WI0300435_More Information (Requested)_20200707

ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
S. DANIEL SMITH
Director
NORTH CAROLINA
,Environmental Quality
July 7, 2020
Mr. James Wells, VP EHS Programs & Env. Sciences
Duke Energy Carolinas, LLC
52-6 South Church Street, Mail Code EC12J
Charlotte, NC 28202
Subject: Additional Information Request
UIC Permit Other Application No. W10300435
Duke AIlen Steam Station Plant
Gaston County
Sent electronically and via U.S. Postal Service
Dear Mr. Wells:
The Division of Water Resources (DWR) is in receipt of your application to construct and
operate an Underground Injection Control (UIC) groundwater remediation system at the above
referenced site. After review by staff, we find that additional information is needed so that we
can continue the review and permit issuance process. Please address the following items within
30 days of receipt:
1. More detail is needed on how contaminates of interest (COls) and unrelated contaminants
that may be present in surface water (e.g., PPAS/Pl~ OAs) will be monitored and reduced
to prevent injection into the subsurface that may result in exceedances of groundwater
standards per 15A NCAC 02L .0202.
2. More detail is needed in the Application on the Interim Monitoring Plan (RVIP) and the
Environmental Monitoring PIan (EMT). This would include lists of parameters for both,
time frame or schedule for transition from EYW to EMP, etc.
3. More detail is needed on how injection pressures will be managed to avoid creating
preferential pathways.
4. More detail is needed on how backwash from the filter/UV system will be managed and
disposed.
5. A number of injection and recovery wells are proposed to be installed in areas with
potential heavy traffic. Will the well vault construction be sufficient to protect the well
heads? Is there a plan to include reinforced concrete to the well --pad concrete to
accommodate heavy equipment traffic?
6. More detail is needed in the timing of how and when injection wells will be installed in
relation to removal of the coal ash pile_ During well installation and afterwards, the
integrity of wells must be maintained (this includes the slanted wells).
D;:�.
Q
� North Carolina Department of Environmental Quality l Division of Water Resources
512 North Salisbury Street 1 1636 Mail Service Center I Raleigh, North Carolina 27699-1636
919,707,9000

7. The Application does not clearly define where the surface water for the injection wells
will be drawn from. Please submit a modified site map showing the location(s) of the
fresh water intake.
S. Please provide your phone number as this was not included on the UIC Permit
Application.
Please note that failure to provide this additional information on or before the above
requested date may result in your application being returned as incomplete. If additional
time is necessary, the Application may be withdrawn to avoid being returned as incomplete.
Either the Applicant or the Applicant's consultant may request withdrawal by email message or
letter if this is desired.
If you have any questions regarding this request, please do not hesitate to contact me
Michael.Roaers(@ncdenngovor at [phone].
Thank you for your cooperation.
Sincerely,
4
Michael Rogers, PG {N & FL}
UIC Program Manager
Ground Water Resources Section
Division of Water Resources
Department of Environmental Quality
cc: Refer to email for complete list of CC recipients