NC0026441_Pretreatment_Industrial_Waste_Survey_20230515

DocuSign Envelope ID:8B7AOFB7-38C7-48D6-82D7-B95BB78829DC
ROY COOPER _
Governor d C
ELIZABETH S.BISERr
Secretary •E .
RICHARD E.ROGERS,JR. NORTH CAROLINA
Director Environmental Quality
5/15/2023
Via Electronic Mail(cmccorquodale&silerci , .or )
Mr. Chris McCorquodale
Director of Public Works &Utilities
Town of Siler City
P.O. Box 769
Siler City,NC 27344
Subject: Industrial Waste Survey(IWS)Approval
Program: Town of Siler City
Wastewater Treatment Plant: Town of Siler City WWTP
NPDES#: NCO026441
Chatham County
Dear Mr. McCorquodale:
The Municipal Unit of the Division of Water Resources has reviewed the IWS for the Town of Siler City's
Public Owned Treatment Works (POTW), working under the NPDES Permit Number NC0026441. The
IWS was initially submitted to the Division on February 28th, 2023, followed by more information and
revisions received on March 16th,2023,March 22',2023, and May 1 Ith, 2023.
Siler City's IWS includes 23 industrial, commercial, and institutional (ICI) users and currently has 2
significant industrial users (SIUs) under an Industrial User Permit (IUP) and zero industrial users (IUs)
under Local Permits. Siler City's NPDES permits require the 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 SILT, as defined by
NCAC 15A 2H .0903(b)(30) (A) through (D), is identified and subsequently added to the POTW's
pretreatment program. This includes evaluating new]Us before they commence discharge and evaluating
existing Ns determined to be not SLUs that make changes to their process.
Next IWS Due Date: February 28t", 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.
North Carolina Department of Environmental Quality I Division of Water Resources
NORTH cnaow
D E Q�� 512 North Salisbury Street 11611 Mail Service Center I Raleigh,North Carolina 27699-1611
Dgarh�anl a/EmYaane ntal F 919.707.9000
Oual�

DocuSign Envelope ID:8B7AOFB7-38C7-48D6-82D7-B95BB78829DC
If you have any questions or comments, please contact Keyes McGee at [phone] [email:
keyes.mc.eg_ekncdenr.govI or Octavio Henriquez at (919) 707-3662 [email:
octavio.henriqueznncdenr.govI Thank you for your continued support of the Pretreatment Program.
Sincerely,
DocuSigned by:
Attachments: �� � �
iws_siler_city_final.xlsx
cc with attachments: C464531431644FE...
oih/siler_city_iws_2023 for Richard E. Rogers Jr.,Director
Ec: Municipal Unit File Division of Water Resources
Cheng Zhang,RRO
Central Files(Laserfiche)
D E Q�� North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 1 1611 Mail Service Center I Raleigh,North Carolina 27699-1611
NORTH CAROUNA _
o,p,�„F r��,�wla�,\ /./ 919.707.9000