This location is due west of abandoned mine shaft 1, at the end of the southwest spur off of Route 84. It is one of the most southwestern locations on the map.
There is a weapons workbench outside of the concrete control and maintenance building. The small building has minor loot and a locked room with a duffle bag and a mattress. West from the location is a small derelict encampment with an old trailer and a Grafton Steel truck. Directly south is a cult's sacrificial altar.
Hornwright testing site 2 appears in Fallout 76.