The Environmental Protection Agency (EPA) and DOE sign a Federal Facilities Agreement, which establishes an environmental review process and establishes a schedule for the remediation of SLAPS, SLDS and HISS. The process requires DOE to evaluate alternatives for waste management, one of which is storage at SLAPS.
The City of St. Louis offers to transfer the SLAPS property back to DOE under the condition that a permanent disposal cell for radioactive wastes won't be constructed on the site. DOE declines acceptance of the SLAPS property from the city until the environmental review process is conducted.
Radiological characterization activities are conducted on the six properties adjacent to Mallinckrodt to determine whether contamination extends beyond the Mallinckrodt property boundaries.
An Engineering Evaluation/Cost Analysis (EE/CA), which outlines the scope of interim removal actions at SLDS, is prepared and released for review and comment to the public. Once DOE prepares a Responsiveness Summary to address the comments received on the SLDS EE/CA, limited removal action activities are undertaken at SLDS.
The Madison Site is added to the FUSRAP list of sites slated for cleanup. The FUSRAP site is located within a limited area of an active facility.
The St. Louis Site Remediation Task Force is established. Two citizens committees are established for the purpose of working closely with FUSRAP representatives and serving as a "voice of the people." These organizations are the St. Louis Radioactive and Hazardous Waste Oversight Committee and the City of St. Louis Mayor's Advisory Task Force on Radioactive Waste. Later the same year, the members of these two groups join together with other community stakeholders to form the St. Louis Sites Remediation Task Force.
Contaminated soils are removed from seven residential vicinity properties, beginning the North County sites cleanup.
A total of 15,043 cubic yards of contaminated soil is excavated from the Mallinckrodt Plant 10 area (SLDS) and shipped to a licensed, out-of-state disposal facility.
The owner of 9150 Latty Ave., located to the east of HISS, expands the facility and stockpiles about 8,000 cubic yards of contaminated soil on the southwestern corner of the property. This stockpile becomes known as the Eastern Pile.
At SLDS, 750 cubic yards of contaminated soil is excavated from the City Property, Riverfront Trail area, and shipped to a licensed, out-of-state disposal facility.
The 50-series buildings on the Mallinckrodt property are decontaminated and demolished. Contaminated materials are transported by covered gondola cars for disposal in a licensed, out-of-state facility. Brick and cinder blocks are crushed and piled on site to await disposition.
The St. Louis Site Remediation Task Force releases its report containing local stakeholders' conclusions and recommendations for remediating the St. Louis FUSRAP sites.
The St. Louis Oversight Committee is formed from a subset of the St. Louis Remediation Task Force to act as a citizens advisory group in the decision-making process for the St. Louis FUSRAP Sites.
Plant 6 and 7 Buildings are decontaminated and demolished. Contaminated materials are transported by covered gondola cars for disposal in a licensed out-of-state disposal facility. Brick and cinder blocks are crushed and piled onsite to await disposition.
On Oct. 13, the Fiscal Year 1998 Energy and Water Appropriations Act transfers the FUSRAP project to the U.S. Army Corps of Engineers. The St. Louis District of the Corps of Engineers is chosen to carry out remediation on the St. Louis sites. Cleanup activities continue to follow CERCLA guidelines and incorporate National Contingency Plan, or NCP, values.
After public review and comment on an EE/CA released earlier in the year under DOE, the U.S. Army Corps of Engineers completes the removal of approximately 5,100 cubic yards of contaminated material from the west end of SLAPS adjacent to the gabion wall. The area is backfilled with clean soils in December 1997.
Radiological surveys in the vicinity of two bridges over Coldwater Creek in Florissant are performed to support upcoming bridge replacements.
In March, the U.S. Army Corps of Engineers issues two Engineering Evaluation/Cost Analysis (EE/CA) documents (one for SLAPS and one for HISS), which identify potential cleanup measures to be used until a comprehensive cleanup can be achieved. The SLAPS EE/CA includes the Ballfields property as part of the SLAPS/SLAPS VP cleanup and evaluates several possible interim cleanup measures. The HISS EE/CA includes VP No. 2 and soils on three Latty Avenue properties as part of the HISS cleanup and evaluates several possible interim cleanup measures. Both of these documents are presented for public comment and regulatory review at a public meeting in March.
In April, the U.S. Army Corps of Engineers issues a Proposed Plan to the public for review and comment detailing the preferred alternative for final cleanup of SLDS. In August, the EPA approves the final cleanup remedy outlined in the SLDS Record of Decision (ROD).
Building K is decontaminated by the government and demolished by Mallinckrodt. Contaminated materials are transported by covered gondola cars for disposal in a licensed, out-of-state disposal facility.
A detailed characterization, including sampling and analysis, is performed at the Madison Site. The survey includes scanning for gamma radiation on accessible floor and wall surfaces throughout the building and on overhead beams, collection and analysis of indoor dust and debris, and determination of radioactivity levels on overhead beam surfaces.