1812_DukeMarshall_2022Q4_GWCR_FID1771734_20230201

(� DUKE
ENERGY
February 1, 2023
North Carolina Department of Environmental Quality
Division of Waste Management
Solid Waste Section
2090 U.S. Highway 70
Swannanoa, NC 28778
Attn: Ms. Sarah Moutos (submitted electronically)
Re: Groundwater Condition Quarterly Report — October 2022 through December 2022
Industrial Landfill No.1
Permit No.: 1812-INDUS-2008
Marshall Steam Station
Terrell, North Carolina 28682
Dear Ms. Moutos:
526 South Church St.
Charlotte, NC 28202
Mailing Address
P.O. Box 1006
Mail Code EC 13K.
Charlotte, NC 28201-1006
In accordance with the NCDEQ DWM September 17, 2021, Phase 2 Permit Modification Approval letter, Duke
Energy is providing the quarterly report describing groundwater conditions in the area of the Marshall Steam
Station Industrial Landfill No.1 (ILF, 1812-INDUS-2008) Phases 2, 3, and 4. The report is for the quarterly
period of October 2022 through December 2022 (Q4 2022).
The quarterly report includes an analysis of groundwater levels and dewatering pump flowrates within Phases
2, 3 and 4, with updated water level maps, hydrographs, pump flowrate plots, and well construction and water
level data tables. An evaluation of groundwater levels and pump flowrates compared to model predictions is
included. All groundwater transducer data, groundwater model trend data, and dewatering pump data are
provided in an excel file format as the report Appendices.
Groundwater conditions in the vicinity of Marshall Steam Station's Industrial Landfill No.1 continue to be
monitored and evaluated. The next quarterly report (Q1 2023) will be submitted by May 1, 2023.
If you need additional information regarding this submittal do not hesitate to email or call me at
Ashley. Healy(cDduke-energv.com or [phone].
Respectfully submitted,
j4VAi
Ashley Healy, P.G.
Environmental Services
Attachments: Industrial Landfill No.1 (1812-INDUS-2008) Groundwater Conditions Quarterly Report — October
2022 through December 2022 (SynTerra; February 2023)
Appendices in excel format:
1) Appendix A Water Level Monitoring Data Files
2) Appendix B Groundwater Model Predicted Trend Files
3) Appendix C Dewatering/Underdrain Pumping Data Files
4) Appendix D Mann -Kendall Results
www.duke-energy.com Page 1 of 2

cc (via e-mail): Claire Osborn, NCDEQ
Elizabeth Werner, NCDEQ
Sherri Stanley, NCDEQ
Ed Mussler, NCDEQ
Scott Saunders, Duke Energy
Dan Zakary, Duke Energy
Chris Varner, Duke Energy
Tyler Hardin, Duke Energy
Ed Sullivan, Duke Energy
Thomas Colton, SynTerra
Craig Eady, SynTerra
www.duke-energy.com Page 2 of 2