NC0021156_Permit Modification_20150116

JIRDE:i DOCUWENT :iCANNINL COVER SHEET
NPDES Permit:
NC0021156
Mount Holly WWTP
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Approval
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
January 16, 2015
This document is printed on reuse paper - igriore any
content on the resrerse side

A
NC��VA
DENR
North Carolina Department of Environment and Natural Resources
Pat McCrory
Governor
Mr. Danny Jackson, City Manager
City of Mount Holly
P.O. Box 406
Mount Holly, North Carolina 28120
Dear Mt. Jackson:
Donald R. van der Vaart
Secretary
January 16, 2015
Subject Final NPDES permit modification
Permit NCO021156
Mount Holly W WTP
Gaston County
Class 4 Facility
Division personnel have reviewed and approved your application for modification of the subject
permit. Accordingly, we are forwarding the attached NPDES permit. This permit 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).
The final permit modification contains the following changes from your previous permit:
The mercury limit and monitoring requirements were deleted from the permit. T)
A new special condition was added including requirements to develop a Mercury
Minimization Plan (See Special Condition A (7)).
The compliance schedule for the Total Phosphorus annual limit was extended by one year to
2015.
If any parts, measurement frequencies or sampling requirements contained in this permit ate
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 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.
1617 Mail Service Center, Ralegh, North Carolina 27699-1617
Location: 512 N. Salisbury St Raleigh, North Carolina 27604
Phone: [phone] FAX: [phone]
Internet www.ncwatemualitv.ora
An Equal Opportunity 1 ARnnafive Action Enptoyer

Mr. Danny Jackson
January 16, 2015
Page 2 of 2
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 any other Federal, State, or Local governmental permits that may be required.
If you have any questions concerning this. permit, please contact Teresa Rodriguez at telephone
number [phone] or at email [e-mail]. -
Sin eetely,, AA
()�
Jay Zimmerman, Acting Director
lvJ�/ Division of Water Resources, NCDENR
cc: NPDES Files
Central Files
EPA Region 4 (e-copy)
Mooresville Regional Office / Surface Water Protection Section (e-copy)

Permit NCO021156
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES -
DIVISION OF WATER RESOURCES
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLL
UTANT DISCHARGE ELIMINATION SYSTEM
(NPDES)
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
1, Act, as amended,
City of Mount Holly
is hereby authorized to discharge wastewater from a facility located at
Mount .Holly WWTP
Broome Street, Mount Holly
Gaston County
to receiving waters designated as the Catawba River within the Catawba River Basin,
in accordance with effluent limitations, monitoring requirements, and other
conditions set forth in Parts I, II, III and IV hereof.
This permit modification shall become effective February 1, 2015.
This permit and authorization to discharge shall expire at midnight February 28, 2015.
Signed this day January 16, 2015.
\L* Zimmerman, Acting Director
d*Division of Water Resources
By Authority of the Environmental Management Commission
Page 1 of 10

Permit NCO021156 '
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.
City of Mount Holly is hereby authorized to:
1. Continue discharging 4.0 MGD of treated domestic and industrial wastewater
from an activated -sludge wastewater treatment facility consisting of:
• manually cleaned influent bar screen,
• dual grit chambers,
• Parshall flume with instrumented flow measurement,
• flow equalization basin,
• three aeration basins with mechanical aeration,
• dual secondary clarifiers,
• dual chlorine contact chambers with gas chlorination,
• four sludge holding tanks
• dechlorination
• dual sludge holding tanks (not in use - formerly clarifiers that have been
replaced)
• dual sludge drying beds (not in use),
The facility is located at the Mount Holly WWTP, 201 Broome Street, Mount ` _�
Holly, Gaston County;
2. Continue to discharge from said wastewater treatment works through Outfall 001
to the Catawba River (see attached map), a stream classified as ITS -IV CA waters
within the Catawba River Basin.
Page 2 of 10

Permit NCO021156
Part I
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [I SA NCAC 02B .0400 et
seq., 02B .0500 et seq.]
During the period beginning on the effective date of the permit and lasting until expiration, the
Permittee is authorized to discharge through Outfall 001. Such discharges shall be limited and
monitored by the Permittee as specified below:
PARAMETERS
}
_"
i, `'
S
'' :EFFLUENTLIMITS
j'� MONITO- R INGRE
0 U 1RREMENTS;
y
A+`e"r gefl�laximum
VV�leek�iy
Daily.
II?leasurem`en
Fr"equencyF�
Sample
:r ;TypeL_ocation
Sample
Flow MGD
I
4.0
Continuous
Recordingy
I or E
Ij
Total Monthly Flow (MG) T
Monitor & Report
Monthly
Recorded
or
Calculated
I or E
BOD, 5 day, 20°C 2
30.0 mg/L
45.0 mg/L
Daily
Composite
E, I
Total Suspended Solids (TSS)2
30.0 mg/L
45.0 mg/L
Daily
Composite
E, I
NH3 as N
3/Week .
Composite
E
Fecal Coliform (geometric mean)
200 100 ml
400 100 ml
Daily
Grab
E
Total Residual Chlorine (TRC) 3
28 µg/L
Daily
Grab
E
Dissolved Oxygen 4 �'
Daily
Grab
E
Temperature °C �l,
Daily
Grab
E
H5
Daily
Grab
E
TKN (mg/L) 6
Monitor & Report
Weekly
Composite
E
NO3-N + NO2-N (mg/L) 6
Monitor & Report
Weekly
Composite
E
Total Nitrogen (mg/L) 6,7
Monitor & Report
Weekly
Composite
E
TN Load ?
Monitor & Report (lb/mo)
Monthly
Calculated
E
64,200 (lb/summer) 8
Seasonally
Calculated
E
ii
Total Phosphorus (mg/L) 7
Monitor & Report
Weekly
Composite
E
TP Load ?
Monitor & Report (lb/mo)
Monthly
Calculated
E
18,250 lb/yr 8
Annually
Calculated
E
Chronic Toxicity9
Quarterly
Composite
E
Dichlorobromomethane
Quarterly
Composite
E
Total A=ony 1i
Quarterly
Composite
E
Total Copper
Quarterly
Composite
E
Total Silver
Quarterly
Composite
E
Temperature, °C
Variable 10
Grab
U, D
Conductivity
Variable10
Grab
U, D
Dissolved Oxygen
Variable 10
Grab
U, D
Effluent Pollutant Scan11
Annual
See A. (6)
E
Footnotes:
1. Sample Locations: E - Effluent; I - Influent; U - Upstream at Hwy 27 Bridge; D - Downstream, just
below Hwy 29/74 bridge.
2. Monthly average effluent concentrations for Biochemical Oxygen Demand (BOD5) and TSS shall not
exceed 15% of respective influent values (i.e. the facility shall achieve 85% removal).
3. The Division shall consider all effluent total residual chlorine values reported below 50ug/L to be in
compliance with the permit. However, the Permittee shall continue to record and submit all values
reported by aINorth Carolina certified laboratory (including field certified), even if these values all
below 50 ug/L.
Page 3 of 10

Permit NCO021156
4. The daily average dissolved oxygen effluent concentration shall not be less than 5.0 mg/ L.
5. pH shall not fall below 6.0 nor exceed 9.0 standard units.
6. For a given wastewater sample, 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.
7. TN (or TP) Load is the mass quantity of Total Nitrogen (or Total Phosphorus) discharged in a given
period of time. See Special Condition A. (4.), Calculation of Nutrient. Loads.
8. The TP Load limit shall become effective January 1; 2015, and the TN Load limit shall become
effective April 1, 2017. Compliance with these limits shall be determined in accordance with Special
Condition A.(3.) Total Nitrogen and Total Phosphorus Limits.
9. Chronic Toxicity (Ceriodaphnia) at 6 %; quarterly during February, May, August, and November (See
Special Condition A. (5.)
10. Variable: permittee shall sample upstream and downstream 3/week during summer months of June, July,
August, and September, weekly during the rest of the year.
11. See Special Condition A. (6.)
Effluent shall contain no floating solids or foam visible in other than trace amounts.
Page 4 of 10

Permit NCO021156
SUPPLEMENT TO EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
SPECIAL CONDITIONS
A. (2). NUTRIENT ALLOCATIONS [G.S.143-215.1(b)]
(a.) The following table lists the Total Nitrogen (TN) and Total Phosphorus (TP) allocations assigned
to, acquired by, or transferred to the Permittee in accordance with the 1995 Lake Wylie TMDL
and nutrient management strategy and the status of each as of permit issuance. For compliance
purposes, this table does not supersede any TN* or TP limit established elsewhere in this permit.
Total Nitrogen Allocation
;_ALL ►?CATION
PE
'. .:
SOURCE i
--:- :_:
DATE
•-:-.r z
'AL�'LbC ITA ON
,
S
a TATUS
Base
Assigned in TMDL
1995
64,200 lb
Active
TOTAL
64,200Ib
Active
11 Footnote:
1 In accordance with the 1995 TMDL, nitrogen allocation applies to the summer
season, which is defined as April 1 - October 31.
Total Phosphorus Allocation
A�LO,¢ATIC N
Tjj((
- s �; Y O. , 14
SOURCE
.
-
'DATE
-
f {DISCHARGE . `
r
STATUS
PE
z
ALL`OCATON
Base
Assigned in TMDL
1995
18,250 lb
Active
TOTAL
18,250 lb
Active
11 . Footnote:
1 In accordance with the 1995 TMDL, phosphorus allocation applies on a calendar year
basis, January 1 - December 31.
(b.) Any addition, deletion, or modification of the listed allocation(s) (other than to correct
typographical errors) or any change in status of any of the listed allocations shall be considered a
major modification of this permit and shall be subject to the public review process afforded such
modifications under state and federal rules.
11
A.(3). TOTAL NITROGEN AND TOTAL PHOSPHORUS LIMITS [G.S.143-215.1(b)]
(a.) Total Nitrogen (TN) allocations and load limits for NPDFS dischargers in the Lake Wylie
watershed are seasonal limits and apply to the summer season, which is defined as April 1
through Cctoper 31 of each year. Total Phosphorus (TP) allocations and load limits are annual
limits and apply on a calendar year basis.
(b.) The TN (or TP) Load limit in this Permit may be modified as the result of allowable changes in
the Permittee's allocation.
(i.) Allowable changes include those resulting from the purchase, sale, trade, or lease of
allocation between the Permittee and other dischargers assigned allocation under the 1995
Lake Wylie TMDL; regionalization (if both facilities were assigned allocation); and other
transactions approved by the Division.
Page 5 of 10

Permit NCO021156
(ii.) The Permittee may request a modification of the TN (or TP) Load limit in this Permit to
reflect allowable changes in its allocation.
(A) Upon receipt of timely and proper application, the Division will modify the permit as
appropriate and in accordance with state and federal program requirements.
(B) Changes in TN limits become effective on the first April 1 following permit
modification, and those for TP become effective on January 1 of the year following
permit modification. The Division must receive application no later than 180 days
prior to the requested effective date for any limit change.
(iii.) Any requests for modification should be sent to:
NCDENR/ DWR/ NPDES Programs
1617 Mail Service Center
Raleigh, NC 27699-1617
A. (4). CALCULATION OF NUTRIENT LOADS [G.S.143-215.1(b)}
(a.) The Permittee shall calculate monthly, seasonal, and annual nutrient loads as follows:
(i.) Monthly TN (or TP) Load (lb/mo) = TN (or TP) x TMF x 8.34
where:
TN or TP = the average Total Nitrogen or Total Phosphorus concentration
(mg/ L) of the composite samples collected during the month
TMF — the Total Monthly Flow of wastewater discharged during the
month (MG/mo)
8.34 = conversion factor, from (mg/ L x MG) to pounds
(ii.) Sumner TN Load (lb/ summer) = Sum of the April -October Monthly TN
(iii.) Annual TP (or TN) Load (lb/yr) = Sum of the 12 Monthly TP (or TN) Loads for the calendar
year
(b.) The Permittee shall report monthly Total Nitrogen and Total Phosphorus results (mg/L and
lb/mo) in the appropriate discharge monitoring report for each month; the summer TN results
with that year's October DMR; and each calendar year's results (lb/yr) with the December report
for that year.
Page 6 of 10

Permit NCO021156
A. (5.) CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY) [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 6 %.
The permit holder shall perform at a minimum, guarterlx monitoring using test procedures outlined in the "North Carolina
Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised February 1998, or subsequent versions or "North Carolina
Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or subsequent versions. The tests will
be performed during, the months of February, May, August, and November. Effluent sampling for this testing 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 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 -February 1998)
or subsequent versions.
The. chronic value for multiple concentration tests will be determined using the geometric mean of the highest
concentration having no detectable impairment of reproduction or survival and the lowest concentration that does have a
detectable impairment of reproduction or survival. The definition of "detectable impairment," collection methods, exposure
regimes, and further statistical methods are specified in the "North Carolina Phase II Chronic Whole Effluent Toxicity Test
Procedure" (Revised -February 1998) 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. If reporting pass/fail results using the parameter code TGP313,
DWQ Form AT-1 (original) is sent to the below address. If reporting Chronic Value results using the parameter code
TBP3131 DWQ Form AT-3 (original) is to be sent to the following address:
Attention: North Carolina Division of Water Resources
Water Sciences Section
1621 Mail Service Center
Raleigh, North Carolina 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. I Should there be no discharge 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 "No Flow" in the comment area of the
form. The report shall be submitted to the Environmental 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. 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.
If the Permittee monitors any pollutant more frequently then required by this permit, the results of such monitoring shall be
included in the calculation & reporting of the data submitted on the DMR & all AT Forms submitted.
I,h
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 7of10

Permit NCO021156
A. (6.) EFFLUENT POLLUTANT SCAN [G.S.143-215.1(b)]
The permittee shall perform an annual Effluent Pollutant Scan for all parameters listed in the table below (in accordance with
40 CFR Part 136). The annual effluent pollutant scan samples shall represent seasonal (summer, winter, fall, spring) variations
over the 5-year permit cycle. Unless otherwise indicated, metals shall be analyzed as "total recoverable." Additionally, the
method detection level and the minimum level shall be the most sensitive as provided by the appropriate analytical
procedure.
Ammonia (as N)
Trans-1,2-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/Nitrite
1,3-dichloropropylene
4-bromophenyl phenyl ether
Kjeldahl nitrogen
Ethylbenzene
Butyl benzyl phthalate
Oil and grease
Methyl bromide
2-chloronaphthalene
Phosphorus
Methyl chloride
4-chlorophenyl phenyl ether
Total dissolved solids
Methylene chloride
Chrysene
Hardness
1,1,2,2-tetrachloroethane
Di-n-butyl phthalate
Antimony
Tetrachloroethylene
Di-n-octyl phthalate
Arsenic
Toluene
Dibenzo(a,h)anthracene
Beryllium
1,1,1-trichloroethane
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 (Method 1631E)
P-chloro-m-cresol
Dimethyl phthalate
Nickel
2-chlorophenol
2,4-dinitrotoluene
Selenium
2,4-dichlorophenol
2,6-dinitrotoluene
Silver
2,4-dimethylphenol
1,2-diphenylhydrazine
Thallium
4,6-dinitro-o-cresol
Fluoranthene
Zinc
2,4-dinitrophenol
Fluorene
Cyanide
2-nitrophenol
Hexachlorobenzene
Total phenolic compounds
4-nitrophenol
Hexachlorobutadiene
Volatile organic compounds:
PentachIorophenol
Hexachlorocyclo-pentadiene
Acrolein
Phenol
Hexachloroethane
Acrylonitrile
2,4,6-trichlorophenol
Indeno(1,2,3-cd)pyrene
Benzene
Base -neutral copounds:
Isophorone
Bromoform
Acenaphthene
Naphthalene
Carbon tetrachloride
Acenaphthylene
Nitrobenzene
Chlorobenzene
Anthracene
N-nitrosodi-n-propylamine
Chlorodibromomethane
Benzidine
N-nitrosodimethylamine
Chloroethane
Benzo(a)anthracene
N-nitrosodiphenylamine
2-chloroethylvinyl ether
Benzo(a)pyrene
Phenanthrene
Chloroform
3,4 benzofluoranthene
Pyrene
Dichlorobromomethane
Benzo(ghi)perylene
1,2,4-trichlorobenzene
1,1-dichloroethane
Benzo(k)fluoranthene
1,2-dichloroethane
Bis (2-chloroethoxy) methane
Test results shall be reported to the Division in DWQ Form- A MR-PPA1 or in a form approved by the
Director within 90 days of sampling. The report shall be submitted to the following address: Division of
Water Resources, Surface Water Protection Section, Central Files,1617 Mail Service Center, Raleigh, North
Carolina 27699-1617.
Page 8 of 10

Permit NCO021156
A (7). MERCURY MINIMIZATION PLAN [G.S. 143-215. 1 (b)]
The permittee shall develop and implement a mercury nuirdimization plan 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 (htty://-Dortal.ncdenr.or web/wq/sm/ps/npdes,
under Model Mercury Minimization Plan). The 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 9of10

Permit NCO021156
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pstreml le Poi
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r H,u7 ~'
;• Mount Holly WWTP�o
�. Outfall 001
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City of Mount Holly
Facility
Mount Holly WWTP
Location
Latitude: 35'15'55"N State Grid/Ouad: F14SE/MLHo11y,NC
not to scale
Loweltude: 81"00'35" W PermittedFimc 4.OMGD
ReceivinnStream: Catawba River Dninage Basin: Catawba Riv Basin
North
NPDES Pelmit No. NC0021156
Steam Class: WS-IV CA Sub-Basio/HUC: 03-OS-3310305010114
Gaston CoUnfv
Page 10 of 10

• A14
9
AFFIDAVIT OF INSERTION OF ADVERTISMENT
The Gaston Gazette
1 41C NOTICE,
i�i Carolfiia
iironm�iEtal =�:
nagement Gastonia, N.C.
nmissio�/ (Gaston County
D�SUntat•
r mail. Service cettw
tig , HC: 27699-lov f
I{ :10EOF
The Gaston Gazette does certify that the advertisement for:
��E A'�NPDES
#STEIll1'R; ASTEWATER PERMIT: NC0021156, CITY OF MT HOLLY
Nor&t Ca ..... F_nvi= .
nentar:_`Managsm t_ :Measuring 6.53 inches appeared in The Gaston Gazette, a newspaper published in
essPste aston County, Gastonia, N.C., in issue(s):
I„ disdkiarge �; permf t:.to
r§bii(s) tiste bssow.
'Fi�comme�ts ':regard-; .
e rPloPa pertn�
30_ j12/05/2014
an . -anti
�OCiAS/G&i@Rdill'.70� t3
:a(Iing' (919) ;8t)J-s� Name of Account: NCDENR/DWQ/NPDES
I� ii a ;ar' Order Number: 54557425
ion to pe—*.- NC00211W,
rgin9totrcatawaa Ad Number: 54650434
diver to the Catawba River
3asin. '
IC-Deoe er5,2014..
rest GS557425 tp ssssa Sworn to, and subscribed before me this 5 th day of December, 2014.
J
Serella M. Greene, Notary Public
My Commission Expires Oct.24, 2016

Pevmrl Mop{ 14015
DENR/DWR
FACT SHEET- NPDES Permit Modification
NPDES No. NC0021156
Facility Information
A licant/Facdi Name:
City of Mount Holly / Mount Holl W W TP
Applicant Address:
P.O. Box 406,131 South Main Street Mount Holly NC 28120
Acldress:
201 Broome Street, Mount Holly NC 28120
-Ficility
Permitted Flow
4.0 MGD(Facility Class III faeili
Type of W ste:
Municipal domestic and industrial wastewater
—Facility/Permit Status:
Modification
Coun ,:
Gaston
Miscellaneous
Stream:
Catawba River
Re gional Office:
Mooresville
-Receiving
Strewn Classification:
WS-IV CA
USGS To o Quad:
F14SE
303 d Listed?:
Yes; low pH
Permit Writer:
Teresa Rodriguez
Subbasin:
03-08-33
Date:
Nov. 2014
HUC:
03050101
Area (mil :
2015
-Drainage
Summer cfs
95
Winter 7Q10 10 (cfs):
-
30Q2 cfs :
716
Flow cfs :
3016
-Average
IWC Cl @ 4 MGD:
6%
Primary SIC Code:
4952
Hlstor
This facility is a major municipal treatment plant operating in Gaston County. The current
design capacity is 4.0 MGD and serves a population of 9,835 people. The facility has a full
pretreatment program with four (4) significant industrial users. This current permit expires
February 28, 2015.
Permit Modification Request
The permittee has requested two changes to the current permit, which are evaluated below.
1.0 Request for Re-evaluation of Mercury Limit in accordance with TMDL.
The facility currently has a mercury limit of 12 ng/1(Monthly Average) and 36 ng/l (Daily
Maximum). These limits were developed in 2011 prior to the EPA -approved 2012 Statewide
Mercury TMDL. Mercury effluent data for the period August 2011 — October 2014 is
narivarl halnw'
............. ...
Year
Annual Avg n 1
Max Value n 1
# samples
2011
3.05
4.07
5
2012
9.42
19.2
20
2013
6.35
13.3
13
2014
11.18
16.8
20
TMDL Criteria:
196 BEL)
47 TBEL)
Page 1

Updating the mercury analysis in conformance with the TMDL implementation procedures
results in a determination of no mercury limit needed. The WQBEL for mercury would be 196
ng/l, based on the chronic water quality standard (12 ng/1) multiplied by the dilution factor
(16.31). All annual average mercury effluent values are below the WQBEL. Likewise, all
mercury effluent values are below the TBEL value of 47 ng/l. Conclusion: Remove mercury
limit/monitoring. However, since the facility has reported effluent values > 1 ng/1 and the
facility. design flow is > 2 MGD, a Mercury Minimization Plan (MMP) will be required. A new
MMP Special Condition A(7) has been added to this proposed permit modification.
2.0 Request for Consideration of Nutrient (TP) Compliance Date.
The current permit included new TN and TP mass limits based on complying with the. Lake
Wylie TMDL, The TP limit was to be effective for CY2014. This permit modification
proposes to extend the compliance period by one year, to CY2015. This will provide time for
full execution of an agreement between the Permittee and City of Charlotte and incorporation
into_ the_ next permit renewal --in_ 2015.-. An interim plan is for -the City. of Charlotte -to -lend/ -lease
nutrient load to Mount Holly, followed by ultimate connection of City of Mount Holly to the
City of Charlotte wastewater treatment system. This will alleviate the need for Mount Holly to
install nutrient removal equipment for an interim period, with ultimate closure of the WWTP.
Proposed Changes in Permit Modification
• Delete effluent mercury limit/monitoring.
• Add Mercury Minimization Plan (NEAP) Special Condition A(7).
• Extend TP compliance date by one year, to 2015.
NPDES Contact:
If you have any questions on any of this proposed permit modification, please contact Teresa
Rodriguez at 919-807-6387 or [e-mail].
NAME: � � DnT'E: 4XAL
Page 2

%w t M4,
�frreve.J
Cnz1Ise
From: Jonathan Jordan [e-mail]]
Sent: Tuesday, November 04, 2014 3:32 PM
To: Belnick, Tom
Cc: Bell, Wes
Subject: Re evaluation of total meruruy limit (Permit #NC0021156)
Attachments: Signed Request for Re evaluation of total mercury limit 11-4-20.pdf
Mr. Belnick
Please see attachment
IV10) y
As per our conversation on 11/3/2014 attached is the City of Mount Holly's formal request for a re-evaluation of the
total mercury monthly average limit on permit #NC0021156. The original signed copy will be mailed to your attention on
11/5/2014. 1 would like to thank you for taking the time to explain our options clearly, it was very helpful. If you have
any further questions please feel free to contact me at any time.
Thanks,
Jonathan Jordan
City of Mount Holly
Wastewater Treatment Plant
Superintendent/Laboratory Manager
Office: (704)-827-4261
Cell: (704)-860-1417
MOUNr
HOLLY
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Mo
vNr�LLY
400 East Central Avenue
Post Office Box 406
Mount Holly, NC 28120
704-827-4261
704-827-6306 Fax
Website: www.mtholly.us
CITY of MOUNT HOLLY
November 4, 2014
UTILITIES DEPARTMENT
RE: Request for re-evaluation of current total mercury limit for permit #NCO021156
WATER TREATMENT
WASTEWATER TREATMENT
STORM W ATER
GIs TECHNOLOGY
ATTN: Mr. Tom Belnick RECEIVED/DENR/DWR
[e-mail]
NPDES Unit
1617 Mail Service Center NOV 1 2 2014
Raleigh, NC 27699-1617 Water Quality
Permitting Section
Mr. Belnick
The City of Mount Holly would like to request a re-evaluation of its current total mercury limit of 12.Ong/L
monthly average. The City of Mount Holly's Wastewater Treatment Plant is experiencing issues with meeting
the current monthly average limit of 12.Ong/L, With NOV's occurring in the month of January 2012 and
September 2012 and expecting NOV's for August 2014 and October 2014. The pretreatment staff is currently
exhausting every possible avenue in locating mercury discharges. In a continued effort to identify, educate and
reduce possible sources of mercury in the City's collection system, the City's Pretreatment program has
completed the following steps:
Required monthly monitoring on all IUP's, meetings with all Significant Industrial Users (SIU) were
scheduled and completed. These meetings required the SIUs to identify as many sources of mercury as
possible. This will include but is not limited to: raw materials, lab equipment, switches and thermostats,
obsolete equipment and cooling toweriboiler blow down. The estimated time of completion for
collecting this data is around the second week in November.
Samples were taken from the three major trunk lines that feed the majority of the wastewater to the
POTW. The results from these three lines was somewhat inconclusive with results of 5.3 s for the
Catawba Heights side of town, 3.2 s in our Dutchman's Creek lift station and a 4.1 s in the trunk line
coming from Stanley, NC. Internal samples of the combined Clarifier effluent as well as mechanical
aerator gear oil we also analyzed. The results of these virtually eliminated them as a possible source of
mercury. The clarifier effluent was found to contain 13.0 9. This was grabbed approximately 45
minutes before a total effluent sample was grabbed which resulted in a 16.8 s concentration. Samples
were taken from the domestic drinking water and alum sludge with results of non detect. A sample was
taken from the Carolinas Rehabilitation Center with a result of non detect.
Page 1 of 2

• The three dental practices within the City of Mount Holly were inspected and found to have proper
mercury amalgam separating devices in operation.
At this time the City is exhausting every possible avenue for mercury discharge. The City will further sample
its wastewater treatment plant equalization basin and effluent. In an effort to establish a broad data trend, these
samples will continue to be taken on varying days of the week and at different times.
As the City's Pretreatment program receives more data and information on potential sources of mercury
discharges within the collection system, this data will continue to be added to the City's Mercury Minimization
Plan (MMP), a document which outlines how the City will reduce its point source distribution of mercury to the
environment. This document will eventually be required by the State of North Carolina for the City to have and
actively implement.
Attached you will find the following documents:
• Attachment 1-Wastewater Treatment Plant Effluent monitoring data for total mercury from August 4,
2011 — October 23, 2014
• Attachment 2- Industrial Monitoring from January 2012- September 2014
• Attachment 3- Analytical reports for sources other than industry
If you have any further questions please feel free to contact me at 704-827-3931.
Sincerely,
Danny Ja son
City Manager
City of Mount Holly
RECEIVED/DENR/DWR
NOV 12 2014
Water Quality
Permitting Sectlon
Page 2 of 2

Mercury Flow at WWTP
Sampling Date
Influent
Effluent
Flow
[MGD]
Conc.
[ng/L]
Mass
[lbs.]
Flow
[MGD]
Conc.
[ng/L]
Mass jibs.]
limit
[ng/L]
8/4/2011
2.472
2.32
4.78E-05
12
9/8/2011
2.427
2.63
5.32E-05
12
10/6/2011
1.732
3.77
5.45E-05
12
11/10/2011
2.303
2.45
4.71E-05
12
12/8/2011
2.138
4.07
7.26E-05
12
1/5/2012
2.441
2.166
19.2
3.47E-04
12
1/24/2012
2.052
2.228
12.3
2.29E-04
12
1/26/2012
2.142
2.672
11.7
2.61E-04
12
1/30/2012
1.839
1.884
9.83
1.54E-04
12
1/31/2012
2.057
2.188
10.8
1.97E-04
12
2/9/2012
2.100
100
1.75E+00
2.153
9.5
1.71E-04
12
3/8/2012
2.185
2.425
7.66
1.55E-04
12
4/5/2012
2.269
2.565
4.03
8.62E-05
12
5/10/2012
2.031
100
1.69E+00
2.209
5.9
1.09E-04
12
6/7/2012
2.136
2.253
5.61
1.05E-04
12
7/12/2012
2.053
2.381
9.17
1.82E-04
12
8/9/2012
2.339
5
9.75E-02
2.772
12
2.77E-04
12
9/6/2012
1.829
2.021
15.1
2.55E-04
12
9/14/2012
2.283
2.377
12.4
2.46E-04
12
9/20/2012
2.122
12.6
2.23E-01
2.132
13.6
2.42E-04
12
9/25/2012
1.928
2.34
3.76E-02
2.128
12
2.13E-04
12
10/4/2012
1.720
6.35
9.11E-02
1.98
3.03
5.00E-05
12
10/9/2012
2.121
2.296
3.66
7.01E-05
12
11/8/2012
1.730
100
1.44E+00
2.009
2.48
4.16E-05
12
12/4/2012
2.109
7.58
1.33E-01
2.198
8.38
1.54E-04
12
1/10/2013
2.228
2.174
1.6
2.90E-05
12
2/4/2013
2.294
1.71
3.27E-02
2.088
12
2/8/2013
2.919
2.682
4.75
1.06E-04
12
3/8/2013
2.095
7.56
1.32E-01
1.565
2.36
3.08E-05
12
4/1/2013
2.146
8.22
1.47E-01
2.144
12
4/5/2013
2.231
2.18
4.06
7.38E-05
12
5/6/2013
4.828
7.72
3.11E-01
7.904
12
5/10/2013
2.006
1.798
3.76
5.64E-05
12
6/3/2013
1.871
8.36
1.30E-01
1.87
12
6/10/2013
2.030
2.121
8.35
1.48E-04
12
7/1/2013
1.928
4.6
7.40E-02
1.951
12
7/5/2013
1.769
1.912
2.2
3.51E-05
12
8/5/2013
1.919
11.4
1.82E-01
2.147
12
8/9/2013
1.908
2.057
10.3
1.77E-04
12
9/3/2013
1.469
8.42
1.03E-01
0.833
12
9/6/2013
1.814
1.639
6.92
9.46E-05
12

10/7/2013
2.071
12.6
2.18E-01
2.538
12
10/11/2013
1.835
2.069
5.44
9.39E-05
12
11/4/2013
1.845
154
2.37E+00
2.096
12
11/8/2013
1.970
2.006
10.7
1.79E-04
12
12/2/2013
2.151
14.3
2.57E-01
2.22
12
12/5/2013
2.113
2.671
13.4
2.99E-04
12
12/16/2013
2.174
2.295
8.66
1.66E-04
12
1/6/2014
2.503
22
4.59E-01
2.626
12
1/10/2014
2.482
2.719
7.42
1.68E-04
12
2/3/2014
2.172
42.5
7.70E-01
2.489
12
2/7/2014
2.172
2.142
3.92
7.00E-05
12
3/3/2014
2.351
23.3
4.57E-01
2.351
12
3/6/2014
3.044
3.044
7.55
1.92E-04
12
4/1/2014
2.064
5
8.61E-02
2.036
12
4/4/2014
2.037
2.152
10.5
1.88E-04
12
5/5/2014
1.695
8.64
1.22E-01
2.108
12
5/9/2014
2.273
2.628
4.52
9.91E-05
12
6/2/2014
1.937
6.04
9.76E-02
2.085
12
6/6/2014
1.896
1.987
6.82
1.13E-04
12
7/7/2014
1.826
13
1.98E-01
2.143
12
7/11/2014
2.040
2.103
11.4
2.00E-04
12
8/4/2014
1.916
3.3
5.27E-02
2.044
12
8/8/2014
2.239
2.637
15
3.30E-04
12
8/19/2014
1.961
2.349
16.3
3.19E-04
12
8/21/2014
1.924
2.046
11.2
1.91E-04
12
8/22/2014
1.842
2.239
16.7
3.12E-04
12
8/25/2014
1.937
2.285
13.5
2.57E-04
12
8/26/2014
2.011
2.255
9.61
1.81E-04
12
8/27/2014
1.922
2.103
10.1
1.77E-04
12
8/28/2014
1.897
2.001
10.2
1.70E-04
12
8/29/2014
1.914
2.236
12.6
2.35E-04
12
9/3/2014
2.076
7.02
1.22E-01
12
9/8/2014
1.898
2.457
9.8
2.01E-04
12
10/1/2014
Influent
Flow
Meter
Down
5.32
12
10/3/2014
2.32
15.4
2.98E-04
12
10/9/2014
2.064
14.3
2.46E-04
12
10/23/2014
2.118
16.8
2.97E-04
12
Year
Effluent Average [ng/L]
2011
3.05
2012
9.42
2013
6.35
2014
11.18

Industry LL Hg [ng/L]
Year
Month
DTNA
CLARIANT
GP
A&E
Flow [MGD]
LL Hg [ng/L]
LL Hg [Ibs/d]
Flow [MGD]
LL Hg [ng/L]
LL Hg jibs/d]
Flow [MGD]
LL Hg [ng/L]
LL Hg jibs/d]
Flow [MGD]
LL Hg [ng/L]
LL Hg [Ibs/d]
January
0.034
0.000E+00
0.090
0.000E+00
0.098
0.000E+00
0.558
0.000E+00
February
0.044
34.9
1.281E-05
0.102
62.3
5.300E-05
0.109
0.000E+00
0.637
0.000E+00
March
0.044
0.000E+00
0.101
O.000E+00
0.113
0.000E+00
0.646
11.0
5.926E-05
April
0.040
0.000E+00
0.099
0.000E+00
0.091
0.000E+00
0.661
0.000E+00
May
0.046
0.000E+00
0.091
0.000E+00
0.120
0.000E+00
0.651
0.000E+00
June
0.051
O.000E+00
0.092
0.000E+00
0.120
0.000E+00
0.670
0.000E+00
2012
July
0.045
O.000E+00
0.094
O.O00E+00
0.103
0.04
3.436E-08
0.534
0.000E+00
August
0.052
O.000E+00
0.086
35.4
2.539E-05
0.102
O.O00E+00
0.675
O.O00E+00
September
0.046
O.000E+00
0.105
O.000E+00
0.107
O.000E+00
0.549
9.3
4.258E-05
October
0.026
7.6
1.648E-06
0.089
2.9
2.153E-06
0.107
<
2.70
2.409E-06
0.603
2.1
1.056E-05
November
0.038
O.000E+00
0.081
O.000E+00
0.087
0.07
5.079E-08
0.484
O.O00E+00
December
0.029
3.2
7.740E-07
0.089
5.1
3.786E-06
0.065
<
0.50
2.711E-07
0.412
15.7
5.395E-05
January
0.035
O.000E+00
0.095
O.O00E+00
0.086
O.000E+00
0.530
O.000E+00
February
0.040
O.000E+00
0.116
O.000E+00
0.087
O.O00E+00
0.478
O.O00E+00
March
0.044
O.000E+00
0.099
0.000E+00
0.086
O.000E+00
0.520
O.000E+00
April
0.045
O.O00E+00
0.068
0.000E+00
0.090
0.000E+00
0.644
O.000E+00
May
0.062
O.000E+00
0.103
O.000E+00
0.079
0.000E+00
0.659
O.O00E+00
June
0.051
O.000E+00
0.150
O.000E+00
0.092
O.000E+00
0.705
O.000E+00
2013
July
0.051
<
2.0
8.507E-07
0.087
0.000E+00
0.084
<
0.50
3.503E-07
0.880
13.9
1.020E-04
August
0.047
4.1
1.607E-06
0.100
10.6
8.840E-06
0.085
<1
0.50
3.545E-07
0.856
25.1
1.792E-04
September
0.050
23.0
9.591E-06
0.094
14.4
1.129E-05
0.102
<
0.50
4.253E-07
0.800
18.7
1.248E-04
October
0.070
7.3
4.262E-06
0.096
5.8
4.644E-06
0.080
<
0.50
3.336E-07
0.876
<
0.1
3.653E-07
November
0.059
7.4
3.617E-06
0.125
4.6
4.796E-06
0.091
<
0.50
3.795E-07
0.860
7.3
5.200E-05
December
0.048
6.5
2.602E-06
0.129
4.0
4.303E-06
0.092
<
0.50
3.836E-07
0.884
9.9
7.262E-05
January
0.056
<
4.0
1.868E-06
0.143
6.6
7.871E-06
0.088
<
0.50
3.670E-07
0.824
930.0
6.391E-03
February
0.055
5.9
2.706E-06
0.123
11.0
1.128E-05
0.094
<
0.50
3.920E-07
0.879
18.2
1.334E-04
March
0.067
<
4.0
2.235E-06
0.140
5.5
6.422E-06
0.093
<
0.50
3.878E-07
0.856
13.1
9.352E-05
April
0.067
<
4.0
2.235E-06
0.128
6.2
6.619E-06
0.088
<
0.50
3.670E-07
0.947
18.6
1.469E-04
2014
May
0.068
7.3
4.112E-06
0.112
<
4.0
3.736E-06
0.092
<
0.50
3.836E-07
1.027
22.8
1.953E-04
June
0.076
6.0
3.803E-06
0.115
<
5.0
4.796E-06
0.095
<
1.00
7.923E-07
1.112
1.9
1.716E-05
July
0.074
<
4.0
2.469E-06
0.130
<
4.0
4.337E-06
0.088
<
1.00
7.339E-07
1.065
21.6
1.919E-04
August
0.068
<
4.0
2.268E-06
0.130
8.6
9.281E-06
0.113
<
0.50
4.712E-07
0.729
17.1
1.040E-04
September
0.073
6.7
4.067E-06
0.119
<
4.0
3.970E-06
0.105
<
0.50
4.379E-07
1.115
12.6
1.172E-04

Permit Modification Lanituame for Nutrient Allocation
Clariant's Current Permit
The reduction in Clariant's nutrient mass limitations reflect a 90% nutrient allocation transfer of
287 pounds/day Total Nitrogen and 36 pounds/day Total Phosphorus to the City of Charlotte's
proposed Regional WWTP. The allocation transfer and subsequent reduction in Clariant's
nutrient mass limitations will become effective upon the Division's receipt of both (a) an
Engineer's Certificate of Construction Completion for the Charlotte Regional WWTP, and (b)
written notification from Clariant authorizing such nutrient transfer. Clariant's reduced mass
nutrient limitations are based on a 12-month rolling average (refer to Section A.(4)).
Clariant's Proposed Permit
The reductions in Clariant's nutrient mass limitations reflect a 90% nutrient allocation transfer of
287 pounds/day Total Nitrogen and 36 pounds/day Total Phosphorus to the City of Mt. Holly
and the City of Belmont in the following amounts:
City of Mt. Holly: &unds/day of Total Nitrogen an36 unds/day of Total
Phosphorous
City of Belmont: 64 pounds/day of Total Nitrogen and 0 pounds/day of Total
Phosphorous
The allocation transfer and subsequent reduction in Clariant's nutrient mass limitations will
become effective upon the NC Division of Water Quality's receipt of written notification from
Clariant authorizing such nutrient transfer. Clariant's reduced mass nutrient limitations are
based on a 12-month rolling average (refer to Section A.(4)).
Belmont Proposed Permit
The daily limits for'Total Nitrogen and Total Phosphorous set forth in this Permit include the
transfer of 64 pounds/day of Total Nitrogen and 0 pounds/day of Total Phosphorous from the
permit held by CMant Corporation. This transfer reflects the terms of an agreement between
Clariant and the City of Charlotte to reduce and transfer a total of 287 pounds/day Total Nitrogen
and 36 pounds/day Total Phosphorus from the Clariant permit in anticipation of the construction
and operation of the Charlotte Regional WWTP, as described in Clariant's permit.
Notwithstanding the limits set forth in this Permit, Belmont agrees to maintain its discharge such
that the total allocation of nitrogen and phosphorus prescribed by the TMDL for Belmont and Mt
Holly, including the allocation previously permitted to Clariant to Lake Wylie, is met.

Upon receipt of both (a) an Engincer's Certificate of Construction Completion for the Belmont
Wastewater Transfer Liftstation, and (b) written notification from Belmont, the entire Total
Nitrogen and Total Phosphorus allocation within this permit shall be transferred to the Charlotte
Regional W WTP permit (414 poundstday Total Nitrogen and 58 poundstday Total Phosphorus).
It is understood that as condition of this nutrient transfer Belmont will transfer all wastewater
flows currently treated under this permit to Charlotte Mecklenburg Utilities for treatment as
described in the Record of Decision for the Long Creek Regional Wastewater Treatment Plant
Environmental Impact Statement and will cease operation of the facility subject to this permit.
In the event the Charlotte Regional W WTP is not constructed or cannot be constructed, the
putrient allocations described above and the allocation placed in the Mt Holly permit (223 Formamca: Hgmgm
Ibs/day of Total Nitrogen and 36 Ibs/day of Total Phosphorus) from the Clariant permit will
become a permanent allocation to this permit once Belmont has reimbursed Charlotte for the
Nutrient Allocation as described in the Memorandum of Agreement and/or Interlocal Agreement
and provided proof of such reimbursement to NC Division of Water Quality.
Mount Holly Proposed Permit
The daily limits for Total Nitrogen and Total Phosphorous set forth in this Permit include the
transfer of 223 poundstday of Total Nitrogen and 36 poundstday of Total Phosphorous from the
permit held by Clariant Corporation. This transfer reflects the terms of an agreement between
Clariant and the City of Charlotte to reduce and transfer a total of 287 pounds/day Total Nitrogen
and 36 pounds/day Total Phosphorus from the Clariant permit in anticipation of the construction
and operation of the Charlotte Regional W WTP, as described in Clariant's permit.
Notwithstanding the limits set forth in this Permit, Mt. Holly agrees to maintain its discharge
such that the total allocation of nitrogen and phosphorus prescribed by the TMDL for Belmont
and Mt Holly, including the allocation previously permitted to Clariant to Lake Wylie, is met.
Upon receipt of both (a) an Engineer's Certificate of Construction Completion for the Charlotte
Regional W WTP, and (b) written notification from Mt Holly, the entire Total Nitrogen and Total
Phosphorus allocation within this permit shall be transferred to the Charlotte Regional W WTP
permit (523 pounds/day Total Nitrogen and 86 pounds/day Total Phosphorus). It is understood
that as condition of this nutrient transfer Mt Holly will transfer all wastewater flows currently
treated under this permit to Charlotte Mecklenburg Utilities for treatment as described in the
Record of Decision for the Long Creek Regional Wastewater Treatment Plant Environmental
Impact Statement and will cease operation of the facility subject to this permit.
In the event the Charlotte Regional W WTP is not constructed or cannot be constructed, the
putrient allocations described above will become a permanent allocation to the Belmont permit �tted: Hghhght
once Belmont has reimbursed Charlotte for the Nutrient Allocation as described in the

Memorandum of Agreement and/or Interlocal Agreement and provided proof of such
reimbursement to 14C Division of Water Quality.
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Belnick, Tom
From: Belnick, Tom
Sent: Tuesday, May 21, 2013 6:19 PM
To: Nowell, Jackie c
Cc: Templeton, Mike Z y S 101
Subject: CMU Regional Spec for ?? MGD/25 MGD
Jackie- let me know if my summary of TN/TP loads looks correct. If yes, let's move forward with spec with annual mass
load limits for TN/TP, and calculate what average effluent concentrations would be needed to meet these load limits at
the phased flows. The spec letter needs to clearly state how we derived the TN/TP loads. We know they want 25 MGD
ultimate, please call Barry Shearin (704-391-5137) to see if they have decided on Phase 1 as 10 MGD,12 MGD, or 17
MGD. Tell Barry we will send him pre -draft spec to run through the numbers before we mail out official spec. We can
meet before then to review. Thanks.
Mike- please also take a look at numbers. Anything that needs to be changed in numbers or approach?
Mt Holly 300 Ib/d TN 50 Ib/d TP
Belmont 350 Ib/d TN 58 Ib d TP
Clariant 287 Ib/d TN 36 Ib d TP (assumes 90% transfer of 318.5 Ib/d TN and 40 Ib/d TP)
Total: 937 Ib/d TN 1441b/d TP
Total: 342,005lb/yr 52,560lb/yr
Tom Belnick
Supervisor, NPDES Complex Permitting Unit
NCDENR/Division of Water Quality
919-807-6390
E-mail correspondence to and from this address may be subject to the
North Carolina Public Records law and may be disclosed to third parties
1

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Division of Water Quality °�
Fact Sheet for NPDES Permit Modification -Ad AM 's
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Pew r y, yv
Facility Information: NC0004375 (Clariant Corporation)
Applicant/Facility Name:
Clariant Corporation — Mt. Holl
Applicant Address:
P.O. Box 669246, Charlotte, NC 28266
Facility Address:
11701 Mount Holly Rd., Charlotte, NC28214
Permitted Flow:
3.9 MGD Grade IV — Biological)
Type of Waste:
Industrial, Stormwater, and Sanitary Wastewater
Facility/Permit Status:
Permit Modification
County:
Mecklenburg County
Miscellaneous
Receiving Stream:
Catawba River
Stream Classification:
WS-IV-CA
303 d Listed?:
No
Subbasin:
03-08-34
Drainage Area (mi ):
40.8 mi
Summer 7Q 10 (cfs):
329 cfs
Winter 7Q10 (cfs):
NA
Average Flow cfs):
3,016 cfs
IWC % :
1.8 %
Primary SIC Code:
2865
Regional Office:
Mooresville
USGS To o Quad:
Mountain Island Lake & Mount Holly
Permit Writer:
Tom Belnick
Date: .
Aril 12, 2011
Permit Modification
This permit modification reflects a proposed 90% transfer of nutrient allocation (i.e., 287 lbs/day TN, 36 lbs/day TP)
from permittee (Clariant) to a future regional W WTP to be owned/operated by the City of Charlotte. The proposed
regional W WTP will be located on property adjacent to the Clariant facility as part of a future ReVenture "green"
development. Clariant currently discharges to the Catawba River (Lake Wylie) and nutrient loading is governed by a
1996 Lake Wylie TMDL. This proposed permit modification will not add any additional nutrient loading to the lake.
Lake Wylie is not listed as impaired for chlorophyll -a on the 2010 303(d) list.
In order for this permit modification to be activated, the proposed City of Charlotte Regional W WTP still needs to
proceed through the North Carolina SEPA process with a successful outcome, then receive an NPDES permit which
includes the reserve nutrient allocation. The allocation transfer will become effective upon the Division's receipt of
both (a) an Engineer's Certificate of Construction Completion for the regional W WTP, and (b) written notification
from Clariant authorizing such nutrient transfer. Until such time, Clariant's mass nutrient limitations remain
unchanged.
State Contact
If you have any questions on any of the above information or on the attached permit modification, please contact Tom
Belnick at [phone].
Fact Sheet
NPDES Permit Modification (NC0004375)
Page 1

6�ijcv)� 4 j Med7t) #WiWf u-eex.
Permit Modification Lanivage for Nutrient Allocation
Clariant's Current Permit
The reduction in Clariant's nutrient mass limitations reflect a 90% nutrient allocation transfer of
287 pounds/day Total Nitrogen and 36 pounds/day Total Phosphorus to the City of Charlotte's
proposed Regional WWTP. The allocation transfer and subsequent reduction in Clariant's
nutrient mass limitations will become effective upon the Division's receipt of both (a) an
Engineer's Certificate of Construction Completion for the Charlotte Regional WWTP, and (b)
written notification from Clariant authorizing such nutrient transfer. Clariant's reduced mass
nutrient limitations are based on a 12-month rolling average (refer to Section A.(4)).
Clariant's Proposed Permit
The reductions, in Clariant's nutrient mass limitations reflect a 90% nutrient allocation transfer of
287 pounds/day Total Nitrogen and 36 pounds/day Total Phosphorus to the City of Mt. Holly
and the City of Belmont in the following amounts:
City of Mt. Holly: XXX pounds/day of Total Nitrogen and XX pounds/day of Total
Phosphorous
City of Belmont: XXX pounds/day of Total Nitrogen and XX pounds/day of Total
Phosphorous
The allocation transfer and subsequent reduction in Clariant's nutrient mass limitations will
become effective upon the NC Division of Water Quality's receipt of written notification from
Clariant authorizing such nutrient transfer. Clariant's reduced mass nutrient limitations are
based on a 12-month rolling average (refer to Section A.(4)).
Mt. Holly/Belmont Proposed Permit
The daily limits for Total Nitrogen and Total Phosphorous set forth in this Permit include the
transfer of XXX pounds/day of Total Nitrogen and XX pounds/day of Total Phosphorous from
the permit held, by Clariant Corporation. This transfer reflects the terms of an agreement
between Clariant and the City of Charlotte to reduce and transfer a total of 287 pounds/day Total
Nitrogen and 36 pounds/day Total Phosphorus from the Clariant permit in anticipation of the
construction and operation of the Charlotte Regional WWTP, as described in Clariant's permit.
Notwithstanding the limits set forth in this Permit, (Belmont/.Mt. -Holly) agrees to maintain its
discharge such that the total allocation of nitrogen and phosphorus prescribed by the TMDL for

Belmont and Mt Holly, including the allocation previously permitted to Clariant to Lake Wylie,
is met.
Upon receipt of both (a) an Engineer's Certificate of Construction Completion for the (Belmont
Wastewater TJ�nsfer L=iftstation/Charlotte Regional WWTP), and (b) written notification from
i
(Belmorit/llt Dolly), the entire Total Nitrogen and Total Phosphorus allocation within this
permit shall be transferred to the Charlotte Regional WWTP permit (XXX pounds/day Total
Nitrogen and tX pounds/day Total Phosphorus). It is understood that as condition of this
nutrient transfer (Belmont/Mt Holly) will transfer all wastewater flows currently treated under
this permit to Charlotte Mecklenburg Utilities for treatment as described in the Record of
Decision for the Long Creek Regional Wastewater Treatment Plant Environmental Impact
Statement and will cease operation of the facility subject to this permit.
In the event the Charlotte Regional WWTP is not constructed or cannot be constructed, the
nutrient allocations described above will become a permanent allocation to this permit once
(Belmont/Mt Dolly) has reimbursed Charlotte for the Nutrient Allocation as described in the
Memorandum of Agreement and/or Interlocal Agreement and provided proof of such
reimbursement to NC Division of Water Quality.

900 V3' MA be
IWC Calculations YM
N14� �''lOn� o
Facility: ""I�� d !
NCOO�ooq1I���(KcJ9� ocx i�v���'�+�� Tp �ji� S�lPt� �✓ O M �
Prepared By: P�Pa�r�u►, Y
Enter Design Flow (MGD): 6 = /,,,�� � � ���r¢j , _rY�e%t .
Enter s7Q1 0 (cfs): 95 ��(
Enter w7Q10 cfs : 95 ESL} 3 1 A P/� S�
Total Residual Chlorine (TRC)
Daily Maximum Limit (ug/1)
s7Q10 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (UG/L)
Upstream Bkgd (ug/1)
IWC (%)
Allowable Conc. (ug/1)
Fecal Coliform
Monthly Average Limit:
(If DF >331; Monitor)
(If DF<331; Limit)
Dilution Factor (DF)
Ammonia (Summer)
e:Y
�ou0 Le, /►tore
Monthly Average Limit (mg NH3-N/1) AA" aew; w ..
95 s7Q10 (CFS) 95
6 DESIGN FLOW (MGD) 6
9.3 DESIGN FLOW (CFS) 9.3
17.0 STREAM STD (MG/L) 1.0
0 Upstream Bkgd (mg/1) 0.22
8.92 IWC (%) 8. 2
191 Allowable Conc. (mg/1) 9.0
Ammonia (Winter)
Monthly Average Limit (mg NH3-N/1)
w7Q10 (CFS) 95
200/100ml DESIGN FLOW (MGD) 6
DESIGN FLOW (CFS) 9.3
STREAM STD (MG/L) 1.8
11.22 Upstream Bkgd (mg/1) 0.22
IWC (%)
Allowable Conc. (mg/1) 17.9
Total Residual Chlorine
1. Cap Daily Max limit at 28 ug/I to protect for acute toxicity
Ammonia (as NH3-N)
1. If Allowable Conc > 35 mg/I, Monitor Only
2. Monthly Avg limit x 3 = Weekly Avg limit (Municipals); capped at 35 mg/I
3. Monthly Avg limit x 5 = Daily Max limit (Non-Munis); capped at 35 mg/I
4. Lower treatment cap for Minor Domestics: 2 mg/I (summer) and 4 mg/I (winter)
5. Lower treatment cap for Major Municipals: 1 mg/I (year-round)
Fecal Coliform
1. Monthly Avg limit x 2 = 400/100 ml = Weekly Avg limit (Municipals) = Daily Max limit (Non -Muni)
NPDES Server/Current Versions/WLA; TB 1/16/2009