The US Army needs to get rid of old explosives near its new artillery ammo plant. They're too dangerous to move, so it's blowing them up.

• The US Army will detonate 68 barrels of unstable explosive material at an ammunition production plant.
• Officials determined the lead azide couldn't be relocated and are in contact with residents on environmental concerns.
• The facility is also home to the Army's new 155mm artillery production line, which began construction earlier this year.

The US Army will detonate dozens of barrels of unstable explosives at its ammunition plant in Iowa after determining the material couldn't be safely moved, according to a public affairs official.

The lead azide the service needs to get rid of has been stored at the site for almost 20 years and is no longer needed for ammunition production. The detonation will occur near the service's new 155mm artillery production line, construction of which began in July.

The Army informed residents of nearby Middletown, Iowa, this week that it would detonate 68 barrels of lead azide sometime in November. Army Explosive Ordnance Disposal teams will execute the detonation.

"There are 68 barrels of lead azide in two earth-covered magazines, and that material was on site for potential production," Justine Barati, deputy director of public affairs for the US Sustainment Command, told Business Insider. "When we realized that we would no longer need that material or use that material, then it becomes hazardous waste."

A team of experts recommended a controlled explosion to destroy the lead azide, and that decision was elevated to former Army Secretary Dan Driscoll for approval.

Barati said the 155mm facility is on the other side of the Iowa Army Ammunition Plant. The Army anticipates a four-hour delay to construction at the facility on the day of the detonation.

The Army asked Middletown residents near the plant to temporarily leave their homes and is offering the Army Reserve Center as a place to stay during the detonation.

About 55 homes are expected to be affected by the detonation decision, Barati said. Local residents can assess any property damage afterward and file claims with the Army. The Iowa newspaper The Hawk Eye first reported on the detonation and town hall with residents.

Lead azide is a highly sensitive and toxic material used as a primary explosive component in some weapons that can pose environmental and health risks. Barati said that prior to and after the detonation, the Army will test air, water, and soil in the area. Residents agreed to give the service access to their properties for the checks.

The Iowa Army Ammunition Plant is a critical production facility for medium- and large-caliber munitions. Earlier this year, the Army began construction of a new production line for 155mm ammunition, replacing the plant's World War II-era M795 artillery production line.

The new facility was designed by the Army's Combat Capabilities Development Command's Armament Center and MSM North America to produce different types of 155mm ammunition with the capacity to surge manufacturing for wartime demands.

155mm artillery shells have become a high-demand munition amid recent conflicts. The US has ramped up production after providing millions of rounds to Ukraine. Concerns about the state of US ammo stocks have risen as the military assesses its readiness for future wars.