Mayo_Gypsum_Pad_Additional_Assessment_Plan_Approval.docx

ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
S. DANIEL SMITH
Director
Paul Draovitch
Senior Vice President
Environmental, Health & Safety
Duke Energy
526 South Church Street
Mail Code EC3XP
Charlotte, North Carolina 28202
NORTH CAROLINA
Environmental Quality
July 15, 2020
Subject: Gypsum Pad Storage Area Additional Groundwater Assessment Work Plan Comments —
Mayo Steam Electric Plant
Dear Mr. Draovitch:
On February 13, 2020, the North Carolina Department of Environmental Quality (DEQ) Division of Water
Resources (Division) received the proposed Gypsum Pad Storage Area Additional Groundwater
Assessment Work Plan for the Mayo Steam Electric Plant. On February 18, 2020, Eric Rice of the
Division's Raleigh Regional Office provided a recommendation to proceed with the proposed plan with no
additional comments in an email to Kimberlee Witt of Duke Energy
This letter serves as the formal approval to implement the proposed plan in the study area under the
condition that the results are reported in the upcoming Comprehensive Site Assessment that addresses this
potential source area as part of its scope.
If applicable, the results should also be incorporated into the revised geochemical and groundwater fate and
transport models for the site. If the results of the modeling show current or future impacts to groundwater
and/or surface water from this area, then appropriate remedial strategies shall be proposed in a Corrective
Action Plan for primary and secondary sources not associated with the impoundments. In addition, data
from this study area may need to be considered as part of the Effectiveness Monitoring Plan for the facility.
If you have any questions, please contact Eric Rice (Raleigh Regional Office) at [phone] or Steve
Lanter (Central Office) at [phone].
Sincerely,
DocuSigned by:
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Rick Bolich, LG, Chief
Ground Water Resources Section
D E Q�� North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 1 1636 Mail Service Center I Raleigh, North Carolina 27699-1636
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cc: RRO WQROS Regional Office
WQROS Central File Copy