NC0021181_Pretreatment_HWA_letter_20200415

ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
S. DANIEL SMITH
Director
NORTH CAROLINA
Environmental Quality
April 15, 2020
Via Electronic mail ([e-mail])
Daniel Perry
Pretreatment Coordinator
City of Belmont
PO Box 431
Belmont, NC 28012
Subject: Pretreatment Review of Headworks Analysis
City of Belmont, NPDES Number NCO021181
Gaston County
Dear Mr. Perry:
The Pretreatment, Emergency Response, and Collection Systems Unit (PERCS) of the Division of
Water Resources has reviewed the Headworks Analysis (HWA) for the Town of Belmont. The
HWA reflects the new NPDES permit limits and dissolved metal stream standards, and it was
received by the Division on December 18, 2019. We apologize for the late response.
The Division concurs with the HWA calculations for all pollutants of concern with the following
corrections and comments. These approved Maximum Allowable Headworks Loadings (MAHLs),
and the basis for these values are found on the last page of the HWA spreadsheet. The results of
the HWA are also listed in the bottom section of the enclosed Allocation Table. The updated HWA
with highlighted changes was emailed to you.
1. Steam Standards: were entered in column F of the Pass -Through Loading Section based on
the calculator submitted on December 18, 2019.
2. TN and TP loadings: were calculated by dividing the NPDES permit loading limits by the
number of days by the convertor 8.34 by the permitted flow.
3. LTMP: TN and TP should be added to the LTMP as they are limited in the NPDES permit. Please
submit an updated LTMP on or before July 15, 2020.
4. Next HWA Due Date: Your next updated HWA is due on May 1, 2021, unless conditions at the
POTW change significantly and thus warrant an earlier submittal (see Comprehensive Guide,
Chapter 5).
Oaparhnenl o<Envlmmm�nla49ualiH
North Carolina Department of Environmental Quality Division of Water Resources
512 North Salisbury Street 1 1650 Mail Service Center Raleigh, North Carolina 27699-1650
919.707.9000

Thank you for your continued support of the Pretreatment Program. If you have any questions
or comments, please contact me at [phone] [email: [e-mail]].
Sincerely,
1 DocuS^igned by:
E42E88CDBD404A7...
Vivien Zhong, Engineer
vz/Belmont_HWA_013
ec: PERCS Unit File
Wes Bell, Mooresville Regional Office
Central Files