NC0081621_Permit Modification_19960801

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
August 1, 1996
Mr. Charles Machado
Operator in Responsible Charge
Water & Sewer Authority of Cabarrus County
Post Office Box 428
Concord, NC 28026-0428
Subject: NPDES Permit Modification
Permit Number NCO081621
Muddy Creek Wastewater Treatment Plant
Cabarrus County
Dear Mr. Machado:
The Division of Water Quality acknowledges receipt of the following information:
• Permit modification request to drop the total residual chlorine monitoring requirement.
• Permit modification fee of $100.00 (Check Number 10122).
On September 23, 1994, the Division of Water Quality issued an Authorization to Construct a wastewater
treatment plant to the subject facility. The authorization granted construction of a raw sewage pump
station, force main, splitter box, bar screen, equalization basin, aeration basins, secondary clarifiers,
return sludge pumps, effluent filters, ultra -violet light disinfection, cascade aerator, effluent monitoring
box, sludge digester, and sludge holding tank.
Due to the fact the subject facility does not use chlorine for disinfection, the Division agrees to drop the
monitoring requirement for total residual chlorine. The attached effluent sheets have been modified to
reflect this change. Please replace the existing sheets with the enclosed effluent sheets. This modification
becomes effective on September 1, 1996.
All other terms and conditions in the original permit remain unchanged and in full effect. This
modification is issued pursuant to the requirements of North Carolina General Statute 143-215.1 and the
Memorandum of Agreement between North Carolina and the U.S. Environmental Protection Agency dated
December 6, 1983.
If you have any questions concerning this permit, please contact Jeff Myhra at telephone number (919)
733-5083, extension 597.
Scerely,
i
Preston Howar , Jr.,. P.E.
cc: Central Files
Mooresville Regional Office, Water Quality Section
Permits and Engineering Unit
Facilities Assessment Unit (No BP)
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

A. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS SUMMER (April 1 - October 31)
Permit No. NC0081621
During the period beginning on the effective date of the permit and lasting until expansion above 0.075 MGD, 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
LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Weekly
Avera a
Daily
Maximum
Measurement
Fre uency
Sample
IyRe
Sample
Location'
Flow
0.075 MGD
Continuous
Recording
I or E
BOD, 5 day, 20°C2
10.0 m /I
15.0 m /I
3 / Week
Composite
E, I
Total Suspended Residue 2
30.0 m /I
45.0 m /I
3 / Week
Composite
E, I
NH3 as N
4.0 mg/I
3 / Week
Composite
E
Dissolved Oxygen
3 / Week
Grab
E, U, D
H4
3 / Week
Grab
E
Fecal Coliform(geometric mean
200/100 ml
400/100 ml
3 / Week
Grab
E, U, D
Total Residual Chlorines
28.0 /I
3 / Week
Grab
E
Temperature, °C
3 / Week
Grab
E U D
Conductivity
See Notes'
Grab
U, D
Notes:
' Sample locations: E - Effluent, I - Influent, U - Upstream (200 feet from outfall), D - Downstream (at SR 1140). 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.
2 The monthly average effluent BODs and Total Suspended Residue concentrations shall not exceed 15% of the respective influent values (85% removal).
3 The daily average dissolved oxygen effluent concentration shall not be less than 5.0 mg/I.
4 The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
s Monitoring requirements only apply if chlorine is added for disinfection.
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. NCO081621
During the period beginning on the effective date of the permit and lasting until expansion above 0.075 MGD, 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
LIMITS
MONITORING REQUIREMENTS
Monthly
Avera a
Weekly
Average
Daily
Maximum
Measurement
Frequency
ple
[Ltp e
Sample
Location'
Flow
0.075 MGD
Continuous
Recording
I or E
BOD, 5 day, 20°C2
20.0 m /I
30.0 m /I
3 / Week
Composite
E, I
Total Suspended Residue2
30.0 mg/1
45.0 m /I
3 / Week
Composite
E, I
NH3 as N
8.0 mg/I
3 / Week
Composite
E
Dissolved Oxygen3
H4
3 / Week
3 / Week
Grab
Grab
E, U, D
E
Fecal Coliform(geometric mean
2001100 ml
400/100 ml
3 / Week
Grab
E, U, D
Total Residual Chlorines
28.0 /1
3 / Week
Grab
E
Temperature, °C
3 / Week
Grab
E U D
Conductivity
See Notes'
Grab
U, D
Notes:
' Sample locations: E - Effluent, I - Influent, U - Upstream (200 feet from outfall), D - Downstream (at SR 1140). 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.
2 The monthly average effluent BODs and Total Suspended Residue concentrations shall not exceed 15% of the respective influent values (85% removal).
3 The daily average dissolved oxygen effluent concentration shall not be less than 5.0 mg/I.
4 The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
5 Monitoring requirements only apply if chlorine is added for disinfection.
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. NCO081621
During the period beginning after expansion above 0.075 MGD and lasting until expansion above 0.150 MGD, 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
LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Weekly
Average
Daily
Maximum
Measurement
Frequency
Sample
TyR±
Sample
Location'
Flow
0.150 MGD
Continuous
Recording
I or E
BOD, 5 day, 20°C2
10.0 m /I
15.0 m /I
3 / Week
Composite
E, I
Total Suspended Residue2
30.0 m /I
45.0 m /I
3 / Week
Composite
E, I
NH3 as N
4.0 mg/I
3 / Week
Composite
E
Dissolved Oxygen3
3 / Week
Grab
E, U, D
H4
3 / Week
Grab
E
Fecal Coliform(geometric mean
200/100 ml
400/100 ml
3 / Week
Grab
E, U, D
Total Residual Chlorines
28.0 /I
3 / Week
Grab
E
em erature, °C
3 / Week
Grab
E UD
Fonductivit
See Notes'
Grab
U, D
Notes:
' Sample locations: E - Effluent, I - Influent, U - Upstream (200 feet from outfall), D - Downstream (at SR 1140). 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.
2 The monthly average effluent BOD5 and Total Suspended Residue concentrations shall not exceed 15% of the respective influent values (85% removal).
3 The daily average dissolved oxygen effluent concentration shall not be less than 5.0 mg/I.
4 The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
s Monitoring requirements only apply if chlorine is added for disinfection.
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. NCO081621
During the period beginning after expansion above 0.075 MGD and lasting until expansion above 0.150 MGD, 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
LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Weekly
Average
Daily
Maximum
Measurement
Fre uenc
Sample
Type
Sample
Location'
Flow
0.150 MGD
Continuous
Recording
I or E
BOD, 5 day, 20°C2
20.0 m /I
30.0 m /I
3 / Week
Composite
E 1
Total Suspended Residue2
30.0 m /I
45.0 m /I
3 / Week
Composite
E,
NH3 as N
8.0 mg/I
3 / Week
Composite
E
Dissolved Oxygen3
H4
3 / Week
3 / Week
Grab
Grab
E, U, D
E
Fecal Coliform(geometric mean
200/100 ml
400/100 ml
3 / Week
Grab
E, U, D
Total Residual Chlorines
28.0 /I
3 / Week
Grab
E
Temperature, °C
3 / Week
Grab
E U D
Conductivity
See Notes'
Grab
U, D
Notes:
' Sample locations: E - Effluent, I - Influent, U - Upstream (200 feet from outfall), D - Downstream (at SR 1140). 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.
2 The monthly average effluent BODs and Total Suspended Residue concentrations shall not exceed 15% of the respective influent values (85% removal).
3 The daily average dissolved oxygen effluent concentration shall not be less than 5.0 mg/I.
4 The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
s Monitoring requirements only apply if chlorine is added for disinfection.
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. NC0081621
During the period beginning after expansion above 0.150 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
LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Weekly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Location'
Flow
0.30 MGD
Continuous
Recording
I or E
BOD, 5 da , 20°C2
10.0 m /I
15.0 m /I
3 / Week
Composite
E 1
Total Suspended Residue2
30.0 m /I
45.0 m /I
3 / Week
Composite
E, I
NH3 as N
4.0 mg/I
3 / Week
Composite
E
Dissolved Oxygen3
3 / Week
Grab
E, U, D
H4
3 / Week
Grab
E
Fecal Coliform(geometric mean
200/100 ml
400/100 ml
3 / Week
Grab
E, U, D
Total Residual Chlorines
28.0 /I
3 / Week
Grab
E
Temperature, °C
3 / Week
Grab
E U D
Conductivity
See Notes'
Grab
U, D
Notes:
' Sample locations: E - Effluent, I - Influent, U - Upstream (200 feet from outfall), D - Downstream (at SR 1140). 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.
2 The monthly average effluent BOD5 and Total Suspended Residue concentrations shall not exceed 15% of the respective influent values (85% removal).
3 The daily average dissolved oxygen effluent concentration shall not be less than 5.0 mg/I.
4 The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
5 Monitoring requirements only apply if chlorine is added for disinfection.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

A. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS WINTER (November - March 31) Permit No. NC0081621
During the period beginning after expansion above 0.150 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
LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Weekly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Location'
Flow
0.30 MGD
Continuous
Recording
I or E
BOD, 5 day, 20OC2
20.0 m /I
15.0 m /I
3 / Week
Composite
E I
Total Suspended Residue2
30.0 m /I
45.0 m /I
3 / Week
Composite
E, I
NH3 as N
8.0 mg/I
3 / Week
Composite
E
Dissolved Oxygen3
H4
3 / Week
3 / Week
Grab
Grab
E, U, D
E
Fecal Coliform(geometric mean
200/100 ml
400/100 ml
3 / Week
Grab
E, U, D
Total Residual Chlorines
28.0 /I
3 / Week
Grab
E
Temper ture, °C
3 / Week
Grab
El U D
Conductivity
See Notes'
Grab
U, D
Notes
' Sample locations: E - Effluent, I - Influent, U - Upstream (200 feet from outfall), D - Downstream (at SR 1140). 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.
2 The monthly average effluent BODs and Total Suspended Residue concentrations shall not exceed 15% of the respective influent values (85% removal).
3 The daily average dissolved oxygen effluent concentration shall not be less than 5.0 mg/I.
4 The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
s Monitoring requirements only apply if chlorine is added for disinfection.
There shall be no discharge of floating solids or visible foam in other than trace amounts.