NC0080071_More Information (Requested)_20200309

ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
S. DANIEL SMITH
Director
NORTH CAROLINA
Environmental Quality
March 9, 2020
CERTIFIED MAIL 70181830 0001 8037 0403
RETURN RECEIPT REQUESTED
Mayor Chad Braxton
Town of Vanceboro
PO Box 306
Vanceboro, NC 28586-0306
Subject:
Dear Mayor Braxton:
Request for Additional Information
NPDES Renewal Application
Vanceboro WTP
NPDES permit NCO080071
Craven County
The Division has reviewed your application, received on September 30, 2019, for renewal of
NPDES permit NC0080071. To enable us to complete our review in accordance with N.C.G.S. 143-
215.1 and 15A NCAC 02H .0105, we need additional or revised information regarding your
discharge:
1. Per Section 15 of Short Form C, a solids handling plan is required to be submitted with the
permit renewal application. The plan was not submitted with the renewal application
received on September 30, 2019. In order to proceed with the permit renewal, this plan
must be submitted.
2. On November 30, 2017, discharge monitoring report (DMR) data shows an effluent
discharge of 16 MGD. Please verify this discharge volume, and if not correct, submit an
amended DMR.
3. Please provide five (5) days of Total Hardness (CaCO3 or [Ca + Mg]) data for the water
treatment plant effluent and upstream from Outfall 001 to the unnamed tributary to Mauls
Swamp.
The NC 2007-2014 Water Quality Standard (WQS) Triennial Review was approved by the NC
Environmental Management Committee (EMC) on November 13, 2014. The US EPA subsequently
approved the WQS revisions on April 6, 2016 with some exceptions. The NC Division of Water
Resources NPDES Permitting Unit is required to implement the new dissolved metal standards in
all permits public noticed after April 6, 2016.
The new standards for most metals include acute standards. Further, the freshwater standards for
several metals are expressed as the dissolved form of the metals, and seven metals have hardness -
dependent equations. As a result, the NPDES Permitting Unit will need site -specific effluent
D E Qbi�� North Carolina Department of Environmental Quality Division of Water Resources
512 North Salisbury Street 1 1617 Mail Service Center Raleigh, North Carolina 27699-1617
NoHrN r..x:eO�aNn ^
919.707.9000

Mayor Braxton
March 9, 2020
Page 2 of 2
hardness data and instream hardness data, upstream of the discharge, for each facility monitoring
these metals in order to calculate permit limitations. The metal of concern for the Vanceboro WTP
permit is Total Copper.
If no response is received within 60 calendar days [per 15A NCAC 02H .0107(b)], the permit will
be renewed without the benefit of the additional information. Therefore, a default hardness of 25
mg/L (CaCO3 or [Ca + Mg]) will be used to calculate an effluent limit for Total Copper giving a
daily maximum limit of 10.47 µg/L and a monthly maximum limit of 7.88 µg/L.
If you have any questions, please contact me at 919-707-3619 or via email at
[e-mail].
Sincerely,
f
Brianna Young
Compliance and Expedited Permitting Unit
cc: NPDES Permit Files
DWR/WaRO/WQROPS