NC0047597_Wasteload Allocation_19910322

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State of North Carolina
Department of Environment, Health and Natural Resources
Division of Environmental Management
512 North Salisbury Street • Raleigh, North Carolina 27611
James G. Martin, Governor
William W. Cobey, Jr., Secretary
March 22, 1991
Mr. A. T. Roland, Director
Department of Water Resources
City of Durham
101 City Hall Plaza
Durham, NC 27701
George T. Everett,Ph.D.
Director
AMR 2 6 1991
51.1E t trlj BRANCH
Subject: NPDES Permit No. NC0047597
Farrington Road WWTP
Durham County
Dear Mr. Roland:
Staff of the Division's Water Quality Section has reviewed your comments regarding the NPDES
Permit issued February 7, 1991.
The following explanations are offered in response to your concerns:
Biological Oxygen Demand - According to our Laboratory Section, the accuracy of this
analysis should be to two (2) significant figures. The City of Durham may r6port the data in
whole numbers such as 5 or 7, however we will continue to enter this date onto our computer
database as 5.0 and 7.0, respectively.
Total Phosphorus - As you are aware, the Level C modeling analysis we conducted in
response to the City's request in 1989 to expand the facility clearly documented the need for a
more stringent, localized effluent limitation for phosphorus. The permit limit of 0.5 mg/1-
shall remain. In response to your concerns regarding the quarterly limit calculation, Part
II-A(6)(g) sets forth the definition of the quarters and these periods will be utilized for
compliance determinations.
Pollution Prevention Pays
P.O. Box 27687, Raleigh, North Carolina 27611-7687 Telephone [phone]
An Equal Opportunity Affirmative Action Employer

Mr. A. T. Roland
Page 2
March 20, 1991
Chromium, Nickel, Cadmium and Lead - A review of the analytical data supports a reduction
in monitoring frequencies. However, since allocated metal loadings to industrial users
served by the Farrington Road WWTP exceed ten percent of those levels necessary to exceed
the waters quality standard of the receiving waters, we must keep the effluent limits for these
parameters . The monitoring frequeny for Chromium and Nickel will be reduced from daily
to monthly. The monitoring frequency for Cadium and Lead will be reduced from daily
to weekly. Attached you will find revised effluent sheets that you should insert into your
NPDES permit.
Long Term Monitoring - We agree that the previously submitted Long Term Monitoring Plan
is acceptable and fulfills the requirements of this permit condition. Please be aware that the
Division will need to notified of any modifications to this plan during the life of this permit.
Your assumption that the JOC supersedes the NPDES Permit is correct relative to the parameters
and terms addressed by the Order. Hopefully, our letter of March 7, 1991, addressed the topic of
sludge removal and toxicity.
If any parts, requirements, or limitations contained in this permit modification are unacceptable to
you, you have the right to request an adjudicatory hearing upon written request within 30 days
following receipt of this permit. This request must be in the form of a written petition, conforming
to Chapter 150B of North Carolina General Statutes, and filed with the Office of Administrative
Hearings, P. O. Drawer 27447, Raleigh, NC 27611-7447. Unless such demands are made this
permit shall be final and binding.
If you have any questions relating to this matter, please contact Mr. Donald Safrit, Supervisor of
the Permits and Engineering Unit or Mr. Steve W. Tedder, Chief of the Water Quality Section at
919/733-5083.
Sincerely,
George T. Everett
cc: Permits and Engineering Unit
facilities Assessment Unit
finical Support Unit
Raleigh Regional Offices
Mr. Jim Patrick, EPA

Division of Environmental Management
March 19, 1991
To: Don Safrit
From: Mike Scoville SOS
Through: Ruth Swanek gc.s
Trevor Clements
Subject: Comments on the Draft Permit for Durham's Farrington Road WWTP
(NPDES No. NC0047597, Durham County)
I have reviewed A. T. Rolan's comments regarding the subject permit and offer the following
responses in the order of his requests:
Biochemical Oxygen Demand (BOD) - It is acceptable to Technical Support that the BOD5 limits
contained in the permit be listed as 5 mg/1 and 7 mg/1 instead of 5.0 mg/1 and 7.0 mg/1, but recommended
that the limits remain as they are and the city choose it's own rounding and reporting convention based on
standard operating procedure.
Total Phosphorus - The City of Durham had earlier accepted the summertime 0.5 mg/1 TP limit and has
been aware of it well before now. This limit is necessary to offer protection of the sensitive New Hope
Creek arm of Jordan Lake against eutrophication, characteristics of which are well documented in the
past. This limit should remain unchanged; it is especially necessary to control TP loading after the
expansion to 20 MGD given the 99% IWC at 7Q10 flow conditions.
Chromium - The City has reported 364 chromium samples since April 1989, none of which has been
over the 50 ug/I permit limit (detection level used was 5 ug/l). Since the load of chromium permitted
from the facility through its pretreatment program is less than one -tenth of the allowable effluent load, it
would be acceptable to reduce the monitoring frequency for chromium to a monthly basis. The limit
should stay the same, but the City will have the freedom to decide the monitoring necessary to stay in
compliance. However, if the additional capacity provided by the plant expansion facilitates the addition
of any industrial or other sources of chromium it is important that DEM is notified and the requirements
revised if necessary.
Nickel - The same comments as for chromium apply for nickel, although the permitted nickel load is
greater than 10 % of the allowable effluent nickel load. The effluent nickel data shows very low
concentrations and no violations; a monthly monitoring requirement is satisfactory at the existing
limitations..
Cadmium and Lead - Cadmium and lead data from the same metals monitoring reveal several violations
of the proposed permit limits, and several values very close to exceeding the limits. These limits should
not be changed, although it may be preferable to include just the limits and not the extra monitoring
language.
Long Term Monitoring - This issue should be addressed by the Pretreatment or Permits & Engineering
Unit.
If you have any questions or comments regarding this matter, please contact me.
cc: Steve Tedder

State of North Carolina
Department of Environment, Health, and Natural Resources
Division of Environmental Management
512 North Salisbury Street • Raleigh, North Carolina 27611
James G. Martin, Governor
William W. Cobey, Jr., Secretary
March 7, 1991
Mr. A. T. Roland, Director
Department of Water Resources
City of Durham
101 City Hall Plaza
Durham, North Carolina 27701
George T. Everett, Ph.D.
Director
'i'i 0 7 1991
Subject: NPDES Permit No. NC0047597
Farrington Road WWTP
Durham County
Dear Mr. Roland:
The Division is in receipt of your letter of February 12, 1991, received by the Division on
February 25, 1991. According to our records, the draft permit for the Farrington Road Wastewater
Treatment Facility was sent to the City of Durham approximately December 24, 1990. Since no
comments were received by January 23, 1991, as required by the notice, we proceeded to issue
the permit on the scheduled issue date of February 7, 1991.
Since your comments appear to be general in nature, I feel confident that we should be
able to resolve these concerns without a formal petition at this time. However, if we are unable to
reach an agreement with your suggested changes, any objections to our decision will need to be
filed with the Office of Administrative Hearings at that time.
Once these items have been reviewed by the Raleigh Regional Office and the other
appropriate staff from the Water Quality Section, we will proceed to prepare the appropriate
response to your concerns. We will attempt to provide this response within approximately
forty-five (45) days. If you have any questions, please do not hesitate to contact me at
919/733-5083.
cc: Raleigh Regional Office
Technical Support Branch
Permits and Engineering Unit
Pollution Prevention Pays
P.O. Box 27687, Raleigh, North Carolina 27611-7687 Telephone [phone]
An Equal Opportunity Affirmative Action Employer
Steve W. Tedder, Chief
Water Quality Section

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CITY OF MEDICINE
February 12, 1991
CITY OF DURHAM
NORTH CAROLINA
Mr. Steve Tedder, Chief
Water Quality Section
Division of Environmental Management
Post Office Box 27687
Raleigh, North Carolina 27611-7687
SUBJECT:
Dear Mr. Tedder:
FEB 28 1991
PERMS h EN fN:_E NG
DEPARTI\IX:NT OF WATER RESOURCES
101 CITY HALL PLAZA
DURIIAM, NORTH CAROLINA 27701
[phone]
FEE 25 1991 ..
Draft Permit Comments
NPDES No. NC0047597
Farrington Road WWTP
City of Durham
After reviewing the draft •ermi for the City of Durham's
Farrington Road Waste - reatment Plant, the City wishes to
su•mit the following comments.
Biochemical Oxygen Demand (BOD) - this limit is extremely low,
and is virtually at the limit of technology, both for the
capability of treatment technology and for analytical
techniques. We request that the limit be given as 5 mg/1
(summer) and 7 mg/1 (winter) rather than 5.0 mg/1 and 7.0 mg/l.
Anything to the right of the decimal has no arithmetic
significance. Laboratory analysis cannot produce a significant
digit in the tenth of a part and therefore it is not valid
mathematics to list a digit which is not significant.
Total Phosphorus - this limit will be extremely difficult to
meet with biological phosphorus removal techniques. It will be
necessary to use chemical removal technology (alum feed) to
consistently comply with a 0.5 mg/1 limit. Because this limit
leaves very little margin for error a treatment plant must of
necessity, overfeed a chemical coagulant in order to insure
continued compliance. Pleaseconsider the effect on the
effluent of dissolved chemical salts as well as the
accumulation of coagulants in the sludge. The introduction of
chemical salts into the environment may not be a legitimate
trade off for the extra phosphorus reduction. We would request
that the phosphorus limit remain at 2.0 mg/1 for the entire
year. We feel we can meet a 2.0 mg/1 limit with reasonable
consistency using biological removal techniques.
3 2 :D 1991
AN EQUAL OPPORTUNITY/AFFIRMATIVE ACTION EMPLOYER

Mr. Steve Tedder
February 12, 1991
Page 2
If the limits remain as written in the draft, we would request
some guidance on how the quarterly limit is to be calculated.
Is this limit a moving average or are the quarters specified?
Chromium - the City has performed and submitted analysis on a
weekly basis since April 1989 using atomic absorption
spectroscopy with graphite furnace. This technique produces an
analytical detection limit of 50 ug/l. This detection limit is
the same as the proposed permit limit. During this period of
almost two years, we have not seen any effluent sample with a
chromium concentration above the detection limit. We know of
no known source of chromium within our service area. We
request that this parameter be deleted as a permit requirement.
Nickel - the same facts as detailed for chromium are true for
nickel. We have detected no levels of nickel above detection
levels and request that this parameter also be deleted.
Cadmium and Lead - as with chromium and nickel, we have
conducted regular analyses at the analytical detection levels.
For both these metals we have found very few cases of
concentrations in excess of the detection level. Both
parameters showed only seven (7) individuals which were higher
that the detection or permit limit. Please note that these
analyses are very expensive and time consuming to perform. We
would request that these parameters be deleted also.
Long Term Monitoring - pretreatment requirements - Part III, B.
2. of the draft permit requires the City to draft and submit a
monitoring program for the collection of facility specific data
for use in headworks analysis within 120 days of the effective
date of the permit. On April 11, 1990, we submitted a Long
Term Monitoring Plan for site specific removal efficiencies for
three City plants, including Farrington in order to meet the
terms of the JOC. After receiving a letter of approval (dated
July 27, 1990), we began implementing the plan. To date, we
have conducted two (2) monitoring events at the plant and the
third event is scheduled to commence on February 17,1991.
Therefore, we have already completed this requirement for the
permit. We request verification from your office that the
current program will satisfy the requirements of Part III, B.
and that the requirement be deleted from the permit.

Mr. Steve Tedder
February 12, 1991
Page 3
Finally, we assume that the JOC continues in force and
supercedes this permit until the JOC expires. We are also
still awaiting a response to our request for a modification to
our JOC for sludge removal and toxicity (See attached letters).
Your favorable response to all of the above will be
appreciated.
Sincerely,
DEPARTMENT OF WATER RESOURCES
A. T. Rolan
Director
ATTACHMENTS
cc: Orville W. Powell, City Manager, City of Durham, 101
City Hall Plaza, Durham, North Carolina 27701.
Cecil A. Brown, Senior Assistant City Manager,
City of Durham, 101 City Hall Plaza, Durham,
North Carolina 27701.
William W. Telford, Superintendent of Plants II,
Department of Water Resources, City of
Durham, 101 City Hall Plaza, Durham, North
Carolina 27701.
Karen Sindelar, City Attorney's Office, City of
Durham, 101 City Hall Plaza, Durham, North
Carolina 27701.
Arthur Mouberry, Regional Supervisor, Raleigh
Regional Office, Division of Environmental
Management, Post Office Box 27687, Raleigh,
North Carolina, 27611-7687.

wo As;
State of North Carolina
Department of Environment, Health, and Natural Resources
Division of Environmental Management
512 North Salisbury Street • Raleigh, North Carolina 27611
James G. Martin, Govemor George T. Everett Ph.D.
Wiliam W. Cobey, Jr., Secretary Director
February 7, 1.991
Mr. A. Terry Rolan
101 City Hall Plaza
Durham, NC 27701
Subject: Permit No. NC0047597
Durham (Farrington Road WWTP)
Durham County
Dear Mr. Rolan:
In accordance with your application for discharge permit received on July 27,
1990, we are forwarding herewith the subject State - NPI)ES permit. This permit is
issued pursuant to the requirements of North Carolina General Statute 143-215.1 and
the Memorandum of Agreement between North Carolina and the US 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,
Post Office Drawer 27447, Raleigh, North Carol inn 2761 1-74,47.. Unless such demand is
made, this decision shall be final and binding.
Please take notice that this permit is not transferable. Part II, E.4.
addresses the requirements to be followed in case of change in ownership or control of
this discharge.
This permit does not affect the legal requirements to obtain other permits
which may be required by the Division of Environmental Management or permits required
by the Division of Land Resources, Coastal Area Management: Act or any other Federal or
Local governmental permit that may be required.
If you have any questions concerning t.h i s permit, please contact Mrs. Rosanne
Barons at telephone number 919/733-5083.
Sincerely,
Original Signed By
Donald SMNit for
George T. Everett
cc: Mr. Jim Patrick, EPA
Raleigh Regional Office
Pollution Prevention Pays
nn a,,Y 77eR7_ Raleigh. North Carolina 27611-7687 Telephone [phone]

•
Permit No. NC0047597
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT, HEALTH, AND NATURAL RESOURCES
DIVISION OF ENVIRONMENTAL MANAGEMENT
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 Durham
is hereby authorized to discharge wastewater from a facility located at
Farrington Road Wastewater Treatment Plant
6605 Farrington Road
Durham
Durham County
to receiving waters designated as New Hope Creek in the Cape Fear River Basin
in accordance with effluent limitations, monitoring requirements, and other conditions set forth in
Parts I, II, and III hereof.
This permit shall become effective April 1, 1991
This permit and the authorization to discharge shall expire at midnight on February 29, 1996
Signed this day February 7, 1991
Original Signed By
Donald Saftit for
George T. Everett, Director
Division of Environmental Management
By Authority of the Environmental Management Commission

•• K► '' ,
•
Permit No. NC0047597
SUPPLEMENT TO PERMIT COVER SHEET
City of Durham
is hereby authorized to:
1. Continue to operate the existing 10.0 MGD wastewater treatment facility, and upon completion
of construction operate at a total flow of 20.0 MGD for the facility located at Farrington Road
Wastewater Treatment Plant, 6605 Farrington Road, Durham, Durham County (See Part III of
this Permit), and
2. Discharge from said treatment works at the location specified on the attached map into New
Hope Creek which is classified Class C-NSW waters in the Cape Fear River Basin.

780 000
FEET
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Mapped, edited, and published by the Geological Survey
Control by USGS, NOS/NOAA, and North Carolina Geodetic Survey
Topography by photogrammetric methods from aerial photographs
taken 1972, Field checked 1973
Projection and 10,000-foot grid ticks: North Carolina coordinate system
(Lambert conformal conic). 1000-meter Universal Transverse Mercator
grid ticks, zone 17, shown in blue: 1927 North American f
To place on the predicted North American Datum 1983 move the
projection Tines 11 meters south and 22 meters west as shown
by dashed 'ornr+r r
683 2 010 000 FEET
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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(s) serial number 001. Such discharges shall be limited and monitored by the pennittee as specified below:
Effluent Characteristics
Discharge Limitations
Monthly Avg,
Flow 20.0 MCA
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
Chronic Toxicity*****
0.5mg/I****
Weekly Avg.
7.5 mg/I
45.0 mg/I
1.5 mg/I
400.0 /100 ml
pally Max
Monitoring
Measurement
Frequency
Continuous
Daily
Daily
Daily
Daily
Daily
17.0 ug/I Daily
Daily
Monthly
Weekly
Quarterly
Requirements
Sample *Sample
TVDe Location
Recording I or E
Composite E, I
Composite E, 1
Composite E
Grab E, U, D
Grab E, U, D
Grab E
Grab E,U,D
Composite E
Composite E
Composite E
*Sample locations: E - Effluent; I - Influent; U - Upstream 50 feet (existing site); D = D 1 + D2 + D3; Di - Downstream at DN2, above
channelized section above the lower subimpoundment, D2 - Downstream at NCSR 1107, D3 - Downstream at DN5 (5 miles downstream)
Upstream and downstream samples shall be grab samples. Stream samples for temperature, dissolved oxygen, fecal coliform and conductivity
shall be collected three times per week during June - September, and weekly during the remaining months of the year. Stream samples for
total phosphorus, PO4, TKN, NH3 as N, and NO2 + NO3 shall be collected weekly.
**The monthly average effluent BOD5 and Total Suspended Residue concentrations shall not exceed 15 % of the respective influent value (85
%) removal.
*** The daily average dissolved oxygen effluent concentration shall not be less than 6.0 mg/l.
**** Quarterly Average Limit
***** Chronic Toxicity (Ceriodaphnia) P/F at 99%; January, April, July and October; See Part III, Condition F.
****** See Part III, Condition G.
******* Samples for this metal shall be taken five days per week. The first sample shall be analyzed and if the results are at or above the
weekly average limit, all five samples shall be analyzed and reported. Otherwise, if the sample results are below the weekly average limits, the
remaining four samples need not be analyzed.
The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units and shall be monitored daily at the effluent by grab sample.
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. NC0047597
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. (Continued)
Effluent Characteristics
Pollutant Analysis
Conductivity
Cadmium
Chromium
Nickel******
Lead
Cyanide
Mercury
Copper
Zinc
Silver
PO4'
TKN*
NO2+NO3*
Total Phosphorus*
NH3 as N*
*
Discharge Limitations
Units (specify)
Monthly Avg, Weekly Avg, Daily Max
2.0 ug/I
50.0 ug/I
88.0 ug/I
• 25.0 ug/!
4.5 ug/I
75.0 ug/I
132.0 ug/I
34.5 ug/I
Monitoring
Measurement
Frequency
Annually
*
Daily
Daily
Daily
Daily
Monthly
Monthly
Monthly
Monthly
Monthly
Weekly
Weekly
Weekly
Weekly
Weekly
Requirements
Sample
Type
Grab
Composite
Composite
Composite
Composite
Grab
Composite
Composite
Composite
Composite
Grab
Grab
Grab
Grab
Grab
*Sample
Location
E
U, D
E
E
E
E
E
E
E
E
E
U,D
U,D
U,D
U,D
U,D

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(s) serial number 001. Such discharges shall be limited and monitored by the permittee as specified below:
Effluent Characteristics Discharge Limitations Monitoring Requirements
Measurement Sample *Sample
Monthly Avg, Weekly Avg, Daily Max Frequency Type Location
Flow 20.0 MCD Continuous Recording I or E
BOD, 5 day, 20°C** 7.0 mg/I 10.5 mg/I Daily Composite E, I
Total Suspended Residue** 30.0 mg/I 45.0 mg/1 Daily Composite E, 1
NH3 as N 2.0 mg/1 3.0 mg/I f Daily Composite E
Dissolved Oxygen*** 4 Daily Grab E, U, D
Fecal Coliform (geometric mean) 200.0 /100 ml 400.0 /100 ml Daily Grab E, U, D
Total Residual Chlorine 17.0 ug/I Daily Grab E
Temperature Daily Grab E,U,D
Total Nitrogen (NO2 + NO3 + TKN) Monthly • Composite E
Total Phosphorus 2.0 m g / I * * * * Weekly Composite E
Chronic Toxicity Quarterly Composite E
*Sample locations: E - Effluent, I - Influent, U - Upstream 50 feet (existing site), D - Downstream at NCSR 1107
Upstream and downstream samples shall be grab samples. Stream samples shall be collected once per week.
**The monthly average effluent BODS and Total Suspended Residue concentrations shall not exceed 15 % of the respective influent value (85
%) removal.
*** The daily average dissolved oxygen effluent concentration shall not be less than 6.0 mg/l.
**** Quarterly Average Limit
***** Chronic Toxicity (Ceriodaphnia) P/F at 99%; January, April, July and October, See Part III, Condition F.
****** See Part III, Condition G.
******* Samples for this metal shall be taken five days per week. The first sample shall be analyzed and if the results are at or above the
weekly average limit, all five samples shall be analyzed and reported. Otherwise, if the sample results are below the weekly average limits, the
remaining four samples need not be analyzed.
The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units and shall be monitored daily at the effluent by grab sample.
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. NC0047597
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. (Continued)
4
Effluent Characteristics
Pollutant Analysis
Conductivity
Cadmium
Chromium
Nickel
Lead
Cyanide
Mercury
Copper
Zinc
Silver
•
• .
•
Discharge Limitations
Units (speclfyl
Monthly Avg: Weekly Avgi Daily Max Frequency
Annually
2.0 ug/I 4.5 ug/I
50.0 ug/I 75.0 ug/I
88.0 ug/I 132.0 ug/I
25.0 ug/I 34.5 ug/I
Monitoring
Measurement
Daily
Daily
Daily
Daily
Monthly
Monthly
Monthly
Monthly
Monthly
Requirements
ample
0
Grab
Composite
Composite
Composite
Composite
Grab
Composite
Composite
Composite
Composite
*Sample
Location
E
U, D
E
E
E
E
E
E
E
E
E
•
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8 CAR(
CITY OF MEDICINE
CITY OF DURHAM
NORTH CAROLINA
November 28, 1990 DEPARTMENT OF WATER RESOURCES
101 CITY HALL PLAZA
DURHAM. NORTH CAROLINA 27701
[phone]
Dr. George T. Everett, Director
Division of Environmental Management
Department of Environment, Health
and Natural Resources
Post Office Box 27687
Raleigh, North Carolina 27611-7687
SUBJECT: Final Phase B Report for the City of Durham
Toxicity Reduction Evaluation
Dear Dr. Everett:
The City of Durham is pleased to submit two (2) copies of the
referenced Final Phase B Report in accordance with the
approved plan for toxicity reduction evaluation as provided
for under JOC #89-03. As shown in the report, the simulation
studies indicates that the proposed level of treatment to be
provided at Farrington Road and Northside should eliminate
toxicity from these effluents. After you and your staff have
had an opportunity to review the enclosed reports, we would
be happy to meet with you during the week of December 17,
1990 if necessary, to discuss the report.
Based on the work to date, we would recommend that no further
work on toxicity reduction be carried out other than a
continuation of the quarterly monitoring requirements
required under Attachment B of the JOG. In order to
accomplish this, we request that the JOC be amended to delay
the effective date of enforcement of toxicity limits from
January 1, 1991 until three (3) months after completion of
construction of the new facilities. Your favorable
consideration of this requested modification will be
appreciated.
Sincerely,
A. T. Rol an
Director
ATR/cbt
1190281
cc:
Mr. Gordon Ruggles
Mr. John A. Botts
Mr. William W. Sun
AN EOUAL OPPORTUNITY/AFFIRMATIVE ACTION EMPLOYER

W
CITY OF' MEDICINE
CITY OF DURHAM
NORTH CAROLINA
November 6, 1990
Dr. George T. Everett, Director
Division of Environmental Management
Post Office Box 27687
Raleigh, North Carolina 27611-7687
Dear Mr. Everett:
DEPARTMENT OF WATER RESOURCES
101 CITY HALL PLAZA
DURHAM, NORTH CAROLINA 27701
[phone]
This is in reference to your letter of May 18, 1990
concerning the City of Durham's short term sludge management
plan and compliance with Consent Judgement (J0C #89-03). The
City of Durham hereby requests an extension of the completion
date of February 7, 1991 as indicated in the last paragraph
of your letter.
We understand that the completion date was set so as to
comply with paragraph 9-b-2-iv of the Consent Judgement and
was based on Arthur Mouberry's approval letter dated
February 7, 1990. We assume that this completion
date was predicated on your assumption that the City of
Durham was in a position to immediately begin land
application of sludge.
The City was ready to begin land applying sludge, having
entered into a contract with AMSCO, Inc. in July, 1989 for
them to carry out our sludge management program, but we were
not able to submit an acceptable permit application package
until May 7, 1990, as indicated in your letter. Please refer
to my letter of March 23, 1990 to you which highlights new
and additional requirements and delays which were imposed
during the preparation of our permit application package.
The City of Durham finally received an approved land
application permit dated August 10, 1990. AMSCO, Inc.
immediately, properly and adequately notified involved County
Managers, mobilized their equipment and began land
application on August 20, 1990. Through September,
approximately 12,500 cubic yards of sludge have been land
applied. The total estimated amount of stored sludge in our
short-term sludge plan was 56,000 yards of dry sludge and
approximately 2,000,000 gallons of liquid sludge.
AN EOUAL OPPORTUNITY/AFFIRMATIVE ACTION EMPLOYER

Dr. George T. Everett
Page Two
November 6, 1990
The City also began investigating the application of Cement
Kiln Dust (CKD) to stabilize sludge with the goal that the
final product could be used as a daily cover material
supplement in the solid waste landfill.
An application was submitted in January, 1990 to the Solid
Waste Section (Mr. Gordon Layton) for approval to utilize the
CKD stabilized sludge product as a daily cover supplement.
Approval of this application was finally received on
October 3, 1990.
Approximately 12,000 cubic yards of CKD stabilized sludge
product have been produced at our Northside WWTP and
approximately 4,000 cubic yards of this product
has been delivered to the landfill for use as cover material
supplement. A request to increase the daily allowable mix
ratio of CKD product and regular soil filed on October 2,
1990 has yet to be answered.
Based on the quantities of sludge that have been processed
since required permits have been received, the City of Durham
cannot complete the short-term sludge management plan by
February 9, 1991. Additionally, AMSCO advised us
that considering an average amount of inclement weather, we
can expect only 180-190 days during a year as good "land
application days."
Based on the above extenuating circumstances and conditions,
the City of Durham respectfully requests that the completion
date for our short-term sludge management plan be extended to
August 20, 1991.
ATR/TKB : c bt
1190061
cc:
Mr. Arthur Mouberry
Mr. Dennis Ramsey
Mr. Kent Wiggins
Si ncer.el y,
A. T. Rolan
Director

REQU
PERMIT NO.: NC0047597
NPDES WASTE LOAD ALLOCATION
PERMITTEE NAME: City of Durham / Farrington Road WWTP
Facility Status: Existing
Permit Status: Renewal
Major �1
Pipe No.: 001
Minor
Design Capacity: 20.0 MGD
Domestic (% of Flow): 99.15 %
Industrial (% of Flow): .85 %
Comments:
in process of expanding (copy of engineering proposal attached)
RECEIVING STREAM: New Hope Creek
Class: C-NSW
Sub -Basin: 03-06-05
Reference USGS Quad: D " ' " "Da 31\1 k) (please attach)
County: Durham
Regional Office: Raleigh Regional Office
Previous Exp. Date: 1/31/91 Treatment Plant Class: Class 4
Classification changes within three miles:
none
Requested by:
Prepared by:
Reviewed by: Wail, C. u Spi(]nte ie-- /
30u (A. IK . 5 S) 3 (K)
Rosanne Barona
Date:
Date:
9/13/90
Modeler
Date Rec.
#
\, s
Q tL O 50
sat sG
Drainage Area (mil ) 75,0
Avg. Streamflow (cfs): 77.0
7Q10 (cfs) c�1 S Winter 7Q10 (cfs) 1,0,0 30Q2 (cfs) 3,60
Toxicity Limits: IWC qq % Acut_,
Ohroa:c Ccr:oSa(1 n.a Q r1.
t Instream Monitoring: -feud
s I vk k
(erh¢era1tn�C j D0, -ut e.t.PorM G„J„c�+vr�.� €, ►/✓eek
Parameters -CP4 PoL{ , 'c1Csl3 NIA, r N0, < NoT once per .'iek St4 "'"'e catty
Upstream Y Location 50 CI- Is4t1 M (ex:sa:n, s:{e)
,)A+ on2, Ab.vt swb:MPe�ndncnf
Downstream Y Location z' A+ stk. no/
3) A+ DIJSi 5 0,.45 .4ownsf rt* t
Effluent
Characteristics
Summer
Winter
BOD5 (mg/1)
S
7
NI-I3-N (mg/1)
-
D.O. (mg/1)
6
TSS (mg/1)
30
3 v
F. Col. (/100 ml)
zoo
zoc..
pH (SU)
6 -9
6-9
TP (milt
0.5
2.0
to-61 Res. wl el' (imi4)
tl
,
17
C MuAM ("5i4
I.
14. $
ell
50
,
1S
1Lhrom4u+n
V;ckel 1-49fl
IS
t �z ,
I.ea� (VI)
2.5
311.5
C�rtAI.t (4)
IilDn:i-or
fl<roAcy ("1/t)
Mon;46(
Ex:s+:n •Aio.tifi.cki
;+�tu141. :A +ln PLC
c.1ian
oat.
ltvtt reiv..rt 4.n+s for
RetDMMt.Ari e414.4.e44-
roe+et5 should be
me) nriat ne ec-
Comments: ciNet.c z: n . 1 out Z S, lw r o s welt.
-f�is �Qra►. is a wr f 1, e_ dune-5
'�"�1_'`- n -
� II •o7}rvxn'l fvtJA.Zo(`�rk� ` SiT'�s S�ul,� B� Mon.�ore� .r1 X� SUMnM.rr CkP +(
Wtnic< <r.S�1-ptwnt ntion.i�^J (d,v-14.c-cM) pt1C0rn4.1 ves+tta" aci" S(Z 1107 (It2) orl`y.
loISr,Ic
Mi.ntrr

Request No.: 5856
WASTELOAD ALLOCATION APPROVAL FORM
Facility Name:
NPDES No.:
Type of Waste:
Status:
Receiving Stream:
Classification:
Subbasin:
County:
Regional Office:
Requestor:
Date of Request:
Quad:
CITY OF DURHAM - FARRINGTON ROA5pEbrfl 1990
NC0047597
99.15% DOMESTIC, 0.85%
M/1T_TF TC ET TON i1
rrrri � � i � c .rt i i c rya 1�lJ�P.M/
NEW HOPE CREEK
C-NSW
030605 Drainage area:
DURHAM Summer 7Q10:
RALEIGH Winter 7Q0:
ROSANNE BARONA Average f1 w:
9/13/90 30Q2:
D23NW
INDUSTRIAL
rgAtfc
e
OCTi)p;
75.000 sqy mi
0.15 cfs
2.00 cfs
77.00 cfs
3.60 cfs
RECOMMENDED EFFLUENT LIMITS
Summer Winter Weekly Daily
Wasteflow (mgd): 20 20 Avg. Max.
BOD5 (mg/1): 5 7 Cadmium (ug/l): 2 4.5
NH3N (mg/1) : 1 2 Chromium (ug/1) : 50 75
DO (mg/1) : 6 6 Nickel (ug/1) : 88 132
TSS (mg/1) : 30 30 Lead (ug/1) : 25 34.5
Fecal coliform (#/100m1): 200 200 Cyanide (ug/l): 5 15
pH (su) : 6-9 6-9 Mercury (ug/l) : 0.012 0.018
TP (mg/1): 0.5 2 Effluent should be sampled daily
Tot. Resid. CL (ug/l): 17 17 for metals.
Toxicity Testing Req.: Chronic/Ceriodaphnia/Qrtrly
MONITORING
Upstream (Y/N): Y Location: 50 Feet upstream of discharge point
Downstream (Y/N): Y Location: 1) AT DN2, above channelized section
above the lower subimpoundment 2) At SR 1107
3) At DN5, 5 miles downstream
COMMENTS
Recommend effluent monitoring of copper, zinc, and silver as well.
The existing analytical detection level requirements for metals should be
included in the permit. Recommend instream monitoring of cadmium, nickel,
lead, cyanide, mercury, copper (weekly), and zinc (weekly). Metals limits
and monitoring requirements based on pretreatment and effluent data.
Recommend instream monitoring of temperature, DO, fecal coliform, pH, and
conductivity 3/week in the summer (Apr. -Oct.) and weekly in the winter.
Weekly instream monitoring of TP, PO4, TKN, NH3, and NO2+NO3 should be
required in the summer months as well at all sites. Winter instream
monitoring is required only at the upstream site and downstream site (2).
Recommended by:
Reviewed by
Tech Support Supervisor:
Regional Supervisor:
Permits & Engineering:
RETURN TO TECHNICAL
'tau, L C. axiiviL
Date: (ii/w
Date: Q/!$1g0
§-q1WAt_
/O/h'//ia
Lee ►c) Date: wrw
SERVICES BY:
TtDate:
OCT 2 5 199C

Facility Name DtiAtkam Farrirt1bn RockWWjip Permit # f .00'175q 7
CHRONIC TOXICITY TESTING REQUIREMENT (QRTRLY)
The effluent discharge shall at no time exhibit chronic toxicity in any two consecutive toxicity tests,
using test procedures outlined in:
1.) The North Carolina Ceriodaphnia chronic effluent bioassay procedure (North Carolina Chronic
Bioassay Procedure - Revised *June 1988) or subsequent versions.
The effluent concentration atwhich there may be no observable inhibition of reproduction or
significant mortality is qa % (defined as treatment two in the North Carolina procedure
document). The permit holder shall perform quarterly monitoring using this procedure to establish
compliance with the permit condition. The first test will be performed after thirty days from
issuance of this permit during the months of Oct San, Apr, 3u I . Effluent
sampling for this testing shall be performed at the NPDES permitted final effluent discharge below
all treatment processes.
All toxicity testing results required as part of this pernut condition will be entered on the Effluent
Discharge Monitoring Form (MR-1) for the month in which it was performed, using the parameter
code TGP3B. Additionally, DEM Form AT-1 (original) is to be sent to the following address:
Attention: Environmental Sciences Branch
North Carolina Division of
Environmental Management
P.O. Box 27687
Raleigh, N.C. 27611
Test data shall be complete and accurate and include all supporting chemical/physical measurements
performed in association with the toxicity tests, as well as all dose/response data. Total residual
chlorine of the effluent toxicity sample must be measured and reported if chlorine is employed for
disinfection of the waste stream.
Should any single quarterly monitoring indicate a failure to meet specified limits, then monthly
monitoring will begin immediately until such time that a single test is passed. Upon passing, this
monthly test requirement will revert to quarterly in the months specified above.
Should any test data from this monitoring requirement or tests performed by the North Carolina
Division of Environmental Management indicate potential impacts to the receiving stream, this
permit may be re -opened and modified to include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum
control organism survival and appropriate environmental controls, shall constitute an invalid test
and will require immediate retesting(within 30 days of initial monitoring event). Failure to submit
suitable test results will constitute noncompliance with monitoring requirements.
7Q10 0. 15 cfs
Permited Flow 240 MGD
IWC% it Ca,
Basin &Sub -basin o30605 ��� S.
Receiving Stream New l-1ope Cn►ck cr
at,
County -Due Inane Date 4 17( O
Recommended by:
**Chronic Toxicity (Ceriodaphnia) P/F at elel %, Oc4) Tan;A?r) 3tAI , See Part 3 , Condition .I .

,C11(S/9d
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5

• 09/17/90 ver 3.1 T OXICS REVIEW
Facility: Farrington Road WWTP
NPDES Permit No.: NC0047597
Status (E, P, or M) : E
Permitted Flow: 20.0 mgd
Actual Average Flow: 10.0 mgd
Subbasin: 030605
Receiving Stream: New Hope Creek I ---------PRETREATMENT DATA--------------I----EFLLUENT DATA---- I
Stream Classification: C-NSW I ACTUAL PERMITTED' I
7Q10: 0.2 cfs I Ind. + Ind. + I FREQUENCY I
IWC: 99.52 4 I Domestic PERMITTED Domestic 1 OBSERVED of Chronic'
Stn'd / Bkg I Removal Domestic Act.Ind. Total Industrial Total 1 Eflluent Criteria I
Pollutant AL Conc. I Eff. Load Load Load Load Load ' Conc. Violations'
(uq/1) (ug/1) I % (#/d) (#/d) (#/d) (#/d) (#/d) 1 (ug/1) (#vio/#sam)I
_______-- -_ -------- I
Cadmium S 2.0 I 924 0.2 0.0 0.18 0.0 0.200 1 23.3 I
Chromium S 50.0 I 89% 3.1 0.1 3.14 0.2 3.240 1 6.7 I I
Copper AL 7.0 I 904 3.8 0.2 3.92 0.0 3.770 1 80.0 I N
Nickel S 88.0 1 394 1.3 0.0 1.30 0.3 1.610 1 65.3 I P
Lead S 25.0 I 81% 3.1 0.0 3.09 0.1 3.140 1 146.0 I U
Zinc AL 50.0 I 84% 10.8 0.5 11.27 0.1 10.860 1 302.0 I T
Cyanide S 5.0 I 59% 2.5 0.0 2.53 0.0 2.530 1 18.0 I
Mercury S 0.012 I 864 0.0 0.0 0.03 0.0 0.020 1 0.2 I S
Silver AL 0.06 I 944 0.3 0.0 0.31 0.0 0.340 1 I E
Selenium S 5.00 I 04 1 I C
Arsenic S 50.00 I 0% 1 I T
Phenols S NA I 95% 1 I I
NH3-N C I 0% 1 10
T.R.Chlor.AL 17.0 I 0% 1 I N
I 1 I
I 1 I
I 1 I
I--------------- ALLOWABLE PRDCT'D PRDCT'D PRDCT'D--------MONITOR/LIMIT--------- 1--ADTN'L RECMMDTN'S-- 1
Effluent Effluent Effluent Instream 1 Recomm'd
Conc. using using Conc. Based on Based on Based on 1 FREQUENCY INSTREAM 1
' Allowable CHRONIC ACTUAL PERMIT using ACTUAL PERMITTED OBSERVED 1 Eff. Mon. Monitor. 1
Pollutant 1 Load Criteria Influent Influent OBSERVED Influent Influent Effluent 1 based on Recomm'd ? 1
(#/d) (ug/1) (ug/1) (ug/1) (ug/1) Loading Loading Data 1 OBSERVED (YES/NO) 1
1---------I --------- -------- 1
Cadmium S 1 2.10 2.010 0.175 0.193 23.22 Monitor Monitor Limit 1 NCAC YES 1 A
Chromium S I 38.11 50.242 4.155 4.292 6.63 Monitor Monitor Limit I NCAC NO 1 N
Copper AL 1 5.87 7.034 4.722 4.540 79.61 Monitor Monitor Monitor 1 Weekly YES I A
Nickel S I 12.10 88.426 9.528 11.828 64.94 Limit Limit Limit 1 NCAC YES I L
Lead S I 11.03 25.121 7.064 7.185 145.30 Limit Limit Limit 1 NCAC YES 1 Y
Zinc AL 1 26.20 50.242 21.709 20.927 300.55 Monitor Monitor Monitor I Weekly YES I S
Cyanide S I 1.02 5.024 12.493 12.493 17.91 Limit Limit Limit I NCAC YES I I
Mercury S 1 0.01 0.012 0.047 0.034 0.20 Limit Limit Limit I NCAC YES 1 S
Silver AL I 0.08 0.060 0.225 0.246 0.00 Monitor Monitor I
Selenium S 1 0.42 5.024 0.000 0.000 0.00 1 I R
Arsenic S 1 4.19 50.242 0.000 0.000 0.00 I I E
Phenols S I 0.000 0.000 0.000 0.00 I I S
NH3-N C I 0.000 0.00 I I U
T.R.Chlor.AL I 17.082 0.00 I I L
I I IT
i i iS

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and- r1 C on � I Mrtn gfiuyrtf I"t4>,j.
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rytA; re. r►ui fs kc4,4 se_
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A(NAJ7 tvift

New Hope Creek Instream Monitoring June - September
Temp DO % Sat pH BOD5 Fecal Coli TP TKN NH3-N NOx Cond
Upstream
N= 80 80 80 79 36 78 36 9 37 9 24
Mean= 22.53 5.50 0.63 7.05 2.25 1063.83 0.45 1.11 0.12 0.81 175.67
Std Dever 3.61 1.09 0.12 0.27 0.87 1635.97 1.06 0.28 0.05 1.17 82.43
CV= 16.01 19.81 18.65 3.77 38.85 153.78 236.31 24.83 43.60 144.10 46.93
Downstream #1
N= 39 39 39 39 13 39 13 9 13 9 24
Mean• 23.28 6.24 0.73 7.09 2.38 775.95 1.40 1.21 0.15 10.78 364.75
Std Dev= 2.58 0.76 0.08 0.20 1.04 1019.41 0.62 0.66 0.17 4.01 78.26
% CV= 11.10 12.10 10.77 2.86 43.78 131.38 44.22 54.53 113.86 37.20 21.46
Downstream #2
N= 68 68 68 67 32 66 32 18 33 19 24
Mean= 23.46 6.04 0.71 7.06 2.56 1083.71 1.21 1.59 0.17 10.85 373.75
Std Dev= 2.75 0.92 0.11 0.34 1.41 1678.55 0.57 0.83 0.18 4.27 69.32
% CV= 11.73 15.24 15.80 4.87 55.13 154.89 47.22 51.92 103.64 39.32 18.55
Downstream #3
N= 27 27 27 27 9 27 9 9 9 9 24
Mean= 24.37 4.93 0.59 7.05 2.22 261.44 1.18 1.23 0.10 10.17 366.21
Std Dev= 2.00 0.51 0.06 0.25 0.83 154.33 0.47 0.74 0.00 3.12 77.67
% CV= 8.22 10.32 9.43 3.55 37.50 59.03 39.77 60.27 0.00 30.67 21.21

0)
E
0
New Hope Creek D0, June -September, 1988-90
8
1-
4:
\IP
it=62
0
0
0
rI=27
Upstream DN2 SR 1 107 5 Miles Down

is This facility is currently implementing a
Please include the following conditions:
'po11NPDES PRETREATMENT INFORMATION R X UFST FORM (� i
/Ole.
FACILITY NAVE: i i i,x
C ;AE f DU"' 2a4 NPES DNO. NCO 0 7 9 '
pO
R QUES'rr�t : / A i/ e — —
�Cci^O DATE : 8 / / O RFrJcN: /P4/e i�9Li
PERMIT CONDITIONS OOVERING PRETREAThWNT
This facility has nc fU; and should net have pretreatment la a
This facility should and/or is developing ge'
Please include the following F' S a pretreatment program.
g conditions:
Program Deve lopraen t
Phase I due / /
Phase II due --/--/
Additional Conditions
(attached)
pretreatment program.
Program Implementation
Additional Conditions
(attached)
SIGNIFICANT INDUSTRIAL USERS' (SIUs) CONTRIBUTIONS
SIU FLOW - 'DOTAL:
- COITION:
11,oT 11'1.F
C&€r stole
TFTICTILE :
METAL FINISHING:
OTHER:
Past Two
AC7uh-1--
0.(3. 0 A PGD
02g
0 a
0
MGD
MGD
MGD
MCZ
MGD
MGD
HEADWORKS REVIEW
PARAMETER i---------DAILY • . IN LBS/
ALLOWBLE DOMESTIC MIMED
Cd 1.43. 0.1S D.oa
Cr q . 9$ 3.0 g (5. 1 (,)
Cu 9.4 a 3 .?.6 0.01
Ni a . I 1 1. a9 _00 ,
Pb $.S6 3.0g 0.0 6
Zn 114.1Lf l0.79 0.0a
CN 0.9C, a.s3 O
Phenol l s/ 1 g O
Other A-5 10 . Er It 0.31 6.03
14 O.69 0.02
qS
0.00g gb
RECEIVED : g'/ 6 / 96 REVI FWED BY :
RETURNED: g-/!3 /9v
bu .g�
r 5a43

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