Go to the Waste Dump on the eastern-most river on the map (just look for the large icons on the map). Once you reach the dump, search for a cave guarded by Deathclaws. Clear the Abandoned Waste Dump cave and enter the bunker interior. Complete the puzzles to unlock the location of the Enclave Vault. Travel to the Enclave Vault and accept their faction quest. Note: Before beginning the Enclave faction quest, you need Level 3 Lockpicking/Hacking skill. The Enclave will send you to a new location. Go to Sugar Grove and destroy the robot guardian. Collect the tape from the Sugar Grove terminal, then return to the Enclave bunker to turn in the quest item and join the Enclave faction.