Administrative Record - Congaree River

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.

Date Title Description
August 7, 2020 Weekly Status Report Week Ending 7/31/2020 Congaree River Project Weekly Status Report for Week Ending July 31, 2020
August 5, 2020 Approval of List of Attachments DHEC's written approval of Dominion Energy's USACE Permit Application List of Attachments.
August 5, 2020 USACE Permit Application - List of Attachments List 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.
July 31, 2020 Weekly Status Report Week Ending 7/24/2020 Congaree River Project Weekly Status Report for Week Ending July 24, 2020
July 31, 2020 Approval of Surface Water Assessment DHEC's written approval of Dominion Energy's Surface Water Assessment
July 31, 2020 Surface Water Assessment Dominion Energy's Surface Water Assessment Report – June 2020 Sampling Event
July 23, 2020 Weekly Status Report Week Ending 7/17/2020` Congaree River Project Weekly Status Report for Week Ending July 17, 2020
July 17, 2020 Weekly Status Report Week Ending 7/10/2020 Congaree River Project Weekly Status Report for Week Ending July 10, 2020
July 9, 2020 Rockfill Cofferdam Slope Stability Analysis Approval DHEC's Written Approval of the Rockfill Cofferdam Slope Stability Analysis 
July 9, 2020 Reinforced Rockfill Cofferdam Conceptual Design Approval DHEC's Written Approval of the Reinforced Rockfill Cofferdam Conceptual Design
July 8, 2020 Weekly Status Report Week Ending 7/3/2020 Congaree River Project Weekly Status Report for Week Ending July 3, 2020
July 1, 2020 Weekly Status Report Week Ending 6/26/2020 Congaree River Project Weekly Status Report for Week Ending June 26, 2020
June 24, 2020 Weekly Status Report Week Ending 6/19/2020 Congaree River Project Weekly Status Report for Week Ending June 19, 2020
June 19, 2020 Weekly Status Report Week Ending 6/12/2020 Congaree River Project Weekly Status Report for Week Ending June 12, 2020
June 17, 2020 Low Flow Sensitivity Analysis Approval  DHEC's Written Approval of the Low Flow Sensitivity Analysis
June 10, 2020 Congaree River Low Flow Sensitivity Analysis WSP USA's Low Flow Sensitivity Analysis of the Congaree River
June 10, 2020 Weekly Status Report Week Ending 6/5/2020 Congaree River Project Weekly Status Report for Week Ending June 5, 2020
June 8, 2020 River Bottom Erosion Potential Evaluation Approval DHEC's Written Approval of the River Bottom Erosion Potential Evaluation 
June 8, 2020 West Bank Erosion Potential Evaluation Approval DHEC's Written Approval of the West Bank Erosion Potential Evaluation
June 3, 2020 Weekly Status Report Week Ending 5/29/20 Congaree River Project Weekly Status Report for Week Ending May 29, 2020
May 21, 2020 Comments on Revised Permit Application Strategy DHEC Comments on Revised Permit Application Strategy
April 27, 2020 Review of 1st Quarter 2020 Report DHEC Review of Dominion Energy's 1st Quarter 2020 Report 
April 27, 2020 Quarterly Report for 1st Quarter 2020 Dominion Energy's 1st Quarter 2020 Report - Significant Activities/Milestones/Schedule
April 21, 2020 Revised Permit Application Strategy Revised Permit Application Strategy from Dominion Energy
April 10, 2020 Approval of Reinforced Rockfill Berm Approach DHEC Letter of Approval  to Dominion Energy of Reinforced Rockfill Berm Approach
April 7, 2020 Letter Requesting Revised Permit Application Strategy DHEC Letter to Dominion Energy requesting Revised Permit Application Strategy
April 7, 2020 Lexington County Concurrence Letter Lexington County Concurrence Letter on No Rise No Impact Certification
March 31, 2020 Richland County Concurrence Letter Richland County Concurrence Letter on No Rise No Impact Certification
March 10, 2020 River Bottom Erosion Potential Evaluation WSP USA's River Bottom Erosion Potential Evaluation of the of the Congaree River
February 24, 2020 Quarterly Report for 4th Quarter 2019 Dominion Energy's 4th Quarter 2019 Report  - Significant Activities/Milestones/Schedule
November 26, 2019 West Bank Erosion Potential Evaluation WSP USA's West Bank Erosion Potential Evaluation of the of the Congaree River
October 15, 2019 Quarterly Report for 3rd Quarter 2019 Dominion Energy's 3rd Quarter 2019 Report  - Significant Activities/Milestones/Schedule
October 9, 2019 No Rise Certification sent to Local Floodplain Managers No Rise Certification sent to Local Floodplain Managers
October 4, 2019 USACE Concurrence with MRA Conceptual Plan  U.S. Army Corps of Engineers Concurrence with Modified Removal Action Conceptual Plan
August 28, 2019 Dominion Energy's Response to USACE email  Dominion Energy's Response to U.S. Army Corps of Engineers email from 08-08-19
July 24, 2019 Permit Application Strategy
 
Dominion Energy's Permit Application Strategy
 
July 19, 2019 Review of Semiannual Surface Water Assessment Report
 
DHEC's Review of the Semi-Annual Surface Water Assessment Report
 
July 1, 2019 Quarterly Report for 2nd Quarter 2019
 
Dominion Energy's 2nd Quarter 2019 Report
 
June 26, 2019 4th Semiannual Surface Water Assessment Report
 
Dominion Energy's 4th Semi-Annual Surface Water Assessment Report
April 12, 2019 No Rise Certification
 
Dominion Energy's No Rise Certification for the Modified Removal Action Cofferdam Footprint
April 12, 2019 Hydraulic Analysis Report Dominion Energy's Hydraulic Backwater Analysis for the Modified Removal Action Cofferdam Footprint
April 2, 2019 Quarterly Report 1st Quarter 2019: Significant Milestones SCE&G's Quarterly Report on progress made and significant milestones reached during 1st Quarter 2019
February 8, 2019 Review: Conceptual Plan for a Modified Removal Action DHEC's Approval of Modified Removal Action as preferred path forward along with stakeholder support statements
December 18, 2018 Conceptual Plan for a Modified Removal Action SCANA's Summary of the Modified Removal Action that Stakeholders agreed to on November 15, 2018
October 23, 2018 Review: Preliminary Removal Action Work Plan DHEC's Response to Preliminary Removal Action Work Plan
September 18, 2018 Preliminary Removal Action Work Plan SCANA's Updated Removal Action Work Plan
July 31, 2018 Removal Action Alternative DHEC’s request for SCANA to submit an updated work plan for the removal of tar-like material.
June 22, 2018 Removal Action Alternative Letter from DHEC to SCANA requesting them to evaluate the potential for a modified removal action
May 23, 2018 Corps Response to SCE&G dated May 19, 2018 with Enclosures USACOE response to SCANA’s Letter.
May 23, 2018 Review: Second Semi-Annual Surface Water Assessment Report DHEC’s review of the Surface Water Monitoring Report
May 8, 2018 Second Semi-Annual Surface Water Assessment Report Surface Water Monitoring Report
April 13, 2018 US EPA Letter to Mayor Benjamin Concerning Site Cleanup Letter from US EPA to Mayor Benjamin
March 27, 2018 Letter from Mayor Benjamin to  US EPA Administrator Letter from Mayor Benjamin to US EPA Administrator Scott Pruitt
March 26, 2018 Guignard’s Request to Participate in Remedial Measures Discussion Letter from Guignard Associates, LLC, property owner on eastern bank, requesting to be included in site remedial discussions.
March 22, 2018 Response Regarding Letter of 3/19/2018 Southern Environmental Law Center’s response to SCANA’s letter to USACOE.
March 19, 2018 Cofferdam Approach for a Remedial Action Letter from SCANA to USACOE requesting additional information on a modified removal action alternative
December 7, 2017 Under Review: Draft Sediment Capping Work Plan Letter from DHEC to Congaree River Keeper outlining that the capping plan has been received and is currently under review.
November 30, 2017 Draft Sediment Capping Work Plan with Appendices SCANA’s work plan for capping the coal tar in the river
November 27, 2017 Review: First Semi-Annual Surface Water Assessment Report DHEC’s Review of the Surface Water Assessment Report
November 7, 2017 First Semi-Annual Surface Water Assessment Report Surface Water Assessment Report
October 18, 2017 USACOE Nationwide Permit (NWP 38) USACOE approval of the Nationwide Permit for Capping the river
October 5, 2017 Review: GW Monitoring Report, June 2017 Letter from Cassidy to SCANA
September 20, 2017 GW Monitoring Report, June 2017 Groundwater Monitoring Report
August 9, 2017 Letter from DHEC to Riverkeeper with Aquatic Macroinvertebrate Study Attachment Letter from DHEC to Riverkeeper with July 7, 2017 Aquatic Macroinvertebrate Bioassessment Study attached
August 9, 2017 Letter from DHEC to SCANA with Aquatic Macroinvertebrate Bioassessment  Attachment Letter from DHEC to SCANA with July 7, 2017 Aquatic Macroinvertebrate Bioassessment attached
July 7, 2017 An Investigation into the Potential Impacts of Coal Tar Contamination on the Invertebrate Community- DHEC Technical Report DHEC’s study of the invertebrate community and evaluation of environmental impacts on the invertebrate populations in the River.
April 28, 2017 Evaluation of Proposed Congaree Capping Alternative for Control of Coal Tar Sediments Southern Environmental Law Center’s Letter and Report evaluating the Capping Alternative for control of Coal Tar Sediments
April 25, 2017 Submittal from SCANA to DHEC Response 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, 2017 Letter from DHEC to SCE&G Re:  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, 2017 Congaree River Surface Water Sampling Report Analytical results from the DHEC March 2017 surface water sampling.
April 4, 2017 Congaree River Surface Water Sampling Location Map Map illustrating the surface water sampling locations for the DHEC March 2017 sampling event.
March 7, 2017 Congaree River Surface Water Sampling Plan DHEC'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, 2017 Letter from SCANA to DHEC Re:  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, 2016 Letter from US Army Corps of Engineers (USACOE) to South Carolina Department of Natural Resources Engineers Letter Correspondence 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, 2016 Letter 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, 2016 Submittal 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. 2016 Letter from DHEC to SCANA Re:  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, 2016 Submittal from SCANA to DHEC Re:  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, 2015 Submittal from SCANA to DHEC Re:  Field Demonstration Project Work Plan
DHEC's approval of the Field Demonstration Project Work Plan.
July 17, 2015 Submittal from SCANA to DHEC Re:  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, 2015 Letter 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, 2015 Letter from DHEC to SCE&G Re:  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, 2015 Letter from SCANA to DHEC Re:  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, 2013 Letter from DHEC to SCE&G Re:  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 2013 Final Engineering Evaluation/
Cost Analysis (EE/CA)
Summary of cleanup options evaluated by DHEC.
March 2012 Project Delineation Report Summary of all 5 phases of assessment and discussion of results.
September 2011 Phase IV Delineation Preliminary Findings Assessment Report for Phase 5 Proposed Activities.
August 2011 Phase III Delineation Preliminary Findings Assessment Report for Phase 4 Proposed Activities.
June 2011 Phase II Delineation Summary Assessment Report for Phase 3 Proposed Activities.
December 2010 Phase I Delineation Summary Assessment Report for Phase 2 Proposed Activities.
September 2010 Delineation Work Plan Initial Assessment Work Plan to collect sediment samples in the Congaree River.
August 2002 Voluntary Cleanup Contract Agreement 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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