National Nuclear Security Administration
June 28, 2006
The Honorable A. J. Eggenberger
Defense Nuclear Facilities Safety Board
625 Indiana Avenue, N.W.
Washington, D.C. 20004-2901
Dear Mr. Chairman:
Your March 7, 2003, letter requested that the National Nuclear Security Administration (NNSA) undertake flood mitigation measures at Technical Area (TA)-18 related to possible flooding after the Cerro Grande fire, including hydrologic modeling as well as implementing maintenance and inspection procedures for the Pajarito Flood Retention Structure. On May 21, 2003, NNSA responded to the Board’s letter with a commitment to take specific actions and provide a follow-up memorandum regarding their status.
The enclosed correspondence package submitted by the NNSA Los Alamos Site Office (LASO) and Los Alamos National Laboratory (LANL) provides documentation of the status of the flood mitigation measures and the Flood Retention Structure at TA-18. I believe that the LASO and LANL actions discussed in the enclosed correspondence adequately address your concern with the Flood Retention Structure.
If you have any questions please contact me or have your staff contact Michael Thompson of my office at 301-903-5648 or Gerald Schlapper, LASO Senior Safety Advisor at 505-665-7111.
Thomas P. D’Agostino
for Defense Programs
cc: E. Wilmot, LASO
M. Whitaker, DR-1