NC0047597_Permit Modification_19930310

State of North Carolina
Department of Environment, Health and Natural Resources
Division of Environmental Management
512 North Salisbury Street • Raleigh, North Carolina 27604
James B. Hunt, Jr., Governor Jonathan B. Howes, Secretary.
March 10, 1993
Mr. A.T. Rolan, Director
Department of Water Resources
City of Durham
101 City Hall Plaza
Durham, NC 27701
Subject: Permit Modification
NPDES Permit No. NC0047597
Farrington Road WWTP
Durham County
Dear Mr. Rolan:
In accordance with a request received on March 4, 1992, we are forwarding herewith
modifications to the subject permit. These modifications are as follows: instream monitoring
requirements have been modified to reflect the changes described in the January 13, 1992 letter from
the Division of Environmental Management concerning instream monitoring requirements for the
Farrington Road WWTP (NC0047597), the Eno River WWTP (NC0026336), the Little Lick Creek
WWTP (NC0026310) and the Northside WWTP (NC0023841). Attached are the revised permit
effluent pages and an additional Part III, Special Conditions page which reflect the requested
changes. These pages should be inserted into your permit and the old corresponding effluent pages
should be discarded.
All other terms and conditions contained 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, you have the right to an adjudicatory hearing upon written request within thirty
Regional Offices
Asheville Fayetteville Mooresville Raleigh Washington Wilmington Winston -Salem
704/251-6208 919/486-1541 704/66= -1699 919/571-4700 919/946-6481 919/395-3900 919/896-7007
Pollution Prevention Pays
P.O. Box 29535, Raleigh, Norte Carolina 27626-0535 Telephone [phone]
An Equal Opponunity Affirmative Action Employer
•

Page Two
Mr. Rolan
(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.
If you have any questions concerning this permit, please contact Charles M. Lowe at
telephone number [phone].
Sincerely,
'Preston Howard, Jr., P.E.
Acting Director
cc: Mr. Jim Patrick, EPA
Raleigh Regional Ofice
.CentralsFiles
Compliance

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A. (). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS SUMMER (April 1 - October 31) Permit No. NC0047597
During the period beginning on the effective date of the permit and listing until expiration, the Permittee is authorized to discharge from outfall
serial number 001. Such discharges shall be limited and monitored by the permittee as specified below:
Effluent Characteristic. Discharge Llmitationl Monitoring
Measurement
Monthly Avg
Flow 20.0 MCD
BOD, 5 day, 20°C** 5.0 mg/I
Total Suspended Residue** 30.0 mg/I
NH3asN 1.0 mg/1
Dissolved Oxygen****
Fecal Coliform (geometric mean) 200.0 /100 ml
Total Residual Chlorine
Temperature
Total Nitrogen (NO2 + NO3 + TKN)
Total Phosphorus* 0.5 mg/I
Chronic Toxicity
* Sample locations: E - Effluent; I - Influent
Weekly Avq. Daily Max
7.5 mg/I
45.0 mg/I
1.5 mg/1
400.0 /100 ml
Freauency
Continuous
Daily
Daily
Daily
Daily
Daily
17.0 ug/I Daily
Daily
Monthly
Weekly
Quarterly
Requirements
Sample
Tvpe
Recording
Composite
Composite
Composite
Grab
Grab
Grab
Grab
Composite
Composite
Composite
*Sample
Location
1 or E
E, 1
E, I
E***
E***
E***
E
E***
E* * *
E***
E
** The monthly average effluent BOD5 and Total Suspended Residue concentrations shall not exceed 15% of the respective influent value
(85%) removal.
*** See Part III, Condition J, for instream monitoring requirements.
**** The daily average dissolved oxygen effluent concentration shall not be less than 6.0 mg/l.
***** Chronic Toxicity (Ceriodaphnia) P/F at 99%; January, April, July and October, See Part III, Condition F.
****** See Part III, Condition G.
******* Compliance shall be based upon a quarterly average of weekly samples.
The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units and shall be monitored as specified in Part III, Condition J.
• There shall be no discharge of floating solids or visible foam in other than trace amounts.
•

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A. ( ). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS SUMMER (April 1 - October 31) Permit No. NC0047597
During the period beginning on the effective date of the permit and lasting until expiration, the Permittee is authorized to discharge from outfall
serial number 001. (Continued)
Effluent Characteristic. Discharge Limitations Monitoring Requirement_
Units (specify Measurement Sample *Sa m D I Q
Monthly Avg Weekly Avq. Daily Max Frequency Type Location
Pollutant Analysis Annually E
Conductivity * * * Grab * *
Cadmium 2.0 u g i l 4.5 u g/ I Weekly Composite E
Chromium 50.0 ug/I 75.0 ug/I Weekly Composite E
Nickel 88.0 ug/I 132.0 ug/I Weekly Composite E
Lead 25.0 ug/I 34.5 ug/I Weekly Composite E
Cyanide Monthly Grab E
Mercury Monthly Composite E
Copper Monthly Composite E
Zinc Monthly Composite E
Silver Monthly Composite E
PO4 Weekly Grab * * *
TKN Weekly Grab * * *
NO2+NO3 Weekly Grab * * •
Total Phosphorus Weekly Grab * * •
NH3 as N Weekly Grab .. *

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A. ( ). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS WINTER (November 1 - March 31) Permit No. NC0047597
During the period beginning on the effective date of the permit and lasting until expiration, the Permittee is authorized to discharge from outfall
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 Avq. Daily Max
20.0MGD
7.0 mg/I 10.5 mg/I
30.0 mg/l 45.0 mg/I
2.0 mg/I 3.0 mg/I
200.0 /100 ml 400.0 /100 ml
2.0 mg/I
* Sample locations: E - Effluent I - Influent
17.0 ug/I
Monitoring
Measurement
Frequency
Continuous
Daily
Daily
Daily
Daily
Daily
Daily
Daily
Monthly
Weekly
Quarterly
Requirement;
Sample
Type
Recording
Composite
Composite
Composite
Grab
Grab
Grab
Grab
Composite
Composite
Composite
*Sample
Location
I or E
E, 1
E, 1
E
E*'*
E***
E
E***
E
E
E
** The monthly average effluent BOD5 and Total Suspended Residue concentrations shall not exceed 15% of the respective influent value
(85%) removal.
*** See Part III, Condition J, for instream monitoring requirements.
**** The daily average dissolved oxygen effluent concentration shall not be less than 6.0 mg/l.
***** Chronic Toxicity (Ceriodaphnia) P/F at 99%; January, April, July and October, See Part III, Condition F.
****** See Part III, Condition G.
******* Compliance shall be based upon a quarterly average of weekly samples.
The pI shall not be less than 6.0 standard units nor greater than 9.0 standard units and shall be monitored as specified in Part III, Condition J.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
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A. (). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS WINTER (November 1 - March 31) Permit No. NC0047597
During the period beginning on the effective date of the permit and lasting until expiration, the Permittee is authorized to discharge from outfall
serial number 001. (Continued)
Effluent Characteristic.
Pollutant Analysis
Conductivity
Cadmium
Chromium
Nickel
Lead
Cyanide
Mercury
Copper
Zinc
Silver
Discharge Limitation:
UP its (specify
Monthly Avg Weekly Avg. Daily Max
2.0 p.g/I
50.0 µg/I
88.0 µg/I
25.0 p.g/I
4.5 p.g/I
75.0 µg/I
132.0 p.g/I
34.5 µg/I
f
Monitoring
Measurement
Frequency
Annually
Weekly
Weekly
Weekly
Weekly
Weekly
Monthly
Monthly
Monthly
Monthly
Monthly
Requirement$
Sample
Typo
*Sample
Location
E
Grab
Composite E
Composite E
Composite E
Composite E
Grab E
Composite E
Composite E
Composite E
Composite E
•

Part III
Permit No: NC0047597
J. INSTREAM MONITORING REQUIREMENTS
June through September
Sites: U1, D2
PARAMETER
FREQUENCY
SAMPLE TYPE
LOCATION
DO
3/Week
Grab
i
U,, D,
Fecal Coliform
3/Week
Grab
U,, D2
Temperature
3/Week
Grab
U,, D2
pH
3/Week
Grab
U1, D2
Conductivity
3/Week
Grab
U,, D2 1
June through September
Site D1
PARAMETER
FREQUENCY
SAMPLE TYPE
LOCATION
DO
Weekly
Grab
D,
Fecal Coliform
Weekly
Grab
D,
Temperature
Weekly
Grab
D,
pH
Weekly
Grab
D,
Conductivity
Weekly _
Grab
D,
June through September
Site: D3
PARAMETER
FREQUENCY
SAMPLING TIME
SAMPLE TYPE
DO
Weekly
1:00-5:00 pm
Grab
Temperature
Weekly
1:00-5:00pm
Grab
pH
Weekly
1:00-5:00 pm
Grab
Conductivity
Weekly
1:00-5:00pm
Grab
Total Phosphorus
Weekly
1:00-5:00 pm
Grab
Total Nitrogen
Weekly
1:00-5:00pm
Grab
NHS-N
Weekly
1:00-5:00 pm
Grab
TKN
Weekly
1:00-5:00 pm
Grab
POa
Weekly
1:00-5:00 pm
Grab
Chlorophyll A
Weekly
1:00-5:00 pm
Grab

October through May
Sites: U,, D2
PARAMETER
FREQUENCY
SAMPLE TYPE
LOCATION
DO
Weekly
Grab
Ul, D2
Fecal Coliform
Weekly
Grab
U,, D2
Temperature
Weekly
Grab
U,, D2
pH
Weekly
Grab
U,, D2
Conductivity
Weekly
Grab
U,, DZ
Instream Monitoring Station Locations:
U, = New Hope Creek at I-40
D, = Above channelized stream above the pond near NCSR 1107. If this is inaccessible it should be noted
on the DMR.
D2 = At NCSR 1107
D3 = Approximately 5 miles below the discharge
Remarks:
Sampling for DO, temperature, pH, Total Phosphorus, Total Nitrogen, NH3-N, TKN, PO4 and
Chlorophyll A should be performed at each required location on the same date.