Tuesday, August 22, 2017

Supplemental Feasibility Study (SFS)

In early 2010, preparations were underway to perform the remedy when EPA was asked to reconsider its determination. That request was granted, setting in motion additional research and analysis in the form of a supplemental feasibility study. Between January 2010 and December 2011, the PRPs worked in cooperation with EPA and with the input of the Missouri Department of Natural Resources (MDNR) to undertake the Supplemental Feasibility Study (SFS) in order to evaluate the Selected Remedy as compared to two excavation alternatives.

The Supplemental Feasibility Study has been approved by EPA and released for public review.  The SFS is available on the Records page of this website or through EPA’s website at http://www.epa.gov/region07/cleanup/npl_files/ (link opens in a new window).

Following completion of the Supplemental Feasibility Study, the PRPs prepared an Executive Summary in order to provide a more concise summary of the key findings and evaluations of the SFS.  While not part of the SFS, the Executive Summary has been submitted to EPA to be part of the file for the Site and we are making the document available through this website.

Included in the Executive Summary is a table, reproduced below, which summarizes the relative risks, costs and schedules for the three remedial alternatives evaluated in the SFS.

 

Table ES-1 SUMMARY OF POTENTIAL RISKS, IMPLEMENTATION SCHEDULES AND COSTS
WEST LAKE LANDFILL SFS REMEDIAL ALTERNATIVES

  ROD-Selected Remedy
"Complete Rad Removal"
with Off-site Disposal
"Complete Rad Removal"
with On-Site Disposal
Long term residual
cancer risk 1,000
years after cleanup
1.3 x 10-6 (1.3 extra incidences
   in 1,000,000 people)
< 1 x 10-7 (less than 0.1 extra
    incidence in 1,000,000 people)
1.5 x 10-6 (1.5 extra incidences
   in 1,000,000 people)
Short term risks
during cleanup
On-Site Workers
Industrial accidents: 4.7
Cancer risk: 7.2 x 10-5 (0.72
    extra incidences in 10,000
    people)
Worker dose: 50 mrem/yr
On-Site Workers
Industrial accidents: 7.6
Cancer risk: 7.6 x 10-4 (7.6
    extra incidences in 10,000 people)
Worker dose: 260 mrem/yr
On-Site Workers
Industrial accidents: 9.0
Cancer risk: 7.4 x 10-4 (7.4
    extra incidences in 10,000
    people)
Worker dose: 260 mrem/yr
Community
Transportation accidents: 0.61
Cancer risk: 3.3 x 10-6 (0.33
   extra incidences in 100,000 people)
Carbon dioxide emissions:
   8,350 tons
Community
Transportation accidents: 1.4
Cancer risk: 2.1 x 10-5 (2.1
   extra incidences in 100,000 people)
Carbon dioxide emissions:
   35,400 tons
Community
Transportation accidents: 0.79
Cancer risk: 2.0 x 10-5 (2.0
   extra incidences in 100,000 people)
Carbon dioxide emissions:
   17,900 tons
Schedule to reach
cleanup goals
3 years
 (or 5 years at spend rate of
    $10M per year)
4 years
 (or 29 years at spend rate of
    $10M per year)
6 years
 (or 13 years at spend rate of
    $10M per year)
Costs Capital construction:
   $41,400,000
OM&M per year: $42,000 to
   $414,000
Capital construction:
   $259,000,000 to $415,000,000
OM&M per year: $40,000 to
   $412,000
Capital construction:
   $117,000,000
OM&M per year: $52,000 to
   $604,000

The table above is also available in PDF format as a printable page here: Table ES-1 Standalone Printable (PDF, opens in new window)

The full Executive Summary can be downloaded from the Records page, or directly by clicking here: Executive Summary (PDF, opens in new window)

The full Supplemental Feasibility Study released on December 30, 2011 can be downloaded from the Records page, or directly by clicking here: Supplemental Feasibility Study (PDF, 96MB, opens in new window)

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