NC0069892_More Information (Requested)_20170714

Water Resources p
Environmental Quality
July 14, 2017
CERTIFIED MAIL 7002 0860 0006 58361097
RETURN RECEIPT REQUESTED
Mr. Bill Bailey, Town Administrator
Town of Andrews
P. O. Box 1210
Andrews, NC 28901-1210
Dear Mr. Baily:
ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
S. JAY ZIMMERMAN
Director
Subject: Request for Additional Information
Renewal Application
Andrews WTP
NPDES permit NCO069892
Cherokee County
The Division has reviewed your application, received on May 15, 2017, for renewal of NPDES permit
NCO068861. To enable us complete our review in accordance with N.C.G.S. 143-215.1 and 15A NCAC
2H.0105, please provide additional or revised information to address the following comments:
1. Please provide five (5) days of Total Hardness (CaCO3 or (Ca + Mg)) data for the effluent at
Outfall 001.
2. If flow is present in the receiving stream, please provide five (5) days of Total Hardness (CaCO3 or
(Ca + Mg)) data upstream from Outfall 001.
3. Review of our records indicates that there is no stream flow data available for the receiving stream.
Please provide a 7Q10 and 30Q2 at the location of Outfall 001 [35.210556°, -83.836667°], for the
unnamed tributary to Dan Holland Creek from the following contact 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 [e-mail]
Internet address -- http://nc.water.usgs.gov/
The NC 2007-2014 Water Quality Standard (WQS) Tnenmal 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 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. Furthermore, 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 Division will need site-specific effluent hardness data and instream
State of North Carolina I Environmental Quality
1617 Mail service Center I Raleigh, North Carolina 27699-1617
919-707-9000

Mr. Bailey
July 14, 2017
Page 2 of 2
hardness data, upstream of the discharge, for each facility monitoring these metals in order to calculate
permit limitations. The metal of concern for this permit renewal is Copper.
To evaluate dissolved Copper, a Reasonable Potential Analysis (RPA) was conducted using data from
DMRs (Aug2014—May2017). Results indicated a reasonable potential to exceed the new dissolved metal
standard for Copper Consequently, the following daily maximum limits (acute standard) and monthly
average limits (chronic standard) for Total Copper could be applied for this permit renewal:
Parameter Outfall Monthly Average Daily Maximum Limit
Copper 001 7.88 µg/L 10.47 µg/L
To calculate these limits a default hardness of 25 mg/L was entered for both the effluent and upstream
values. Additionally, a 7Q 10 of zero was used for this calculation. For a summary of this information,
please see the attached "Dissolved to Total Metal Calculator". Incidentally, the additional information
requested will be used in a recalculation for the draft permit.
If no response is received within 60 calendar days [per 15A NCAC 2H.0107(b)], the permit will be
renewed without the benefit of the requested additional information Therefore, a default hardness of 25
mg/L and a 7Q 10 of zero will be used to calculate effluent limits for Copper as indicated.
If you have any questions, please contact Derek Denard at 919-807-6307 or email at
derek.denard(&ncdenr.gov.
Sincerely,
Derek Denard, Environmental Specialist
Compliance & Expedited Permitting Unit
Division of Water Resources, NCDEQ
he Central Files
NPDES Program Files
ARO Files
Michael Lodd, Earth Environmental Services, 75 Bison Ln, Murphy, NC 28906
ec Landon Davidson [landon davidson@ncdenr gov]
ceaderwynn@yahoo com

Date 7/13/2017
FACILITY: Town of Andrews - Andrews WTP
NPDES PERMIT. NCO069892
Dissolved to Total Metal Calculator
Iin decordarree with Federal Regulations, permit Ilrnnatlons must he writtian as Total Metals per 40 CFR 122.45(c)
Receiving Receiving
Stream Stream
Rec Stream
NPDES Total Suspended
Solids
Combined
Hardness
Combined
Hardness
Instream
Wastewater
Instream
Wastewater
Upstream
Effluent
Hardness
summer summer 7Q10
1Q10
Flow Limit
-Fixed Value-
chronic
Acute
Concentration
Concentration
Hardness
Average (mg/L)
Average
7Q10 (CFS) (MGD)
MGD
[MGD] (mg/L)
(mg/L)
(mg/L)
(Chronic)
(Acute)
NIA
(mg/L)
00000 1 0 0000
0 0000
0 1508 10
25 000
25 000
100 0000
_1000000
25
25
Upstream Hard Avg (mg/L) = 25
EFF Hard Avg (mg/L) = 25
PARAMETER
US EPA
Dissolved Metals Translators- using
Default Partition
Chronic Acute Coefficients
u A lughl (streams)lug/I
Maximum Allowable Effluent Concentration
(MAEC) as aFaW NeW
=Dissolved Metal- Translator
COMMENTS (identify parameters to PERCS Branch to maintain in facility's LTMP/STMP)
Chronic I Acute
u A
Cadmium (d)
015 082 0 252
059 324
Cd -Trout streams
015
051
0 252
059
201
Chromium III (d)(h)
24
183
0202
11773
90508
Chromium VI (d)
11
16
1 000
11 00
1600
Chromium, Total (t)
NIA
N/A
Copper (d)(h)
27
36
0 348
7881
1047
Lead (d)(h)
054
14
0 184
2941
7549
Nickel (d)(h)
16
145
0 432
37231
335 21
Ni - WS streams (t)
25
N/A
Silver (d)(h,acute)
006
0301
1 0001
006
030
Zinc (d)(h)
36
361
02881
12673
12571
Beryllium
651
651
1 0001
651
65
Arsenic (d)
1 1501
3401
1 0001
1501
340
(d) = dissolved metal standard See 15A NCAC 02B 0211 for more information
(h) = hardness -dependent dissolved metal standard See 15A NCAC 02B 0211 for more information
(t) = based upon measurement of total recoveable metal See 15A NCAC 02B 0211 for more information
The Human Health standard for Nickel in Water Supply Streams is 25 mg/L which is Total Recoverable metal standard
The Human Health standard for Arsenic is 10 pg/L which is Total Recoverable metal standard