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Click HERE for the latest updates on cleanup efforts.

The documents listed below are included in DHEC's Administrative Record for the assessment and cleanup alternatives evaluated for the Congaree River sediments. These documents include investigation activities, sampling results, work plans, and cost analyses.

Interested persons are encouraged to review these documents to learn more about this site.

DateTitleDescription
October 5, 2023Certification of Completion - Area 2 Cofferdam 
October 4, 2023Letter to DHEC Requesting Certification of Completion - Area 2 Cofferdam 
August 8, 2023Certification of Completion - Area 1 Cofferdam 
August 4, 2023Letter to DHEC Requesting Certification of Completion - Area 1 Cofferdam 
May 26, 2022DHEC Approval of Modified Removal Action Work Plan 
May 20, 2022DHEC Approval of Entact's Alternate Approach to Cofferdam Liner Material & Reinforcement 
May 18, 2022Entact's Alternate Approach to Cofferdam Liner Material & Reinforcement 
May 12, 2022

Modified Removal Action Work Plan 

 
May 9, 2022DHEC's Approval of the April 2022 Monthly Project Update 
May 8, 2022Dominion Energy's April 2022 Monthly Project Update 
May 4, 2022Approval of 1st Quarter 2022 Quarterly ReportDHEC Approval of Dominion Energy's 1st Quarter 2022 Report
May 2, 2022Approval of the March 2022 Mussel Relocation Initial Reconnaissance Survey 
May 1, 2022Quarterly Report 1st Quarter 2022Dominion Energy's 1st Quarter 2022 Report - Significant Activities & Milestones
April 11, 2022Dominion Energy's March 2022 Mussel Relocation Initial Reconnaissance Survey 
March 31, 2022DHEC's Approval of Diving Safe Practices Manual 
March 31, 2022DHEC's Approval of Dominion Energy's Final Work Plan for Munitions Response 
March 31, 2022DHEC's Approval of Dominion Energy's Final Diving Operations Plan 
March 31, 2022DHEC's Approval of Dominion Energy's Final Explosives Safety Plan Munitions 
 Diving Safe Practices Manual 
 Dominion Energy's Final Diving Operations Plan 
 Dominion Energy's Final Explosives Safety Plan 
 Dominion Energy's Final Work Plan for Munitions Response 
 Army Corps and Dominion Energy Memorandum of Agreement 
March 16, 2022Army Corps Recertification of the Nationwide Permit 
March 10, 2022Dominion Energy's Senate Street Pavement Investigation Report  
March 3, 2022Approval of 4th Quarter 2021 Quarterly ReportDHEC Approval of Dominion Energy's 4th Quarter 2021 Report
March 2, 2022Quarterly Report 4th Quarter 2021Dominion Energy's 4th Quarter 2021 Report - Significant Activities & Milestones
February 25, 2022Dominion Energy's Recertification Joint Federal and State ApplicationDominion Energy's recertification of Joint Federal and State Application
February 25, 2022Dominion Energy Letter Requesting Recertification of Joint Federal & State Application Dominion Energy Letter requesting recertification of the Joint Federal and State Application for the Stakeholder-Developed Modified Removal Action
February 15, 2022DHEC's Action Memorandum on the Modified Removal Action 
December 23, 2021DHEC's Authorization to Construct Under the General Permit 
December 10, 2021Department of the Army Nationwide Permit Verification 
October 25, 2021Approval of 3rd Quarter 2021 Quarterly ReportDHEC Approval of Dominion Energy's 3rd Quarter 2021 Report
October 22, 2021DE's Confirmation to USACE Removal ActionDominion Energy's Confirmation to the US Army Corp of the Removal Action as the Path Forward.
October 22, 2021Quarterly Report 3rd Quarter 2021Dominion Energy's 3rd Quarter 2021 Report - Significant Activities & Milestones
October 20, 2021DHEC's Concurrence Letter - USACE's MOA for SMRA.DHEC's Concurrence Letter with finalizing the US Army Corps of Engineers' historic properties MOA for the Stakeholder Modified Removal Action.
September 23, 2021DHEC's approval of Dominion Energy's Response to Comments on the UXO Plans 
August 25, 2021Dominion Energy's Response to Comments on the UXO Plans 
August 9, 2021Approval of Quarterly Report for 1st & 2nd Quarter of 2021DHEC Approval of Dominion Energy's 1st & 2nd Quarter 2021 Report
August 5, 2021Quarterly Report for 1st & 2nd Quarter of 2021Dominion Energy's 1st & 2nd Quarter 2021 Report - Significant Activities/Milestones/Schedule
April 27, 2021DHEC Comments on UXO Plans 
February 26, 2021Updated Unexploded Ordnance (UXO) Plans
January 28, 2021Quarterly Report for 4th Quarter 2020Dominion Energy's 4th Quarter 2020 Report - Significant Activities/Milestones/Schedule
December 15, 2020Dominion Energy's Response to USACE Additional Information Request Cover LetterDominion Energy's Response to USACE Additional Information Request Cover Letter
 Dominion Energy's Response to USACE Additional Information Request - Enclosure #2Dominion Energy South Carolina, Inc. Congaree River Easement 
Georgia Aster and Smooth Coneflower Survey Columbia, South Carolina 
 Dominion Energy's Response to USACE Additional Information Request - Enclosure #1Memorandum of Agreement
October 27, 2020USACE Additional Information Request USACE Request for Additional Information on the Permit Application
October 21, 2020DNR Comments on Permit Application 
October 6, 2020Weekly Status Report Week Ending 9/30/2020Congaree River Project Weekly Status Report for Week Ending September 30, 2020
September 30, 2020Weekly Status Report Week Ending 9/25/2020Congaree River Project Weekly Status Report for Week Ending September 25, 2020
September 28, 2020Joint Application Attachment C ApprovalDHEC's written approval of Dominion Energy's USACE Permit Submittal Attachment C.
September 28, 2020Attachment CAttachment C - Part 1
Attachment C - Part 2
Attachment C - Part 3
Attachment C - Part 4
Attachment C - Part 5
September 28, 2020Attachment C - Project DescriptionDominion Energy's USACE Permit Submittal Attachment C - Project Description
September 23, 2020Weekly Status Report Week Ending 9/18/2020Congaree River Project Weekly Status Report for Week Ending September 18, 2020
September 21, 2020Joint Application Attachment P ApprovalDHEC's written approval of Dominion Energy's USACE Permit Submittal Attachment P. 
September 21, 2020Joint Application Attachment K ApprovalDHEC's written approval of Dominion Energy's USACE Permit Submittal Attachment K. 
September 21, 2020Joint Application Attachment L ApprovalDHEC's written approval of Dominion Energy's USACE Permit Submittal Attachment L. 
September 21, 2020Joint Application Attachment M ApprovalDHEC's written approval of Dominion Energy's USACE Permit Submittal Attachment M. 
September 18, 2020Attachment L - Historic and Archaeological Properties IdentificationDominion Energy's USACE Permit Submittal Attachment L - Historic and Archaeological Properties Identification
September 18, 2020Attachment M - Cultural Resource Identification Survey, Archaeological Data Recovery Plan, Updated Date Recovery License, and a draft Memorandum of AgreementDominion Energy's USACE Permit Submittal Attachment M - Cultural Resource Identification Survey, Archaeological Data Recovery Plan, Updated Date Recovery License, and a draft Memorandum of Agreement.
September 18, 2020Attachment P - Restoration - Operation, Maintenance and Monitoring PlanDominion Energy's USACE Permit Submittal Attachment P - Restoration - Operation, Maintenance and Monitoring Plan
September 16, 2020Weekly Status Report Week Ending 9/11/2020Congaree River Project Weekly Status Report for Week Ending September 11, 2020
September 10, 2020Attachment K -  Stormwater Management & Sediment Control Plan for Modified Removal ActionDominion Energy's USACE Permit Submittal Attachment K - Stormwater Management & Sediment Control Plan for Modified Removal Action
September 9, 2020Weekly Status Report Week Ending 9/04/2020Congaree River Project Weekly Status Report for Week Ending September 4, 2020
September 2, 2020Dominion Energy's Response to USACE Additional Information Request - Enclosure #5DHEC Approval Letter for the FDP Work Plan
September 1, 2020Joint Application Attachment H ApprovalDHEC's written approval of Dominion Energy's USACE Permit Submittal Attachment H. 
September 1, 2020Attachment H - Mussel Relocation PlanDominion Energy's USACE Permit Submittal Attachment H - Mussel Relocation Plan. 
August 31, 2020Joint Application Attachment G ApprovalDHEC's written approval of the Joint Application Attachment G (Draft Navigation Plan and United States Coast Guard (USCG) Application).
August 31, 2020Joint Application Attachments D, E, & F ApprovalDHEC's written approval of the Joint Application Attachments D (Wetland and Stream Delineation Report), E (Name and Addresses of Adjacent Property Owners), and F (Other Permits and Approvals or Denials)
August 26, 2020Weekly Status Report Week Ending 8/21/2020Congaree River Project Weekly Status Report for Week Ending August 21, 2020
August 20, 2020Attachment G - Draft Navigation Plan w/USCG ApplicationDraft Navigation Plan and United States Coast Guard (USCG) Application that will be included as Attachment G in the United States Army Corps of Engineers (USACE) permit application that will be submitted by September 30, 2020.
August 19, 2020Weekly Status Report Week Ending 8/14/2020Congaree River Project Weekly Status Report for Week Ending August 14, 2020
August 29, 2020Joint Application Attachments D, E, & FAttachments D (Wetland and Stream Delineation Report), E (Name and Addresses of Adjacent Property Owners), and F (Other Permits and Approvals or Denials) that will be included in the United States Army Corps of Engineers (USACE) permit application that will be submitted by September 30, 2020.
August 14, 2020Joint Application Attachments A & B ApprovalDHEC's written approval of the Joint Application Attachment A (NWP 38 Checklist) and Attachment B (Cofferdam Design Drawings).
August 12, 2020Weekly Status Report Week Ending 8/07/2020Congaree River Project Weekly Status Report for Week Ending August 7, 2020
August 7, 2020Weekly Status Report Week Ending 7/31/2020Congaree River Project Weekly Status Report for Week Ending July 31, 2020
August 5, 2020Approval of List of AttachmentsDHEC's written approval of Dominion Energy's USACE Permit Application List of Attachments.
August 5, 2020USACE Permit Application - List of AttachmentsList of attachments from Dominion Energy that will accompany the actual 3-page permit application that will be submitted to the United States Army Corps of Engineers (USACE) by September 30, 2020.
August 3, 2020Joint Application Attachment A & Attachment B Attachments A (Draft Nationwide Permit 38 Checklist)  and B (Cofferdam Design Drawings).
July 31, 2020Weekly Status Report Week Ending 7/24/2020Congaree River Project Weekly Status Report for Week Ending July 24, 2020
July 31, 2020Approval of Surface Water AssessmentDHEC's written approval of Dominion Energy's Surface Water Assessment
July 31, 2020Surface Water AssessmentDominion Energy's Surface Water Assessment Report – June 2020 Sampling Event
July 23, 2020Weekly Status Report Week Ending 7/17/2020`Congaree River Project Weekly Status Report for Week Ending July 17, 2020
July 17, 2020Weekly Status Report Week Ending 7/10/2020Congaree River Project Weekly Status Report for Week Ending July 10, 2020
July 9, 2020Rockfill Cofferdam Slope Stability Analysis ApprovalDHEC's Written Approval of the Rockfill Cofferdam Slope Stability Analysis 
July 9, 2020Reinforced Rockfill Cofferdam Conceptual Design ApprovalDHEC's Written Approval of the Reinforced Rockfill Cofferdam Conceptual Design
July 8, 2020Weekly Status Report Week Ending 7/3/2020Congaree River Project Weekly Status Report for Week Ending July 3, 2020
July 1, 2020Weekly Status Report Week Ending 6/26/2020Congaree River Project Weekly Status Report for Week Ending June 26, 2020
June 24, 2020Weekly Status Report Week Ending 6/19/2020Congaree River Project Weekly Status Report for Week Ending June 19, 2020
June 19, 2020Weekly Status Report Week Ending 6/12/2020Congaree River Project Weekly Status Report for Week Ending June 12, 2020
June 17, 2020Low Flow Sensitivity Analysis Approval DHEC's Written Approval of the Low Flow Sensitivity Analysis
June 10, 2020Congaree River Low Flow Sensitivity AnalysisWSP USA's Low Flow Sensitivity Analysis of the Congaree River
June 10, 2020Weekly Status Report Week Ending 6/5/2020Congaree River Project Weekly Status Report for Week Ending June 5, 2020
June 8, 2020River Bottom Erosion Potential Evaluation ApprovalDHEC's Written Approval of the River Bottom Erosion Potential Evaluation 
June 8, 2020West Bank Erosion Potential Evaluation ApprovalDHEC's Written Approval of the West Bank Erosion Potential Evaluation
June 3, 2020Weekly Status Report Week Ending 5/29/20Congaree River Project Weekly Status Report for Week Ending May 29, 2020
May 21, 2020Comments on Revised Permit Application StrategyDHEC Comments on Revised Permit Application Strategy
April 27, 2020Review of 1st Quarter 2020 ReportDHEC Review of Dominion Energy's 1st Quarter 2020 Report 
April 27, 2020Quarterly Report for 1st Quarter 2020Dominion Energy's 1st Quarter 2020 Report - Significant Activities/Milestones/Schedule
April 21, 2020Revised Permit Application StrategyRevised Permit Application Strategy from Dominion Energy
April 10, 2020Approval of Reinforced Rockfill Berm ApproachDHEC Letter of Approval  to Dominion Energy of Reinforced Rockfill Berm Approach
April 7, 2020Letter Requesting Revised Permit Application StrategyDHEC Letter to Dominion Energy requesting Revised Permit Application Strategy
April 7, 2020Lexington County Concurrence LetterLexington County Concurrence Letter on No Rise No Impact Certification
March 31, 2020Richland County Concurrence LetterRichland County Concurrence Letter on No Rise No Impact Certification
March 10, 2020River Bottom Erosion Potential EvaluationWSP USA's River Bottom Erosion Potential Evaluation of the Congaree River
February 24, 2020Quarterly Report for 4th Quarter 2019Dominion Energy's 4th Quarter 2019 Report  - Significant Activities/Milestones/Schedule
November 26, 2019West Bank Erosion Potential EvaluationWSP USA's West Bank Erosion Potential Evaluation of the Congaree River
October 15, 2019Quarterly Report for 3rd Quarter 2019Dominion Energy's 3rd Quarter 2019 Report  - Significant Activities/Milestones/Schedule
October 9, 2019No Rise Certification sent to Local Floodplain ManagersNo Rise Certification sent to Local Floodplain Managers
October 4, 2019USACE Concurrence with MRA Conceptual Plan U.S. Army Corps of Engineers Concurrence with Modified Removal Action Conceptual Plan
August 28, 2019Dominion Energy's Response to USACE email Dominion Energy's Response to U.S. Army Corps of Engineers email from 08-08-19
July 24, 2019Permit Application Strategy
 		Dominion Energy's Permit Application Strategy
 
July 19, 2019Review of Semiannual Surface Water Assessment Report
 		DHEC's Review of the Semi-Annual Surface Water Assessment Report
 
July 1, 2019Quarterly Report for 2nd Quarter 2019
 		Dominion Energy's 2nd Quarter 2019 Report
 
June 26, 20194th Semiannual Surface Water Assessment Report
 		Dominion Energy's 4th Semi-Annual Surface Water Assessment Report
April 12, 2019No Rise Certification
 		Dominion Energy's No Rise Certification for the Modified Removal Action Cofferdam Footprint
April 12, 2019Hydraulic Analysis ReportDominion Energy's Hydraulic Backwater Analysis for the Modified Removal Action Cofferdam Footprint
April 2, 2019Quarterly Report 1st Quarter 2019: Significant MilestonesSCE&G's Quarterly Report on progress made and significant milestones reached during 1st Quarter 2019
February 8, 2019Review: Conceptual Plan for a Modified Removal ActionDHEC's Approval of Modified Removal Action as preferred path forward along with stakeholder support statements
December 18, 2018Conceptual Plan for a Modified Removal ActionSCANA's Summary of the Modified Removal Action that Stakeholders agreed to on November 15, 2018
October 23, 2018Review: Preliminary Removal Action Work PlanDHEC's Response to Preliminary Removal Action Work Plan
September 18, 2018Preliminary Removal Action Work PlanSCANA's Updated Removal Action Work Plan
July 31, 2018Removal Action AlternativeDHEC’s request for SCANA to submit an updated work plan for the removal of tar-like material.
June 22, 2018Removal Action AlternativeLetter from DHEC to SCANA requesting them to evaluate the potential for a modified removal action
May 23, 2018Corps Response to SCE&G dated May 19, 2018 with EnclosuresUSACOE response to SCANA’s Letter.
May 23, 2018Review: Second Semi-Annual Surface Water Assessment ReportDHEC’s review of the Surface Water Monitoring Report
May 8, 2018Second Semi-Annual Surface Water Assessment ReportSurface Water Monitoring Report
April 13, 2018US EPA Letter to Mayor Benjamin Concerning Site CleanupLetter from US EPA to Mayor Benjamin
March 27, 2018Letter from Mayor Benjamin to  US EPA AdministratorLetter from Mayor Benjamin to US EPA Administrator Scott Pruitt
March 26, 2018Guignard’s Request to Participate in Remedial Measures DiscussionLetter from Guignard Associates, LLC, property owner on eastern bank, requesting to be included in site remedial discussions.
March 22, 2018Response Regarding Letter of 3/19/2018Southern Environmental Law Center’s response to SCANA’s letter to USACOE.
March 19, 2018Cofferdam Approach for a Remedial ActionLetter from SCANA to USACOE requesting additional information on a modified removal action alternative
December 7, 2017Under Review: Draft Sediment Capping Work PlanLetter from DHEC to Congaree River Keeper outlining that the capping plan has been received and is currently under review.
November 30, 2017Draft Sediment Capping Work Plan with AppendicesSCANA’s work plan for capping the coal tar in the river
November 27, 2017Review: First Semi-Annual Surface Water Assessment ReportDHEC’s Review of the Surface Water Assessment Report
November 7, 2017First Semi-Annual Surface Water Assessment ReportSurface Water Assessment Report
October 18, 2017USACOE Nationwide Permit (NWP 38)USACOE approval of the Nationwide Permit for Capping the river
October 5, 2017Review: GW Monitoring Report, June 2017Letter from Cassidy to SCANA
September 20, 2017GW Monitoring Report, June 2017Groundwater Monitoring Report
August 9, 2017Letter from DHEC to Riverkeeper with Aquatic Macroinvertebrate Study AttachmentLetter from DHEC to Riverkeeper with July 7, 2017 Aquatic Macroinvertebrate Bioassessment Study attached
August 9, 2017Letter from DHEC to SCANA with Aquatic Macroinvertebrate Bioassessment  AttachmentLetter from DHEC to SCANA with July 7, 2017 Aquatic Macroinvertebrate Bioassessment attached
July 7, 2017An Investigation into the Potential Impacts of Coal Tar Contamination on the Invertebrate Community- DHEC Technical ReportDHEC’s study of the invertebrate community and evaluation of environmental impacts on the invertebrate populations in the River.
April 28, 2017Evaluation of Proposed Congaree Capping Alternative for Control of Coal Tar SedimentsSouthern Environmental Law Center’s Letter and Report evaluating the Capping Alternative for control of Coal Tar Sediments
April 25, 2017Submittal from SCANA to DHECResponse to DHEC request for additional information regarding cofferdam options.  Includes SCANA's original evaluation from Paul C. Rizzo Associates, Inc. of coffer dam options for the Congaree River.
April 7, 2017Letter from DHEC to SCE&GRe:  Surface Water Monitoring Results
DHEC's request for SCE&G to submit a work plan proposing a schedule and locations for regular surface water sampling in the Congaree River.
April 4, 2017Congaree River Surface Water Sampling ReportAnalytical results from the DHEC March 2017 surface water sampling.
April 4, 2017Congaree River Surface Water Sampling Location MapMap illustrating the surface water sampling locations for the DHEC March 2017 sampling event.
March 7, 2017Congaree River Surface Water Sampling PlanDHEC's work plan for surface water sampling to be conducted in the Congaree River in response to concerns raised at the February 13, 2017 Community Meeting.
January 17, 2017Letter from SCANA to DHECRe:  Viability of Large Sandbags
Summarizes the results of the large one-ton sandbag testing activities completed during the Field Demonstration Project (FDP) conducted by SCE&G.  Includes reasons that the large sandbags were determined to not be a viable option for isolating and dewatering areas for subsequent sediment excavation.
October 31, 2016Letter from US Army Corps of Engineers (USACOE) to South Carolina Department of Natural Resources Engineers LetterCorrespondence regarding SCE&G's application for an USACOE permit.  Specifically, the Corps plans to authorize the project under Nationwide Permit 38, Cleanup of Hazardous and Toxic Waste.
September 29, 2016Letter from SCANA to US Army Corps of Engineers (USACOE)Re:  Joint Application and Pre-Construction Notification (JA-PCN)
Responses to the initial comments provided by the USACOE regarding the September 22, 2016 submittal of the JA-PCN.
September 22, 2016Submittal from SCANA to US Army Corps of Engineers (USACOE)Re:  Joint Application and Pre-Construction Notification - Individual Permit Phase 2 - Modified Removal Action - Sediment Capping Project
SCE&G's Joint Federal and State Application for Activities Affecting Waters of the United States or Critical Areas of the State of South Carolina.  Includes documents in support of an Individual Permit Application.
August 16. 2016Letter from DHEC to SCANARe:  SCE&G Congaree River Sediments, Columbia SC
Correspondence requesting that SCE&G pursue Engineering Evaluation/Cost Analysis Alternative 3 - Sediment Capping and Institutional Controls instead of the removal alternative previously envisioned.
July 12, 2016Submittal from SCANA to DHECRe:  Field Demonstration Project (FDP) - Documentation Report
SCANA's Documentation Report on the FDP submitted to DHEC for review and approval.  Includes a detailed description of site preparation activities, permits and approvals, regulatory interactions, subcontractors and the findings of the completed field work in support of the FDP.
September 2, 2015Submittal from SCANA to DHECRe:  Field Demonstration Project Work Plan
DHEC's approval of the Field Demonstration Project Work Plan.
July 17, 2015Submittal from SCANA to DHECRe:  Field Demonstration Project (FDP) - Work Plan
SCANA's FDP Work Plan submitted to DHEC for review and approval of a pilot test to try an alternate removal approach by building a temporary dam using sandbags to allow for excavation in the river.
April 30, 2015Letter from APEX Companies, LLC (SCANA Contractor) to US Army Corps of Engineers (USACOE)Re:  USACE Permit - P/N 2011-01356-6NO
Update on the evaluation of cofferdam approaches for the Modified Removal Action.
March 2, 2015Letter from DHEC to SCE&GRe:  Response to SCANA's February 18, 2015 Status Update - Removal Action Decision
DHEC approval of SCANA's request to move forward with design and permitting of the Modified Removal Action approach as described/proposed in SCANA's February 18, 2015 letter.
February 18, 2015Letter from SCANA to DHECRe:  Status Update - Removal Action Decision
Update regarding the Congaree River Sediment Removal project.  Specifically, the problems and concerns identified during review of the current design via the permitting process with regulatory agencies and how the selected removal action alternative would be implemented.  Includes request that DHEC consider a modified approach for completing the removal action.
May 8, 2013Letter from DHEC to SCE&GRe:  SCE&G Huger Street Former MGP, Columbia SC
Correspondence that DHEC is drafting an Action Memorandum to select Alternative 4 as the official remedy selection for the site.  Request for SCE&G to begin the design and permit process.
January 2013Final Engineering Evaluation/
Cost Analysis (EE/CA)		Summary of cleanup options evaluated by DHEC.
March 2012Project Delineation ReportSummary of all 5 phases of assessment and discussion of results.
September 2011Phase IV Delineation Preliminary FindingsAssessment Report for Phase 5 Proposed Activities.
August 2011Phase III Delineation Preliminary FindingsAssessment Report for Phase 4 Proposed Activities.
June 2011Phase II Delineation SummaryAssessment Report for Phase 3 Proposed Activities.
December 2010Phase I Delineation SummaryAssessment Report for Phase 2 Proposed Activities.
September 2010Delineation Work PlanInitial Assessment Work Plan to collect sediment samples in the Congaree River.
August 2002Voluntary Cleanup ContractAgreement between DHEC and South Carolina Electric & Gas for additional assessment and/or remediation at the site of the former Huger Street Manufactured Gas Plant (MGP)

 

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Preferred Cleanup Alternative - Congaree River

Former Hoechst Celanese Site - Reports & Maps

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