NC0036277_Permit Issuance_20090713

NPDES DOCUWENT SCANNINS COVER :iMEET
NPDES Permit:
NC0036277
McDowell Creek WWTP
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
July 13, 2009
This document i6 printed on reuse paper -ignore any
content on the reverse Bide

r
NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins
Governor Director
July 13; 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 NCO036277
McDowell Creek WWTP
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 the following modification compared to the draft permit sent to you on
May 20, 2009.
• The reuse clause under the Supplement to Permit Cover Sheet and in Section A. (4.) was removed.
Based on discussions with the Aquifer Protection Section and the use and volume of reclaimed
water needed at the McDowell facility the Division recommends that Charlotte Mecklenburg
Utilities pursue a non -discharge permit.
• A statement recognizing McDowell WWTP's Class IV facility rating was added on the
Supplement to Permit Cover Sheet.
Please note that the receiving stream is listed as an impaired waterbody on the North Carolina 303(d)
Impaired Waters List. Addressing .impaired waters is a high priority with the Division, and iristream
data will continue to be evaluated. If there is noncompliance with permitted effluent limits and stream
impairment can be attributed to your facility, then mitigative measures may be required.
1617 Mail Service Center, Raleigh, North Carolina 27699-1617 NonrthCarolina
Location: 512 N. Salisbury St. Raleigh, North Carolina 27604 y Phone: [phone] FAX: [phone] Customer Service:1-877.623-6748
Internet www.ncwaterqual4.org
An Equal Opportunity % Affirmative Action Employer

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 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 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.
If you have questions concerning this permit, please contact Julie Grzyb by e-mail
[e-mail]) or phone at [phone].
jc
relly�, YV ln H. Sullins
r /
Enclosures: NPDES Permit NCO036277
cc: EPA/Region
Mooresville Regional Office / Surface Water Protection Section (ecopy)
PERCS (ecopy)
Ecosystems Unit/Attn. Jenny Atkins (ecopy)
Aquatic Toxicology Unit (ecopy)
Steve Reid, TACU (ecopy)
NPDES File
Central Files
Mecklenburg County DEH, Groundwater & Wastewater Services,
700 N. Tryon St., Suite 211, Charlotte, NC 28202
1617 Mail Service Center, Raleigh, North Carolina 27699-1617 One
Location: 512 N. Salisbury St. Raleigh, North Carolina 27604 NorthCarohna
Phone: [phone]FAX: [phone]Customer Service: 1-877-623-6748 �Q'tu `!J/
Internet wvv:.nmaterquality.org y
An Equal Opportunity 1 AFmnain Action Employer

t
• Permit No. NCO036277
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
In compliance with the provision of North Carolina General Statute 143-215.1, other lawful
standards and,regulations promulgated and adopted by the North Carolina Environmental
Management Commission, and the Federal Water Pollution Control Act, as amended,
City of Charlotte
(Charlotte -Mecklenburg Utilities)
is hereby authorized to discharge wastewater from a facility located at the
McDowell Creek Wastewater Treatment Plant
NCSR 2074
Huntersville
Mecklenburg County
to receiving waters designated as McDowell Creek in 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 shall become effective August 1, 2009.
This permit and authorization to discharge shall expire at midnight on December 31, 2013.
Signed this day July 13, 2009.
en H. Sullins, Director
Division of Water Quality
By Authority of the Environmental Management Commission

c
Permit No. NC0036277
SUPPLEMENT TO PERMIT COVER SHEET
The exclusive authority to operate this facility arises under this NPDES permit. The conditions,
requirements, terms and provisions of this NPDES permit governs surface water discharges from
this facility. All previous NPDES Permits issued to this facility bearing this permit number,
whether for operation or discharge, are hereby revoked.
City of Charlotte (Charlotte -Mecklenburg Utilities)
is hereby authorized to:
1. Continue to operate the existing 12.0 MGD wastewater treatment facility consisting of:
• Two 6 million gallon storm flow equalization tanks
• Mechanical bar screens
• grit removal
• odor control
• one 1.3 million gallon flow equalization day tank
• five primary clarifiers
• two trains in parallel of activated sludge treatment utilizing three stage Biological
Nutrient Removal (BNR) and two trains in parallel of activated sludge treatment
utilizing five stage Biological Nutrient Removal
• four final clarifiers
• effluent denitrifying filters
• anaerobic sludge digestion
• Mechanical sludge thickening and dewatering equipment
• sand drying beds
• UV disinfection
• Membrane filtration and reuse distribution
This facility is located at McDowell Creek Wastewater Treatment Plant,
on SR 2074, 4901 Neck Road, near the Town of Huntersville in Mecklenburg County.
McDowell WWTP is currently rated a Class IV facility.
2. After receiving a Non -Discharge permit for reclaimed water use, operate facilities to
distribute up to 3 MGD of reclaimed wastewater in accordance with the applicable Non -
Discharge permit.
3. Discharge from said treatment works at the location specified on the attached map into
McDowell Creek, which is classified WS-IV water in the Catawba River Basin.

NC00036277 - CMU McDowell Creek
Facility
Latitude:
3e22'54" Sub -Basin: 03-08-33
Location
Longitude,
W56'20" County: Mecklenburg
a #:
F15NWILake Norman South
Stream Class:
Receiving Stream:
WS-Iv
McDowell Creek
^ ,O/_
Charlotte Mecklenburg Utilities
NC0036277
I\VI 1/I7
CMU - McDowell Creek W WTP

Permit No. NCO036277
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
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:
EFFLUENT <� , _ '
CHARACTERISTICS, `
t :
= EFFLUENT LIMITS;
MONITORING REQUIREMENTS ;
Monthly
Average
Weekly
Avers e:`
Daily
Maximum
Measurement
Fre uen
Sample Type
Sample Location
Flow
12.0 MGD
Continuous
Recording
I or E
CBODS 200C 2 Summer
4.2 m /L
6.3 m /L
Daily
Composite
E, I
CBODs 20°C 2 inter
8.3 m L
12.4 m /L
Daily
Composite
E, I
Total Suspended So1ids2
9.0 m /L
13.5 m L
Daily
Composite
E, I
NH3 as N
1.0 m /L
3.0 m fl
Daily
Composite
E
Dissolved OxygeO
Daily
Grab
E
Fecal Coliform eometric mean
100 / 100 ml
200 / 100 ml
Daily
Grab
E
Total Residual Chlorine4
19 /L
Daily
Grab
E
Temperature °C
Daily
Grab
E
Total Nitrogen Summer
450 lbs/day
Monthly
Composite
E
Total Nitrogen PMinter
500 lbs/day
Monthly
Composite
E
Total Phosphorus Summer
27 lbs/day
Monthly
Composite
E
Total Phosphorus inter
32 lbs/day
Monthly
Composite
E
Chronic Toxicity5
Quarterly
Composite
E
Conductivity
Daily
Grab
E
Total Copper
2/Month
Composite
E
Total Zinc
2/Month
Composite
E
Total Mercury
2/Month
Grab
E
H
Between 6.0 to 9.0 standard
units
'Daily
Grab
E
Dissolved Oxygen
Weekly
Grab
U, D
Temperature °C
Weekly
Grab
U, D
Conductivity
Weekly
Grab
U, D
Chloro h ll-a Summer
Monthly
Grab
D
Total Phosphorus Summer
Monthly
Grab
D
NH3-N Summer
Monthly
Grab
D
TKN Summer
Monthly
Grab
D
NO2 + NO3 as N Summer
Monthly
Grab
D
Footnotes:
i Sample Locations: E — Effluent, I — Influent, U — Upstream at Beatties Ford Road,
D- Downstream at Neck Rd.
2 The monthly average effluent CBODs and total suspended solids concentrations shall not exceed 15% of
the respective influent value (85% removal).
3 The daily average dissolved oxygen effluent concentrations shall not be less than 5.0 mg/L.
4 Monitoring only if effluent is chlorinated.
8 Chronic Toxicity (Ceriodaphnia) P/ F at 90 % effluent concentration shall be conducted quarterly
(January, April, July and October). Refer to Part A. (2).
[Summer] = April 1- October 31
[Winter] = November 1- March 31
Total Nitrogen = NO2 + NO3 + TKN
Lbs/day= Pounds/Day
There shall be no discharge of floating solids or visible foam in other than trace amounts.

Permit No. NC0036277
A. (2.) CHRONIC TOXICITY PERMIT LIMIT WRTRIM
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, auarterlu 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 January, April, JuIJ. and October. 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 rust 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 THP311, 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 more 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 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.

Permit No. NCO036277
A. (3) EFFLUENT POLLUTANT SCAN
-The Permittee shall perform an annual Effluent Pollutant Scan for all parameters listed imthe attached table. The
analytical methods shall be in accordance with 40 CFR Part 136 and shall be sufficiently sensitive to determine
whether parameters are present in concentrations greater than applicable standards and criteria. Samples shall
represent seasonal variations. Unless otherwise indicated, metals shall be analyzed as total recoverable."
Ammonia (as N)
Trans-1,24chloroethylene
Bis (2-chloroethyl) ether
Chlorine (total residual, TRC)
1,1-dichloroethylene
Bis (2-chloroisopropyl) ether
Dissolved oxygen
1,2-dichloropropane
Bis (2-ethylhe)yl) phthalate
Nitrate/Nitrite
1,34chloropropylene
4-bromophenyl phenyl ether
Kjeldahl nitrogen
Ethylbenzene
Butyl benzyl phthalate
Oil and grease
Methyl bromide
2-chloronaphthalene
Phosphorus
Methyl chloride
4-chlomphenyl phenyl ether
Total dissolved solids
Methylene chloride
Chrysene
Hardness
1,1,2,2-tetrachloroethane
Dk-butyl phthalate
Antimony
Tetrachloroethylene
Dan-oc to phthalate
Arsenic
Toluene
Dibenzo(a,h)anthracens
Beryllium
1,1,1-trichloroethane
1,2-dichlorobenzene
Cadmium
1,1,2-tdchloroethane
1,3-dichbrobenzene
Chromium
Tdchloroethylene
IA-dichbrobenzene
Copper
Vinyl chloride
3,3-dichlorobenzidine
Lead
Acid -extractable compounds.
Diethyl phthalate
Mercury
P-chloro-m-cresol
DimethI phthalate
Nickel
2-chlorophenol
2,44nitrotoluene
Selenium
2,4-dichlorophenol
2,6-dinitrotoluene
Silver
2,4-dimethylphenol
1,2-diphenylhydrazine
Thallium
4,6-dlnitro cresol
Fluoranthene
Zinc
2,4-dinitrophenol
Fluorene
Cyanide
2-nitrophenol
Hexachlorobenzene
Total phenolic compounds
4-nitrophenol
Hexachlorobutadiene
Volatile organic compounds:
Pentachlorophenol
Hexachlorocyclo-pentadlene
Acrolein
Phenol
Hexachloroethane
Acrylonitrile
2,4,6-tdchlorophenol
Indeno(1,2,3-cd)pyrene
Benzene
Base -neutral compounds:
Isophorone
Bromoform
Acenaphthene
Naphthalene
Carbon tetrachloride
Acenaphthylene
N'ftrobenzene
Chlorobenzene
Anthracene
N-nitrosodi-n-propylamine
Chlorodibromomethane
Benzidine
N-nitrowdimethylamine
Chloroethane
Benzo(a)anthracene
N-nitrosodiphenylamine
2-c hloroethylvinyl ether
Benzo(a)pyrene
Phenanthrene
Chloroform
3,4 benzofluoranthene
Pyrene
Dichlorobromomethane
Benzo(ghi)perylene
12,4-trichlorobenzene
1,1-dichloroethane
Benzo(k)fluorenthene
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:
NC DENR / DWQ / Central Files
1617 Mail Service Center
Raleigh, NC 27699-1617.

CMU - McDowell Creek
NPDES No. NCO036277
NC DENR/DWQ
FACT SHEET FOR NPDES PERMIT DEVELOPMENT
CMU - McDowell Creek W WTP
NPDES No. NCO036277 (Draft)
Facility Information
Applicant/Facility Name:
Charlotte -Mecklenburg Utilities - McDowell Creek WWTP
Applicant Address:
5100 Brookshire Blvd.; Charlotte, NC 28216
Facility Address:
NCSR 2074, near the Town of Huntersville
Permitted Flow
12.0 MGD
Type of Waste:
85%Domestic
15010 Industrial
Pretreatment Program:
No SIU's, maintains Long Term Monitoring Program
as part of CMU
Facility/Permit Status:
Class IV/Active; Major Renewal
County:
Mecklenburg Count
Miscellaneous
Receiving Stream:
McDowell Creek
Regional Office:
Mooresville
Stream Classification:
WS-IV
State Grid / USGS Quad:
F15NW/Lake
Norman
303(d) Listed?
Yes
Permit Writer:
Julie Grz b
Subbasin:
03-08-33
Date:
May 15, 2009
Drainage Area (mi):
28.3
.'AdW
Lat. 350 22 54" N Long. 800 56' 20" W
Summer 7Q10 (cfs)
1.8
Winter 7Q10 (cfs):
4.2
30Q2 (cfs)
Average Flow (cfs):
31
IWC (%):
91 %
SUMMARY
This plant was constructed in 1980 as a 3.0 MGD activated sludge facility serving the
Charlotte metropolitan area. A facility expansion to 6.0 MGD in 1999 incorporated a 3-
stage biological nutrient removal (BNR) process. During the previous permit cycle the
permittee requested a major permit modification to provide for interim phased flow limits at
6.6 MGD (based on a facility re -rating of current treatment system), with phased
construction to 9.0 MGD and 12.0 MGD. The facility completed its expansion in one
construction project and began meeting the requirements for the 12 MGD permit on
December 1, 2007. The expanded facility has four trains of activated sludge treatment
utilizing three and five stage biological nutrient removal.
Treated effluent from the plant is discharged into McDowell Creek approximately 0.5 miles
upstream of Mountain Island Lake on the Catawba River. McDowell Creek is classified as a
WS-IV stream (no longer CA) and on the NC 2006 303(d) list as impaired based on biological
data for the last 11.6 miles prior to discharge into Mountain Island Lake.
The source of impairment is identified as land development which results in an increased
discharge of pollutants carried in stormwater runoff from rapidly increasing impervious:.
cover (parking lots, roads, houses, etc.) and construction activities in the McDowell Creek
watershed.
The lake serves as a drinking water supply for Charlotte and the 12 MGD permit limits were
developed using extensive water quality modeling to evaluate future conditions in McDowell
Creek and Mountain Island Lake, where nutrient enrichment is of primary concern. Using
Page 1 of 4
Version: 5/15/-009

CMU - McDowell Creek
NPDES No. NCO036277
the Bathtub model of Mountain Island Lake and McDowell Creek Cove developed by CMU's
consultant, the Division ran several model scenarios to develop phased expansion limits for
TN and TP. The modeling endpoint was to have less than 10% of the model predictions
exceed the chlorophyll -a water quality standard of 40 ug/1.
CMU has a full pretreatment program through the Division of Water Quality's PERCS Unit for all
five municipalities it operates including the McDowell Creek facility. There are no categorical
industries or significant industrial users in the McDowell Creek service area. CMU McDowell Creek
voluntarily administers its Long Term Monitoring Program under PERC's analyzing 12 different
metals and Oil & Grease on a monthly basis in addition to its NPDES permit monitoring.
Class B solids are land applied in accordance with land application permit number WQ0000057 in
North Carolina and SCDHES Permit #ND0080900 in South Carolina. Biosolids that do not meet the
Class B requirements are disposed at local landfills. Currently this facility does not have a Non -
Discharge permit to reuse wastewater; however, discussions with potential customers are being held.
The facility does have membrane filtration and reuse distribution equipment to reclaim wastewater if
desired.
DMR DATA
Effluent Chemistry: In reviewing effluent data from 2007 and 2008; CBOD and TSS concentrations
average less than 2 mg/1 and 1 mg/L respectively, with annual removal rates exceeding 99%; TN effluent
averaged 212 lbs/day with an removal rate > 88%; TP effluent has averaged less than 0.23 nig/l with a
removal rate > 96%.
Effluent Pollutant Scalars
The application contained data from five annual Effluent Pollutant Scans on volatile organic compounds
and six scans "on Acid-Extractables and Base -Neutral compounds. The scans did not find these
contaminants 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.
Toxicity Testing
Effluent Toxicity: The facility has passed all 18 toxicity tests for Ceriodaphnia and 4 tests for fat head
minnow taken during the last four and one-half years. Effluent toxicity has not been a water quality
issue. DWQ recommends that the quarterly chronic toxicity tests at 90% be continued in the renewed
permit.
Reasonable Potential Analysis (RPA) Results
Effluent data for toxicants were reviewed for the period January 2007 through December 2008. All
effluent data for arsenic, cadmium, chromium, lead, molybdenum, selenium, and cyanide requiring
analyses under the pretreatment program were reported in less than detectable amounts. Cadmium had one
measurement at 2.0 ug/L. As part of its Pretreatment Long Term Monitoring Plan, CMU will continue to
monitor these parameters but no effluent limits or monitoring will be required in the NPDES permit.
A review of the past three years (2006, 2007, 2008) of effluent sampling data for silver showed all results
were less than detectable levels of 5 ug/L and several at less than a detectable level of 1 ug/L. Silver
monitoring was originally put in the permitee's NPDES permit issued -in 2001 based upon a finding of
reasonable potential for the effluent to violate the allowable Water Supply in -stream concentration of 10
ug.L. The 2001 RPA was based on sampling that primarily measured silver at a detection level of <30
Page 2 of 4
V asion: 5/1 5r-009

CMU - McDowell, Creek
NPDES No. NCO036277
ug/L. Since samples measured at the facility during the past five years were below detectable levels of 5
and 1 ug/L, it is recommended that silver monitoring be removed from the permit renewal. Silver will
continue to be monitored on a monthly basis as part of CMU's Pretreatment Long Term Monitoring Plan.
The following metals were found in detectable levels in the facilities effluent so a reasonable potential
analysis was conducted for copper, zinc, nickel, and mercury (attached). The results of these analyses are
summarized in the table. below.
s
S�,Fi'..».s�•.' `�..fa9�N�r.., s..:.w..:iHtu�..t...
...i;,-.�!". •..Ysa �.;
Copper (ug/L) AL
7
8
10
Zinc (ug/L) AL
67
55 .
114
Nickel (ug/L)
261
97
5.2
Mercury (n ).
N/A
13
5.8
• Nickel continues to be a parameter showing no reasonable potential for an in -stream
violation so it will not be monitored in the permit but remain as part of the Pretreatment
LTMP.
• Mercury does not show a reasonable potential for an in -stream violation. No limitation is
necessary; however, monitoring should be maintained due to the effluent concentration levels of
the contaminant and the high IWC. It is recommended that the permit be renewed without the
mercury limitation and the monitoring changed from weekly to 2/Month.
• The copper and zinc maximum predicted concentrations exceed the allowable acute and chronic
standards exhibiting some reasonable potential for a violation. For these parameters, the
standards are Action Level standards and should be reviewed in conjunction with toxicity testing.
It is recommended that monitoring be continued for both parameters as part of its NPDES permit
at a frequency of 2/Month. Should the presence of copper and zinc in the effluent be identified as
causative factors of whole effluent toxicity, limitations will be determined.
Water Quality Based Effluent Limits
McDowell Creek, the receiving stream segment is subject to water quality standards applicable to the
classification Water Supply, class IV, for freshwater streams. The previous permit included water -
quality based effluent limits for TRC, TN, TP, and Mercury. Ammonia nitrogen and BOD were
based on both water quality modeling and best available technology. TN and TP were determined
based on the 2003 modeling endpoint which was to have less than 10% of the model
predictions exceed the chlorophyll -a water quality standard of 40 ug/L. Current limitations
for BOD/CBOD, NH3-N, TN, and TP will remain in the permit. The facility no longer uses
chlorine for disinfection, however; the TRC limit will remain in the permit should the
effluent be chlorinated for any reason.
ADDITIONAL DATA
The inspection reports reveal a well maintained and properly operated facility. Records
show the facility had only one violation in 2008. resulting from a Priority'Pollutant Scan. which
analyzed TRC at 90 ug/L. The. permit limitation is 19 uglL. CMU personnel are unable to
conclude how the TRC was in the discharge since UV is used for disinfection. CMU personnel
have re-evaluated all possibilities and no possible cause was ever found.
Page 3 of 4
Vcrsion: 5/15/2009

i
CMU — McDowell Creek
NPDES No. NCO036277
PROPOSED PERMIT CHANGES
Remove monitoring for total silver from the permit.
Remove the mercury limitation and reduce monitoring to 2/Month.
PROPOSED SCHEDULE FOR PERMIT ISSUANCE
Draft Permit to Public Notice: 05/20/09
Permit Scheduled to Issue: 07/13/09 (estimate)
NPDES DIVISION CONTACT
If you have questions regarding any of the above information or on the attached permit, please contact
Julie Grzyb at [phone] or by email [e-mail].
NAME: DATE:
REGIONAL OFFICE COMMENTS
NAME: DATE:
SUPERVISOR: DATE:
Page 4 of 4
Vcrsion: 5115P-009

REASONABLE POTENTIAL ANALYSIS
4
1
4
5
9
11
1t
CMU - McDowell Creek WWTP
NCO036277
Time Period January 2007 - December 2008
Ow (MGD) 12
. WWTP Class IV
7Q10S (cfs) 1.8
1WC (%) 0 7010S 91.176
701OW (cfs) 4.2
® 701OW 81.579
3002 (cfs) 0
30Q2 N/A
Avg. Stream Flow, QA (cfs) 31
® QA 37.5
Reeving Stream McDowell Creek
Stream Class WS-IV
Ouffall 001
Qw^12MGD
STANDARDS &
PARAMETER
TYPE
CRITERIA (2)
POL
Units
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
(1)
NC Wos/ fi FAV/
a F pa Max Pred CW Aftwabte CW
Chron/c Acute
Acute: WA
WaterSapply;standard - ug/L
Arsenic
C
10
ug/L
77 0
2.9
No reasonable potentialfor a_n;tn-stream viOtatiot
_ _ - _ _ _ _
Chronic: 27
Ad stunples less lh8n deieclatite
Remains in CMU's Long Term:Pretreatinent Moriitofgig Ptan
Acute: 1,022
Chromium
NC
50 1,022
ug/L
77 1
2.9
No re_asonaW potential for an Wstrearri violation
_ _ _ _ _ _ _ _
Chronic 55
_
Remains to CMU s Long Term Pretreafinent Monitoring Plan
Acute: 7
Copper
NC
7 AL 7.3
uglL
77 37
10.1
_ _
-8
Reasonable potential to exceed stds
_ _
Chronic:
No timtt as this Is an'actbri Level parameter
Mairifam monitoring:: S:
Acute: WA
Mercury
NC
12
2.0000
ng/L
73 26
5.7810
Noo reasonable potential for a_n irrstre_am violation _
_ - _ _ _ _
Chronic: 13
1lemove permit Fimitatton'and reduce monito ft to 2MMorith
Acute: 261
WaterSupply standard - 25_ugfL
Nickel
NC
25 261
ug/L
77 61
5.2
Noreasonablekor:tialfor'a_nWStream _vlolation
_ _ _-_
Chronic: 27
Remains In GMU's Long Terrrr Pretreatment Mgrib jng Plan
Acute: 67
Zinc
NC
50 AL 67
ug/L
77 77
114.0
Reasonable potential to exceed stds
_ _ _ _ _ _
Chronic: 55
No [imd�as this is an action level aarameter
Maintain rt�orrtioring..
•Legend:
C = Carcinogenic
NC = Non-cardnogenic
A = Aesthetic
•' Freshwater Discharge
McDowell rpa 2009 extra.xis, rpa
5/15/2009

1 REASONABLIt POTENTIAL ANALYSIS
Arsenic
Chromium
Date Data
BDL=I2DL
Results
Dale Data
BDL=I2DL
Results
1
1/2/2007 <
5
2.5
Std Dev.
0.6795
1
1/2/2007 <
5
2.5
Std Dev.
0.4489
2
1/32007
Mean
2.4026
2
1/3/2007
Mean
2.3896
3
1/412007 <
5
2.5
C.V.
0.2412
3
1/42007 <:
5
2.5
C.V.
0.1878
4
1/8/2007
n
77
4
1/8/2007
n
77
5
1/10/2007
5
1/10/2007
6
1/16/2007 <
5
2.5
Mult Factor =
1.2000
6
1/16/2007 <1
5
2.5
Mult Factor =
1.1500
7
1/17/2007 <
5
2.5
Max. Value
5.0 ug/L
7
1/17/2007 <°.
5
2.5
Max. Value
2.5 ug/L
8
1/182007
Max. Pred Cw
6.0 ug4
8
1/18/2007 1
Max. Pred Cw
2.9 ug4
9
1/2212007 <.
5
2.5
9
1/22t2007 <4
5
25
10
12412007
10
1/24/2007
11
1/2912007 <
5
2.5
11
1/29/2007 <
5
25
12
1/31/2007
12
1/31/2007
13
2/2/2007 <
5
2.5
13
2/2/2007 <
5
2.5
14
2/6/2007
14
2/6/2007
15
2/82007 <
5
2.5
15
2/8/2007 <.
5
2.5
16
2/12/2007
16
211212007 -'
17
2114/2007 <
5
2.5
17
2/14/2007 <
5
2.5
18
2/19/2007
18
2119/2007
19
2/20/2007 <
5
2.5
19
2/20/2007 <
5
2.5
20
221/2007
20
221/2007
21
2/26/2007 <
5
2.5
21
2/26/2007 <1
5
2.5
22
228/2007
22
2/28/2007
23
3/2/2007 <
5
2.5
23
3/2/2007 <--
5
2.5
24
315/2007.
24
315/2007-
25
302007 <
5
25
25
3/9/2007 <
5
2.5
26
3/12/2007
26
3/12/2007
27
3/13/2007
27
3/13/2007
28
3/14/2007
28
3/14/2007
29
3/20/2007 <
5
2.5
29
3/20/2007 <
5
2.5
30
3/21/2007
30
3/21/2007
31
3/22/2007 <
5
2.5
31
3/22/2007 <1
5
25
32
3/2612007 <
5
2.5
32
3/26/2007 <
5
2.5
33
3/27/2007
33
3/27/2007
34
4122007
34
4/2/2007
35
4I412007 <
5
2.5
35
4/4/2007 <
5
2.5
36
4/812007
36
4/9/2007
37
4/10/2007
37
4110M07
38
4/11/2007 <
5
2.5
38
4/11/2007 <
5
2.5
39
4/132007
39
4/13/2007
40
4/14/2007 <
5
2.5
40
4/14/2007 <
5
2.5
j 41
4/16/2007
41
4/16/2007
42
4/172007 <
5
2.5
42
4/17/2007 <
5
2.5
43
4/232007
43
423/2007 _
44
4/25/2007
44
4125/2007
45
4/30/2007 <
5
2.5
45
4130/2007 <
5
2.5
46
5/1/2007 <
5
25
46
5/1/2007 <
5
2.5
47
5/3/2007
_
47
5WO07
48
5/6/2007 <
5
2.5
48
5/6/2007 <9
5
2.5
49
5r712007
49
6/7/2007
50
5/14/2007
60
5114/2007
51
5/16/2007 <
5
2.5
51
5/16/2007 <
5
2.5
52
5/21/2007
52
5/21/2007
53
512PJ2007
53
5/222007
54
5/23/2007 <
5
2.5
54
5/2312007 <
5
2.5
55
5/29/2007 <
5
2.5
55
5/29/2007 <'.
5
2.5
56
5/30/2007
56
5/30/2007
57
6/4/2007 <
5
2.5
57
6/4/2007 <
5
2.5
58
6/11/2007
58
6/11/2007
59
6/1212007
59
6/12/2007
60
6/1312007
60
6/13/2007
61
6/15/2007
61
6/15/2007
62
6118/2007 <
5
2.5
62
6118/2007 <1
5
25
63
620/2007
63
6/20/2007 ^;
64
62112007
64
621/2007
65
6/25/2007 <
5
2.5
65
6/26/2007 <`'
5
2.5
66
6/2712007 <
5
2.5
66
6/27/2007 <
5
2.5
67
628/2007 <
5
2.5
67
6/28/2007 c:
5
2.5
68
7/2/2007
68
7/2/2007
69
7/9/2007
69
7/9/2007
70
7/11/2007 <
5
2.5
70
7/11/2007 <'
5
2.5
71
7/16/2007
71
7116/2007
72
7/17/2007
72
7/17/2007
73
7/18/2007 <
5
2.5
73
7/18/2007 <'
5
2.5
74
7/23/2007 <
1
0.5
74
7/23t2007 <,
1
0.5
75
7/26/2007
75
7/25/2007
76
7/30/2007 <
5
2.5
76
7/30/2007 <.:
5
2.5
77
8/1/2007
77
8/1/2007 ',
78
8/2/2007 <
1
0.5
78
8/2/2007 <,;
1
0.5
79
8/6/2007
79
802007 .
80
8/8/2007 <
1
0.5
80
8/8/2007 1
2
2.0
81
8/132007
81
8/13/2007
82
8/14/2007
82
8/14/2007
McDowell rpa 2009 extra,
83
8/15/2007 <
1
0.6
83 -1
B/15/2007 <.
1
0.5
4,
s. data

84 8/2012007 as slzv2oo7 e
REASONABLE. �TejgT 7' . ANALYSIS
86
8/27/2007 <
1
0.5
87
8/29/2007
88
e/3012007 <
5
2.5
89
9/4/2007
90
9/512007 <
5
2.5
91
0/10/2007
92
9/13/2007 <
5
2.5
93
9/14/2007
94
9/17/2007
95
9/20/2007 !
5
5.0
96
9/24/2007
97
9/26/2007 <
5
2.5
98
10/l/2007 <
5
25
99
10/5/2007 <
5
Z5
100
10/8/2007
101
10/10/2007 <
5
2.5
102
10/15/2007
103
10/16/2007
104
10/1712007 <
5
2.5
105
10/22/2007
106
10/29/2007 <
5
2.5
107
10/31/2007<
5
25
108
ll/l/2007
109
111512007.
110
1116/2007 <
5
2.5
111
11/9/2007
112
11/10/2007 <
5
2.5
113
11/12/2007
114
11/13/2007
115
11/14/2007 <
5
2.5
116
11119/2007'<
5
2.5
117
11/2112007
118
11/2812007 <
5
2.5
119
ll/27/2007
120
12/2/2007 <
5
2.5
121
12/3/2007 <
5
2.5
122
12/5/2007
123
12110/2007
124
12/12/2007 <
5
2.5
125
12/17/2007
126
12/18/2007 <
5
2.5
127
12/19/2007
128
12126/2007 <
5
2.5
129
12/31/2007 <
5
2.5
130
1/212008 <
5
2.5
131
117/2008.
132
1/14/2008<
5
2.5
133
1/16/2008
134
1/22/2008
135
1/23/2008 <,
5
2.5
136
1/28/2008
137
1/30/2008<
5
2.5
138
2/4/2008
139
215/2008, <
5
2.5
140
2/6/2008
141
2/11/2008
142
2114/2008 <
5
25
143
211812008' <
5
2.5
1"
2/20/2008 <
5
2.5
145
2/27/2008 <
5
2.5
146
3/5/2008
147
3110/2008 <
5
2.5
148
3/12/2008,
149
3/18/2008 <
5
2.5
150
3/1912008 <
5
2.5
151
312612008. <
5
2.5
152 April <
5
2.5
153
<
5
2.5
154
<
5
9 5
polate to find Mult. Factor
n = 77 1 Hits)
cv = 0.241
which truncates to 0.2
row in M.F. Table - 77
column in M.F. Table- 2
upper & lower Mult. Factors and interpolate:
value 1 address ='mf table'!$C$79
value 1 = 1.1610489
value 2 address = 'mf table'!$D$79
value 2 = 1.24775324
Interpolated MF value = 1.19675703
Round to 2 dec. places to get MF:
1.20
86
8/27/2007 <
1
0.5
87
8/29/2007
88
8/30/2007 <
5
2.5
89
9/4/2007
90
9/5/2007 <
5
2.5
91
9/10/2007
92
9/13/2007 <
5
2.5
93
9/14/2007
94
9117/2G07
95
9/20/2007 <
5
2.5
96
9/24/2007
97
9/26/2007 <
5
2.5
98
1011/2007 <
5
2.5
99
10/5/2007 <
5
2.5
100
10/8/2007
101
10/10/2007 <
5
2.5
102
10/15/2007
103
10/16/2007
104
10117/2007 <.
5
25
105
10/2212007
108
10/29/2007 <
5
25
107
1110112007 <
5
2.5
108
1111/2007
109
1115/2007
110
11/6/2007 <
5
2.5
111
11/9/2007
112
11/1012007 <
5
- 25
113
11/12/2007
114
11/13/2007
115
11/14/2007 <
5
2.5
116
11/19/2007 <
5
2.5
117
11/21/2007
118
11/26/2007 <
5
2.5
119
11/27/2007
120
12/2/2007 <
5
25
121
12/3/2007. <
5
2.5
122
121512007
123
12/10/2007
124
12112(2007 <
5
2.5
125
12/17/2007
126
12/18/2007 <
5
2.5
127
12/19/2007
128
12/26/2007 <
5
2.5
129
12/3112007 <
5
2.5
130
1/2/2008 <
5
2.5
131
1/712008
132
1/14/2008 <
5
2.5
133
1/16/2008
134
1/22/2008
135
1/23/2008 <
5
25
136
1/28/2008
137
1/30/2008 <
5
2.5
138
2/4/2008
139
2/5/2008 <
5
2.5
140
2/6/2008
141
2/11/2008
142
2/14/2008 <
5
2.5
143
2/18/2008 <
5
25
144
2/20/2008 <
5
2.5
145
2/27/2008 <
5
2.5
146
3/5/2008
147
3/10/2008 <
5
2.5
148
3/12/2008
149
3118/20DB <
5
2.5
150
3119120D8 <
5
2.5
151
3/26/2008 <
5
2.5
152 April <
5
2.5
153
<
5
2.5
154
<
5
2.5
nterpolate
to find Mult. Factor
n =
77
1 Hits)
cv = 0.188
which
truncates
to 0.1
=ind row in M.F. Table -
77
=ind column in M.F. Table -
1
'ick upper & lower Mult. Factors and interpolate:
value 1 address = 'mf
table'!$B$79
value 1 =
1.07811324
value 2 address ='mf table'!$C$79
value2=
1.1610489
Interpolated MF value
=
1.15096018
Round
to 2
dec. places to get MF:
1.15
rpa 2009 xtra.xls, data
4/22/2OD

5 REASONABLE POTENTIAL ANALYSIS
Copper
Mercury
Date Data
BDL=1/2DL
Results
Date Data
BDL=I2DL
Results
1
1/2/2007.
2.4
2.4
Std Dev.
1.1081
1
1/2/2007 <
1
1.0
Std Dev.
0.5146
2
1/3/2007
Mean
1.9221
2
1/3/2007
Mean
1.1041
3
1/4/2007 <
2
1.0
C.V.
0.5765
3
11/4/2007
C.V.
0.4661
4
118/2007
n
77
4
118/2007 <
1
1.0
n
73
5
1/10/2007
5
1/10/2007
6
1/16/2007 <
2
1.0
Mull Factor =
1.5000
6
1/16/2007
1.2
1.0
Mult Factor =
1.41
7
1/17/2007 <
2
1.0
Max. Value
6.7 ug1L
7
1/17/2007
Max. Value
4.1 ng/L
8
1118/2007
Max. Prad Cw
10.1 ug/L
8
1/18/2007
Max. Pred Cw
5.8 ng/L
9
1122/2007 <
2
1.0
9
1122/2007 <
1
1.0
10
112412007
10
1/24/2007
11
1/2912007 <
2
1.0
11
1/29/2007
1.2
1.0
12
1/31/2007
12
1/31/2007
13
202007 <
2
1.0
13
22/2007 '.
14
2/612007
14
2I8/2007 <,
1
1.0
15
2/8/2007 <
2
1.0
15
2/8I2007
16
2112/2007
16
2/12/2007
3
3.0
17
2/14/2007 <
2
1.0
17
2/14/2007
18
2/19/2007
18
2119/2007
19
2/20/2007 <
2
1.0
19
220/2007
4.1
4.1
20
2/21/2007
20
2/21/2007
21
2IM2007 <
2
1.0
21
2/26/2007
1.4
1.0
22
2/28/2007
22
2/28/2007
23
3/2/2007 <
2
1.0
23
3/2/2007
1.4
1.0
24
3/5/2007
24
3/5/2007
1.1
1.0
25
3/9/2007 <
2
1.0
25
3/9/2007
25
3/1212007
26
3/12/2007
27
3/13/2007
27
3/13/2007
1.1
1.0
28
3/14/2007
28
W1412007
29
3/20/2007
2.4
2.4
29
3/20/2007
1.1
1.0
30
321/2007
30
3/21/2007
31
3/22/2007
2.3
2.3
31
3/2212007
1.1
1.0
32
3/26/2007
2.2
22
32
3/26/2007
33
3/27/2007
33
3/27/2007
34
4/2/2007
34
4/2/2007 <
1
1.0
35
414/2007
2
20
35
4/4/2007
36
4/9/2007
36
4/9/2007 '
37
4/10/2007
37
4/10/2007
1.3
1.0
38
4/11/2007 <
2
1.0
38
4111/2007 <
1
1.0
39
4113/2007
39
4/13/2007
40
4/14/2007 <
2
'' 1.0
40
4/14/2007
1.7
1.0
41
4/16/2007
41
4/16/2007
42
4/17/2007
2.1
2.1
42
4/17/2007
43
4/23/2007
43
4/23/2007
1.9
1.0
44
4/25/2007 -
44
4/25/2007
45
4/30/2007 <.
2
1.0
45
4/30/2007 0'.
1
1.0
46
5/1/2007
2.9
2.9
46
5/l/2007
47
5/3/2007.
47
5/312007
48
SB2007
3.1
3.1
48
5/6/2007 <
1
1.0
49
5A/2007
49
5/7/2007
50
5/14/2007
50
5114/2007
1.3
1.0
51
5/16/2007
3.1
3A
51
6/16/2007
52
521/2007
52
5/21/2007
63
5/22/2007
53
522/2007 <;
1
1.0
64
523/2007
3.2
3.2
54
5/23/2007
55
5/29/2007
3.4
3.4
55
5/29/2007 <.
1
1A
56
5MI2007
56
5/30/2007 <
1
1.0
57
6/4/2007
3.7
3.7
57
614/2007
58
6/11/2007
58
6/11/2007
59
6/12/2007
59
6/12/2007 _
1
10
60
6/13/2007 -
60
6/13/2007
61
6/15/2007
61
6/15/2007
62
6118/2007 -
3.3
3.3
62
6/18/2007
1.1
1.0
63
6120/2007
63
6/20/2007
64
6/21/2007
64
6/21/2007
65
625/2007
3.6
3.6
65
6/25/2007 <
1
1.0
66
6/27/2007
2.6
2.6
66
6/27/2007
67
6/28/2007
2.4
2A
67
628/2007 _
1
1.0
68
71212G07
68
702007
69
7/9/2007 ..
69
7/9/2007 <,
1
1.0
70
7111/2007
2.6
Z6
70
7/11/2007
71
7/16/2007
71
7/16/2007
72
711712G07
72
7/1712007 <
1
1.0
73
7/18/2007
4.1
4.1
73
7118/2007 1
74
723/2007
3.2
3.2
74
723/2007
1
1.0
75
7/25/2007
75
7/25/2007 '
76
7/30/2007
3.4
3.4
'76
7/30/2007 <,
1
1.0
77
8/1/2007
77
8/1/2007
78
8/2t2007 -
2.8
2.8
78
802007 '
79
816/2007
79
8/6/2007 c'
1
1.0
80
8/8/2007
3
3.0
80
8/8/2007
81
e/l3/2007
81
8113r2007
82
8/14/2007
82
8/14/2007
1.3
1.0
McDowell rpa 2009 extra
83
8/15/2007
3.3
13
83 _
1 8/15/2007 _
q

84 8/20/2007
85 e/2212007
86 8/27/2007
87 8/29/2007
88 8/30/2007
89 9/4/2007
90 915/2007
91 9/10/2007
92 9/13/2007
93 9/14/2007
94 9/17/2007
95 9/20/2007
96 9124/2007
97 9/26/2007
98 10/1/2007
99 10/5/2007
100 10/8/2007
101 10110/2007
102 10/15/2007
103 10/16/2007
104 10/17/2007
105 10/2212007
106 10/29/2007
107 10/31/2007
108 11/l/2007
109 11/5/2007
110 11/6/2007
111 11/9/2007
112 11/10/2007
113 11/12/2007
114 11/13/2007
115 11/14/2007
116 11/19/2007
117 11/21/2007
118 11/26/2007
119 11/27/2007
120 12/2/2007
121 12/3/2007
122 12/5/2007
123 12/10/2007
124 12(12/2007
125 12/17/2007
125 12/18/2007
127 1211912D07
128 12/26/2007
129 12/31/2007
130 1/2/2008
131 1/7/2008
132 1/14/2008
133 1/16/2008
134 1/22/2008
135 1/23/2008
136 1/28/2008
137 1/30/2008
138 2/4/2008
139 2/5/2008
140 2/6/2008
141 2/11/2008
142 2/14/2008
143 2/18/2008
144 2(20/2008
145 2/27/2008
146 3/5/2008
147 3/10/2008
148 3/12/2008
149 3/18/2008
150 3/19/2008
151 3/26/2008
152 April
153
154
3.3
3.2
28
2.6
3.3
3.2
2.8
2.6
3.2 3.2
2 1.0
2.4 2.4
2 1.0
2.1 21
2 1.0
2 1.0
2 2.0
2 1.0
2 1.0
2 1.0
2.2 2.2
2 1.0
2 1.0
2 1.0
2
2.2
2
2
2.7
2
2
2
2.2
6.7
2
2
2
2
2
2
2
2
2
2,3
1.0
2.2
1.0
20
2.7
1.0
1.0
1.0
22
6.7
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
2.3
REASONABLE
polate to find Mull. Factor
n = 77 37 Hills)
cv = 0.576
which truncates to 0.5
row in M.F. Table - 77
column in M.F. Table- 5
upper 8 lower Mull. Factors and interpolate:
value 1 address = 'mf table'I$F$79
value 1 = 1,4278575
value 2 address = 'mf table'I$G$79
value 2= 1.51907636
Interpolated MF value= 1.49763152
Round to 2 dec. places to get MF:
1.50
F8q)TeX%V ANALYSIS
86
8/27/2007 <
1
1.0
87
8/29/2007
88
8/30/2007
89
9/4/2007 <
1
1.0
90
9/512007.
91
9/10/2007
92
9/13/2007 <-
1
1.0
93
9/14/2007 :,
94
9/17/2007 <:'
1
1.0
95
9/20/2007 <
1
1.0
96
9/24/2007 .
97
9/26/2007 <I
1
1.0
98
10/1/2007
3.5
3.5
99
10/5/2007
100
10/8/2007
1.7
1.0
101
1CV1012007
102
10/15/2007
103
10/16/2007 <
1
1.0
104
10/17/2007
105
10/22/2007
108
1012912007. <'.
1
1.0
107
10/31/2007 '
108
11/1/2007
109
11/5/2007
1.4
1.0
110
111WO07 <
1
1.0
111
11/9/2007
112
11/10/2007
113
11/12/2007
114
11/13/2007
1.3
1.0
115
1111412007-
116
11/19/2007
1.1
1.0
117
11/21/2007
118
11/26/2007 <,
1
1.0
119
11/27/2007
120
12/2/2007 <'
1
1.0
121
12/3/2007
122
12/5/2007
123
12/10/2007 <:
1
1.0
124
l2/lX2007
125
12/17/2007
126
12/18/2007 <
1
1.0
127
12/19/2007 <
1
1.0
128
12/26/2007
129
12/31/2007 <
1
1.0
130
1/2/2008 <
1
1.0
131
1O12008
132
1/14/2008 <
1
1.0
133
1/16/2008
134
1/22/2008 <.
1
1.0
135
1/23/2008
136
1/28/2008 <
1
1.0
137
1130/2008
138
2/4/2008-
139
2/5/2008
1.1
1.0
140
21612008-
141
2/11/2008 <
1
1.0
142
2114/2006-
143
2/18/2008 <
1
1.0
144
2/20/2008 <
1
1.0
145
2J27/2008<
1
1.0
146
3/5/2008
147
3/10/2008 <
1
1.0
148
3112/2008
149
3/18(2008 <
1
1.0
150
3/19/2008 <
1
1.0
151
3/26/2008
1
1.0
162 April <
1
1.0
153
<
1
1.0
154
<
1
1.0
155
<
1
1.0
Interpolate to find Mult Factor Mercury
n= 73 26 Hills)
cv = 0.466
which truncates to 0.4
Find row in M.F. Table - 73
Find column in M.F. Table - 4
Fick upper 8 lower Mull. Factors and interpolate:
value 1 address = 'mf table'!$E$75
value i = 1.3500103
value 2 address = 'mf table'!$F$75
value 2= 1.44481977
Interpolated MF value= 1.4126832
Round to 2 dec. places to get MR McDo ell rpal$009 xtm.xls, data
-2- 4/22/2009

++ REASONABL POTENTIAL ANALYSIS
Nickel I Zinc
Date Data
L4pL=1/2DL
Results
Dale Data
BDL-1/2DL
Results
1
1/2/2007
2.4
2.4
Std Dev,
0.7865
1
1/212D07
40
40.0
Std Dev.
8.1511
2
1/3/2007
Mean
2.2870
2
11312D07
Mean
47.8571
3
1/4Y2007
2
1.0
C.V.
0.3439
3
1/412D07
33
33.0
C.V.
0.1703
4
118/2D07
n
77
4
1/8/2D07
n
77
5
1/10/2007
5
1/10/2007
6
1/16/2007
2.2
2.2
Mull Factor =
1.2900
6
-11161=7
37
37.0
Mull Factor =
1.1400
7
1117/2007
2.1
2.1
Max. Value
4.0 ug/L
7
1/17/2007
39
39.0
Max. Value
100.0 ug/L
8
1/18/2007
Max. Pred Cw
5.2 uglL
8
1/18/2007
Max. Pred Cw
114.0 uglL
9
1/22/2007
2.4
2.4
9
1/22/2007
42
42.0
10
1/24/2007
10
1/2412D07
11
1129=7
2
1.0
11
1/2912D07
44
44.0
12
1/3112D07
12
1/31/2007
13
2/212007
2.3
2.3
13
2/2/2007
51
51.0
14
2/812007
14
2/6/2D07
15
2M/2007
2
1.0
15
2/8/2007
43
43.0
16
2/12/2007
16
2/1212007
17
2/14/2007
2
1.0
17
2l14/2007
46
40.0
18
2119/2007
18
2/19/2007
19
2/20/2007
2.1
2.1
19
2/20/2007
46
46.0
20
2/21/2007
20
2121/2007
21
2/26/2007
2.3
2.3
21
2/26/2007
40
40.0
22
2/2812007
22
2/28/2007
23
312/2007
2.6
2.6
23
3/2/2007
47
47.0
24
3/5/2007
24
3/5/2007
25
3/912007
9 a
9.1
25
39/2007
49
49.0
26 3/12/2007
27 3/13/2007
28 3/1412007
29
3/20/2007
2
1.0
30
3/21/2007
31
3/2212007
2.3
2.3
32
3/26/2007
2.4
24
33
3/27/2007
34
4/2/2007
35
4/4/2007
2.3
2.3
36
4/9/2007
37
411012D07
38
4/11/2007
2.3
2.3
39
4/13/2007
40
4M4/2007
2
1.0
41
4/1612D07
42
4117/2007
2
1.0
43
4/23/2007
44
4/25/2007
45
4/30/2007
2.2
2.2
46
511/2D07
2.4
2.4
47
SW2007
48
5/6/2007
2
2.0
49
5/7/2007
50
5/14/2007
51
5/1612D07
2.6
2.6
52
5/21/2007
53
- 5/2212007
54
5/23/2007
2.6
2.6
55
5/29/2007
2.6
2.6
56
-sW12D07
57
614/2D07
3.2
3.2
58
6/1112007
59
6/1212007
60
6/13/2007
61
6/15/2D07
62
6/18/2007
2.5
2.5
63
6/20/2007
64
6/21/2007
65
6/25/2007
2.5
2.5
66
6/27/2007
2.2
2.2
67
6/28/2007
2.6
2.6
68
7/2/2007
' 69
7/9/2007
70
7/11/2007
2.8
2.8
71
7/16/2007
72
7/17/2007
73
7/18/2007
2.8
28
74
7/23/2007
3.8
3.8
75
7/25/2007
76
7/30/2007
3
3.0
77
8/i/2007
78
8/2/2007
2
1.0
79
8/6/2007
80
8/8/2007
2.7
2.7
81
8/13/2007
82
8/14/2007
83
8/15/2007
2
2.0
26 3/12/2007
27 3/13r2007
28 3114/2007
29 3/20/2007
30 3/21/2007
31 3/22/2007
32 3/2612007
33 3127/2007
34 4/21M07
35 4l4/2007
36 4l9/2007
37 4/1012007
38 4/11/2007
39 4/13/2007
40 V14/2007
41 4/16/2007
42 4/17/2007
43 4/23/2007
44 4/2512007
45 4/30/2007
46 5/112007
47 5/312007
48 5/612007'
49 6f7J2D07
50 5/14/2007
51 5116I2007
52 5/21/2007
53 5/22/2007
54 5/23/2007
55 5/29/2007
56 5/30/2007
57 6/4/2007
68 6/11/2007
59 6112I2007
60 6/13/2007
61 6/15/2007
62 6/18/2007
63 6/20/2007
64 6121/2007
65 6125/2D07
66 6/27/2007
67 6/28/2007
08 712/2007
69 7/9/2007
70 7/11=7
71 7/1612007
72 7/17/2007
73 7/18/2007
74 7/23/2007
75 7/25/2007
76 7/30/2007
77 811/2007
78 8/2J2D07
79 8B/2007
80 e1812007
81 8/13/2007
82 8/14/2007
83 -1 8/15/2007
53
49
56
44
43
43
43
48
51
53
45
44
57
53
+T
45
40
55
47
54
53
52
100
44
i
53.0
49.0
56.0
44.0
43.0
43.0
43.0
48.0
51.0
53.0
45.0
44.0
57.0
53.0
52.0
45.0
40.0
55.0
47.0
54.0
53.0
52.0
100.0
44.0
52.0
McDowell rpa 2009 exl
ds. data

84 8/20/2007
85 8/22/2007
86 8/27/2007
87 8/29/2007
88 8/30/2D07
89 9/4/2007
90 915/2D07
91 9/10/2007
92 9/13/2007
93 9/14/2007
94 9/17/2007
95 9/20/20D7
96 9/24/2007
97 9/2612007
98 10/1/2007
99 10/5/2007
100 10/8/2007
101 10/10/2007
102 10/15/2007
103 10/16/2007
104 10/17/2007
105 10/22/2007
106 10/29/2007
107 10/31/2007
108 11/1/2007
109 11/5/20D7
110 11/6/2007
111 1119/2D07
112 11/10/2007
113 11/1212007
114 11/13/2007
115 11/14/2007
116 11/1912D07
117 11/21/2007
118 11/26/2007
119 11/2712007
120 12/2/2007
121 121312D07
122 12/5/2007
123 12/1012007
124 12/12(2007
125 12/17/2007
126 12/18/2007
127 12/1912007
128 12/2B/2D07
129 12/31/2007
130 1/2/2008
131 117/2008
132 1/14/2008
133 1/16/2008
134 1/22/2008
135 1/23/2008
136 1/28/2008
137 1/3012008
138 21412008t
139 215/2008t
140 2/6/20081
141 211112D08 `.
2
22
2.2
2
10
2.2
2.2
1.0
2.9 2.9
2.7 2.7
2.6 2.6
2.6 2.6
2.8 2.8
2.4 2.4
2.1 2.1
2 1.0
2 1.0
2 1.0
3.3 3.3
2.1 2.1
2 1.0
2.1 2.1
2.2 2.2
2.4
2
2
2
2.9
2.6
3.3
2.7
2.7
2A
1.0
1.0
2.0
2.9
2.6
3.3
2.7
2.7
REAS
142 2/14/2D08 2.6 2.6
143 2118/2008 2.6 2.6
144 2120/2008' 3.5 3.5
145 2/27/2008 22 22
146 3/5/2008'
147 3/10/2008'. 3 3.0
148 3/12/2008
149 3/18/2008 3.4 3.4
150 3/19/2008 3.4 3.4
151 3/26120081- 3.3 3.3
152 April 3.2 3.2
153 3.6 3.6
154 4 4.0
nterpolate to find Mult. Factor
n = 77 61 Hits)
cv= 0.344
which truncates to 0.3
Ind row in M.F. Table - 77
'Ind column in M.F. Table- 3
'ick upper & lower Mult. Factors and interpolate:
value 1 address = 'mf table!$D$79
value 1 = 1.24775324
value 2 address = 'mf table'I$E$79
value 2 = 1.33707032
Interpolated MF value = 1.28694485
Round to 2 dec. places to get MF:
1.
9� 41��
86 8/27/2007.
87 8129/2007
88 8/30/2007
89 9/4/2007
90 9/5/2007
91 9/10/2007
92 9113/2007
93 9/14/2007
94 9117/2007
95 9/20/2007
96 9/24/2007
97 9/26/2007
98 10/1/2007
99 10/5/2007
10D 10IW2007
101 10/10/2007
102 10/1512007
103 10/16/2007
104 10/17/2007
105 10/22/2007
106 10/29/2007
107 10/31/2007
108 l l/l/2007
109 11/5/2007
110 11/6/2007
111 11/912007
112 11/10/2007
113 11/12/2007
114 11/13/2007
115 11M412007
116 11/1912007
117 11/21/2007
118 11/26/2007
119 11/27/2007
120 12/2/2007
121 12/312007
122 12/5/2007
123 12/10/2007
124 12/12/2007
125 1211712007
126 12118/2007
127 12/19/2007
128 12/26/2007
129 12/31/2007
130 1/2/2008
131 1/7/2008
132 1/14/2008
133 l/16/2008
134 1IM2008
135 1/23/2008
136 1/28/2008
137 1/30/2008
138 2/4/2008
139 2/5/2008
140 2/6/2008
141 2/11/2008
ANALYSIS
48 48.0
53 53.0
55 55.0
48 48.0
46 46.0
37 37.0
36 36.0
41 41.0
42 42.0
42 42.0
35 35.0
52 52.0
43 43.0
47 47.0
44 44.0
52 52.0
53 53.0
44 44.0
55 55.0
46 46.0
55 55.0
51 51.0
44 44.0
53 53.0
51 51.0
44 44.0
42 42.0
51 51.0
142 2/14/2008 46 46.0
143 2/18/2008 51 51.0
144 2/2012008 54 54.0
145 2/27/2008 51 51.0
146 3/5/2008
147 3/10/2008 47 47.0
148 3/12/2008
149 3/18/2008 46 46.0
150 3H9/2008 52 52.0
151 3126/2008.. 46 46.0
152 April 45 45.0
153 50 50.0
154 54 54.0
interpolate to find Mult. Factor
n = 77 77 Hits)
cv= 0.170
which truncates to 0.1
=ind row in M.F. Table - 77
=ind column in M.F. Table - 1
Dick upper & lower Mult. Factors and interpolate:
value 1 address = 'mf tablel$B$79
value i = 1.07811324
value 2 address = 'mf table) $C$79
value2= 1.1610489
Interpolated MF value = 1.13643421
Round to 2 dec. places to get MF:
xtra.xls, data 2
4/2212009

Grzyb, Julie
Subject: FW: Reuse at McDowell WWTP
Jackie Jarrell of CMUD was notified on the Divisions decision to remove the reuse clause from the final permit for the
McDowell WWTP and to pursue a non -discharge permit from Aquifer Protection on 6-26-09 at 4:50 PM.
Julie Grzyb
From: Risgaard, Jon
Sent: Friday, June 26, 2009 12:54 PM
To: Grzyb, Julie
Cc: Belnick, Tom
Subject: RE: Reuse at McDowell WWTP
Julie,
Thanks for getting the'proposed language and alternatives together. I feel strongly that for any facility desiring to use
the effluent as reclaimed water, they must be made aware of the appropriate limits and be able to demonstrate that
they are in fact meeting all of the reclaimed water standards. While I believe that McDowell facility is capable of
meeting all of the standards, if we can't figure out a way of including all of the limits in the NPDES permit, than I feel we
need to direct CMUD to pursue a minor permit from the Aquifer Protection Section (APS) for the generation and use of
reclaimed water. I understand Tom's concerns with properly monitoring and enforcement of the system. While I doubt
that CMUD would abuse the system and cause a problem, for the sake of consistency it may be best to continue to
require permits from both sections. Please advise them that they may wish to seek a permit for either a bulk fill station
or for a permit specifying the fields where the which to irrigate. They can contact me for information on how to seek the
permit.
Thanks again for brainstorming ideas to try to make this work, and for taking the time to meet with me and talk with
CMUD staff. I am interested in finding ways to facilitate the use of reclaimed water and there may be cases in the future
where it can be more seamlessly be added to an NPDES permit.
Jon
From: Grzyb, Julie
Sent: Friday, June 26, 2009 10:20 AM
To: Risgaard, Jon
Subject: Reuse at McDowell WWTP
Jon,
After further discussion, Tom is concerned about the enforcement and tracking of any additional limitations not put on
the Effluent and Limitations page which will not make it to a DMR. The turbidity limit we discussed is fine because they
will have an instantaneous reading. Additional Fecal and TSS limits would not be tracked. I suggest the following:
1) Go with the permit as stated below, trusting that McDowell's tertiary treatment is sufficient for this use
2) Require that the effluent be treated using membrane filtration (this treatment is what they installed for their
reclaimed water use facility and would be additional treatment to their existing effluent.. According to our

discussion on the phone it sounded like they were going to use this treatment on the reclaimed effluent anyway,
this would assure TSS and fecal coliform limits are being met.
3) Have them get a non -discharge permit.
I was hoping to come up with a standard clause that could be used if a facility had a real need for several thousand
gallons of reclaimed tertiary treated effluent (i.e. option number 1). However, if they come back requesting to reuse a
significant amount of wastewater that should be tracked and monitored more closely, I am thinking they should simply
apply for a non -discharge permit.
Let me know what you think,
Julie
Revised NPDES permit clause on Reuse:
SUPPLEMENT TO PERMIT COVER SHEET
1. Reuse less than XXX gallons per day of non -potable treated effluent for watering rain gardens
on the property of the McDowell Creek Wastewater. Treatment Plant in accordance with
condition A. (4.) of the permit.
A. (4.) Reuse of Tertiary Treated Effluent
Mallard Creek WRF is authorized to use less than XXXX gpd of tertiary treated effluent for watering the rain gardens
within the perimeter of the existing wastewater treatment plant provided the following conditions are met:
a) Use of tertiary treated effluent will supplement rainfall during dry periods of the year only;
b) No runoff or ponding shall occur from the irrigated areas;
c) Trucks or areas around the hoses carrying the effluent for watering shall identify the source as non -
potable water not to be used for drinking water.
d) All irrigation shall occur within the fenced perimeter of the wastewater treatment plant with controlled
public access. Such controls may include the posting of signs showing the activities being conducted at each
site.
e) Permission to use the tertiary treated effluent for watering shall not relieve the Permittee of the
responsibility for damages to ground or surface waters resulting from the distribution of tertiary
treated effluent on the rain gardens.
fl Tertiary treated effluent shall not be applied within 100 feet of a drinking water well.
g) The quality of the effluent used for watering shall not exceed the limitations specified in Section A. (1.)
of your NPDES Permit. In addition, the reclaimed effluent shall not exceed a turbidity limit of 10 NTU's.
Turbidity shall be monitored using a continuous recorder.
h) The Permittee shall maintain records at the facility tracking the amount of reclaimed effluent used for watering
the rain gardens. These records shall include the following information:
i. Date of distribution
ii. Daily estimated volume of reclaimed effluent
iii. Weather conditions
iv. Turbidity
i) An education program shall be developed and implemented to inform employees of the proper use of
reclaimed water. These materials shall be maintained consistent with the reclaimed water uses. All
educational materials shall be made available to the Division upon request.
Julie A. Grzyb, Environmental Engineer
NC DENR / Division of Water Quality / Surface Water Protection Section
NPDES West, Point Source Branch

Julie Grzyb
NPDES Unit, Western Program
NC-DENR
1617 Mail Service Center
Raleigh, NC 27699-1617
Re:
Dear Ms. Grzyb,
•
AM
CHARLOTTE:M
Draft Permit
McDowell Creek WWTP
NPDES #NC0036277
Mecklenburg Co.
RECEIVED
JUN 2 4 2009
DENR - WATER QUALITY
POINT SOURCE BRANCH
Thank you for submittal of the Draft Permit for McDowell Creek WWTP for our review. For the
most part we agree with the terms of this permit and find them acceptable. However, we do
object to Part A. (4) Reuse of Treatment Plant Effluent.
This part of the permit was intended to be used at McDowell to water the rain gardens that were
installed at the plant as bio-filters for storm water. During drought conditions these plant may
die without watering. The objectionable parts of this permit condition require metering of the
treated effluent used for irrigation and restricts the volume of water that may be applied. There
are 23 rain gardens on this site that were installed to meet the highest possible Best Management
Practices (BMP's) to keep silt out of the surface waters. With the current requirements we may
have to install as many as 23 meters. The limits on the volume of water may not allow us to soak
the plants enough to keep them alive during drought conditions.
We are willing to accept other restrictions on this, such as:
• The effluent may only be used for watering on the rain gardens;
• Watering may only occur during low rainfall periods_ etc. _
If we could arrange a meeting with us and State personnel to discuss how this may be resolved
that would be very helpful. I believe we could meet via a phone conference if that is alright with
all of the parties.
Thank you for your assistance with this issue,
7acqu'ellel Jarrell, P.E.
Superintendent Environmental Management Div.
Charlotte Mecklenburg Utilities
CHARLOTTE-MECKLENBURG UTILITIES
Environmental Management Division 4222 Westmont Drive
Charlotte, NC 28217
Phone: [phone]

t
Grzyb, Julie
From: Grzyb, Julie
Sent: Tuesday, June 02, 2009 4:23 PM
To: Belnick, Tom
Subject: FW: NCO036277 McDowell Creek WWTP
From: [e-mail] [[e-mail]]
Sent: Tuesday, June 02, 2009 10:05 AM
To: [e-mail]
Subject: NCO036277 McDowell Creek WWTP
EPA has reviewed this permit and has no comments.
1

Beverly Eaves Perdue
Governor
NCDENR
North Carolina Department of Environment and
Division of Water Quality
Coleen H. Sullins
Director
May 20, 2009
MEMORANDUM
To: Britt Setzer
NCDENR / DEH / Regional Engineer
Mooresville Regional Office
From: Julie Grzyb
NPDES Unit
Subject: Review of Draft NPDES Permit NCO036277
Natural Resources
RECEI'VED
MAY
DENR - WATER QUALITY
POINT SOU . E BRANCH
McDowell Creek WWTP
Mecklenburg County
Please indicate below your agency's position or viewpoint on the draft permit and return this form by June 26, 2009. If
you have any questions on the draft permit, please contact me at [phone] or e-mail [e-mail].
RESPONSE: (Check one)
Concur with the issuance of this permit provided the facility is operated and maintained properly, the
stated effluent limits are met prior to discharge, and the discharge does not contravene the designated
water quality standards.
❑ Concurs with issuance of the above permit, provided the following conditions are met:
Opposes the issuance of the above permit, based on reasons stated below, or attached:
1617 Mall Service Center, Raleigh, North Carolina 27699.1617
Location: 512 N. Salisbury St. Raleigh, North Carolina 27604
Phone: 919.807-M \ FAX: [phone] \ Customer Service:1-877-623-6748
Internet: www.ncwaterqualit .org
An Equal Opportunity \ Affirmative Action Empoyer
No e hCarolina
Natura!!r,

The CharLotte Observer PubLishing Co.
Charlotte, NC
North Carolina } as Affidavit of Publication
Mecklenburg County}
THE CHARLOTTE OBSERVER
DINA SPRINKLE
NCDENR/DWO/POINT SOURCE BRANCH
1617 MAIL SERVICE CENTER
RALEIGH NC 27699
REFERENCE: 30063432
6346732 Wastewater Permit
Before the undersigned, a Notary Public of said
County and State, du Ly 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 Caro Linal
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 correct Ly copied from
the books and files of the aforesaid Corporation
and Publication.
PUBLISHED ON: 05/22
AD SPACE: 74 LINE
FILED ON: 05/29/09
NAME: O.CIrI'if `U.l (J��YL= TITLE: , yMr(
��� DATE:
In Testimony Whereof I have hereunto set my hand an of e
day and yefir aforesaid;,_ _ q
Notar / I l -fly Ofnmission Expires
Public Notice
None Carolina ErNlmnnuum.1 Management Comme sloe NPOES
Unit
1617 Meil SBNice Carney
Baleigb. NC 27699-1617
Notice of Intent to Issue a NPOES Wastewater Permit
The North. Carolina Erimmrnemel Management Commission
Proposes to
issue a NPDES waWawater discharge permit to Rye
ssteel
Written umilt 3e days stra, Bob the
pub ah posed late of thabases. ll
be
Bable raof athe NO DMuch of Water Oualiry (OWO) m2y hold e
— .. n .., w,... in three as a significant occurs of public
on
or
Rowan Associates & Mercantile requestaa renewal of NCOO6t034
for b, Rower jimecades & Mercantile WV1fP In Rowan County.
unnamed t buaq W ranitted Town Creeksto Me Yadlon Pea Oeearred wastewater t River
Benin.
Weslslde Swim & Racquet Club requested renewal of permit
NCBo4243 in Rowan County This permuted discharge is formed
tlomastic wastswetef to Braes Branch in the )(ionnoPea Dee Rrvar
Basin.
my seal, the
My Commission Expires May 27, 2011

SOC Priority Project: No
To: Western NPDES Program Unit (�
Water Quality Section f
Attention: Dina Sprinkle
; I AUG - 7 2008'
Date: August 4, 2008 (__ `
DE'-R RATER :' LI {
NPDES STAFF REPORT AND RECOMMENDATION---
County: Mecklenburg
Permit No. NCO036277
PART I - GENERAL INFORMATION
Facility and Address: Charlotte Mecklenburg Utilities
McDowell Creek WWTP
5100 Brookshire Boulevard
Charlotte, North Carolina 28216
2. Date of Investigation: 8-01-2008
3. Report Prepared by: Samar Bou-Ghazale, Env. Engineer II
4. Persons Contacted and Telephone Number: Mr. Pete Goins Jr., [phone]
Directions to Site: From the intersection of SR 2128 (Beatties Ford Road) and SR 2074 (Neck
Road), travel west on SR 2074 approximately 1.9 miles. The W WTP is located on the right
side of SR 2074 after crossing McDowell Creek.
6. Discharge Point(s), List for all discharge points:
Latitude: 350 22' 54" Longitude: 80° 56' 20"
Attach a USGS map extract and indicate treatment facility site and discharge point on map.
U.S.G.S. Quad No.: F15NW U.S.G.S. Quad Name: Lake Norman South, NC
Site size and expansion area consistent with application? Yes.
8. Topography (relationship to flood plain included): Slopes range from 2 to 4%, the W WTP is not
in a flood plain.
9. Location of nearest dwelling: None within 1000 feet.
10. Receiving stream or affected surface waters: McDowell Creek

t
Page Two
l
a. Classification: WS-IV
b. River Basin and Subbasin No.: Catawba 030833
C. Describe receiving stream features and pertinent downstream uses: Receiving stream is
approximately 50 feet wide x 3-5 feet deep. A CMU water intake is located a few miles
downstream on Mountain Island Lake. The lake is used for primary and secondary
recreation as well as water supply source.
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. a. Volume of wastewater to be permitted: 12.0 MGD (ultimate design capacity)
b. Current permitted capacity of the wastewater treatment facility: 12.0 MGD
C. Actual treatment capacity of the current facility (current design capacity): 12.0 MGD
d. Date(s) and construction activities allowed by previous Authorizations to Construct issued
in the previous two years: NIA
e. Please provide a description of existing or substantially constructed wastewater treatment
facilities: The existing WWT facilities consist of influent pump station with influent
screening and Vortex grit removal, one 1.3 million gallon flow equalization day tank, two
6 million gallon storm flow equalization basins for a total of 12 million gallon, five
clarifiers, 4 trains biological treatment, four final clarifiers, sludge pump station,15 MGD
RAS/WAS pumping station, five anaerobic digesters (four primary and one secondary).
The secondary digester is a gas scrubbing system, a blower building, a lime storage and
feed facility, a chemical storage and feed facility, a chlorine contact tank for membrane
feed, two distinct effluent filter with UV disinfection, cascade post aeration and stand-by
power supply.
f. Please provide a description of proposed wastewater treatment facilities: N/A
g. Possible toxic impacts to surface waters: This facility has a good compliance history with
toxicity testing results.
h. Pretreatment Program (POTWs only): CMU has an approved pretreatment program.
There are no significant industrial users permitted to discharge process wastewater to the
WWTP.
2. Residuals handling and utilization/disposal scheme:
a. Residuals are land applied. DWQ Permit No. WQ0000057.

Page Three
Residuals Contractor: Synagro, Inc.
b. Residuals stabilization: PSRP
C. Landfill: Waste from the grit chamber and bar screen is taken to Mecklenburg County.
landfill.
3. Treatment plant classification: Class IV
4. SIC Code(s): 4952 Wastewater Code(s) 01 Main Treatment Unit Code: 11113
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
2. Special monitoring or limitations (including toxicity) requests: None at this time.
3. Important SOC, JOC or Compliance Schedule dates (Please indicate): N/A
4. Alternative Analysis Evaluation: N/A
5. Air quality and/or groundwater concerns or hazardous materials utilized at this facility that may
impact water quality, air quality, or groundwater: No AQ or GW concerns nor are hazardous
materials utilized at this facility.
PART IV - EVALUATION AND RECOMMENDATIONS
The permittee, Charlotte -Mecklenburg Utilities, has applied for Permit renewal for the subject
facility. The WWTP appeared in good operational condition at the time of the investigation.
This facility was expanded in 2004 from 6 to 6.6 MGD. Also, in 2004 this facility requested
an A to C to expand from 6.6 to 9 MGD and later from 9 to 12 MGD. The expansion was completed
in 2007. It should be noted that the new discharge point is approximately 100 feet up -stream of the
old discharge point.
Pending review and approval by the Western NPDES Program Unit, it is recommended that
the permit be renewed as requested.
Signature of report rep Date
Water Quality Regional Supervisor D e

13be6 �5
I V14
RIO& 491900 1
1
IU
M. -
NPDES/A uifer Protection Permitting Unit Pretreatment Information Request Form
PERMIT WRITER COMPLETES THIS PART: PERMIT WRITERS - AFTER you get this form
Date of Requestl 2/26/2009
Facility Name CMU McDowell Creek
Permit Number NCO036277
Region MRO
Basin Catawba
check applicable PERCS staff:
Check all that
apply
aacK rrom rtrtUs
- Notify PERCS if LTMP/STMP data we said should
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.
municipal renewal
x
new industries
WWTP expansion
Speculative limits
stream reclass.
stream relocation
7010 change
otherl
✓ jCTB, CHO. LUM, NEW, ROA - Dana Folle 523
HIW, LTN, NEU, YAD - Monti Hassan 371
BRD, CPF, FRB, TAR - Sarah Morrison (208)
Listed as having a pretreatment program but zero non -categorical
SIU's and zero CIU's
PERCS PRETREATMENT STAFF COMPLETES THIS PART: G y� ! . P�'�o a� GCiF7j"N�Status of Pretreatment Program (check all that apply)'r`V1,
1) facility has no SIU's, does have Division approved Pretreatment Program that is INACTIVE
2) facility has no SIU's, does not have Division approved Pretreatment Program
3) facility has SIUs and DWQ approved Pretreatment Program (list "DEV" if program still under development) C ttAA,
3a) Full Program with LTMP
3b) Modified Program with STMP
4) additional conditions regarding Pretreatment attached or listed below TMP time
ost re t:
Flow, MGD Pe i ed Actual Time period for Actual Next cle: -
da
Indust al
Uncontrollable n/a
G POC due to C✓ l V I
POC In Parameter of NPDES/ Non- Required POTw POC 4Fq
LTMP
LTMP/ Concern (POC) Disch Permit Required by 603 POC due (Explain Ent Effluent Ob
S P Check List Limit b EPA' Slud e * to SIU1 below "" Fr
4Q M
Q = Quarterly
M = Monthly
all data on DM
YES
NO attach data)
data ins readshi
YES email to writer
NO
4 1 UM
4 1 QM
4 1 Q M
vays`in the LIMP/STI�IIP ;_ " Only in LTMP/STMP If sludge land app 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
:omments to Permit Writer (ex., explanation of any POCs: info you have on IU related investigations into NPDES problems):
lq5
McDowell Creek NPDES_Pretreatmentrequestfortn.feb20a8-1
Revised July 24, 2007

RE: spray it igation
Subject: RE: spray irrigation
From: "Padgett, Dawn" <[e-mail]>
Date: Fri, 20 Mar 200915:37:04 -0400
To: "'Julie Grzyb"' <[e-mail]>
CC: "Jarrell, Jackie" <[e-mail]>
Thanks Julie - I think this would be a good idea, the only thing we don't have is a
quantified meter, I think we can get something for this.
Thanks for thinking about us.
Also, did you get my voice message asking about the McDowell NOV for TRC? I asked
Jackie about this and she had not seen it. I would object to the NOV based on the
footnote in the existing permit - Footnote #4 for Total Residual Chlorine "Limit and
monitoring only apply is effluent is chlorinated". Since we do not chlorinate the
effluent (I think the result was from an interference), this limit does not apply.
If you could let us know when this was sent and who received it, I would appreciate
it.
Thanks, Dawn
-----Original Message -----
From: Julie Grzyb [mailto:[e-mail]]
Sent: Friday, March 20, 2009 3:08 PM
To: Padgett, Dawn; Jarrell, Jackie
Subject: spray irrigation
Dawn,
There is a standard clause that can be put into a NPDES permit for reuse
of non -potable ,'treated
effluent for irrigation and dust control on the property of the
permitted facility in accordance with the
following conditions:
A.(1.) SPRAY IRRIGATION CONDITION
The spray irrigation of tertiary treated effluent around the existing
wastewater treatment facilities is authorized by the Division under the
following conditions:
* 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
* Irrigation shall occur within the fenced perimeter of the wastewater
treatment plantl,with controlled public access.
Would you be interested in having this put in the McDowell Creek permit?
It is also possible to allow for additional internal uses (i.e.
restrooms, HVAC system, and vehicle wash down) along with the conditions
above and:
* The reuse water will be used by plant personnel who are trained
and knowledgeable about water reuse.
* An RPZ device will be required onsite to protect the potable water
1 of 2 3/20/2009 4:42 PM

RE: spray irrigation f
r
supply.
* No runoff shall occur from the vehicle wash down or irrigated areas.
If you are interested in using treated water for irrigation at McDowell
during dry periods
please let me know because a clause like this should be put in the permit.
Also, I know Mallard Creek has a permit for water reclamation but if it
does not specify that you can use it around the facility for irrigation
I can put it in Mallard's permit as well - if wanted.
Julie
Julie Grzyb
Environmental Engineer
NPDES West/ DWQ
N.C. Dept. of Environment and Natural Resources
1617 Mail Service Center, Raleigh, NC 27699-1617
[phone]; fax [phone]
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.
2 of 2 3/20/2009 4:42 PM

Mi hu-11 U LVCy va- 1
WiUleaa G Russ JF . "
NOM Catolasl Lk] uuwnf of Fnrarnnneut 41dN=94d Hetawt
CUIctu }1 ..^.nllml, I hlCtt T
Augusl B. 2008 S, r.r.� doe °r%'
gERTIFIED MAIL 700 14SU 0004 4510 0202
RETURN RECEIPT RiQUESTED
Ms. Jacqueline a. Jai lell
C',hnrlotte Mecklenburg UlililieS
42V Westmont Drtve
Charlotte, Wirth Caroll a 28217
Subjecd. Notice of Violation - Effluent Limitations
Tracking #. NOV-2008-uV-0383
McDowell Creek VVW I I'
NPDES Permit No.
M6cklernburg County
Dear Ms. Jarrell*
A iaview ul the April 111113 somiIf-mnniforing report for the hubjw;1 facility revealed a
violation of the following pdIameter.
Pipe Parim ctcr Repotted valuc Permit Limit
001 TR 9U ugn (daily mAylmum) 18 uyll (daily maxlntum)
Remedial acliul eS, if tut already Implr►me►nled. should be taken to cui1u l any problem
The Division of Water uallly 1pay pursue enfnrr ment actions for this and any uddiliunal
vininfinns If the violations are Ur A t~ulduluinq nature, not related to operation and/w
mnlntPnAnrn prnbtem-arld yuu anticipate remedial constnirtinn ar:tivities. then you may wise
to consider Applying R; a Spbt;lal Order by Consent. You may rnntn& Mr. John Lesley of the
Ciffice for addirinnal in rmation.
If you have hie etinn, conceritirty lhib lildtter. please do not hesitate to enntnr:t Mr.
Lesley or me at 70Al43,'I BOO.
Robert B. K1 tlUb
Surface Watei PiuteCtwn
' Regional Supervisui
M Pu1111 Suutc.d ranch
MeukleitLuiy uuoty Water Uuality Protection
MOPE Aadrtss rkw•• (144) rd..1.1699 r,Ocacian l,> � �u•,1 ••
610 MCI l.CQW1 Avinur, Sulu l 1 btu hart IC.elntet AWDUC, SURC S01 ;UAltdi
1 fdooftsv7b, NC J8115 DdaOreevilic.WonhCa waso
FOR+ncr vvw acxrten • ■1.1 In, CactamerS#mcr IJI17-67.' VAB
j gnF�pul�flly ■l�.tdriAliuntil eeAClrontmobYer—> KCCt'ClCdflO'riPOLIC01IN11 fP4W'
A 0 #
L
"t L' 0
W 5 L `oZ
IVII18ON
LOOSH Ot L6
@ION
jjnsa8
aged
awil
IaejS
apoW
.lagwnN 8uogd/x8J
9V:SL 60OZ OZ aeW
L'd
4CAC :I— —A 0CIa8 -=�uai:3 :�. i W S U e A 1 AK*C
56V9t086 L6 :xed aa.lnoS Iu i od 08a

Qatd
Flow
Eff
As
Cd
Cr
Cu
Pb
Hg
Mo
Ni
Se
Ad
Zry
CN
ug/l
ug/I
ug/l
/l
u I
ng/l
ug/l
ug/I
ug/l
g/l
/l
ug/I
1 /1 /2007
5.6
5.6
1/2/2007
5.4
5.4
1
<10.00
1 /3/2007
5.21
5.2
<1.00
1 /4/2007
5.31
5.3
<5.00
<1.00
<5.00
2.4
<5.00
<5.00
2.4
<5.00
<5.00
40
1 /5/2007
5.3
5.3
1 /6/2007
6
6
1 /7/2007
6.5
6.5
1 /8/2007
7.8
7.81
1
<10.00
1 /9/2007
5.8
5.8
1/10/2007
5.4
5.4
<5.00
<1.00
<5.00
<2.00
<5.00
<1.00
<5.00 1
<2.00
<5.00
<5.00
33
<10.00
1 /11 /2007
5.4
5.4
1 /12/2007
5.4
5.4
1 /13/2007
5.4
5.4
1 /14/2007
5.41
5.4
1 /15/2007
5.21
5.2
1 /16/2007
4.9
4.91
<10.00
1 /17/2007
4.9
4.9
1.2
1 /18/2007
5.1
5.1
<5.00
<1.00
<5.00
<2.00
<5.00
<5.00
2.2
<5.00
<5.00
37
1 /19/2007
5.1
5.1
1 /20/2007
5.4
5.4
1 /21 /2007
5.51
5.5
i
1 /22/2007
5.8
5.8
<5.00
<1.00
<5.00
<2.00
<5.00
<5.00
2.1
<5.00
<5.00
39
<10.00
1 /23/2007
5.21
5.2
1 /24/2007
5.1
5.1
<1.00
1 /25/2007
5.2
5.2
1 /26/2007
5.1
5.1
1 /27/2007
5.3
5.3
1 /28/2007
5.41
5.41
1/29/2007
5
51
<5.00
<1.00
<5.00
<2.00
<5.00
<5.00
2.4
<5.00
<5.00
42
<10.00
1 /30/2007
5
5
1 /31 /2007
2/1 /2007
_
4.9
5.51_5.5
4.9
1
1__
1.2
2/2/2007
5.11
5.1
<5.00
<1.00
<5.00
<2.00
<5.00
5.8
<2.00
<5.00
<5.00
44
2/3/2007
5.31
�5.4
5
5.3
5.4
J_ 5
I _
2/4/2007
2/5/2007
i
i
2/6/2007
5
5
5
- 5
I
<10.00
2/7/2007
2/8/2007
5
<5.00
<1.00
<5.00
<2.00
<5.00
"<1.00
<5.00
2.3
<5.00
<5.00
51
<10.00
2/9/2007
_5
4.9
4.9
2/10/2007
5.3
5.3
2/11 /2007
5.4
5.4
2/12/2007
5
5
<10.00
2/13/2007
5.2
5.2
2/14/2007
6.4
6.4
<5.00
<1.00
<5.00
<2.00
<5.00
3
<5.00
<2.00
<5.00
<5.00
43
2/15/2007
5.4
5.4
2/16/2007
5.2
5.2
2/17/2007
5.3
5.3
2/18/2007
5.4
5.4
2/19/2007
5.2
5.2
<10.00
2/20/2007
5.11
5.1
<5.00
<1.00
<5.00
<2.00
<5.00
<5.00
<2.00
<5.00
<5.00
46
2/21 /2007
5.1
5.1
4.1
2/22/2007
5.5
5.5
2/23/2007
5
5
2/24/2007
5.2
5.2
2/25/2007
6.31
6.3
2/26/2007
5.5
5.5
<5.00
<1.00
<5.00
<2.00
<5.00
<5.00
2.1
<5.00
<5.00
46
<10.00
2/27/2007
5.3
5.3
1
1_
2/28/2007
5.1
5.11
1
1
_
1
1
1 1.4
Clow JL

Date
Flow
Eff
As
Cd
Cr
Cu
Pb
Hg
Mo
Ni
Se
Ag
Zn
CN
ug/l
ug/l
ug/l
ug/l
ug/l
ng/I
ug/l
ug/l
ug/l
ug/I
ug/l
ugll
3/1 /2007
6.3
6.3
3/2/2007
6.6
6.6
<5.00
<1.00
<5.00
<2.00
<5.00
<5.00
2.3
<5.00
<5.00
40
3/3/2007
11.4
11.4
3/4/2007
6.2
6.2
3/5/2007
61
6
1.4
<10.00
3/6/2007
5.31
5.3
3/7/2007
5.31
5.3
3/8/2007
5.3
5.3
3/9/2007
5.1
5.1
<5.00
<1.00
<5.00
<2.00
<5.00
1.1
<5.00
2.6
<5.00
<5.00
47
<10.00
3/10/2007
5.5
5.5
3/11 /2007
5.6
5.6
3/12/2007
5.41
5.4
1
<10.00
3/13/2007
5.41
5.4
<5.00
<1.00
<5.00
1 <2.00
<5.00
<5.00
2.3
<5.00
<5.00
1 49
<10.00
3/14/2007
5.41
5.4
3/15/2007
5.41
5.4
3/16/2007
6.11
6.1
3/17/2007
5.81
5.8
_
3/18/2007
5.71
5.7
3/19/2007
5.31
5.3
_
3/20/2007
5.1
5.1
,
<10.00
3/21 /2007
5.2
5.2
1.1
3/22/2007
5
5
<5.00
<1.00
<5.00
2.4
<5.00
<5.00
<2.00
<5.00
<5.00
53
<10.00
3/23/2007
5.11
5.1
3/24/2007
5.41
5.4
3/25/2007
5.61
5.6
3/26/2007
5.31
5.3
1.1
_
<10.00
3/27/2007
5.11
5.1
<5.00
<1.00
<5.00
2.3
<6.00
<5.00
2.3
<5.00
<5.00
49
3/28/2007
5.11
5.1
3/29/2007
5.1
5.1
3/30/2007
5.3
5.3
3/31 /2007
5.3
5.3
-�
4/1 /2007
5.3
5.3
4/2/2007
4.9
4.9
<5.00
<1.00
<5.00
2.2
<5.00
<5.00
2.4
<5.00
<5.00
56
<10.00
4/3/2007
5
5
i
<1.00
-
i
4/4/2007
4.9
4.9
4/5/2007
4.9
4.9
-
4/6/2007
5
5
4/7/2007
5.2
5.2
4/8/2007
5.2
5.2
4/9/2007
5.21
5.2
<10.00
4/10/2007
5.11
5.1
<5.00
<1.00
<5.00
2
<5.00
<5.00
2.3
<5.00
<5.00
44
4111 /2007
5
5
1.3
4/12/2007
5
5
4/13/2007
4.6
4.6
<1.00
4/14/2007
51
5
<5.00
<1.00
<5.00
<2.00
<5.00
<5.00
2.3
<5.00
<5.00
43
<10.00
4/15/2007
7.31
7.3
4/16/2007
5.31
5.3
1.7
<10.00
4/17/2007
51
5
<5.00
<1.00
<5.00
<2.00
<5.00
<5.00
<2.00
<5.00
<5.00
43
4/18/2007
5.11
5.1
4/19/2007
5.21
5.2
4/20/2007
5.41
5.4
4/21 /2007
5.41
5.4
4/22/2007
5.51
5.5
4/23/2007
5.11
5.1
<10.00
4/24/2007
5.11
5.1
4/25/2007
5.11
5.1
<5.00
<1.00
<5.00
2.1
<5.00
1.9
<5.00
<2.00
<5.00
<5.00
43
4/26/2007
51
5
4/27/2007
5.3
5.3
4/28/2007
5.2
5.2

Qatd ,
low
Eff
As
Cd
Cr
Cu
Pb
Hg
Mo
Ni
Se
Ag
Zn
CN
ug/I
ug/l
ug/l
ug/l
ug/l
ng/l
ug/l
ug/l
ug/l
ug/l
ug/l
ug/l
4/29/2007
5.4
5.4
4/30/2007
5.11
5.1
<10.00
5/l /2007
51
5
1
<1.00
5/2/2007
51
5
5/3/2007
5.11
5.1
<5.00
<1.00
<5.00
<2.00
<5.00
<5.00
2.2
<5.00
<5.00
48
5/4/2007
5.11
5.1
5/5/2007
5.4
5.4
5/6/2007
5.5
5.5
<5.00
<1.00
<5.00
2.9
<5.00
<5.00
2.4
<5.00
<5.00
51
<10.00
5/7/2007
5.1
5.1
1
1 <1.00
<10.00
5/8/2007
5.2
5.2
5/9/2007
5.21
5.2
5/10/2007
5.21
5.2
5/11 /2007
4.91
4.9
5/12/2007
5.3
5.3
5/13/2007
5.3
5.3
5/14/2007
5.2
5.2
<5.00
<1.00
<5.00
3.1
<5.00
<5.00
2
<5.00
<5.00
53
<10.00
5/15/2007
5.1
5.1
5/16/2007
5.11
5.1
1
1.3
5/17/2007
5.11
5.1
_
5/18/2007
5.11
5.1
5/19/2007
5.1
5.1
5/20/2007
5.1
5.1
5/21 /2007
5.2
5.2
<10.00
5/22/2007
51
5
<5.00
<1.00
<5.00
3.1
<5.00
<5.00
_
2.6
<5.00
<5.00
45
5/23/2007
5.1
5.1
<1.00
5/24/2007
5.7
5.7
5/25/2007
5.6
5.6
5/26/2007
5.2
5.2
5/27/2007
5.1
5.1
5/28/2007
5.4
5.4
5/29/2007
5.41
5.4
i
<10.00
5/30/2007
5.3
5.3
<5.00
<1.00
15.00
3.2
<5.00
<1.00
<5.00
_
2.6
<5.00
<5.00
44
<10.00
5/31 /2007
5.3
5.3
6/l /2007
5
5
6/2/2007
5.2
5.2
_
6/3/2007
5.4
5.4
�6/4/2007
5.6
5.6
<5.00
<1.00 <5.00
3.4
<5.00
<1.00
<5.00
2.6
<5.00
<5.00
57
<10.00
6/5/2007
5.71
5.7
6/6/2007
4.91
4.9
6/7/2007
51
5
_
6/8/2007
51
5
6/9/2007
5.21
5.2
6/10/2007
5.11
5.1
6/11 /2007
51
5
<10.00
6/12/2007
4.8
4.8
<5.00
<1.00
<5.00
3.7
<5.00
1
<5.00
3.2
<5.00
<5.00
53
6/13/2007
4.8
4.8
1
6/14/2007
5
5
6/15/2007
5
5
<10.00
6/16/2007
5
5
6/17/2007
5.21
5.2
6/18/2007
5.11
5.1
<10.00
6/19/2007
5
5
6/20/2007
5
5
1.1
6/21/2007
5
5
<5.00
<1.00
<5.00
3.3
<5.00
<5.00
2.5
<5.00
<5.00
52
6/22/2007
4.91
4.9
6/23/2007
5
5
6/24/2007
5.2
5.2
6/25/2007
5.2
5.2
<10.00
6/26/2007
4.91
4.9
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Date
Flow
Eff
As
Cd
Cr
Cu
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Hg
Mo
Ni
Se
Ag
Zn
CN
ug/l
ug/I
ug/l
ugll
ug/l
ng/I
ug/I
ug/I
ug/I
ug/I
ug/l
ug/l
2/18/2008
4.6
4.4
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2/19/2008
5.2
4.5
2/20/2008
4
4.2
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<1.00
<5.00
6.7
<5.00
<1.00
<5.00
2.6
<5.00
<5.00
46
2/21 /2008
4.1
4.1
2/22/2008
4.11
4.3
2/23/2008
4.41
4.4
2/24/2008
4.41
4.4
2/25/2008
4.21
4.3
2/26/2008
4.51
4.4
2/27/2008
4.41
4.6
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<5.00
<2.00
<5.00
<1.00
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2.6
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<5.00
51
2/28/2008
4.3
4.4
2/29/2008
4.2
4.3
3/1 /2008
4.5
4.3
3/2/2008
4.6
4.4
3/3/2008
4.3
4.5
3/4/2008
5
4.6
3/5/2008
5.3
5.2
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<5.00
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<5.00
3.5
<5.00
<5.00
54
<10.00
3/6/2008
4.5
4.8
3/7/2008
5.3
4.7'
_
3/8/2008
5.3
5.1
3/9/2008
4.6
4.61
)
I
3/10/2008
4.6
4.7
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<1.00
<5.00
<2.00
<5.00
<5.00
2.2
<5.00
I <5.00
51
3/11 /2008
4.3
4.5
3/12/2008
4.3
_4.51
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----i-
3/13/2008
4.3
4.4
3/14/2008
4.2
1
3/15/2008
5
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4.7
i-
3/16/2008
5.1
4.91
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3/17/2008
4.51
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3/18/2008
3/19/2008
4.51
4.7
4.8 <5.00
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3
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3/20/2008
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51
3/22/2008
3/23/2008
3/24/200_81
, 4.61
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4.2
4.71
4.6�_
4.4
3/25/2008
4.2
4.5
46
3/26/2008
4.3
4.5
_
15.00
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3.4
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3/27/2008
4.3
_4.2
3/28/2008
4.41
4.41
3/29/2008
4.7
4.3
!
3/30/20081
3/31 /2008
4.6
4.6
4.5
4.7�
April
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<2.00
<5.00
1
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3.4
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<5.00
52
<10.0
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<5.00
<2.00
<5.00
<1
<5.00
3.3
<5.00
<5.00
46
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<5.00
<2.00
<5.00
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3.2
<5.00 I
<5.00
45
<5.00
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<5.00
<2.00
<5.00
<1
<5.00
3.6
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<5.00
50
<5.00
<1.00
<5.00
2.3
<5.00
<1
<5.00
4
<5.00
<5.00
54
all non -detect
all < 5
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RE: NPDES permit renewals for Mallard and McDowell
Subject: RE: NPDES permit renewals for Mallard and McDowell
From: "Padgett, Dawn" <[e-mail]>
Date: Wed, 18 Mar 2009 18:19:40 -0400
To: "'Julie Grzyb"' <[e-mail]>
Hi Julie - the attached letter - residuals mgmt letter.doc should address the sludge
management questions. Please let me know if you need anything else with this.
McDowell does not have a re -use permit. The facility is set up to have a re -use
program, but since there are no customers this has not been pursued.
Also, McDowell does not have any SIU's that discharge to this facility. Though there
are a number of commercial facilities in this basin the wastewater is predominately
residential. I do not have any firm numbers for the percent residential. I can give
you a guess of 95% residential and 5% commercial, but this is a guess. Do you need a
specific number?
Dawn
-----Original Message -----
From: Julie Grzyb [mailto:[e-mail]]
Sent: Wednesday, March 18, 2009 5:48 PM
To: Padgett, Dawn; Jarrell, Jackie
Subject: NPDES',permit renewals for Mallard and McDowell
Dawn,
To complete the renewal applications for NCO030210 and NCO036277 the
following is needed:
Sludge management Plans for Mallard and McDowell Creek.
These were`not requested as part of the NPDES 2A Form but on the
initial permit renewal letter from NCDENR sent on June 8, 2007.
Simply identifying that you have one, the Class type of biosolids, and
that they are land applied in accordance with Permit Number
is sufficient along with a narrative description.
McDowell Creek - identify any non -discharge permits (for reclaimed
water), include amount allowed for reuse and permit number.
Also, for McDowell what percent of wastewater is considered residential?
If you believe this information has already been sent in as part of
CMU's renewal for Mallard and McDowell, please contact me.
Thanks,
Julie
Julie Grzyb
Environmental Engineer
NPDES West/ DWQ
N.C. Dept. of Environment and Natural Resources
1617 Mail Service Center, Raleigh, NC 27699-1617
[phone]; fax [phone]
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.
Content -Description: Residuals Mgmt letter.doc
Residuals Mgmt letter.docContent-Type: application/msword
Content -Encoding: base64
1 of 1 3/20/2009 9:54 AM

permit renewal, Mallard and McDowell
Subject: permit renewal, Mallard and McDowell
From: Julie Grzyb <[e-mail]>
Date: Wed, 18 Mar 2009 15:53:12 -0400
To: "Padgett, Dawn" <[e-mail]>
Dawn,
Thanks to you and all the CMU staff who came out and helped explain and answer
questions on Mallard and McDowell Creek WWTP's. I can see why you all are so proud to
show the plants off. Again, thanks for all your time and effort showing me around.
I am trying to finish up both draft permits and have a few items requiring your help.
Mallard Creek - the correspondence file in the Central office contains no copy of the
letter CMU wrote in response to the NOV issued 3-7-08. If you can email that to me
(or send it) I will try to incorporate your response into the fact sheet if
appropriate. The NOV is for a discharge of wastewater without adequate disinfection
and not a failed operating procedure so. IlL think your letter may be appropriate.
G,. reef r�.,d e,1c4t- A;;lc / igVl
McDowell Creek,- The permit renewal applicationgives_process design _removal rates
in Attachment #3 A.11.b. Can you give me actual removal rates for these parameters
over the past two years (1/07 - 12/08)? Primarily interested in TN and TP but if you
have the others it would be helpful.
Please call if�you want to discuss, a -
k
Julie �' ��^ O .-
Julie Grzyb
Environmental Engineer
NPDES West/ DWQ
N.C. Dept. of Environment and Natural Resources
1617 Mail Service Center, Raleigh, NC 27699-1617
[phone];.�fax [phone]
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 of 1 3/18/2009 5:48 PM

•
CHAHIATTE-
i! JUN 2 6 2008 LI!
June 24, 2008
NCDENR/DWQ ----
Attn: NPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
RE: NPDES Permit Application for McDowell Creek W WTP
NPDES Permit #NC0036277
Dear Point Source Unit:
Please find enclosed the original and two copies of the NPDES Permit Application for
McDowell Creek W WTP, NPDES Permit #NC0036277. This application is for the
renewal of the current NPDES Permit that expires on December 31, 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 B.2.
Attachment #2 is the process flow diagram required by Section B.3. Attachment #3
completes the treatment description required in Section A.I La. and includes a summary
of the attachment required in Section B.3. Attachment #4 includes copies of ail of the
toxicity results (both daphnia and fat head minnow) for the past 4 % 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 Pete Goins at 704/875-6443.
Thank you for your assistance,
acquene A Jarrell, P.E.
uperintendent
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]

K
I
Streets
Wells / Drinking Water
— Streams
= ForceMain
Gravity
LowPressure
Sludge
QMcDowellParcel
.t
Neck Rd
a'J
One Mile Radius Around
McDowell Creek WWTP
WAitlNq p-bSOIiA PAIL RAAAiyj
JJ 0 0.125 0.25 0.5 0.75 1
Miles
2
OSMf GN
C.amNoOaVm rm"W

Ar
Charlotte -Mecklenburg Utilities
McDowell Creek WWTP
NPDES # NC0036277
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; odor control in the headworks; five primary clarifiers; two trains
in parallel of activated sludge treatment utilizing three stage biological
nutrient removal and two trains of activated sludge treatment utilizing five
stage biological nutrient removal; four final clarifiers; effluent denitrifying
filters; membrane filtration and reuse distribution; ultraviolet disinfection;
sludge thickening; anaerobic digesters; and sludge dewatering.
A.1 Lb Design Removal Rates
Process Design Percentages of
Removal
Parameter
12.0 mgd
Winter
12.0 mgd
Summer
CBOD (%)
97
98
SS (%)
97
97
P (%)
95
96
N (%)
87
88
B.3. Process Flow Diagram or Schematic
McDowell Creek WWTP is currently designed to treat 12.0 million gallons per day
(mgd) of wastewater. The attached schematics (SC-1, -2, -3) show the process flow
through the facility. A full summary of the process flow is included on the following
page.

Charlotte -Mecklenburg Utilities
McDowell Creek WWTP
NPDES # NCO036277
Process Flow Schematics
12-mgd treatment description
Preliminary treatment:
Wastewater enters the plant through a 36-inch gravity sewer line and splits between
two manholes. Flow then enters the headworks and influent pumping station through two
48-inch gravity sewer lines. Flow entering the head works separates into three screening
channels each sized for 30.0 mgd capacity and passes through mechanical bar screens.
Screenings are compacted and conveyed to a dumpster loading area common with the grit
dumpsters.
Primary treatment:
Following preliminary treatment, the wastewater splits between distribution boxes
(DB), DB-1 and DB-16 and is distributed to the five primary clarifiers (PC-1 through PC-
5). After primary treatment in the clarifiers, a part of the wastewater from PC-1 and PC-2
is directed through DB-4. It continues through DB-4a to combine with wastewater from
PC-3, 4 and 5 in DB-4a and further to DB-5 where it is combined with' Return Activated
Sludge (RAS).
Secondary treatment:
The combined flow from PC-1, 2 and 3 through DB-10 is split equally between
biological treatment trains 1 and 2 where it goes through an anaerobic zone, anoxic/oxic
zone and aeration zone with internal recycle. Flow from PC-4 and PC-5 go through a rate
control structure before entering the newly constructed 5-stage BNR basins (BTB-3 and
4) designed for nitrogen and phosphors removal.
Following the aeration basin, flow from anoxic/oxic basins 1 and 2 is combined in
DB-9 and split to final clarifiers (FC) FC-1 and FC-2. Flow from BTB-3 is sent to FC-3
and from BTB-4 is sent to FC-4.
Tertiary treatment:
Combined secondary effluent from all the final clarifiers is sent to effluent filter
structure (EF) EF-1 and EF-2 for filtration and UV disinfection or 3.0 mgd is sent to
microfiltration units. Filtered effluent from the microfiltration system and the effluent
filter structures will be combined and sent to the cascade aeration structure where
aeration takes place. The cascade aeration structure will discharge through a 48" line into
McDowell Creek.

-----------------------------------
( ,�JJHH++..,,II -------ZONE S_-(r---------------ZONE-r------�E-`_-----`+------7--'-T--r-------------�------------------�-�-------- -
r1• 1 (3.D.6.0)-4 (-----Tr, ',,ti_S_6 ' ZONE 5-9 ;-�- Lj'�' �_ I `RFD
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BASIN AND
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RATE CONTROL
STRUCTURE NO,
v19
f Lend
6.6 MGD RE -FATED FACILITY (1)
9.0 MGD EXPANSION (2)
-- 12.0 MGD EXPANSION (3)
--------- FUTURE 15.0 MGD EXPANSION (4)
(9.0,18.0)-2 —LEGEND REFERENCE NO.
\PEAK DAY FLOW (MGD)
w
AVG DAY FLOW MGD)
PLRNTjDRRIN
�— TD
RFD
RFD
(1.5,3.0)-2/3/4
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( RFO
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DESIGNED:
PROJECT NO.
97057
SC-2
SHEET
2 OF 3
97057-330-WWTUP-PR-HOOODDISV 12/01/2000 15:22:09 AGO. PIOLLed : 211101 6:42:56 PM

INFLUENT PUMPING STATION
(NOTE 1)
DRY WELL
I I
- j- I j-
(6.6,13.2)-1
(9.0,18.0)-2
GRIT A SCREENINGS
1
OUMPSTER
BELT AIR FROM
CONVEYOR BLOWERS
BC-2 �ti i
EllEWS GRIT BASIN
BELT d
CONVEYDR -
BC-2 ,
41L
TO
PRIMARY
SCUM
PIPELINE
WET WELL
✓P T
36"
(6.6,13.2)-1�
BYPASS
(66,78.0)-2 .
901
'
I
/ EXISTING I
I
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-
1-1/2" BAR I
SCREENMECHANICAL
I
,
T
BAR SCREEN
BS-1
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—
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TO
S PRIMARY
I
1
,
--- �BOX
PCUM
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I
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,
I
I
L__-_--
(0.0,0.0)-2 24" OVERFLOW
PRELIMINARY
TREATMENT
EXISTING
FLU - -
PRRSHALL FLUME INSERT
I
I
,
1
(NOTE 11
I I
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L------------------------
--------------- ----------------------
HEADWORKS
30" FM
(12.0,247 3 ,
o5.0.30.0)-4 '
(12.0,24.0)-3
r---------- Q5.0,30.0)_4
(NOTE 11
,
I OWG
NOTES:
1. EXISTING HEADWORKS. INFLUENT PUMPING STATION.
I
1T♦ -�
r - - - - - - - - - - - - - - - - - - - - - - - - - - - - I
I - - - - , SC-2
I- - TO FUTURE
- TOE TRERTMENT
F
INFLUINFLUENT AND PRELIMINARY TREATMENT STRUCTURE TO BE
ENT
11 ABANDONED AFTER NEW HEADWORKS FINE) INFLUENT
PUMPING STATION IS IN SERVICE DURING 12 MGD
EXPANSION.
I ,
_____________- - - - - - - I _
-p'i!
I i TRAINS
I
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L_�l-m''F� j 1 i
FIRST
STAGE I I
I
j}qI L-------------------------------11LL-------------------------------
PUMPS I I
I
I
Legend
1� 5 i
1[
DESIGNED:
DETAILED:
CHECKED:
APPROVED:
DATE:
PROJECT NO.
�V�4�+1
SECOND STAGE 6.6 MGD RE -RATED FACILITY (1) I 97057
I
I I I PUMPS I 9.0 MGD EXPANSION (2)
I I
L - - - - - - - - - - - - - - - - - - _______________-_-_____________________J ----_ 12.0 MGD EXPANSION (3)
HEADWORKS AND INFLUENT PUMPING STATION
--------- FUTURE 15.0 MGD EXPANSION (4)
(9.0,18.C)-2fLECEND REFERENCE NO.
PEAK DAY FLOW (MGD)
AVG DAY FLOW (MGD)
SC-1
SHEET
Y OF 3