Santa Fe Springs