NC0047597_Permit Modification_19940105

State of North Carolina
Department of Environment;
Health and Natural Resources
Division of Environmental Management
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary
A. Preston Howard, Jr., P.E., Director
Mr. A. T. Rolan
City of Durham
Department of Water Resources
101 City Hall Plaza
Durham, NC 27701
Dear Mr. Rolan:
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January 5, 1994
Subject: Permit Modification
Permit No. NC0047597
Farrington Road WWTP
Durham County
On March 10, 1993 the Division of Environmental Management forwarded modifications to
the subject permit. Unfortunately, Chlorophyll A was omitted from the effluent sheet in Part I.
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Please find the enclosed ,,,mended effluent pages which should be inserted into your
permit. The old pages should be discarded. 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
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 demand is made, this decision shall be final and binding.
If you have any questions concerning this revision, please contact Jay Lucas at telephone
number 919/733-5083.
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P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX 919Ii�96F!L1-S
An Equal Opportunity Affirmative Action Employer 50% recycled/ 10% post -consumer paper

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A. ()..EFILUENT LIMITATIONS AND MONITORING REQUIREMENTS SUMMER (April 1- October 31) Permit No. NC0047597
During the period beginning on the effective date f 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 perinittee as specified below:
Effluent Characteristics Discharge Limitations
Monthly Avg.
Flow 20.0 MGD
BOD, 5 day, 20°C** 5.0 m g / I
Total Suspended Residue** 30.0 mg/I
NH3 as N 1.0 mg/I
Dissolved Oxygen****
Fecal Coliform (geometric mean)
Total Residual Chlorine
Temperature
Total Nitrogen (NO2 + NO3 + TKN)
Total Phosphorus*******
Chronic Toxicity
* Sample locations: E - Effluent; I - Influent
Weekly Avg, Daily Max
7.5 mg/I
45.0 mg/I
1.5 mg/I
200.0 /100 ml 400.0 /100 ml
0.5 mg/1
Monitoring
Measurement
Frequency
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
I or E
E, I
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/1.
***** Chronic Toxicity (Ceriodaphnia) P/F at 99%; January, April, July and October, See Part III, Condition F.
art III, Condition G.
pliance shall be based upon a quarterly average of weekly samples.
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.
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. 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 Characteristics Discharge Limitations Monitoring Requirements
Units (specify) Measurement Sample . *Sample
Monthly Avg.,, Weekly Avg, Daily Max Frequency Type Location
Pollutant Analysis ' Annually E
Conductivity * * * Grab * *
Cadmium 2.0 ug/I 4.5 ug/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 * * *
Total Phosphorus Weekly Grab * * *
NH3 as N Weekly Grab * * *
Chlorophyll A 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 Characteristics Discharge Limitations Monitoring
,Measurement
Monthly Avg, Weekly Avg.
Flow 20.0 M D
BOD, 5 day, 20°C** 7.0 mg/I 10.5 mg/I
Total Suspended Residue** 30.0 m g/ I 45.0 m g/ I
NH3 as N 2.0 mg/I 3.0 mg/I
Dissolved Oxygen****
Fecal Coliform (geometric mean) 200.0 /100 mit.
Total Residual Chlorine
Temperature
Total Nitrogen (NO2 + NO3 + TKN)
Total Phosphorus 2.0 mg/I
Chronic Toxicity*****
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400.0 /100 ml
Daily Max
Frequency
Continuous
Daily
Daily
Daily
Daily
Daily
17.0 ug/I Daily
Daily
Monthly
Weekly
Quarterly
Requirements
Sample
Type
Recording
Composite
Composite
Composite
Grab
Grab
Grab
Grab
Composite E
Composite E
Composite E
*Sample
Location
1 or E
E, I
E, I
E
E* * *
E***
E
E***
* Sample locations: E - Effluent; I - Influent
** 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.
*** ** ie; Part III, Condition G.
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** *** ' m fiance shall be based upon a quarterlyaverageof we
ekly p p g w ekly sar•Zples.
ThpH 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.
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Thereibil 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. 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 Characteristics
Pollutant Analysis
Conductivity
Cadmium
Chromium
Nickel
Lead
Cyanide
Mercury
Copper
Zinc"
Silver
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Discharge Limitations
Units (speclfyj
Monthly Avg. Weekly Avg, Daily Max
2.0 µg/I
50.0 µg/I
88.0 µg/I
25.0 µg/I
4.5 µg/I
75.0 µg/l
132.0 µg/I
34.5 µg/I
Monitoring
Measurement
Frequency
Annually
Weekly
Weekly
Weekly
Weekly
Weekly
Monthly
Monthly
Monthly
Monthly
Monthly
Requirements
Sample
Type
Grab
Composite
Composite
Composite
Composite
Grab
Composite
Composite
Composite
Composite
*Sample
Location
E
E
E
E
E
E
E
E
E
E
I.
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