As the colony manager at the Reston Primate Quarantine Unit, it is Bill Volt who calls Dan Dalgard to tell him that the monkeys at the facility are dying in unusually large numbers. He also delivers the infected monkey corpses to the USAMRIID scientists and soldiers after Dalgard initially refuses to let them into the building itself. He does not seem to truly understand the gravity of the situation until two of his employees fall ill, at which point he begins to panic (although neither of them ends up getting sick from Ebola).
The timeline below shows where the character Bill Volt appears in The Hot Zone. The colored dots and icons indicate which themes are associated with that appearance.
Part 2, Chapter 1: Reston
Part 2, Chapter 2: Into Level 3
Part 2, Chapter 7: The Second Angel
Part 2, Chapter 9: Garbage Bags
Part 2, Chapter 13: Reconaissance
...cages. Klages thinks that they shouldn’t even be inside without a spacesuit. The men find Bill Volt in his office, and are ill-at-ease, wondering whether that room too is contaminated—they almost vomit... (full context)
Part 3, Chapter 2: A Man Down