NC0046728_Approval_20230106

DocuSign Envelope ID: 3612C5C2-B665-4C9D-87F9-9B02175DA964
ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
RICHARD E. ROGERS, JR.
Director
NORTH CAROLINA
Environmental Quality
January 26, 2023
City of Mooresville
Attn: Jeff Campbell, Environmental Compliance Inspector
P.O. Box 878
Mooresville, NC 28115
Transmitted via email to [e-mail]
Subject: IWS Approval
POTW: Rocky River WWTP
NPDES No NC0046728
Iredell County, MRO
Dear Permittee,
The Municipal Unit of the Division of Water Resources has reviewed the Industrial Waste Survey (IWS) for the
City of Mooresville's Public Owned Treatment Works (POTW), working under the NPDES Permit No NC0046728
(effective on November 1, 2019). The IWS was initially submitted to the Division on March 30, 2022, followed by
more information and revisions received on October 3, 2022, January 3, 2023, and January 25, 2023.
The City's IWS included 178 industrial, commercial, and institutional (ICI) users and currently has three significant
industrial users (SIUs) under Industrial User Permits (IUPs) and five industrial users (IUs) under Local Permits.
The City's NPDES permits require proper completion of an IWS.
The review indicates that the IWS is adequate and meets the requirements of 40 CFR 403.8 (f) (2). Please remember
it is the responsibility of the POTW to continue efforts to ensure that any SIU, as defined by NCAC 15A 2H
.0903(b)(30) (A) through (D), is identified and subsequently added to the City's pretreatment program. This includes
evaluating new IUs before they commence discharge and evaluating existing IUs determined to be not SIUs that
make changes to their process.
Next IWS Due Date: January 25, 2028, unless conditions at the POTW or industrial users change significantly and
thus warrant an earlier submittal. Furthermore, within 180 days of the effective date of any reissued/modified
NPDES permit, the Permittee would be required to submit to the Division a written technical evaluation of the need
to revise local limits (i.e., updated IWS, HWA, LTMP, or documentation of why the update is not needed). This
action may include revising, updating, or adding to the list of SIUs. Pursuant to 15A NCAC 02H .0907(b), either
the Division or the Permittee may initiate pretreatment program revisions.
Thank you for your continued cooperation with the Pretreatment Program. If you have any questions or comments,
please contact my staff Diana Yitbarek at [e-mail] or Keyes McGee at
keye s.mc gee @ncdenr. goy.
Sincerely,
cnAD,oc'u,'Siigned byy:A `', 'q,'' `
C464531431644FE...
for Richard E. Rogers Jr., Director
Division of Water Resources
Attachments:
Moore sville.I W S .007.2022.xlsx
cc with attachments:
Town of Mooresville/ Pretreatment/ Lane Corey
Mooresville Regional Office/NPDES Pretreatment/ Wes Bell
Municipal Unit File and Central Files (Laserfiche)