# Release of Feasibility Study/Proposed Plan (FS/PP) for Cleanup of Radiological Contamination at the St. Louis Downtown Site (SLDS) for Public Review > Briefs, arguments, decisions, and more. URL: https://www.frixlaw.com/law-library/documents/fr%3A98-10359 ## Record - **Collection:** Federal Register - **Document type:** Notice - **Published:** April 20, 1998 - **Citation:** 63 FR 19476 ## Text DEPARTMENT OF DEFENSE Department of Army Corps of Engineers Release of Feasibility Study/Proposed Plan (FS/PP) for Cleanup of Radiological Contamination at the St. Louis Downtown Site (SLDS) for Public Review AGENCY: U.S. Army Corps of Engineers, DOD. ACTION: Notice. ----------------------------------------------------------------------- SUMMARY: The St. Louis District, U.S. Army Corps of Engineers (USACE), in consultation with the U.S. Environmental Protection Agency (EPA), propose to cleanup contaminants resulting from past uranium processing operations at the St. Louis Downtown Site (SLDS). SLDS is one of several being addressed under the Superfund law (Comprehensive Environmental Response, Compensation, and Liability Act [CERCLA]. Alternatives, which identify the range of cleanup options, have been developed and evaluated in the SLDS Feasibility Study (FS). USACE has identified Alternative 4 as the preferred remediation alternative [[Page 19477]] described in this Proposed Plan based on the information available at this time. The final decision on the remedy to be implemented will be documented in a Record of Decision (ROD) only after consideration of all comments received and any new information presented. FOR FURTHER INFORMATION CONTACT: Questions regarding the SLDS FS/PP may be directed to Mr. Chris Haskell, U.S. Army Corps of Engineers, St. Louis District, FUSRAP Project Office, 9170 Latty Avenue, Berkeley, Missouri 63134, by phone (314) 524-3334, or by e-mail at ``Chris.Haskell @MVS01.usace. army.mil''. SUPPLEMENTARY INFORMATION: 1. Proposed Action The U.S. Army Corps of Engineers, St. Louis District, issued the SLDS Feasibility Study/Proposed Plan (FS/PP) for public comment on April 8, 1998. The site became contaminated as a result of activities in support of the nation's early atomic energy program in the 1940s. The sites are being addressed under the Formerly Utilized Sites Remedial Action Program (FUSRAP). Cleanup of these sites is now managed by the U.S. Army Corps of Engineers. The alternatives evaluated in the Feasibility Study are summarized in the Proposed Plan. Inaccessible soils are not included as part of the operable unit. 2. Project Alternatives a. Alternative 1--No Action. Mandated by the Comprehensive Environmental Response, Compensation, and Liabilities (CERCLA), periodic environmental monitoring would be conducted, but no remedial action would be conducted. b. Alternative 2--Institutional Controls and Site Maintenance. Institutional controls and site maintenance would be implemented to prevent unacceptable exposures to site contamination. c. Alternative 3--Containment. Alternative 3 incorporates containment, institutional controls, and environmental monitoring to reduce further spread of contaminants and reduce the potential for direct exposure. Under this alternative, accessible soils from SLDS and vicinity properties would be excavated and consolidated and capped at a downtown location such as the City Property or Plant 2 area. d. Alternative 4--Partial Excavation and Disposal. This alternative includes excavation of accessible soils in the upper 2 feet to the composite criteria of 5 pCi/g in surface soil (top 6 inches) and 15 pCi/g in shallow subsurface soil (top 2 feet) (for Ra-226, Ra-228, Th- 230, and Thj-232) and 50 pCi/g for U-238. Site-specific dose and risk- based target removal levels of 50 pCi/g Ra-226, 100 pCi/g Th-230 and 150 pCi/g U-238 would be used for excavation of soils below 2 feet for most site areas. e. Alternative 5--Complete Excavation and Disposal. This alternative involves excavating soil contaminated above the composite criteria regardless of depth. f. Alternative 6--Selective Excavation and Disposal. This alternative focuses on reducing the need for future studies, designs, and remedial actions, in addition to protection of human health and the environmental relative to Alternative 4. It is anticipated that excavation to the composite criteria would proceed to a depth of 6 feet of the St. Louis Terminal Railroad Association tracks and the former locations of Buildings 116, 117, 704-707. Excavation for the composite criteria would stop at 4 feet at all other areas at SLDS including the vicinity properties and under the roads. The Corps of Engineers has identified alternative 4 as preferred. 3. Scoping Process Federal, state and local agencies, and interested individuals are invited to participate in the scoping process to determine the range of issues and alternatives to be addressed. The U.S. Army Corps of Engineers will hold a public meeting to receive oral and written comments at the Henry Clay Elementary School Gymnasium, 3820 North 141th Street, St. Louis, Missouri 63107 on April 21, 1998 from 7:00 p.m. to 9:00 p.m. In addition, written comments will also be accepted until May 8, 1998 by Dr. R. L. Mullins at U.S. Army Corps of Engineers, St. Louis District, FUSRAP Project Office, 9170 Latty Avenue, Berkeley, Missouri 63134, (314) 524-4083. 4. Availability of FS/PP Copies of the FS/PP are available for review from April 8, 1998 until May 8, 1998 during business hours at the following locations: U.S. Army Corps of Engineers, St. Louis District, FUSRAP Project Office, 9170 Latty Avenue, Berkeley, Missouri 63134 St. Louis Public Library, Government Information Section, 1301 Olive Street, St. Louis, Missouri 63103 Henry Clay Elementary School, 3820 N. 14th Street, St. Louis, Missouri 63107 Prairie Commons Branch Library, 915 Utz Lane, Hazelwood, Missouri 63042 Washington University Library of Biological Sciences, One Brookings Drive, St. Louis, Missouri 63130 Julia Davis Branch Library, 4415 Natural Bridge, St. Louis Missouri 63115 St. Louis County Library, 1640 S. Lindbergh Blvd., St. Louis, Missouri 63131 The FS/PP is also available for review on the world wide web at http://144.3.144.51/engr/fusrap/index.htm. Gregory D. Showalter, Army Federal Register Liaison Officer. [FR Doc. 98-10359 Filed 4-17-98; 8:45 am] BILLING CODE 3710-55-M --- Source: Frix Law Library, https://www.frixlaw.com/law-library/documents/fr%3A98-10359. Public record. Not legal advice.