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Five Year Review in Order to Document the Continued Protectiveness of the Sediment Overburden in the Ponds

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Five Year Review in Order to Document the Continued Protectiveness of the Sediment Overburden in the Ponds FIRST FIVE·YEAR REVIEW REPORT Imperial Refining Compao)' Superfund Site EPA ID No. OKOOO2024099 Ardmore, Carter County, Oklahoma This memorandum documents the United States Environmental Protection Agency's (EPA) performance, detenninations, and approval ofthe Imperial Refining Company Superfund Site (Site) first five-year review under Section 121 (e) of the Comprehensive Environmental Response, Compensation, and Liability Act, 42 United States Code Section 962 1(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 review for the Site was performed through a review ofsite documents and site-specific requirements; a site inspection performed on June 5, 2012; 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 elimination of soil direct conlact 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 review, 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 of Institutional Controls - Institutional controls should 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 rainfall events greater than a 2-year storm event. Maintenance to prevent erosion where waste remains in-place may include grading, seeding, or importing of backfill. Determinations The selected remedy for the Site currently protects human health and the environment because the remedy is perfonning as intended and institutional controls are in place restricting land and groundwater use. The remedy will remain protective of human health and the environment in the long-tcnn provided O&M activities, continue, and the institutional controls remain in place. -, Carl Edlund U.S. EPA Region 6 / Date Director, Superfund Division 2 CONCURRENCES: FIRST FIVE-YEAR REVIEW REPORT IMPERIAL REFll'lNG COMPANY SUPERFUND SITE EPA ID No. OK0002024099 ,-<-"'L!..C,---"-l'-'<"!7f--'<",- ,Date: 1 / J'4!r3 Brian W. Ytueller. U.. EPA Remedial Project Manager -::-cC?,---,Cif:c:-f-t-+L7..L7t£::.=t=-:07-._<-__'Dale !E-S ! I ~ Cathy Gilmore. U.S. EPA Superfund LAfNM/OK Section Chief 6~2~4~~;~~;;~¥-Date:~ 3 Charles Faultry, U.S. EPA Associate Director, Superfund Re edial Branch t;:::k~~r¢~~~__Date: f)~/t 1 Mark A. Peyck .5. EPA Chief, Superfund Branch, Office of Regional Counsel C q ~ Date 2-1-2010 l'fung-Ehnillg. U.S. EPA_~ Atto } o~ee of Regional Counsel Date:;'j~ Pam hill ips, U.S. EPA Deputy Director. Superfund ivision 3 FIVE-YEAR REVIEW REPORT FOR IMPERIAL REFINING COMPANY SUPERFUND SITE CARTER COUNTY, OKLAHOMA Prepared by Aroo Samwel Oklahoma Department of Environmental Quality Oklahoma City, Oklahoma JANUARY 2013 TABLE OF CONTENTS List of Acronyms 4 Executive Summary 5 Five-Year Review Summary Form 7 1.0 lntroduction 9 2.0 Site Chronology 10 3.0 Backgronnd 12 3.1 Physical Characteristics 12 3.2 Land and Resource Use 13 3.3 History of Contamination 13 3.4 Initial Response 14 3.5 Basis for Taking Action 14 4.0 Remedial Actions 17 4.1 Remedy Selection 18 4.2 Remedy Implementation 18 4.3 System Operations/Operation and Maintenance (O&M) 2\ 5.0 Five-Year Review Process 22 5.1 Administrative Components 22 5.2 Community Notification and Involvement 23 5.3 Document Review 23 5.4 Data Review 23 5.5 Site Inspection 24 5.6 Site Interviews 25 6.0 Tecbnical Assessment 26 6. t Question A: Is the remedy functioning as intended by the decision documents? , " ,.. ,.26 6.2 Question B: Are the exposure asswnptions, toxicity data, cleanup levels, and remedial action objectives (RAOs) used at the time of the remedy selection still valid?, 27 6.3 Question C: Has any other information come to light that could call into question the protectiveness of the remedy? 28 6.4 Technical Assessment Summary 28 2 7.0 Institutional Control 28 7.1 Types oflnstitutional Controls in Place at the Site 29 7.2 Effect of Future Land Use Plans on Institutional Controls 29 7.3 Plans for Changes to the Site Contamination 5tatus 29 8.0 Issues 29 9.0 Recommendations and Follow-up Actions 29 10.0 Protectiveness Statement 30 11.0 Next Review 30 Tables Table I - Chronology of Site Events Table 2 - Current Hwnan Health Benchmarks Table 3 - Current Ecological Benchmarks Table 4 - Feasibility Study Alternatives Summary Table 5 - Annual O&M Cost Estimate Table 6 - Pond Sampling Results Table 7 - Recommendations and Follow-Up Actions Attacbments I. Site Location Map 2. Site Map 3. Public otice 4. Documents Reviewed 5. Pond Sample Locations 6. Site Inspection Checklist 7. Interview Records 8. Photos Documenting Site Conditions 9. Deed Notices 3 LIST OF ACRONYMS ARARs Applicable and Relevant and Appropriate RequiremenlS CERCLA Comprehensive Environmental Response, Compensation, and Liability Act of 1980 also known as Superfund: Amended in 1986 by the Superfund Amendments and Reauthorization Act (SARA). DEQ Oklahoma Department of Environmental Quality EPA United States Environmental Protection Agency FT Feet FS Feasibility Study His Hazard Indices IC lnstiturional Control MGIKG Milligram /Kilogram NCP National Oil and Hazardous Substances Contingency Plan NPL National Priorities List: A list ofsites identified for remediation under CERCLA. ODOT Oklahoma Department ofTransportation O&M Operation and Maintenance PAHs Polynuclear Aromatic Hydrocarbons PCB Polychlorinated Biphenyl RA Remedial Action RAOs Remedial Action Objectives RD Remedial Design RI Remedial Investigation RlIFS RemediallnvestigationfFeasibility Study ROD Record of Decision: Documents selection ofcost-effective Superfund financed remedy. SARA Superfund Amendments am Reauthorization Act of 1986. (See CERCLA.) TCLP Toxicity Characteristic Leaching Procedure UST Underground Storage Tank 4 EXECUTIVE SI:MMARV The Oklahoma Depanment of Environmental Quality (D£Q). the lead agency, and U.S. Environmental Protection Agency Region 6 (EPA), the support agency, conducted the first Five- Vear Review in accordance with Section 121(c) of the Comprehensive Environmental Response, Compensation and Liability Act (CERCLA), 42 United Stales Code (USC) §9621(c). of the remedial action implemented at the Imperial Refining Company Superfund Site (Site) in Carter County, Oklahoma. The purpose of this Five-Year Review is to determine whether the selected remedy for the Site is currently protective of human health and the environment. This is the firsl Five-Year Review for the Site. The triggering action for the Five-Year Review is the Remedial Action (RA) construction stan date on February 13.2008. The scheduled date for the Second Five-Year Review is February 2018; however, the final commitment date is five years from the signature date of this Five-Year Review Report. This Five-Year Review was conducted from May 2012 through December 2012, and its methods, findings. conclusions, and recommendations are documented in this report. The Site was placed on the National Priorities List on May II, 2000. Based upon the concentrations and risk of arsenic and benzo(a)pyrene, the Site was determined to pose a principal threat because of the potential for direct contact through ingestion, dennal contact, inhalation and/or food-chain uptake with the contaminated surface soil, pond and creek sediment, and waste material. The original remedy in the Record of Decision (ROD) called for excavation and offsite disposal of all wastes found onsite. The EPA issued a ROD Amendmenl in February 2009 that stated in areas where excavation was impractical and potentially dangerous; the remedy amendment was to excavate and remove waste materials to the extent practicable and place a clay barrier over the non-hazardous wastes thaI remain in-place. The Remedial Action Objectives have been achieved. The assessment orthis Five-Year Review found that all threats at the Site have been addressed, and the selected remedy is expected 10 remain protective of human health and the environment. There are no issues that currently prevent the remedy from being protective of human health and the environment. Erosion control measures seem to be working, but conditions need 10 be observed at least annually, and after rainfall events greater than a 2·year storm event. ~aintenance to prevent erosion where waste remains in-place may include grading, seeding, or importing of backfill. The
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