NC0030210_Permit Issuance_20090518

NPDE:C DOCUMENT SCANNINO COVER SHEET
NPDES Permit:
NC0030210
Charlotte / Mallard Creek WWTP
Issuance
Document Type:(Permit
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Meeting Notes
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
May 18, 2009
This document is px-kmted on reuse paper -Ignore any
content oa the resrerse side

`� .:'
. 11CDEN
'North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins
Governor Director
May 18, 2009
Ms. Jacqueline A. Jarrell, P.E.
Environmental Management Division
Charlotte -Mecklenburg Utilities
4222 Westmont Drive
Charlotte, North Carolina 28217
Dee Freeman
Secretary
Subject: Issuance of NPDES Permit NCO030210
Mallard Creek WRF
Mecklenburg County
Dear Ms. Jarrell:
Division personnel have reviewed and approved your application for renewal of the subject
permit. Accordingly; we are forwarding the attached NPDES discharge 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 17,
2007 (or as subsequently amended.)
This final permit includes no major changes from the draft permit sent to you on March 25, 2009.
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 office of Administrative
Hearings, 6714 Mail Service Center, Raleigh, North Carolina 27699-6714. Unless such a demand is
made, this permit shall be final and binding.
Please take notice that this permit is not transferable. The Division may require modification
revocation and reiss 'trance of the permit. This permit does not affect the legal requirements to obtain other
permits which may be required by the Division of Water Quality or permits required by the Division of
Land•Resources, Coastal Area Management Act, or any other Federal or Local governmental permits may
be required.
1617 Mail Service Center,'Raleigh, North Carolina 27699-1617
Location: 512 N. Salisbury St. Raleigh, North Carolina 27604 NOne Carolfria
Phone: [phone] FAX: [phone] Customer Service:1-677-623-6748 atura!!�
Internet: www.ncwaterquality.org
An Equal Opportunity 1 Affirmative Action Employer

If you have questions concerning this permit, please contact Julie Grzyb by e-mail
[e-mail]) or phone at [phone].
Sincerely,
G�7 �
oleen H. Sullins
Enclosures: NPDES Permit NCO030210 and revised fact sheet (dated, May 7, 2009)
cc: EPA/Region
Mooresville Regional Office / Surface Water Protection Section
PERCS/ecopy
Ecosystems Unit/Attn. Jenny Atkins
Aquatic Toxicology Unit
NPDES File (permit and revised fact sheet)
Central Files
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
NonrthCarolina
Location: 512 N. Salisbury St. Raleigh, North Carolina 27604
Phone: [phone] FAX: [phone] Customer Service:1-877-623-6748 Xaturjally
Intemet: www.ncwaterquality.org
An Equal Opportunity 1 Affirmative Action Employer

• Permit NCO030210
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
• DIVISION OF WATER QUALITY
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
I
In compliance with the provisions of North Carolina General Statute 143-215.1, other lawful standards
and regulations I promulgated and adopted by the North Carolina Environmental Management
Commission, and the Federal Water Pollution Control Act, as amended,
Charlotte Mecklenburg Utilities
is hereby authorized to discharge wastewater and stormwater from a facility located at
Mallard Creek Water Reclamation Facility
US Highway 29 North
Northeast of Charlotte
Mecklenburg County
to receiving wateis designated as Mallard Creek in the Yadkin -Pee Dee River Basin in accordance with
effluent limitations, monitoring requirements, and other conditions set forth in Parts I, II, III, and IV
hereof.
The permit shall become effective July 1, 2009.
This permit and the authorization to discharge shall expire at midnight on November 30, 2013.
Signed this day May 18, 2009.
Jeen H. Sullins, Director
Division of Water Quality
By Authority of the Environmental Management Commission
11

Permit NCO030210
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are
hereby revoked, and as of this 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.
Charlotte Mecklenburg Utilities
Mallard Creek Water Reclamation Facility
is hereby authorized to:
1. Continue to operate an existing 12.0 MGD wastewater treatment facility located
at US Highway 29, northeast of Charlotte, Mecklenburg County, consisting of:
• influent pump station
• mechanical bar screens
• two vortex grit removal basins (30 mgd each)
• two flow equalization day tanks
• intermediate pumping station
• five existing primary clarifiers
• biological treatment trains 1 and 2 and 3
• anoxic zones and aeration with internal recycle
• three final clarifiers (additional clarifier to be designed and brought on-line
FY11)
• four traveling bridge tertiary filters
• UV disinfection and re -aeration
• reuse distribution
• anaerobic digesters
• a sludge holding tank
• a waste thickening centrifuge
• sludge drying beds and
• three standby power generators
2. Operate facilities for reclaimed water use of up to 4.0 MGD in accordance with
Non -Discharge Permit number WQ0013252.
3. Reuse non -potable treated effluent for irrigation and dust control on the
property of the Mallard Creek Water Reclamation Facility in accordance with
condition A. (4.) of the permit.
4. Discharge treated wastewater from the facility described in item one above at
the location specified on the attached map through outfall 001 into Mallard
Creek, a class C water in the Yadkin -Pee Dee River Basin.

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CMU - Mallard Creek WRF - NC0030210 Facility
Location: I
Mecklenburg
USGS Quad Name: Harrisburg Lat.: 35°19'52" county
Receiving Stream: Mallard Creek Long.: 80°41'54"
Stream Class: North Not to SCALE
Subbasin: Yadkin - 03f.1711

Permit NCO030210
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - 12.0 MGD
During the period beginning on the effective date of the permit and lasting until expiration, the
Permittee is authorized to discharge up to 12 MGD of municipal wastewater from outfall 001. Such
discharges shall be limited and monitored by the Permittee as specified below:
Parameter
E went Limitations" .
.ffr
.Monitoring;Reauiremenis
Monthly
Average
Weekly , ...
Average
Daily ::
Maximum
Measurement
Frequency
Sample Type
Sample .
Locationl
Flow
12 MGD
Continuous
Recording
Influent or
Effluent
CBOD, 5 day (20°C)2
[April 1— October 31]
4.2 mgll
6.3 mg/i
Daily
Composite
Influent &
Effluent
CBOD, 5 day (20°C)2 I
[November 1 — March 31]
8.3 mgll
12.5 mg/I
Daily
Composite
Influent &
Effluent
Total Suspended Solids
30.0 mgA
45.0 mgll
Daily
Composite
Influent &
Effluent
NH3 as N [April 1— October 311
1.0 m /l
3.0 mg/1
Daily
Composite
Effluent
NH3 as N Nov.'— March 31
2.0 m
6.0 m /l
Daily
Composite
Effluent
Dissolved Oxygen
Daily Average > 6.0 m /L
Daily
Grab
Effluent
Dissolved Oxygen'
3/Week
Grab
Upstream &
Downstream
Fecal Coliforrn eomebic mean
200/100 ml
400/100 ml
Daily
Grab
Effluent
Total Nitrogen 3
Monitor & Report
Monthly
Composite
Effluent
Total Phosphorus
Monitor &Report
Monthly
Composite
Effluent
Temperature °C
Monitor & Report
Daily
Grab
Effluent
Temperature (°C)1
3/Week
Grab
Upstream &
Downstream
Total Zinc
Monitor.& Report
2/Month
Composite
Effluent
Total Mercu
Monitor & Report
2/Month
Composite
Effluent
H i
Between 6.0 and 9.0 Standard Units
Daily
Grab
Effluent
Chronic Toxicity 4 I
See Note 4.
Quarterly
Composite
Effluent
Notes:
1. Sample locations: Upstream at least 200 feet above the discharge point and downstream at NCSR 1300
and at NCSR 1304 (Rocky River). Stream samples shall be grab samples and shall be collected
3/Week during the months of June, July, August, and September and 1 /Week during the
remaining months of the year. Instream monitoring is provisionally waived in light of the
permittee's participation in the Yadkin -Pee Dee River Basin Association. Should the
permittee terminate its participation in the Association instream sampling shall immediately
commence as stated in this permit.
2. The monthly average effluent CBODS and Total Suspended Solids concentrations shall.not exceed
15% of the respective influent value (85% removal).
3. 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.
4. Chronic Toxicity (Ceriodaphnia dubia) P/ F at 90%: February, May, August, November;
See Special Condition A. (2.) of this permit.
THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS.

Permit NCO030210
A. (2.) CHRONIC TOXICITY PERMIT LIMIT (QRTRLY)
The effluent discharge shall at no time exhibit observable inhibition. of reproduction or significant
mortality to Ceriodaphnia dubia at an effluent concentration of 90 %.
The permit holder shall perform at a minimum, quarterlu 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 TGP3B, DWQ Form AT-1 (original) is sent to the below address. If
reporting Chronic Value results using the parameter code THP3B, DWQ Form AT-3 (original) is to be.,
sent to the following address:
Attention: NC DENR / Division of Water Quality
Environmental Sciences Section
1621 Mail Service Center
Raleigh, North Carolina 27699-1621
Completed Aquatic Toxicity Test Forms shall be filed with the Environmental 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 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 Quality 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 morb frequently then required by this permit, the results of
such monitoring shall be included in the calculation and reporting of the data submitted on the DMR
and all AT Forms submitted.
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

' Permit NCO030210
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.
A. (3) EFFLUENT POLLUTANT SCAN
The Permittee shall perform an annual Effluent Pollutant Scan for all parameters listed in the attached
table. The analytical methods shall be in accordance with 40 CFR Part 136 and shall be sufficiently
sensitive to deterrxiine whether parameters are present in concentrations greater than applicable
standards and criteria. Samples shall represent seasonal variations. Unless otherwise indicated,
metals shall be analyzed as "total recoverable."
Ammonia (as N)
Trans-1,2-dichlomethylene
Bis (2-chloroethyl) ether
Chlorine (total residual, TRC)
11-dichbroethylene
Bis (2-chloroisopropyl) ether
Dissolved oxygen
1,2-dichloropropane
Bis (2-ethyihexyQ phthalate
Nitrate/Nitrite
1,3-dichloropropylene
4-bromophenyl phenyl ether
Kjeldahl nitrogen
Ethylbenzene
Build benzyl phthalate
07 and grease
Methyl bromide
2-chbronaphthalene
Phosphorus
Methyl chloride
4-chbrophenyl phenyl ether
Total dissolved soli' s
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-tdchloroethane
1,2-dichlorobenzene
Cadmium
1,1,2-trichloroethane
1,34chlorobenzene
Chronuum
Tdchlomethylene
1,44chlorobenzene
Copper
Vinyl chloride
3,3-ftlorobenzidine
Lead
Add -extractable compounds:
Diethyl phthalate
Mercury
P-chloro-m-creso
Dinreth I phthalate
Nickel
2-chlorophenol
2,44mitrotoluene
Selenium
2,4-dichbrophenol
2,6-dnitrotoluene
Silver
.2,4-dimethylphenol
1,2-diphenyihydrazine
Thallium
4,6-dinitro-o-cresol
Fluomnthene
Zinc
2,4-dinitrophenol
Fluorene
Cyanide
2-nitrophenol
Hexachlorobenzene
Total phenolic compounds
4-nitrophenol
Hexachlorobutadiene
Volatile oroanic compounds:
Pentachlorophenol
Hexachlorocydo-pentadiene
Acxolein
Phenol
Hexachloroethane
Acr&nitrile
2,4,6-tdchlorophenol
Indeno(1,2,3-cd)pyrene
Benzene
Base -neutral compounds:
lsophorone
Bromoform j
Acenaphthene
Naphthalene
Carbon tetrachloride
Acenaphthylene
Nitrobenzene
Chlorobenzene
Anthracene
N-nitrosodl-n-propylamine
Chlorodibromomethane
Benzidine
N-nitrosodimethylamine
Chloroethane
Benzo(a)anthracene
N-nhrosodiphenylamine
2-chlomethylvinyl ether
Benzo(b)pyrene
Phenanthrene
Chloroform
3,4 benzo8uoranthens
Pyrene
Dichlorobromomettiane
Benzo(ghi)perylene
1,2,4-tdchbrobenzene
1,1-dichlomethane
Benzo(k)tiuoranthene
1,2-dichloroethane
I
Bis (2-chloroethoxy) methane
i
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:
NC DENR / DWQ / Central Files
1617 Mail Service Center
Raleigh, NC 27699-1617.

Permit NCO030210
A. (4.) Reuse of Treatment Plant Effluent
The tertiary treated effluent from the Mallard Creek WRF is authorized by the Division for reuse
around the existing wastewater treatment facility provided the following conditions are met:
• The irrigation water will supplement rainfall during dry periods of the year only;
• The effluent applied will be quantified by a meter;
• The maximum application rate shall not exceed 0.25-inch/ hour or 1.0-inch / day;
• No runoff shall occur from the irrigated areas;
• Appropriate notice shall be supplied at the entrance of the facility indicating that the area is
being irrigated with reclaimed water that should not be used for drinking; and
• All irrigation shall occur within the fenced perimeter of the wastewater treatment plant with
controlled public access.

North Carolina ) ss
Mecklenburg County)
ATTN DINA SPRINKLE
NCDENR/DWO/NPDES
1617 MAIL SERVICE CTR
RALEIGH NC 27699-1617
The Charlotte Observer Publishing Co.
Charlotte, NC
Affidavit of Publication
THE CHARLOTTE OBSERVER
REFERENCE: 30045571
6325985 NPDES/Wastewater Per
Before the undersigned, a Notary Public of said
County and State, duly authorized to administer
oaths affirmations, etc., personally appeared,
being duly sworn or affirmed according to law,
doth depose and say that he/she is a
representative of The Charlotte Observer
Publishing Company, a corporation organized and
doing business under the laws of the State of
Delaware, and publishing a newspaper known as The
Charlotte Observer in the city of Charlotte,
County of Mecklenburg, and State of North Carolina
and that as such he/she is familiar with the
books, records, files, and business of said
Corporation and by reference to the files of said
publication, the attached advertisement was
inserted. The following is correctly copied from
the books and files of the aforesaid Corporation
and Publication.
Public Notice
North CarNma Environmental
Management Commi reonlNPOES Unit
1617 Mail Service Center
Raleigh, NC 276a94617
Notice Ct Intent tp Issue a NPDES Wastewater parent
The North Carolina Environmental Management Commission
proposes to issue a NPDES wastewater discharge permit to the
person(.) listed below.
Written comments regarding the proposed permit will be
aaapletl until 36 dayyss alter the publish date W the types. The
Orrector of ma NC Drrivon of Water Quality (DWD) may hold
a pubic nearing shoultl there be a 1/micent degree M public
internal Pweee mad comments antllor iaformetion rewests
m Dw0 at tr
the DWO at
Information on
this rwtice na l
PUBLISHED ON: 03/27 Croy ranmgtE
in a31Y<lD u
in Mcipal ve
municipal d
Dee River BB61
IP6325M5
AD SPACE: 56 LINE
FILED N: OS/13/09
FILE__ _ ____ ____
NAME:
DATE:
In Testimony WhereofV have hereunto set my hand and affixed my seal, the
day and y ar aforesaid. `-
Notary omission Expires:
My Commission Expires May 27, 2011
to
] interval el permit
r proclamation facility
discharge is treated
in the Yadkin -Pee

May 7, 2009
NCDENR/DWQ
F.A.CT SHEET FOR NPDES PERMIT DEVELOPMENT
Charlotte Mecklenburg Utilities
Mallard Creek Water Reclamation Facility
NPDES Permit Number NCO030210
Facility Information
Facility Name:
of Waste:
CMU-Mallard Creek Water Reclamation Facility
----- —.
Domestic and Industrial County:
Mecklenburg
—Type
Permitted Flow (MGD):
; 12.0
Regional Office:
Mooresville
Facility Class: IV
USGS To o Quad:
F16SW _
Pretreatment Program:_
Complete
USGS Quad Name:
Harrisburg
Permit Status:
Renewal
Permit writer:
Julie Grzyb
Primary SIC code:
4952
Date:
March 20, 2009
Stream Characteristics
Receiving Stream.—Mallard
Creek
Drainage Area (nri'):
Summer7�l0�fs)-
Winter 7Q10 (cfs)
37.5
0.64
2.1
Sub -basin: 0307-11
Stream Index Number: 13-17-5
Stream Classification:
30�d� Status:
C
Not Listed
30Q2 (cfs):
Average Flow cfs :
2.9
41_0
305 Status:
Supporting
IWC %:
97a/o
Summary
The Charlotte Mecklenburg Utilities (CMU) operates the Mallard Creek Water Reclamation Facility with a
current permitted flow of 12.0 MGD. The treated domestic (93%) and industrial (7%) wastewaters are
discharged to Mallard Creek in the Yadkin -Pee Dee River Basin. CMU submitted an application for
renewal on May 22, 2008. The permit expired on November 30, 2008 and has been administratively
extended until a new permit is issued.
This facility is located in northeastern Mecklenburg County on the border with Cabarrus County. During
the last permit cycle the facility was expanded from 8 MGD to a 12 MGD plant. The average annual flow
for 2007 was 7.8 MGD with a peak flow of 15.00 MGD. CMU is planning to design and add an additional
final clarifier to firm up the current capacity by FYI1. The average number of gallons per day flowing
into the plant due to inflow and infiltration are estimated at 9,000. CMU has been smoke testing and TVing
collection system lines to determine sources of I and I and taking steps to re -habilitate pipelines.
Mallard Creek's treatment system consists of. an influent pump station, mechanical bar screens, two vortex
grit chambers, flow equalization basins, an intermediate pumping station, five primary clarifiers, three
biological treatment trains with anoxic zones and aeration basins to carry out activated sludge processes,
three final clarifiers, four traveling bridge tertiary filters, UV disinfection and re -aeration, reuse pumping
station, anaerobic digesters, a sludge holding tank, a waste thickening centrifuge, sludge drying beds and
three standby power generators.
CMU has a full pretreatment program through the Division of Water Quality's PERCS Unit for all five
municipalities it operates including the Mallard Creek facility. Mallard Creek receives wastewaters from
two categorical industries: United Technologies Carrier, a metal finisher, and Mallard Creek Polymers
which is regulated under the OCPSF standards. The pretreatment program will continue to be implemented
in accordance with the permit.
Final Version

NPDES Permit Fact Sheet —May 7, 2009 CMU-Mallard Creek WWTP
Page 2 NCO030210
In addition to discharging via NPDES permit number NC0030210, this facility serves as a reclaimed water
distribution facility under non -discharge permit WQ0013252, providing up to 4.0 MGD of reclaimed water
for landscape irrigation. Class B biosolids are land applied in accordance with land application permit
number WQ0000057.
Background and Receiving Stream Information
The facility's discharge takes up essentially all of the available assimilative capacity for oxygen
consuming wastes in Mallard Creek with an IWC of 97% at 12 MGD. Mallard Creek is not listed on the
North Carolina 303(d) Impaired Waters List. Mallard Creek has a summer 7Q10 of 0.64 cfs and
discharges into the Rocky River.
In 1993, the Division of Water Quality completed a calibrated QUAL2E river model focusing on a 42 mile
section towards the upper end of the Rocky River. Three major municipal discharges were considered in
the model: Mooresville WWTP to Dye Creek, Mallard Creek WWTP to Mallard Creek, and Concord
WWTP to Rocky River. The following set of effluent concentrations were obtained for the Mallard Creek
WWTP: DO: 6.0 mg/1, NH3: 1.0 mg/L, BOD5: 5.0 mg/L (4 mg/L CBOD5), and Flow: 6.0 MGD. At
expanded wasteflows, the DO sag is predicted to occur in the Rocky River. Instream DO violations were
not predicted at 8 or 12 MGD. Previous permits recognized that at these increased discharge rates the
wasteflow is driving the hydraulics of the model. Toxicants, as well as potential changes in the stream
channel as wasteflows increase, may be the principal issues as opposed to instream DO concentrations.
Reviewing two years of data on effluent and downstream DO sampling confirms that the DO standard has
not been violated. CMU provided a correlation between BOD5 and CBOD5 at the plant to determine the
CBOD5 limit of 4.2 mg/L.
Compliance Summary
A compliance download was conducted from DWQ's Basinwide Information Management System for the
period January 2007 through December 2008. Two NOV's were issued for an UV system failure and
discharge without adequate disinfection due to a tripped breaker and power outage on 2-28-08 and 3-4-08.
Theoretical estimates provided in a letter from CMU dated 3/28/08 determined that even in a worst case
scenario, weekly and monthly, fecal coliform permit limitations were not exceeded. No other violations
were cited. Inspections in 2008 performed by Wes Bell of the Mooresville Regional Office resulted in a
facility rating of very reliable. No significant problems were found. A review of the facility's effluent
data for the most recent two years indicates excellent treatment with consistent removal rates of CBOD5 >
97%, TSS >94% and D.O. > 6 mg/L in the effluent.
Toxicity Testing
Current Requirement: Chronic Ceriodaphnia Qrtrly P/F @ 90%
Testing during the months of February, May, August and November
Mallard Creek WRF has passed all 18 of its whole effluent toxicity tests for Ceriodaphnia and 4 tests for
Fat Head Minnow during the past four and one-half years.
DWQ recommends that the quarterly chronic Ceriodaphnia toxicity tests at 90% be continued in the
renewed permit.

NPDES Permit, Fact Sheet —May 7, 2009
Page 3 '
Reasonable Potential Analysis (RPA) Results
CMU-Mallard Creek WWTP
NCO030210
Effluent data for toxicants were reviewed for the period January 2007 through December 2008. All
effluent data for cadmium, lead, cyanide, chromium, arsenic, selenium and silver as required under the
pretreatment program were reported as non -detectable. Some small quantities of molybdenum were
reported but most of the samples were less than detectable. No effluent limits or monitoring will be
required with the permit, but CMU will have to continue to monitor these parameters through the
Pretreatment Pr I gram's Long Term Monitoring Plan.
Reasonable potential analyses were conducted for copper, zinc, nickel, and mercury (attached). The results
of these analyses are summarized in the table below.
Paam�eter i
A►�lo1wable_Acute . ::
llowabli4: h6iic
Nickel u
261
91
4.1
Mercury (n
N/A
12
9.4
Copper (ug/L)
7
7
6.8
Zinc (ug/L)
67
52
68
• There is no reasonable potential for a nickel standard violation. No limitation is necessary and
two years worth of data used in the reasonable potential analyses show the maximum predicted
level is considerably lower than the chronic and acute standards. It is recommended that
monito I 'ng for nickel be removed from the NPDES permit. Nickel will remain in the facility's
Pretre=nt Long Term Monitoring Program and will be monitored monthly.
• There is no reasonable potential for a mercury standard violation. No limitation is necessary;
however, monitoring should be maintained in the permit due to Ahe facility's high IWC and its
maximum predicted mercury concentration of 9.4 ng/L as compared to the allowable chronic
concentration of 12 ng/L. Monitoring for mercury is included in the Pretreatment LTMP due to
NPDES requirements and not because of a significant industrial user. Therefore, it is
recommended that the permit be renewed without the mercury limitation and monitoring be
changed from weekly to 2/Month.
• The copper maximum predicted concentration is below the acute and chronic allowable
standards. These allowable standards are Action Level standards and should be reviewed in
conjunction with toxicity testing. In addition, the maximum predicted concentration for copper
has decreased from 29 ug/L in 2004 to 6.8 ug/L in 2008. It is recommended that monitoring for
copper be removed from the NPDES permit. Copper will remain in the facility's Pretreatment
Long Term Monitoring Program and will be monitored monthly.
• The zinc maximum predicted concentration is above the allowable acute and chronic standards
exhibit' rig some reasonable potential for a violation. For this parameter, the standards are Action
Level standards and should be reviewed in conjunction with toxicity testing. It is recommended
that mo iitoring for zinc remain in the NPDES permit at a measurement frequency of 2/Month.
Effluent Pollutant Scans
The application contained data from five annual Effluent Pollutant Scans as required by its permit. No
VOC's, Acid-Extractables and Base -Neutral compounds were shown to be present in the facility's
effluent. An annual priority pollutant scan requirement will remain in the permit to ensure that the
permittee complies with the requirement in the municipal permit applications.

NPDES Permit Fact Sheet —May 7, 2009
Page 4
Proposed Permit Changes
Remove the mercury limitation and reduce monitoring to 2/Month.
Remove monitoring for nickel and copper from the permit.
PROPOSED SCHEDULE FOR PERMIT ISSUANCE
Draft Permit to Public Notice:
Permit Scheduled to Issue:
STATE CONTACT
March 25, 2009
May 18, 2009 (estimate)
CMU-Mallard Creek WWTP
NCO030210
If you have any questions on any of the above information or on the attached permit, please contact Julie
Grzyb at [phone].
Copies of the following are attached to provide further information on the permit development:
• RPA
• Draft Permit
NPDES RECOMMENDATION BY:
Signature Date
REGIONAL OFFICE COMMENTS:
REGIONAL RECOMMENDATION BY:
Signature Date

REASONABLE POTENTIAL ANALYSIS
11
15
CMU - Mallard Creek WWTP
NCO030210
Time Period
0
Qw (MGD)
12
7Q10S (cfs)
0.64
7Q10W (cfs)
2.1
30Q2 (cfs)
2.9
Avg. Stream Flow, QA (cfs)
41
Rec%ft Siem Mallard Creek
WWTP Class IV
iWC (%) @ 7010S 96.674
@ 701OW 89.855
@ 3002 86.512
@ QA 31.208
Stream Class C
Outfall 001
Qw =12 MGD
(TYPE
STANDARDS &
PARAMETER
CRITERIA (2)
PQL
Units
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
N)
NC WQS1 Ye FAV/
Cbmnk Acute
n 0 Det Abx Prnl Cw Aftnble Cw
Acute: 7
Copper
NC
7 AL 7.3
ug/L
112 112
6.8
No reasonable poter ial to exceed acute or chronic sWs.
_ _ _
Chronic: i
Remove monitoring from permit---- — ---�—
Continue monthly monitoring as required in the LIMP.
Acute: N/A
Mercury
j NC
12
2.0000
ng/L
113 103
9.4470
No reasonable potential to exceed acute or_chronic
_ _ _ —12-- _
Chronic: 12 _
_st_ds.
Reduce monitoring from weekly to 2/Mordh.
Acute: 261
Nickel
NC
88 261
ug/L
112 33
4.1
No reasonable potential to exceed acute or chronic stds.,
—
- — _ _ _
Chron—ic: 91
Remove monitoring from permit. -- — s — — _
Continue monthly monitoring as required in the LIMP.
Acute: 67
Zinc
NC
50 AL 67
ug/L
112 112
68.0
Reasonable potential to exceed
_ _ _ _ _ _ _
Chronic: 52
_stds._
No limit as this Is an action level parameter
Maintain monitoring.
'Legend., " Freshwater Discharge
C = Carcinogenic
NC = Non -carcinogenic
A = Aesthetk
30210 rpa results.xls, rpa
5/7/2009

5
5
Zinc
Date
1 Jan. 07
2
3
4
5
6 Feb. 07
7
8
9
10 Mar. 07'
11
12
13
14 Apr. 07
15
16
17
18 May. 07
19
20
21
22
23
24 Jun 07
,11
25
26
27
28
29 Jul. 07
30
31
32
33
34 Aug. 07
35
36
37
38
39 Sept. 0
40
41
42
43 Oct. 07
44
45
46
47
48 Nov. 07
49
50
51
52 Dec. 07
53
54
55
Data
7
BDL=112DL
Results
2.8
2.8
Std Dev.
2s
2.5
Mean
3.6
3.6
C.V.
2.4
2.4
n
A
2.7
2.7
2.3
2.3
Mult Factoi
2.9
2.9
Max. Value
`u
3.2
3.2
Max. Pred
a.z
3.2
Is
2.8
y
3
2.9
2.9
°
3.3
3.3
iN
t '
2.7
2.7
2.6
2.6
3.
3.0
2.2
2.2
3.2
3.2
t
2.6
2.6
3.2
3.2
3.2
3.2
3.4
3.4
F
2.9
2.9
3.7
3.7
4.1
4.1
s
a °
3.2
3.2
"..:
3.e
3.8
3.3
3.3
;y,'
2.8
2.8
3.4
3.4
3.1
3.1
2.6
2.6
3.7
3.7
3.7
3.7
4.5
4.5
4.8
4.8
5.6
5.6
4.7
4.7
4.
4.0
5.2
5.2
5.2
5.2
3.9
3.9
3.8
3.8
3.9
3.9
4.6
4.6
3.4
3.4-
3.1
3.1
3.3
3.3
2.6
2.6
2.7
2.7
5.1
5.1
2.1
2.1
0.9473
3.4366
0.2756
112
1.1700
5.8 ug/L
6.8 ug/L
3.5 3.5 Copper cont. on back
3.3
3.3
2.7
2.7
2.6
2.6
Date
1 Jan:
2
3
4
5
6 Feb.
7
8
9
10 Mar.
11
12
13
14 Apr.
15
16
17
18 May.
19
20
21
22
23
24 Jun.
25
26
27
28
29 Jul.
30
31
32
33
34 Aug.
35
36
37
38
39 Sept.
40
41
42
43 Oct.
44 .
45
46
47
48 Nov.
49 -
50
51
52 Dec.
53
54
55
56 Jan.
Data
BDL=1/2DL Results
31. 31.0 Std Dev.
33. 33.0 Mean
35. 35.0 C.V.
34. 34.0 n
39. 39.0
33. 33.0 Mult Factoi
42. 42.0 Max. Value
40. 40.0 Max. Pred
37. 37.0
52 52.0
48. 48.0
46. 46.0
42. 42.0
36. 36.0
38. 38.0
32. 32.0
45. 45.0
40. 40.0
38. 38.0
39. 39.0
35. 35.0
41. 41.0
41. 41.0
43 43.0
40. 40.0
42. 42.0
39. 39.0
35. 35.0
40. 40.0
45. 45.0
37. 37.0
45. 45.0
42 42.0
45. 45.0
aa. 44.0
48. 48.0
63. 63.0
41, 41.0
49. 49.0
53. 53.0
49. 49.0
48. 48.0
46. 46.0
58. 58.0
53. 53.0
50. 50.0
48. 48.0
42. 42.0
49. 49.0
50. 50.0
47. 47.0
41. 41.0
5.9061
41.7321
0.1415
112
1.0800
63.0 ug/L
68.0 ug/L
49. 49.0 Zinc Cont. on back
45. 45.0
45. 45.0
42. 42.0

56 Jan.
57
58
59
60
61
62 Feb.
63
64
65
66 Mar.
67
68
69
70 Apr.
71
72
73
74
75 May.
76
77
78
79
80 Jun.
81
82
83
84 Jul.
85
86
87
88
89
90 Aug.
91
92
93
94
95 Sept.
96
97
98
99
100 Oct.
101
102
103
104 Nov.
105
106
107
108 Dec.
109
110
111
112
2.4
2.4 Copper cont.
57 u'{
37.
37.0
2.4
2.4
58
50.
50.0
3.1
3.1
59
48.
48.0
2.7
2.7
60
43.
43.0
2.
2.0
61
48.
48.0
2.2
2.2
62 Feb. 08,
38.
38.0
2.6
2.6
63
45.
45.0
2.4
2.4
64
44.
44.0
2.3
2.3
65
41.
41.0
2.6
2.6
66 Mar. 08
46.
46.0
3.
3.0
67
41.
41.0
3.4
3.4
68
36.
36.0
2.4
2.4
69
41.
41.0
2.5
2.5
70 Apr. 08
41.
41.0
3.
3.0
71
39.
39.0
2.
2.0
72
38.
38.0
2.6
2.6
73
50.
50.0
2.5
2.5
74
39.
39.0
2.2
2.2
_
75 May. 08
38.
38.0
2.4
2.4
76
39.
39.0
2.4
2.4
77
35.
35.0
2.3
2.3
78
44.
44.0
3.5
3.5
79
50.
50.0
3.9
3.9
80 Jun. 08'` "
38.
38.0
4.5
4.5
81
44.
44.0
4.9
4.9
82 r_
37.
37.0
4.
4.0
83 1
35.
35.0
3.5
3.5
84 Jul. 08 �,
44.
44.0
4.3
4.3
85 '; ""
40.
40.0
4.7
4.7
86
34.
34.0
4.6
4.6
87
aa.
43.0
5.3
5.3
88
41.
41.0
5.8
5.8
89
43.
43.0
4.9
4.9
90 Aug. 08..
43.
43.0
4.9
4.9
91
42,
42.0
4.9
4.9
92
52.
52.0
4.9
4.9
93
36.
36.0
4.7
4.7
94
3s.
35.0
4.1
4.1
95 Sept. 06
37.
37.0
5.2
5.2
96
31.
31.0
5.6
5.6
97
37.
37.0
4.9
4.9
98
35.
35.0
4.3
4.3
99
34.
34.0
3.4
3.4
100 Oct. 08
36.
36.0
3.6
3.6
101
W.
38.0
4.
4.0
102
36.
36.0
3.7
3.7
103
44.
44.0
4.
4.0
104 Nov. 08
44.
44.0
3.9
3.9
105
38.
38.0
3.7
3.7 -
106
37.
37.0
2.5
2.5
107
45.
45.0
3.4
3.4.
108 Dec. 08
32.
32.0
2.2
2.2
109
40.
40.0
3.3
3.3
110
49.
49.0
2.9
2.9
111
39.
39.0
2.9
2.9
112
34.
34.0
3.
3.0
Zinc continued

RPA
RPA
Mercury
Date Data
BDL=1/2DLResults
1 Jan. 07,
1.6
1.0
Std Dev.
2
1.2
1.0
Mean
3 i
1.9
1.0
C.V.
4
1.5
1.0
n
5
1.7
1.0
6 Feb. 07, ,;;;
1.9
1.0
Mult Factor
7 pj
3.4
3.4
Max. Value
8 `i
2.6
2.6
Max. Fred C
9
2.9
2.9
10 Mar. 07
2.1
2.1
11
3.9
3.9
12
2.6
2.6
13
1.9
1.0
14 Apr. 07 -
1.7
1.0
15 '
2.1
2.1
16
1.6
1.0
17
2.3
2.3
18 May. 07
1.5
1.0
19 ':
2.2
2.2
20
2.1
2.1
21
2.8
2.8
22
1.8
1.0
23
2.4
2.4
24 Jun. 07 `. '°
6.0
6.0
25
2.8
2.8
26
3.0
3.0
27
2.8
2.8
28
1.6
1.0
29 Jul. 07 ' `
2.2
2.2
30
2.2
2.2
31
1.3
1.0
32
1.4
1.0
33 Aug 07
1.4
1.0
34
1.6
1.0
35
1.7
1.0
36 k`
1.6
1.0
37 "''
1.4
1.0
38
1.7
1.0
39 Sept 07 <
2.0
2.0
40
2.4
2.4
41
2.0
2.0
42
1.6
1.0
�c
43 Oct. 07 `,ii
4.7
4.7
44
1.6
1.0
45
2.2
2.2
46
1.4
1.0
47 4
1.6
1.0
48 Nov 07
1.4
1.0
49
2.0
2.0
50 N1.4
1.0
51 :'
1.0
1.0
52 Dec 07".`
1.8
1.0
53
1.6
1.0
54 u '
1.6
1.0
0.9944
1.5221
0.6533
113
1.41
6.7
9.4
Date Data
1 Jan 07 „<
2 <'
3<
4
5
6 Feb. 07 tM<,
7 :<
8
9
10 Mar. 07 :,5
11
12 <'
13 <
14 Apr. 07 <_ !
15
16 <'
17 <
18 May. 07 <
19 <
20
21 <
22
23 "'<
24 Jun. 07
25
26
27 <' ;
28 <.
29 Jul. 07 ".
30
31
32 <
33 <
34 Aug 07 ,<
35 '<<;
36 ,<
37 < `J
38 <
39 Sept 07 <
40 `<
41
42 k<
43 Oct. 07
<.
44 a
45 G$,
46
47
48 Nov 07
49
50'
51
52 Dec 07,=r.;
53 ' "a s
Nickel
BDL=1/2DL Results
2 1.0 Sid Dev.
2 1.0 Mean
2 1.0 C.V.
2.4 2.4 n
2 1.0
2 1.0 Mult Factoi
2 1.0 Max. Value
2 1.0 Max. Fred
3 2.7
2 1.0
2 2.2
2 1.0
2 1.0
2 1.0
2 1.0
2 1.0
2 1.0
2 1.0
2 1.0
3 1.3
2 1.0
2 2.4
2 1.0
2 1.0
2 2.3
2 2.4
2 1.0
2 1.0
2 2.2
2 2.1
3 2.6
2 1.0
2 1.0
2 1.0
2 1.0
2 1.0
2 1.0
2 1.0
2 1.0
2 1.0
2 1.0
2 1.0
2 1.0
2 1.0
2 1.0
2 1.0
2 1.0
2 1.0
3 3.2
2 2.0
2 1.0
2 2.1
3 2.6
0.6079
1.3910
0.4370
111
1.2800
3.2 ug/L
4.1 ug/L
z" Mercury cont. on back
55 1.5 1.0 54
56 1.3 1.0 55
2 . t0
5 2.5
Zinc cont. on back

Mercury continued
Zinc continued
57 Jan. 08
58
59
60
61
62
63 Feb. 08
64.
65
66
67 Mar. 08
68
69
70
71 Apr. 08
72
73
74
75
76 May. 08
77
78
79
80
81 Jun. 08
82
83
84
85 Jul. 08
86
87
88
89
90
91 Aug. 08
92
93
94
95
96 Sept. 08
97
98
99
100 Oct. 08
101
102
103
104
105 Nov. 08i
106
107
108
i
109 Dec. O8
110 s
111 �
112
113
1.4
1.6
1.4
1.1
1.2
1.5
1.3
1.2
1.6
2.0
2.0
1.6
1.7
1.7
6.7
1.6
1.5
1.6
1.9
2.8
1.7
2.2
1.8
1.7
2.0
2.4
2.6
1.9
1.5
1.9
1.4
1.0
1.6
1.0
1.0
1.4
1.3
1.8
1.1
1.1
1.2
1.0
2.6
1.1
1.1
1.0
1.1
1.0
1.0
1.2
1.0
1.0
1.5
2.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
2.0
2.0
1.0
1.0
1.0
6.7
1.0
1.0
1.0
1.0
2.8
1.0
2.2
1.0
1.0
2.0
2.4
2.6
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
2.6
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
2.0
1.0
1.0
1.0
56 Jan. 08
2
1.0
57
2
1.0
58
2
1.0
59
2
1.0
60
2
1.0
61
2
1.0
62 Feb. 08
2
1.0
63
2
1.0
64
2
1.0
65
2
2.0
66 Mar. 08
2
1.0
67
2
1.0
68
2
1.0
69 £'"
2
2.3
70 Apr. 08 ,
2
2.0
71
2
2.1
72
2
2.2
73
3
2.5
74
2
2.4
75 May. 08
2
2.3
76 of 'C 4
2
2.2
77
2
2.2
78
2
2.1
79
2
2.2
80 Jun. 08
3
2.6
81
2
2.2
82
2
2.0
83
2
1.0
84 Jul. 08
2
1.0
85 c
2
1.0
86
2
1.0
87
2
1.0
88
2
1.0
89
2
2.0
90 Aug. 08
2
2.0
91-
2
1.0
92
2
2.2
93 .
2
2.2
94
2
1.0
95 Sept. 08
2
1.0
96
2
1.0
97
2
1.0
98
2
2.0
99
2
1.0
100 Oct. 08
2
1.0
101
2
1.0
102
2
1.0
103
2
1.0
104 Nov. 08
2
1.0
105
2
1.0
106
2
1.0
107
2
1.0
108 Dec. 08
2
1.0
109
2
1.0
110
2
1.0
111
2
1.0
112
2
1.0

i
re Mallard Creek WRF, NCO031) 210
Subject: re Mall . d Creek'AW, NCO030210
ar, h From: [e-mail]
Date: Wed, l Ap 2009 09:00:43 -0400
To: julie.grzyb cmail.net
EPA has no comments on this draft permit.
1 of 1 4/16/2009 6:10 PM

•
CHARLOTTE..
Julie Grzyb
Environmental Engineer
NPDES West / DWQ
NC DENR
1617 Mail Service Ctr.
Raleigh, NC 27699-1617
Re: Residuals Management Plants for:
Mallard Creek WMF. NPDES #NC0030210
McDowell Creek WWTP, NPDES #NC0036277
Dear Ms. Grzyb,
Solids removed in these treatment facilities are digested using anaerobic digesters and
then dewatered on -site. The dewatered residuals are stored in a designated storage area
until they are removed by our contractor, Synagro.
Biosolids in NC are land applied in North Carolina under permit #WQ0000057 for Class
B solids and Permit #WQ0006497 for Class A solids. In South Carolina Class B solids
are land applied under the SCDHES Permit #ND0080900. During the latest year no class
A solids were generated.
When Biosolids did not meet the Class B requirements, the residuals were disposed of at
local landfills.
Please let me know if you need any further information about the residuals management
program.
Thank you,
Dawn Padgett
CMU-EMD
Water Quality Program Administration
RECEIVED
DENR - WATER QUALITY
POINT SOURCE BRANCH
CHARLOTTE-MECKLENBURG UTILITIES
Environmental Management Division 4222 Westmont Drive
Charlotte, NC 28217
Phone: [phone]

To: Western NPDES Unit
Surface Water Protection Section
Attention: Susan Wilson
Date: June 5, 2008
SOC PRIORITY PROJECT: No
1� JUN 9 2008 it
i
NPDES STAFF REPORT AND RECOMMENDATION___ ._
County: Mecklenburg
Permit No. NCO030210
7 day review
PART I - GENERAL INFORMATION
Physical Address
Facility and address: Mallard Creek WWTP 12400 US Hwy. 29 North
Charlotte Mecklenburg Utilities Charlotte, NC 28262
4222 Westmont Drive
j Charlotte, NC 28217
2. Date of:investigation: June 4, 2008
3. Report prepared by: Michael L. Parker, Environmental Engineer I1
4. Person(s) contacted and telephone number: Dawn Padgett, [phone], Darrell Dewitt,
ORC [phone]
5. Directions to site: From the intersection of Highway 29 and Bruton Smith Boulevard in
southwestern Cabarrus County, travel southwest on Highway 29 (cross into Mecklenburg
Co.) =I.I miles. The entrance to the WWTP will be on the left side of Hwy. 29 via a paved
access road (look for large, blue sign).
6. Discharge point(s). List for all discharge points:
Latitude: 350 19' 52" Longitude: 80° 41' 54"
Attach U.S.G.S. map extract and indicate treatment facility site and discharge point on
map.
U.S.G.S!. Quad No.: F16SW U.S.G.S. Name: Harrisburg, NC
Site size and expansion are consistent with application? There is additional area available
for future expansion, if necessary.
Page I

Page Two
8. Topography (relationship to flood plain included): The WWTP is located on a moderately
sloped site. The facilities were designed for protection from the 100-year flood.
9. Location of nearest dwelling: The nearest dwellirg is - 500+ feet from the site.
10. Receiving stream or affected surface waters: Mallard Creek
a. Classification: C
s
b. River basin and subbasin no.: Yadkin 030711
C. Describe receiving stream features and pertinent downstream uses: The stream is
approximately 30 to 40 feet wide with sandy to gravel bottom. The downstream uses
appear to be consistent with typical Class C classifications.
PART II - DE CRIPTION OF DISCHARGE AND TREATMENT WORKS
1. a. Volume of wastewater to be permitted: 12.0 MGD. CMU is also authorized to
discharge up to 3.0 MGD of reuse water through outfall 002.
b. What is the current permitted capacity of the wastewater treatment facility? 12.0
GD (outfall 001), 3.0 MGD (outfall 002)
C. Actual treatment capacity of the current facility (current design capacity)? 12.0
MGD (outfall 001)
d.Date(s) and construction activities allowed by previous Authorizations to Construct
i sued in the previous two years: There have been no ATCs issued for this facility in
e past two years. The permittee has plans to add an additional secondary clarifier
by 2011.
e. Please provide a description of existing or substantially constructed wastewater
treatment facilities: The current facilities at outfall 001 consist of an influent pump
station, a 5 MG flow equalization basin with mechanical aeration, mechanically
cleaned bar screens, aerated (vortex) grit chambers, 5 primary clarifiers, 4 aeration
basins associated with four anaerobic chambers for BNR, two round aeration basins,
3 final clarifiers, dual tertiary traveling bridge filters, UV disinfection, anaerobic
digesters, alkaline chemical feed system, centrifuge dewatering, and stand-by power.
There are existing sludge drying beds, however, they are not in use nor are there any
plans to use them. The two existing trickling filters are not in service and there are no
plans to place them in service. There are no treatment facilities that serve outfall 002
other than those described in Part Il (e) above.

Page Three
f. Please provide a description of proposed wastewater treatment facilities: There are
no proposed WWT facilities at this time, however, the permittee has plans to add an
additional secondary clarifier to this facility by 2011.
g. Possible toxic impacts to surface waters: There has been no toxicity testing failures
in the past 5 years.
l
h. Pretreatment program (POTWs only): This facility has an approved pretreatment
program.
2. Residuals handling and utilization/disposal scheme:
a. If residuals are being land applied, please specify DWQ permit no.. WQ000057
Residuals contractor: Synagro
Telephone No.: 336-766-0328 (main office)
b. Residuals stabilization: The residuals are stabilized in anaerobic digesters,
dewatered, and then stored until disposal. The residuals meet all Class B
biosolids criteria prior to disposal. If Class B criteria cannot be met, the residuals
are taken to various landfills permitted by the Division of Solid Waste for
disposal.
i
C. Landfill: Grit chamber residuals and bar screenings are hauled to a landfill
operated by Allied Waste (formally BFI).
3. Treatment plant classification: Class IV.
4. SIC Code(s): 4952 Wastewater Code(s): 01 Main Treatment Unit Code: 01103
PART III - OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction Grant Funds or are any public monies
involved (municipals only)? Public monies were used in the construction of the existing
WWT facility and will be used in any future expansion.
2. Special monitoring or limitations (including toxicity) requests: A request was received
during the site visit to delete the permit limit and monitoring for mercury. Plant
personnelindicate that few if any detections for mercury have been found, and when
i detection s found, it is typically well below the water quality standard. A request from
the permittee to remove this limit and/or monitoring should be forthcoming.
Page 3

Page Four
Important SOC or Compliance Schedule dates: This facility is not under a SOC nor is
one being considered at this time.
4. Alternative Analysis Evaluation: N/A
Spray Irrigation: CMUD has authorization to recycle 3.0 MGD of effluent via spray
irrigation at a local golf course (outfall 002).
PART IV - EVALUATION AND RECOMMENDATIONS
CMU (Charlotte Mecklenburg Utilities) has requested that the subject permit be renewed.
During the term of the current permit, CMU has increased the permitted capacity of this facility
from 8.0 to 12.0 MGD. The existing facilities should be capable of meeting the current permit
limitations, however, if at some point nutrient limitations are applied to this facility, additional
treatment may be necessary.
Pending a final review and approval by the NPDES Unit, it is recommended that the
permit be renewed as requested. Upon renewal, the effluent limits for 8.0 MGD (as contained in
the current permit) should be removed.
7IS*a of Report Preparer D to
/J IL- GAs/0�
Water Quality Regional Supervisor Date
hAdsr\dsr0Mma11ard. doc

NPDES/A uifer Protection Permitting Unit Pretreatment Information Request Form
PERMIT WRITER COMPLETES THIS PART: PERMIT WRITERS - AFTER you get this form
Date of Request 2/26/2009 municipal renewal
Re uestor Julie Grzyb new industries
Facility Name CMU Mallard Creek WWTP expansion
Permit Number NCO030210 Speculative limits
Region MRO stream reclass.
,Basin Yadkin -Pee Dee stream relocation
7Q10 change
check applicable PERCS staff:
'NI- Notify PERCS if LTMP/STMP data we said should
x I be on DMRs is not really there, so we can get It for
you (or NOV POTW).
- Notify PERCS if you want us to keep a specific
POC in LTMP/STMP so you will have data for next
permit renewal.
- Email PERCS, draft permit, fact sheet, RPA.
- Send PERCS paper copy of permit (w/o NPDES
boilerplate), cover letter, final fact sheet. Email RPA
If changes.
CTB, CHO, LUM, NEW, ROA - Dana Folle 523 Application lists zero non -categorical SIU's and
HIW, LTN, N U, YAD - Monti Hassan 371 two CIU's - Mallard Creek Polymers and United Tech. Carrier
BIRD, CPF, FRB, TAR - Sarah Morrison (208) organic chemicals, plastics../metal finishing
L
PERCS PRETREATENT STAFF COMPLETES THIS PART:
Status of Pretreatme t Program (check all that apply)
1) facility ha no SIU's, does have Division approved Pretreatment Program that is INACTIVE
2) facility ha no SIU's, does not have Division approved Pretreatment Program
3) facility ha SIUs and DWQ approved Pretreatment Program (list "DEV' if program still underdevelopment)
3a) Full Program with LTMP
3b) Modli ed Program with STMP
4) additional ,conditions regarding Pretreatment attached Or listed below JSTMUme
st nt:
Flow, GD Permitted Actual Time period for Actual ext cle: IV
Indt strial 4. i S 0 6a610�
Uncontro lable n/a �+. 1-4
POC due to
POC In
Parameter of
NPDES/ Non-
Required
POTw POC
P
jEuent
LTMP
LTMP/
Concern (POC)
Disch Permit
Required
by 603
POC due
(Explain
Effluent
S P
Check List
Limit
b EPA•
Slud e•'
to SIU'*•
below)""'*
Fre
4WG�:� ��5���7L"llLl'LJ•1
r
Cyanide V 4 Q M all data on DMRs?
Lead'_._._. ' : Q M YES
Mercury ✓ ✓ I Q M NO (attach data)l
V I Silver ✓
Selenium I Q Im
zinc,-`" " ✓ 4 Q M data inspreadsheet?
✓ Total Nitrogen I QM YES (email to writer
NO
Q M
Q M
4 Q M
prays in the LT�IIP/S, P ** Only in LTMP/STMP if sludge Ian pp or composte (dif POCs for incinerators)
Only In LTMP/STMP while SIU still discharges to POTW **** Only in LTMP/STMP when pollutant is still of concern to POTW
Mallard Creek NPDES PretreatmenLrequestfbrm.feb2008
Revised: July 24.2007 i

01
IWC Calculations
CMU - Mallard Creek WWTP
NC0030210
Permit writer: Julie Grzyb
Enter Design Flow (MGD): 12
Enter s7Q10 (�s): 0.64
Enter w7Q10 (cfs): 2.1
Total ResidualChlorine (TRC)
Ammonia (Summer)
Daily Maximum Limit (ug/l)
Monthly Average Limit (mg NH3-N/1)
s7Q10 (CFS)
0.64
s7Q10 (CFS)
0.64
DESIGN FLOW (MGD)
12
DESIGN FLOW (MGD)
12
DESIGN FLO (CFS)
18.6
DESIGN FLOW (CFS)
18.6
STREAM STD UG/L)
17.0
STREAM STD (MG/L)
1.0
Upstream Bkgd (ug/l)
0
Upstream Bkgd (mg/1)
0.22
IWC (%)
96.67
IWC (%)
96.67
Allowable Conc. (ug/1)
18
Allowable Conc. (mg/1)
1.0
Ammonia (Winter)
Monthly Average Limit (mg NH3-N/1)
Fecal Coliform
w7Q10 (CFS)
2.1
Monthly Average
Limit:
200/100ml
DESIGN FLOW (MGD)
12
(If DF >331; Monitor)
DESIGN FLOW (CFS)
18.6
(If DF<331; Lima)
STREAM STD (MG/L)
1.8
Dilution Facto
(DF)
1.03
Upstream Bkgd (mg/1)
0.22
IWC (%)
89.86
j
Allowable Conc. (mg/1)
2.0
Total Residual Chlorine
1. Cap Daily Mai limit at 28 ug/I to protect for acute toxicity
Ammonia as NH3-N
1. If Allowable one > 35 mg/l, Monitor Only:
2. Monthly Avg I mit x 3 = Weekly Avg limit (Municipals); capped at 35 mg/I
3. Monthly Avg I Imit x 5 = Daily Max limit (Non-Munis); capped at 35 mg/l
4. BAT for Minor Domestics: 2 mg/I (summer) and 4 mg/I (winter)
5. BAT for Major Municipals: 1 mg/I (year-round)
Fecal Coliform
1. Monthly Avg lilmit x 2 = 400/100 ml = Weekly Avg limit (Municipals) = Daily Max limit (Non -Muni)
NPDES Server/Current Versions/WLA; TB 1/16/2009
I

•
IvyF.1INr.��
May 19, 2008
NCDENR/D WQ
Attn: NPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
RE: NPDES Permit Application for Mallard Creek WRE
NPDES Permit #NC0030210
Dear Point Source Unit:
Please find enclosed the original and two copies of the NPDES Permit Application for
Mallard Creek WRF, NPDES Permit #NC0030210. This application is for the renewal of
the current NPDES Permit that expires on November 30, 2008.
Please note that the expanded effluent testing data is a summary of the data gathered from
January 1, 2005 — March 31, 2008. There are four attachments with this application.
Attachment #1 shows the facility and a one mile radius as required by Section E.2.
Attachment #2 is the process flow diagram required by Section 13.3. Attachment #3
completes the treatment description required in Section A.I La. and includes a summary
of the attachment required in Section E.3. Attachment #4 includes copies of all of the
toxicity results (both daphnia and fat head minnow) for the past 4 '/Z years.
Please let me know is there are any issues with the permit application, or if you have any
questions. If there are any questions, please give me a call at 704/336-4460. If I am not
available, please call Dawn Padgett at 704/336-4448 or Darrell Dewitt at 704/547-0680.
Thank you for your assistance,
c L- c. 14 CY7_d
/ ` Jacqueline A Jarrell,l�.
'� Su erintendent
P
Environmental Management Division
Charlotte Mecklenburg Utilities
4222 Westmont Dr.
Charlotte, NC 28217
CHARLOTTE-MECKLENBURG UTILITIES
Environmental Management Division 4222 Westmont Drive
Charlotte, NC 28217
Phone: [phone]

FACILITY NAME AND PERMIT NUMBER:
PERMIT ACTION REQUESTED:
RIVER BASIN:
Mallard Creek WRF, NCO030210
Renewal
Yadkin-PeeDee
SUPPLEMENTAL APPLICATION INFORMATION
PART RINDUSTRIAL USER DISCHARGES AND RCRA/CERCLA WASTES
All treatment works receiving discharges from significant industrial users or which receive RCRA,CERCLA, or other remedial wastes must
complete part F.
GENERAL INFORMATION:
F.1. Pretreatment program. Does the treatment works have, or is subject to, an approved pretreatment program?
X Yes ❑ No
F.2. Number of Significant Industrial Users (SIUs) and Categorical Industrial Users (CIUs). Provide the number of each of the following types of
industrial users that discharge to the treatment works.
a. Number of non -categorical SlUs. 0
b. Number of ClUs. 2
SIGNIFICANT INDUSTRIAL USER INFORMATION:
Supply the following information for each SIU. If more than one SIU discharges to the treatment works, copy questions F.3 through Re and
provide the information requested for each SIU.
F.3. Significant Industrial User Information. Provide the name and address of each SIU discharging to the treatment works. Submit additional pages
as necessary.
Name: Mallard Creek Polymers
Mailing Address: 14700 Mallard Creek Rd.
Charlotte NC 28262
FA. Industrial Processes. Describe all the industrial processes that affect or contribute to the SIU's discharge.
This facility manufactures styrene / butadiene emulsion Polymer. These are products used in adhesive textile and specialty applications.
F.5. Principal Product(s) and Raw Material(s). Describe all of the principal processes and raw materials that affect or contribute to the SI U's
discharge.
Principal product(s): Styrene 11.3 Butadiene (SBR) Latex
Raw materal(s): Styrene. 1.3 butat iene, surfactants and water
F.6. Flow Rate.
a. Process wastewater flow rate. Indicate the average daily volume of process wastewater discharge into the collection system in gallons per
day (gpd) and whether the discharge is continuous or intermittent.
61,000 gpd (xx continuous or intermittent)
b. Non -process wastewater flow rate. Indicate the average daily volume of non -process wastewater flow discharged into the collection system
in gallons per day (gpd) and whether the discharge is continuous or intermittent.
1.530 gpd (xx continuous or intermittent)
F.7. Pretreatment Standards. Indicate whether the SIU is subject to the following:
a. Local limits X Yes ❑ No
b. Categorical pretreatment standards X Yes ❑ No
If subject to categorical pretreatment standards, which categoryand subcategory?
40 CFR Part 414
EPA Forte 3510-2A (Rev. 1-99). Replaces EPA fortes 7550-e & 7550-22. Page 18 of 22

FACILITY NAME AND PERMIT NUMBER:
PERMIT ACTION REQUESTED:
RIVER BASIN:
Mallard Creek WRF, NCO030210
Renewal
Yadkin-PeeDee
F.8. Problems at the Treatment Works Attributed to Waste Discharge by the SIU. Has the SIU caused or contributed to any problems (e.g.,
upsets, interference) at the treatment works in the past three years?
❑ Yes X No If yes, describe each episode.
SIGNIFICANT INDUSTRIAL USER INFORMATION:
Supply the following information for each SIU. If more than one SIU discharges to the treatment works, copy questions F.3 through F.8 and
provide the information requested for each SIU.
F.3. Significant Industrial User Information. Provide the name and address of each SIU discharging to the treatment works. Submit additional pages
as necessary.
Name: United Technologies Carrier
Mailing Address: 9701 Old Statesville Rd.
Charlotte, NC 28269
FA. Industrial Processes. Describe all the industrial processes that affect or contribute to the SIU's discharge.
Painting, machining assembly. welding shipping and receiving and other activities
F.5. Principal Product(s) and Raw Material(s). Describe all of the principal processes and raw materials that affect or contribute to the SIU's
discharge.
Principal product(s): Industrial Chillers
Raw material(s): Steel cooper, welding rods aluminum mfrigemnts, wiring kits ore -manufactured kits, oils, coolants, cleaners and
insulation glue.
F.6. Flow Rate.
C. Process wastewater flow rate. Indicate the average daily volume of process wastewater discharge into the collection system in gallons per
day (gpd) and whether the discharge is continuous or intermittent.
14,200 gptl (XX continuous or intermittent)
d. Non -process wastewater flow rate. Indicate the average daily volume of non -process wastewater flow discharged into the collection system
in gallons per day (gptl) and whether the discharge is continuous or intermittent.
8,000 gptl (nc continuous or internittent)
F.7. Pretreatment Standards. Indicate whether the SIU is subject to the following:
a. Local limits X Yes ❑ No
b. Categorical pretreatment standards X Yes ❑ No
If subject to categorical pretreatment standards, which category and subcategory?
40 CFR Part 433 — Metal Finishing
F.8. Problems at the Treatment Works Attributed to Waste Discharge by the SIU. Has the SIU caused or contributed to any problems (e.g.,
upsets, interference) at the treatment works in the past three years?
❑ Yes XX No If yes, describe each episode.
FACILITY NAME AND PERMIT NUMBER:
PERMIT ACTION REQUESTED:
RIVER BASIN:
Mallard Creek WWTR NCO030210
Renewal
Yadkin-PeeDee
RCRA HAZARDOUS WASTE RECEIVED BY TRUCK, RAIL, OR DEDICATED PIPELINE:
EPA Form 3510-2A (Rev. 1-99). Replaces EPA forms 7550-6 & 7550-22. Page 19 of 22

F.S. RCRA Waste. Does the treatment works receive or has it in the past three years received RCRA hazardous waste by truck, rail or dedicated pipe?
❑ Yes X No (go to F.12)
F.10. Waste transport. Method by which RCRA waste is received (check all that apply):
❑ Truck ❑ Rail ❑ Dedicated Pipe
F.11. Waste Description. Give EPA hazardous waste number and amount (volume or mass, specify units).
EPA Hazardous Waste Number Amount Units
CERCLA (SUPERFUND) WASTEWATER, RCRA REMEDIATION/CORRECTIVE ACTION
WASTEWATER, AND OTHER REMEDIAL ACTIVITY WASTEWATER:
F.12. Remediation Waste. Does the treatment works currently (or has it been notified that it will) receive waste from remedial activities?
❑ Yes (complete F.13 through F.15.) X No
F.13. Waste Origin. Describe the site and type of facility at which the CERCLA/RCRA/or other remedial waste originates (or is excepted to origniate in
the next five years).
F.14. Pollutants. List the hazardous constituents that are received (or are expected to be received). Include data on volume and concentration, if
known. (Attach additional sheets If necessary.)
F.15. Waste Treatment.
a. Is this waste treated (or will be treated) prior to entering the treatment works?
❑ Yes ❑ No
If yes, describe the treatment (provide information about the removal efficiency):
b. Is the discharge (or will the discharge be) continuous or intermittent?
❑ Continuous ❑ Intermittent If intermittent, describe discharge schedule.
END OF PART F.
REFER TO THE APPLICATION OVERVIEW (PAGE 1) TO DETERMINE WHICH OTHER PARTS
OF FORM 2A YOU MUST COMPLETE
EPA Form 3510-2A (Rev. 1-99). Replaces EPA forms 7550-5 & 7550-22. Page 20 of 22

Charlotte -Mecklenburg Utilities
Mallard Creek WRF
NPDES # N00030210
Process Flow Schematics
Attachment 3 - ADDITIONAL INFORMATION
OUTFALL NUMBER: 001
A.1 La ! Description of Treatment
Treatment consists of coarse and fine mechanical bar screens; grit
removal; day tanks; storm flow equalization; five primary clarifiers; three
trains in parallel of activated sludge treatment; three final clarifiers;
effluent traveling bridge filters; ultraviolet disinfection; reuse distribution;
sludge thickening; anaerobic digesters; and sludge dewatering.
B.3. Process Flow Diagram or Schematic
The attached flow schematic SC-1 (Attachment 2) shows the processes of the treatment
facility along with bypasses. The plant is currently designed to treat 12.0 million gallons
per day (mgd) of wastewater.
12 mgd treatment description
g I
Preliminary treatment:
Wastewater enters the plant through a 36-inch gravity sewer line to enter the headworks
and influent pumping station. Flow entering the head works flows into a coarse manual
bar screen land through two new mechanical screens where the screenings are compacted
and conveyed to a dumpster loading area. Flow from the screens is sent to 2 vortex grit
removal basins of 30.0 mgd capacity.
Primary treatment:
Following '!preliminary treatment, the wastewater splits between two cells of the flow
equalization day tanks. From here, it is pumped to the distribution boxes (DB), DB-1,
DB-1 A and DB-2A and is distributed to the five existing primary clarifiers (PC-1 through
PC-5). After primary treatment in the clarifiers, a part of the wastewater from PC-3 and
PC-4 is directed to DB-2. It continues through to DB-3 to combine with wastewater from
PC-1 and PC-2 to flow in to DB-10 and further to DB-5 where it is combined with Return
Activated Sludge (RAS). Flow from PC-5 flows to DB-17 where it combines with RAS.

Secondary treatment:
The combined flow of 8.0 mgd design and 12.0 mgd peak flow from DB-10 is split
equally between DB-5 and DB-15 where it is combined with RAS and split between
biologicaltreatment trains 1 and 2. It goes through anoxic zone and aeration zone with
internal recycle. The activated sludge process is carried out in a series of rectangular
aerations basin followed by round aeration basin.
Flow from DB-17 combines with RAS and flows into Treatment train 3, through anoxic
basins andl rectangular aeration basins.
Following the aeration basin, flow from round oxic basins of trains 1 and 2 is combined
in DB-9 and split to final clarifiers (FC) FC-1 and FC-2. Flow from train 3 aeration basin
is sent to C-3.
Tertiary treatment:
Combined! secondary effluent from all the final clarifiers is sent to filter distribution
*structure (FDS) FDS-1 and FDS-2 for filtration. Filtered effluent is sent for UV
disinfectio% and re -aeration structure where aeration takes place. The effluent is
discharged through a 42" line into Mallard creek.

yin
CHARLOTTEsm
March 12, 2007
Toya Fields
Division of Water Quality
NPDES Unit
1617 Mail Service Center
Raleigh, North Carolina 27699 - 1617
RE: Mallard Creek WRF, NPDES Permit #NC0030210
Dear Ms. Fields,
Il'� fI 1 J I00
DENR - WATER OU.2LITY
POINT SHRCE EA,.:;CH
On Tuesday March 6, 2007 Charlotte Mecklenburg Utilities Lab Services Division went out to collect
the Creek Samples above and Below the Mallard Creek WRF. There are two sites downstream of
the plant that should be sampled. The first site is at NCSR 1300. The lab was unable to access this
site due to the road being closed. A sign at the road closure location indicated that the road would be
closed until the end of April, 2007 and potentially into May. Lab Services looked at finding another
site that could be used in lieu of this site, but was not able to find one. At this time, we will be unable
to collect the Downstream One sample until the road repair has been completed. We will continue to
collect the second downstream sample.
The Lab Services Division will check this site periodically to see if the road has opened. Please let
me know if you need any other information about this issue. Thank you for your assistance.
Sincerely,
Dawn K. Padgett
Water Quality Program Administrator
Environmental Management Division
Charlotte Mecklenburg Utilities
Environmental Management Division 4000 Westmont Dr.. Charlotte, NC 28217
Phone: [phone] Charlotte -Mecklenburg Utilities