NC0081621_Technical Correction_20210611

DocuSign Envelope ID: A048AB34-71B6-488B-86AE-DE5E5B2FD068
ROY COOPER
Governor
JOHN NICHOLSON
Interim Secretary
S. DANIEL SMITH
Director
NORTH CAROLINA
Environmental Quality
June 11, 2021
Mr. Chad VonCannon, Engineering Director
Water and Sewer Authority of Cabarrus County
232 Davidson Highway
Concord, North Carolina 28027
Subject: NPDES Permit Technical Correction
Permit NC0081621
Muddy Creek WWTP
Cabarrus County
Grade II (0.3 MGD) & III (1.0 MGD)
Biological WPCS
SIC Code 4952
Dear Mr. VonCannon:
The Division issued a final permit modification to your facility on May 10, 2021. In response to
the discovery of a missing footnote annotation regarding instream conductivity monitoring, the
footnote annotation has been correctly added in Sections A. (1.) and A. (2.) Effluent Limitations
and Monitoring Requirements of your permit. Accordingly, we hereby forward the modified
permit pages (Pages 4 and 6 of 13) to amend your permit. Please insert the changed pages into
your permit and disregard the old pages.
All other terms and conditions in the original permit remain unchanged and in full effect. These
modifications are issued pursuant to the requirements of North Carolina General Statute 143-215.1
and the Memorandum of Agreement between North Carolina and the U.S. Environmental
Protection Agency dated December 6, 1983.
If any parts, measurement frequencies or sampling requirements contained in this permit are
unacceptable to you, you have the right to an adjudicatory hearing upon written request within
thirty (30) days following receipt of this letter. This request must be in the form of a written
petition, conforming to Chapter 150B of the North Carolina General Statutes, and filed with the
Office of Administrative Hearings (6714 Mail Service Center, Raleigh, North Carolina 27699-
6714). Unless such demand is made, this decision shall be final and binding.
Please note that this permit is not transferable except after notice to the Division. The Division
may require modification or revocation and reissuance of the permit. This permit does not affect
the legal requirements to obtain other permits which may be required by the Division of Water
Resources or any other Federal, State, or Local governmental regulations.
£ D_E
NORTH CAROLINA
Department of Environmental Quality
North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 11617 Mail Service Center I Raleigh, North Carolina 27699-1617
919.707.9000

DocuSign Envelope ID: A048AB34-71B6-488B-86AE-DE5E5B2FD068
If you have any questions concerning this permit, please contact Cassidy Kurtz at [phone]
or via email at [e-mail].
Sincerely,
b/�y�:AA AA'^ �, 1,,���� AA
EDocuSigned
U I uvluk(tb
C464531431644FE...
for S. Daniel Smith, Director
Division of Water Resources, NCDEQ
Hardcopy: NPDES Files
Central Files
Ecopy: US EPA Region 4
DWR/Mooresville Regional Office/Water Quality
Willis Engineers/Charles A. Willis
WWTP ORC/Kimberly Holt
Page 2 of 2

DocuSign Envelope ID: A048AB34-71B6-488B-86AE-DE5E5B2FD068
Permit NC0081621
PARAMETER CHARACTERISTICS
Parameter Code
EFFLUENT LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Weekly
Average
Daily
Maximum
MEASUREMENT
FREQUENCY 2
Sample
Type
Sample
Location 2
Temperature 9 (°C) 00010
Monitor and Report
Variable
Grab
U, D
Conductivity9 (pmhos/cm) 00094
Monitor and Report
Variable
Grab
U, D
Total Hardness [as CaCO3] 00900
(mg/L) 10
Monitor and Report
Quarterly
Grab
U
Footnotes:
1. The Permittee shall submit discharge monitoring reports electronically using the NC DWR's eDMR application system
[See A. (6.)].
2. U: upstream at least 200 feet from the outfall. D: downstream at NCSR 1140. Instream sampling shall consist of grab
samples collected 3/week during June, July, August, and September and weekly during the remainder of the year.
3. The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15% of the respective
influent values (85% removal).
4. 2/week sampling must occur on any two non-consecutive days during the calendar week.
5. Effluent monitoring and limitation only apply if chlorine or a chlorine derivative is added to the waste stream during
treatment. The Division shall consider all effluent TRC values reported below 50 µg/L to be in compliance with the permit.
However, the Permittee shall continue to record and submit all values reported by a North Carolina certified laboratory
(including field certified), even if these values fall below 50 µg/L.
6. Effluent Total Hardness sampling shall be conducted in conjunction with effluent metals for the pretreatment program.
7. Chronic Toxicity (Ceriodaphnia) at 1.2%; quarterly during January, April, July and October [See Special Condition A.
(3•)]•
8. The Permittee shall perform three Effluent Pollutant Scans during the term of this permit [See Section A. (5.)]
9. Instream (U & D) sampling is provisionally waived based on the Permittee's membership in the Yadkin -Pee Dee
River Basin Association (YPDRBA). If at any time during the term of this permit, membership is terminated, the
Permittee shall notify the Division immediately, and immediately conduct instream monitoring as stipulated in this permit.
10. The Permittee shall sample instream hardness upstream of the facility's discharge. The sample shall be representative of
the hardness in the receiving stream.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
DocuSigned by:
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for S. Daniel Smith, Director
Date: June 11, 2021
Page 4 of 13

DocuSign Envelope ID: A048AB34-71B6-488B-86AE-DE5E5B2FD068
Permit NC0081621
PARAMETER CHARACTERISTICS
Parameter Code
EFFLUENT LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Weekly
Average
Daily
Maximum
MEASUREMENT
FREQUENCY 2
Sample
Type
Sample
Location 2
Dissolved Oxygen 9 (mg/L) 00300
Monitor and Report
Variable
Grab
U, D
Temperature 9 (°C) 00010
Monitor and Report
Variable
Grab
U, D
Conductivity 9 (pmhos/cm) 00094
Monitor and Report
Variable
Grab
U, D
Total Hardness [as CaCO3] 00900
(mg/L)10
Monitor and Report
p
QuarterlyGrab
U
Footnotes:
1. The Permittee shall submit discharge monitoring reports electronically using the NC DWR's eDMR application
system [See A. (6.)].
2. U: upstream at least 200 feet from the outfall. D: downstream at NCSR 1140. Instream sampling shall consist of grab
samples collected 3/week during June, July, August, and September and weekly during the remainder of the year.
3. The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15% of the respective
influent values (85% removal).
4. Effluent monitoring and limitation only apply if chlorine or a chlorine derivative is added to the waste stream during
treatment. The Division shall consider all effluent TRC values reported below 50 µg/L to be in compliance with the
permit. However, the Permittee shall continue to record and submit all values reported by a North Carolina certified
laboratory (including field certified), even if these values fall below 50 µg/L.
5 TN = TKN + NO2-N + NO3-N where TN is Total Nitrogen, TKN is Total Kjeldahl Nitrogen, and NO2-N + NO3-N are
Nitrite and Nitrate Nitrogen, respectively.
6. Effluent Total Hardness sampling shall be conducted in conjunction with effluent metals for the pretreatment program.
7. Chronic Toxicity (Ceriodaphnia) at 3.9%; quarterly during January, April, July and October [See Special Condition
A. (3.)].
8. The Permittee shall perform three Effluent Pollutant Scans during the term of this permit [See Section A. (5.)]
9. Instream (U & D) sampling is provisionally waived based on the Permittee's membership in the Yadkin -Pee
Dee River Basin Association (YPDRBA). If at any time during the term of this permit, membership is terminated,
the Permittee shall notify the Division immediately, and immediately conduct instream monitoring as stipulated in
this permit.
10. The Permittee shall sample instream hardness upstream of the facility's discharge. The sample shall be representative
of the hardness in the receiving stream.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
�DocuSigned by:
Attd,w1, ilk6 C btit
'-C464531431644FE...
for S. Daniel Smith, Director
Date: June 11, 2021
Page 6 of 13