1941 PBA was established for the manufacture of mustard and lewisite agents, and for the loading and assembling of incendiary and chemical munitions, including signal smokes and obscurant materials.

At the close of WWII, captured German chemical warfare materiel was sent to PBA for evaluation.

1947 - During disposal of German Traktor rockets, several rockets were propelled from the burning pits.

1950s – 1970s Biological operations were initiated and closed.

1960s - Chemical warfare agent BZ was received and placed into pyrotechnic munitions.

Early 1970s - Only incendiary, riot control, screening smoke, and signaling smoke munitions were produced, along with defensive equipment and operations (such as gas mask rebuild).

1977 - 1992 Twenty-two 15 cm German Traktor Rockets were found at Pine Bluff Arsenal.

1983 - 1992 Thirty 4.2-inch mortars were found at Pine Bluff Arsenal.

1984- 1991 Two 115-lb bombs were found at Pine Bluff Arsenal.

1988 – 1990 All BZ munitions and remaining bulk BZ stock were disposed of by Resource Conservation and Recovery Act (RCRA)-permitted incineration. The old BZ filling facility was decontaminated, and all subsequent tests for agent and contaminants were negative.

1993 Two 8-inch mortars,three 75 mm projectiles, and 1 Livens, MKII were found at Pine Bluff Arsenal.

The installation also serves as a conventional and chemical storage depot. In addition, a number of waste storage, treatment, and disposal facilities are operated onsite in support of the various industrial operations. A total of 72 sites were investigated during the Installation Restoration Program (IRP), with 11 sites having the potential of containing chemical agent contamination.

Investigations were initiated in 1972 and all required remediation completed in 1989. There were 20 sites that required remediation, which was accomplished through the Military Construction, Army (MCA) program. The sites were remediated by one of two methods: in-situ closure using slurry wall and synthetic liner technology, or clean closure, which removed all contaminated material and soils to other appropriate disposal sites.