Pueblo Chemical Agent-Destruction Pilot Plant

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Army's Explosive Destruction System (EDS) and/or other explosive destruction technologies (EDT), at the U.S. Army Pueblo Chemical Depot in Colorado. The EA was withdrawn and a new EA was completed in 2012. The new EA focused on the use of EDT for destroying overpacked and reject munitions. In April 2013, Program Executive Officer Conrad F. Whyne announced his selection of EDS to augment the Pueblo Chemical Agent-Destruction Pilot Plant for the safe destruction of chemical munitions unsuited for processing by the main plant's automated equipment. In Spring 2018, the decision was made to end EDS and utilize three Static Detonation Chamber units to augment the main plant.

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In June, operators at the PCAPP EDS took things up a notch with the introduction of 4.2-inch mortars into the destruction process. The first three mortars were joined by three 105 mm projectiles. All were safely detonated in the vessel on June 18. On July 16, the first 155 mm projectiles from Pueblo’s stockpile were safely destroyed in the PCAPP EDS. The PCAPP EDS completed its first campaign in February 2016, destroying 549 munitions that leaked or were sampled in the past and 11 bottles containing mustard agent. The second and final campaign ran from June 25 to Dec. 5, 2018.

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environmental assessment concluded that the installation and operation of an explosive destruction technology will have no significant environmental impacts. A draft Finding of No Significant Impact was prepared and provided for public comment for a 60-day period. It was concluded that no additional analysis was necessary for the proposed action under NEPA.

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the nation's declared destruction programs. The Program Executive Office, Assembled Chemical Weapons Alternatives (PEO ACWA) oversaw the destruction of the chemical weapons stockpile in Colorado and now is managing destruction of agent-contaminated secondary waste in Kentucky and closure related activities in Colorado and Kentucky.

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PCAPP operations resumed on Jan. 12, 2017. Under the purview of the Colorado Department of Public Health and Environment, the agitators were removed from one of the hydrolysate storage tanks, and the openings were sealed with blind flanges. Additionally, the liners, from the floor and part way up the

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The PCAPP EDS started destruction on March 18, 2015, with the elimination of Department of Transportation (DOT) bottles which contained chemical agent drained from selected munitions over the years to assess the condition of the stockpile. On April 8, the first munitions were successfully processed.

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Destruction of this stockpile was a requirement of the Chemical Weapons Convention, an international treaty to which the United States is a party. The Organisation for the Prohibition of Chemical Weapons (OPCW) is the implementing body of the Chemical Weapons Convention and monitored the progress of

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From July to September 2017, PCAPP temporarily shipped wastewater off site for treatment and disposal at the Veolia Environmental Services Hazardous Waste Incinerator, in Port Arthur, Texas. The wastewater, known as hydrolysate, is the product of the neutralization of chemical agent at the plant. A

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Construction continues with interior and exterior work ongoing in multiple buildings, including the Agent Processing Building, Control and Support Building, Enhanced Reconfiguration Building, Biotreatment Electrical Building, Multipurpose Building, Filter Press Building, PCAPP Medical Clinic, Entry

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Preparations at the SDC site began in June 2019. The first Static Detonation Chamber components arrived at the depot on Aug. 6, 2019, in a convoy of more than a dozen flatbed trucks. Assembly began Oct. 31, 2019. Protective, tension fabric coverings were erected around each unit, with construction

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PCAPP operations were paused on Nov. 20, 2016, due to an industrial hazardous waste spill of approximately 450 gallons of hydrolysate. The spill was associated with a seal failure of one of the agitators located on the side of a hydrolysate storage tank. On Nov. 23, an unrelated, second issue was

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On Sept. 7, 2016, operations began at the PCAPP. The plant began destroying the stockpile of chemical weapons at the U.S. Army Pueblo Chemical Depot in Colorado. The plant is utilizing neutralization followed by biotreatment as the technology to destroy munitions containing more than 2,600 tons of

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To meet the requirements of the NEPA and Title 32 Code of Federal Regulations Part 651, ACWA, in conjunction with the U.S. Army Pueblo Chemical Depot, completes an environmental assessment regarding the possible use of explosive destruction technologies in Pueblo. Following a public comment period

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On April 18, 2013, Program Executive Officer Conrad F. Whyne announces his selection of the U.S. Army’s Explosive Destruction System (EDS) to augment PCAPP. The decision followed a lengthy review of several explosive destruction technologies designed for the safe destruction of chemical munitions

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The Pueblo Chemical Stockpile Outreach Office was established in 1997 to serve as the community’s primary information resource on chemical weapons destruction in Colorado. The staff responds to inquiries, provides information materials, coordinates guest speakers for a variety of different civic

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Closure is the final phase of the project, coming after chemical weapons destruction operations have been completed. Closure encompasses planning, preparation and disposal of agent-contaminated and non-contaminated secondary waste; facility and equipment decontamination; and decommissioning and

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In 2010, the Pueblo Chemical Depot, in conjunction with the ACWA program, completed an environmental assessment (EA) to meet the requirements of the National Environmental Policy Act, or NEPA, and Title 32 Code of Federal Regulations Part 651 regarding the construction and operation of the U.S.

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donor explosives wrapped around the munition. The resulting off-gasses are processed through secondary treatment to ensure agent destruction. Examples of detonation technology include the Transportable Detonation Chamber, or TDC, and the DAVINCH (Detonation of Ammunition in a Vacuum-Integrated

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On June 16, 2023, the main plant at PCAPP destroyed its last munition, a 4.2-inch mortar round. On June 22, 2023, the last munition in the stockpile of chemical weapons in Colorado, an overpacked 155 mm projectile containing mustard agent, was destroyed using a Static Detonation Chamber.

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In April 2012, Pueblo Chemical Depot and ACWA completed an environmental assessment to meet the requirements of the NEPA, and Title 32 Code of Federal Regulations Part 651, to address any potential impacts of the installation and operation of explosive destruction technology at the depot. The

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PCAPP construction is more than halfway complete, with interior and exterior work ongoing in multiple buildings, including the Agent Processing Building, Control and Support Building, Enhanced Reconfiguration Building, Biotreatment Electrical Building, Entry Control Facility, Immobilized Cell

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After an assessment of problem munitions showed that their destruction would be difficult using neutralization and biotreatment, ACWA decided to explore use of Explosive Destruction Technology (aka Explosive Demolition Technology, Explosive Detonation Technology, EDT) for these projectiles.

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On Nov. 13, 2018, PCAPP moved one step closer to full operations when the staff initiated Integrated Facility Demonstrations. Within the first 24 hours, the plant experienced its highest throughput, the rate at which munitions are processed, to date. IFDs successfully concluded on May 3,

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Construction began and was completed on the PCAPP EDS site, located at the U.S. Army Pueblo Chemical Depot in 2014. The first of two EDS units arrived on site, aligning with the completion of specially-designed environmental enclosures that will house the EDS units for added

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discovered; rainwater had leaked through the liner of the secondary containment system surrounding the Brine Concentrator Feed Tanks. These tanks hold the effluent produced in the Immobilized Cell Bioreactors and are essential to the operation of the biotreatment process.

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Provisional Operations, a two-month period in which operations and maintenance staff practice training with simulated munitions and agent, began at the PCAPP in 2014. This extensive training is conducted on a large-scale to ensure employees are better prepared for plant

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Due to performance issues identified during the first year of pilot testing, and in order to complete destruction of the stockpile by 2023, this technology was chosen to augment the main plant under a proposal by the ACWA program. To meet the requirements of the

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On July 27, 2022, PCAPP recognized the End of the 105mm Projectile Campaign marking the end of the second destruction campaign in the main plant. Community members joined government officials and project staff to recognize the chemical weapons destruction

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Chemical stockpile destruction in Colorado was initiated on March 18, 2015, by the EDS, located on the U.S. Army Pueblo Chemical Depot near the PCAPP. This event marked the first step towards eliminating the final 10 percent of the U.S. chemical weapons

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in southeastern Colorado. The stockpile originally contained 2,613 U.S. tons of mustard agent in 155 mm projectiles, 105 mm projectiles and 4.2-inch mortar rounds. The weapons had been stored at the 23,000-acre (93 km2) depot since the 1950s.

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demolition of facilities in accordance with public law and U.S. Army direction. In addition, personal property is dispositioned, real property is returned to PCD (Pueblo Chemical Depot), environmental permits are closed and the contract is closed.

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On Feb. 19, 2022, chemical-agent destruction began at the Pueblo SDC complex with the processing of a portion of the 4.2-inch mortar rounds. SDC operations marked the beginning of the third and final chemical weapons destruction campaign at PCAPP.

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On Feb. 11, 2016, the EDS successfully completed its first destruction campaign, eliminating 265 105 mm projectiles, 196 155 mm projectiles, 88 4.2-inch mortar rounds and 11 Department of Transportation bottles for a total of 560

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In April 2013, Program Executive Officer Conrad F. Whyne announced his selection of the U.S. Army’s EDS to augment the PCAPP for the safe destruction of chemical munitions unsuited for processing by the main plant’s automated equipment.

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On Feb. 19, 2022, the Pueblo Static Detonation Chamber complex began agent-destruction operations, destroying 4.2-inch mortar rounds. SDC operations marked the beginning of the third and final chemical weapons destruction campaign at

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The systemization phase begins at the PCAPP. Construction teams turn over the first subsystems to the start-up groups for systemization testing and commissioning to begin to prepare the facilities for chemical weapons destruction

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Destruction began in 2016 and concluded June 22, 2023. The plant will conduct closure activities (shutdown, dismantling and restoration of site) for three to four years past conclusion of destruction operations.

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On June 22, 2023, the last munition in the chemical weapons stockpile stored at the Pueblo Chemical Depot, an overpacked 155 mm projectile, was destroyed in the plant's Static Detonation Chamber complex.

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On April 12, 2018, PCAPP ordnance technicians started the Baseline Reconfiguration process for the 4.2-inch mortar rounds. At the end of this campaign, more than 97,000 of these rounds will have undergone this

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PCAPP is formally notified by the U.S. Department of Labor's Occupational Safety and Health Administration (OSHA) that the PCAPP project was re-certified as a Star Worksite under OSHA's Voluntary Protection

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the munition and destroy the agent and energetics. The resulting gases are treated in an off-gas treatment system. The Static Detonation Chamber, or SDC, is an example of thermal destruction technology.

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On April 1, 2019, PCAPP announced the achievement of a significant milestone - the elimination of a quarter (25%) of the mustard agent stockpiled in chemical weapons in the Pueblo Chemical Depot.

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During the summer of 2020, PCAPP set monthly munitions processing records. In June, 14,126 munitions were processed, 15,440 were processed in July, and 19,033 munitions were destroyed in August.

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affirms to Congress that there are no options by which the U.S. can destroy 100 percent of its chemical stockpile by the extended Chemical Weapons Convention treaty deadline of April 29, 2012.

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mustard agent. Additionally, the Army’s EDS, is on stand-by to augment the main plant to destroy problematic chemical munitions that cannot be easily processed using its automated equipment.

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On Sept. 8, 2017, agent destruction operations were paused at PCAPP due to higher than anticipated amounts of solids being washed out of munitions and clogging agent neutralization systems.

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In September 2022, enhanced equipment added to the main plant enabled previously rejected projectiles to be re-introduced into the main plant’s automated robotic destruction system.

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In September 2017, PCAPP marked its first full year of the pilot testing phase in which the plant destroyed 253 U.S. tons of mustard agent and 42,897 155 mm projectiles.

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On March 29, 2024, PCAPP moved into its final stage, closure, following approval of its main plant closure plan by the Colorado Department of Public Health and Environment.

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On March 29, 2024, PCAPP moved into its final stage, closure, following approval of its main plant closure plan by the Colorado Department of Public Health and Environment

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conducted studies to evaluate potential impacts of the elimination of these weapons using incineration and non-incineration methods. Four technologies were considered:

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Robotic equipment removed energetics (explosives) from the weapon, including the fuze and the burster. The energetics are disposed of at a permitted facility off site.

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On Feb. 15, 2018, PCAPP ordnance technicians reached a plant milestone when the last of more than 28,000 105 mm projectiles went through Baseline Reconfiguration.

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The mustard agent was mixed with hot water. The resulting mixture was neutralized with a caustic solution. The byproduct was called hydrolysate. The hydrolysate was

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Control Facility, Laboratory Facility, Immobilized Cell Bioreactor, Brine Reduction System, Off Gas Foundation Pads and Munitions and Energetics Service Magazines.

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On Sept. 15, 2021, PCAPP reached the destruction milestone with more than half (50%) of the 105 mm projectiles stored at the Pueblo Chemical Depot destroyed.

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PCAPP used neutralization followed by biotreatment to destroy the majority of the stockpile, and Static Detonation Chamber technology to augment the main plant.

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In September 2020, the first munitions campaign at PCAPP was completed with nearly 300,000 155 mm projectiles stored at the Pueblo Chemical Depot destroyed.

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The Pueblo Chemical Stockpile Outreach Office permanently closed to the public in 2023, but staff continues to be available at pueblooutreach@iem.com.

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As of April 2021, PCAPP had destroyed 390,000 projectiles, accounting for half (50%) of the original U.S. chemical weapons stockpile stored in Colorado.

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On April 27, 2017, the Biotreatment Area at the Pueblo plant began processing hydrolysate, which is the product of the neutralization of mustard agent.

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On May 25, 2023, PCAPP received the final delivery of mortar rounds from the U.S. Army Pueblo Chemical Depot. Delivery of all munitions is complete.

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Review and Assessment of the Proposals for Design and Operation of Designated Chemical Agent Destruction Pilot Plants (DCAPP-Pueblo): Letter Report

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Public Laws 110-116 and 110-181 are enacted, mandating destruction of the chemical stockpile by April 2012 or in no case later than Dec. 31, 2017.

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Pueblo Ordnance Depot (later redesignated as the U.S. Army Pueblo Chemical Depot) begins storage of chemical weapons containing mustard agent.

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As part of systematizing the facility, Assembled Chemical Weapons Alternatives Test Equipment, or ATE, arrives for practice and training use.

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On June 12, 2018, agent destruction operations resumed after required modification to the Agent Neutralization Reactors were completed.

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groups and organizations and interfaces with the governor-appointed Colorado Chemical Demilitarization Citizens’ Advisory Commission.

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and federal regulations, an Environmental Assessment was conducted. A Finding of No Significant Impact resulted from the assessment.

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and does not require disassembly of the weapons. There are three general types of technologies that can destroy chemical weapons:

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Occupational Safety and Health Administration Voluntary Protection Program Star Status award in recognition of safety excellence.

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On July 20, 2022, the second munitions campaign at PCAPP was completed with more than 383,000 105 mm projectiles destroyed.

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On June 23, 2020, PCAPP ordnance technicians completed the Baseline Reconfiguration process for the 4.2-inch mortar rounds.

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Metal parts were heated to 1,000 °F (538 °C) for 15 minutes for thermal decontamination and were then recycled.

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On March 31, 2023, PCAPP completed destruction of more than 20,000 4.2-inch mortar rounds filled with HT mustard agent.

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On Dec. 1, 2022, PCAPP began destroying 4.2-inch mortar rounds in the main plant using Improved Cavity Access Machines.

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On June 30, 2021, PCAPP destroyed 75% of the mustard agent stockpiled in chemical weapons at the Pueblo Chemical Depot.

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In July 2019, PCAPP exceeded destruction of half the 155 mm projectiles in the Pueblo Chemical Depot stockpile.

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On May 24, 2023, PCAPP began destroying overpacked 4.2-inch mortar rounds in the Static Detonation Chamber units.

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In 2015, the Bechtel Pueblo Team earns recertification of Star Status in the OSHA's Voluntary Protection Program.

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On April 8, 2023, PCAPP began destroying 4.2-inch mortar rounds filled with HD mustard agent in the main plant.

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In February 2020, PCAPP exceeded destruction of half of the agent stored at the Pueblo Chemical Depot stockpile.

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The project’s environmental permitting information is available for review during regular business hours at:

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In May 2019, PCAPP successfully completed the third and final round of background sampling for pilot testing.

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On Dec. 12, 2012, PCAPP declares construction complete and moves into the systemization phase of the project.

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The inside of the weapon was remotely accessed and mustard agent was washed out with high-pressure water.

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The Department of Defense accepts the final design for the Pueblo Chemical Agent-Destruction Pilot Plant.

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EDT uses heat and pressure from explosion or just heat to destroy the munitions; it is not considered

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treaty, which directs all member nations to destroy their chemical weapons and production facilities.

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On June 16, 2023, the last munition, a 4.2-inch mortar round, was destroyed in the PCAPP main plant.

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Design work and preliminary construction is suspended pending evaluation of cost reduction measures.

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chemical neutralization followed by supercritical water oxidation and gas phase chemical reduction

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In September 2022, the closure contract for the Pueblo plant was awarded to Bechtel National Inc.

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and extensive review by Department of Defense leadership, the environment assessment is withdrawn.

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As of Sept. 27, 2021, a half-million projectiles containing mustard agent were destroyed at PCAPP

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On Dec. 11, 2020, PCAPP began its second destruction campaign with the 105 mm projectiles.

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In spring 2018, PCAPP announced a proposal to procure three Static Detonation Chambers (SDC).

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Detonation technology – destroys the majority of the agent and explosive in the munition by

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walls of the secondary containment system around Brine Concentrator Feed Tanks were removed.

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In June 2020, assembly of the plant's three Static Detonation Chamber units was completed.

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Program Executive Office, Assembled Chemical Weapons Alternatives (February 10, 2015).

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Program Executive Office, Assembled Chemical Weapons Alternatives (December 15, 2016).

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As of Aug. 13, 2021, more than 2,000 U.S. tons of mustard agent was destroyed at PCAPP.

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PCAPP redesign is approved by the Department of Defense and construction work resumes.

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Thermal destruction – uses the heat of the electrically heated containment vessel to

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Bioreactor and Off-gas Foundation Pads and Munitions and Energetic Service Magazines.

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Above-ground vertical construction begins with erection of the Multipurpose Building.

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total of 52 truckloads safely transported 236,473 gallons to Veolia for disposal.

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On Aug. 28, 2022, Ryan Williams became the new Pueblo plant Principal Deputy.

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Program Executive Office, Assembled Chemical Weapons Alternatives (PEO ACWA)

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Program Executive Office, Assembled Chemical Weapons Alternatives (PEO ACWA)

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The water was recovered for reuse in the destruction process and the excess

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was secured in containers for disposal at an off-site permitted facility.

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responsible for the destruction of the U.S. chemical weapons stockpile.

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https://www.peoacwa.army.mil/pcapp/environmental-activities-at-pcapp

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Pueblo Team is awarded a contract to design, build and operate PCAPP.

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Additional information is also available on the following websites:

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external links, and converting useful links where appropriate into

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Program Executive Office, Assembled Chemical Weapons Alternatives.

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Program Executive Office, Assembled Chemical Weapons Alternatives.

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Program Executive Office, Assembled Chemical Weapons Alternatives.

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to open the munition and consume the explosive in the burster and

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Systemization was completed and operations began on Sept. 7, 2016.

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