NC0021156_Correspondence_20190822

ROY COOPER
Governor
K41CHAEL & REGAN
Secretary
LINDA CULPEPPER
thr{�{rpr
NORTH CAROLINA
Environmental Quad"
22 August 2019
Mr. David Johnson, PE
City of Mount Holly
P.O. Box 406
Mount Holly, NC 28120
SUBJECT: Mount Holly WWTP
Site visit & meeting (August 20, 2019)
Aeration basin failure
Gaston County
Dear Mr. Johnson,
Thank you for the opportunity to tour the Mount Holly WWTP site and the subsequent
discussion on Tuesday, August 20, 2019. This correspondence is being provided to summarize the
visit and meeting in order to determine an appropriate path forward with respect to the Aeration
Basin #3 failure and its subsequent decommissioning.
term:
The Division of Water Resources requests that the following items be addressed in the near
1. Complete an evaluation of the failed Aeration Basin #3 to determine precisely the type
of bottom that currently exists (ie: concrete, bentonite clay, etc);
2. Complete an engineering evaluation of the earthen embankment between the river and
the basin to determine its structural integrity;
3. Complete an economic analysis for removal of solids now versus at time of site
decommissioning;
4. Provide this information to the Mooresville Regional Office for evaluation.
Following the completion of the items above, it will be necessary to meet again to determine
(1) the appropriate path forward based on the facts obtained from the evaluations noted above, and
(2) whether or not additional evaluations may be necessary.
North Caro, ra❑epartrnentofEnvuonmentaiQuality I DivsoaafWater Resouroes
_ Mcoresr;�- Feg•:ra Office 1619 East Center Avenue, Suite 301 I h+ooresv;�e, North Cafohna 25115
�""�'� 704£63-1699

Also, attached please find a correspondence dated June 2, 2017 from you to Mr. Ron Berry,
formerly with the Division's permitting unit. Contained in this correspondence, specifically Item #6,
is information directly related to the removal of the solids in Aeration Basin #3 subsequent to its
failure. The information in red font confirms the concerns we expressed during our visit on August
20, 2019 relative to potential ground and surface water impacts resulting from the basin wall failure.
Should you have questions or concerns, please do not hesitate to contact Ori Tuvia or me at
704-663-1699 or via email at [e-mail] or [e-mail].
Sincerely,
DocuSigned by:
16,11
A14CC681 AF27425...
W. Corey Basinger
Regional Supervisor
Mooresville Regional Office
Division of Water Resources
Cc: MRO file
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