NC0025534_Draft Permit_20170712

Water Resources
ENVIRONMENTAL QUALITY
July 12, 2017
Lee Smith, Water & Sewer Utilities Director
City of Hendersonville
305 Williams Street
Hendersonville, North Carolina 28792
Dear Mr. Smith:
ROY COOPER
CVV MCY
MICHAEL S. REG AN
S. JAI' ZIMMERMAN
A7 wor
Subject: Draft NPDES Permit Renewal
Permit NCO025534
Hendersonville WWTP, Class 4
Henderson County
SIC Code 4592
Enclosed with this letter is a copy of the Draft NPDES permit renewal for your facility. Please
review this draft carefully to ensure thorough understanding of the requirements and conditions it
contains. There are several changes from the existing permit, including the following:
• 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. Effluent
hardness and instream hardness sampling, upstream of the discharge, has been added to
this permit at a monitoring frequency of quarterly. [See Specific Conditions A. (1.) and
A. (2.) Effluent Limitations and Monitoring Requirements.]
Effluent mercury data was reviewed from January 2012 to September 2016. The Permittee
tested effluent mercury using EPA test Method 1631 E throughout this period. In
accordance with the 2012 Mercury TMDL NPDES Guidance, the Permittee needs to show
annual mean effluent concentrations below both the Water Quality Based Effluent
Limitation (WQBEL) of 68.3 ng/L and the Technology Based Effluent Limitation (TBEL)
State of North Carolina I Environmental Quality I Water Resources
1617 Mail Service Center I Raleigh, North Carolina 27699-1617
919 807 6300

Page 12
of 47 ng/L. A review of the data showed that the annual averages were below both the
WQBEL and the TBEL, therefore, no mercury limitation is required.
Eighteen (18) out of 21 low level effluent mercury samples collected were over 1 ng/L. As
a result, a Mercury Minimization Plan (MMP) requirement has been added to this permit
renewal. See Special Condition A. (7.). Please note that the Permittee shall develop and
implement a MMP during this permit term. The MMP shall be developed within 180
days of the NPDES Permit Effective Date, and shall be available for inspection on-
site. A sample MMP was developed through a stakeholder review process and has
been placed on the Division website for guidance
(http://portal.nedenr.org/web/wq/swp/ps/npdes, under Model Mercury Minimization
Plan). i
Based on the new WQS approved on April 6, 2016 for dissolved metals, a monthly average
limit of 37.5 µg/L and a daily maximum limit of 42.8 µg/L for Total Copper have been
added to the permit for the facility expansion to 6.0 MGD permitted flow, and samples
shall be taken monthly upon expansion. Results of a reasonable potential analysis on
submitted data indicated a reasonable potential to exceed the instream WQS.
• Quarterly monitoring for Total Nickel and Total Copper (Copper at the current 4.8 MGD
permitted flow only) are retained in the permit. Results of a reasonable potential analysis
on submitted data indicated no reasonable potential to exceed the water quality standard of
each pollutant in the receiving stream, but the maximum predicted concentration of each
pollutant was greater than 50% of its respective allowable concentration.
• Monitoring for Total Zinc has been deleted from the permit, but quarterly monitoring shall
continue as part of the Long Term Monitoring Program. Results of a reasonable potential
analysis on submitted data indicated no reasonable potential to exceed the water quality
standards in the receiving stream.
• Review of submitted effluent data showed all samples for Total Silver to be less than
detection at 5 gg/L. In accordance with 15A NCAC 2B .0500, all test procedures must
produce detection and reporting levels that are below the permit discharge requirements
and all data generated must be reported to the approved detection level or lower reporting
level of the procedure. Currently, DWR's laboratory identifies the Practical Quantification
Limit (PQL) for Total Silver at < 1 µg/L. The allowable discharge concentration for Total
Silver at your facility is 0.34 pg/L as a monthly average. Therefore, the best your facility
can do is to sample for Total Silver down to the lower reporting level of the procedure,
which is < 1 pg/L. Quarterly Total Silver effluent sampling has been added to your permit.
The City should implement "clean" sampling techniques and have silver analyzed down to
the PQL of < 1 µg/L.
• Monitoring and limits for Total Residual Chlorine (TRC) have been deleted from the
permit in recognition that the facility does not use chlorination for disinfection.

Page 13
Monitoring for Bis(2-ethylhexyl)phthalate have been deleted from the permit, in agreement
with the request of the Permittee. Review of submitted data indicated no detected
concentrations above 5 pg/L.
Frequency of the Effluent Pollutant Scan have been reduced from annually to three years
within the permit term per 40 CFR 122. Effluent Pollutant Scans shall be sampled in years
2018, 2019 and 2020. [See Special Condition A. (5.).]
Federal regulations require electronic submittal of all discharge monitoring reports
(DMRs) and program reports. The final NPDES Electronic Reporting Rule was adopted
and became effective on December 21, 2015. The requirement to begin reporting discharge
monitoring data electronically using the NC DWR's Electronic Discharge Monitoring
Report (eDMR) internet application has been added to your final NPDES permit. [See
Special Condition A. (6.).]
For information on eDMR, registering for eDMR and obtaining an eDMR user account,
please visit the following web page: hlW:Hdeg.nc.gov/about/divisions/water-
resources/edmr.
For more information on EPA's final NPDES Electronic Reporting Rule, please visit the
following web site: httys://www.federalre 'ster.gov/documents/2015/10/22/2015-
24954/national-pollutant-discharge-elimination-system-npdes-electronic-reporting-rule.
Please note that the receiving stream is listed as impaired for benthos and fish community on the
North Carolina 2014 303(d) Impaired Waters List. Addressing impaired waters is a high priority
with the Division, and instream data will continue to be evaluated. If there is noncompliance with
permitted effluent limits and stream impairment can be attributed to your facility, then mitigative
measures may be required.
Concurrent with this notification the Division is publishing a notice in a newspaper having
circulation in the general Henderson County area, soliciting public comments on this draft permit.
Please provide any written comments you may have to the following: NCDEQ/DWR, NPDES
Permitting Branch, 1617 Mail Service Center, Raleigh, NC 27699-1617 no later than 30 days after
receipt of this draft permit.
Following the 30 -day public comment period, the Division will review all pertinent comments and
take appropriate action prior to issuing a final permit. If you have questions concerning this draft
permit, please call me at [phone] or by email at [e-mail].
Sincerely,
�Z�XD
Gary Perlmutter, Environmental Senior Specialist
NPDES Complex Permitting Unit

Page 14
Hardcopy: NPDES Files
eCopy: US EPA Region 4
DWR / Operator Certification Unit / Maureen Kinney
DWR / Aquatic Toxicology Branch / Susan Meadows
DWR / Asheville Regional Office / Water Quality Operations

Permit NCO025534
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provision of North Carolina General Statute 143-215.1, other lawful standards
and regulations promulgated and adopted by the North Carolina Environmental Management
Commission, and the Federal Water Pollution Control Act, as amended, the
City of Hendersonville
is hereby authorized to discharge wastewater from a facility located at the
Hendersonville WWTP
99 Balfour Road
Hendersonville, NC 28792
Henderson County
to receiving waters designated as Mud Creek in the French Broad River Basin in accordance with
effluent limitations, monitoring requirements, and other conditions set forth in Parts I, II, III and IV
hereof.
This permit shall become effective XXXX 1, 2017.
This permit and authorization to discharge shall expire at midnight on March 31, 2021.
Signed this day XXXX 1, 2017.
V aA F T
S. Jay Zimmerman, P.G.
Division of Water Resources
By Authority of the Environmental Management Commission

Permit NC0025534
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby
revoked. As of this permit issuance, any previously issued permit bearing this number is no longer
effective. Therefore, the exclusive authority to operate and discharge from this facility arises under the
permit conditions, requirements, terms, and provisions included herein.
The City of Hendersonville is hereby authorized to:
1. Continue to operate an existing 4.8 MGD wastewater tratment system consisting of the following:
♦ Influent pump station
♦ Dual mechanical bar screens
♦ Dual grit chamber
♦ Dual aeration basins
♦ Three centrifugal blowers,
♦ Dual clarifiers
♦ Recycle pump stations
♦ Dual effluent filters �.
♦ Ultraviolet disinfection
♦ Dual gravity thickeners
♦ Sludge dewatering
The facility is located at the Henderson Wastewater Treatment Plant, 99 Balfour Road, near
Balfour, in Henderson County;
2. Upon issuance of an Authorization to Construct permit from the Division of Water Quality and
submission of the engineers' certification for expansion, operate a wastewater treatment facility up
to a design flow of 6.0 MGD (Phase II construction); and
3. Discharge from said treatment works at the location specified on the attached map into Mud Creek,
classified C waters in the French Broad River Basin.
Page 2 of 17

Permit NCO025534
PART I
A.(1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (4.8 MGD) [ 15A
NCAC 02B .0400 et seq., 02B .0500 et seq.]
a. During the period beginning on the effective date and lasting until expansion above 4.8 MGD, the
Permittee is authorized to discharge treated wastewater from Outfa❑ 001. Such discharges shall
be limited and monitored' by the Permittee as specified below:
All footnotes are listed on the following page.
Page 3 of 17
LIMITS
MONITORING REQUIREMENTS
EFFLUENT
Monthly
Weekly
Daily
Measurement
Sample
Sample Location2
CHARACTERISTICS
Average
Average
Maximum
Frequency
Type
Flow
4 8 MGD
Continuous
Recording
Influent or Effluent
BOD, 5 -day, 20°C (Summer
between April 1 through October
10 0 mg/L
15 0 mg/L
Daily
Composite
Influent & Effluent
31)3
y
BOD, 5 -day, 20°C (Winter
between November 1 through
20 0 mg/L
30 0 mg/L,/
��
Daily
Composite
Influent & Effluent
March 31)3
�aY
�li
Total Suspended Solids (TSS) 3
30 0 mglL
45 0 mglL
�'
Dad y
Composite
p
Influent & Effluent
NH3 as N (Summer between
2 0 mg/L
6 0 mg/L
�,�
_A
Daily
Composite
Effluent
April 1 through October 31)
NH3 as N (Winter between
4 0 mg/L
12 0 mg/L
t
Daily
Composite
Effluent
November 1 through March 31)
Dissolved Oxygen
Daily Average >_ 5 0 mg/L
Daily
Grab
Effluent
Fecal Coliform (geometric mean)f
200/100 mL
I 400/100 mL
Daily
Grab
Effluent
pH
Between 6 0 and 9 0 Standard Units
Daily
Grab
Effluent
Temperature (°C)
Monitor and Report
Daily
Grab
Effluent
Total Nitrogen (mg/L)4
Monitor and Report
Quarterly
Composite
Effluent
Total Phosphorus (mg/L)
Morntor and Report
Quarterly
Composite
Effluent
Total Copper (µg/L)
Monitor and Report
Quarterly
Composite
Effluent
Total Nickel (µg/L)
Monitor and Report
Quarterly
Composite
Effluent
Total Silver (µg/L)5
Monito(and Report
Quarterly
Composite
Effluent
Total Hardness as [CaCO3 or
Monitor and Report
P
Quarter' Y
Composite
P
Effluent
(Ca + Mg)] (mg/L)6
Chronic Toxicity?
Quarterly
Composite
Effluent
Effluent Pollutant Scan
Monitor and Report
Footnote 8
Footnote 8
Effluent
Total Hardness as [CaCO3 or
Monitor and Report
Quarterly
Grab
Upstream
+ M9)] (m9/L)9
Temperature (°C)10
Footnote 10
Grab
Upstream,
Downstream
Fecal Coliform
Footnote 10
Grab
Upstream,
(No colonies/100 mL)10
Downstream
Dissolved Oxygen (mg/L)10
Footnote 10
Grab
Upstream,
Downstream
All footnotes are listed on the following page.
Page 3 of 17

Permit NC0025534
Footnotes:
1. Submit discharge monitoring reports electronically using NC DWR's eDMR application system. See
Special Condition A (6.).
2. Upstream is in Mud Creek above outfall. Downstream is at NCSR 1365.
3. The monthly average effluent BODS and Total Suspended Solids concentrations shall not exceed
15% of the respective influent value (85% removal).
4. Total Nitrogen = TKN + NO3-N + NO2-N, where TKN is Total Kjeldahl Nitrogen, NO3-N is Nitrate
Nitrogen, and NO2-N is Nitrite Nitrogen.
5. Total Silver samples should be analyzed to the lower detection limit approximately to < 1 µg/L.
6. Effluent Total Hardness sampling should be performed in conjunction with metals sampling.
7. Whole Effluent Toxicity shall be monitored using the Pass/Fail Chronic Toxicity test using
Ceriodaphnia at 18% effluent. Samples shall be taken in February, May, August & November; see
Special Condition A. (3.).
8. The Permittee shall perform three Effluent Pollutant Scans during the term of this permit; see Special
Condition A. (5.).
9. The Permittee shall sample mstream Total Hardness, upstream 'of the facility's discharge. The
sample shall be representative of the hardness in the receiving stream:
10. Samples shall be collected three times per week from June 1 through September 30 and once per
week from October 1 through May 31. `
b. There shall be no discharge of floating solids or visible foam in other than trace amounts
Page 4 of 17

Permit NCO025534
A.(2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (6.0 MGD) [ 15A
NCAC 02B.0400 et seq., 02B 0500 et seq.]
a. Beginning upon the receipt of the Engineer's Certification for completion of the 6.0 MGD expansion
and lasting until expiration, the Permittee is authorized to discharge treated wastewater from
Outfall 001. Such discharges shall be limited and monitored' by the Permittee as specified below:
All footnotes are listed on the following page.
Page 5of17
LIMITS
MONITORING REQUIREMENTS
EFFLUENT
Monthly
Weekly
Daily
Measurement
Sample
Sample Location2
CHARACTERISTICS
Average
Average
Maximum
Frequency
Type
Flow
6 0 MGD
Continuous
Recording
Influent or Effluent
BOD, 5 -day, 20°C (Summer
between April 1 through October
10 0 mg/L
15 0 mg/L
Daily
Composite
Influent & Effluent
31)3
BOD, 5 -day, 20°C (Winter
between November 1 through
20 0 mg/L
30 0 mg/L
Daily
Composite
Influent & Effluent
March 31)3
Total Suspended Solids (TSS)3
30 0 mg/L
45 0 mg/L
Daily
Composite
Influent & Effluent
NH3 as N (Summer between
2 0 mg/L
6 0 mg/L
Daily
Composite
Effluent
April 1 through October 31)
NH3 as N (Winter between
4 0 mg/L
12:0 mg/L
Daily
Composite
Effluent
November 1 through March 31)
Dissolved Oxygen (DO)
Daily Average z 5.0 mg/L
Daily
Grab
Effluent
Fecal Coliform (geometric mean)
200/100 mL
400/100 mL
Daily
Grab
Effluent
pH
Between 6 0 and 9 0 Standard Units
Daily
Grab
Effluent
Temperature (°C)
Monitor and Report
Daily
Grab
Effluent
Total Nitrogen (mg/L)4
Monitor and Report
Quarterly
Composite
Effluent
Total Phosphorus (mg/L)
Monitor and Report
Quarterly
Composite
Effluent
Total Copper
37 5 µg/L
42 8µg/L
I
Monthly
Composite
Effluent
Total Nickel (µg/l-)
Monitor and Report
Quarterly
Composite
Effluent
Total Silver (µg/L)5
Monitor and Report
Quarterly
Composite
Effluent
Total Hardness as [CaCO3 or
Monitor and Report
Quarterly
Composite
Effluent
(Ca + Mg)] (m9/L)s
Chronic Toxicity?
Quarterly
Composite
Effluent
Effluent Pollutant Scan
Monitor and Report
Footnote 8
Footnote 8
Effluent
Total Hardness as [CaCO3 or
Monitor and Report
Quarterly
Grab
Upstream
(Ca + Mg)] (mg/L)9
Temperature (°C)10
Footnote 10
Grab
Upstream,
Downstream
Fecal Coliform
Footnote 10
Grab
Upstream,
(No colonies/100 mL)10
Downstream
Dissolved Oxygen (mg/L)10
Footnote 10
Grab
Upstream,
Downstream
All footnotes are listed on the following page.
Page 5of17

Permit NCO025534
Footnotes:
1. Submit discharge monitoring reports electronically using NC DWR's eDMR application system. See
Special Condition A (6.).
2. Upstream is in Mud Creek above outfall. Downstream is at NCSR 1365.
3. The monthly average effluent BODS and Total Suspended Solids concentrations shall not exceed
15% of the respective influent value (85% removal).
4. Total Nitrogen = TKN + NO3-N + NO2-N, where TKN is Total Kjeldahl Nitrogen, NO3-N is Nitrate
Nitrogen, and NO2-N is Nitrite Nitrogen.
5. Total Silver samples should be analyzed to the lower detection limit approximately to < 1 µg/L.
6. Effluent Total Hardness sampling should be performed in conjunction with metals sampling.
7. Whole Effluent Toxicity shall be monitored using the Pass/Fail Chronic Toxicity test using
Ceriodaphnia at 21 % effluent. Samples shall be taken in February, May, August & November; see
Special Condition A. (4.).
8. The Permittee shall perform three Effluent Pollutant Scans during the term of this permit; see Special
Condition A. (5.).
9. The Permittee shall sample mstream Total Hardness, upstream of the facility's discharge. The
sample shall be representative of the hardness in .the receiving stream.
10. Samples shall be collected three times per week from June4 through September 30 and once per
week from October 1 through May 31.
b. There shall be no discharge of floating solids or visible foam/ in other than trace amounts
Page 6 of 17

Permit NCO025534
A. (3.) CHRONIC TOXICITY PERMIT LIMIT (Quarterly) — 4.8 MGD [I 5A NCAC 02B 0200
et seq.]
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant
mortality to Ceriodaphnia dubia at an effluent concentration of 18%.
The permit holder shallperform at a minimum, quarterly monitoring using test procedures outlined in
the "North Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised December 2010, or
subsequent versions or "North Carolina Phase Il Chronic Whole Effluent Toxicity Test Procedure"
(Revised- December 2010) or subsequent versions. The tests will be performed during the months of
February, May, August and November. These months signify the first month of each three-month
toxicity testing quarter assigned to the facility Effluent sampling for this testing must be obtained during
representative effluent discharge and shall be performed at the NPDES permitted final effluent discharge
below all treatment processes.
If the test procedure performed as the first test of any single quarter results in a failure or Chronic
Value (ChV) below the permit limit, then multiple -concentration testing shall be performed at a
minimum, in each of the two following months as described in "North Carolina Phase II Chronic
Whole Effluent Toxicity Test Procedure" (Revised -December 2010) or subsequent versions.
All toxicity testing results required as part of this permit condition will be entered on the Effluent
Discharge Monitoring Form (MR -1) for the months in which tests were performed, using the parameter
code TGP313 for the pass/fail results and THP313 for the Chronic Value. Additionally, DWR Form AT -
3 (original) is to be sent to the following address:
Attention* North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh, NC 27699-1621
Completed Aquatic Toxicity Test Forms shall be filed with the Water Sciences Section no later than 30
days after the end of the reporting period for which the report is made
Test data shall be complete, accurate, include all supporting chemical/physical measurements and all
concentration/response data, and be certified by laboratory supervisor and ORC or approved designate
signature. Total Residual Chlorine of the effluent toxicity sample must be measured and reported if
chlorine is employed for disinfection of the waste stream.
Should there be no discharge of flow from the facility during a month in which toxicity monitoring is
required, the permittee will complete the information located at the top of the aquatic toxicity (AT) test
form indicating the facility name, permit number, pipe number, county, and the month/year of the report
with the notation of "No Flow" in the comment area of the form. The report shall be submitted to the
Water Sciences Section at the address cited above
Should the permittee fail to monitor during a month in which toxicity monitoring is required, monitoring
will be required during the following month. Assessment of toxicity compliance is based on the toxicity
testing quarter, which is the three-month time interval that begins on the first day of the month in which
toxicity testing is required by this permit and continues until the final day of the third month.
Page 7 of 17

Permit NC0025534
Should any test data from this monitoring requirement or tests performed by the North Carolina Division
of Water Resources indicate potential impacts to the receiving stream, this permit may be re -opened and
modified to include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control
organism survival, minimum control organism reproduction, and appropriate environmental controls,
shall constitute an invalid test and will require immediate follow-up testing to be completed no later
than the last day of the month following the month of the initial monitoring.
i

Permit NCO025534
A.(4.) CHRONIC TOXICITY PERMIT LIMIT (Quarterly) —upon expansion [15A NCAC 02B
.0200 et seq.]
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant
mortality to Ceriodaphnia dubia at an effluent concentration of 21 %.
The permit holder shall perform at a minimum, quarterly monitoring 'using test procedures outlined in
the "North Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised December 2010, or
subsequent versions or "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure"
(Revised- December 2010) or subsequent versions. The tests will be performed during the months of
February, May, August and November These months signify the first month of each three-month
toxicity testing quarter assigned to the facility. Effluent sampling for this testing must be obtained during
representative effluent discharge and shall be performed at the NPDES permitted final effluent discharge
below all treatment processes.
If the test procedure performed as the first test of,any single quarter results in a failure or Chronic
Value (ChV) below the permit limit, then multiple=`concentration testing shall be performed at a
minimum, in each of the two following months,as described in "North Carolina Phase II Chronic
Whole Effluent Toxicity Test Procedure" (Revised -December 2010) or subsequent versions.
All toxicity testing results required as part of this permit condition will be entered on the Effluent
Discharge Monitoring Form (MR -1) for the months in which,tests were performed, using the parameter
code TGP3B for the pass/fail results and THP3B for the Chronic Value. Additionally, DWR Form AT -
3 (original) is to be sent to the following address:
Attention* North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh, NC 27699-1621
Completed Aquatic Toxicity Test Forms shall be filed with the Water Sciences Section no later than 30
days after the end of the reporting period for which the report is made.
Test data shall be complete, accurate, include all supporting chemical/physical measurements and all
concentration/response data, and be certified by laboratory supervisor and ORC or approved designate
signature. Total Residual Chlorine of the effluent toxicity sample must be measured and reported if
chlorine is employed for disinfection of the waste stream.
Should there be no discharge of flow from the facility during a month in which toxicity monitoring is
required, the permittee will complete the information located at the top of the aquatic toxicity (AT) test
form indicating the facility name, permit number, pipe number, county, and the month/year of the report
with the notation of "No Flow" in the comment area of the form The report shall be submitted to the
Water Sciences Section at the address cited above.
Should the permittee fail to monitor during a month in which toxicity monitoring is required, monitoring
will be required during the following month. Assessment of toxicity compliance is based on the toxicity
testing quarter, which is the three-month time interval that begins on the first day of the month in which
toxicity testing is required by this permit and continues until the final day of the third month.
Page 9 of 17

Permit NCO025534
Should any test data from this monitoring requirement or tests performed by the North Carolina Division
of Water Resources indicate potential impacts to the receiving stream, this permit may be re -opened and
modified to include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control
organism survival, minimum control organism reproduction, and appropriate environmental controls,
shall constitute an invalid test and will require immediate follow-up testing to be completed no later
than the last day of the month following the month of the initial monitoring.
Page 10 of 17
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Page 10 of 17

Permit NCO025534
A.(5.) EFFLUENT POLLUTANT SCAN (Municipal POTWs) [G.S. 143-215.1(b)]
The Permittee shall perform a total of three (3) Effluent Pollutant Scans for all parameters listed below.
One scan must be performed in each of the following years: 2018, 2019, and 2020. Analytical methods
shall be in accordance with 40 CFR Part 136 and shall be sufficiently sensitive to determine whether
parameters are present in concentrations greater than applicable standards and criteria. Samples should be
collected with one quarterly toxicity test each year, and must represent seasonal variation [i.e., do not
sample in the same quarter every year]. Unless otherwise indicated, metals shall be analyzed as "total
recoverable."
Ammonia (as N)
Trans-l,2-dichloroethylene
Bis (2-chloroethyl) ether
Chlorine (total residual, TRC)
1, 1 -dichloroethylene
Bis (2-chloroisopropyl) ether
Dissolved Oxygen
1,2-dichloropropane
Bis (2-ethylhexyl) phthalate
Nitrate/Nitnte
1,3-dichloropropylene
4-bromophenyl phenyl ether
Kjeldahl Nitrogen (TKN)
Ethylbenzene
Butyl benzyl phthalate
Oil and Grease
Methyl brom�ideo�
2-chloronaphthalene
Phosphorus
Methyl chloride
4-chlorophenyl phenyl ether
Total Dissolved Solids
Methylene'chlonde
Chrysene
Hardness
1,1,2,2-tetrachloroethane',,�,
Di -n -butyl phthalate
Antimony
Tetrachloroethylene �� -
Di phthalate
Arsenic
Toluene
Dibenzo(a,h)anthracene
Beryllium
1, 1, 1 -tnchloroethan
1,2 -dichlorobenzene
Cadmium
1,1,2 -trichloroethane
1,3 -dichlorobenzene
Chromium
Trichloroethylene �¢,�
1,4 -dichlorobenzene
Copper
Vinyl chloride.;3,3-dichlorobenzidine
Lead
Acid -extractable compounds:
Diethyl phthalate
Mercury (EPA Method.1631E)
rY P -chloro -m -cresol
Dimethyl phthalate
Nickel
, 2 -chlorophenol
2,4-dmitrotoluene
Selenium
°2,4=dichlorophenol
2,6-dimtrotoluene
Silver "�
2,4 -dimethylphenol
1,2-diphenylhydrazme
Thallium
4,6-dmitr07o7cresol
Fluoranthene
Zinc
r
2,4-dinitrophenol
Fluorene
Cyanide
. 2-rntrophenol
Hexachlorobenzene
Total Phenolic Compounds
4-nitrophenol
Hexachlorobutadiene
Volatile organic compounds:
Pentachlorophenol
Hexachlorocyclo-pentadiene
Acrolem
Phenol
Hexachloroethane
Acrylonitrile
2,4,6 -trichlorophenol
Indeno(1,2,3-cd)pyrene
Benzene
Base -neutral compounds:
Isophorone
Bromoform
Acenaphthene
Naphthalene
Carbon tetrachloride
Acenaphthylene
Nitrobenzene
Chlorobenzene
Anthracene
N-mtrosodi-n-propylamme
Chlorodibromomethane
Benzidine
N-nrtrosodimethylamme
Chloroethane
Benzo(a)anthracene
N-mtrosodiphenylamme
2-chloroethylvmyl ether
Benzo(a)pyrene
Phenanthrene
Chloroform
3,4 benzofluoranthene
Pyrene
Dichlorobromomethane
Benzo(ghi)perylene
1,2,4-tnchlorobenzene
1, 1 -dichloroethane
Benzo(k)fluoranthene
1,2-dichloroethane
Bis (2-chloroethoxy) methane
Page 11 of 17

Permit NCO025534
Reporting. Test results shall be reported on DWR Form -A MR-PPA1 (or in a form approved by the
Director) by December 31St of each des_gnated sampling year. The report shall be submitted to the
following address: NC DEQ / DWR / Central Files, 1617 Mail Service Center, Raleigh, North
Carolina 27699-1617.
Additional Toxicity Testing Requirements for Municipal Permit Renewal. Please note that
Municipal facilities that are subject to the Effluent Pollutant Scan requirements listed above are also
subject to additional toxicity testing requ_rements specified in Federal Regulation 40 CFR 122.210)(5).
The US EPA requires four (4) toxicity tests for a test organism other than the test species currently
required in this permit. The multiple species tests should be conducted either quarterly for a 12 -month
period prior to submittal of the permit renewal application, or four tests performed at least annually in
the four and one half year period prior to the application. These tests shall be performed for acute or
chronic toxicity, whichever is specified in this permit. The multiple species toxicity test results shall be
filed with the Aquatic Toxicology Branch at the following'addre
North Carolina Division of Water Resources'f
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh, North Carolina 27699-1621
Contact the Division's Aquatic Toxicology Branch at 919,-743-8401 for guidance on conducting the
additional toxicity tests and reporting requirements. Results should also be summarized in Part E
(Toxicity Testing Data) of EPA Municipal Application Form 2A, when submitting the permit renewal
application to the NPDES Permitting Unit.
Page 12 of 17

Permit NCO025534
A.(6.) ELECTRONIC REPORTING OF MONITORING REPORTS [G.S. 143-215.1(b)]
Federal regulations require electronic submittal of all discharge monitoring reports (DMRs) and program
reports The final NPDES Electronic Reporting Rule was adopted and became effective on December
21, 2015.
NOTE: This special condition supplements or supersedes the following sections within Part II of this
permit (Standard Conditions for NPDES Permits).
• Section B. (11.) Signatory Requirements
• Section D. (2.) Reporting
• Section D. (6.) Records Retention
• Section E. (5.) Monitoring Reports
1. Reporting Requirements [Supersedes Section D. (2.) and Section E. (5.) (a)]
The permittee shall report discharge monitoring data electronically using the NC DWR's Electronic
Discharge Monitoring Report (eDMR) internet application.
Monitoring results obtained during the previous month(s) shall be summarized for each month and
submitted electronically using eDMR. The eDMR system allows permitted facilities to enter
monitoring data and submit DMRs electronically using the internet Until such time that the state's
eDMR application is compliant with EPA's Cross -Media Electronic Reporting Regulation
(CROMERR), permittees will be required to submit all discharge monitoring data to the state
electronically using eDMR and will be required to complete the eDMR submission by printing,
signing, and submitting one signed original and a copy of the computer printed eDMR to the
following address -
NC DEQ / Division of Water Resources / Water Quality Permitting Section
ATTENTION: Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
If a permittee is unable to use the eDMR system due to a demonstrated hardship or due to the facility
being physically located in an area where less than 10 percent of the households have broadband
access, then a temporary waiver from the NPDES electronic reporting requirements may be granted
and discharge monitoring data may be submitted on paper DMR forms (MR 1, 1 1, 2, 3) or alternative
forms approved by the Director. Duplicate signed copies shall be submitted to the mailing address
above. See "How to Request a Waiver from Electronic Reporting" section below.
Regardless of the submission method, the first DMR is due on the last day of the month following
the issuance of the permit or in the case of anew facility, on the last day of the month following the
commencement of discharge.
Starting on December 21, 2020, the permittee must electronically report the following compliance
monitoring data and reports, when applicable -
Page 13 of 17

Permit NCO025534
Sewer Overflow/Bypass Event Reports;
Pretreatment Program Annual Reports; and
Clean Water Act (CWA) Section 316(b) Annual Reports.
The permittee may seek an electronic reporting waiver from the Division (see "How to Request a
Waiver from Electronic Reporting" section below).
2. Electronic Submissions
In accordance with 40 CFR 122.41(1)(9), the permittee must identify the initial recipient at the time
of each electronic submission. The permittee should use the EPA's website resources to identify the
initial recipient for the electronic submission.
Initial recipient of electronic NPDES information from NPDES-regulated facilities means the entity
(EPA or the state authorized by EPA to implement the NPDES program) that is the designated entity
for receiving electronic NPDES data [see 40 CER 127.2(b)].
EPA plans to establish a website that will also link to the appropriate electronic reporting tool for
each type of electronic submission and for each state. Instructions on how to access and use the
appropriate electronic reporting tool will be available as well. Information on EPA's NPDES
Electronic Reporting Rule is found at:
https://www.federaIregister.gov/documents/2015/10/22/2015-24954/national-pollutant-
discharge-elimination-system-npdes-electronic-reporting-rule.
Electronic submissions must start by the dates listed in the "Reporting Requirements" section above.
3. How to Request a Waiver from Electronic Reporting
The permittee may seek a temporary electronic reporting waiver from the Division. To obtain an
electronic reporting waiver, a permittee must first submit an electronic reporting waiver request to
the Division. Requests for temporary electronic reporting waivers must be submitted in writing to
the Division for written approval at least sixty (60) days prior to the date the facility would be
required under this permit to begin submitting monitoring data and reports. The duration of a
temporary waiver shall not exceed five (5) years and shall thereupon expire. At such time,
monitoring data and reports shall be submitted electronically to the Division unless the Permittee re-
applies for and is granted a new temporary electronic reporting waiver by the Division. Approved
electronic reporting waivers are not transferrable. Only permittees with an approved reporting
waiver request may submit monitoring data and reports on paper to the Division for the period that
the approved reporting waiver request is effective.
Information on eDMR and the application for a temporary electronic reporting waiver are found on
the following web page:
http://deq.nc gov/about/divisions/water-resources/edmr
Page 14 of 17

Permit NC0025534
4. Simatory Requirements [Supplements Section B. (11.) (b) and Supersedes Section B. (11.) (d)1
All eDMRs submitted to the permit issuing authority shall be signed by a person described in Part
II, Section B. (11.)(a) or by a duly authorized representative of that person as described in Part II,
Section B. (11.)(b). A person, and not a position, must be delegated signatory authority for eDMR
reporting purposes.
For eDMR submissions, the person signing and submitting the DMR must obtain an eDMR user
account and login credentials to access the eDMR system. For more information on North Carolina's
eDMR system, registering for eDMR and obtaining an eDMR user account, please visit the following
web page:
http://deg.nc.gov/about/divisions/water-resources/edmr
Certification. Any person submitting an electronic DMR using the state's eDMR system shall make
the following certification [40 CFR 122.22]. NO OTHER STATEMENTS OF CERTIFICATION
WILL BE ACCEPTED:
"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 fines and imprisonment for knowing violations. "
5. Records Retention [Supplements Section D. (6.)]
The permittee shall retain records of all Discharge Monitonng Reports, including eDMR
submissions. These records or copies shall be maintained for a period of at least three (3) years from
the date of the report. This period may be extended by request of the Director at any time [40 CFR
122.41].
Page 15 of 17

Permit NCO025534
A. (7.) MERCURY MINIMIZATIOl! PLAN (MMP) [G.S. 143-215.1 (b)]
The permittee shall develop and implement a Mercury Minimization Plan (MMP) during this permit
term. The MMP shall be developed within 180 days of the NPDES Permit Effective Date, and shall be
available for inspection on-site. A sample MMP was developed through a stakeholder review process
and has been placed on the Division website for guidance (http://deg.nc.gov/about/divisions/water-
resources/water-resources-permits/wastewater-branch/npdes-wastewater-permits, under
Model Mercury Minimization Plan). nae MMP should place emphasis on identification of mercury
contributors and goals for reduction. Results shall be summarized and submitted with the next permit
renewal. Performance of the Mercury Minimization Plan will meet the requirements of the TMDL (Total
Maximum Daily Load) for mercury approved by USEPA on October 12, 2012, unless and until a Waste
Load Allocation specific to this facility is developed and this NPDES permit is amended to require
further actions to address the Waste Load Allocation.
Page 16 of 17

Permit NCO021709
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Fact Sheet
NPDES Permit No. NCOO25534
Permit Wnter/Email Contact Gary Perlmutter, [e-mail]
Date- Month xx, 2017
Division/Branch- NC Division of Water Resources/NPDES Complex Permitting
Fact Sheet Template- Version 09Jan2017
Perrnttmg Action:
® Renewal
❑ Renewal with Expansion
❑ New Discharge
❑ Modification (Fact Sheet should be tailored to mod request)
Note A complete application should include the following-
• For New Dischargers, EPA Form 2A or 21) requirements, Engineering Alternatives Analysis, Fee
• For Existing Dischargers (POTW), EPA Form 2A, 3 effluent pollutant scans, 4 2" d species WET
tests.
• For Existing Dischargers (Non-POTW), EPA Form 2C with correct analytical requirements based
on industry category.
Complete applicable sections below. If not applicable, enter NA
1. Basic Facility Information
Facility Information
Applicant/Facility Name:
City of Hendersonville WWTP
Applicant Address:
305 Williams Street, Hendersonville, NC 28792
Facility Address:
99 Balfour Road Hendersonville, NC 28792
Permitted Flow:
Phased 4.8 and 6.0 MGD
Facility Type/Waste:
MAJOR Municipal; 95% domestic, 5% industrial
Facility Class:
Class 4
Treatment Units:
Bar Screen, Gravity Thickener, Belt Press, Aerated Grit Removal,
Activated Sludge, Clanfication, Low Head Filters, UV disinfection,
Cascade Aeration
Pretreatment Program (Y/1)
Yes
County:
Henderson
Region
Asheville
Briefly describe the proposed permitting action and facility background The City of Hendersonville has
applied for NPDES permit renewal, and submitted a renewal application dated June 17, 2015 This
facility serves a population of 19,800 residents and operates a pretreatment program with 1 Significant
Industrial User (SIU) and 2 Categorical Industrial Users (ClUs)
Page 1 of 11

2. Receiving Waterbody Information:
Receiving Waterbody Information
Outfalls/Receiving Stream(s):
Outfall 001 -Mud Creek
Stream Segment:
6-55
Stream Classification:
C
Drainage Area (mi2):
98
Summer 7Q10 (cfs)
34.9
Winter 7Q10 (cfs).
46.8
30Q2 (cfs):
69.5
Average Flow (cfs):
186
IWC (% effluent):
17.6 and 21.1.
303(d) listed/parameter:
This segment is listed as impaired for Benthos and Fish
Community on the Final 2014 and Draft 2016 303(d) lists.
Subject to TMDL/parameter:
Statewide TMDL for Mercury
Subbasin/HUC:
04-03-02; 0601Q105 Upper French Broad
USGS Topo Quad-
F9SW/Hendersonville, NC
3. Effluent Data Summary
Effluent data is summarized below for the period January 2013 through February 2017.
Table. Effluent Data Summary
Parameter
Units
Average
Max
Min
Limit'
Flow
MGD
3.10
9.99
1.99
4.80
BODS summer
mg/L
4.3
17.5
< 2
MA = 10 0
WA= 15 0
BODS winter
mg/L
45
15.5
< 2
MA = 20 0
WA = 30.0
BOD removal
° 0
97.3
NA
NA
> 85
Total Suspended Solids
MA = 30.0
(TSS)
mg'L
4.2
28 8
< 2.5
WA = 45.0
TSS removal
%
98.5
NA
NA
> 85
NH3N summer
mg/L
0.54
6.90
< 0 50
MA = 2 0
WA = 6.0
NH3N winter
mg/L
0.55
4.40
< 0.50
MA -40
WA = 12.0
Dissolved Oxygen (DO)
mg/L
7.3
9.8
5.0
> 5.0
Page 2 of 11

Fecal Coliform
#/100 mL
65
600
< I
MA = 200
(geometric mean)
WA = 400
Total Residual Chlorine
µg/L
NA
NA'
NA'
DM = 28
(TRC)
Temperature
°C
176
25.1
6.0
Monitor
only
pH
SU
68
7.3
59
6-9
Total Nitrogen
mg/L
955
19 10
430
Monitor
only
Total Phosphorus
mg/L
270
4.40
1 10
Monitor
only
Chronic Toxicity
Ceraodaphnaa
pass
pass
pass
Pass
Monitor
Bis(2-ethylhexyl)phthalate
µg/L
< 5
< 5
<5
only
Total Copper
µg/L
15.8
86.0
7.0
Monitor
only
Total Zinc
µg/L
472
853
004
Monitor
only
Total Nickel
µg/L
113
1070
<5 0
MA = 142
WA = 1268
'MA -Monthly Average, WA -Weekly Average, DM -Daily Maximum
'Facility is using UV for disinfection, not chlorine a
4. Instream Data Summary
Instream monitoring may be required in certain situations, for example 1) to verify model predictions
when model results for instream DO are within 1 mg/L of instream standard at full permitted flow, 2) to
verify model predictions for outfall diffuser; 3) to provide data for future TMDL, 4) based on other
instream concerns. Instream monitoring may be conducted by the Permittee, and there are also
Monitoring Coalitions established in several basins that conduct instream sampling for the Permittee (in
which case mstream monitoring is waived in the permit as long as coalition membership is maintained)
If applicable, summarize any instream data and what instream monitoring will be proposed for this
permit action The current permit requires instream monitoring for DO, Fecal Coliform and Temperature
Review of instream data from February 2014 through February 2017 yielded an average upstream to
downstream DO increase of 0 4 mg/L, which tested significant (t-test, p = 0 01), indicating that oxygen -
consuming wastes in the effluent are not causing the receiving water DO to decrease Temperature did not
significantly change between upstream and downstream (mean difference was 0 2 °C, t-test resulted in p
> 0 10), likewise indicating that the effluent is not affecting the receiving water thermally Fecal Coliform
values varied greatly, with an average decrease of 6 colonies/100 mL from upstream to downstream
Instream fecal coliform counts were often above the effluent standard of 200/100 mL monthly average,
both upstream and downstream of the plant with 198 and 121 days, respectively (264 total days
examined) Overall, the data suggest that the POTW is not impacting the water quality of Mud Creek
sufficiently to require an alteration in instream monitoring Therefore, it is recommended that instream
monitoring be continued at the existing frequency
Page 3 of 11

Is this facility a member of a Monitoring Coalition with waived instream monitoring (YIN) NO
Name ofMonitorzng Coalition NA
5. Compliance Summary
Summarize the compliance record with permit effluent limits (past 5 years). The facility reported one
limit violation in the past five years. A pH of 5 9 (limit: 6-9) was reported on January 9, 2017. No action
was taken
Summarize the compliance record with aquatic toxicity test limits and any second species test results
(past 5 years): The facility passed 19 of 19 quarterly chrome Ceriodaphnia dubia toxicity tests, as well
as all 4 second species (Fathead Minnow) chronic toxicity test; sampled on 11/06/2016, 12/4/2016,
01/03/2017 and 02/12/2017.
Summarize the results from the most recent compliance inspection The most recent facility inspection
was conducted on February 22, 2017 The inspector reported that the facility appeared to be well
maintained and operated, and m compliance with its permit.
6. Water Quality -Based Effluent Limitations (WQBELs)
Dilution and Mixing Zones
In accordance with 15A NCAC 2B.0206, the following streamflows are used for dilution considerations
for development of WQBELs: 1Q10 streamflow (acute Aquatic Life); 7Q10 streamflow (chronic Aquatic
Life, non -carcinogen HH), 30Q2 streamflow (aesthetic); annual average flow (carcinogen, HH).
If applicable, describe any other dilution factors considered (e g, based on CORMLXmodel results) NA
If applicable, describe any mixing zones established in accordance with 15A NCAC 2B 0204(b)' NA
Oxygen -Consuming Waste Limitations
Limitations for oxygen -consuming waste (e.g., BOD) are generally based on water quality modeling to
ensure protection of the instream ,dissolved oxygen (DO) water quality standard Secondary TBEL limits
(e g, BOD= 30 mg/L for Municipals) may be appropriate if deemed more stringent based on dilution and
model results.
Ifpermat limits are more stringent than TBELs, describe how limits were developed Limitations for
BOD are based on a Streeter Phelps model (Level B) for mstream DO protection. No changes are
proposed from the previous permit limits
Ammonia and Total Residual Chlorine Limitations
Limitations for ammonia are based on protection of aquatic life utilizing an ammonia chronic criterion of
1.0 mg/L (summer) and 1 8 mg/L (winter). Acute ammonia limits are derived from chronic criteria,
utilizing a multiplication factor of 3 for Municipals and a multiplication factor of 5 for Non-Mumcipals
Limitations for Total Residual Chlorine (TRC) are based on the NC water quality standard for protection
of aquatic life (17 ug/1) and capped at 28 ug/l (acute impacts). Due to analytical issues, all TRC values
reported below 50 ug/l are considered compliant with their permit limit.
Page 4 of 11

Describe any proposed changes to ammonia and/or TRC limits for this permit renewal The facility does
not chlorinate, therefore the current TRC limit and monitoring requirement will be removed from the
permit The current NH3-N limits (originally set as oxygen -consuming limits) are more stringent than
those calculated using the WLA spreadsheet
Reasonable Potential Analysis (RPA) for Toxicants
If applicable, conduct RPA analysis and complete information below
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 1/2 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 cntena in the RPA process in accordance with guidance titled NPDES Implementation of
Instream Dissolved Metals Standards, dated June 10, 2016.
A reasonable potential analysis was conducted on effluent toxicant data collected between January 2013
and January 2017. Pollutants of concern included toxicants with positive detections and associated water
quality standards/critena. Based on this analysis, the following permitting actions are proposed for this
permit
• Effluent Limit with Monitoring. The following parameters will receive a water quality -based
effluent limit (WQBEL) since they demonstrated a reasonable potential to exceed applicable
water quality standards/cntena Copper at 6.0 MGD permitted flow
• Monitoring Only The following parameters will receive a monitor -only requirement since they
did not demonstrate reasonable potential to exceed applicable water quality standards/cntena,
but the maximum predicted concentration was > 50% of the allowable concentration- Copper (at
4.8 MGD only), Nickel and Silver All silver effluent samples were reported as non -detects at <
5 µg/L Since the allowable discharge concentration is < 1 µg/L, monitoring is recommended at
a lower detection level of < 1 µg/L.
• No Limit or Monitorm : The following parameters will not receive a limit or monitoring, since
they did not demonstrate reasonable potential to exceed applicable water quality
standards/cntena and the maximum predicted concentration was < 50% of the allowable
concentration Arsenic, Beryllium, Cadmium, Total Phenolic Compounds, Total Chromium,
Cyanide, Lead, Selenium, Zinc
• POTW Effluent Pollutant Scan Review Three effluent pollutant scans were evaluated for
additional pollutants of concern
o The following parameter(s) will receive a water quality -based effluent limit (WQBEL)
with monitoring, since as part of a limited data set, two samples exceeded the allowable
discharge concentration None
o The following parameter(s) will receive a monitor -only requirement, since as part of a
limited data set, one sample exceeded the allowable discharge concentration None
If applicable, attach a spreadsheet of the RPA results as well as a copy of the Dissolved Metals
Implementation Fact Sheet for fi-eshwater/saltwater to this Fact Sheet Include a printout of the RPA
Dissolved to Total Metal Calculator sheet of this is a Municipality with a Pretreatment Program
Toxicity Testing Limitations
Permit limits and monitoring requirements for Whole Effluent Toxicity (WET) have been established in
accordance with Division guidance (per WET Memo, 8/2/1999) Per WET guidance, all'NPDES permits
Page 5 of 11

issued to Mayor facilities or any facility discharging "complex" wastewater (contains anything other than
domestic waste) will contain appropriate WET limits and monitoring requirements, with several
exceptions. The State has received prior EPA approval to use an Alternative WET Test Procedure in
NPDES permits, using single concentration screening tests, with multiple dilution follow-up upon a test
failure
Describe proposed toxicity test requirement Hendersonville WWTP is a Mayor POTW with chronic
WET limits of 18% effluent at 4 8 MGD and 21 % at 6 0 MGD upon expansion No changes are proposed.
Mercury Statewide TMDL Evaluation
There is a statewide TMDL for mercury approved by EPA in 2012 /The TMDL target was to comply
with EPA's mercury fish tissue criteria (C 3 mg/kg) for human health protection The TMDL established a
wasteload allocation for point sources of 37 kg/year (81 lb/year), aifd is applicable to municipals and
industrial facilities with known mercury discharges Given�he small contribution of mercury from point
sources (^-2% of total load), the TMDL emphasizes mercury minimization plans (MMPs) for point source
control Municipal facilities > 2 MGD and discharging quantifiable levels of mercury (> 1 ng/L) will
receive an MMP requirement Industrials are evaluated on a case-by-case basis, depending if mercury is a
pollutant of concern Effluent limits may also be added if annual average effluent concentrations exceed
the WQBEL value (based on the NC WQS of 12 ng/L) and/or if any individual value exceeds a TBEL
value of 47 ng/L
Table Mercury Effluent Data Summary
Parameter
2012
2013
2014
2015 1 2016
No of Samples
5
4
4
5 3
Annual Average Conc. ng/L
1.6
1 0
6.1
23 2 1
Maximum Conc , ng/L
2:32
1.38
20.50
410 307
TBEL, ng/L
47
WQBEL, ng/L
683
Describe proposed permit actions based on mercury evaluation Since no annual average mercury
concentration exceeded, the WQBEL, and no individual mercury sample exceeded the TBEL, no mercury
limit is required. However, since the facility is > 2 MGD and reported quantifiable levels of mercury (> 1
ng/L), a Mercury Minimization Plan ((-MMP) has been added to the permit
Other TMDL/Nutnent Management Strategy Considerations
If applicable, describe any other TMDLs/Nutrient Management Strategies and their implementation
within this permit• The French Broad River Basin has no TMDLs, nor does it have a Nutrient
Management Strategy. Total Nitrogen and Total Phosphorus is monitored quarterly per facility size (> 1
MGD) and river sub -basin (French Broad) as specified in 15A NCAC 02B 0508 No changes are
proposed.
Other WQBEL Considerations
If applicable, describe any other parameters of concern evaluated for WQBELs The current permit
requires quarterly monitoring of Bis{2-ethylhexyl)phthalate, based on detects in prior Effluent Scans All
Page 6 of 11

data under the current permit were below detection at 5 µg/L, the Permittee requested this be removed
from the permit 'Review of the data revealed that continued monitoring is no longer necessary, quarterly
monitoring of Bis(2-ethylhexyl)phthalate is proposed for removal
If applicable, describe any special actions (HQW or OR W) this receiving stream and classification shall
comply with in order to protect the designated waterbody NA
If applicable, describe any compliance schedules proposed for this permit renewal in accordance with
15A NCAC 2H 0107(c)(2)(B), 40CFR 122 47, and EPA May 2007 Memo NA
If applicable, describe any water quality standards variances proposed in accordance with NCGS 143-
215 3(e) and 15A NCAC 2B 0226 for this permit renewal NA
7. Technology -Based Effluent Limitations (TBELs)
Municipals if not applicable, delete and skip to Industrials)
Are concentration limits in the permit at least as stringent as secondary treatment requirements (30 mg/L
BODS/TSS for Monthly Average, and 45 mg/L for BODS/TSS for Weekly Average). YES
If NO, provide ajustification for alternative limitations (e.g, waste stabilization pond). NA
Are 85% removal requirements for BODS/TSS included in the permit? YES
If NO, provide alust f cation (e g, waste stabilization pond) NA
Industrials (if not applicable, delete and slap to next Section) NA
8. Antidegradation Review (New/Expanding Discharge)
The objective of an antidegradation review is to ensure that a new or increased pollutant loading will not
degrade water quality Permitting actions for new or expanding discharges require an antidegradation
review in accordance with 15A NCAC 2B.0201 Each applicant for a new/expanding NPDES permit
must document an effort to consider non -discharge alternatives per 15A NCAC 2H.0105(c)(2) Ina]]
cases, existing instream water uses and the level of water quality necessary to protect the existing use is
maintained and protected
If applicable, describe the results of the antidegradation review, including the Engineering Alternatives
Analysis (EAA) and any water quality modeling results NA
9. Antibacksliding Review -
Sections 402(0)(2) and 303(d)(4) of the CWA and federal regulations at 40 CFR 122.44(1) prohibit
backsliding of effluent limitations in NPDES permits These provisions require effluent limitations an a
reissued permit to be as stringent as those in the previous permit, with some exceptions where limitations
may be relaxed (e g , based on new information, increases in production may warrant less stringent TBEL
limits, or WQBELs may be less stringent based on updated RPA or dilution)
Are any effluent limitations less stringent than previous permit (YES/NO) NO
Page 7 of 11

If YES, confirm that antibacksliding provisions are not violated • NA
10. Monitoring Requirements
Monitoring frequencies for NPDES permitting are established in accordance with the following
regulations and guidance 1) State Regulation for Surface Water Monitoring, 15A NCAC 2B.0500, 2)
NPDES Guidance, Monitoring Frequency for Toxic Substances (7/15/2010 Memo), 3) NPDES Guidance,
Reduced Monitoring Frequencies for Facilities with Superior Compliance (10/22/2012 Memo); 4) Best
Professional Judgement (BPJ). Per US EPA (Interim Guidance, 1996), monitoring requirements are not
considered effluent limitations under Section 402(0) of the Clean Water Act, and therefore anti -
backsliding prohibitions would not be triggered by reductions in monitoring frequencies
For mstream monitoring, refer to Section 4
11. Electronic Reporting Requirements
The US EPA NPDES Electronic Reporting Rule was finalized on December 21, 2015. Effective
December 21, 2016, NPDES regulated facilities are required,to submit Discharge Monitoring Reports
(DMRs) electronically Effective December 21, 2020, NPDES regulated facilities will be required to
submit additional NPDES reports electronically. This permit contains the requirements for electronic
reporting, consistent with Federal requirements
12. Summary of Proposed Permitting Actions
Table 1 Current Permit Conditions and Proposed Changes until expansion above 4 8 MGD
Parameter
Current Permit
Proposed Change
Basis for Condition/Change
Flow
MA 4.8 MGD
No change
15A NCAC 2B 0505.
Summer:
MA 10 mg/L
WQBEL. Based on protection of
BODS
WA 15 mg/L
No change
DO standard 15A NCAC 2B.0200,
Winter-
assigned upon facility expansion of
MA 20 mg/L
4.8 MGD in 2002.
WA 30 mg/L
Total Suspended Solids
MA 30 mg/L
TBEL Secondary treatment
(TSS)
WA 45 mg/L
No change
standards/40 CFR 133 / 15A NCAC
2B 0406
Summer.
MA 2 mg/L
WA 6 mg/L
WQBEL. 40 CFR 122 45, set as
NH3-N
Winter:
No change
modification in permit renewal,
MA 4 mg/L
April 19, 2006
WA 12 mg/L
Dissolved Oxygen (DO)
> 5 mg/L
No change
WQBEL State WQ standard, 15A
NCAC 2B.0200.
Page 8 of 11

Fecal Coliform
MA 200 /100 mL
No change
WQBEL. State WQ standard, 15A
(geometric mean)
WA 400 /100 mL
NCAC 2B.0200
Total Residual Chlorine
DM 28 µg2
Remove from
Facility does not chlorinate.
(TRC)
monitoring
Temperature
Monitor daily
No Change
WQBEL. State WQ standard, 15A
NCAC 2B .0500
WQBEL. State WQ standard, 15A
pH
6-9 SU
No change
NCAC 2B.0200.
Total Nitrogen
Monitor
No change
15A NCAC 02B.0508.
(NO2 + NO3 + TKN)
quarterly
Total Phosphorus
Monitor
quarterly
No change
15A NCAC 02B.0508.
Ceriodaphnia
.WQBEL. No toxics in toxic
Chronic Toxicity
pass/fail at 18%
No change
amounts. 15A NCAC 2B.0200 and
effluent
15A NCAC 2B.0500.
Bis(2-ethylhexyl)phthalate
Monitor
Remove from
No detects at 5 µg2 in DMR data
quarterly
monitoring
Hardness -dependent dissolved
metals water quality standards,
Total Hardness
No requirement
Monitor quarterly
approved in 2016, need effluent and
instream hardness data for
calculations of permit limitations.
No reasonable potential found;
Total Copper
Monitor
quarterly
quarterly
No change
predicted maximum >50% of
allowable Cw
No reasonable potential found;
Total Nickel
Monitor
quarterly
No change
predicted maximum >50% of
allowable Cw.
v
Add quarterly
No detects at 5 µg/L, higher than
Total Silver
No requirement
monitoring at lower
allowable Cw.
PQL
Monitor
Remove from
No reasonable potential found,
Total Zinc
quarterly
monitoring
predicted maximum < 50% of
allowable Cw.
WQBEL. In accordance with 2012
Mercury Minimization
No requirement
Add MMP Special
Statewide Mercury TMDL
Plan (MMP)
Condition
Implementation, per facility size and
monitoring data criteria.
Reduce to three
Effluent Pollutant Scan
Annual
times per permit
40 CFR 122
cycle
Add Electronic
In accordance with EPA Electronic
Electronic Reporting
No requirement
Reporting Special
Reporting Rule 2015.
Condition
MGD — Million gallons per day, MA - Monthly Average, WA — Weekly Average, DM — Daily Max
Page 9 of 11

Table 2. Current Permit Conditions and Proposed Changes upon expansion above 4.8 MGD.
Parameter
Current Permit
Proposed Change
Basis for Condition/Change
Flow
MA 6 0 MGD
No change
15A NCAC 2B.0505
Summer.
MA 10 mg/L
WA 15 mg/L
WQBEL. Based on protection of
BODS
Winter
No change
DO standard 15A NCAC 2B.0200.
MA 20 mg/L
WA 30 mg/L
Total Suspended Solids
MA 30 mg/L
TBEL. Secondary treatment
(TSS)
WA 45 mg/L
No change If
standards/40 CFR 133 / 15A NCAC
2B .0406
Summer
MA 2 mg/L
W 6 mg/L
WQBEL 40 CFR 122.45, set as
NH3-N
Winter.
No change
modification in permit renewal,
MA 4 mg/L
Apnl 19, 2006
WA 12 mg/L
Dissolved Oxygen (DO)
> 5 mg/L
No change
WQBEL State WQ standard, 15A
NCAC 2B 0200.
Fecal Coliform
MA 200 /100 mL
No change
WQBEL State WQ standard, 15A
(geometric mean)
WA 400 /100 mL
NCAC 2B 0200
Total Residual Chlorine
DM 28 µg2
Remove from
Facility does not chlorinate.
(TRC)
momtonng
Temperature
Monitor daily
No Change
WQBEL State WQ standard, 15A
NCAC 2B.0500
pH
6-9 SU
No change
WQBEL State WQ standard, 15A
NCAC 2B .0200.
Total Nitrogen
(NO2 + NO3 + TKN)
Monitor quarterly
No change
15A NCAC 02B 0508
Total Phosphorus
Monitor quarterly
No change
15A NCAC 02B .0508
Ceriodaphnia
WQBEL No toxics in toxic
Chronic Toxicity
pass/fail at 21 %
No change
amounts 15A NCAC 2B 0200 and
effluent
15A NCAC 2B 0500
Bis(2-ethylhexyl)phthalate
Monitor quarterly
Remove from
No detects at 5 gg/L in DMR data
momtonng
Hardness -dependent dissolved
Total Hardness
No requirement
Monitor quarterly
metals water quality standards,
approved in 2016, need effluent and
Page 10 of 11

MGD — Million gallons per day, MA - Monthly Average, WA — Weekly Average, DM — Daily Max
13. Fact Sheet Addendum (if applicable):
Were there any changes made since the Draft Permit was public noticed (Yes/No) NO
If Yes, list changes and their basis below • NA
14. Fact Sheet Attachments (if applicable):
• NPDES Aquifer Protection Permitting Unit Pretreatment Information Request Form
• Draft 2016 Category 5 Assessments EPA Submittal — 303(d) List, page 44
• Final 2014 NC 303(d) list, page 31
• Instream Monitoring summary tables and charts
• Removal Rate Calculations
• Monitoring Reports: violations
• WET Testing and Self Monitoring Summary, page 53
• Compliance Evaluation report, 2/22/2017
• NH3/TRC WLA Calculations sheet
• RPA Spreadsheet Summary for current 4.8 MGD and 6 0 MGD expansion
• Dissolved Metals Implementation/Freshwater
• Mercury Data Statistics sheet
Page 11 of 11
mstream hardness data for
calculations of permit limitations.
Total Copper
Monitor quarterly
MA = 37.5 µg/L
WA = 42.8 gg/L
Reasonable potential found.
No reasonable potential found;
Total Nickel
Monitor quarterly
No change
predicted maximum > 50% of
allowable Cw.
Add quarterly
No detects at 5hi her than
µms' g
Total Silver
No requirement
monitoring at lower
allowable Cw.
limit
Remove from
No reasonable potential found;
Total Zinc
Monitor quarterly
predicted maximum < 50% of
monitoring
allowable Cw
WQBEL. In accordance with 2012
Mercury Minimization
No requirement
Add MMP Special
Statewide Mercury TMDL
Plan (MMP)
Condition
Implementation, per facility size and
monitoring data criteria.
Reduce to three
Effluent Pollutant Scan
Annual
times per permit
40 CFR 122
cycle
Add Electronic
In accordance with EPA Electronic
Electronic Reporting
No requirement
Reporting Special
Reporting Rule 2015.
Condition
MGD — Million gallons per day, MA - Monthly Average, WA — Weekly Average, DM — Daily Max
13. Fact Sheet Addendum (if applicable):
Were there any changes made since the Draft Permit was public noticed (Yes/No) NO
If Yes, list changes and their basis below • NA
14. Fact Sheet Attachments (if applicable):
• NPDES Aquifer Protection Permitting Unit Pretreatment Information Request Form
• Draft 2016 Category 5 Assessments EPA Submittal — 303(d) List, page 44
• Final 2014 NC 303(d) list, page 31
• Instream Monitoring summary tables and charts
• Removal Rate Calculations
• Monitoring Reports: violations
• WET Testing and Self Monitoring Summary, page 53
• Compliance Evaluation report, 2/22/2017
• NH3/TRC WLA Calculations sheet
• RPA Spreadsheet Summary for current 4.8 MGD and 6 0 MGD expansion
• Dissolved Metals Implementation/Freshwater
• Mercury Data Statistics sheet
Page 11 of 11