Rocky Flats Plant,
HAER No. CO-83-H (Rocky Flats Plant, Building 762)
Note: The documentation for Building 762 also represents other guard posts used to
control access to the protected area, including Buildings 372, 792, and 764, which
housed equipment for the perimeter intrusion detection assessment system used to detect
activity within the perimeter security zone.
Rocky Flats Environmental Technology Site, Highway 93, Golden, Jefferson
County, Colorado. Building 762 is located north of Building 762A, inside the protected
This building is a primary contributor to the Rocky Flats Plant
historic district, associated with the U.S. strategy of nuclear military deterrence during
the Cold War, a strategy considered of major importance in preventing Soviet nuclear
attack. As the Cold War continued and concerns and fear escalated, security was tightened.
In 1983, a perimeter security zone was constructed around the protected area to enhance
protection of plutonium operations. Security personnel use Building 762 to control
vehicles entering into the protected area.
Building 762 is a concrete structure with tubular aluminum sections
and asbestos panels to sill height of the windows on three sides. The roof is concrete on
metal pans. The building is approximately 25 by 25 feet (625 square feet). A vehicle trap east
of the building has electric gates on the north and south ends of the road cut through the
double fence of the perimeter security zone. Buildings 372 and 792 are similar in
construction and size to Building 762.
Building 764 is approximately 20 by 50 feet (1,000 square feet), concrete with a flat roof.
This structure is located northwest of Building 762, inside the Protected Area. Electronic
equipment and computers used to run the perimeter intrusion detection assessment system
was housed in Building 764.
Building 762 was constructed in 1983 as part of the perimeter security
zone, a $5 million project to surround and secure the plutonium operations at the plant.
Three access points, also referred to as portals, are located in the perimeter security
zone. Building 762 (Portal 1) is the only entrance point for vehicles going into the protected area. Building 372 (Portal 2) located south of Building 371, is the exit
point for vehicles, and Building 792 (Portal 3) located north of Building 771, is for
pedestrian access only. All three portals allow entrance and egress for pedestrians.
To enter the protected area, until 1989, an employee placed their badge in a drawer to
pass it into the guard posts to a member of the protective force for a badge check. The
badge was returned and the employee entered the area through a metal detector. Upon leaving the
protected area, an employee displayed their badge to the protective force member on duty
As the Cold War continued and concerns and fear escalated, regulations and requirements
were implemented to tighten security. New requirements included more advanced special
nuclear material metal detectors for people and x-rays of property
entering and exiting the protected area. A second larger access control post was built at
each of the portals to accommodate the upgraded equipment and badge-check functions.
Once the new larger access control posts were built in 1989, the original security
buildings were no longer needed to provide badge check function. At Portal 1,
security personnel scrutinize all vehicles with
radiation monitoring and detection equipment prior to entering the protected area, and search the vehicles for prohibited
equipment and materials (Cunningham).
Cunningham, Steve, employed at the plant since 1977 by the
site contractor. Personal communication, September 1997.
Richmond, Lou, employed at the plant since 1970 by the site contractor.
Personal communication, August 1997.
United States Department of Energy. Final Cultural Resources Survey Report (1995), by Science Applications International Corporation. Rocky Flats Repository. Golden,
United States Department of Energy. Site Safety Analysis Report, Notebook
13-Security (1995), by EG&G Rocky Flats, Inc. Rocky Flats Repository. Golden,
D. Jayne Aaron, Environmental Designer, engineering-environmental
Management, Inc. (e2M), 1997. Judith Berryman, Ph.D., Archaeologist, e2M,
Index to Photographs
Located north of Building 762A, inside the protected area, Golden Vicinity, Jefferson County, Colorado.
Photograph by Timothy McGrath and Katherine T. Abeyta, Source One, site photography
contractor, summer 1997.
CO-83-H-1 – View looking north at the south elevation of Building 762. Building 762, Portal 1, is one of three pedestrian access points into the protected area surrounding plutonium operations. Portal 1 is also the entrance for all vehicles entering the protected area.