Dangerous Radiation Levels Detected in San Francisco

The letter from the health department reads in part, "San Francisco is deeply concerned by both the magnitude of this exceedance and the failure to provide timely notification. Such a delay undermines our ability to safeguard public health and maintain transparency.”

Anthony Megliola, the Navy's Director of the Base Realignment and Closure Program Management Office West, explained in an email to NBC Bay Area that the Navy will provide more information following its meeting with SFDPH on Friday.

Megliola said at that meeting, the Navy will be "transparently sharing the information we have compiled, which demonstrates no threat or risk to human health or the environment. "

NBC Bay Area Investigative Reporter Jaxon Van Derbeken, who has been covering the cleanup efforts at Hunters Point for around a decade, explained, "This is really quite an extraordinary letter sent by [the city], raising these really considerable red flags."

"This is not the first time that tests have come back in ways that the Navy wasn’t necessarily anticipating," Van Derbeken noted.

"When you have zero values or below-zero values, you wonder how they’re calibrating their equipment testing to account for negative values," Van Derbeken noted.