NC0021474_Modification_20170322

Water Resources
ENVIRONMENTAL QUALITY
March 22, 2017
Mr. Dennis J. Hodge
Wastewater Director
City of Mebane
106 E. Washington Street
Mebane, North Carolina 27302
1t1e,Dfs oo P y
ROY COOPER
6oavu",
MICHAEL S. REGAN
:Tenn¢ Secrelm'I
S. JAY ZIMMERMAN
Dh,aor
Subject: Permit Monitoring Modification
Permit No. NCO021474
Mebane WWTP
Alamance County
Facility Class IV
Dear Mr. Hodge:
Division personnel have reviewed and approved your application for a minor
modification of the subject permit. We are forwarding you the new Section A.(1.)
Effluent Limitations and Monitoring Requirements page with footnotes. You should
replace your existing Effluent Limitations and Monitoring Requirements sheet with this
revised page, effective 4/1/2017. This permit revision is issued pursuant to the
requirements of North Carolina General Statute 143-215.1 and the Memorandum of
Agreement between North Carolina and the U.S. Environmental Protection Agency dated
October 15, 2007 (or as subsequently amended).
DWR guidance regarding the reduction of monitoring frequencies in permits for
exceptionally performing facilities is for NPDES permits only and do not apply to
reclaimed water permits. Please contact Jon Risgaard in the Non -Discharge Permitting
Unit if you are interested in obtaining similar monitoring frequency reductions related to
reclaimed water use.
The changes made in this permit modification include:
• Monitoring frequency reductions for BOD and Fecal Coliform from daily to twice
per week, and added footnote #4 to all parameters being monitored twice per
week.
If any parts, measurement frequencies or sampling requirements contained in this permit are
unacceptable to you, you have the right to an adjudicatory hearing upon written request within
thirty (30) days following receipt of this letter. This request must be in the form of a written
petition, conforming to Chapter 150B of the North Carolina General Statutes, and filed with the
State of North Carolina I Environmental Quality I Water Resources
1617 Mail service Center J Raleigh, North Carolina 27699-1617
919 707 9000

Office of Administrative Hearings (6714 Mail Service Center, Raleigh, North Carolina 27699-
6714). Unless such demand is made, this decision shall be final and binding.
Please note that this permit is not transferable except after notice to the Division. The Division
may require modification or revocation and reissuance of the permit. This permit does not affect
the legal requirements to obtain other permits which may be required by the Division of Water
Resources or permits required by the Division of Land Resources, the Coastal Area Management
Act or any other Federal or Local governmental permit that may be required.
If you have any questions concerning this permit, please contact Gary Perlmutter, Environmental
Senior Specialist by e-mail (Qarv.nerlmutter(c),ncderingov) or phone at 919-807-6385.
Sincerely,
. ay Zi �ea
1 ector, Division ofWater Resources
Enclosure: NPDES Permit NC0021474 (Modified pages)
cc: NPDES Unit
Central Files
Winston-Salem Regional Office/Water Quality Operations
e-copy:

PART I
A.(1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
(a.) During the period beginning on the effective date of this permit 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:
EFFLUENT
CHARACTERISTICS
EFFLUENT LIMITATIONS
MONITORING REQUIREMENTS
Monthly
Average
Weekly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample Location
Flow
2.5 MGD
Continuous
Recording
Influent or Effluent
Total Monthly Flow (MG)
Monitor & Report
Monthly
Rec. or Calc.
Influent or Effluent
BOD, 5 day, 200C
(April 1- October 31) 3
5.0 mg/L
7.5 mg/L
Twice per week °
Composite
Influent & Effluent
BOD, 5 day, 200C (November
1 - March 31)
10.0 mg/L
15.0 mg/L
Twice per week ^
Composite
Influent &Effluent
Total Suspended Solids 3
30.0 mg/L
45.0 mg/L
Twice per week 4
Composite
Influent & Effluent
NH3 as N
(April 1 -October 31)
2.0 m /L
g
6.0 m /L
9
Twice per week
Composite
Effluent
NH3 as N
(November 1 -March 31)
4.0 mg/L
12.0 mg/L
Twice per week 4
Composite
Effluent
Dissolved Oxygen 5
Daily
Grab
Effluent
pH 6
Daily
Grab
Effluent
Temperature (°C)
Daily
Grab
Effluent
Fecal nic rm
m
(geometric mean)
200/100ml-
400/100 ml-
Twice Per week 4
Grab
Effluent
Total Residual Chlorine 7
17 pg/L
Daily
Grab
Effluent
Conductivity (pmhos/cm)
Daily
Grab
Effluent
TKN
Monitor & Report (mg/L)
Weekly
Composite
Effluent
NO3-N + NO2-N
Monitor & Report (mg/L)
Weekly
Composite
Effluent
Total Nitrogen, (TN) a
Monitor & Report (mg/L)
Weekly
Composite
Effluent
TN Load 9,10
Monitor & Report (lb/mo) [QM600]
40 225 Ib r ," Y600
Monthly
Annually
Calculated
Effluent
Total Phosphorus, (TP)
Monitor & Report (mg/L)
Weekly
Composite
Effluent
TP Load 9•10
Monitor & Report (lb/mo) [QM665]
5,05 Ib/ r Y665
Monthly
Annually
Calculated
Effluent
Total Zinc 12
Quarterly
Composite
Effluent
Chronic Toxicity 13
Quarterly
Composite
Effluent
Effluent Pollutant Scan 34
Monitor & Report
Footnote 14
Footnote 14
Effluent
All footnotes are listed on the following page.

Footnotes:
1. No later than March 30, 2015, begin submitting discharge monitoring reports electronically using NC
DWR's eDMR application system. See Special Condition A. (11.).
2. See Special Condition A. (2.) for instream sampling locations and requirements. Instream monitoring
requirements may be provisionally waived per Condition A. (2.).
3. The monthly average effluent BODS and Total Suspended Solids concentrations shall not exceed 15%
of the respective influent value (85% removal).
4. Where monitoring is reduced to twice per week, it must occur on any two non-consecutive days
during the calendar week (Sunday through Saturday).
5. The daily average dissolved oxygen effluent concentration shall not be less than 6.0 mg/L.
6. The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
7. The Division shall consider all effluent total residual chlorine values reported below 50 µg/L to be in
compliance with the permit. However, the Permittee shall continue to record and submit all values
reported by a North Carolina certified laboratory (including field certified), even if these values fall
below 50 µg/L.
8. TN = TKN + NO3-N + NO2-N, where TN is total nitrogen, TKN is Total Kjeldahl Nitrogen, and NO3-
N and NO2-N are Nitrate and Nitrite Nitrogen, respectively.
9. TN or TP Load is the mass quantity of Total Nitrogen or Phosphorus discharged in a given period of
time. See Special Condition A. (10.), Calculation of Total Nitrogen or Total Phosphorus Loads.
10. Compliance with mass limits shall be determined in accordance with Special Condition A. (9.),
Annual Limits for Total Nitrogen or Total Phosphorus.
11. Per the Jordan Lake Wastewater Discharge Rule (15A NCAC 02B .0270) as modified by North
Carolina Session Laws 2011-394 (HB119) and 2013-395 (SB515), the annual mass Total Nitrogen limit
shall be effective beginning with calendar year 2019, unless the permittee has received by December
31, 2019, an authorization -to -construct permit for construction, installation, or alteration of the
treatment works for purposes of complying with this limit, in which case the limit shall be effective
beginning with calendar year 2021. See special condition A. (4.) on the TN Compliance Schedule.
12. Total Zinc shall be sampled in conjunction with Chronic Toxicity testing
13. Chronic Toxicity (Ceriodaphnia) P/F at 90% with testing in January, April, July and October (see
Special Condition A. (7.)).
14. The permittee shall perform three Effluent Pollutant Scans during the term of this permit. (See
Special Condition A. (8.)).
(b.) There shall be no discharge of floating solids or visible foam in other than trace amounts.

NPDES - Monitoring Reduction Frequency Evaluation (GBP)
Mebane WWTP NCO021474
BOD
CURRENT PERMIT LIMITS
Effluent
EFFLUENT LimitATIONS
Monitoring Requirements
Chars
Monthly
Weekly
Daily
Measure
Sample
Sample
Average
Average
Maximum
Frequency
Type
Location
BOD, 5 day,
200C (Apr 1
5.0 mg/L
7.5 mg/L
Daily
Composite
Influent &
Oct 31) 3
Effluent
BOD, 5 day,
200C (Nov 1
10.0 mg/L
15.0 mg/L
Daily
Composite
Influent &
- Mar 31) 3
Effluent
Data effluent only
Summer
Winter
Criterion 1 No more than one civil Penalty assessment for permit violation during 3-yr period
Stated none in request letter
Confirned by Enforcement History report in BIMS
OK
Criterion 2 Neither permittee nor its employees convicted of criminal violations of CWA w/in past 5yrs
Stated none in request letter
OK
Criterion 3 Facility not in SOC for target parameter effluent limit non-compliance
Stated as such in request letter
Confirmed by query in BIMS
OK
Criterion 4 Facility not on EPA's Quarterly Noncompliance Report for target Parameter limit violations
Stated as such in request letter
OK
Criterion 5 The 3-yr arithmetic mean of effluent data must be < 50% of the monthly avg permit limit
Reported to be 3.0 mg/L in request letter
Weighted mean = ((nsum x avgsum) + (nwin x avgwin)) / (nsum + nwin)
#sum mo/12 mo in yr x mo avg limit + #win mo/12 mo in yr x mo avg limit
6/12`5 mg/L + 6/12*10 mg/L
7.5 mg/L wt ann mo avg
3.75 is 50% of wt ann mo avg
OK 3.51 mg/L 3-yr avg
Criterion 6 No more than 15 daily sampling results over 3-vr Period can be >200% of monthv ava limit
Reported to be 4 in request letter
200% of summer monthly avg. limit = 10 m /L # summer values > 10 mg/L
2014 3 20152016�
4 daily samples exceeded 200% of the monthly average summer limit
200% of winter month) permit limit - 20 m /L #winter values > 20 mg/L
2014 0 20,52016-2017�
0 daily samples exceeded 200% of the monthly average winter limit

OK
Criterion 7 For fecal coliform or enterococci...
NA
Criterion 8 Sampling results shall not show >2 non -monthly avg limit violations during previous year
Stated none in request letter
Confirmed by DMR Violations Report in BIMS
OK
Criterion 9 Reduced effluent monitoring must not impair assessment of sensitive downstream uses
OK
(e.q. endangered species)
Not addressed in request letter
Sent e-mail request to Dennis Hodge, Wastewater Director, on 3-10-2017.
Received response on 3-13-2017 with data analysis and conclusion that RMF will not
impair assessment of sensitive downstream uses.
Reduce monitoring frequency for BOD5 to 2/week

NPDES - Monitoring Reduction Frequency Evaluation (GBP)
Mebane WWTP NCO021474
Fecal Coliform
CURRENT PERMIT LIMITS
Effluent
EFFLUENT LimitATIONS
Monitoring Requirements
Char.s
Monthly
Weekly
Daily
Measure
Sample
Sample
Average
Average
Maximum
Frequency
Type
Location
Fecal
Coliform
200/100ml-
400/100ml-
Daily
Grab
Effluent
(geometric
mean)
Criterion f No more than one civil Penalty assessment for permit violation during 3-vr period
Stated none in request letter
Confirned by Enforcement History report in BIMS
OK
Criterion 2 Neither permittee nor its employees convicted of criminal violations of CWA Win past 5 vrs
Stated none in request letter
OK
Criterion 3 Facility not in SOC for target parameter effluent limit non-compliance
Stated as such in request letter
Confirmed by query in BIMS
OK
Criterion 4 Facility not on EPA's Quarterly Noncompliance Report for target parameter limit violations
Stated as such in request letter
OK
Criterion 5 The 3-vr geometric mean of effluent data must be < 50% of the monthly avg Permit limit
Reported to be 5.9/100 mL in request letter
Geometric mean calculated using Excel formula: "=exp(average(ln(cell range))) entered using Ctrl/Shift/Enter
Geometric mean = 5.80/100 mL
50% of montly avg limit = 100/100 mL
OK
Criterion 6 With the exception of fecal coliform or enterococci...
NA
Criterion 7 No more than 20 daily sampling results may be over 200% of the weekly average limit
Reported to be 17 in request letter
200% of 400/100 mL weekly avg limit = 800/100mL
2014 #REF! 2015 #REF! 2016-2017 #REF!
#REF! daily samples > 200% of permit limit
< 20 daily samples exceeded 200% of the 400/100 mL permit limit
OK

Criterion 8 Samplinq results shall not show >2 non -monthly ayq limit violations during previous year
Stated none in request letter
Confirmed by DMR Violations Report in BIMS
OK
Criterion 9 Reduced effluent monitoring must not impair assessment of sensitive downstream uses
(e.g. endangered species)
Not addressed in request letter
Sent e-mail request to Dennis Hodge, Wastewater Director, on 3-10-2017.
Received response on 3-13-2017 with data analysis and conclusion that RMF will not impair assessment of
sensitive downstream uses.
OK
Reduce monitoring frequency for Fecal Coliform to 21week

Perlmutter, Gary
From: Amy Varinoski <[e-mail]>
Sent: Monday, March 13, 2017 1:27 PM
To: Perlmutter, Gary
Cc: Dennis Hodge; Grzyb, Julie; Templeton, Mike
Subject: RE: additional information request
Attachments: MebaneFOMReduction.xlsx
Good afternoon,
On the CV Comparison worksheet of the attached Excel file, MebaneFOMReduction.x1sx, Effluent BOD and Fecal
Coliform data are displayed both as generated for five days per week and to represent the proposed reduction to bi-weekly
monitoring for these parameters. (Tuesday and Thursday were selected to compare against data sets with Monday
through Friday data. In other cases where Monday through Friday data was not available, due to holidays, etc. an
appropriate standard selection of data was used.) Statistical analysis was conducted to determine the arithmetic mean,
standard deviation, and the coefficient of variation (CV) for each data set. Relative percent difference was used to
compare the CVs calculated for the 5-day and proposed bi-weekly data for BOD and Fecal Coliform and resulted in
5.75% and 8.23%, respectively. Given that these data sets vary by less than 10% RPD, it is concluded that reduction in
monitoring frequencies for each parameter would not impair assessment of downstream uses, such as endangered species.
Please feel free to contact me or Dennis Hodge, Wastewater Director, if you have any questions or should need any
additional information.
Sincerely,
Amy Varinoski
Water Resources Compliance Manager
1A dune
Positively Charming
106 E Washington Street
Mebane, NC 27302
0 919 304-9217
www.citvofinebane.com
-IAWN
From: Dennis Hodge
Sent: Friday, March 10, 2017 2:08 PM
To: Amy Varinoski
Subject: Fwd: additional information request
Hey Amy,
Just got this from DEQ. Have a great weekend!
Thanks,
Dennis

Dennis J. Hodge
Water Resources Director
City of Mebane
336-906-5583
Sent from Fhone so there may be errors
Begin forwarded message:
From: "Perlmutter, Gary" <[e-mail]>
Date: March 10, 2017 at 11:34:31 EST
To: "[e-mail]" <[e-mail]>
Cc: "Grzyb, Julie" <[e-mail]>
Subject: additional information request
Dear Mr. Hodge,
I am processing your request for reduction in monitoring frequencies in your NPDES Permit No.
N00021474, and have found no information regarding potential impacts of the reduced monitoring to
the downstream water quality. The approval criterion addressing potential impacts in the DWQ
Guidance Regarding the Reduction of Monitoring Frequencies in NPDES Permits for Exceptionally
Performing Facilities states:
"Reduced effluent monitoring must not impair assessment of sensitive downstream uses, such as
endangered species."
Can you provide this information so that I can complete processing your request?
Thank you in advance,
Gary Perlmutter
Gary B. Perlmutter, M.S.
Enivronmental Senior Specialist
NPDES Complex Permitting
INC DEQ / Division of Water Resources / Water Quality Permitting
919 807 6385 office
919 707 9000 main office
gars. perlm utter(a)ncdenr.gov
Physical Address: 512 North Salisbury St.,Raleigh, NC, 27604
Mailing Address: 1617 Mail Service Center, Raleigh, NC, 27699-1617
PC. !`Nothing Compares
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.

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1�
fte6ane
February 27, 2017
Mr. Mike Templeton and Ms. Julie Grzyb
NPDES Complex Permitting Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
RE: Request for Permit Modification
NPDES Permit No. NCO021474
Mebane WWTP
Facility Class IV
Alamance County
Mr. Templeton and Ms. Grzyb,
RECEIVEDINCDEUDG11+,
MAR - 7 161 /
WaterQSaiat
Permitting
The above referenced NPDES permit authorizes discharge of treated wastewater from a designated
effluent Outfall and establishes monitoring requirements. As explained in further detail below, I would
like to request modification of this permit with regard to the location of the Effluent Outfall and the
monitoring frequencies for both Biochemical Oxygen Demand [BOD5] and Fecal Colifonn. While these
requests and attachments are submitted under the same cover, approval or denial of one request should
not preclude approval or denial of the other.
Relocation of Effluent Outfall 001
During heavy rain events, gravity effluent discharge is impeded by both the rise in the creek level as well
as increased flow through the facility. In the event that flow is allowed to backup over the effluent filter
weirs, it is highly likely that the tertiary filtering equipment will be impacted resulting in costly repairs
and/or replacement of equipment. Therefore, during these events, a surge pump in the chlorine contact
chamber is engaged. However, during the last several rain events the surge pump hasn't been able to
provide sufficient pumping capacity and has required the use of supplemental, portable pumps. During
the last two extreme rain events of 2016, water was within 2 inches of flooding effluent filtering
equipment.
Per our City engineer, it appears that with a 36" pipe discharging approximately 1,000 linear feet
downstream from the current discharge point (denoted as "B" in the attached image) we would be able to
carry 10 MGD without backing water up to the effluent filter weirs during a 100 year storm event. The
City owns both sides of the creek at this potential discharge point (denoted as "C" in the attached image)
and the Flood Elevation at this point is approximately 597.25.
The head required to gravity flow 10 MGD is 0.672'. With a submerged Outfall at the proposed location
elevation of 597.25, the upstream elevation required for gravity discharge would be 597.92. This
elevation is below the weir elevation of the filters at 598.5 and just above the weir elevation of the
chlorine contact chamber at 597.75 during a 100 year storm event and 10 MGD flow. Therefore, I would
like to request a modification to the Effluent Outfall location in the referenced NPDES permit.
CITY OF MEBANE 106 E. Washlneton St.I Mebane. NC 27302 0 919 304 9215 919 563 6144 0 dhodeeOcitvofinebane.com

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DWO Guidance Regarding the Reduction of Monitoring Freauencies in NPDES Permits for
Exceptionally Performing Facilities
Consistent with the approval criteria listed in the guidance issued by the Division on October 22, 2012, I
would like to request a reduction in the monitoring frequencies from "Daily" to "Twice per Week" for
both Biochemical Oxygen Demand [BOD5] and Fecal Coliform.
Overall:
o Neither the City of Mebane nor any of its employees have been convicted of criminal
violations of the Clean Water Act within the previous five years.
o The City of Mebane W WTP is not currently under an SOC for any effluent limit
noncompliance.
o The City of Mebane W WTP is not on EPA's Quarterly Noncompliance Report for any
limit violations.
o Three-year review period — January 1, 2014 through December 31, 2016
Biochemical Oxygen Demand 1BOD$I:
o The facility has had zero civil penalty assessments for BOD permit limit violations
during the previous three years.
O Effluent BOD three year arithmetic mean = 3.0 mg/L (<50% of 7.5mg/L annual
arithmetic mean of seasonal Monthly Average BOD5 Permit Limits)
o Number of daily BOD5 sampling results >200% of monthly average limit during three
year review period = 4
o Number of non -monthly average limit violations during the previous year = 0
Fecal Coliform:
o The facility has had zero civil penalty assessments for fecal coliform permit limit
violations during the previous three years.
o Effluent fecal coliform three year geometric mean = 5.9/100mL (<50% of 200/100mL
Monthly Average Fecal Coliform Permit Limit)
o Number of daily fecal coliform sampling results >200% of monthly average limit during
three year review period = 17
o Number of non -monthly average limit violations during the previous year = 0
If you need any additional information please feel free to contact the undersigned. Thanks for your
consideration and assistance in the modification of this permit.
Sincerely,
Dennis J. Hodge
Wastewater Director
Attachment(s): MebaneEffluentOutfall.png (submitted via email 2/27/17)
MebaneF0MReduction.x1sx (submitted via email 2/27/17)
CITY OF MEBANE 106 E. Washineton St. I Mebane. NC 27302 G 9193049215 F 9195636144 O dhodee(&citvofinebane.com