Segment 5 History
 

Segment 5 is located in the northeastern portion of the 300 Area Decision Area and borders the IU-2/IU-6 Area Segment 3 to the north, State Route 10 and the IU-2/IU-6 Area Segment 2 to the west, the Horn Rapids Road and 1100 Area to the south, and the Columbia River and the 300 Area to the east. The area within the Segment 5 boundaries covers approximately 137 km2 (53.01 mi2). 

There were no significant Manhattan era radiological operations performed in majority of the geographic area that is included in within the segment 5 outer boundaries. However, there are numerous areas within the outer boundaries that were excluded in the transition to LTS because of ongoing or planned cleanup, other Hanford Site activities, and non-DOE activities.

These excluded areas that did not transition to the LTS program include sites where active cleanup has not been completed, sites where cleanup is still in progress or sites where active Hanford operations are still in progress. These exclusion areas include the Hanford Patrol Training Academy (PTA), the Fast Flux Test Facility (FFTF), the Fuels and Materials Examination Facility (FMEF), Volpentest Hazardous Materials Management and Emergency Response Training and Education Center (HAMMER), Cold Test Facility (CTF), 400 Area Percolation Pond Sewer System and remediation waste sites 618-10 and 618-11.  Also, the areas of land used for the Energy Northwest’s Columbia Generating Station and the Bonneville Power Administration (BPA) electrical substations were not transitioned to the LTS Program. These excluded areas cover approximately 42.7 km2 (16.5 mi2).

Cleanup efforts in Segment 5 started in 1995.  Facility removal and demolition were documented as early as 1984 and continued in 2012.

Prior to 1943 (pre-Hanford), historical activities within Segment 5 included farming and homesteading. These activities were primarily in the south end of Segment 5 and in the vicinity of the 300 Area.  Other areas of Segment 5 consist mainly of sand dunes, which typically are inhospitable to farming activities.

The archaeological record of Native American occupation at the Hanford Site stretches back thousands of years. Typical Hanford archaeological sites include pit house villages, open campsites, fishing sites, hunting/kill sites, game drive complexes, quarries and spirit quest sites.