Air Force Plant Peter J. Kiewit and Sons (AFP PJKS,[3] AFP #79)[4] is a Formerly Used Defense Site (CO7570090038) at the Colorado Front Range and used during the Cold War (1957-1968) to provide "rocket assembly, engine testing, and research and development"[2]) for the Titan missile complexes southeast of Denver (construction began April 1959).
Entirely within the East Fork Brush Creek watershed,[6] the former USAF firearms ranges used by PJKS military police remains along the creek, is managed by the Skyline Hunting and Fishing Club,[7] and is used for periodic Jefferson County police and local Boy Scout training.
HGM-25A Titan I ICBMs were liquid-fueled rockets using LOX/RP-1 propellant which required the missiles to periodically be removed from the launch silos for servicing.
Environmental sites at PJKS include 59 within six operable units (e.g., OU1, OU4, & OU6), and there are six areas of concern (12 of 14 underground tanks have been removed).
In fiscal year 1996, "technical work groups were formed with EPA, the State of Colorado, USGS, and the U.S. Army Corps of Engineers to support RI site characterization and risk assessment.