NC0004774_WSW Permit App - Add Info Request_20171219

N. - Irv.
Water Resources
Environmental Quality
December 19, 2017
Bristol Grohol
Duke Energy Carolinas
526 South Church Street, EC -13K
Charlotte, North Carolina 28202
ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
LINDA CULPEPPER
Interim Director
Subject: Request for Additional Information
Duke Energy Carolinas — Buck: Application for Permit to Construct a Water Supply Well
Rowan County
Dear Ms. Grohol:
This letter is written to request further information related to the application for permit to construct a
water supply system with a design capacity of 100,000 gallons per day (gpd) or greater at the Buck Steam
Station located in Rowan County. The recently submitted permit application was received by the
Division of Water Resources (DWR) Mooresville Regional Office (MRO) via email on December 12,
2017. Pursuant to Title 15A of the North Carolina Administration Code (NCAC) Subchapter 2C Well
Construction (2C) Standards .0105(g)(5), DWR is requesting additional information as it is necessary
before taking final action on your application.
I SA NCAC 02C .0107(a)(4) requires a well or well system with a designed capacity of 100,000 gpd or
greater to be located a sufficient distances from known or anticipated sources of groundwater
contamination to prevent violation of applicable groundwater quality standards, resulting from movement
of contaminants, in response to the operation of the well or well system at the proposed rate and schedule
of pumping. The water supply wells are proposed in close proximity to the ash basin (approximately -570
feet). At this time, information available to DWR does not suggest the groundwater in the vicinity of the
proposed water supply well has been contaminated and concentrations that have been observed are
generally within established background concentrations. However, there is insufficient data to conclude
operation of this water supply well will not result in movement of contaminants from the ash basin.
Therefore, DWR requests Duke Energy Carolinas provide the following information:
• Assessment (i.e., aquifer testing, modeling, etc.) of the effects of pumping at the proposed rate
and schedule on potential radius of influence, groundwater flow, and potential contaminant
migration from the ash basin.
• A report detailing assessment activities, results, and findings should be submitted to the Division
for review.
• This report should be submitted under seal and signature of certifying licensed professional (P.E.
or P.G.).
Duke Energy Carolinas must demonstrate with reasonable certainty that operation of the proposed water
supply well potential radius of influence will not extend immediately adjacent or beneath the ash basin
-"` Nothing Compares"
State of North Carolina I Environmental Quality
1611 Mail Service Center I Raleigh, North Carolina 27699-16111919-707-9000

and will not result in movement of contaminants from the ash basin. If this cannot be adequately
demonstrated, the permit application may be considered incomplete thus not approvable by the Division.
Your response is requested no later than February 16, 2018.
We appreciate your attention and prompt response in this matter. Should you have any questions
concerning this letter, please do not hesitate to contact Mrs. Brandy Costner at [phone] or Mr.
Andrew Pitner at [phone], or via email at [e-mail] or
andrew.pitner. ncdenr.gov.
Sincerely,
Andrew H. Pitner, P.G., Assistant Regional Supervisor
Mooresville Regional Office
Water Quality Regional Operations Section
Division of Water Resources, NCDEQ
cc: WQROS Central Office Copy