NC0083712_Fact Sheet_20230317

DEQ / DWR / NPDES
EXPEDITED FACT SHEET - NPDES PERMIT DEVELOPMENT
NPDES Permit NCO083712
Emily Richards, Compliance & Expedited Permitting Unit 31October2022
Facility Information
Applicant/Facility Name
Town of Mars Hill
Mars Hill Water Treatment Plant (WTP)
Applicant Address
P.O. Box 368, Mars Hill, NC 28754
Facility Address
2085 Water Shed Road, Mars Hill, NC 28754
Permitted Flow (MGD)
Not limited
Type of Waste
Water Plants and Water Conditioning Discharge — filter -backwash
— Conventional WTP System
Facility Class
PC-1
County
Madison
Permit Status
Renewal
Regional
Office
ARO
Stream Characteristics
Receiving Stream
North Fork Big
Laurel Creek
Stream Classification
C; ORW
Stream Segment
[6-112-1-(2)]
Drainage basin
French Broad
Summer 7Q10 (cfs)
1.2
Subbasin
[HUC]
04-03-04
[060101051001 ]
Winter 7Q10 (cfs)
1.7
Use Support
Not listed in 2022
303d
30Q2 (cfs)
2.6
303(d) Listed
Average Flow (cfs)
5.08
State Grid
D9NW
IWC (%)
13.3%
USGS Topo Quad
Bald Creek, NC
FACILITY SUMMARY: This facility is a conventional technology water treatment plant [coagulation,
flocculation, sedimentation, and filtration] with discharge of wastewaters from media filter backwash and
sedimentation basins with a design potable flowrate of 0.80 MGD, a backwash or reject flow of 0.0183
MGD and a current maximum monthly average wastewater discharge of 0.025 MGD. The facility consists
of the following water and wastewater treatment units:
• coagulation
• flocculation
• sedimentation
• filtration
• chlorination
• dechlorination
• wastewater treatment settling lagoon
• chemicals - Potable Water Treatment
■ alum / aluminum sulfate [primary coagulant]
■ zinc -orthophosphate [corrosion inhibiter]
■ hypochlorite solution [disinfection]
■ chloramines [secondary disinfection]
■ caustic [pH adjustment]
■ super flock polymer [coagulation, flocculation]
■ calcium thiosulfate [dechlorination].
Fact Sheet
Renewal 2017 — NPDES Permit NCO083712
Page 1

RENEWAL SUMMARY: This permit reflects discharge at Outfall 001. DWR updated the following:
1. Electronic reporting of discharge monitoring reports (eDMR) in Section A. (4.) has been updated to
be consistent with current federal requirements.
ELIGIBILITY FOR COVERAGE UNDER THE GENERAL PERMIT NCG590000: The Town of
Mars Hill is not eligible for the general permit because North Fork Big Laurel Creek [stream segment 6-
112-1-(2)] currently discharges to waters classified C; ORW. Discharges from WTPs to Outstanding
Resource Waters (ORW) and high quality water (HQW) are excluded from general permit NCG590000.
TOXICITY: With an IWC > 0.25%, this permit requires Chronic Whole Effluent Toxicity (WET) testing
using Ceriodaphnia dubia to be performed as a 7-day pass/fail test at 3.3% effluent concentration, once per
quarter [TGP3B] [See Condition A. (2.).]. Review of Whole Effluent Toxicity (WET) testing data from
January 2018 to Dec 2022 found at overall pass rate of 100% (11 test results) [see attached Whole Effluent
Toxicity Testing and Self -Monitoring Summary].
COMPLIANCE HISTORY: One violation in 2018 for monitoring frequency violation. No
enforcements.
STREAM: The stream at the point of discharge is identified as North Fork Big Laurel Creek with stream
index 6-112-1-(2) and currently classified C; ORW
DATA SUMMARY
Maximum Monthly Average Flow for Sept 2019-August 2022 (3 years): 0.025 MGD
DMR Daily Parameter Values for March 2018-August 2022 (4.5 years)
Parameter
00010 - Temperature, Water Deg. Centigrade
00070 - Turbidity
00400 - pH
00900 - Hardness, Total (as CaCO3)
01092 - Zinc, Total (as Zn)
01105 - Aluminum, Total (as Al)
50050 - Flow, in conduit or thru treatment plant
50060 - Chlorine, Total Residual
C0530 - Solids, Total Suspended - Concentration
C0610 - Nitrogen, Ammonia Total (as N) - Concentration
TGP313 - Pass/Fail Static Renewal 7Day Chronic
Ceriodaphnia
verage
Min
Max
n
13.67
1.8
23.2
233
4.32
1.2
11.6
108
6.84
6.3
7.4
235
12.58
4.1
94
18
1.14
0.01
20
18
112.13
0.48
2000
18
0.02
0.003
0.0668
235
21.86
0
28
114
10.45
3.2
25.2
108
0.10
0.1
0.1
18
RPA: The need for toxicant limits is based upon a demonstration of reasonable potential to exceed water
quality standards, a statistical evaluation that is conducted during every permit renewal utilizing the most
recent effluent data for each outfall. The RPA is conducted in accordance with 40 CFR 122.44 (d) (i). The
NC RPA procedure utilizes the following: 1) 95% Confidence Level/95% Probability; 2) assumption of
zero background; 3) use of % detection limit for "less than" values; and 4) streamflows used for dilution
consideration based on 15A NCAC 2B.0206. Effective April 6, 2016, NC began implementation of
dissolved metals criteria in the RPA process in accordance with guidance titled NPDES Implementation of
Instream Dissolved Metals Standards, dated June 10, 2016.
Fact Sheet
Renewal 2022 - NPDES Pennit NCO083712
Page 2

A reasonable potential analysis was conducted on effluent toxicant data collected between March 2018-
August 2022. Pollutants of concern included toxicants with positive detections and associated water quality
standards/criteria. Based on this analysis, the following permitting actions are proposed for this permit:
• Monitoring Only. The following parameters will continue to receive a monitor -only requirement
since they did not demonstrate reasonable potential to exceed applicable water quality
standards/criteria, but a chemical with this metal is in use at the water treatment plant: Zinc
NPDES Implementation of Instream Dissolved Metals Standards — Freshwater Standards
The NC 2007-2015 Water Quality Standard (WQS) Triennial Review was approved by the NC
Environmental Management Commission (EMC) on November 13, 2014. The US EPA subsequently
approved the WQS revisions on April 6, 2016, with some exceptions. Therefore, metal limits in draft
permits out to public notice after April 6, 2016 must be calculated to protect the new standards - as
approved.
Table 1. NC Dissolved Metals Water Quality Standards/Aquatic Life Protection
Parameter
Acute FW, µg/I
(Dissolved)
Chronic FW, µg/I
(Dissolved)
Acute SW, µg/I
(Dissolved)
Chronic SW, µg/I
(Dissolved)
Arsenic
340
150
69
36
Beryllium
65
6.5
---
Cadmium
Calculation
Calculation
40
8.8
Chromium III
Calculation
Calculation
---
---
Chromium VI
16
11
1100
50
Copper
Calculation
Calculation
4.8
3.1
Lead
Calculation
Calculation
210
8.1
Nickel
Calculation
Calculation
74
8.2
Silver
Calculation
0.06
1.9
0.1
Zinc
Calculation
Calculation
90
81
Table 1 Notes:
1. FW= Freshwater, SW= Saltwater
2. Palcu= = Hardness dependent standard
3. Only the aquatic life standards listed above are expressed in dissolved form. Aquatic life standards
for Mercury and selenium are still expressed as Total Recoverable Metals due to bioaccumulative
concerns (as are all human health standards for all metals). It is still necessary to evaluate total
recoverable aquatic life and human health standards listed in 15A NCAC 2B.0200 (e.g., arsenic at
10 µg/1 for human health protection; cyanide at 5 µg/L and fluoride at 1.8 mg/L for aquatic life
protection).
Fact Sheet
Renewal 2022 — NPDES Pennit NC0083712
Page 3

Table 2. Dissolved Freshwater Standards for Hardness -Dependent Metals
The Water Effects Ratio (WER) is equal to one unless determined otherwise under 15A
NCAC 02B .0211 Subparagraph (11)(d)
Metal
NC Dissolved Standard, µg/I
Cadmium, Acute
WER*{1.136672-[In hardness] (0.041838)} • e^{0.9151 [ln hardness]-3.1485}
Cadmium, Acute Trout waters
WER*{1.136672-[In hardness] (0.041838)} • e^{0.9151[ln hardness] -3.6236}
Cadmium, Chronic
WER*{1.101672-[In hardness] (0.041838)} • e^{0.7998[ln hardness]-4.4451}
Chromium III, Acute
WER*0.316 e^{0.8190[ln hardness]+3.7256}
Chromium III, Chronic
WER*0.860 e^{0.8190[ln hardness]+0.6848}
Copper, Acute
WER*0.960 e^{0.9422[ln hardness] -1.700}
Copper, Chronic
WER*0.960 e^{0.8545[ln hardness]-1.702}
Lead, Acute
WER*{1.46203-[ln hardness](0.145712)} • e^{1.273[ln hardness] -1.460}
Lead, Chronic
WER*{1.46203-[ln hardness](0.145712)} • e^{1.273[ln hardness]-4.705}
Nickel, Acute
WER*0.998 e^{0.8460[ln hardness]+2.255}
Nickel, Chronic
WER*0.997 eA{0.8460[ln hardness]+0.0584}
Silver, Acute
WER*0.85 • eA{1.72[ln hardness]-6.59}
Silver, Chronic
Not applicable
Zinc, Acute
WER*0.978 eA{0.8473[ln hardness]+0.884}
Zinc, Chronic
WER*0.986 eA{0.8473[ln hardness]+0.884}
General Information on the Reasonable Potential Analysis (RPA)
The RPA process itself did not change as the result of the new metals standards. However, application of
the dissolved and hardness -dependent standards requires additional consideration in order to establish the
numeric standard for each metal of concern of each individual discharge.
The hardness -based standards require some knowledge of the effluent and instream (upstream) hardness and
so must be calculated case -by -case for each discharge.
Metals limits must be expressed as `total recoverable' metals in accordance with 40 CFR 122.45(c). The
discharge -specific standards must be converted to the equivalent total values for use in the RPA
calculations. We will generally rely on default translator values developed for each metal (more on that
below), but it is also possible to consider case -specific translators developed in accordance with established
methodology.
RPA Permitting Guidance/WQBELs for Hardness -Dependent Metals - Freshwater
The RPA is designed to predict the maximum likely effluent concentrations for each metal of concern,
based on recent effluent data, and calculate the allowable effluent concentrations, based on applicable
standards and the critical low -flow values for the receiving stream.
If the maximum predicted value is greater than the maximum allowed value (chronic or acute), the
discharge has reasonable potential to exceed the standard, which warrants a permit limit in most cases. If
monitoring for a particular pollutant indicates that the pollutant is not present (i.e. consistently below
detection level), then the Division may remove the monitoring requirement in the reissued permit.
Fact Sheet
Renewal 2022 - NPDES Pennit NCO083712
Page 4

To perform a RPA on the Freshwater hardness -dependent metals the Permit Writer compiles the
following information:
• Critical low flow of the receiving stream, 7Q 10 (the spreadsheet automatically calculates
the 1 Q 10 using the formula 1 Q 10 = 0.843 (s7Q 10, cfs) 0.993
• Effluent hardness and upstream hardness, site -specific data is preferred
• Permitted flow
• Receiving stream classification
2. In order to establish the numeric standard for each hardness -dependent metal of concern and for
each individual discharge, the Permit Writer must first determine what effluent and instream
(upstream) hardness values to use in the equations.
The permit writer reviews DMR's, Effluent Pollutant Scans, and Toxicity Test results for any
hardness data and contacts the Permittee to see if any additional data is available for instream
hardness values, upstream of the discharge.
If no hardness data is available, the permit writer may choose to do an initial evaluation using a
default hardness of 25 mg/L (CaCO3 or (Ca + Mg)). Minimum and maximum limits on the
hardness value used for water quality calculations are 25 mg/L and 400 mg/L, respectively.
If the use of a default hardness value results in a hardness -dependent metal showing reasonable
potential, the permit writer contacts the Permittee and requests 5 site -specific effluent and upstream
hardness samples over a period of one week. The RPA is rerun using the new data.
The overall hardness value used in the water quality calculations is calculated as follows:
Combined Hardness (chronic)
_ (Permitted Flow, cfs *Avg. Effluent Hardness, mg/L) + (s7Q10, cfs *Avg. Upstream Hardness, mg/L)
(Permitted Flow, cfs + s7Q10, cfs)
The Combined Hardness for acute is the same but the calculation uses the IQ 10 flow.
3. The permit writer converts the numeric standard for each metal of concern to a total recoverable
metal, using the EPA Default Partition Coefficients (DPCs) or site -specific translators, if any have
been developed using federally approved methodology.
EPA default partition coefficients or the "Fraction Dissolved" converts the value for
dissolved metal at laboratory conditions to total recoverable metal at in -stream ambient
conditions. This factor is calculated using the linear partition coefficients found in The
Metals Translator: Guidance for Calculating a Total Recoverable Permit Limit from a
Dissolved Criterion (EPA 823-B-96-007, June 1996) and the equation:
Cdiss - 1
Ctotal 1 + { [Kpo] [SS(I+a)] [10-1] }
Where:
ss = in -stream suspended solids concentration [mg/1], minimum of 10 mg/L used, and
Kpo and a = constants that express the equilibrium relationship between dissolved and
adsorbed forms of metals. A list of constants used for each hardness -dependent metal can
also be found in the RPA program under a sheet labeled DPCs.
Page 5

4. The numeric standard for each metal of concern is divided by the default partition coefficient (or
site -specific translator) to obtain a Total Recoverable Metal at ambient conditions.
In some cases, where an EPA default partition coefficient translator does not exist (ie. silver), the
dissolved numeric standard for each metal of concern is divided by the EPA conversion factor to
obtain a Total Recoverable Metal at ambient conditions. This method presumes that the metal is
dissolved to the same extent as it was during EPA's criteria development for metals. For more
information on conversion factors see the June, 1996 EPA Translator Guidance Document.
5. The RPA spreadsheet uses a mass balance equation to determine the total allowable concentration
(permit limits) for each pollutant using the following equation:
Ca = (s7Q 10 + Qw) (Cwgs)^(s7Q 10) (Cb)
Qw
Where: Ca = allowable effluent concentration (µg/L or mg/L)
Cwqs = NC Water Quality Standard or federal criteria (µg/L or mg/L)
Cb = background concentration: assume zero for all toxicants except NH3* (µg/L or mg/L)
Qw = permitted effluent flow (cfs, match s7Q 10)
s7Q 10 = summer low flow used to protect aquatic life from chronic toxicity and human health
through the consumption of water, fish, and shellfish from noncarcinogens (cfs)
* Discussions are on -going with EPA on how best to address background concentrations
Flows other than s7Q 10 may be incorporated as applicable:
IQ 10 = used in the equation to protect aquatic life from acute toxicity
QA = used in the equation to protect human health through the consumption of water, fish,
and shellfish from carcinogens
30Q2 = used in the equation to protect aesthetic quality
6. The permit writer enters the most recent 2-3 years of effluent data for each pollutant of concern.
Data entered must have been taken within four and one-half years prior to the date of the permit
application (40 CFR 122.21). The RPA spreadsheet estimates the 95th percentile upper
concentration of each pollutant. The Predicted Max concentrations are compared to the Total
allowable concentrations to determine if a permit limit is necessary. If the predicted max exceeds
the acute or chronic Total allowable concentrations, the discharge is considered to show reasonable
potential to violate the water quality standard, and a permit limit (Total allowable concentration) is
included in the permit in accordance with the U.S. EPA Technical Support Document for Water
Quality -Based Toxics Control published in 1991.
7. When appropriate, permit writers develop facility specific compliance schedules in accordance with
the EPA Headquarters Memo dated May 10, 2007 from James Hanlon to Alexis Strauss on 40 CFR
122.47 Compliance Schedule Requirements.
The Total Chromium NC WQS was removed and replaced with trivalent chromium and hexavalent
chromium Water Quality Standards. As a cost savings measure, total chromium data results may be
used as a conservative surrogate in cases where there are no analytical results based on chromium
Fact Sheet
Renewal 2022 — NPDES Pennit NCO083712
Page 6

III or VI. In these cases, the projected maximum concentration (95th %) for total chromium will be
compared against water quality standards for chromium III and chromium VI.
9. Effluent hardness sampling and instream hardness sampling, upstream of the discharge, are inserted
into all permits with facilities monitoring for hardness -dependent metals to ensure the accuracy of
the permit limits and to build a more robust hardness dataset.
10. Hardness and flow values used in the Reasonable Potential Analysis for this permit included:
Parameter
Value
Comments (Data Source)
Average Effluent Hardness (mg/L)
[Total as, CaCO3 or (Ca+Mg)]
25
default hardness
Average Upstream Hardness (mg/L)
[Total as, CaCO3 or (Ca+Mg)]
25
default hardness
7Q 10 summer (cfs)
1.2
Permit File/ BIMS
1Q10 (cfs)
1.01
By Calculation in RPA
Maximum Monthly Average (MGD)
0.026
Jan20l4-Dec2016 DMR Data
Fact Sheet
Renewal 2022 — NPDES Pennit NC0083712
Page 7

Whole Effluent Toxicity Testing and Self Monitoring Summary
Marion-Corpening Cr. WWTP
NCO031879/001
County: McDowell
Ceri7dPF
Begin:
5/1/2021
chr lim: 63%
@ ISM
NonComp:
Single
J
F
M
A
M
2018
-
Pass
-
-
Pass
2019
-
Pass
-
-
Pass
2020
-
Pass
-
-
Pass
2021
-
Pass
-
-
Pass
2022
-
Pass
-
-
Pass
Mars Hill WTP
NCO083712/001
County: Madison
Ceri7dPF
Begin:
7/1/2011
Chr Monit:
5.78%
NonComp:
J
F
M
A
M
2018
Pass
-
-
Pass
-
2019
Pass
-
-
Pass
-
2020
Pass
-
-
Pass
-
2021
Pass
-
-
Pass
-
2022
Pass
-
-
Pass
-
Marshall WWTP
NCO021733/001
County: Madison
Fthd24PF
Begin:
7/1/2022
24hr p/f ac
lim: 90%
+ NonComp:
Single
J
F
M
A
M
2018
-
Pass
-
-
Pass
2019
-
Pass
-
-
Pass
2020
-
Pass
-
-
Pass
2021
-
Pass
-
-
Pass >100(P)
2022
-
Pass
-
-
Pass
Martin County WTP
NCO089435/001
County: Martin
Ceri7dPF
Begin:
4/1/2014
Chr Monit:
90%
NonComp:
J
F
M
A
M
2018
-
-
Pass
-
-
2019
-
-
Pass
-
-
2020
-
-
Pass
-
-
2021
-
-
Pass
-
-
2022
H
Maxton WTP
NCO048577/001
County: Robeson
Ceri7dPF
Begin:
9/1/2014
Chr Monit:
90%
NonComp:
J
F
M
A
M
2018
Pass
-
-
Fail
-
2019
Fail
-
-
Fail
-
2020
Fail
-
-
Pass
-
2021
Pass
-
-
Pass
-
2022
Pass
-
-
Fail
-
Region: ARO
Basin: CTB30
Feb May Aug Nov
7Q10: 2.3
PF: 3.0 IWC:
67 Freq: Q
J
J
A
S
O
Pass
-
-
-
-
>100(P) Pass
>100 (P)
>100(P)
Pass
-
Pass
Pass
-
Region: ARO
Basin: FRB04
Jan Apr Jul Oct
7Q10:
PF: IWC:
Freq: Q
J
J
A
S
O
-
Pass
-
-
Pass
-
Pass
-
-
Pass
-
Pass
-
-
Pass
-
Pass
-
-
Pass
Pass
SOC JOC:
N
Pass
>100 (P) Pass
Pass
Pass
Pass
C
SOC
JOC:
N D
Region:
ARO
Basin: FRB04
Feb May Aug Nov
SOC JOC:
70.10: 535
PF: 0.40 IWC: 0.12
Freq: Q
I
J
A
S
O
N
-
-
Pass
-
-
Pass
-
-
Pass
-
-
Pass
-
-
Pass
-
-
Pass
>100(P)
>100(P)
Pass >100(P)
-
-
Pass
-
-
Pass
-
Region:
WARO
Basin: ROA09
Mar Jun Sep Dec
SOC JOC:
7Q10:
PF: IWC:
Freq: Q
J
J
A
S
O
N
Pass
-
-
Pass
-
-
Pass
-
-
Pass
-
-
Pass
-
-
Pass
-
-
Pass
H
H
H
Region:
FRO
Basin: LUM51
Jan Apr Jul Oct
SOC JOC:
70.10:
PF: IWC:
Freq: Q
J
J
A
S
O
N
-
Fail
-
-
Fail
-
-
NIR
-
-
Pass
-
-
Pass
-
-
Pass
-
-
Pass
-
-
Pass
-
-
Pass
-
-
Fail
-
G
D
Pass
Pass
Pass
H
r
Leeend: P= Fathead minnow (Pimohales oromelas). H=No Flow (facilitv is active). s = Snlit test between Certified Labs Page 70 of 118

Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
MAXIMUM DATA POINTS = 58
Table 1. Project Information
❑ CHECK IF HQW OR ORW WQS
Facility Name
WWTP/WTP Class
NPDES Permit
Outfal l
Flow, Qw (MGD)
Receiving Stream
HUC Number
Stream Class
Mars Hill WTP
Grade I Physical Chemical
NCO083712
001
0.025
Dan River
060101051001
C;ORW
❑ Apply WS Hardness WQC
7Q1Os (cfs)
7011Ow (cfs)
30Q2 (cfs)
QA (cfs)
1 Q10s (cfs)
1.20
1.70
1.01
Effluent Hardness
Upstream Hardness
------------
Combined Hardness Chronic
Combined Hardness Acute
12.58 mg/L (Avg)
25 mg/L (Avg)
------------------
25 mg/L
25 m /L
Data Source(s)
❑ CHECK TO APPLY MODEL
REQUIRED DATA ENTRY
Par01
Par02
Par03
Par04
Par05
Par06111111
Par07
Par08
Par09
Par10
Par11
Par12
Par13
Par14
Par15
Par16
Par17
Par18
Par19
Par20
Par21
Par22
Par23
Par24
Table 2. Parameters of Concern
Name WQs Type Chronic Modifier Acute PQL Units
Arsenic
Aquactic Life
C
150
FW
340
ug/L
Arsenic
Human Health
Water Supply
C
10
HH/WS
N/A
ug/L
Beryllium
Aquatic Life
NC
6.5
FW
65
ug/L
Cadmium
Aquatic Life
NC
0.5899
FW
3.2396
ug/L
Chlorides
Aquatic Life
NC
230
FW
Chlorinated Phenolic Compounds
Water supply
NC
1
A
ug/L
Total Phenolic Compounds
Aquatic Life
NC
300
A
ug/L
Chromium III
Aquatic Life
NC
117.7325
FW
905.0818
ug/L
Chromium VI
Aquatic Life
NC
11
FW
16
pg/L
Chromium, Total
Aquatic Life
NC
N/A
FW
N/A
pg/L
Copper
Aquatic Life
NC
7.8806
FW
10.4720
ug/L
Cyanide
Aquatic Life
NC
5
FW
22
10
ug/L
Fluoride
Aquatic Life
NC
1,800
FW
ug/L
Lead
Aquatic Life
NC
2.9416
FW
75.4871
ug/L
Mercury
Aquatic Life
NC
12
FW
0.5
ng/L
Molybdenum
Human Health
NC
2000
HH
ug/L
Nickel
Aquatic Life
NC
37.2313
FW
335.2087
pg/L
Nickel
Water Supply
NC
25.0000
WS
N/A
pg/L
Selenium
Aquatic Life
NC
5
FW
56
ug/L
Silver
Aquatic Life
NC
0.06
FW
0.2964
ug/L
Zinc
Aquatic Life
NC
126.7335
FW
125.7052
ug/L
NCO083712 Final FW RPA 2022, input
1 /9/2023

H1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
REASONABLE POTENTIAL ANALYSIS
H2
Use "PASTE SPECIAL
Effluent Hardness Values" then "COPY" Upstream Hardness
. Maximum data
points = 58
Use "PASTE SPECIAL
Values" then "COPY"
. Maximum data
points = 58
Date
Data
BDL=1/2DL
Results
Date
Data BDL=1/2DL Results
4/10/2018
4.1
4.1
Std Dev.
20.5759
1
25 25 Std Dev. N/A
7/17/2018
5
5
Mean
12.5778
2
Mean
25.0000
10/11/2018
6
6
C.V.
1.6359
3
C.V.
0.0000
1/15/2019
8
8
n
18
4
n
1
4/2/2019
94
94
10th Per value
5.00 mg/L
5
10th Per value
25.00 mg/L
7/11/2019
5
5
Average Value
12.58 mg/L
6
Average Value
25.00 mg/L
10/1/2019
10
10
Max. Value
94.00 mg/L
7
Max. Value
25.00 mg/L
1 /7/2020
10
10
8
4/7/2020
8.1
8.1
9
7/7/2020
6.1
6.1
10
10/6/2020
10
10
11
1/12/2021
5
5
12
4/13/2021
8
8
13
7/20/2021
6
6
14
10/12/2021
14
14
15
1 /11 /2022
16
16
16
4/12/2022
5
5
17
7/12/2022
6.1
6.1
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
NCO083712 Final FW RPA 2022, data
-3- 1 /9/2023

REASONABLE POTENTIAL ANALYSIS
Par21
Use "PASTE SPECIAL
Zinc.
Values" then "COPY"
. Maximum data
points = 58
Date
Data
BDL=112DL
Results
1
4/10/2018
20
20
Std Dev.
55.1940
2
7/17/2018
11
11
Mean
31.5000
3
10/11/2018
11
11
C.V.
1.7522
4
1/15/2019
21
21
n
18
5
4/2/2019
11
11
6
7/11/2019
15
15
Mult Factor =
2.09
7
10/1/2019
12
12
Max. Value
251.0 ug/L
8
1/7/2020
23
23
Max. Fred Cw
524.6 ug/L
9
4/7/2020
21
21
10
7/7/2020
17
17
11
10/6/2020
251
251
12
1/12/2021
36
36
13
4/13/2021
19
19
14
7/20/2021
10
10
15
10/12/2021
20
20
16
1/11/2022
29
29
17
4/12/2022
23
23
18
7/12/2022
17
17
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
NCO083712 Final FW RPA 2022, data
- 4 - 1 /9/2023

Mars Hill WTP
NCO083712
Outfall 001
Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators Qw = 0.025 MGD
MAXIMUM DATA POINTS = 58 YOU HAVE DESIGNATED THIS RECEIVING
STREAM ASH W OR ORW
Qw (MGD) =
0.0250
1Q10S(cfs)=
1.01
7QIOS(cfs)=
1.20
7Q10W (cfs) =
1.70
30Q2 (cfs) =
NO 3002 DATA
Avg. Stream Flow, QA (cfs) =
NO QA DATA
Receiving Stream: Dan River HUC 060101051001
Q
WWTP/WTP Class: Grade I Physical Chemical COMBINED HARDNESS (mE/L
IWC% @ 1Q10S =
3.694874851 Acute =25 mg/L
IWC% @ 7Q l OS =
3.12815338 Chronic = 25 mg/L
IWC% 9 7Q10W =
2.228612509
IWC% @ 30Q2 =
N/A
IW%C @ QA =
N/A
Stream Class:
C;ORW
Page 5 of 5
NCO083712 Final FW RPA 2022, rpa
1 /9/2023

3/2/23, 3:41 PM https://www.ncnotices.com/(S(railu4tc4ahlgsoz3f2rd3ll))/DetailsPrint.aspx?SID=rai1 u4tc4ahlgsoz3f2rd3ll&ID=334819
ipt>
News -Record & Sentinel, The
Publication Name:
News -Record & Sentinel, The
Publication URL:
Publication City and State:
Marshall, NC
Publication County:
Madison
Notice Popular Keyword Category:
Notice Keywords:
NCO083712
Notice Authentication Number:
202303021441321496734
2510867466
Notice URL:
Back
Notice Publish Date:
Wednesday, January 18, 2023
Notice Content
Public Notice North Carolina Environmental Management Commission/NPDES Unit 1617 Mail Service Center Raleigh, NC 27699-1617 Notice
of Intent to Issue a NPDES Wastewater Permit NCO083712 Mars Hill WTP The North Carolina Environmental Management Commission
proposes to issue a NPDES wastewater discharge permit to the person(s) listed below. Written comments regarding the proposed permit will
be accepted until 30 days after the publish date of this notice. The Director of the NC Division of Water Resources (DWR) may hold a public
hearing should there be a significant degree of public interest. Please mail comments and/or information requests to DWR at the above
address. Interested persons may visit the DWR at 512 N. Salisbury Street, Raleigh, NC 27604 to review the information on file. Additional
information on NPDES permits and this notice may be found on our website: http://deq.nc.gov/about/divisions/water-resources/water-
resources-permits/wastewater-branch/npdes-wastewater/public-notices,or by calling [phone]. NPDES Permit NCO083712: Town of
Mars Hill applied to renew its permit for the Mars Hill WTP in Madison County, discharging filter -backwash wastewater to North Fork Big
Laurel Creek, French Broad River Basin. Currently Turbidity, Total Suspend Solids (TSS) and Total Residual Chloride (TRC) are water -quality
limited. This discharge may affect future wasteload allocations in this portion of North Fork Big Laurel Creek. January 18, 2023 0005555519
Back
https://www.ncnotices.com/(S(rail u4tc4ahlgsoz3f2rd3il ))/DetailsPrint.aspx?SID=rai 1 u4tc4ahlgsoz3f2rd3ll &ID=334819 1/1

ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
S. DANIEL SMITH
Director
Town of Mark Hill
Attn: Jason Riddle, Public Works Supt.
PO Box 368
Mars Hill, NC 28754-0368
Subject: Permit Renewal
Application No. NCO083712
Mars Hill WTP
Madison County
Dear Applicant:
tee. STATE
7
•<� 9uu.,,,rd�
NORTH CAROLINA
Environmental Quality
March 04, 2022
The Water Quality Permitting Section acknowledges the March 4, 2022 receipt of your permit renewal application and
supporting documentation. Your application will be assigned to a permit writer within the Section's NPDES WW permitting
branch. Per G.S. 150B-3 your current permit does not expire until permit decision on the application is made.
Continuation of the current permit is contingent on timely and sufficient application for renewal of the current permit. The
permit writer will contact you if additional information is required to complete your permit renewal. Please respond in a
timely manner to requests for additional information necessary to allow a complete review of the application and renewal
of the permit.
Information regarding the status of your renewal application can be found online using the Department of Environmental
Quality's Environmental Application Tracker at:
https://deg. nc.gov/permits-regulations/permit-guidance/environmental-application-tracker
If you have any additional questions about the permit, please contact the primary reviewer of the application using the
links available within the Application Tracker.
ec: WQPS Laserfiche File w/application
IcJere) 1
Wren Thedford
Administrative Assistant
Water Quality Permitting Section
North Carolina Department of Environmental Quality I Division of Water Resources
Asheville Regional Office 2090 U.S. Highway 70 1 Swannanoa. North Carolina 28778
*+ Ns /"e 828.296.4500

NPDES Permit NCO083712
Town of Mars Hill RECEIVED
Madison County MAR 04 2p22
NCDEQIDWRINPDES
The Town of Mars Hill would like to request the renewal of its water treatment plant
lagoon permit (NPDES Permit NC0083712). There have been no changes in treatment
process or Lagoon design from the last permit. Our facility has a good record of
compliance and is operating properly. If you have any questions, feel free to call me at
[phone].
Town of Mars Hill
Public Works Superintendent - ORC
Jason Riddle 02/28/2022

EPA Identification Number
NPDES Permit Number
Facility Name
Form Approved 03/05/19
NCO083712
Town of Mars Hill
OMB No.2040-0004
Form
U.S. Environmental Protection Agency
t
='EPA
Application for NPDES Permit to Discharge Wastewater
NPDES
GENERAL INFORMATION
SECTION•NPDES
Applicants Not Required to Submit Form 1
1.1
1.1.1
Is the facility a new or existing publicly owned
1.1.2
Is the facility a new or existing treatment works
treatment works?
treating domestic sewage?
If yes, STOP. Do NOT complete 0 No
If yes, STOP. Do NOT No
Form 1. Complete Form 2A.
complete Form 1. Complete
Form 2S.
1.2
Applicants Required to Submit Form 1
If
1.2.1
Is the facility a concentrated animal feeding
1.2.2
Is the facility an existing manufacturing,
E
operation or a concentrated aquatic animal
commercial, mining, or silvicultural facility that is
a
production facility?
currently discharging process wastewater?
oYes
4 Complete Form 1 No
Yes 4 Complete Form 0 No
a
and Form 26.
1 and Form 2C.
z
1.2.3
Is the facility a new manufacturing, commercial,
1.2.4
Is the facility a new or existing manufacturing,
mining, or silvicultural facility that has not yet
commercial, mining, or silvicultural facility that
—
commenced to discharge?
discharges only nonprocess wastewater?
❑ Yes 4 Complete Form 1 �✓ No
❑ Yes 4 Complete Form No
and Form 2D.
1 and Form 2E.
Cn
r
1.2.5
Is the facility a new or existing facility whose
'—
discharge is composed entirely of stormwater
a
associated with industrial activity or whose
discharge is composed of both stormwater and
non-stormwater?
Yes 4 Complete Form 1 �✓ No
and Form 2F
unless exempted by
40 CFR
122.26(b)(14)(x) or
b 15 .
SECTIOND••
AND LOCATION (40
Facility Name
2.1
Town of Mars Hill Water Treatment Plant (WTP)
0
2.2
EPA Identification Number
V
0
J
v
2.3
Facility Contact
Name (first and last)
Title
Phone number
Jason Riddle
Public works superintendent
[phone]
Q
=
Email address
:R
[e-mail]
2.4
Facility Mailing Address
zStreet
or P.O. box
P.O. Box 368
City or town
State
ZIP code
Mars Hill
NC
28754
EPA Form 3510-1 (revised 3-19)
Page 1

EPA Identification Number
NPDES Permit Number
Facility Name
Form Approved 03/05/19
NCO083712
Town of Mars Hill
OMB No.2040-0004
v;
2.5
Facility Location
2
Street, route number, or other specific identifier
Q 0
U
2085 Water Shed Road
tM
c
County name
County code (if known)
Madison
E _j
City or town
State ZIP code
z
IMars Hill
NC 28754
SECTION••
I
SIC Code(s)
Description (optional)
3.1
N
d
0
U
N
U
z
-a
3.2
NAICS Code(s)
Description (optional)
_
R
U
N
Name of Operator
4.1
Town of Mars Hill
0
4.2
Is the name you listed in Item 4.1 also the owner?
El Yes ElNo
0
7
4.3
Operator Status
0
❑ Public —federal r❑ Public —state ❑ Other public (specify)
o
ElPrivate ElOther (specify)
4.4
Phone Number of Operator
[phone]
=
4.5
Operator Address
w
Street or P.O. Box
R
E
PO 368
w
City or town
State
ZIP code
0 0
Mars Hill
NC
28754
R U
o
Email address of operator
O
[e-mail]
SECTION1
I 1
Is the facility located on Indian Land?
R -a
5.1
- _
J
❑ Yes 0 No
EPA Form 3510-1 (revised 3-19) Page 2

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NCO083712 Town of Mars Hill OMB No.2040-0004
6.1 Existing Environmental Permits (check all that apply and print or type the corresponding permit number for each)
d ❑✓ NPDES (discharges to surface ❑ RCRA (hazardous wastes) ❑ UIC (underground injection of
a water) fluids)
o
w d ❑ PSD (air emissions) ❑ Nonattainment program (CAA) ❑ NESHAPs (CAA)
�a
c
w ❑ Ocean dumping (MPRSA) ❑ Dredge or fill (CWA Section 404) ❑ Other (specify)
7.1 Have you attached a topographic map containing all required information to this application? (See instructions for
specific requirements.)
❑✓ Yes ❑ No ❑ CAFO—Not Applicable (See requirements in Form 213.)
8.1 Describe the nature of your business.
To treat and discharge WTP backwash and flush water in the lagoon.
Cn
CA
am
in
3
m
0
O
N
7
i4
Z
9.1 Does your facility use cooling water?
❑ Yes 0 No -> SKIP to Item 10.1.
a 9.2 Identify the source of cooling water. (Note that facilities that use a cooling water intake structure as described at
�a, w 40 CFR 125, Subparts I and J may have additional application requirements at 40 CFR 122.21(r). Consult with your
C NPDES permitting authority to determine what specific information needs to be submitted and when.)
o a'
O Y
U
10.1 1 Do you intend to request or renew one or more of the variances authorized at 40 CFR 122.21(m)? (Check all that
N apply. Consult with your NPDES permitting authority to determine what information needs to be submitted and
when.)
❑ Fundamentally different factors (CWA ❑ Water quality related effluent limitations (CWA Section
Section 301(n)) 302(b)(2))
❑ Non -conventional pollutants (CWA ❑ Thermal discharges (CWA Section 316(a))
Section 301(c) and (g))
0 Not applicable
EPA Form 3510-1 (revised 3-19)
Page 3

EPA Identification Number
NPDES Permit Number
Facility Name Form Approved 03/05/19
NCO083712
Town of Mars Hill OMB No.2040-0004
SECTIONI
11.1
CERTIFICATION STATEMENT (40
In Column 1 below, mark the sections of Form 1 that you have completed and are submitting with your application.
For each section, specify in Column 2 any attachments that you are enclosing to alert the permitting authority. Note
that not all applicants are required to provide attachments.
Column 1
Column 2
❑ Section 1: Activities Requiring an NPDES Permit
❑ w/ attachments
❑✓ Section 2: Name, Mailing Address, and Location
❑ w/ attachments
❑ Section 3: SIC Codes
❑ w/ attachments
0 Section 4: Operator Information
❑ w/ attachments
❑✓ Section 5: Indian Land
❑ wl attachments
❑ Section 6: Existing Environmental Permits
❑ w/ attachments
d
❑✓ Section 7: Map
w/ topographic
❑ El w/ additional attachments
R
map
W
a
w
F/� Section 8: Nature of Business
❑ w/ attachments
0 Section 9: Cooling Water Intake Structures
❑ w/ attachments
-a
❑✓ Section 10: Variance Requests
❑ w/ attachments
❑✓ Section 11: Checklist and Certification Statement
❑ w/ attachments
y
Y
11.2
Certification Statement
U
I certify under penalty of law that this document and all attachments were prepared under my direction or supervision
in accordance with a system designed to assure that qualified personnel properly gather and evaluate the
information submitted. Based on my inquiry of the person or persons who manage the system, or those persons
directly responsible for gathering the information, the information submitted is, to the best of my knowledge and
belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information,
including the possibility of fine and imprisonment for knowing violations.
Name (print or type first and last name)
Official title
Jason Riddle
Public works superintendent
Signature
Date signed
c
EPA Form 3510-1 (revised 3-19) Page 4

tvA menmication Number Nruts rermit Numoer Facility Name Outfall Number Form Approved 03/05/19
NCO083712 Town of Mars Hill 001 OMB No. 2040-0004
TABLE
A. CONVENTIONAL AND NON
CONVENTIONALPOLLUTANTS
Effluent
Intake
Pollutant
Waiver
Requested
Units
0 tional
Maximum
Maximum
Long -Term
(if applicable)
(specify)
Daily
Monthly
Average Daily
Number of
Long -Term
Number of
Discharge
Discharge
Discharge
Analyses
Average Value
Analyses
(required)
if available
if available
❑
Check here if you have applied to your NPDES permitting authority for a waiver for all of the pollutants listed on this table for the noted outfall.
1'
Biochemical oxygen demand
❑
Concentration
Mass
(BOD5)
2'
Chemical oxygen demand
El
Concentration
Mass
(COD)
Concentration
3.
Total organic carbon (TOC)
❑
Mass
Concentration
mg/I
45 mg/I
30mg/I
2/Month
4.
Total suspended solids (TSS)
❑
Mass
Concentration
mg/I
Quarterly
5.
Ammonia (as N)
❑
Mass
6.
Flow
❑
Rate
MGD
2/Month
Temperature (winter)
❑
°C
°C
7.
Temperature (summer)
❑
°C
°C
pH (minimum)
❑
Standard units
S.U.
6.0
6.0
2/Month
8.
pH (maximum)
❑
Standard units
S.U.
9.0
9.0
t Sampling shall be conducted according to sufficiently sensitive test procedures (i.e., methods) approved under 40 CFR 136 for the analysis of pollutants or pollutant parameters or
required under 40 CFR chapter I, subchapter N or 0. See instructions and 40 CFR 122.21(e)(3).
EPA Form 3510-2C (Revised 3-19) Page 9

This page intentionally left blank.

Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
NCO083 I Town of Mars Hill 001 1 OMB No. 2040-0004
Pollutant/Parameter
(and
and CAS Number, if available
Testing
Required
q
Presence or Absence
check one
Units
(specify)
(p Y)
Effluent
Intake
(optional)
Believed
Present
Believed
Absent
Maximum
Daily
Discharge
(required)
Maximum
Monthly
Discharge
(if available)
Long -Term
Average
Daily
Discharge
f available
Number
of
Analyses
Long -
Term
Average
Value
Number
of
Analyses
❑ Check here if you qualify as a small business per the instructions to Form 2C and, therefore, do not need to submit quantitative data for any of the organic toxic pollutants in Sections
2 through 5 of this table. Note, however, that you must still indicate in the appropriate column of this table if you believe any of the pollutants listed are present in your discharge.
Section 1. Toxic Metals, Cyanide, and Total Phenols
1.1
Antimony, total
(7440-36-0)
El
❑
❑
Concentration
Mass
1.2
Arsenic, total
(7440-38-2)
❑
❑
Concentration
Mass
1.3
Beryllium, total
(744041-7)
❑
❑
❑
Concentration
Mass
1.4
Cadmium, total
(7440-43-9)
❑
❑
El
Concentration
Concentration
1.5
Chromium, total
(7440-47-3)
❑
❑
Concentration
Mass
1.6
Copper, total
(7440-50-8)
❑
El
El
Concentration
Mass
1.7
Lead total
(7439-92-1)
❑
El
El
Concentration
Concentration
1.8
Mercury, total
(7439-97-6)
❑
❑
❑
Concentration
Mass
1.9
Nickel, total
(7440-02-0)
❑
❑
❑
Concentration
Mass
1.10
Selenium, total
(7782-49-2)
❑
ElMass
El
Concentration
1.11
Silver, total
(7440-22-4)
El
El
Concentration
Mass
EPA Form 3510-2C (Revised 3-19) Page 11

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
NCO083712 Town of Mars Hill 001 OMB No. 2040-0004
•
1
•
• 1 •-
• •• 1
Effluent
Pollutant/Parameter
(and
(and CAS Number, if available)
Testing
Required
Presence or Absence
check one
Units
(specify)Maximum
Intake
(optional)
Believed
Present
Believed
Absent
Daily
Discharge
(required)
Maximum
Monthly
Discharge
(if available)
Long -Term
Average
Daily
Discharge
f available
Number
of
Analyses
Long -
Term
Average
Value
Number
of
Analyses
1.12
Thallium, total
(7440-28-0)
Concentration
Mass
1.13
Zinc total
(7440-66-6)
Concentration
ug/I
Quarterly
Mass
1.14
Cyanide, total
(57-12-5)
❑
❑
❑�
Concentration
Mass
1.15
Phenols, total
�
�
�
Concentration
Mass
Section 2.Organic Toxic Pollutants (GC/MS Fraction
—Volatile Compounds)
2.1
Acrolein
(107-02-8)
Concentration
Mass
2.2
Acrylonitrile
(107-13-1)
El
El
R
Concentration
Mass
2.3
Benzene
(71-43-2)
❑
El
E
Concentration
Mass
2.4
Bromoform
(75-25-2)
❑
❑�
Concentration
Mass
2 5
Carbon tetrachloride
(56-23-5)
Concentration
Mass
2.6
Chlorobenzene
(108-90-7)
❑
❑
❑
Concentration
Mass
2.7
Chlorodibromomethane
(124-48-1)
❑
❑
❑
Concentration
Mass
2.8
Chloroethane
(75-00-3)
❑
❑
❑�
Concentration
Mass
EPA Form 3510-2C (Revised 3-19) Page 12

LPA Identitication Number NPULS Permit Number Facility Name Outfall Number Form Approved 03/05/19
NCO083712 Town of Mars Hill 001 OMB No. 2040-0004
Pollutant/Parameter
(and CAS Number, if available )
Testing
Required
q
Presence or Absence
check one
Units
(specify)
Effluent
Intake
(optional)
Believed
Present
Believed
Absent
Maximum
Daily
Discharge
(required)
Maximum
Monthly
Discharge
(if available)
Long -Term
Average
Daily
Discharge
if available
Number
of
Analyses
Long-
Term
Average
Value
Number
of
Analyses
2.9
2-chloroethylvinyl ether
(110-75-8)
1:1
El
✓
Concentration
Mass
2.10
Chloroform (67-66-3)
❑
❑
Concentration
Mass
2.11
Dichlorobromomethane
(75-274)
❑
❑
Concentration
Mass
212
11-dichloroethane
(75-34-3)
❑
❑
❑
Concentration
Mass
2.13
1,2-dichloroethane
(107-06-2)
Concentration
Mass
2.14
11-dichloroethylene
(75-354)
❑
❑
Concentration
Mass
2.15
1,2-dichloropropane
(78-87-5)
❑
❑
Concentration
Mass
2.16
1,3-dichloropropylene
(542-75-6)
❑
❑�
Concentration
Mass
217
Ethylbenzene
(100414)
❑
O
Concentration
Mass
218
Methyl bromide
(74-83-9)
Concentration
Mass
219
Methyl chloride
(74-87-3)
Concentration
Mass
2.20
Methylene chloride
(75-09-2)
Concentration
Mass
2.21
1 1,2 2- tetrachloroethane
(79-34-5)
Concentration
Mass
EPA Form 3510-2C (Revised 3-19) Page 13

EPA Identification Number
NC0083712
Facility Name
Town of Mars Hill
Outfall Number
001
Form Approved 03/05/19
OMB No. 2040-0004
Pollutant/Parameter
(and
(and CAS Number, if available)
Testing
Required
Presence or Absence
cneck one
Units
(p fv)
(specify)
Effluent
Intake
(optional)
Believed
Present
Believed
Absent
Maximum
Daily
Discharge
(required)
Maximum
Monthly
Discharge
(if available)
Long -Term
Average
Daily
Discharge
if available
Number
of
Analyses
Long -
Term
Average
Value
Number
of
Analyses
2.22
Tetrachloroethylene
(127-18-4)
✓
Concentration
Mass
2.23
Toluene
(108-88-3)
El
❑
❑
Concentration
Mass
2.24
12-trans-dichloroethylene
(156-60-5)
El
El
❑
Concentration
Mass
2.25
1,1,1-trichloroethane
(71-55-6)
❑
❑
✓
Concentration
Mass
2.26
1,1,2-trichloroethane
(79-00-5)
❑
Concentration
Mass
2.27
Trichloroethylene
(79-01-6)
El
❑
Concentration
Mass
2.28
Vinyl chloride
(75-01-4)
❑
✓
Concentration
Mass
Section 3.Organic Toxic Pollutants (GC/MS
Fraction
—Acid Compounds)
3.1
2-chlorophenol
(95-57-8)
❑
❑
21
Concentration
Mass
3.2
2 4-dichlorophenol
(120-83-2)
❑
❑
Concentration
Mass
3.3
2 4-dimethylphenol
(105-67-9)
1:1Concentration
Mass
3.4
4 6-dinitro-o-cresol
(534-52-1)
1:1Concentration
Mass
r3.5
2 4-dinitrophenol
(51-28-5)
❑
Concentration
Mass
EPA Form 3510-2C (Revised 3-19) Page 14

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
NC0083712 Town of Mars Hill 001 OMB No. 2040-0004
Pollutant/Parameter
(and
(and CAS Number, if available)
Testing
Required
Presence or Absence
check one
Units
(specify)
Effluent
Intake
(optional)
Believed
Present
Believed
Absent
Maximum
Daily
y
Discharge
(required)
Maximum
Monthly
y
Discharge
(if available)
Long -Term
Average
Daily
Discharge
f available
Number
of
Analyses
Long -
Term
Average
Value
Number
of
Analyses
3.6
2-nitrophenol
(88-75-5)
El
El
Concentration
Mass
3.7
4-nitrophenol
(100-02-7)
El❑
Concentration
Mass
3.8
p-chloro-m-cresol
(59-50-7)
El❑
Concentration
Mass
3.9
Pentachlorophenol
(87-86-5)
El
El
Concentration
Mass
3.10
Phenol
(108-95-2)
El
El
❑
Concentration
Mass
3.11
2,4,6-trichlorophenol
(88-05-2)
❑
✓
Concentration
Mass
Section 4.Organic Toxic Pollutants (GC/MS
Fraction
—Base /Neutral
Compounds)
4.1
Acenaphthene
(83-32-9)
❑
Concentration
Mass
4.2
Acenaphthylene
(208-96-8)
❑
Concentration
Mass
4.3
Anthracene
(120-12-7)
El
El
Concentration
Mass
4.4
Benzidine
(92-87-5)
✓
Concentration
Mass
4.5
Benzo (a) anthracene
(56-55-3)
ElConcentration
Mass
4.6
Benzo (a) pyrene
(50-32-8)
21
Concentration
Mass
EPA Form 3510-2C (Revised 3-19) Page 15

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
NCO083712 Town of Mars Hill 001 OMB No. 2040-0004
• 11jjSLMjW•
I •'
• '• 1
Presence or Absence
check one
Effluent
Intake
(optional)
Pollutant/Parameter
Testing
Units
Maximum
Maximum
Long -Term
Long-
(and CAS Number, if available )
Required
q
Believed
Believed
(specify)
(p �v)
Daily
Monthly
Average
Number
Term
Number
Present
Absent
Discharge
Discharge
Daily
of
Average
of
(required)
(if available)
Discharge
Analyses
Value
Analyses
f available
4.7
3,4-benzofluoranthene
E]
El
❑
Concentration
Mass
(205-99-2)
4.8
Benzo (ghi) perylene
Concentration
Mass
(191-24-2)
4.9
Benzo (k) fluoranthene
Concentration
Mass
(207-08-9)
4.10
Bis (2-chloroethoxy) methane
❑
ElE
Concentration
Mass
(111-91-1)
4.11
Bis (2-chloroethyl) ether
❑
EConcentration
Mass
(111-44-4)
4.12
Bis (2-chloroisopropyl) ether
Concentration
Mass
(102-80-1)
4.13
Bis (2-ethylhexyl) phthalate
❑
E]z
Concentration
Mass
(117-81-7)
4.14
4-bromophenyl phenyl ether
❑
E]Z
Concentration
Mass
(101-55-3)
4.15
Butyl benzyl phthalate
❑
❑
E
Concentration
Mass
(85-68-7)
4.16
2-chloronaphthalene
❑
❑
❑
Concentration
Mass
(91-58-7)
4.17
4-chlorophenyl phenyl ether
Concentration
Mass
(7005-72-3)
4.18
Chrysene
Concentration
Mass
(218-01-9)
4.19
Dibenzo (a,h) anthracene
Concentration
Mass
(53-70-3)
EPA Form 3510-2C (Revised 3-19) Page 16

Number NPDES Permit Number Facility Name Outfall Number Form Approved 03105/19
NCO083712 Town of Mars Hill 001 OMB No.2040-0004
•I
I to]all
• •
• • •
Intake
(optional)
Pollutant/Parameter
(and CAS Number, if available)
Testing
Required
Presence or Absence
check one
Units
(specify)
Effluent
Believed
Present
Believed
Absent
Maximum
Daily
Discharge
(required)
Maximum
Monthly
Discharge
(if available)
Long -Term
Average
Daily
Discharge
f available
Number
of
Analyses
Long-
Term
Average
Value
Number
of
Analyses
4.20
12-dichlorobenzene
(95-50-1)
❑
❑
❑�
Concentration
Mass
4. A
1 3-dichlorobenzene
(541-73-1)
El
El
Concentration
Mass
4.22
14-dichlorobenzene
(106-46-7)
✓
Concentration
Mass
4.23
3,3-dichlorobenzidine
(91-94-1)
❑
El
El
Concentration
Mass
4.24
Diethyl phthalate
(84-66-2)
❑
Concentration
Mass
4.25
Dimethyl phthalate
(131-11-3)
Concentration
Mass
4.26
Di-n-butyl phthalate
(84-74-2)
El
❑
✓❑
Concentration
Mass
4.27
2 4-dinitrotoluene
(121-14-2)
❑
❑
❑✓
Concentration
Mass
4.218
2 6-dinitrotoluene
(606-20-2)
❑
❑
❑�
Concentration
Mass
4.219
Di-n-octyl phthalate
(117-84-0)
❑
❑
E
Concentration
Mass
4.30
1,2-Diphenylhydrazine
(as azobenzene)(122-66-7)
11
El
D
Concentration
Mass
4.31
Fluoranthene
(206-44-0)
Concentration
Mass
4.32
Fluorene
(86-73-7)
❑
Z
Concentration
Mass
EPA Form 3510-2C (Revised 3-19) Page 17

EPA Identification Number NPDES Permit Number Facility Name Outfall Number
NCO083712 Town of Mars Hill T001
Form Approved 03/05/19
OMB No. 2040-0004
Pollutant/Parameter
(and CAS Number, if available)
Testing
Required
Presence or Absence
check one
Units
(specify)Maximum
Effluent
Intake
(optional)
Believed
Present
Believed
Absent
Daily
Discharge
(required)
Maximum
Monthly
Discharge
(if available)
Long•Term
Average
Average
Daily
Discharge
if available
Number
of
Analyses
Long -
Term
Average
Value
Number
of
Analyses
4.33
Hexachlorobenzene
(118-74-1)
ElConcentration
Mass
4.34
Hexachlorobutadiene
(87-68-3)
El
11
✓
Concentration
Mass
4.35
Hexachlorocyclopentadiene
(77 47-4)
El
El
Concentration
Mass
4.36
Hexachloroethane
(67-72-1)
❑
✓
Concentration
Mass
4.37
Indeno (1,2,3-cd) pyrene
(193-39-5)
El❑
Concentration
Mass
4.38
Isophorone
(78-59-1)
❑
✓
Concentration
Mass
4.39
Naphthalene
(91-20-3)
Concentration
Mass
4.40
Nitrobenzene
(98-95-3)
El
11
ElConcentration
Mass
4.41
N-nitrosodimethylamine
(62 75 9)
❑
✓
Concentration
Mass
4.42
N-nitrosodi-n-propylamine
(621-64-7)
Concentration
Mass
4.43
N-nitrosodiphenylamine
(86-30-6)
❑
❑
Concentration
Mass
4.44
Phenanthrene
(85-01-8)
El
❑
❑
Concentration
Mass
4.45
Pyrene
(129-00-0)
❑
❑
Concentration
Mass
EPA Form 3510-2C (Revised 3-19) Page 18

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
NCO083712 Town of Mars Hill 001 OMB No. 2040-0004
Presence or Absence
check one
Effluent
Intake
(optional)
Pollutant/Parameter
Testing
Units
Maximum
Maximum
Long -Term
Long-
(and CAS Number, if available )
14.46
Required
q
Believed
Believed
(specify)
Average
Number
Number
Present
Absent
Daily
Monthly
Daily
of
Term
of
Discharge
Discharge
Discharge
Analyses
Average
Analyses
(required)
(if available)
if available
Value
1 2 4-trichlorobenzene
Elz
Concentration
Mass
(120-82-1)
Section 5.Organic Toxic Pollutants (GC/MS Fraction
—Pesticides)
5.1
Aldrin
❑
❑
❑
Concentration
Mass
Concentration
(309-00-2)
5.2
a-BHC
Mass
—
(319-84-6)
5.3
R-BHC
El
E
Concentration
Mass
(319-85-7)
5.4
y-BHC
Concentration
Mass
(58-89-9)
5.5
b-BHC
Concentration
Mass
(319-86-8)
5.6
Chlordane
✓
Concentration
Mass
(57-74-9)
5.7
4,4'-DDT
El✓
Concentration
Mass
(50-29-3)
5.8
4,4'-DDE
✓
Concentration
Mass
(72-55-9)
5.9
4 4'-DDD
11
El
✓
Concentration
Mass
(72-54-8)
5.10
Dieldrin
El
1:1
El
Concentration
Mass
(60-57-1)
5.11
a-endosulfan
❑
❑
Concentration
Mass
(115-29-7)
EPA Form 3510-2C (Revised 3-19) Page 19

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
NCO083712 Town of Mars Hill 001 1 OMB No. 2040-0004
Pollutant/Parameter
(and CAS Number, if available)
Testing
Required
Presence or Absence
check one
Units
(specify)
Effluent
Intake
(optional)
Believed
Present
Believed
Absent
Maximum
Daily
Discharge
(required)
Maximum
Monthly
Discharge
(if available)
Long -Term
Average
Daily
Discharge
f available
Number
of
Analyses
Long-
Term
Average
Value
Number
of
Analyses
5.12
Q-endosulfan
(115-29-7)
El
El
✓
Concentration
Mass
5.13
Endosulfan sulfate
(1031-07-8)
El
✓
Concentration
Mass
5.14
Endrin
(72-20-8)
21
Concentration
Mass
5.15
Endrin aldehyde
(7421-93-4)
✓
Concentration
Mass
5.16
Heptachlor
(76-44-8)
Concentration
Mass
5.17
Heptachlor epoxide
(1024-57-3)
0
Concentration
Mass
5.18
PCB-1242
(53469-21-9)
Concentration
Mass
5.19
PCB-1254
(11097-69-1)
Concentration
Mass
5.20
PCB-1221
(11104-28-2)
Concentration
Mass
5.21
PCB-1232
(11141-16-5)
Concentration
Mass
5.22
PCB-1248
(12672-29-6)
Concentration
Mass
5.23
PCB-1260
(11096-82-5)
Concentration
Mass
5.24
PCB-1016
(12674-11-2)
Concentration
Mass
EPA Form 3510-2C (Revised 3-19) Page 20

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
NCOO83712 Town of Mars Hill 001 OMB No. 2040-0004
Presence or Absence
check one
Effluent
Intake
(optional)
Pollutant/Parameter
(and CAS Number, if available)
Testing
Required
Believed
Believed
Units
(specify)
Maximum
Maximum
Long -Term
Average
Number
Long -
Number
Present
Absent
Daily
Monthly
Daily
of
Term
of
Discharge
Discharge
Discharge
Analyses
Average
Analyses
(required)
(if available)
if available
Value
Toxaphene
5.25
❑
❑
❑
Concentration
Mass
(8001-35-2)
I Sampling shall be conducted according to sufficiently sensitive test procedures (i.e., methods) approved under 40 CFR 136 for the analysis of pollutants or pollutant parameters or
required under 40 CFR chapter I, subchapter N or 0. See instructions and 40 CFR 122.21(e)(3).
EPA Form 3510-2C (Revised 3-19) Page 2'

This page intentionally left blank.

LF'A Identitication Number
NCOO83712
Facility Name
Town of Mars Hill
Outfall Number
001
Form Approved 03/05/19
OMB No. 2040-0004
Presence or Absence
check one
Effluent
Intake
(Optional)
Pollutant
Believed
Believed
Units
(specify)
Maximum Daily
Maximum
Long -Term
Long -Term
Present
Absent
Discharge
Monthly
Average Daily
Number of
Average
Number of
(required)
Discharge
Discharge
Analyses
Value
Analyses
if available
if available
❑ Check here if you believe all pollutants on Table C to be present in your discharge from the noted outfall. You need not complete the 'Presence or Absence" column of Table C for
each pollutant.
❑ Check here if you believe all pollutants on Table C to be absent in your discharge from the noted outfall. You need not complete the "Presence or Absence" column of Table C for
each pollutant.
1
Bromide
❑
❑
Concentration
Mass
(24959-67-9)
2
Chlorine, total
El
ElConcentration
x
28 ug/l
2/Month
Mass
residual
3.
Color
❑
21
Concentration
Mass
4.
Fecal coliform
❑
0
Concentration
Mass
5
Fluoride
❑
❑
Concentration
Mass
(16984-48-8)
6
Nitrate -nitrite
❑
ElConcentrationMass
7.
Nitrogen, total
❑
Q
Concentration
Mass
organic (as N)
8.
Oil and grease
El
ElConcentrationMass
9.
Phosphorus (as
❑
El
Concentration
Concentration
P), total (7723-14-0)
10.
Sulfate (as SO4)
❑
❑
Concentration
Mass
(14808-79-8)
.
F
Sulfide (as S)
El
El
Concentration
Mass
EPA Form 3510-2C (Revised 3-19) Page 23

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
NCO083712 Town of Mars Hill 001 OMB No. 2040-0004
Pollutant
Units
(specify)
Effluent
Intake
(Optional)
Presence or Absence
check one
Believed
Present
Believed
Absent
Maximum Daily
Discharge
(required)
Maximum
Monthly
Discharge
if available
Long -Term
Average Daily
Discharge
if available
Number of
Analyses
Long -Term
Average
Value
Number of
Analyses
12
Sulfite (as S03)
(1426545-3)
El✓
Concentration
Mass
13.
Surfactants
❑
El
Concentration
Mass
14.
Aluminum, total
(7429-90-5)
Concentration
ug/l
Quarterly
Mass
15.
Barium, total
(7440-39-3)
Concentration
Mass
16.
Boron total
(7440-42-8)
El
21
Concentration
Mass
17.
Cobalt total
(7440-48-4)
El
21
Concentration
Mass
18.
Iron, total
(7439-89-6)
Concentration
Mass
1 9'
Magnesium, total
(7439-95.4)
El
El
Concentration
Mass
20.
Molybdenum,
total
7439-98-7
Concentration
Mass
21
Manganese, total
(7439-96-0)
❑
❑
Concentration
Mass
22
Tin, total
(7440-31-5)
❑
Q
Concentration
Mass
23
Titanium, total
(7440-32-6)
Concentration
Mass
EPA Form 3510-2C (Revised 3-19) Page 24

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
NCO083712 Town of Mars Hill 001 OMB No. 2040-0004
Presence or Absence
check one
Effluent
Intake
(Optional)
Pollutant
Believed
Believed
Units
(specify)
Maximum Daily
Maximum
Long -Term
Long -Term
Present
Absent
Discharge
Monthly
Average Daily
Number of
Average
Number of
(required)
Discharge
Discharge
Analyses
Value
Analyses
f available
if available
24.
Radioactivity
Alpha, total
❑
0
Concentration
Mass
Beta, total
❑
0
Concentration
Mass
Radium, total
El
El
Concentration
Mass
Radium 226, total
❑
0
Concentration
Mass
15ampling shall be conducted according to sufficiently sensitive test procedures (i.e., methods) approved under 40 CFR 136 for the analysis of pollutants or pollutant parameters or
required under 40 CFR chapter I, subchapter N or 0. See instructions and 40 CFR 122.21(e)(3).
EPA Form 3510-2C (Revised 3-19) Page 25

i
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23
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Facility -Information
Town of Mars Hill state Grid: osrw
County Boundary Mars Hilf WTP-Lagoon f - - u363 Quad: Bald creek
NP[]ES discharger NC00$3712 . - - sunbas;n: oa-os-os
/ Fb_hy.shp Madison County AMIE
A/ Highways
Municipal boundary
N 1 0 1 Miles -

e
t
, 4
,
McGffl.
McGifl- raw Water Map legend
.4530C Ti,. TFS - -= -�r:.
' rreatmentPtanc
Sewer Map Legend - s 1 y` Raw Water Reservoir
TreatmentPlarit ! Storage Tank
Odor Control Station Z Control Va?ve
Pump Station Z System Valve
Z Air Release Valve f
Pumo Station
0 Manhole
0 Unverified Manhole` -, Hydrant
g -Gravity Sewer Master Meter
, • -
Unverified Gravity Se,.ver VVater Mains
Force %lain Ya• Water Line
S
e
Go,),,ale earth feet 200
meters, 70 '

NCO083712
Town of Mars Hill Water Plant Lagoon
Solids Handling Plan
At the current time The Town of Mars Hill is utilizing a Geotube to dewater our Alum
Sludge. We have a temporary permit to place the Geotube above the Lagoon and the
effluent from the Geotube is carried back to the Lagoon before discharge. At such time
when the Geotube is full and dry the town will haul the alum sludge to an approved
landfill or disposal site. The lagoon will hold sludge for 5 to 7 years before it requires
pumping.

From: Richards, Emilv
To: "Nathan Bennett"; robmsamsCalvahoo.com; Jason Riddle
Subject: RE: [External] Re: Electronic Delivery of NPDES Permit NCO083712
Date: Friday, March 17, 2023 11:22:00 AM
Attachments: NCO083712 Final Permit 03-2023.Ddf
image001.g_na
Thank you for your reply. Please see attached.
Emily Richards (she/her)
Environmental Specialist II
Division of Water Resources, Central Office
North Carolina Department of Environmental Quality
Phone: [phone]
emily.richards(@ncdenr.gov
Q:>
NORTH CAROLINA
Department of Environmental Quality
Email correspondence to and from this address is subject to the North
Carolina Public Records Law and may be disclosed to third parties.
From: Nathan Bennett <[e-mail]>
Sent: Friday, March 17, 2023 11:20 AM
To: Richards, Emily <[e-mail]>; [e-mail]; Jason Riddle
<[e-mail]>
Subject: [External] Re: Electronic Delivery of NPDES Permit NCO083712
CAUTION: External email. Do not click links or open attachments unless you verify. Send all suspicious email as an
attachment to Report Spam.
YES, electronic documents is acceptable to the Town of Mars Hill.
Thanks,
Nathan
NATHAN R. BENNETT
Town Manager

k1•
r
0 4
THE TOWN OF frJt 1n�a.a��
MARS HILL
28o North Main Street
�*
Mars Hill, NC 28754
Phone: [phone]
On the Web: www.TownOfMarsHill.org
From: Richards, Emily <emily.rich ards(@ncdenr.gov>
Sent: Friday, March 17, 2023 9:36 AM
To: robmsams(@yahoo.com <robmsams(.yahoo.com>; Nathan Bennett
<nben nett(cDtownofmarshill.org>; Jason Riddle <iriddle(@townofmarshill.org>
Subject: Electronic Delivery of NPDES Permit NCO083712
Good Afternoon,
This message is in regards to the NPDES wastewater permit for Mars Hill WTP /NC0083712.
In order to provide more convenience, control, and security to our permittees and assist them in
processing their transactions, The Division of Water Resources is currently transitioning towards
electronic correspondence. This will hopefully provide more efficient service to our permittees and
other partners and will allow us to more effectively process and track documents. We are writing to
ask you for your approval of the transmittal of documents related to your permitting and related
activities with the Division in an electronic format. Documents will be emailed to the appropriate
contact person(s) in your organization in a PDF format.
Please respond to me through email with verification that transmittal of your documents in an
electronic manner is acceptable to you. If you have any questions, please feel free to contact
me.
Thank you,
Emily Richards (she/her)
Environmental Specialist II
Division of Water Resources, Central Office
North Carolina Department of Environmental Quality

Phone: [phone]
emily.richards(@ncdenr.gov
Q:>
NORTH CAROLINA -
Department of Environmental Quality
Email correspondence to and from this address is subject to the North
Carolina Public Records Law and may be disclosed to third parties.