NC0058416_More Information (Requested)_20171219

Water Resources
ENVIRONMENTAL QUALITY
December 19, 2017
CERTIFIED MAIL 7015 0640 0007 9833 5615
RETURN RECEIPT REQUESTED
Ms. Lindsay Mize
South Granville Water and Sewer Authority
415 Central Avenue, Suite B
Butner, NC 27509
Dear Ms. Mize:
ROY COOPER
Govei not
MICHAEL S REGAN
Seci etary
LINDA CULPEPPER
biter an Director
Subject: Request for Additional Information
NPDES Renewal Application
SGWASA WTP
NPDES permit NCO058416
Granville County
The Division has reviewed your application, received on August 8, 2017, for renewal of NPDES
permit NC0058416. To enable us to complete our review in accordance with N.C.G.S. 143-215.1
and 15A NCAC 2H .0 105, we need additional or revised information regarding your discharge:
1. 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 Knap of
Reeds Creek.
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
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 SGWASA WTP
permit is Total Copper.
If no response is received within 60 calendar days [per 15A NCAC 2H.0I07(b)], the permit will be
renewed without the benefit of the additional information. Therefore, a default hardness of 25 mg/L
State of North Carolina I Environmental Quality I Water Resources
1617 Mad service Center I Raleigh, North Carolina 27699-1617
919 806 6300

Ms. Lindsay Mize
December 19, 2017
Page 2 of 2
(CaCO3 or [Ca + Mg]) will be used to calculate an effluent limit for Total Copper giving a daily
maximum limit of 10.47 gg/L and a monthly maximum limit of 7.88 gg/L.
2. If possible, please provide a 7Q10 and 30Q2 at the location of Outfall 001, for the unnamed
tributary to Knap of Reeds Creek [Stream Index: 27-4-(8)], a waterbody classified WS -IV;
NSW, CA, located within subbasin 03-04-01 [HUC: 0302020104] of the Neuse River Basin,
contact 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 -- [e-mail]
Internet address -- http://nc.water.usgs.gov/
If you have any questions, please contact me at 919-807-6333 or via email at
[e-mail].
Sincerely,
I `
Brianna Young
Compliance and Exp)1ed Permitting Unit
cc NPDES Perrmt Files
Central Files
DWR/RRO/WQROPS