NC0086894_More Information (Requested)_20190531

ROY COOPER
Governor
MICHAEL S. REGAN
Secretaq:
LINDA CULPEPPER
Director
NORTH CAROLINA
Environmental Quality
May 30, 2019
CERTIFIED MAEL 70181830 000180371318
RETURN RECEIPT REQUESTED
Mr. Gary Davenport
Robeson County Water Department
265 McGirt Rd
Maxton, NC 28364
Subject: Request for Additional Information
NPDES Renewal Application
Raemon Well WTP
NPDES permit NCO086894
Robeson County
Dear Mr. Davenport:
The Division has reviewed your application, received on January 23, 2019, for renewal of NPDES permit
NC0086894. 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. Please provide lab data sheets for the following months:
a. January 2015
b. April2018
In reviewing the DMR data for Raemon Well WTP, we have noticed a few odd values that could have potentially
been submitted in error. We are requesting the lab sheets for the above months for further review. The value
reported for Fluoride for April 2018 is 9 mg/L. The value reported for Copper in the January 2015 DMR is 45
µg/L. If these values have been reported in error, please submit revised DMRs to the Division.
2. 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 First 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.
North Carolina Department of Environmental Quality I Division of Water Resources
1617 Mail Service Center I Raleigh, North Carolina 27699-1617
919-707-3712

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 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 Raemon Well 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, potentially giving a daily maximum limit of 10.47
µg/L and a monthly maximum limit of 7.88 µg/L.
3. Please provide a 7Q10 and 30Q2 at the location of Outfall 001, for the unnamed tributary to First Swamp
[Stream Index: 14-34-11-3], a waterbody classified C;Sw, located within subbasin 03-07-55 [HUC:
0304020303] of the Lumber River Basin, by contacting the following staff member with the US
Geological Survey:
J. Curtis Weaver, Hydrologist, PE
USGS North Carolina Water Science Center
3916 Sunset Ridge Road
Raleigh, NC 27607
Phone: [phone] // Fax: [phone]
E-mail address -- jcweaver(&usgs.gov
Internet address -- http://nc.water.us s.jz
This information is required in order to continue processing the permit renewal. Please provide the requested
information with 60 calendar days [per 15A NCAC 2H.4107(b)]. If you have any questions, please contact me at
919-707-3712 or via email at sydney cgMenterAmcdennizov.
Sincerely,
Sydney Carpenter
Compliance and Expedited Permitting Unit
cc: NPDES Permit Files
Central Files
DWR/FRO/WQROPS