Imperial 1st Five Year Review Feb 2013 ocr 1 |
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FffiST FIVE-YEAR REVIEW REPORT
Imperial Refining Company Superfund Site
EPA ID No_ OKOOO2024099
Ardmore, Carter County, Oklahoma
This memorandum documents the United States Environmental Protection Agency's (EPA) performance,
determinations, and approval of the Imperial Refining Company Superfund Site (S ite) first five-year
review under Section 121 (e) ofthe Comprehensive Environmental Response, Compensation, and
Liabi lity Act, 42 United States Code Section 962 I (c), as provided in the attached First Five-Year Review
Report prepared by the Oklahoma Department of Environmental Quality on behalf of EPA.
Summary of Five-Year Review Findings
The first five-year rev iew for the Site was performed through a rev iew of site documents and site-specific
requ irements; a site inspection performed on June 5, 20 12; interviews with personnel from the Oklahoma
Department of Environmental Quality; interviews with stakeholders; and a review of data collected at the
Site during the first five-year review period.
The Site remedy included: off-site disposal of principal threat wastes within the soil; reduction or
e limination of soil direct contact threats; and placement of institutional controls (in the form of
conveyance notices) to inform the public of Site conditions.
The remedial action construction was initiated on February 13, 2008, and completed in February 2012.
Operation and maintenance (O&M) activities will be on-going on an annual basis. The remedy should
remain protective in the long-term.
During the first five-year rev iew, there were no issues identified that prevent the remedy form being
protective of human health and the environment.
Actions Recommended
Recommendations and follow-up actions associated with the Site that were identified during the five-year
review include the following:
• Sediment Sampling of Ponds - Pond sediment sampling is recommended before the next five
year review in order to document the continued protectiveness of the sediment overburden in the
ponds. Erosion control measures seem to be working, but the site should be inspected at least
annually (and after significant rainfall events) to check for erosion on or near the clay barrier
where waste remains in-place.
• Enforcement ofInstitutionai Controls - Institutional controls shou ld remain in place and
continue to be enforced.
• Site Maintenance - Erosion control measures seem to be working, but conditions need to be
observed at least annually. and after rainfa ll events greater than a 2-year storm event.
Maintenance to prevent erosion where waste remains in-place may include grad ing, seeding, or
im porting of backfill.
Object Description
Description
| Title | Imperial 1st Five Year Review Feb 2013 ocr 1 |
| Full text | FffiST FIVE-YEAR REVIEW REPORT Imperial Refining Company Superfund Site EPA ID No_ OKOOO2024099 Ardmore, Carter County, Oklahoma This memorandum documents the United States Environmental Protection Agency's (EPA) performance, determinations, and approval of the Imperial Refining Company Superfund Site (S ite) first five-year review under Section 121 (e) ofthe Comprehensive Environmental Response, Compensation, and Liabi lity Act, 42 United States Code Section 962 I (c), as provided in the attached First Five-Year Review Report prepared by the Oklahoma Department of Environmental Quality on behalf of EPA. Summary of Five-Year Review Findings The first five-year rev iew for the Site was performed through a rev iew of site documents and site-specific requ irements; a site inspection performed on June 5, 20 12; interviews with personnel from the Oklahoma Department of Environmental Quality; interviews with stakeholders; and a review of data collected at the Site during the first five-year review period. The Site remedy included: off-site disposal of principal threat wastes within the soil; reduction or e limination of soil direct contact threats; and placement of institutional controls (in the form of conveyance notices) to inform the public of Site conditions. The remedial action construction was initiated on February 13, 2008, and completed in February 2012. Operation and maintenance (O&M) activities will be on-going on an annual basis. The remedy should remain protective in the long-term. During the first five-year rev iew, there were no issues identified that prevent the remedy form being protective of human health and the environment. Actions Recommended Recommendations and follow-up actions associated with the Site that were identified during the five-year review include the following: • Sediment Sampling of Ponds - Pond sediment sampling is recommended before the next five year review in order to document the continued protectiveness of the sediment overburden in the ponds. Erosion control measures seem to be working, but the site should be inspected at least annually (and after significant rainfall events) to check for erosion on or near the clay barrier where waste remains in-place. • Enforcement ofInstitutionai Controls - Institutional controls shou ld remain in place and continue to be enforced. • Site Maintenance - Erosion control measures seem to be working, but conditions need to be observed at least annually. and after rainfa ll events greater than a 2-year storm event. Maintenance to prevent erosion where waste remains in-place may include grad ing, seeding, or im porting of backfill. |
| Date created | 2013-04-22 |
| Date modified | 2013-04-22 |
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