NC0036277_Permit Issuance_19951002

NPDES DOCYNEMT SCANNING COVER SHEET
NPDES Permit:
NCO036277
McDowell Creek WWTP
Permit Issuance
Document Type:
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:
October 2, 1995

;itc e of North Carolina
Department of Environment,
Health and Natural Resources
Division of Environmental Management
J,imes B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary
A. Preston Howard, Jr., P.E., Director
October 2, 1995
Mr. Douglas O. Bean, Director
Charlotte -Mecklenburg Utility Department
5100 Brookshire Boulevard
Charloote, North Carolina 28216
Dear Mr. Bean:
E)EHNF1
Subject: Permit Issuance
NPDES Permit NCO036277
McDowell Creek WWTP
Mecklenburg County
In accordance with your application for discharge permit received on March 14, 1995, we are
forwarding herewith the subject State - NPDES permit. This permit is issued pursuant to the
requirements of North Carolina General Statute 143-215.1 and the Memorandum of Agreement
between North Carolina and the US Environmental Protection Agency dated December 6, 1983.
In response to Black & Veatch's letter of August 11, 1995, the following modifications and
responses are offered:
• Permit effective date: The effective date will be November 1, 1995 based on the revised issue
date of October 2, 1995.
• Permit cover supplement sheet - The option to obtain authorization to operate a 3.5 MGD plant
has been listed.
• Monitoring requirements for fluoride and chloride - Since these two parameters are consistently
present in the discharge, and since the predicted maximum value exceeds 10% of the allowable
effluent concentration, monitoring is required. The monitoring frequency was reduced from
weekly to quarterly due to the lower concentrations detected. Monitoring data will be reevaluated
during the next permit renewal.
• Definition of "daily"- This is defined in NCAC 15A 2B .0503(5) as every day on which a
discharge occurs excluding weekends and legal holidays.
• Conductivity sampling frequency - Daily monitoring is specified per NCAC 15A 2B .0508(d)
for class IV treatment facilities.
• Removal of total residual chlorine limit/monitoring requirement - A footnote has been added
stating that the limit and monitoring are not applicable if the effluent is chlorinated. The limit must
remain since it is applied to all facilities Statewide upon expansion.
• Point when limits become effective - Division policy requires limits for expanded flows (3.5
MGD and 6.0 MGD in this case) to take effect once an authorization to construct (or operate) is
given and modifications are complete.
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/ 10% post -consumer paper

i
• Reporting Requirement in Part II, Section E.6.b. (3) - This section is interpreted to mean 24
hours from the time the permittee is aware of the violation.
• Public notice requirement - Part III, Condition J changes the two months specified in Part III,
Condition B.11. to six months as requested.
• Chronic Toxicity Testing - Part III, Conditions G, H and I have been changed to the Phase II
test as requested.
If any parts, measurement frequencies or sampling requirements contained in this permit are
unacceptable to you, you have the right to an adjudicative 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, Post Office Drawer 27447, Raleigh, North Carolina 27611-7447. Unless
such demand is made, this decision shall be final and binding.
Please take notice this permit is not transferable. Part II, EA. addresses the requirements to be
followed in case of change in ownership or control of this discharge.
This permit does not affect the legal requirements to obtain other permits which may be required by
the Division of Environmental Management or permits required by the Division of Land Resources,
Coastal Area Management Act or any other Federal or Local governmental permit that may be
required.
If you have any questions concerning this permit, please contact Mr. Greg Nizich at telephone
number 919/733-5083, ext. 541.
Sincerely,
Original Signed By
David A. Goodrich
A. Preston Howard, Jr., P.E.
cc: Central Files
Mr. Roosevelt Childress, EPA
Mooresville Regional Office, Water Quality Section
Mecklenburg County
Facility Assessment Unit
Aquatic Survey & Toxicology Unit
Technical Assistance & Certification Group
Permits and Engineering Unit

i
Permit No. NCO036277
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT, HEALTH, AND NATURAL RESOURCES
DIVISION OF ENVIRONMENTAL MANAGEMENT
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,
Charlotte Mecklenburg Utility Department
is hereby authorized to discharge wastewater from a facility located at
McDowell Creek Wastewater Treatment Plant
NCSR 2074
near the Town of 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, H, and III hereof.
This permit shall become effective November 1, 1995
This permit and authorization to discharge shall expire at midnight on September 30, 2000
Signed this day October 2, 1995
Original Signed By
David A. Goodrich
A. Preston Howard, Jr., P.E., Director
Division of Environmental Management
By Authority of the Environmental Management Commission

Permit No. NCO036277
SUPPLEMENT T4 PERMIT COVER SHEET
City of Charlotte/Charlotte-Mecklenburg Utility Department
is hereby authorized to:
1. Continue to operate the existing 10 MGD wastewater treatment facility
consisting of manual bar screens, grit removal, influent pumping, primary
clarifiers, trickling filters, first stage aeration, intermediate clarifiers, second
stage aeration, final clarifiers, aerated polishing pond and chlorination located at
the McDowell Creek Wastewater Treatment facility, on SR 2074, Neck Road
near the Town of Huntersville, Mecklenburg County (See Part III of this
Permit), and
Lon
2. After receiving an Authorization perate from the Division of
Environmental Management increase ater flow from the existing plant to
3.5 MGD, and
3. After receiving an Authorization to Construct from the Division of
Environmental Management construct and operate a 6.0 MGD treatment
• facility, and
4 C;3)Discharge from said treatment works at the location specified on the attached
map into McDowell Creek, classified as WS-IV waters in the Catawba River
Basin.

tf
I ' ram\`.%�yy�• 1 S 8or , I'/��// ii 1 •�- _ /. , �'r��0 /� s(�1t r
i-sj• .. r am• \ ` - L `•�. ��� `�j�; i`\ \ it i %1�, i'i •'�^ `� r` •���V.z
It
00
7 % r •` ter• � �
' ✓��� • 'I� �� �' ii / - -' '. - � ` (��_`- ��' / fir' •� �'.��/� /. �. 0-f,/ I r
If
` ter' ; �,�= I 1 \ �� . //Q • r ,.,! :. ` / / 7`56
` _ _ .,- � 1 \ ,,,�• /l,�;j .�� „tom. �C \l� 1 � I}�\• � /. � �'� ,' � � It
\ \0`1
•VJI / vim,/,- � _• `• • .. L ``� r �.1 VVi J�:+// iifJ '��� 7� � �/ ; // / //i , � � / � •� 7 ,� :� � 1-
sc
_L11qCOLht .-'� ��-^`' - - —75
so
j %, ,J �� //�/J� � Cam," -/ .`� '.•r-_..--�`�-' �,• ,� • '/ -' � �1, '� • ^,`�` `
er
' �/• •r^��.v / ' � � Ili.
� _ _ ~�/ I .��' � \ - _ _ » •",• ,,.fir �� � '.
cam.
bt-
?Allison Fn•c� - 167,9
�' ��;� L`- •.. - _ /
69
It
30. 40Rural-Hill-"
i. /,/�i✓ ^\ �,1\v:..�� "I.% r' V ` k�'/J��� tv i
�\' .�� • / / ( ,i t
•�t;\;`; - � „! ��I��� i/ i. \I 5='`'� ,� ��� •`{i f1 ,v,��",. ; ' J111 r /� / • ::• tl �� all �
SGyS `�� i�/r".%✓� 1 %% f /% .� C� 1. i �l '� , / / 745 76
X
-�7 `.a \�' .� C ��. I I SL ��% • / f / ve
�, gip. _�_•, v .off;' \�� . i i ` 1af• , ✓/ i'00 �� .-• ,f , �ho�/ ~� I
2
/c' a T.rt+•p f If f ; �,; �� _• r' // ` , '�
5M 57'30r' SO4 I 505 (PAW CREEK) 506 507 Ij 55:
4851, IV sw
SCALE 1:24 000
* 1 0 1 MILE
µN
iGN 1000 0 1000 20DC 30X dODcl SOOG 600: 700; FEE
ti 1 g 0 KILOMETEP
53 MILS I ° • 0.02'
.d. IW.IL CONTOUR INTERVAL 10 FEFT
DATUM IS MEAN SEA LEVEL
1'
GRID ANC 2970 MAGNET;C n�rRT,-
:LINATION AT CENTEF 0- S►•E---
TH! MAP .^ON��I_$ W!-H NATIONAL N,A= ADD,:PAC� S7pND,=__
=,OR SALE BY L..'. S. GFOLn ,Vf A' c' Ih�.'—.' ,,• ..:>:,�.__� ,• � _

A. (). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS SUMMER (April 1 - October 31) Permit No. NCO036277
During the period beginning on the effective date of the permit and lasting until EXPANSION ABOVE 3.0 MGD or expiration, the Permittee is
authorized to discharge from outfall(s) serial number 001. Such discharges shall be limited and monitored by the permittee as specified below:
Effluent Characteristic.
Flow
BOD, 5 day, 200C**
Total Suspended Residue**
NH3 as N
Dissolved Oxygen ***
Fecal Coliform (geometric mean)
Total Residual Chlorine
Temperature
Total Nitrogen (NO2 + NO3 + TKN)
Total Phosphorus
Chronic Toxicity""
Discharge
Limitation. -
Monthly Avg
Weekly Avg.
3.0 MGD
5.0 mg/I
7.5 mg/l
30.0 mg/I
45.0 mg/l
2.0 mg/I
200.0 /100 ml 400.0 /100 ml
Monitoring
Requirement-c
*Sample.
Measurement
Daily Max Frea.uencv
SamI21e
Tyne
Location
Continuous
Recording
I or E
Daily
Composite
E, I
Daily
Composite
E, I
Daily
Composite
E
Daily
Grab
E, U, D
Daily
Grab
E, U, D
Daily
Grab
E
Daily
Grab
E,U,D
Monthly
Composite
E
Monthly
Composite
E
Quarterly
Composite
E
* Sample locations: E - Effluent, I - Influent, U - Upstream at Beatties Ford Road, D - Downstream at Neck Road
Upstream and downstream samples shall be grab samples. Stream samples shall be collected three times per week during June, July, August,
and September and once per week during the remaining months of the year.
** The monthly average effluent BOD5 and Total Suspended Residue concentrations shall not exceed 15 % of the respective influent value
(85% removal).
*** The daily average dissolved oxygen effluent concentration shall not be less than 5.0 mg/l.
**** Chronic Toxicity, Phase II at 72%;January, April, July, October; See Part III, Condition G.
The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units and shall be monitored daily at the effluent by grab sample.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

o
A. (). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS SUMMER (April 1 - October 31) Permit No. NCO036277
During the period beginning on the effective date of the permit and lasting until EXPANSION ABOVE 3.0 MGD or expiration, the Permittee is -
authorized to discharge from outfall(s) serial number 001. (Continued)
Effluent Characteristic.
Discharge Limitation: Monitoring
Reauirementes
Units (specifx Measurement
Sample
*Samg_le
Monthly Avg Weekly Avg. Daily Ma Frea.uencv
Tvae
Location
Conductivity
Daily
Grab
E,U,D
Cadmium
2.8 µ g / I Weekly
Composite
E
Cyanide
6.9 µ g / I Weekly
Grab
E
Lead
35.0 µ g / I Weekly
Composite
E
Mercury
2/Month
Composite
E
Copper
2/Month
Composite
E
Zinc
2/Month
Composite
E
Chloride
Quarterly
Composite
E
Fluoride
Quarterly
Composite
E

A. (). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS WINTER (November 1 - March 31) Permit No. NCO036277
During the period beginning on the effective date of the permit and lasting until EXPANSION ABOVE 3.0 MGD or expiration, the Permittee is
authorized to discharge from outfall(s) serial number 001. Such discharges shall be limited and monitored by the permittee as specified below:
Effluent Characteristic.
Flow
BOD, 5 day, 20°C**
Total Suspended Residue"
NH3 as N
Dissolved Oxygen ***
Fecal Coliform (geometric mean)
Total Residual Chlorine
Temperature
Total Nitrogen (NO2 + NO3 + TKN)
Total Phosphorus
Chronic Toxicity****
Discharge
Limitation:
Monthly Avg
Weekly Avg.
3.0 MGD
11.0 mg/I
16.5 mg/I
30.0 mg/I
45.0 mg/I
2.0 mg/I
200.0 /100 ml 400.0 /100 ml
Monitoring
Reauurement-c
*Sample
Measurement
Daily Max Frea,uencv
Samg_le
TYRE
Location
Continuous
Recording
I or E
Daily
Composite
E, I
Daily
Composite
E, I
Daily
Composite
E
Daily
Grab
E, U, D
Daily
Grab
E, U, D
Daily
Grab
E
Daily
Grab
E,U,D
Monthly
Composite
E
Monthly
Composite
E
Quarterly
Composite
E
* Sample locations: E - Effluent,'I - Influent, U - Upstream at Beatties Ford Road, D - Downstream at Neck Road
Upstream and downstream samples shall be grab samples. Stream samples shall be collected three times per week during June, July, August,
and September and once per week during the remaining months of the year.
** The monthly average effluent BOD5 and Total Suspended Residue concentrations shall not exceed 15 % of the respective influent value
(85% removal).
*** The daily average dissolved oxygen effluent concentration shall not be less than 5.0 mg/l.
**** Chronic Toxicity, Phase II at 72%;January, April, July, October; See Part III, Condition G.
The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units and shall be monitored daily at the effluent by grab sample.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

A. (). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS WINTER (November 1 - March 31) Permit No. NCO036277
During the period beginning on the effective date of the permit and lasting until EXPANSION ABOVE 3.0 MGD or expiration, the Permittee is
authorized to discharge from outfall(s) serial number 001. (Continued)
Effluent Characteristic.
Conductivity
Cadmium
Cyanide
Lead
Mercury
Copper
Zinc
Chloride
Fluoride
Discharge Limitation. -
Units (specify
Monthly Avg Weekly Avg.
Monitoring
Requirementse
Measurement
Sample
*Sample
Dail Max
re uencv
TXpe
Location
Daily
Grab
E,U,D
2.8 µ g / I
Weekly
Composite
E
6.9 µ g / I
Weekly
Grab
E
35.0 µg/I
Weekly
Composite
E
2/Month
Composite
E
2/Month
Composite
E
2/Month
Composite
E
Quarterly
Composite
E
Quarterly
Composite
E

A. (). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS Summer (April 1- October 31) Permit No. NCO036277
During the period beginning upon EXPANSION ABOVE 3.0 MGD and lasting until EXPANSION ABOVE 3.5 MGD or expiration, the
Permittee is authorized to discharge from outfall(s) serial number 001. Such discharges shall be limited and monitored by the permittee as
specified below:
Effluent Characteristics
Flow
BOD, 5-Day, 200C**
Total Suspended Residue**
NH3 as N
Dissolved Oxygen***
Fecal Coliform (geometric mean)
Total Residual Chlorine
Temperature
Total Nitrogen (NO2 + NO3 + TKN)
Total Phosphorus
Conductivity
Chronic Toxicity****
Discharge Limitations
Monthly. Avg. Weekly Avg. Daily Max.
3.5 MGD
5.0 mg/I 7.5 mg/I
30.0 mg/I 45.0 mg/I
2.0 mg/l
200 /100 ml 4001100 ml
Monitoring
- Requirements
Measurement
Sample
*Sample
Frequency
Type
Location
Continuous
Recording
I or E
Daily
Composite
1,E
Daily
Composite
1,E
Daily
Composite
E
Daily
Grab
E,U,D
Daily
Grab
E,U,D
Daily
Grab
E
Daily
Grab
E,U,D
Monthly
Composite
E
Monthly
Composite
E
Daily
Grab
E,U,D
Quarterly
Composite
E
* Sample locations: E - Effluent, I - Influent, U - Upstream at Beatties Ford Road; D - Downstream at Neck Road. Upstream and downstream
samples shall be grab samples. Stream samples shall be taken three times per week during the months of June, July, August and September, and
once per week during the remaining months of the year.
** The monthly average effluent BOD5 and Total Suspended Residue concentration. shall not exceed 15% of the respective influent value (85 %
removal).
*** The daily average dissolved oxygen effluent concentration shall not be less than 5.0 mg/l.
**** Chronic Toxicity, Phase II at 76%; January, April, July and October; See Part III Condition H.
The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units and shall be monitored daily by grab sample at the effluent.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

A. (). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS Summer (April 1- October 31) Permit No. NCO036277
During the period beginning upon EXPANSION ABOVE 3.0 MGD and lasting until EXPANSION ABOVE 3.5 MGD or expiration, the
Permittee is authorized to discharge from outfall(s) serial number 001.
(Continued)
Effluent Characteristics Discharge Limitations
Monitoring
Reguirements
Measurement
Sample
*Sample
Monthly. Avg. Weekly
Avg. Daily Max.
Freauencv
Type
Location
Cadmium
2.6 µ g / I
Weekly
Composite
E
Lead
33.0 µ g / I
Weekly
Composite
E
Cyanide
6.6 µ g / I
Weekly
Grab
E
Mercury
2/Month
Composite
E
Copper
2/Month
Composite
E
Zinc
2/Month
Composite
E
Chloride
Quarterly
Composite
E
Fluoride
Quarterly
Composite
E

A. (). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS Winter (November 1- March 31) Permit No. NC0036277
During the period beginning upon EXPANSION ABOVE 3.0 MGD and lasting until EXPANSION ABOVE 3.5 MGD or expiration, the
Permittee is authorized to discharge from outfall(s) serial number 001. Such discharges shall be limited and monitored by the permittee as
specified below:
Effluent Characteristics
Flow
BOD, 5-Day, 2010C**
Total Suspended Residue"
NH3 as N
Dissolved Oxygen***
Fecal Coliform (geometric mean)
Total Residual Chlorine
Temperature
Total Nitrogen (NO2 + NO3 + TKN)
Total Phosphorus
Conductivity
Chronic Toxicity****
Discharge Limitations
Monthly, Avg. Weekly Avg. Daily Max.
3.5 MGD
11.0 mg/l 15.5 mg/l
30.0 mg/l 45.0 mg/l
2.0 mg/l
200 /100 ml 400 /100 ml
Monitoring
Requirements
Measurement
Sample
*Sample
Frequency
Continuous
Iv, ae
Recording
Location
I or E
Daily
Composite
1,E
Daily
Composite
I,E
Daily
Composite
E
Daily
Grab
E,U,D
Daily
Grab
E,U,D
Daily
Grab
E
Daily
Grab
E,U,D
Monthly
Composite
E
Monthly
Composite
E
Daily
Grab
E,U,D
Quarterly
Composite
E
* Sample locations: E - Effluent, I - Influent, U - Upstream at Beatties Ford Road; D - Downstream at Neck Road. Upstream and downstream
samples shall be grab samples. Stream samples shall be taken three times per week during the months of June, July, August and September,
and once per week during the remaining months of the year.
** The monthly average effluent BOD5 and Total Suspended Residue concentration shall not exceed 15% of the respective influent value (85 %
removal).
*** The daily average dissolved oxygen effluent concentration shall not be less than 5.0 mg/l.
**** Chronic Toxicity, Phase II at 76%; January, April, July and October; See Part III Condition H.
The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units and shall be monitored daily by grab sample at the effluent.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

A. (). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS Winter (November 1- March 31) Permit No. NCO036277
During the period beginning upon EXPANSION ABOVE 3.0 MGD and lasting until EXPANSION ABOVE 3.5 MGD or expiration, the
Permittee is authorized to discharge from outfall(s) serial number 001. (Continued)
Effluent Characteristics Discharge Limitations Monitoring Requirements
Measurement Sample *Sam1le
Monthly. Avg. Weekly Avg. Daily Max. Frequency Type Location
Cadmium
Lead
Cyanide
Mercury
Copper
Zinc
Chloride
Fluoride
2.6 µ g / 1 Weekly
Composite
E
33.0 µ g / I Weekly
Composite
E
6.6 µ g / 1 Weekly
Grab
E
2/Month
Composite
E
2/Month
Composite
E
2/Month
Composite
E
Quarterly
Composite
E
Quarterly
Composite
E

A. (). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS Summer (April 1- October 31) Permit No. NCO036277
During the period beginning upon EXPANSION ABOVE 3.5 MGD and lasting until expiration, the Permittee is authorized to discharge
from outfall(s) serial number 001. Such discharges shall be limited and monitored by the permittee as specified below:
Effluent Characteristics
Flow
BOD, 5-Day, 20°C**
Total Suspended Residue"
NH3 as N
Dissolved Oxygen***
Fecal Coliform (geometric mean)
Total Residual Chlorine
Temperature
Conductivity
Total Nitrogen (NO2 + NO3 + TKN)
Total Phosphorus
Chronic Toxicity****
Discharge Limitations
Monthly, Avg. Weekly Avg. Daily Max.
6.0 MGD
5.0 mg/I 7.5 mg/l
30.0 mg/l 45.0 mg/l
2.0 mg/I
200 /100 ml 400 /100 ml
10.0 mg/I
1.0 mg/I
22.0 µg/l+
Monitoring
Requirements
Measurement
Sample
*Sample
Frequency
Type
Location
Continuous
Recording
I or E
Daily
Composite
I, E
Daily
Composite
I, E
Daily
Composite
E
Daily
Grab
E,U,D
Daily
Grab
E,U,D
Daily
Grab
E
Daily
Grab
E,U,D
Daily
Grab
E,U,D
Weekly
Composite
E
Weekly
Composite
E
Quarterly
Composite
E
* Sample locations: E - Effluent, I - Influent, U - Upstream at Beatties Ford Road; D - Downstream at Neck Road. Upstream and downstream
samples shall be grab samples. Stream samples shall be taken three times per week during the months of June, July, August and September,
and once per week during the remaining months of the year.
** The monthly average effluent BOD5 and Total Suspended Residue concentrations shall not exceed 15% of the respective influent value (85 %
removal).
*** The daily average dissolved oxygen effluent concentration shall not be less than 5.0 mg/l.
**** Chronic Toxicity, Phase II at 85%; January, April, July and October; See Part III Condition I.
+ Limit and monitoring apply only if the effluent is chlorinated.
The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units and shall be monitored daily by grab sample at the effluent.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

A. (). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS Summer (April 1 - October 31) Permit No. NCO036277
During the period beginning upon EXPANSION ABOVE 3.5 MGD and lasting until expiration, the Permittee is authorized to discharge
from outfall(s) serial number 001. (Continued)
Effluent Characteristics Discharge
Limitations Monitoring
Requirements
Measurement
Sample.
*Sample
Monthly,
v_g. Weekly Avg. Daily Max. Frequency
Type
Location
Cadmium
2.4 µ g / I Weekly
Composite
E
Lead
30.0 µ g / I Weekly
Composite
E
Cyanide
5.9 µ g / I Weekly
Grab
E
Mercury
2/Month
Composite
E
Copper
2/Month
Composite
E
Zinc
2/Month
Composite
E
Chloride
Quarterly
Composite
E
Fluoride
Quarterly
Composite
E

A. (). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS Winter (November 1- March 31) Permit No. NCO036277
During the period beginning upon EXPANSION ABOVE 3.5 MGD and lasting until expiration, the Permittee is authorized to discharge
from outfall(s) serial number 001. Such discharges shall be limited and monitored by the permittee as specified below:
Effluent Characteristics
Flow
BOD, 5-Day, 20°C**
Total Suspended Residue**
NH3 asN
Dissolved Oxygen***
Fecal Coliform (geometric mean)
Total Residual Chlorine
Temperature
Conductivity
Total Nitrogen (NO2 + NO3 + TKN)
Total Phosphorus
Chronic Toxicity****
Discharge Limitations
Monthly, Ava. Weekly Avg. Daily Max.
6.0 MGD
10.0 mg/I 15.0 mg/l
30.0 mg/l 45.0 mg/l
2.5 mg/l
200 /100 ml
10.0 mg/I
1.0 mg/I
400 /100 ml
22.0 µg/l+
Monitoring
Requirements
Measurement
Sample
*Sample
Frequents
Type
Location
Continuous
Recording
I or E
Daily
Composite
I,E
Daily
Composite
I,E
Daily
Composite
E
Daily
Grab
E,U,D
Daily
Grab
E,U,D
Daily
Grab
E
Daily
Grab
E,U,D
*
Grab
E,U,D
Weekly
Composite
E
Weekly
Composite
E
Quarterly
Composite
E
* Sample locations: E - Effluent, I - Influent, U - Upstream at Beatties Ford Road; D - Downstream at Neck Road. Upstream and downstream
samples shall be grab samples. Stream samples shall be taken three times per week during the months of June, July, August and September,
and once per week during the remaining months of the year.
** The monthly average effluent BOD5 and Total Suspended Residue concentrations shall not exceed 15% of the respective influent value (85 %
removal).
*** The daily average dissolved oxygen effluent concentration shall not be less than 5.0 mg/l.
**** Chronic Toxicity, Phase II at 85%; January, April, July and October; See Part III Condition I.
+ Limit and monitoring apply only if the effluent is chlorinated.
The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units and shall be monitored daily by grab sample at the effluent.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

A. (). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS Winter (November 1- March 31) Permit No. NCO036277
During the period beginning upon EXPANSION ABOVE 3.5 MGD and lasting until expiration, the Permittee is authorized to discharge
from outfall(s) serial number 001. (Continued)
Effluent Characteristics Discharge
Limitations
Monitoring
Requirements
Measurement
Sample
*Sample
Monthly..
Avg. Weekly Avg. Daily Max.
Frequency
Tyne
Location
Cadmium
2.4 µ g / I
Weekly
Composite
E
Lead
30.0 µ g / I
Weekly
Composite
E
Cyanide
5.9 µ g / I
Weekly
Grab
E
Mercury
2/Month
Composite
E
Copper
2/Month
Composite
E
Zinc
2/Month
Composite
E
Chloride
Quarterly
Composite
E
Fluoride
Quarterly
Composite
E

Part III
Permit No. NCO036277
G. CHRONIC TOXICITY PERMIT LIMIT (QRTRLY)
IN
The effluent discharge shall at no time exhibit 48 hour acute toxicity as lethality in an effluent
concentration of 72.0% nor measure a quarterly arithmetic average chronic value less than this
same percentage of waste. The chronic value will be determined using the geometric mean of the
highest concentration having no statistically detectable impairment of reproduction or survival and
the lowest concentration that does have a statistically detectable impairment of reproduction or
survival. The presence of 48 hour acute toxicity will be determined using Fisher's Exact Test at 48
hours from test initiation. Collection methods, exposure regimes, and further statistical methods
are defined in: The North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure
(July, 1991) or subsequent versions.
The permit holder shall perform at a minimum, quarterly monitoring using these procedures to
establish compliance with the permit condition. The first test will be performed within thirty days
from the effective date of this permit during the months of January, April, July 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 first test of any single quarter measures 48 hour acute
toxicity or a chronic value less than that specified above, then multiple concentration testing shall
be performed, at a minimum, in each of the two following months.
All toxicity testing results required as part of this permit condition will be entered on the Effluent
Discharge Monitoring Form (MR-1) for the months in which tests were performed, using the
parameter code THP3B for the Chronic Value and TGA3B for the 48 hour Acute Toxicity measure
(Pass/Fail). Additionally, DEM Form AT-3 (original) is to be sent to the following address:
Attention:
Environmental Sciences Branch
North Carolina Division of
Environmental Management
4401 Reedy Creek Road
Raleigh, NC 27607
Test data shall be complete and accurate and include all supporting chemical/physical measurements
performed in association with the toxicity tests, as well as all dose/response data. Total residual
chlorine of the effluent toxicity sample must be measured and reported if chlorine is employed for
disinfection of the waste stream.
Should any test data from this monitoring requirement or tests performed by the North Carolina
Division of Environmental Management indicate potential impacts to the receiving stream, this
permit may be re -opened and modified to include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum
control organism survival and appropriate environmental controls, shall constitute an invalid test
and will require immediate retesting (within 30 days of initial monitoring event). Failure to submit
suitable test results will constitute noncompliance with monitoring requirements.
.,,H.,CIW?4 C-T-O-YCITY--PER -ITLIMIT--(QRTRLY)
The effluent discharge shall at no time exhibit 48 hour acute toxicity as lethality in an effluent
concentration of 76.0% nor measure a quarterly arithmetic average chronic value less than this
same percentage of waste. The chronic value will be determined using the geometric mean of the
highest concentration having no statistically detectable impairment of reproduction or survival and
the lowest concentration that does have a statistically detectable impairment of reproduction or
survival. The presence of 48 hour acute toxicity will be determined using Fisher's Exact Test at 48

I
hours fiom test initiation. Collection methods, exposure regimes, and further statistical methods
are defined in: The North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure
(July, 1991) or subsequent versions.
The permit holder shall perform at a minimum, quarterly monitoring using these procedures to
establish compliance with the permit condition. The first test will be performed within thirty days
from the effective date of this permit during the months of January, April, July 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 first test of any single quarter measures 48 hour acute
toxicity or a chronic value less than that specified above, then multiple concentration testing shall
be performed, at a minimum, in each of the two following months.
All toxicity testing results required as part of this permit condition will be entered on the Effluent
Discharge Monitoring Form (MR-1) for the months in which tests were performed, using the
parameter code THP3B for the Chronic Value and TGA3B for the 48 hour Acute Toxicity measure
(Pass/Fail). Additionally, DEM Form AT-3 (original) is to be sent to the following address:
Attention:
Environmental Sciences Branch
North Carolina Division of
Environmental Management
4401 Reedy Creek Road
Raleigh, NC 27607
Test data shall be complete and accurate and include all supporting chemical/physical measurements
performed in association with the toxicity tests, as well as all dose/response data. Total residual
chlorine of the effluent toxicity sample must be measured and reported if chlorine is employed for
disinfection of the waste stream.
Should any test data from this monitoring requirement or tests performed by the North Carolina
Division of Environmental Management indicate potential impacts to the receiving stream, this
permit may be re -opened and modified to include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum
control organism survival and appropriate environmental controls, shall constitute an invalid test
and will require immediate retesting (within 30 days of initial monitoring event). Failure to submit
suitable test results will constitute noncompliance with monitoring requirements.
I. CHRONIC TOXICITY PERMIT LIMIT (QRTRLY)
The effluent discharge shall at no time exhibit 48 hour acute toxicity as lethality in an effluent
concentration of 85% nor measure a quarterly arithmetic average chronic value less than this same
percentage of waste. The chronic value will be determined using the geometric mean of the highest
concentration having no statistically detectable impairment of reproduction or survival and the
lowest concentration that does have a statistically detectable impairment of reproduction or
survival. The presence of 48 hour acute toxicity will be determined using Fisher's Exact Test at 48
hours from test initiation. Collection methods, exposure regimes, and further statistical methods
are defined in: The North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure
(July, 1991) or subsequent versions.
The permit holder shall perform at a minimum, quarterly monitoring using these procedures to
establish compliance with the permit condition. The first test will be performed within thirty days
from the effective date of this permit during the months of January, April, July 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 first test of any single quarter measures 48 hour acute

toxicity or a chronic value less than that specified above, then multiple concentration testing shall
` be performed, at a minimum, in each of the two following months.
.A11 toxicity testing results required as part of this permit condition will be entered on the Effluent
Discharge Monitoring Form (MR-1) for the months in which tests were performed, using the
parameter code THP3B for the Chronic Value and TGA3B for the 48 hour Acute Toxicity measure
(Pass/Fail). Additionally, DEM Form AT-3 (original) is to be sent to the following address:
Attention:
Environmental Sciences Branch
Nofth'-Carolina Division of
. Environmental. Management
4401.Reedy Creek Road
Raleigh, NC 27607
Test data shall be complete and accurate and include all supporting chemical/physical measurements
performed in association with the toxicity tests, as well as all dose/response data. Total residual
chlorine of the effluent toxicity sample must be measured and reported if chlorine is employed for
disinfection of the waste stream.
Should any test data from this monitoring requirement or tests performed by the North Carolina
Division of Environmental Management indicate potential impacts to the receiving stream, this
permit nay- be re -opened and modified to include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum
control organism survival and appropriate environmental controls, shall constitute an invalid test
and will require immediate retesting (within 30 days of initial monitoring event). Failure to submit
,suitable test results will constitute noncompliance with monitoring requirements.
J. Publication of Non -Compliant Significant Industrial Users
The requirement under Part III, Section B.11. of this permit to publish a list of non -compliant
SIUs within two months of the applicable twelve month monitoring period is hereby modified to
read: "....within SIX MONTHS of the applicable twelve month monitoring period."

Ifl-smol%E
DIVISION OF ENVIRONMENT MANAGEMENT
September 8, 1995
MEMORANDUM
TO: Greg Nizich
THRU: Ruth Swanek QCD
Carla Sanderson
FROM: Jacquelyn M.Nowell
l"
SUBJECT: Request for permit modifications by CMUD-McDowell Creek W WTP
NPDES Permit No. NC0036277
Mecklenburg County
The Instream Assessment Unit has reviewed the requests for permit modifications
by the subject facility and have the following recommendations:
Item 3. Deletion of quarterly monitoring for fluoride and chloride -
In the evaluation of the self monitoring data from 1994 and 1995, the analysis indicated that
effluent limitations for fluoride and chloride were no longer needed. The maximum
predicted values for both constituents are greater than 10% of the allowable effluent
concentration. In addition, because these two constituents are consistently discharged from
the McDowell Creek V VTP, the Instream Assessment Unit is recommending the
continuation of a minimum of quarterly monitoring for fluoride and chloride for water
quality protection. The reduction from weekly monitoring of the effluent limits to only four
times per year should present some savings to the facility.
Item 10. Change of chronic toxicity test from Pass/Fail to Phase II
test procedure - I have contacted Matt Matthews of Aquatic Toxicology and he will
review this item and send a memo. Tentatively, he has indicated that he has no problems
with the change to the Chronic Phase 1I limit.
If there are any additional questions, please contact me.
cc: Rex Gleason
WLA File

0&/11/C
Post -it" Fax Note 7671
Date 9 G yJ
# of 3
pages
To O ,S
From ,;,E11
GoJDept.
Go.
Phone #
Phone #
Fax #
Fax It
B604 OR Cameron Drive, Sure 164, Charlotte, Noah Corolina 2B269,[phone], Fox: [phone]
Charlotte -Mecklenburg Utility Department
McDowell Creek WWTP
Ms. Coleen Sullins
Permits It Engineering Unit
Division of Environmental Management
P.O. Box 29535
Raleigh, North Carolina 27626-0535
Dear Ms. Sullins:
B&V Project 27461.023
B&V File A
August 11, 1995
Subject: NPOES Permit NCO036277
McDowell Creek WWTP
Mecklenburg County, NC
The 30 day public notification period for the draft McDowell Creek WWTP
NPDES permit began on July 12, 1995, and ends August 11, 1995. After
reviewing the draft permit, we offer the following colmnents on behalf of
the Charlotte -Mecklenburg Utility Department:
1. We understand the new permit is proposed to be issued August 28, 1995
and is proposed to become effective October 1, 1995.
2. Supplement to Cover Sheet - Insert a new item 2 to allow submittal of
Authorization to Construct request for 3.5 MGD treatment facility.
Current items 2 and 3 would change to 3 and 4.
Discharge limits for fluoride and chloride in effect under our current
permit have been eliminated in the draft permit for 3.0 MGD, 3.5 MGD,
and 6.0 MGD. These elements are not toxic or limited by industrial
permits and the cost of monitoring is expensive. It should also be
noted that the Davidson WTP upstream of the McDowell Creek plant is no
longer in operation. We request that the monitoring requirements also
be eliminated.
4. In past versions of other CMUD permits, a "Daily" frequency for
monitoring requirements has been defined as five of seven days per
week. Add this definition to the Effluent Limitation tables for 3.0,
3.5 and 6.0 MGD.
Define the frequency of "E - Effluent" sample location for conductivity
monitoring in the Effluent Limitation tables for 3,0, 3,5 and 6,0 MGD,
(The frequency is specified for stream samples only).

08/11/93 16:55 HLRCK & I.FATCH 4 919 733 9919 N0.728
Page 2
Ms. coleen Sullins 89V Project 27461.023
August 11, 1995
6. Remove the total residual chlorine limit and monitoring requirement
under the 6.0 MGD Effluent Limitations. The 6.0 MGD plant improvements
will add UV disinfection and eliminate all uses of chlorine except for
disinfection of plant nonpotable water.
7. Add the following note to the 3.5 and 6.0 MGD Effluent Limitation
tables: "The limits shall become effective following the first month
followin the third consecutive month when the average daily flow
exceeds 5/6.0) MGD".
8. Under Part II, Section E.6.b.(3) clarify or eliminate the 24 hour
reporting requirement. If this is interpreted to mean 1124 hours from
occurrence", this will not be practical since metals analysis take up
to 30 days to obtain results.
9. Under Part III, Section B.11. change the last sentence to "...within
six months of the applicable twelve month period". A two month
requirement is insufficient time to Publish a public notice. Results
of the reporting period are not available until January 20. Due to the
size of our program, up to five months are required after January 20 to
verify and recalculate data, and to notify users prior to notification.
10. Change the Chronic Toxicity Pass/fail Permit Limit requirement to
Chronic Toxicity Permit Limit (Phase II test procedure) similar to
those issued under NPDES Permit NCO030210 - Mallard Creek WWTP (excerpt
attached).
Please contact me if you wish to discuss.
Very Truly Yours,
e�& VEATC
David M. Parker,'P.E.
Project Engineer
Enclosure
CMUDAI/jhb
cc: Rex Gleason, DEM-Mooresville Regional Office
Barry Gullet, Charlotte -Mecklenburg Utility Department

Ur
i/11/95 16:56 BLACK & UEATCH -> 919 7M 9919 NO•7M M4
Part M Permit No. NCO030210
G., CHRONIC TOXICITY PERMIT LIMIT (QRTRLY)
. The effluent discharge shall at no time exhibit 48 hour acute toxicity as lethality in an effluent
concentration of 9090 nor measure a quarterly arithmetic average chronic value less•than this wine
e will be determined using the geom
percentage of waste. The chronic valuetric meanai lea highest
concentration. having no statistically detectable impairment of reproduction orsurvival
s
lowest concentration that does have a statistically detectable impairment of reproduction or
survival. The presence of 48 hour acute toxicity will be determined using Fishers Exact Test at 48
hours from test initiation.. Collection methods, exposure regimes, and further statistical methods
+ are defined in: 'The North Carolina Phase 11 Chronic 'Whole Effluent Toxicity Test Procedure
(July,1991) or subsequent versions.
The ermit holder shall perform at a minimum, quarterly monitoring using these procedures to
establish compliance with the permit condition, The first test will be performed within thirty days
from the effective date of this permit during the months of February, May, August and November.
Effluent sampling for this testing' shall be performed at the NPDES permitted final effluent
discharge below all treatment processes;
If the test procedure performed as the first test of any single quarter measures 48 hour acute
toxicity or a chronic ' it nic value less than that specified above, then multiple concentration testing shall
be performed, at a minirnum, in each of the two following months.
All toxicity testing results required as part of this permit condition will be entered on the Effluent
Discharge Monitoring norm (MR•1) for the months to which *tests were performed, using the
parameter code T HP3B for the Chronic Value and TGA3B for the 48 hour Acute Toxicity measure
(PasslFail): Additionally, DEM Form AT-3 (original) is to be sent to the following address:
Attention:
Environmental Sciences Branch
North Carolina Division of
Environmental Management
4401 Reedy Creek Road
Raleigh, NC 27607
Test data shall be complete and accurate and include all supporting chemical/physical measurements
performed in association with the toxicity tests as well as all dose/response data. 'Total residual
chlorine, of the effluent toxicity sample trust be measured and reported if chlorine is employed for
disinfection of the waste stream.
Should an test data from this monitoring requirement or tests performed by the North Carolina
Division of Environmental Management indicate potential impacts to the receiving stream, this
permit may be re -opened and modified to include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum
control organism survival and approFriate environmental controls, shall constitute an invalyd test•and will require immediate retestingwithin 30 days of initial monitoring event). Failure to submit
suitable test results will Constitute noncompliance with monitoring requirements.

CA(jo MC.��L4� a4t k
TOXICANT ANALYSIS
Parameter =
lFluodde
Standard =
1800.lLgA
n
BDL=1/2DL
Actual Data
RESULTS
1
650
850
Std Dev.
36.0056
2
810
810
Mean
796.406
3
820
820
C.V.
0.04521
4
800
800
5
820
820
6
790
790
Mult Factor
7
820
820
Max. Value
890
jaA
8
890
890
Max. Pred Cm
979
ligA
9
830
830
Allowable Cw
2129.0
NA
10
790
790
11
810
810
12
770
770
13
800
800
14
760
760
15
790
790
16
770
770
17
780
780
18
770
770
19
760
760
20
780
780
21
780
780
22
770
770
23
800
800
24
780
780
25
780
780
26
790
790
27
850
850
28
800
800
29
740
740
30
780
780
31
790
790
32
810
810
33
810
810
34
780
780
35
806
800
36
790
790
37
820
820
38
780
780
39
760
760
40
800
800
41
790
790
42
840
840
43
820
820
44
810
810
45
830
830
46
800
800
47
870
870
48
790
790
9/6/95 PAGE'

CA00 - AcDowt.l( Gf-L-k-
TOXICANT ANALYSIS
:11
:III
--
:1
:1'
--
•-
f
f
I
--
:11
'1
•1I
--
'
.1
:�1
:•II
�-
1
II
--
--
9/6/95 PAGE At

cm v0 - /t4c.2)6tA11 C.n Ly,
TOXICANT ANALYSIS
ammeter =
Chloride
Standard =
250000
gWl
n
BDL=1/2DL
Actual Data
RESULTS
1
30000
30000
Sid Dev.
1933.6277
2
29000
29000
Mean
27896.552
3
31000
31000
C.V.
0.0693142
4
32000
32000
5
30000
30000
6
27000
27000
Muff Factor =
1.1
7
27000
27000
Max. Value
32000
8
26000
26000
Max. Pred C
35200
pgA
9
30000
30000
Allowable Cw
295698.9
tLgA
10
27000
27000
11
29000
29000
12
27000
27000
13
28000
28000
14
29000
29000
15
28000
28000
16
26000
26000
17
28000
28000
18
27000
27000
19
30000
30000
20
26000
26000
21
28000
28000
22
30000
30000
23
29000
29000
24
25000
25000
25
27000
27000
26
26000
26000
27
24000
24000
28
25000
25000
291
M0001
000
11
9/6/95 PAGE'

Division of Environmental Management
September 6, 1995
MEMORANDUM /
To: Greg Nizich
Through: Larry Ausley
Ken EaglesonV
From: Matt Matthews A'
Subject: Whole Effluent Toxicity Permit Limit
CMUD-McDowell Creek WWTP
NPDES No. NCO036277
Mecklenberg County
The representatives of the subject facility have requested a quarterly average chronic value ("Phase H"
chronic testing) whole effluent toxicity limit be applied to its permit. Our office sees no problems with
this request and recommends that the quarterly average chronic value toxicity limit be placed in the
permit.
Please find attached appropriate permit language. If you require any further information, please contact
me at 733-2136.
Attachment
cc: Jackie Nowell
.5
0
Environmental Sciences Branch Water Quality Section

CHRONIC TOXICITY PERMIT LIMIT (QRTRLY)
The effluent discharge shall at no time exhibit 48 hour acute toxicity as lethality in an
effluent concentration of 72 % nor measure a quarterly arithmetic average chronic value
less than this same percentage of waste. The chronic value will be determined using the
geometric mean of the highest concentration having no statistically detectable impairment of
reproduction or survival and the lowest concentration that does have a statistically
detectable impairment of reproduction or survival. The presence of 48 hour acute toxicity
will be determined using Fisher's Exact Test at 48 hours from test initiation. Collection
methods, exposure regimes, and further statistical methods are defined in: The North
Carolina Phase H Chronic Whole Effluent Toxicity Test Procedure (September, 1994) or
subsequent versions.
The permit holder shall perform at a Quarterly monitoring using these procedures
to establish compliance with the permit condition. The testing will be performed during the
months of April, July, October, and January. Effluent sampling for this testing shall be
performed at the NPDES permitted final effluent discharge below all treatment processes.
If the test procedure performed as the first test of any single quarter measures 48 hour acute
toxicity or a chronic value less than that specified above, then multiple concentration testing
shall be performed, at a minimum, in each of the two following months.
All toxicity testing results required as part of this permit condition will be entered on the
Effluent Discharge Monitoring Form (MR-1) for the months in which tests were
performed, using the parameter code THP3B for the Chronic Value and TGA3B for the 48
hour Acute Toxicity measure (Pass/Fail). Additionally, DEM Form AT-3 (original) is to be
sent to the following address:
Attention: Environmental Sciences Branch
North Carolina Division of
Environmental Management
4401 Reedy Creek Road
Raleigh, NC 27607
Test data shall be complete and accurate and include all supporting chemical/physical
measurements performed in association with the toxicity tests, as well as all dose/response
data. Total residual chlorine of the effluent toxicity sample must be measured and reported
if chlorine is employed for disinfection of the waste stream.
Should any test data from this monitoring requirement or tests performed by the North
Carolina Division of Environmental Management indicate potential impacts to the receiving
stream, this permit may be re -opened and modified to include alternate monitoring
requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as
minimum control organism survival and appropriate environmental controls, shall
constitute an invalid test and will require immediate retesting (within 30 days of initial
monitoring event). Failure to submit suitable test results will constitute noncompliance
with monitoring requirements.
QP11L Version 7191

NPDES WASTE LOAD ALLOCATION
PERMIT NO.: NCO036277
PERMITTEE NAME: City of Charlotte/Charlotte-Mecklenburg Util.
FACILITY NAME: McDowell Creek Wastewater Treatment facility
Facility Status: Existing
Permit Status: Medifisagen �.
Major q Minor
Pipe No.: 001
Design Capacity: 3.0 MGD*
Domestic (% of Flow):
Industrial (% of Flow):
Comments:
15 %
RECEIVING STREAM: McDowell Creek
Class: WS-III WS-iV-C A _�'
Sub -Basin: 03-08-33
Reference USGS Quad: F15NW (please attach)
County: Mecklenburg
Regional Office: Mooresville Regional Office
Previous Exp. Date: 7/31/96 Treatment Plant Class: class IV
Classification changes within three miles:
change to WS-III and B at Mountain Island Lake.
Requested by: Greg Nizic,&50 Date: 3/20/95
Prepared by eka Date: 6 90 9r
Reviewed y: Date: 7
Modeler
Date Rec.
#
✓A-4 AJ
3 zo 5'.s-
SZ
Drainage Area (miz ) .21; 3 Avg. Streamfiow (cfs): 3 /
7Q10 (cfs) /, � Winter 7Q10 (cfs) �f L 30Q2 (cfs)
Toxicity Limits: TwC 7z %- Acu hronic
Instream Monitoring:
Upstream Y Locz
Downstream Y Loc<
ao= 3,0 Mg-0
Effluent
Characteristics
Summer
Winter
BOD5 (m )
5
/
NH3-N (mg/1)
2
2-
D.O. (mg/1)
s
S
TSS (mg/1)
30
I76
F. Col. (/100 ml)
200
Zo 0
pH (SU)
6 - f
6 9
D•1/Ly ,rtfX.
2.9
�µ
3 �
aoa
l
Comments v
V JI/

c�CAAARIOUTE
March 8, 1995
Ms. Coleen H. Sullins, P.E.
Water Quality Section
Division of Environmental Management
N.C. Department of Environment, Health,
and Natural Resources
P.O. Box 29535
Raleigh, North Carolina 27626-0535
Subject: McDowell Creek WWTP
NPDES Permit No. NCO036277
Mecklenburg County
Dear Ms. Sullins:
We are applying for a revised NPDES application for the referenced
facility. We request that this application be processed to allow a
phased expansion of the facility, with increased capacity to 3.5 mgd in
the first phase and 6.0 mgd in the second phase. This phased expansion
is as described in the Environmental Assessment dated October 19, 1994,
for which a Finding of No Significant Impact (FONSI) was issued on
January 5, 1995.
An original and two copies of the application form are enclosed, along
with a $400 application fee. Please note that a headworks analysis was
recently performed and we are waiting on laboratory results of this
analysis. This information will be forwarded as soon as it is
available.
The first phase of the improvements provides for the replacement of
diffusers in the aeration basins. This work is expected to be complete
by June of this year. The second phase will include the addition of
biological nutrient removal capabilities, effluent filtration,
ultraviolet disinfection to replace chlorine, and digester improvements
for better biosolids treatment. Construction of this phase is expected
to occur between January 1996 and May 1997.
Speculative limits were previously provided in a letter dated July 29,
1994 from Mr. Donald Safrit. In this letter, a chlorine residual limit
is recommended for the plant expansion. Since UV disinfection will be
provided in Phase II of the project, the limit will be met. However, no
changes to the existing chlorine disinfection procedures are proposed
for Phase I. We therefore request that until the actual annual average
flows for the plant reach the currently permitted 3.0 mgd capacity, the
current permit remain in effect with no chlorine residual limit. Our
Administration Division 5100 Brookshire Boulevard Charlotte, NC 28216 704/399.2221
Charlotte -Mecklenburg Utility Department

Page 2
Ms. Coleen H. Sullins, P.E. March 8, 1995
projections indicate that the actual plant flows will not reach 3.0 mgd
until the Phase II improvements are complete and the UV system can be
operated (May 1997 or later).
The speculative limits also included a total nitrogen limit of 4 mg/L
(8 mg/L winter). It is our understanding that this limit was included
somewhat arbitrarily, and that it is not based on a detailed engineering
analysis. We have discussed this issue with the Mecklenburg County
Department of Environmental Protection and we are in agreement that such
a limit should not be imposed without adequate study to determine the
nutrient levels necessary to protect water quality. We propose a total
nitrogen limit of 10 mg/L be considered instead.
A total nitrogen limit of 10 mg/L can be reliably met through the
activated sludge BNR treatment process that is proposed. However, a
total nitrogen limit of 4 mg/L can only be met by feeding methanol to
the filter influent, allowing biological denitrification to occur within
the filters. The capabilities for feeding methanol will be installed
during Phase II, but we prefer to use the filters for solids removal
only unless further nitrogen removal is warranted.
If there are any questions or if any additional information is required,
please contact me at [phone].
Very truly yours,
CHARLOTTE-MECKLENBURG UTILITY DEPARTMENT
Barry M. Gullet, P.E.
Assistant Director
Enclosures
cc: David M. Parker, Black & Veatch
Mr. Don Willard, MCDEP

N.Q DEPT. 00
ENVIRONMENT, f LTH,
.. -. 1& NATURAL,CES
Facility Name:
NPDES No.:
Type of Waste:
Facility Status:
Permit Status:
Receiving Stream:
Stream Classification:
Subbasin:
County:
Regional Office:
Requestor:
Date of Request:
Topo Quad:
JUN 14 1995
FACT SHEET FOR WASTELOAD ALLOCATION
CMUD-McDowell Creek W WTP
NCO036277
85% Domestic / 15% Industrial
Existing
Renewal
McDowell Creek
WS-III
030833
Mecklenburg
Ntzich
3/20195
F15NW
OIVIVON OF ENVdOO' ENT.9L MANAGEMENT
Request # MOO!t�i�@ ONAL OFFICE
Stream Characteristic:
USGS #
Date:
Drainage Area (mi2):
28.3
Summer 7Q10 (cfs):
1.8
Winter 7Q10 (cfs):
4.2
Average Flow (cfs):
31
30Q2 (cfs):
IWC (%):
72%
Wasteload Allocation Summary ReneW aP W/ Emi-j'r6 Li Iwi15
(approach taken, correspondence with region, EPA, etc.)
Facility is requesting renewal of existing NPDES permit with a two stage flow increase to 3.5 & 6
MGD. Tertiary limits for the expansion flows of 3.5 and 6 MGD were previously determined in
July,1994 letter. As part of a McDowell Creek watershed study, nutrient loading and eutrophic
response in Mt. Island Lake has been reviewed. This W WTP is considered the largest source of
nutrient input to the Lake. Nutrient limits of 1 mg/l TP and 4 & 8 mg/1 TN have been
recommended. Facility requested a TN limit of 10 mg/1, a staff review indicates that a limit of 10
mg/1 TN will not adversely impact the receiving waters and we will concur with the CMUD's
request. A review of metals data indicates that some permit limits and monitoring requirements
should be revised and monitored through the Pretreatment LIMP.
Special Schedule Requirements and additional comments from Reviewers:
Recommended by: d , Date: 6/6/95
Reviewed by
Instream Assessment:
Regional Supervisor:
Permits & Engineerin
RETURN TO TECHNICAL SERVICES BY: J U L 0 8 1"5

CONVENTIONAL PARAMETERS
Existing Limits:
Monthly Average
Summer
Winter
Wasteflow (MGD):
3.0
3.0
BOD5 (mg/1):
5
11
NH3N (mg/1):
2
2
DO (mg/1):
5
5
TSS (mg/1):
30
30
Fecal Col. (/100 ml):
200
200
PH (SU),:
6-9
6-9
Residual; Chlorine (µg/1):
monitor
monitor
TP (mg/04
monitor
monitor
TN (mgn): monitor monitor
Recommended Limi
Monthly Average
Summer
Winter WQ or EL
Wasteflow (MGD):
3.0
3.0
BOD5 (mg/1):
5
11
NH3N (mg/1):
2
2
DO (mg/1):
5
5
TSS (mg/1):
30
30
Fecal Col. (/100 ml):
200
200
PH (SU):
6-9
6-9
Residual;Chlorine (µg/1):
monitor
monitor
TP (mg/1):
monitor
monitor
TN (mg/1):
monitor
monitor
Limits Changes Due To:
Change in 7Q10 data
Change in stream classification
Relocation of discharge
Change in wasteflow
Other (onsite toxicity study, interaction, etc.)
Instream data
New regulations/standards/procedures
New facility information
(explanation of any modifications to past modeling analysis including new flows, rates, field data,
interacting discharges)
(See page 4 for miscellaneous and special conditions, if applicable)

TOMCS/METALS
Type of Toxicity Test: Chronic Ceriodaphnia P/F
Existing ,Limit: 72%
Recommended Limit: 72%
Monitoring Schedule: JAN APR JUL OCT
ExistingLimits
Daily Max.
Cadmium (ug/1):
2.8
Chromium (ug/1):
monitor
Copper (ug/1):
monitor
Nickel (ug/l):
35
Lead (ug/l):
35
Zinc (ug/1):
monitor
Cyanide (ug/1):
6.9
Chloride (mg/1):
monitor
Fluoride (mg/1):
2.5
Silver (ug/1):
monitor
' = s.T- a I I!M
Cadmium (ug/1):
Mercury (ug/1)
Copper (ug/1):
Lead (ug/1):
Zinc (ug/1):
Cyanide (ug/1):
Chloride (mg/1):
Fluoride (mg/1):
Daily Max.
2.8
monitor
monitor
35
monitor
6.9
grtrly monitoring
grtrly monitoring
Limits Changes Due To:
Change in 7Q10 data Change in stream classification
Relocation of discharge
Change in wasteflow
New pretreatment information
Failing toxicity test
Other (onsite toxicity study, interaction, etc.)
WQ or EL
Pammet EW Affected
Ni, Cr„Hg will be
monitored in the
Pretreatment LTMP
Ag-will be dropped
X_ Parameter(s) are water quality limited. For some parameters, the available load capacity of
the immediate receiving water will be consumed. This may affect future water quality based
effluent limitations for additional dischargers within this portion of the watershed.
No parameters are water quality limited, but this discharge may affect future allocations.

4
INSTREAM MONITORING REQUIRE
Upstream Location: @ Beatties Ford Road
Downstream Location: @ Neck Road
Parameters: Temperature, DO, Fecal Coliform, Conductivity
Special instream monitoring locations or monitoring frequencies:
MISCELLANEOUS INFORMATION & SPECIAL CONDITIONS
A ftuacy of Existing Treatment
Has the facility demonstrated the ability to meet the proposed new limits with existing treatment
facilities? Yes No
it
If no, which parameters cannot be met?
Would a phasing m of the new limits be appropriate? Yes No
If yes, please provide a schedule (and basis for that schedule) with the regional
office recommendations:
If no, why not?
Wasteload sent to EPA? (Major) (Y or N)
(If yes, then attach schematic, toxics spreadsheet, copy of model, or, if not modeled, then old
assumptions that were made, and description of how it fits into basinwide plan)
Additional Information attached? (Y or N) If yes, explain with attachments.

Facility Name CMUD- McDowell
Permit # NC0036277_ Pipe # 001
CHRONIC TOXICITY PASS/FAIL PERMIT LIMIT (QRTRLY)
The effluent discharge shall at no time exhibit chronic toxicity using test procedures outlined in:
1.) The North Carolina Ceriodaphnia chronic effluent bioassay procedure (North Carolina Chronic Bioassay
Procedure - Revised *September 1989) or subsequent versions.
The effluent concentration at which there may be no observable inhibition of reproduction or significant mortality
is 72_% (defined as treatment two in the North Carolina procedure document). The permit holder shall
perform Quark monitoring using this procedure to establish compliance with the permit condition. The first
test will be performed after thirty days from the effective date of this permit during the months of
JAN APR JUL OCT .. Effluent sampling for this testing shall be performed
at the NPDES permitted final effluent discharge below all treatment processes.
All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge
Monitoring Form (MR-1) for the month in which it was performed, using the parameter code TGP3B.
Additionally, DEM Form AT 1 (original) is to be sent to the following address:
Attention: Environmental Sciences Branch
North Carolina Division of
Environmental Management
4401 Reedy Creek Road
Raleigh, N.C. 27607
Test data shall be complete and accurate and include all supporting chemical/physical measurements performed in
association with the toxicity tests, as well as all dosetresponse data. Total residual chlorine of the effluent toxicity
sample must be measured and reported if chlorine is employed for disinfection of the waste stream.
Should any single quarterly monitoring indicate a failure to meet specified limits, then monthly monitoring will
begin immediately until such time that a single test is passed. Upon passing, this monthly test requirement will
revert to quarterly in the months specified above.
Should any test data from this monitoring requirement or tests performed by the North Carolina Division of
Environmental Management indicate potential impacts to the receiving stream, this permit may be re -opened and
modified to include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control organism
survival and appropriate environmental controls, shall constitute an invalid test and will require immediate
retesting(within 30 days of initial monitoring event). Failure to submit suitable test results will constitute
noncompliance with monitoring requirements.
7Q10 1.8 cfs
Permitted Flow 3.0 MGD
IWC 72 %
Basin & Sub -basin CTB33
Receiving Stream McDowell Creek
County Mecklenburg
R mmended by:
Date 6J6 5
QCL P/F Version 9191

TOXICANT ANALYSIS
Facility Name
CMUD-McDowell Cr WWTP
NPDES #
NCO036277 '
ow MGD
3!
7010s cfs
1.8•.
/WC %
72.091
Rec'ving Stream
McDowell Creek i
Stream Class
WS-III
FINAL RESULTS 1
Cadmium
Max. Pred Cw
7••u A
Allowable Cw
2.81u A
Max. Value
51
Nickel
Max. Pred Cw
19.5'ugA
Allowable Cw
122.11u
Max. Value
Lead
Max. Pred Cw
Allowable Cw
15.8jugA
Max. Value
snide
Max. Pred Cw
Allowable Cw
.
Max. Value
41
Fluoride
'
Max. Prod Cw
Allowable Cw
2
Max. Value
Chromium
121.75:!u
Max. Pred Cw
AilowableCw
Max. Value
Copper
1
Max. Pred Cw
481ugA
Allowable Cw
9.7!ugA
Max. Value
32':
Zinc
1
Max. Prod Cw
199.5!u A
Allowable Cw
69.4':ugA
Max. Value
1331
Chloride
i
Max. Pred Cw
35200!u
Allowable Cw
346774.21ugA
Max. Value
320001
Silver
Max. Pred Cw
21 ! u A
Allowable Cw
0.1 ! ugA
Max. Value
151
Arsenic
Max. Pred Cw
ugA
Allowable Cw
69.41 u
Ri'vol✓w 8tk-1141td -
o,;�y c 10 .'.. 1494
.-A UTMP a<m. E.4 LIMIT
DROP all SL rd LIMY
McA;T°✓i j,,jj �^,,6, 0t L14e11
}rIn N cloc,/1 ;d k I;M,ftd
ct" l,; yl,t q.5
S�„�. se�lai� twig 4� l�M
(LTRL`F Man 1 �
pu,drtw&S eDc
in LIMP I DROP
Cn+oniiA/
�gaTa�y nw,i1T>2
Few
i1GG✓iK✓E 601-1
of S, l�ta✓cL
i,j LTM�'bRnP
6/6/95 PAGE t

TOXICANT ANALYSIS
Max. Value
Mercury
Max. Pred Cw
A1.7.
Allowable Cw
Value
.._.._.._.._.._.._.._.._.._.._..__Max.
�frot�GYw.ovr/ ��.ilL� v
6:1:m IV 'Watlacl AM
4KccP" / m QswvCL
iN CT,1P
6/6/95 PAGE,

3(l ntGn = 6,tc7qw 1 5,4f6;V , S��Fs 79 o 7,: oo�o
3 1�1 = �v.cs� i�y�/ (o.d/z �J/�% - 0,07 _�o.a/7 �di2
?,S mry (S.�crS /,,)PT l o o�z L�� 0= Z = d, D/S7µJ�e = o.°r6
a 6Nf=('7�.3 c{S t /, %c7j�i o,d/2 if/)�/- rJ,/,3L
9,3r r 11

Facility: cmud-Mcdowell CR
NPDES#: nc0037277
Receiving Stream: mcdowell cr
Comment(s):
Low Flow Record Station Number.
Hydrologic Area Number.
Drainage Area Low Flow Record Station:
Gave Low Flow Record Station:
s7Q10 Low Flow Record Station:
w7010 Low Flow Record Station:
3OQ2 Low Flow Record Station:
1.60 cfs
3.90 de
"0 cfs
must be < 4W sq. miles
Drainage Area New Site:
28.30 sq. miles
MAR New Site:
1.1 cfafmiles squared
Qave per Report Equation:
32 cfs
s7Q10 per Report Equation:
1.15 cfs
w7010 per Report Equation:
3.79 cfs
3002 per Report Equation:
5.07 do
Continue
Drainage Area Ratio: 1.08 :1
[ new DA / Da at gage ] Continue
Weighted Ratio: 0.97 :1
Over -ride Inappropriate Site (y ):[-
Drainage Area New Site:
MAR New Site:
Weighted Gave per Report Equation:
Weighted s7Q10 per Report Equation:
Weighted w7010 per Report Equation:
Weighted 3OQ2 per Report Equation:
28.30 miles squared
1.1 cfs/miles squared
32 cfs
1.71 de
4.19 de
4.85 de

CMUD-MCDOWELL CREEK WWTP
MCDOWELL CREEK WS-III
030833
JMN
615195
Facility requesting renewal of existing NPDES permit with modification of flow
from 3.0 MGD to 3.5 and 6 MGD. Speculative letter had been done by Steve Bevington
in July 29,1994 that determined conventional limits at 3.5 and 6 MGD, also included the
speculative nutrient limits of 1 mg/l TP and 4 and 8 mg/l TN @ 6 MGD.
A review of previous WLAs indicated that initial tertiary limits for the MCDowell
Creek WWTP were given in 1982. Have been renewed each year, in 1987 I ran a model
that predicted that 5/21 limits in the summer did not protect DO, however the limits were
already permitted and no DO problems were seen in the instream data being collected. Bev
said that in the expansion limits given, equivalent loading was applied at 3.5 and 6 MGD.
Felt with the construction of the new plant that the stringent limits, both for BOD5 and
NH3 could be met with new treatment.
A study of nutrient loading in the McDowell Creek watershed and the eutrophic
response in Mountain Island lake is being conducted by DEM and Mecklenburg County.
Preliminary data collected indicates that the McDowell Creek WWTP is the largest source
of nutrients to the McDowell Creek arm of Mountain Island Lake. The Catawba Basin
management strategy states that this facility will be required to implement nutrient removal
upon major modification or expansion. Facility requested modification of summer/winter
total nitrogen limit from 4 and 8 mg/l to 10 mg/l, year-round. Bevington reviewed this
request and determined that a limit of 10 mg/l TN would not adversely impact Mt. Island
Lake and recommended that 10 mg/l TN be given.
The review of stream flow indicates that flows are slightly different, s7Q10 flow
goes from 1.8 cfs to 1.7 cfs: QA from 31 cfs to 32 cfs, w7Q10 = 4.2 cfs, new 30Q2 = 4.8
cfs.
A review of instream data shows no dissolved oxygen problems, lowest reported
downstream was 5.4 mg/l in July 1993. Most instream standard violations occurred with
fecal coliform which was nearly always above 200. It should be noted that upstream values
were also, above 200, some as high as 2000/100 ml. DMR data shows that WWTP is
consistently meeting the fecal limit, in fact the avg. is <40/100ml. Perhaps there is farm
land or something upstream that could explain, the high fecal levels upstream and
downstream of the plant. Staff report states that water supply intake is located a few miles
downstream on ML Island Lake. Lake also used for primary and secondary recreation.
RECOMMENDATIONS:
Limits recommended in the July 1994 letter for 3.5 and 6 MGD have been
given at this expansion request. Tox analysis data has been reviewed and
limits for cadmium, lead and cyanide have been retained. Limit and
monitoring for nickel and silver have been dropped. Nickel will be
monitored in the LTMP. Monitoring for mercury has been added, due to
data in DMR. Analysis shows it should be limited but CMUD-McDowell
has not had limit or monitoring requirement before. Qrtrly monitoring for
fluoride and chloride from previous limit and monthly monitoring,
respectively.

WHOLE EFFLUFN'FTO)OCITY TESTING O[SELLMONITORING SUMMARY] Tue,Meyl6,1995
rAruT
RFOU1RF.MF.NT
CLINTQN-LARKINS WPCF PIMM CUR LIM:90%
at PASS
-
FAIL
PASS
-
FAIL
LATE
PASS
PASS
-
-
FAIL
NC00201170001 Ik m9JIN2 Fys,., : Q 1'A' A MAR JUN SI:P DLC
NunConlp:SINGIE
92 FAIL
FAIL
FAIL
FAIL
PASS
PASS
-
-
00.0
-
-
.90.0
County:SAMPSON Region: FAO Subhasm:CPr19
93 85.0
32.0.>901
>90.0
>90.0
>90.0
>Iloo
>No
>100
>wLo
swA
85.0
>90.0
PP. 3.0 Spccl.l SOC: e/17/92.55195 Q ChV MONK (90.80.60.40.25%) NO A
W -
-
LATE
LATE
>90
>90
-
-
B4.9
-
-
>90
7Q10:000 1WC('g)'10000 Ord
05 -
-
>90
CMUD-IRWIN CREEK WWI? M-PERM CHR LIM:83%
V et FAIL
FAIL
PASS
PASS
-
-
PASS
-
-
PASS
-
-
NCOD24945J001 Regin:l I/191 Fee sency: Q PIP A JAN APR JULOCF
NonComp:Avg ChV
92 58.7
70.6
>90.0
>W.o
--
-
70.8
M
>95.0
>95.0
-
-
Cow1y:MECKLENOURG Regims MRO Subbasin: C11134
93 92.5
-
-
>95.0
--
-
>95.0
-
-
>95.0
-
-
PF: 15.0 6pecial
94 >9S0
-
-
>95.0
-
-
>95
-
-
86.43
-
-
7QI0:490 IWC(%)'826 ONe:
95 >95
-
-
CMUD-MALLARDCRKWWIP PERM CID( LU5:90%
91 -
PASS
-
-
PASS
-
-
PASS
-
-
PASS
-
NCD03021D001 Regio:9/193 Fmq.Cnry:Q PIP A FEB MAY AUG NOV
NonComp:SINGLE
92 -
PASS
-
-
PASS
-
-
PASS
-
-
PASS
-
Coomy:MECKLENDURG Region:MRO Subb i.:YADII
93 -
PASS
-
---
PASS
--
-
PASS
-
-
PASS
-
PF:6.0 Speel.l
94 -
PASS
-
-
PASS
-
-
PASS
-
-
PASS
-
7Q10:064 IWC(%):N0 oru.:
95 -
Pa..
-
CMUD.MCALPWE W WfP P241ERM CIIR LIM:90%
Y el -
-
PASS
-
-
PASS
-
--
PASS
---
-
PASS
NCO02497MOI Oegia:1111191 Fiequenry. Q Pfr A MAR JUN SEP DI!C
N..Comp:Avg ChV
92 -
-
PASS
-
-
PASS
-
-
PASS
--
-
PASS
Coumy:MECKLQ40URG Regbm:MRO Subbacis: CTIN
93 -
-
PASS
-
-
PASS
-
-
PASS
-
-
FAIL
PF: 30.0 Speci.l
94 PASS
M
PASS
-
-
>Be
--
-
IATE
>99
-
Pas.
7Q10:03 IWC(%h9935 Omer:
95 -
-
Pas.
CMUD-MCDOWFL. CREEK WWTP PERM CHR LIM:72%
Y 91 PASS
-
-
PASS
-
-
PASS
-
-
PASS
-
-
NCO036277901 Begla:5/1193 rmgnency: Q PIP A APR JUL OCT JAN
Nm,Comp:SWGIE
92 PASS
-
-
PASS
-
-
PASS
-
-
PASS
-
_
C.mmty:MliCrJJNOURG Rcgion:MRO Su1ulwin:C11133
Ba PASS
-
--
PASS
--
--
PASS
-
---
PASS
I111:3.00 .1,00
04 PASS
-
---
PASS
---
-
FAIL
PASS
--
PASS
---
--
7Q1),180 IWC(%):72W Order:
95 P...
-
--
CMUDSUGAR CREEK WWI? N-PFRM CHR LIM:87%. 90% IN V 195
91 PASS
PASS
-
--
PASS
-
-
PASS
-
-
PASS
-
NCO024937/001 Beet:l l/l/91 Freryency: Q PA' A FEB MAY AUG NOV
N..C.mp:Avg ChV
92 -
PASS
-
--
>00.0
-
-
88.5
-
-
>eD
-
COuaIy:MLCKLENDURG Rcgion:MRO Subbmin:CID34
93 -
>90
-
-
72.3
>9D
>90
>90
-
-
>90
-
111414.67 Speei.l
as -
66.75
>05
>as
>05
-
-
>95
-
-
02.47
-
7QI6350 rwC(%)'N966 O.lee
95 -
>95
-
COATSAMIWCAN 1.111:4811R AC DAPN OR C'1R110
91 --
-
-
-
--
--
-
-
-
-
-
-
NCOD00108901 Begin:10/193 Frequency: M MONT70.Y
NonComp:
92 -
-
-
-
--
-
-
-
-
-
-
-
Comly:TRANSYLVANIA Region:ARO Subbsin:IgtR01
93 -
-
-
-
-
'-
-
-
-
-
72.8'
63.9'
PF:0.015 Sitarist
_
94 >90.0'
>No'
>00.0-
40.2'
>W'
22.076-
>90'
60.16'
>99'
40.15'
64.54'
NRQ9.91'
7Q10: 0.43 IWC(%):5.12 0'br.
95 19.88'
66.7'
>100'
COATSAMMUCAN-SEVIERPLANf PERMCHRLIM:1596
91 PASS
fan 5
--
-
PASS
-
PASS
PASS
NCOD042431001 Beeia:9/l93 Frc screq: Q P/F A FFD MAY AUG NOV
NnmComp:SINGLE
92 -
PASS
--
---
PASS
--
-
PASS
-
-
PASS
-
Coomy:MCDOWFL. Region: ARO S.bb.m:CTE130
93-
PASS
--
-
PASS
-
---
PASS
-
-
PASS
- ,
PF: 2.00 Sperial
Its-
PASS
-
-
PASS
_
PASS
_
_
PASS
_
7QI01800 IWC(%)'1470
95 -
Pass
-
COGENTRIKINC OFROCKY MOUNr PERM Cl IR LIM:3.3%(GRAB)(NL•'W Pt"rf V195)
91 -
PASS
-
-
PASS
...
-
PASS
-
-
PASS
-
NCO077437901 Degln:5/1190 rmyscnny: Q PIP A =- MAYAUG NOV
N..Cmmp:
92 -
PASS
-
--
PASS
-
-
PASS
-
--
FAIL
PASS
CoumpEOGECOMDL' Region: RRO Subb..in:T'AR02
93 --
PASS
-
-
PASS
--
--
PASS
-
--
PASS
-
PP: 0.901 S'd.l
94 -
PASS
-
-
PASS
---
-
PASS
---
-
PASS
-
7Q10, 40.7 MC(%): 3.3 ONe:
95 -
Pa..
-
COG INIRIXLEASWGCORI'ORAT'ION-003 PERM CIIR I.IW9D%
9t -
-
-
-
-
-
-
-
-
-
-
-
NC0058271000J Wpn:l'102 Pax cay:Q PIF A 1081 MAY AUG NOV
NonComp:Sm,,Ic
92 -
PASS
-
-
FAIL
PASS
-
PASS
-
-
PASS
-
County:DUPLIN Regina: WO(O Subbsm:CPF22
83 -
PASS
-
-
PASS
-
-
FAIL
PASS
-
PASS
-
PF: VAR Sp,dA
94 -
PASS
-
-
PASS
-
-
PASS
-
-
PASS
-
7QI0:0.0 IWC(%): IM-0 (lmer.
95 --
P.u.
-
COG1 I'RMI HASWO CT)RI'OItA'1'IUNNUI PliRM AC LIM:NO AC 1:1111)(URAO)
ul --
-_
PASSI
-
-
PASSI
---
_.
PASSI
---
-
PASSI
NCOD59297MM Dcgia:9/191 Frs(umuc, Q P/F A MAR JUN SUP DEC
No.Comp:
92 -
-
PASSI
-
-
PA ;SI
-
-
PASSI
-
-
PASSI
Co..ty:BLADIN Region: PRO Suhhsin: Cl'FI6
, -
-
PASSI
-
-
PASSE
-
-
PASSI
-
-
PASSI
PF:0.10 SI'crl.l
04 -
.-
PASSI
-•
-
PASSI
-
-
PASSI
-
-
PASSI
7QIO: 740.00 IWC(%):0.02 Order.
95 -
-
Pa..(
0 2 eeo.er.6ye Wi. a u nificaat.ormmphence V 11. 1991 Dm.AVnllable
LEGEND:
PERM=Permit Raqumment Ibf=Adminuwivu Jetty -Target Fregwacy= Mouddming frtqucncy: Q. Quantedy: M- Monthly:RM. Dimoeddy;SA- Srmiannwlly: A -Annually; OWD-Only wines di.ciwging:D-D'uc.ntinued rumisming rtVuirtment;IS- Conducting independent study
Beeln=F.Ismathrt ancri 7Q10=Receiving aucam low Dow cmeion (c&) A=rluarudyess iuringirt... mmomWyupem,m cIwIurt Moodu Out wing mm occw-ea. IANAPRJUL,OCf NonComp= Current C.mdaace Requiernent
PF-P,mwtad B.w(MGD) IWC%=lnuremnwmtems nnvniun PIP= 1 ss'ail chronic test AC=Acme CIIRR=Chronic
Data Nwa ion: f-Fmhead Minnow: • - Cerinl.elmia 104 my - Mvsid shrimp: ON - Chroniu value: P - Mortality of rimed ouranlnae.t hlabcst concentration: at - Perfomwd by DIIM Tax Lval Gmuo; M - Red tat
Aeponiog Noutiam-.DIN aoUequirtd; NR-Not rtpetuJ:O-Beginning of Quunm Facility Activity Smtw: 1-Inactive. N- Newly Lymed(To comuw:O: it -Active but ne discharging;7•Mom duu avail.ble for month in qualms SIG =ORCri,.. needed
10

Page
Note for Jackie Nowell
From: Steve Bevington
Date: Fri, May 12, 1995 1:38 PM
Subject: CMUD McDowell Creek WWTP
To: Jackie Nowell
Preliminaty model data suggest 10 mg/1 TN at WWTP will not advesely impact Mountain
Island Lake. If you send approval sbhet out, I will have final results before notice period.

To: Pcrm;tn nnd Unit
Watcr Quality SC.rt if^.
Attention: rr 7 A,+-ich
Date: April 19, 1995
NPDES STAFF REPORT AND RECOMMENDATION
County: Mecklenburg
MRO No.: 95-54
Permit No. NCO036277 (Modification)
PART I - GENERAL INFORMATION ,
1. Facility and Add ss. Charlotte - Mecklenburg Utility Dept.
McDowell Creek WWTP
r/ 5100 Brookshire Boulevard
Charlotte, North Carolina 28216
2. Date of Investigation: N/A
3.
Report
Prepared by:
Michael L.
Parker, Environ. Engineer II
4.
Persons
Contacted and
Telephone
Number: No one.
5.
D'rec
(B&ti
to Site:
e Ford Road)
From the
and SR 2074
otions
intersection of SR 2128
(Neck Road), travel :est on
SR 2074
roximatcly
1.9 miles.
The WWTP is located on the
right side
of SR 2074
after crossing
McDowell Creek.
6. Discharge Point(s), List for all discharge points:
Latitude: 35' 22' 52" Longitude: 80' 56' 25"
Attach a USGS map extract and indicate treatment facility site
and discharge point on map.
USGS Quad No.: F15NW USGS Quad Name: Lake Norman South, NC
7. Site size and expansion area consistent with application?
Adequate area exists for the proposed expansion.
8. Topography (relationship to flood plain included): Moderately
sloping, neither the WWTP nor the expansion area is located
within the 100 year flood plain.
9. Location of nearest dwelling: None within 1000 feet.

{
Page Two
10. Receiving stream or affected surface waters: McDowell Creek
a. Classification: WS—IV CA
b. River Basin and Subbasin No.: Catawba 030833
C. Describe receiving stream features and pertinent
downstream uses: Small slow moving stream, there arc
several small wetland areas adjacent to the creek. The
CMUD water intake is located a few miles downstream on
Mountain Island Lake. The lake is also used for primary
and secondary recreation.
PART II — DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. a. Volume of wastewater to be permitted: 3.0 MGD (ultimate
design capacity)
b. Current permitted capacity of the wastewater treatment
facility: 3.0 MGD
C. Actual treatment capacity of the current facility
(current design capacity): 3.0 MGD
d. Datc(s) and construction activities allowed by previous
Authorizations to Construct issued in the previous two
years: N/A
c. Please provide a description of existing or substantially
constructed wastewater treatment facilities: The
existing WWT facilities consist of 2 manual bar screens,
grit removal, influent pumping, 2 primary clarifiers, 2
trickling filters, first stage aeration, 2 intermediate
clarifiers, second stage aeration, 2 final clarifiers,
aerated polishing pond, 4 anaerobic sludge digesters, and
chlorination.
f. Please provide a description of proposed wastewater
treatment facilities: The WWTP improvements proposed for
phase I involves the replacement of the diffusers in the
aeration basins. The second phase (phase II) will include
the addition of biological nutrient removal (aerobic,
anoxic and anaerobic processes), effluent denitrifying
filters, ultraviolet disinfection, and sludge thickening.
g. Possible toxic impacts to surface waters: This facility/
has a history of compliance with toxicity testing.
h. Pretreatment Program (POTWs only): The CMUD has an
approved pretreatment program. There are 3 significant
industrial users permitted to discharge process
wastewater to the WWTP.

Page Three
2. Residuals handling and utilization/disposal scheme: Residuals
treatment consists of four anaerobic digesters, sludge drying
beds, and land application.
a. If residuals are being land applied, please specify DEM
permit no.: W00000057
Residuals Contractor: Bio Gro, Inc.
Telephone No.: [phone]
b. Residuals stabilization: PSRP
3. Treatment plant classification: Class IV (rating will not
change as a result of the proposed expansion).
4. SIC Codc(s): 4952
Wastewater Code(s): 01
Main Treatment Unit Code: 11503
PART III - OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction Grant
funds or arc any public monies involved (municipals only)?
The proposed WWTP modifications will be funded with public
monies.
2. Special monitoring or limitations (including toxicity)
requests: Effluent limitation changes are projected upon
expansion. No additional monitoring and/or limitations are
recommended at this time.
3. Important SOC, JOC or Compliance Schedule dates (Please
indicate): N/A
4. Alternative Analysis Evaluation: N/A
PART IV - EVALUATION AND RECOMMENDATIONS
The permitter, Charlotte - Mecklenburg Utility Department, has
applied for approval to expand the sub,jcct facility from the
current capacity of 3.0 MGD to 6.0 MGD (the capacity will
temporarily go from 3.0 to 3.5 MGD in the first phase of the WWTP
expansion). The WWTP expansion is the result of the tremendous
growth in the northern part of Mecklenburg County.
Mr. Barry Gullet, Assistant Director with CMUD, has requested
that a proposed residual chlorine limit, which is anticipated upon
expansion, not take effect until annual effluent flows average 3.0
MGD. The proposed chlorine limit should not take effect until plant
capacity has been increased (upon completion of an expansion),
therefore, no action is necessary on Mr. Gullet's request.

Page Four.
Mr. Gullet has also requested that the "speculative" TN limits
developed by the Division of 4.0 mg/1 (summer), 8.0 mg/1 (winter)
not be imposed until a study be conducted to determine the levels
ngcessary to protect WQ. It is Mr. Gullet's contention, based on a
July 29, 1994 letter from Don Safrit, that the speculative limits
should not be imposed without further instream data. The McDowell
Creek watershed was studied for the past two (2) years and
recommendations in the form of a Management Plan were expected to
indicate the need for nutrient removal at the subject facility.
This Office is unaware of the results of this study, however, if
the recommendations of the Management Plan (based on the
accumulated data) point to the need for nutrient removal then the
proposed TN limitations should remain. It should be noted that the
final decision on the need for nutrient limitations should come
from the TSB.
It is recommended that the permit be modified as requested
pending final approval of the WLA and the resolution of the
concerns addressed by Mr. Gullet.
Signature of e
port preparer
Water Quality Acgi4n61 Supervisor
p:1dsr1dsr951u dovell.cr
Date
J
ate

NPDES WASTE LOAD ALLOCATION
PERMIT NO.: NCO036277
PERMy= NAME: City of Charlotte/Charlotte-Mecklenburg Util.
FACILITY NAME: McDowell Creek Wastewater Treatment facility
Facility Status: Existing
Permit Status: 4&di€ieatien
Major 1t Minor
Pipe No.: 001
Design Capacity: 3.0 MGD* �j=
Domestic (% of Flow):
Industrial (% of Flow):
Comments:
me
15 %
RECEIVING STREAM: McDowell Creek
Class: WS-III
03-08-33
Reference USGS Quad: F15NW (please attach)
County: Mecklenburg
Regional Office: Mooresville Regional Office
Previous Exp. Date: 7/31/96 Treatment Plant Class: class IV
Classification changes within three miles:
change to WS-III and B at Mountain Island Lake.
Requested by: Greg Niricli�l� Date: 3/20/95
Prepared bDate: 30 5,r
Reviewed y'jj&j D te:
a—s 3 t w
Modeler
Date Rec.
#
-fMN
5'S
SZ
Drainage Area (mil ) .f 3 Avg. Streainflow (cfs): 3 z
7Q10 (cfs) 1. 7 Winter 7Q10 (cfs)
Toxicity Limits: IWC 14
Instream Monitoring:
Parameters
Upstream
Downstream
dJ s 3,SAf6,0
5� L 30Q2 (cfs) 54
Acu Chronic
Effluent
Characteristics
Summer
Winter
BODS (m )
5
//
NH3-N (mg/1)
Z
Z
D.O. (mg/1)
S
55
TSS (mg/1)
30
30
F. Col. V100 ml)
200
Zoo
pH (SU)
6'2
6
(ems x iu (
33
/
G.6
Comments: J JU

Facility Name:
NPDES No.:
Type of Waste:
Facility Status:
Permit Status:
Receiving Stream:
Stream Classification:
Subbasin:
County:
Regional Office:
Requestor:
Date of Request:
Topo Quad:
FACT SHEET FOR WASTELOAD ALLOCATION
CMUD-McDowell Creek W WTP
NCO036277
85% Domestic / 15% Industrial
Existing
Renewal/Cx F"-6i 0 ✓1
McDowell Creek
WS-III
030833
Mecklenb
Mooresvill
Nizich
3/20/95
F15NW
Request # 8268 (b)
Stream Characteristic:
USGS #
Date:
Drainage Area (mi2):
28.3
Summer 7Q10 (cfs):
1.7
Winter 7Q10 (cfs):
4.2
Average Flow (cfs):
32
30Q2 (cfs):
4.9
IWC (%):
76%
Wasteload Allocation Summary EXp&hS/ V-PL- * 3. 5 yk 9c1
(approach taken, correspondence with region, EPA, etc.)
Facility is requesting renewal of existing NPDES permit with a two stage flow increase to 3.5 & 6
MGD. Tertiary limits for the expansion flows of 3.5 and 6 MGD were previously determined in
July, 1994 letter. As part of a McDowell Creek watershed study, nutrient loading and eutrophic
response in Mt. Island Lake has been reviewed. This W WTP is considered the largest source of
nutrient input to the Lake. Nutrient limits of 1 mg/I TP and 4 & 8 mg/1 TN have been
recommended. Facility requested •a TN limit of 10 mg/l , a staff review indicates that a limit of 10
mg/1 TN will not adversely impact the receiving waters and we will concur with the CMUD's
request. A review of metals data indicates that some permit limits and monitoring requirements
should be revised and monitored through the Pretreatment LTMP.
Special Schedule Requirements and additional comments from Reviewers:
-D67
Regional Supervisor:
Permits & Engineering:
RETURN TO TECHNICAL SERVICES BY: JUL 0 8 1995

CONVENTIONAL PARAMETERS
ExistingLimits:
Monthly Average
Summer
Winter
Wasteflow (MGD):
3.0
3.0
BOD5 (mg/1):
5
11
NH3N (mg/1):
2
2
DO (mg/1):
5
5
TSS (mg/1):
30
30
Fecal Col. (/100 ml):
200
200
PH (Sin:
6-9
6-9
Residual Chlorine (µg/1):
monitor
monitor
TP (mg/1).
monitor
monitor
TN (mg/1):
monitor
monitor
Recommended Limits:
Monthly Average
Summer
Winter WQ or EL
Wasteflow (MGD):
3.5
3.5
BOD5 (mg/1):
5
11
NH3N (mg/1):
2
2
DO (mg/1):
5
5
TSS (mg/1):
30
30
4
Fecal Col. 000 ml):
200
200
AA
PH (SU):
6-9
6-9 t el pw
Residual Chlorine (µg/l):
22
22 Qr�
TP (mg/11):
ram- t-v-, -
TN (mg/1).
&Z"I -Jr
Limits Chances Due To:
Change in 7Q10 data
Change in stream classification
Relocation of discharge
Change in wasteflow
Other (onsite toxicity study, interaction, etc.)
Instream data
New regulations/standards/procedures
New facility information
(explanation of any modifications to past modeling analysis including new flows, rates, field data,
interacting discharges)
(See page 4 for miscellaneous and special conditions, if applicable)

3
TOMCS/METALS
Type of Toxicity Test: Chronic Ceriodaphnia P/F
Existing Limit: 72%
Recommended Limit: 76%
Monitoring Schedule: JAN APR JUL OCT
Existing Limits
Daily Max.
Cadmium (ug/1):
2.8
Chromium (ug/1):
monitor
Copper (ug/1):
monitor
Nickel (ug/1):
35
Lead (ug/1):
35
Zinc (ug/1):
monitor
Cyanide (ug/1):
6.9
Chloride (mg/1):
monitor
Fluoride (mg/1):
2.5
Silver (ug/1):
monitor
Recommended Umi
Cadmium (ug/1):
Mercury (ug/1)
Copper (ug/1):
Lead (ug/1):
Zinc (ug/1):
Cyanide (ug/1):
Chloride (mg/1):
Fluoride (mg/1):
Daily Max.
2.6
monitor
monitor
33
monitor
6.6
grtrly monitoring
qrtrly monitoring
Limits Changes Due To:
Change in 7Q10 data
Change in stream classification
Relocation of discharge
Change in wasteflow
New pretreatment information
Failing toxicity test
Other (onsite toxicity study, interaction, etc.)
WQ or EL
Ni, Cr„Hg will be
monitored in the
Pretreatment LTMP
Ag-will be dropped
X Parameter(s) are water quality limited. For some parameters, the available load capacity of
the immediate receiving water will be consumed. This may affect future water quality based
effluent limitations for additional dischargers within this portion of the watershed.
•O
No parameters are water quality limited, but this discharge may affect future allocations.

4
INSTREAM MONITORING REQUIREMENTS
Upstream Location: @ Beatties Ford Road
Downstream Location: @ Neck Road
Parameters: Temperature, DO, Fecal Coliform, Conductivity
Special instream monitoring locations or monitoring frequencies:
MISCELLANEOUS INFORMATION & SPECIAL CONDITIONS
Adequacy of Existing Treatment
Has the facility demonstrated the ability to meet the proposed new limits with existing treatment
facilities? Yes No
If no, which parameters cannot be met?
Would a "phasing in" of the new limits be appropriate? Yes No
If yes, please provide a schedule (and basis for that schedule) with the regional
office recommendations:
If no, why not?
Wasteload sent to EPA? (Major) (Y or N)
(If yes, then attach schematic, toxics spreadsheet, copy of model, or, if not modeled, then old
assumptions that were made, and description of how it fits into basinwide plan)
Additional Information attached? (Y or N) If yes, explain with attachments.

Facility Name CMUD- McDowell
Permit # NC0036277_ Pipe # 001 _
CHRONIC TOXICITY PASS/FAIL PERMIT LIMIT (QRTRLY)
The effluent discharge shall at no time exhibit chronic toxicity using test procedures outlined in:
1.) The North Carolina Ceriodaphnia chronic effluent bioassay procedure (North Carolina Chronic Bioassay
Procedure - Revised *September 1989) or subsequent versions.
The effluent concentration at which there may be no observable inhibition of reproduction or significant mortality
is 76_°lo (defined as treatment two in the North Carolina procedure document). The permit holder shall
perform quarterly monitoring using this procedure to establish compliance with the permit condition. The first
test will be performed after thirty days from the effective date of this permit during the months of
JAN APR JUL OCT .. Effluent sampling for this testing shall be performed
at the NPDES permitted final effluent discharge below all treatment processes.
All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge
Monitoring Form (MR-1) for the month in which it was performed, using the parameter code TGP3B.
Additionally, DEM Form AT 1(original) is to be sent to the following address:
Attention: Environmental Sciences Branch
North Carolina Division of
Environmental Management
4401 Reedy Creek Road
Raleigh, N.C. 27607
Test data shall be complete and accurate and include all supporting chemical/physical measurements performed in
association with the toxicity tests, as well as all dosetresponse data. Total residual chlorine of the effluent toxicity
sample must be measured and reported if chlorine is employed for disinfection of the waste stream.
Should any single quarterly monitoring indicate a failure to meet specified limits, then monthly monitoring will
begin immediately until such time that a single test is passed. Upon passing, this monthly test requirement will
revert to quarterly in the months specified above.
Should any test data from this monitoring requirement or tests performed by the North Carolina Division of
Environmental Management indicate potential impacts to the receiving stream, this permit may be re -opened and
modified to include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control organism
survival and appropriate environmental controls, shall constitute an invalid test and will require immediate
retesting(within 30 days of initial monitoring event). Failure to submit suitable test results will constitute
noncompliance with monitoring requirements.
7Q10 1.7 cfs
Permitted Flow 3.5 MGD
I WC 76 %
Basin & Sub -basin CTB33
Receiving Stream McDowell Creek
County Mecklenburg
R mmended by:
)I OW4
ate 6/6/95
QCL P/F Version 9191

TOXICANT ANALYSIS
Facility Name
CMUD-McDowell Cr WWTP
NPDES #
NCO036277 '•
Ow MGD
3.5i
7010s c/s
1.7••
twC %
76.14';
Rec'ft Stream
McDowell CreekV� W�-
Stream Class
WS-III
FINAL RESULTS
Cadmium
Max. Prod Cw
VugA
Allowable Cw
2.6jugA
Max. Value
51
Nickel
I
Max. Pred Cw
19.5jugA
Allowable Cw
115.6? ugA
Max. Value
15
Lead
1
Max. Pred Cw
32.41 ugA
Allowable Cw
32.8 ugA
Max. Value
24i
snide
Max. Prod Cw
5.8jugA
Allowable Cw
6.61 ugA
Max. Value
4j
Fluoride
'
Max. Prod Cw
9791ugA
Allowable Cw
2364.1 iugA
Max. Value
890••
Chromium
1
Max. Prod Cw
Allowable Cw
—21.75jugA
65.7jugA
Max. Value
151
Copper
Max. Pred Cw
48iu
Allowable Cw
9.21ugA
Max. Value
321
Zinc
i
Max. Pred Cw
199.5 u A
Allowable Cw
ugA
Max. Value
133E
Chloride
Max. Pred Cw
35200u
Allowable Cw
328341.0u
Max. Value
320001.
Silver
Max. Pred Cw
21 u A
Allowable Cw
0.1 iugA
Max. Value
151
Arsenic
Max. Pred Cw
8.5jugA
Allowable Cw
65.71u A
E lT
marrfw<w(d L/Aq/r
JRA :Li xt°Nr�bn.
pQoO 9fl���h Roc
(`N
Q/1T2 c lr .+T art tIM -
/Id p Al-✓ACAO
AL��tti P,rcf✓t�ia�.s..�
DAP / [TMP
6/6/95 PAGE 1

TOXICANT ANALYSIS
Max. Value
51
Mercury••
Max. Prod Ow
1.7jugA
Allowable Cw
_..___.._.._.._...._.._.._.._.._.._.._.._.._.._.._.._.
Max. Value
0.01 ug/I
_._..
0.5
6/6/95 PAGE

CMUD•MCDOWELL CR WWTP
Residual Chlorine
Ammonia as NH3
(summer)
7010 (CFS)
1.7
7Q10 (CFS)
1.7
DESIGN FLOW (MGD)
3.5
DESIGN FLOW (MGD)
3.5
DESIGN FLOW (CFS)
6.425
DESIGN FLOW (CFS)
6.426
STREAM STD (UG/L)
17.0
STREAM STD (MG/L)
1.0
UPS BACKGROUND LEVEL (UG/L)
0
UPS BACKGROUND LEVEL (MG/L)
0.22
IWC (°/)
76.14
IWC (a/o)
76.14
Allowable Concentration (ug/1)
22.33
Allowable Concentration (mg/1)
1.24
Ammonia as NH3
(winter)
7010 (CFS)
4.2
Fecal Limit 20W100ml DESIGN FLOW (MGD)
3.6
Ratio of 0.3:1 DESIGN FLOW (CFS)
5.425
STREAM STD (MG/L)
1.8
UPS BACKGROUND LEVEL (MG/L)
0.22
IWC (Q/o)
56.36
Allowable Concentration (mg/1)
3.02
6/6/95

NPDES WASTE LOAD ALLOCATION
PERMIT NO.. NC0036277
PERMTITEE NAME: City of Charlotte/Charlotte-Mecklenburg Util.
FACILITY NAME: McDowell Creek Wastewater Treatment facility
Facility Status: Existing
Permit Status: -V1adfftcMamr
Major q Minor
Pipe No.: 001
Design Capacity: 3.0 MGD* I,r= 6.o MO
Domestic (% of Flow): 85 %
Industrial (% of Flow): 15-%
Comments:
RECEIVING STREAM:McDowell Creek
Class: WS-III
Sub -Basin: 03-08-33
Reference USGS Quad: F15NW (please attach)
County: Mecklenburg
Rcgional Office: Mooresville Rcgional Office
Previous Exp. Date: 7/31/96 Treatment Plant Class: class TV
Classification changes within three miles:
change to WS-III and B at Mountain Island Lake
Requested
Prepared b
Reviewed
Modeler
Date Rec.
#
Drainage Area (miz) ,fig. 3 Avg. Streamflow (cfs):
3Z
7Q10 (cfs) 1.7 Winter 7Q10 (cfs) if. Z 30Q2 (cfs) �A, 9
'toxicity Limits: 1WC � %, Acutc/ tunic
Instream Monitoring:
Upstream Y Location
Downstream Y Location
©cry G. 0 Al"
Effluent
Characteristics
Summer
Winter
BOD5 (m )
s
10
NH3-N (mg/1)
Z
;Z,S'
D.O. (mg/1)
5
5
TSS (mg/1)
3o
30
F. Col. V100 ml)
Zoo
Zw
pH (SU)
6-9
6'Q
&J..t
zo !Q
44
30

Facility Name:
NPDES No.:
Type of Waste:
Facility Status:
Permit Status:
Receiving Stream:
Stream Classification:
Subbasin:
County:
Regional Office:
Requestor:
Date of Request:
Topo Quad:
FACT SHEET FOR WASTELOAD ALLOCATION
CMUD-McDowell Creek W WTP
NC0036277
85% Domestic / 15% Industrial
Existing
Renewal/C�thSiDh
McDowell Creek
WS-III
030833
Mecklenburg
Mooresville
Nizich
3/20195
F15NW
Request # 8268 (c)
Stream Characteristic:
USGS #
Date:
Drainage Area (mi2):
28.3
Summer 7Q10 (cfs):
1.7
Winter 7Q10 (cfs):
4.2
Average Flow (cfs):
32
30Q2 (cfs):
4.9
IWC (%):
85%
Wasteload Allocation Summary EXPQoblOY1 *&Okya4
(approach taken, correspondence with region, EPA, etc.)
Facility is requesting renewal of existing NPDES permit with a two stage flow increase to 3.5 & 6
MGD. Tertiary limits for the expansion flows of 3.5 and 6 MGD were previously determined in
July, 1994 letter. As part of a McDowell Creek watershed study, nutrient loading and eutrophic
response in ML Island Lake has been reviewed. This W WTP is considered the largest source of
nutrient input to the Lake. Nutrient limits of 1 mg/l TP and 4 & 8 mg/1 TN have been
recommended. Facility requested a TN limit of 10 mg/l , a staff review indicates that a limit of 10
mg/1 TN will not adversely impact the receiving waters and we will concur with the CMUD's
request A review of metals data indicates that some permit limits and monitoring requirements
should be revised and monitored through the Pretreatment LTMP.
Special Schedule Requirements and additional comments from Reviewers:
Recommended by: / � A • s Date: 6/6/95
Reviewed by
Instream Assessment Date:
Regional Supervisor Date: ` G pS
Permits & Engineering: Ly / Date: S
RETURN TO TECHNICAL SERVICES BY: JUL 0 8 1"s

* alrA MCOU ' '. Z'a 3I vvj.
Existin,,, Limits:
Monthly Average
Summer
Winter
Wasteflow (MGD):
3.0
3.0
BODS (mg/1):
5
11
NH3N (mg/1):
2
2
DO (mg/1):
5
5
TSS (mg/1):
30
30
Fecal Col. (/100 ml):
200
200
pTT (SU):
6-9
6-9
Residual Chlorine (µg/1):
monitor
monitor
TP (mg/1):
monitor
monitor
TN (mg/1):
monitor
monitor
Recommended Limits:
Monthly Average
Summer
Winter
WQ or EL
Wasteflow (MGD):
6.0
6.0
BODS (mg/1):
5
10
WQ
NH3N (mg/1):
2
2.5
WQ
DO (mg/1):
5
5
WQ
TSS (mg/1).
30
30
Fecal Col (/100 ml):
200
200
pH (SU):
6-9
6-9
Residual Chlorine (µg/1):
2f zo
Xw
TP (mg/1):
TN (mg/1):
!
10
Limits Changes Due To:
Change in 7Q10 data
Change in stream classification
Relocation of discharge
Change in wasteflow
Other (onsite toxicity study, interaction, etc.)
Instream data
New regulationststandards/procedures
New facility information
BODS, NH3
(explanation of any modifications to past modeling analysis including new flows, rates, field data,
interacting discharges)
(See page 4 for miscellaneous and special conditions, if applicable)

TOXICS/METALS
Type of Toxicity Test: Chronic Ceriodaphnia P/F
Existing Limit: 72%
Recommended Limit: 85%
Monitoring Schedule: 7AN APR RJL OCT
Existing Limits
Daily Max.
Cadmium (ug/1):
2.8
Chromium (ug/i):
monitor
Copper (ug/1):
monitor
Nickel (ug/1):
35
Lead (ug/1):
35
Zinc (ug/1):
monitor
Cyanide (ug/1):
6.9
Chloride (mg/1):
monitor
Fluoride (mg/1):
2.5
Silver (ug/1):
monitor
Recommended Limits
Daily Max.
Cadmium (ug/1):
2.6 f WQ
Mercury (ug/1)
monitor
Copper (ug/1):
monitor
Lead (ug/1):
30 WQ
Zinc (ug/1):
monitor
Cyanide (ug/1):
f * E. °I WQ
Chloride (mg/1):
qrtrly monitoring
Fluoride (mg/1):
grtrly monitoring
Limits Changes Due To:
Change in 7Q10 data
Change in stream classification
Relocation of discharge
Change in wasteflow
New pretreatment information
Failing toxicity test
Other (onsite toxicity study, interaction, etc.)
WQ or EL
Ni, Cr„Hg will be
monitored in the
Pretreatment LTMP
Ag-will be dropped
X_ Parameter(s) are water quality limited. For some parameters, the available load capacity of
the immediate receiving water will be consumed. This may affect future water quality based
effluent limitations for additional dischargers within this portion of the watershed.
X2
No parameters are water quality limited, but this discharge may affect future allocations.

4
INSTREAM MONITORING REQUIREMENTS
Upstream Location: @ Beatties Ford Road
Downstream Location: @ Neck Road
Parameters: Temperature, DO, Fecal Coliform, Conductivity
Special instream monitoring locations or monitoring frequencies:
MISCELLANEOUS INFORMATION & SPECIAL CONDITIONS
Adequacy of Existing Treatment
Has the facility demonstrated the ability to meet the proposed new limits with existing treatment
facilities? Yes No
If no, which parameters cannot be met?
Would a "phasing in" of the new limits be appropriate? Yes No
If yes, please provide a schedule (and basis for that schedule) with the regional
office recommendations:
If no, why not?
Wasteload sent to EPA? (Major) (Y or N)
(If yes, then attach schematic, toxics spreadsheet, copy of model, or, if not modeled, then old
assumptions that were made, and description of how it fits into basinwide plan)
Additional Information attached? (Y or N) If yes, explain with attachments.

dr .
Facility Name CMUD- McDowell Permit # NC0036277_ Pipe # 001 _
CHRONIC TOXICITY PASS/FAIL PERMIT LIMIT (QRTRLY)
The effluent discharge shall at no time exhibit chronic toxicity using test procedures outlined in:
1.) The North Carolina Ceriodanhnia chronic effluent bioassay procedure (North Carolina Chronic Bioassay
Procedure - Revised *September 1989) or subsequent versions.
The effluent concentration at which there may be no observable inhibition of reproduction or significant mortality
is 76_% (defined as treatment two in the North Carolina procedure document). The permit holder shall
perform Quarterly monitoring using this procedure to establish compliance with the permit condition. The first
test will be performed after thirty days from the effective date of this permit during the months of
JAN APR JUL OCT .. Effluent sampling for this testing shall be performed
at the NPDES permitted final effluent discharge below all treatment processes.
All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge
Monitoring Form (MR-1) for the month in which it was performed, using the parameter code TGP3B.
Additionally, DEM Form AT-1(original) is to be sent to the following address:
Attention: Environmental Sciences Branch
North Carolina Division of
Environmental Management
4401 Reedy Creek Road
Raleigh, N.C. 27607
Test data shall be complete and accurate and include all supporting chemical/physical measurements performed in
association with the toxicity tests, as well as all dose/response data. Total residual chlorine of the effluent toxicity
sample must be measured and reported if chlorine is employed for disinfection of the waste stream.
Should any single quarterly monitoring indicate a failure to meet specified limits, then monthly monitoring will
begin immediately until such time that a single test is passed. Upon passing, this monthly test requirement will
revert to quarterly in the months specified above.
Should any test data from this monitoring requirement or tests performed by the North Carolina Division of
Environmental Management indicate potential impacts to the receiving stream, this permit may be re -opened and
modified to include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control organism
survival and appropriate environmental controls, shall constitute an invalid test and will require immediate
retesting(within 30 days of initial monitoring event). Failure to submit suitable test results will constitute
noncompliance with monitoring requirements.
7Q10 1.7 cfs
Permitted Flow 6.0 MGD
IWC 85 %
Basin & Sub -basin CTB33
Receiving Stream McDowell Creek
County Mecklenburg
QCL PIF Version 9191

TOXICANT ANALYSIS
Facility Name
CMUD-McDowellCrWWTP
NPDES #
NC0036277 '•
Ow MGD
6i
7Q10s (cfs)
1.71
/WC %
84.55i
Rec'ving Stream
McDowell Creek i
Stream Class
WS-III ••
FINAL RESULTS
Cadmium
i
Max. Prod Cw
7juGO
Allowable Cw
2.41ugA
Max. Value
5
Nickel
Max. Prod Cw
19.5': ugA
Allowable Cw
104.1 j ugA
Max. Value
15
Lead
Max. Pred Cw
32.4':u
Allowable Cw
29.61ugA
Max. Value
24
Cyanide
'
Max. Pred Cw
6.8i:UgA
Allowable Cw
5.9ugA
Max. Value
4
Fluoride
'
Max. Pred Cw
979?ugA
Allowable Cw
Max. Value
Chromium
Max. Prod Cw
121,15jugA
Allowable Cw
Max. Value
Co er
Max. Pred Cw
481ugA
Allowable Cw
8.3:'ugA
Max. Value
32;
Zinc
I
Max. Pred Cw
199.51ugA
Allowable Cw
59.1': ugA
Max. Value
133'
Chloride
Max. Prod Cw
35200iugA
Allowable Cw
295698.9':u
Max. Value
320001
Silver
i
Max. Pred Cw
ugA
Allowable Cw
0.1; ugA
Max. Value
151
Arsenic
'
Max. Prod Cwl
8.51 ugA
Allowable Cwl
59.11 ugA
N, ,,1--ry
G;M r t
(4:Tr �Y Mrll•
;1 Q:p I)r (.TMi'
M wIRZK.
9grz„u- f
m�i .4
p��
Rod w LTNP
616/95 PAGE 1

TOXICANT ANALYSIS
Max. Value
5i
Mercury
Max. Pred Cw
jl.7,ugAAllowable
Cw
Value5
01 ugA.._.._.._.._.._.._.._.._.._.._.._....Max.
LL(M(T
t rf �w+�l1/vi
6/6/95 PAGE

0
CMUD•MCDOWELL CR WWTP
Residual Chlorine
Ammonia as NH3
(summer)
7Q10 (CFS)
1.7
7010 (CFS)
1.7
DESIGN FLOW (MGD)
6
DESIGN FLOW (MGD)
6
DESIGN FLOW (CFS)
9.3
DESIGN FLOW (CFS)
9.3
STREAM STD (UG/L)
17.0
STREAM STD (MG/L)
1.0
UPS BACKGROUND LEVEL (UG/L)
0
UPS BACKGROUND LEVEL (MG/L)
0.22
IWC (%)
84.65
IWC (%)
84.55
Allowable Concentration (ug/i)
20.11
Allowable Concentration (mg/l)
1.14
Ammonia as NH3
(winter)
7010 (CFS)
4.2
Fecal Limit 200/100ml DESIGN FLOW (MGD)
6
Ratio of 0.2:1 DESIGN FLOW (CFS)
9.3
STREAM STD (MGIL)
1.8
UPS BACKGROUND LEVEL (MG/L)
0.22
IWC (%)
68.89
Allowable Concentration (mg/1)
2.51
6/6195