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.
|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)|