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"Forget the Rest" blog

Material Disposal Area (MDA) A (1), (2)

Table B-1

Location:  Technical Area (TA) -21

Period of use:  1944 to 1947, 4/69-7/76
Tanks (2): 1945-1946

Pits (3): 1944-7/46 (two)and 4/69-7/76 (one)
Size:  1.25 acres

Number and type of disposal units:
Tanks:  12 feet in diameter and about 63 feet long

Pits (2):  15 by 100 by 12 feet, containing an estimated 35,988 ft3 of materials

Other pit (1):  150 by 40 by 22 feet, containing 76,460 ft3 of materials
Specific wastes and quantities:
Tanks: Contain 185,000 liters of radioactive liquid, 334 grams of plutonium-239 (239Pu) and 1,108,150 grams of nitrate (NO3-)

Pits (2):  Include unknown quantities of polonium-189 (189Po) or 185Po and 239Pu

Other pit (1):  Includes demolition debris contaminated with unknown quantities of 239Pu, 238Pu, 235U and other unknown radioactive isotopes
Potential environmental impacts:
DP Canyon, Los Alamos Canyon
New Mexico Environment Department's (NMED) Hazardous and Radioactive Material Bureau (HRMB) ranks this MDA as an area with a high probability of contaminant mobilization and a moderate to high potential of release to the groundwater.

Figure B-2 has been removed due to illegibilty.


1.  Rogers, Margaret Anne, History and Environmental Setting of Los Alamos Scientific Laboratory Near- Surface Land Disposal Facilities for Radioactive Wastes (Areas A, B, C, D, E, F, G, and T).  June 1977.  (Back to Text)

2.  LANL, Environmental Restoration Program, TA-21 Operable Unit Resource Conservation and Recovery Act (RCRA) Facility Investigation (RFI) Workplan, LA-UR-91-962.  May 1991.  (Back to Text)
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