DRF No . - 96051 5 Distribution List - Environmental Managemen t Name Dept Bldg R . C . Ama r 022-000 T03 8 P . 0 . lindino 41-nn(R14 M . J . Gabler 030-000 T038 P . H . Horton 022-000 T038 M. 022-000 T038 R D Le e Mcyc r N . Miilrharja s P S . _(il cnn Encl Name DATE : 10/08/9 6 Dept Bldg Enc l 022-000 T038 641-000 SS14 [122-nnn Tfl R_ ❑00 any g T, C?miicl c R Ct ne e (124-flnfl Tf~ R 022-000 003 8 T0-- * P . D . Rutherford 641-000 T436 DRF Control 026-000 T038 Symbol * indicates temporary addition to standard lis t File Name : ERWM No . of Copies 1 4 mii imiim i m U I DI muiBNA03479855 HDMSP001869636 Ei959i51-4 F1[C ENU~-ti . MGM' . 499 nci OCT cii 'alt', 1 :' :` .. ' Department of Energy Oakland Operations Office 1301 Clay Street, N70 0 Oakland, CA 94612-520 8 Majello Jensen Program Manager Environmental Program s Energy Technology Engineering Center Rocketdyne Division Rockwell International Corporation P .O. Box 793 0 Canoga Park, CA 91309-793 0 Subject: Completion of Projects Outside of DOE Are a Dear Ms . Jensen : There are three facilities, owned by Rocketdyne, that were used to support Department of Energy nuclear research programs during the early 1950's to late 1970's which are located outside the DOE portion of Area IV . These facilities were surveyed for radiological contamination and subsequently decontaminated by the Department of Energy . Achievement of the decontamination goals was documented in the form of final surveys by Rocketdyne and verifications by the California Department of Health Services for unrestricted release . o Old Conservation Yard From 1952 until 1977, the OCY and surrounding land areas were used for the storage of excess equipment , some of which was contaminated with either uranium or mixed fission products . The 1988 radiological survey of the OCY identified elevated concentrations of Cs-137 in soil, with assumed equivalent concentrations of Sr-90 . The source of contamination was believed to have been the result of an undocumented contaminated liquid spill . The area was investigated to delineate the areal extent of contamination (400 sq ft x 6 in depth) for remediation . A Cs-137 clean-up guideline was established using the DOE computer code RESRAD . Contaminated soil was excavated, and post-remedial action measurements and sampling were performed . DHS performed a verification survey and issued a statement releasing the property for unrestricted use . o Building 373 - This facility was used for the first SNAP reactor criticality tests from 1957 to 1963 . All SNAP components were removed at the completion of the program . A radiological survey was performed for removable alpha and beta activity . The measured activity was far less than the acceptable limit of 1000dpm/sq cm, therefore it was concluded that the facility was not contaminated . This facility was released for unrestricted use by DHS on May 9. 1995 . BNA0347985 6 HDMSPOO1869637 8 1 858651 94 ETEC ENUIRB . MGMf . 499 P3 OCT i1 '96 5 2 o Building 009 - The Organic Moderated Reactor and Sodium Graphite Reactor critical test facilities were operated in adjacent high bays in Building 009 . During their operation , there were no incidents of contamination . When the programs ended , all associated equipment was removed . Later, some additional test work was done in a laboratory in this building . It resulted in some radioactive contamination in the liquid waste holding tank system which was later removed . The Department behaves that its responsibilities for decontamination of these facilities has been completed . We request your concurrence that these facilities met the unrestricted release requirements, have been verified by Cal OHS, and DOE's responsibility has ended Please sign three copies of this concurrence , retain 1 copy for your file , and send Z copies to me . Sincerely , Michael Lopez ETEC PM Environmental Restoration Divisio n bC~ Majelle 'J s~tT, Manager Environmental Program s Steve Lafflarn, Division Director Environmental Health & Safety mii imiim iim 01 00 II I OI muiBNA03479857 HDMSP001869638