NC0026051_Pretreatment_IUP_Modification_Letter_20211006

DocuSign Envelope ID: 4C46C2CF-C6A0-4E95-9584-07D50B18D8F8
R.OY COOPER.
Governor
ELIZABETH S. BISER
Secretary
S. DANIEL SMITH
Director
Via Electronic Mail ([e-mail])
Ms. Amy Moore
Laboratory & Compliance Manager
Durham County
5926 NC Hwy 55 East
Durham, NC 27713
Subject:
NORTH CAROLINA
Environmental Quality
10/6/2021
Pretreatment Review of Industrial User Pretreatment Permit Modification
Program: Durham County
WWTP: Durham County Triangle WWTP, NPDES #: NC0026051
Durham County
Dear Ms. Moore:
The Municipal Unit of the Division of Water Resources has reviewed the Industrial User Pretreatment Permit
(IUP) modification submitted by Durham County for the following Significant Industrial User (SIU). The IUP
was received by the Division on September 1, 2021.
SIU #
SIU NAME
DC-053
United Therapeutics Corporation
The review indicates that the IUP is adequate and meets the minimum requirements of 15A NCAC 2H .0905 and
.0916 and 40 CFR 403.8(f)(1)(iii). The allocation table, maintained in the Division's database, has been updated
accordingly.
Regardless of this approval action today, within 180 days of the effective date of any reissued NPDES permit (or
any subsequent NPDES permit modification) 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 (SIU's).
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
POTW's responsibility to ensure that these objectives are consistently met.
If you have any questions or comments, please contact Michael Montebello at (919) 707 -3624 [email:
[e-mail]]. Thank you for your continued support of the Pretreatment Program.
ksl/durhamcounty_iupmod_130
Ec: Municipal Unit File
Cheng Zhang, RRO
Central Files (Laserfische)
NORTH 1:tE
nepertment of Environmental jolek"
CAROLINA
Sincerely,
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for S. Daniel Smith, Director
Division of Water Resources
North Carolina Department of Environmental Quality Division of Water Resources
512 North Salisbury Street 11617 Mail Service Center I Raleigh, North Carolina 27699-1617
919.707.9000