NC0077992_Renewal (Application)_20170127

u
a
'Water Resources
Environmental Quality
January 27, 2017
CERTIFIED MAIL 7009 2250 0000 8087 0873
RETURN RECEIPT REQUESTED
Mr. Clint Berry, Utilities Director
Hyde County Water System
P.O. Box 66
Swan. Quarter, North Carolina 27885
Dear Mr. Berry:
ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
S. JAY ZIMMERMAN
Director
Subject: Request for Additional Information
NPDES Renewal Application
Ponzer WTP
NPDES permit NCO077992
Hyde County
The Division has reviewed your application, received on May 12, 2014, for renewal of NPDES permit
NC00877992. To enable us to 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 water treatment
plant effluent and upstream (if available) from Outfall 001 for the unnamed tributary (UT) to Pungo
Lake Canal.
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. 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 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 metals of concern for Ponzer WTP permit are Total Copper and
Total Zinc.
A Reasonable Potential Analysis (RPA) was conducted for Total Copper data (Jun2012 Nov2016) and
results indicated the potential to exceed the water quality standard for aquatic life. As a result, a daily
maximum limit of 10.47 µg/l (acute total allowable metal concentration) and a monthly average limit of
7.88 µg/l (chronic total allowable metal concentration) for Total Copper would be added to the permit for
renewal [see RPA attachments].
Nothing Compares
State of North Carolina I Environmental Quality
1617 Mail Service Center I Raleigh, North Carolina 27699-1617
919-707-9000

Mr. Berry
January 27, 2017
Page 2 of 2
A RPA was also conducted for Total Zinc data (Jun2012 Nov2016) and results indicated the potential to
exceed the water quality standard for aquatic life. As a result, a daily maximum limit of 125.7 gg/1(acute
total allowable metal concentration) and a monthly average limit of 125.7 gg/1(acute total allowable
metal concentration) for Total Zinc would be added to the permit for renewal [see RPA attachments].
Please note that the hardness -dependent water quality standard for zinc typically results in a more
stringent permit limit for the acute total allowable metal verses the chronic. In this situation, use the acute
total allowable metal concentration (permit limit) as the limitation for the Daily Maximum and the
Monthly Average.
Additionally, review of previous permit renewal indicated that the outfall discharges into a field drainage
ditch that is under zero flow conditions (7Q10/30Q2 =0). Since there is no stream flow at the point of
discharge, the RPA does not apply any instream dilution and a default upstream hardness of 25 mg/L is
used in the calculation of effluent limits.
If no response is received within 60 calendar days [per 15A NCAC 211.0107(b)], the permit will be
renewed without the benefit of the requested additional information. Therefore, a default effluent
hardness of 25 mg/L (CaCO3 or (Ca + Mg)) would be used to calculate effluent limits as described above
for Total Copper and Total Zinc.
If you have any questions, please contact Derek Denard at 919-807-6307 or email at
derek.denard(a),ncdenr.gov.
Sincerely,
Derek Denard; Environmental Specialist
Compliance & Expedited Permitting Unit
Division of Water Resources, NCDEQ
hc: &F—DES_Permit.FilesO
Central Files
DWR/WaRO/WQROS
ec: DWR/WaRO David May [[e-mail]]
DWR/WaRO, Robert Tankard [[e-mail]]
Clint Berry, Utilities Director, Hyde County Water System [[e-mail]]

Date: 1/27/2017
FACILITY: Hyde County Water System - Ponzer WTP
NPDES PERMIT: NCO077992 Dissolved to Total Metal Calculator
In accordance with Federal Regulations, permit limitations must be written as Total Metals per 40 CFR 122A5(c)
Receiving Receiving Rec. Stream NPDES TT[E]
ed :25.000
mbined'
Stream Stream Instream Instream Effluent
summer summer 7Q10 1010 Flow Limit ss rdness Wastewater Wastewater Upstream Hardness
.7Q10 (CFS) (MGD c cute Concentration Concentration Hardness AverageMGD GD l) ss
(Chronic) (Acute) Average.(mg/L) (m! )
0.0000 0.0000 0.0000 0.2259 10 25.000 100.0000 100.0000 25 25
Upstream Hard Avg (mg/L) = 25
EFF Hard Avg (mg/L) = 25
US EPA Maximum Allowable Effluentconcentraton COMMENTS (idenfify parameters to PERCS Branch to maintain in facllitys LTMP/STMP):
Dissolved Metals Translators using (MAEC as a Total Metal,
PA"METEk' , DefaulEPartition . )
Dissolved I IDW Translatorn Chronic Atvte • Coefficients- C
u u streams Cadmium d 0.15 0.82 0.252 3.24-Troutstream 0.15t7,51 0.252 2.01Chromium III d (h) 24 183 0.202 05.08Chromium VI d 11 16 1000 16.00Chromium, Total t N/ACo per d h 2.73.6 0.348 10.47Lead d) h 0.54 14 0.184 5.49Nickel d h 16145 0.432 5.21
Ni,- WS streams,. t : ' 25 :N/A
Silver d) h,acute 0.06 0.30 1.000 0.061 0.30
Zinc (d)(h) 361-36 0.288 126.73 125.71
Be Ilium ° 6 5 65 1.000 6,5 65
A►senic (d) ��150 340. 1;1200 150 - , 340
(d) = dissolved metal standard. See ISA 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 ISA 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.

Hyde County Water System - Ponzer WTP Z
NCO077992 Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
MAXIMUM DATA POINTS = 58
Qw (MGD) = 0.23
WWTPIWTP Class: PC -1
1Q10S (cfs) = 0.00
IWC% @ 1Q10S = 100
7Q10S (cfs) = 0.00
IWC% @ 7Q10S = 100
7Q10W (cfs) = 0.00
IWC%@ 7Q10W = 100
30Q2 (cfs) = 0.00
IWC% @ 30Q2 = 100
Avg. Stream Flow, QA (cfs) = 0.00
IW%C @ QA = 100
Receiving Stream: UT to Pungo Lake Canal HUC 030201040403
Stream Class: C; Sw, NSW
Outfall 001
Qw = 0.225933 MGD
COMBINED HARDNESS (m&L)
Acute = 25 mg/L
Chronic = 25 mg/L
PARAMETER
TYPE
NC STANDARDS OR EPA CRITERIA
y
REASONABLE POTENTIAL RESULTS
J
O'
~
RECOMMENDED ACTION
Chronic trd Acute
n # Det. Max Pred Cw Allowable Cw
(1)Applied
a
:3
Acute: NO WQS
Chlorides
NC
230 FW
1
mg/L
54 54 2,132.1
---
_
Chronic -----230:0 -
— -------- — ---' — —
RP shown:= apply Monthly Monitoring with Limit
9 value(s) > Allowable Cw
Acute: 10.47
Copper
NC
7.8806 FW 10.4720
2
ug/L
54 2
19.19
RP shown'- apply Monthly Monitonng h
wit'Limit, .
_ _ _ _ _
Chronic 7.88
RPshown =apply.Monthly'Monitoring ;with, Limit
2 value(s) > llowable Cw
A
Acute: NO WQS
Fluoride
NC
1800 FW
400
ug/L
58 58
2,000.0
_ _ _ _
Chronic: 1,800.0
RP shown -apply Monthly Manitonng with,Limit
5 values > Allowable Cw
Zinc
NC
126.7335 FW 125.7052 10
ug/L
54 17
126.9
Acute: 125.7
RP shown - apply MonthlyMonitoringwith Limit
._
_ _
Chronic•
— -- -- —,
RP shown y Monthly Monionng —
WithCmit�
No value> Allo
Allowable Cw
,
..
„?z �,,' ,- -w�'.. _ .".. r, r. ;.
�_
;� -. '�'�}
;,-•�,•��:�%-.:,�
.'
„pl .�..-.. ,..__ ,..�
NCO077992 9595 Final FW RPA w upstream avg data column_diss to totaimetals_nodetects_limiteddefaults 2016_822, rpa
Page 1 of 1 1/27/2017

- -
FreshwaterProbability/95% Confidence Usina Metal Translators
MAXIMUM DATA POINTS =-58
REQUIRED DATA ENTRY CHECK WQS
Table 1. Project Information Table 2. Parameters of Concern
❑CHECK IF HQW OR ORW WQS Name WQS Type Chronic Modifier Acute PQL Units
Facility Nam #REF! Parol
WWTPMITP Class PC -1 Parol
NPDES Permit #REF! Par03
Outfall
001
Par04
Flow, Qw (MGD)
Par05
#REF!
,Receiving Stream
Perils
UT to Pungo Lake Canal
HUC Number
Par07
030201040403
Stream Class
Par08
Par09
C; Sw, NSW
❑Apply WS Hardness WQC
7Q1 0s; (cfs)
0.00
Par10
7Q1 Ow (cfs)
Par11
0.00
30.Q2 (cfs)
Par12
0.00
QA (cfs)
Q Par13
0.00
1Q10s (cfs)
Par14
0.00
(Effluent_ Hardness_
25 mg/L (Avg)
Par15
'Upstream Hardness—_ —_ _
_ _ _ _ _ m 25 mg/L (Avg) o m
I Par18
(Combined Hardness Chronic
a a
a INCOMPLETE
Par17
(Combined Hardness Acute
m _DATA
DATA INCOMPLETE G o ®� c �I
Par18
Data Source(s)BIMS
�I
Data 06-2012 to 11-2016 a
Pads
Par20
Par21
❑CHECK TO APPLY MODEL
Par22
Par23
Follow directions for data entry. In some cases a
comment menu Ustthe available choices or a
Par24
Par25
dropdown menu will provide a list you may select
from. Error message occur if data entry does not
meet input criteria.
Chlorides Aquatic Life NC 1 230 FW 1 mg/L
Copper
Aquatic Life
NC
NO DATA
FW
NO DATA 2
ug/L
Fluoride
Aquatic Life
NC
1,800
FW
400
ug/L
Zinc I Aquatic,Life I NCI NO DATA I FW I NO DATA 10 ug/L•
NCO077992 9595 Final FW RPA w_upstream avg data column—diss to totalmetals_nodetects—lim!teddefaults 2016_822, input
1/27/2017

REASONABLE POTENTIAL ANALYSIS
Effluent Hardness
Date
Data BDL=1/2DL
Results
1
-Data
`" 251 25
Std Dev.
26.25
Std Dev. N/A
;
2
3
;
Mean
25.0000
4.
I
C.V.
0.0000
4f
!
10th Per value
n
1
5
'.
7
10th Per value
25.00 mg/L
6
' -
=, `'
Average Value
25.00 mg/L
7
Max. Value
25.00 mg/L
8'
9
12
10
13
14'`
15
12
16
13
17
a
14t
18
19
-'
16
'
21
17
22
18jj
23
S
19tF„,
24
1
20
-
26
21
27
'_
22
28
23
29�
24
32
3334
25
)
t
;
26
35�
27
3637
',
28-
38
29
i
391
'
31
41�'.
`.
32:
43�,'
33
.
34
-
;.
335
47f
48 j.
36
50
37
,
51,.
.,
38
•
52!
i
39
53
40
•
551.
4;,
.'
561
42f
57�
43
581
i.
4445
46
47 k..
49�`
”
50
..
51
52�,
534,
544.•
.,
.'
551
561.
571(
'
58 t:.
Upstream Hardness
Date
BDL=1/2DL
Results
1
-Data
`" 251 25
Std Dev.
2
;
Mean
3
;
j
C.V.
4.
I
n
5
', ;
!
10th Per value
6
;
Average Value
7
, -
Max. Value
8
I
9
10
12
13
14'`
15
16
t
17
a
18
19
-'
201
'
21
22
23
S
24
25
-
26
27
'_
;. l
28
29�
31{
32
3334
�
)
t
35�
3637
',
38
'.
391
'
41�'.
`.
421
43�,'
.
45'
461
;.
47f
48 j.
49t-
50
51,.
.,
52!
i
53
541
•
551.
561
57�
581
25.0000
0.0000
1
25.00 mg/L
25.00 mg/L
25.00 mg/L
NC0077992 9595 Final FW RPA w_upstream avg data column_diss to totalmetals_nodetects_limiteddefaults 2016_822, data
-1 - 1/27/2017

REASONABLE POTENTIAL ANALYSIS
Chlorides
Date Data BDL=1/2DL
1198
98.
Std Dev.
2
, 7/2/2012
,1941
194
3
8i6/2612--'
20&
205
411-;.9/4/2012
'°
,- 2011
201
5
_10/112012 -
215;215
4
6_
11/5/2012 ,
230;
230
7'
• 12/3/2012 '
2221
222
8
, -1/7/2013
270
270
9,'
'714/2013.,-
-223`•
223
10
3/4/2013 •
_192?
192
11
4/1/2013- `
1220'
220
12
,
5/6/2013
237,
237
13
6/3/2013 `
226;
226
14
7/1/2013
i, 226
220
15
8/4/2013
23T
237
16'
9/9%2613'
237;
237 .
17
10/112013
----1901
190
18.
-.
11/4/2013
,216
216
19
12/2/2013,,
210
210
20
-116/2014',
202
202
21
.. 2/3/2014
50'
50
22
3/3/2014;. •
--2081
208
23
.' 4/1/2014' �
- :9981
198
24
5/5/2014
2081
208
25,
6/412014.
2084
208
26
7/8/201.4-,
,186;
186
27
.8%5/2014
208c
208
28
9/2/2014:- . ;'
... 210,
210
29
-10/6/2014
202
202
30
•11119/2014
= 234't
234
31
12/112014
2071
207
32
, '1/512015
2010;
2070
33
-`212/2015
212;
212
34
- 3/2/2015
218'
218
35 [
9/1/2015 ,
217
217
36
:.5/4/2015
-'208i'
208
37
6/1/2015 '
204;
204
38 (
-7/1/2015,,j-,
_200;
200
391
" ; 8/3/2015 '
236;
236
401
9/1/2015
214,
214
41,
'.1011/2015
211;
211
421
11/2/2015 _
" -210,
210
43
_
' 12/1/2015 , ,
.206
205
44
.1/4/2016 -
204;
204
451
• 2/1 /2016
21S
213
46 r'
` 3/1/20-16 ,
233;
233
471
4/1/2016''_
218'.
218
48 i,
"5/2/2016
204;
204
49 %
6/6X2016 -;
; 210;
210
501
7/5/2016.
198,
198
51
.8/1/2016 - ,
208
208
52
9/6/2016
214
214
53,11
10/3/2016.
220`•
220
54 F."111/2/2016. -,--24§ 249
55
561,
571
581
Results
IN '$
Std Dev.
254.4501
Mean
245.2
C.V.
1.0378
n
54
Mult Factor =
1.0
Max. Value
2070.0 mg/L
Max. Pred Cw
2,132.1 mg/L
551
56'
57`
581,
Results
Copper
2.0585
Date Data
BDL=1/2DL
1-:15/4/20-12"'<
0.3833
; ;1011
5
2
-7/2/20.12 <..
101
5
3'8/6/2612
19.19 ug/L
4
—9/4/2012--'<'
'10'
5
5
2 :10/1/2012 <
10
5
6
.11%5%2012 , , :,
:11#
11
7
' 12/3/2012 <
1011
5
8
1/7/2013 <
1V
5
9
: ; 2/4/2013 <_
101
5
10
•', 3/4/2013 <
10?
5
11
, � 4/1/2013 ` <.
10)
5
12
' 5/6/2013 <
10)
5
13
6/3/2¢13 <
W
5
14
- 7/1/2013. <,
1011
5
15
$/5/2013 <,
1011
5
16
9/9/20.13 .< "
10,
5
17
,
' 1011/2013 - <
1011
5
18
11/4/2013 ' < .
10'
5
19
.1.21212013 <
101
5
20
116!2014 ' '<'
1 0�1
5
21
.= 2/312014 <
101
5
22.
:3/3/2014 <
101
5
23-
4/1/2014 <
10'
5
24
. " 5/5/2014 < ,
10(
5
25
6/4/201'4 t' <
10'
5
26
', 7/8/2014 <
4
5
27
,`.'815/2014..
•19i
19
28
9/2/2014 <
101
5
29
10/6/2014 z
'10
5
30
.'
:11/3/2014•' <:
-. 1011
5
31
12/1/2014 c
10
5
32
. 1/5/2015 ,,<
•10
5
33
, 2/2/2015 < .
'10;
5
34
- . 3/2/2015 <.
101
5
35
4/1/2015 <,-"
%
5
36
'514/2015 <
10
6
37
`6/1/2015 < -
it)
5
38
Y/1/2015 ' < ;" ',
10
5
39:.8/312015
<
10;
5
40
9/1/2015 . ,<
10
5
41
• 10%1/2015 , <
10;
5
42
, :11/2!2015 <
10:
5
43
12/1'/2015 , <,-
10
5
44
114/2016 <`. •
.10'
5
45
2/1/2016 , <.
, 10;
5
46
3/1/2016. <,
' 10,
5
47
4/1/2016 "e
'10'
5
48
-=512/2016. ' <'
101,
5
49
"6/6/2016 <.':
•10;
5
50
7/5/2016 <
10z
5
511
8/1/2016 " <
10
5
52 (
, 9/6/2016. <
10'
5
53'
.10/3/2016 2 ..10;
5
541/2/2016
<;`.'
t0i
5
551
56'
57`
581,
Results
Std Dev.
2.0585
Mean
5.3704
C.V.
0.3833
n
54
Mult Factor =
1.01
Max. Value
19.00 ug/L
Max. Pred Cw
19.19 ug/L
NCO077992 9595 Final FW RPA w upstream avg data column_diss to totalmetals_nodetects_limiteddefaults 2016_822, data
-2- 1/27/2017

6
7
8
9
10
11
12
16
17
18
19
20
21
22
23
24
25
28
29
30
31
32
33
34
35
36
38
39
40
41
42
43
44
45
46
47
481
49'.
501
51{
52,
5311
54.
55j
561,
571
58s
REASONABLE POTENTIAL ANALYSIS
Fluoride
Date Data
BDL=112DL
f 7/212012 •"
•1500;
1500
8/6/2012
1500,
1500
9/4/2012
1440
1440
f 10/1/2012
1600
1600
11/5/2012
1506"
1500
12%3/2012
1700;
1700
1/7/2013,•
-1600,
1600
2/4/2013
1500
1500
3/4/2013
1900'
1900
3/14/2013
1600,
1600
4/172013 _'
1700)
1700
5/6/2013
1800'
1800
6/3/2013
1840`,
1840
6/11/2013_
A700f
1700
7/1/2013
1800;
1800
8/5/2013 -
1600;
1600
9/9/2013
15001
1500
10/1/2013
1500;
1500
11/4/2013
2000
2000
11/18/2013
1600'
1600
12/2/2013
,1900;
1900
12/13/2013
1900'
1900
12/20/2013
1600"
1600
1/6/2014•
1700
1700
2/3/2014
1600
1600
3/3/2014
1700;
1700
4/1/2014
1600
1600
5/5/2014
1700±
1700
• 6/4/2014
1800
1800
7/8/2014
1800;
1800
8/5/2014 _
1700;
1700
9/2/2014
1700'
1700
10/6/2014
1700
1700
11/3/2014
1600'
1600
1 2/112 01 4 ''
1600,
1600
:1/5/2015
1700'
1700
2/2/2015
1700
1700
3/2/2015
1600;
1600
4/1/2015
1800.
1800
5/4/2015
1700
1700
6/1/2015
1700
1700
7/1/2015
1700;
1700
8/3/2015
1600'
1600
9/1/2015
1700;
1700
'10/1/2015
1600:
1600
11/2/2015
1500
1500
12/1/2015
1500
1500
1/4/2016
1500
1500
-2/1/2016 _
1500
1500
3/1/2016
1400;
1400
4/1/2016
1300.
1300
5/2/2016
1700'
1700
6/6/2016
1400,
1400
7/5/2016
1206'
1200
8/1/2016
1400,
1400
9/6/2016,
1200
1200
10/312016
1300
1300
11/2/2016
1600
1600
Results
Data
Std Dev.
166.3141
Mean
1616.8966
C.V.
0.1029
n
58
Mult Factor =
1.00
Max. Value
2000.0 ug/L
Max. Pred Cw
2000.0 ug/L
Par21
11
12
13
14
15
16
17
18
19
20
21
25
26
27
28
29
30
31
35
36
37
38
39
40
41
45
46
47
48
49
50
51
55
56
57
58
Zinc
Date
Data
BDL=112DL
6/4/2012
2
10;
5
7/2/2012
<
.10
5
8/6/2012:
Max. Value
11.,
11
9/4/2012
<
10.
5
10/1/2012
<
10
5
11/5/2012
<
10
5
12/3/2012
<
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Results
Std Dev.
16.8110
Mean
10.6481
C.V.
1.5788
n
54
Mult Factor =
1.04
Max. Value
122.0 ug/L
Max. Pred Cw
126.9 ug/L
NCO077992 9595 Final FW RPA w_upstream avg data column_diss to totalmetals nodetects_limiteddefaults 2016_822, data
-3- 1/27/2017