NC0024945_Permit Modification_19980615

NPDES DOCUMENT SCANNING COVER SWEET
NPDES Permit:
NC0024945
Irwin Creek WWTP
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
ermit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Owner Name Change
Draft Permit
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
June 15, 1998
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State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary
A. Preston Howard, Jr., P.E., Director
June 15, 1998
Mr. Barry Gullet, Deputy Director
Charlotte -Mecklenburg Utility Department
5100 Brookshire Boulevard
Charlotte, North Carolina 28216
Subject:NPDES Permits Modifications
Permit No. NC0024937 Sugar Creek WWTP
Permit No. NC0024945 Irwin Creek WWTP
Permit No. NC0024970 McAlpine Creek WWTP
Permit No. NC0030210 Mallard Creek WWTP
Mecklenburg County
Dear Mr. Gullet:
The Division of Water Quality received your request for permit modifications on June 1, 1998 for
the above referenced facilities. The permits have been modified per your written request for NPDES
permit modification and modification fee (check #634351, $300). Three minor corrections were also
made to Permit No. NC0030210. The following are the listed changes made to each permit:
Permit No. NC0024937, Sugar Creek WWTP
• The daily maximum requirement for Total Residual Chlorine was changed to a daily average
requirement of 28 will with a weekly average of 19 µg/1.
Permit No. NC0024945, Irwin Creek WWTP
• The daily maximum requirement for Total Residual Chlorine was changed to a daily average
requirement of 28 µg/1 with a weekly average of 21 µg/1.
Permit No. NC0024970, McAlpine Creek WWTP
• The daily maximum requirement for Total Residual Chlorine was changed to a daily average
requirement of 28 µg/1 with a weekly average of 17 µg/1.
The Chronic Toxicity (Ceriodaphnia) P/F at 90% test was changed to a Chronic Toxicity (Phase
II) at 90% test. As was stated on the permit issuance letter for NC0030210, dated Apri127, 1998,
"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." If the facility performs a
quarterly single concentration test at 90% that fails, multiple concentration tests must be run in
the consecutive months of the quarter and the arithmetic average of values will be used to
determine if the chronic limit is met.
Permit No. NC0030210, Mallard Creek WWTP
• The following statement was mistakenly added to the permit issuance letter, dated April 27,
1998. "Added weekly Chromium testing, limited at 53.0 µa/1." Monitoring only is required for
Chromium.
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

NPDES Permit Modifications
Charlotte -Mecklenburg Utility Department
June 15, 1998
Page 2
• The following language was added .as footnote 6 to effluent pages A., B. and C. The detection
limit for mercury is 0.2 µg/1. If the measured levels of mercury are below the detection limit,
then the measurement is considered to be zero for purposes of compliance evaluation and should
be reported on the DMR as < 0.2 µg/1.
• Conductivity measurement was inadvertently added to the outfall 001 effluent discharge. This
has been removed.
• Total Residual Chlorine monitoring was inadvertently removed from the outfall 002 effluent
discharge. It has been added back, although it is still only required if chlorine disinfection is
used.
Please find enclosed amended effluent sheets which should be inserted into the respective
permits. The old effluent pages should be discarded. All other terms and conditions contained in the
original permit remain unchanged and in full effect. This permit modification is issued pursuant to the
requirements of North Carolina General Statutes 143-215.1 and the Memorandum of Agreement
between North Carolina and the U. S. Environmental Protection Agency.
If any parts, measurement frequencies or sampling requirements contained in this permit
modification are unacceptable to you, you have the right to an adjudicatory hearing upon written request
within thirty' (30) days following receipt of this letter. This request must be in the form of a written
petition, conforming to Chapter 150B of the North Carolina General Statutes, and filed with the office of
Administrative Hearings, Post Office Drawer 27447, Raleigh, North Carolina 27611-7447. Unless such
a demand is made, this permit modification shall be final and binding.
If you have any questions, please contact Mary Cabe of my staff at [phone], extension 518.
• Sincerely,
tb,,, F72776'
tfr Preston Howard, Jr., P.E.
Attachments
cc: NPDES Unit
Point Source Compliance / Enforcement Unit
Central Files
Mooresville Regional Office, Water Quality Section
Technical Assistance & Certification Unit
Aquatic Toxicology Unit
Mr. J. Reed Atkinson / CMUD

A. (1). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS Permit No. NC0024945
/ Flow
CBOD, 5-Day, 20°C 2 (April 1 - Oct. 31)
CBOD, 5-Day, 20°C 2 (Nov. 1 - March 31)
✓ Total Suspended Residue 2
NH3 as N (April 1 - October 31)
✓NH3 as N (November 1 - March 31)
Dissolved Oxygen 3
JFecal Coliform (geometric mean)
Total Residual Chlorine
Temperature
Total Nitrogen (NO2 + NO3 + TKN)
f'otal Phosphorus
Chronic Toxicity 4
✓Conductivity
Footnotes:
1 Sample locations: E - Effluent, I - Influent, U - Upstream, D - Downstream. For instream monitoring requirements, see Part III, Condition G.
2 The monthly average effluent CBOD5 and total suspended residue concentrations shall not exceed 15% of the respective influent value.
3 The daily average dissolved oxygen effluent concentrations shall not be less than 6.0 mg/1.
4 Chronic Toxicity (Ceriodaphnia) P/F at 83%. Samples shall be taken quarterly during the months of January, April, July, and October; See Part III,
Condition H.
5 The detection limit for mercury is 0.2 µg/1. If the measured levels of mercury are below the detection limit, then the measurement is considered to
be zero for purposes of compliance evaluation and should be reported on the DMR as < 0.2 41.
The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units and shall be collected at the effluent daily by grab sample.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
During the period beginning on the effective date of the permit and lasting until expiration, the Permittee is authorized to discharge
from outfall(s) serial number 001 or 002. Such discharges shall be limited and monitored by the Permittee as specified below:
Effluent Characteristics Discharge Limitations
Monthly Avg. Weekly Avg.
15.0 MGD
5.0
10.0
30.0
1.0
2.0
mg/1
mg/1
mg/1
mg/1
mg/1
7.5 mg/1
15.0 mg/1
45.0 mg/1
200/100 ml 400/100 ml
21�0 ,i�/l
Requirements
Sample Sample
Type Location 1
Monitoring
Measurement
Daily Avg. Frequency
Continuous
Daily
Daily
Daily
Daily
Daily
Daily
Daily
28.0 mil Daily
Daily
Monthly
Monthly
Quarterly
Daily
Recording
Composite
Composite
Composite
Composite
Composite
Grab
Grab
Grab
Grab
Composite
Composite
Composite
Grab
I or E
E, I
E, I
E, I
E
E
E, U, D
E
E
E, U, D
E
E
E
E,U,D

A. (2). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Continued) Permit No. NC0024945
Effluent Characteristics Discharge Limitations Monitoring Requirements
Measurement Sample gample
Monthly Avg. Weekly Avg. Daily Max. Frequency Type Location 1
ccadmiur ,0141Lr 2.2 µg/1 5.5 11,g/1 Weekly Composite E
V Copper , 2/month Composite E, U, D
CCyg_nid--0—' ��'T'' °'-: 5.5 µg/1 18.0 µg/1 Weekly Grab E
(Lea4 o 28.0 µg/l 38.0 µg/1 Weekly Composite E
`=ercut ?(C�-* 0.015 µg/1 0.06 µg/1 Weekly Composite E
✓ Silver 2/month Composite E
v Zinc 2/month Composite E, U, D
/ L v�G/D `"g. GutcK/t der, / �
Footnotes:
1 Sample locations: E - Effluent, I - Influent, U - Upstream, D - Downstream. For instream monitoring requirements, see Part III, Condition G.
2 The monthly average effluent CBOD5 and total suspended residue concentrations shall not exceed 15% of the respective influent value.
3 The daily average dissolved oxygen effluent concentrations shall not be less than 6.0 mg/l.
4 Chronic Toxicity (Ceriodaphnia) P/F at 83%. Samples shall be taken quarterly during the months of January, April, July, and October; See Part III,
Condition H.
5 The detection limit for mercury is 0.2 µg/1. If the measured levels of mercury are below the detection limit, then the measurement is considered to
be zero for purposes of compliance evaluation and should be reported on the DMR as < 0.2 µg/1.
The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units and shall be collected at the effluent daily by grab sample.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

•
(07)
CHARLOTTE
May 26, 1998
Mary Cabe
NC DENR, Div of Water Quality
P.O. Box 29535
Raleigh, North Carolina 27626-0535
Subject: Minor Permit Modifications
McAlpine Creek NPDES Permit No. NC0024970
Sugar Creek NPDES Permit No. NC0024937
Irwin Creek NPDES Permit No. NC0024945
Dear Mary:
I am sending our check for 8300.00 for minor modifications to the subject NPDES permits. This is per our
conversation last week and stems from our informational request in December 1997.
ttG Y/5/
506Ca
Car
The first modification requested is to change the Total Residual Chlorine (TRC) limit in each of the three permits
above from a Daily Maximum to a Daily Average value. Specifically, each plant would have a maximum Daily
Average concentration limit of 28ug/I. Sampling would be by the "grab" method, with one or more samples collected
daily.
The second modification requested is to change the toxicity testing requirement from the Chronic Toxicity
(Ceriodaphnia) P/F test to the Chronic Toxicity Phase II test at McAlpine Creek only. We request that the Phase II
toxicity test language that is in the recently issued Mallard Creek NPDES permit be used, including an explanation as
in the Mallard Creek permit cover letter that explains that compliance is determined either by passing the quarterly
test, or by passing on the basis of a quarterly arithmetic average of subsequent test values.
Please let me know if you have any questions or need additional information. Thank you for your assistance.
Sincerely,
CHARLOTTE MECKLENBURG UTILITIES
Barry M. ullet, PE
Deputy Director
cc: Kim Neely, McAlpine Creek ORC
Tom Hunter, Irwin Creek ORC
Roy Purgason, Sugar Creek ORC
Myra Zabec, Lab Manager
File
Administration Division 5100 Brookshire Boulevard Charlotte, NC 28216 704/399-2221
Charlotte -Mecklenburg Utility Department

CMUD - TRC daily avg limit
Subject: CMUD - TRC daily avg limit
Date: Wed, 20 May 1998 09:00:46 -0500
From: "Kevin Bowden" <[e-mail]>
To: [e-mail]
Mary, we looked at CMUD's request to have it's daily max TRC limit changed
to daily avg. We don't see any major setbacks as a result of this proposed
modification.
Kevin Bowden
NC DENR - Division of Water Quality
Aquatic Toxicology Unit
4401 Reedy Creek Road
Raleigh, NC 27607
phone: [phone]
fax: [phone]
e-mail: [e-mail]
1 of 1 5/20/98 9:30 AM

State of North Carolina
Department of Environment,
Health and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary
A. Preston Howard, Jr., P.E., Director
November 4, 1996
Mr. J. Reed Atkinson, Superintendent
Charlotte -Mecklenburg Utility Department
5100 Brookshire Boulevard
Charlotte, North Carolina 28216
�EHNF
Subject: NPDES Permit Modifications
Permit No. NC0024937
Sugar Creek WWTP
Permit No. NC00249457
Irwin Creek WWTP
Permit No. NC0024970
McAlpine Creek WWTP
Mecklenburg County
Dear Mr. Atkinson:
This letter responds to a conversation between Halmuth Jansen (CMUD) and Paul Clark of our
staff on October 30, 1996. Mr. Jansen noted that no parameters were to be monitored at one of the
instream monitoring stations (LSC3). Paul Clark rechecked the permit files and confirmed that an error
had been made on the instream monitoring requirements sheet. Dissolved oxygen, conductivity, and
temperature are to be monitored at station LSC3. Corrected versions of the instream monitoring
requirements sheet are included for each of the three referenced permits.
Please find enclosed the modified section of the permit referenced in the preceding paragraph.
Replace the original section in your permit with the newer enclosed section and discard the original
section. All other terms and conditions contained in the original permit remain unchanged and in full
effect. These permit modifications are issued pursuant to the requirements of North Carolina General
Statutes 143-215.1 and the Memorandum of Agreement between North Carolina and the U.S.
Environmental Protection Agency.
If any parts, measurement frequencies or sampling requirements contained in this permit
modification are unacceptable to you, you have the right to an adjudicatory hearing upon written request
within thirty (30) days following receipt of this letter. This request must be in the form of a written
petition, conforming to Chapter 150B of the North Carolina General Statutes, an 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 note that a signed copy of the Irwin Creek WWTP permit cover sheet is also included with
this letter. If you need an original signed copy, please contact us.
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

Mr. Atkinson
November 4, 1996
Page 2
If you have any questions, please contact Paul B. Clark at [phone] extension 580.
Sincerely,
41-A. Preston Howard; Jr., P.E.
Enclosures
cc: Central Files
Mooresville Regional Office, Water Quality Section
Roosevelt Childress, EPA
Permits and Engineering Unit (Permit Files)/
Facility Assessment Unit

Permit No. NC0024945
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT, HEALTH, AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provision of North Carolina General Statute 143-215.1, other lawful standards
and regulations promulgated and adopted by the North Carolina Environmental Management
Commission, and the Federal Water Pollution Control Act, as amended,
City of Charlotte
is hereby authorized to discharge wastewater from a facility located at the
Irwin Creek WWTP
4000 Westmont Drive
Charlotte
Mecklenburg County
to receiving waters designated as Irwin Creek in the Catawba River Basin
in accordance with effluent limitations, monitoring requirements, slid other conditions set forth in Parts I,
II, III, and IV hereof.
The permit shall become effective November 1,1996.
This permit and the authorization to discharge shall expire at midnight on August 31, 2001.
Signed this day September 30, 1996.
Preston Howard, Jr., P - Director
Division of Water Quality
By Authority of the Environmental Mangeibent Commission

t
Part III
G. INSTREAM MONITORING REQUIREMENTS
PARAMETERS TO BE SAMPLED
Parameter
Freauenc
T
Permit No. NC0024945
Location
Dissolved Oxygen
3/wk (Jun -Sep), 1/month (Oct -May)
Grab
IC1, SC1, SC2, SC3, SC4,
SC5, LSC1, LSC3, MCI,
MC2
Temperature
3/wk (Jun -Sep), 1/month (Oct -May)
Grab
ICI, SC1, SC2, SC3, SC4,
SC5, LSC1, LSC3, MC1,
MC2
Conductivity
_
3/wk (Jun -Sep), 1/month (Oct -May)
Grab
IC1, SC1, SC2, SC3, SC4,
SC5, LSC1, LSC3, MCI,
MC2
pH
3/wk (Jun -Sep), 1/month (Oct -May)
Grab
SC5
Ammonia (NH3)
Weekly (Jan -Dec)
Grab
SC5
Nitrate/Nitrite (NOX)
Weekly (Jan -Dec)
Grab
SC5
Total Kjeldahl Nitrogen
(TKN)
Weekly (Jan -Dec)
Grab
SC5
Total Phosphorus (TP)
Weekly (Jan -Dec)
Grab
SC5
Orthophosphate (PO4)
Weekly (Jan -Dec)
Grab
SC5 _ .-- y
Copper
1/month (Jan -Dec)
.,
Grab
IC1,(LSCI, LSC7.j
SC�
MCI, MC2, (.3
Cadmium
1/month (Jan -Dec)
Grab
MCI, MC2
Zinc
1/month (Jan -Dec)
Grab
IC1, SC l;_LSC 1, LSCG,
MC 1, MC2, 3
SAMPLE LOCATIONS
?52'/
Irwin Creek
1. Upstream of Irwin Creek WWTP (IC1).
Sugar Creek
1. Downstream of Irwin and Sugar creeks confluence at Yorkmont Road (SC1).
2. Downstream of Irwin and Sugar creeks confluence at Arrowwood Road (SC2).
3. Downstream of Irwin and Sugar creeks confluence at Nations Ford Road (SC3).
4. Downstream of Irwin and Sugar creeks confluence at Route 51 (SC4).
5. Downstream of McAlpine and Sugar creeks confluence at Route 160 (SC5).
Little Sugar Creek
1. Upstream of Sugar Creek WWTP (LSC1).
2. Downstream of Sugar Creek WWTP at Archdale Road (LSC2).
3. Downstream of Sugar Creek WWTP at Route 521 (LSC3).
McAlpine Creek
1. Upstream of Discharge (MC 1).
2. Downstream of McMullen and McAlpine creeks confluence at SC2964 (MC2).
Upstream and downstream samples shall be grab samples. Instream sampling should continue to be coordinated to
reduce redundant sampling for the CMUD-McAlpine, Sugar Creek, and Irwin wastewater treatment facilities. It is '
recommended that monitoring be conducted during the same day or on consecutive days.
Instream monitoring requirements for Irwin Creek, Sugar Creek, and McAlpine Creek WWTPs are identical. All
instream monitoring data will be submitted with the DMR data for McAlpine Creek WWTP. Please refer to
McAlpine Creek WWTP DMR data for any instream monitoring data pertaining to Irwin Creek, Sugar Creek,
and/or McAlpine Creek WWTPs.