NC0064050_Approval_20220713

DocuSign Envelope ID: D47FC2FE-AEDF-4F42-9E92-83D9F0E655BD
ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
RICHARD E. ROGERS, JR.
Director
Town of Apex
Attn: Lori Avent, Pretreatment Coordinator
P.O. Box 250
Apex, NC 27502
Email: lori. avent@apexnc. org
NORTH CAROLINA
Environmental Quality
7/13/2022
Subject: LTMP Approval
Program Name: Apex
NPDES Permit No NC0064050, 3.6 MGD
Middle Creek WWTP
Wake County, RRO
Dear Permittee,
The Municipal Unit of the Division of Water Resources has reviewed the Long -Term Monitoring Plan (LTMP)
for the Town of Apex. Its wastewater treatment plant (WWTP) works under the NPDES Permit No NC0064050
(effective on May 1, 2022). The LTMP was initially received by the Division on June 29, 2022, followed by more
information and revisions received on July 7, 2022.
The LTMP was updated to include lower practical quantitation limits (PQL) for molybdenum and nickel, update
the plant flow schematic, and update the pollutants of concern (POC) table. The review indicates that the revised
LTMP is adequate and meets the requirements needed to establish a site -specific Headworks Analysis (HWA).
Proper implementation of an LTMP is also required by your NPDES permit. Please refer to the Comprehensive
Guidance for North Carolina Pretreatment Programs (Comprehensive Guide) for additional information and
examples. Modifications to the LTMP must be approved by the Division.
Regardless of approval action today, within 180 days of the effective date of any reissued or 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., an updated IWS, or documentation of why one is not needed). This action may include
revising, updating, or adding to the list of Significant Industrial Users (SIUs). Pursuant to 15A NCAC 2H
.0907(b) either the Division or the permittee may initiate pretreatment program revisions.
Federal and State pretreatment regulations require the local delegated pretreatment program to effectively control
and document the discharge of wastewater from Significant/ Categorical Industrial Users to the POTW. It is the
POTWs responsibility to ensure these objectives are constantly met.
Thank you for your continued cooperation with the Division's Pretreatment Program. If you have any questions or
comments, please contact Keyes McGee at [phone] [email: [e-mail]].
Sincerely,
cDocuSigned by:
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C464531431644FE...
for Richard E. Rogers Jr., Director
Division of Water Resources
dy/Apex.64050.ltmp.2022
Attachments:
Apex.64050.LTMP. approved.2022
cc with attachments:
Town of Apex, Director of Water Resources/ Michael Deaton
DWR Raleigh Regional Office — Pretreatment/ Cheng Zhang
Municipal Unit File and Central Files (Laserfiche)