NC0026051_Permit Issuance_20060918

.;WAT
,..a�^^Rp Michael F. Easley
G Governor
r?J r William G. Ross, Ir., Secretary
— > 1 North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E., Director
Division of Water Quality
September 18, 2006
Mr. Glen E. Whisler, County Engineer
County of Durham
120 E. Parrish St.
Durham, North Carolina 27701
Subject: Issuance of NPDES Permit
Permit NC0026051
Durham County Triangle WWTP
Durham County
Dear Mr. Whisler:
Division personnel have reviewed and approved your application for renewal of the subject permit. Accordingly,
we are forwarding the attached NPDES discharge 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
U.S. Environmental Protection Agency dated May 9, 1994 (or as subsequently amended).
In response to your comments and other considerations the draft permit was modified as follows:
• The fluoride and mercury limits will remain in the permit. The fluoride sample type was changed to
composite. The mercury limit was changed to a weekly average limit. The reasonable potential
analysis is based on a statistical method. All the values in a data set used in the analysis can be
below the allowable limit and the calculations will show that reasonable potential exists, which is
the case with your fluoride and mercury data. This statistical method is approved by EPA and
applied consistently to all permits.
• The description of the treatment system in the supplement to permit cover sheet was modified to
indude existing components.
• The footnote reference for chloroform was corrected.
• Nutrient monitoring was modified from 3/Week to Weekly.
• Section A. (1) was modified to read "Beginning upon the effective day of this permit and lasting
until expiration..."
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 Quality or permits required by the Division
of Land Resources, the Coastal Area Management Act or any other Federal or Local governmental permit that
may be required.
One
o Carolina
atura!!y
North Carolina Division of Water Quality 1617 Mail Service Center Raleigh, NC 27699-1617 Phone [phone] Customer Service
Internet h2o.enr.state.nc.us 512 N. Salisbury St. Raleigh, NC 27604 FAX [phone]
An Equal Opportunity/Affirmative Action Employer-50% Recycied/10% Post Consumer Paper

Permit No. NC0047597
South Durham Water Reclamation Facility
Page 2
If you have any questions concerning this permit, please contact Teresa Rodriguez at telephone number (919)
733-5083, extension 553.
Sincerely,
foe, Alan W. Klimek, P.E.
Cc: NPDES Files
Raleigh Regional Office — Surface Water Protection
Aquatic Toxicology Unit
USEPA Region 4

Permit NC002605 1
•
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
PERMIT
TO DISCHARGE WASTEWAI'r,R UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provisions 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,
Durham County
is hereby authorized to discharge wastewater from a facility located at the
Durham County Triangle WWTP
5926 NC Highway 55
Durham County
to receiving waters designated as Northeast Creek in the Cape Fear River Basin in accordance
with effluent limitations, monitoring requirements, and other conditions set forth in Parts I, II,
III, and IV hereof.
The permit shall become effective November 1, 2006.
This permit and the authorization to discharge shall expire at midnight on April 30, 2011.
Signed this day September 18, 2006.
-rvr '. Alan . Klimek, P.1cthr
Division of Water Quality
By Authority of the Environmental Management Commission

Permit NC0026Ur51
4
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby revoked.
As of this permit issuance, any previously issued permit bearing this number is no longer effective.
Therefore, the exclusive authority to operate and discharge from this facility arises under the permit
conditions, requirements, terms, and provisions included herein.
Durham County is hereby authorized to:
1. Continue to operate an existing 12.0 MGD wastewater treatment facility located south of
Durham at the Durham County Triangle WWTP off NC Highway 55 in Durham County.
The facility includes the following treatment components:
Mechanical fine screens
Mechanical grit removal
• Parshall flume
• Influent pump station
• Three 5-stage BNR trains
Four secondary clarifiers
• Five tertiary sand filters
• Ultraviolet disinfection
Post aeration
Sludge lagoons
Waste and return activated sludge pumping system
Methanol, potassium hydroxide, and sodium hypochlorite storage and feed systems
2. Discharge from said treatment works (via Outfall 001) into Northeast Creek, a Class WS-1V
NSW water in the Cape Fear River Basin, at the location specified on the attached map.

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Durham Co. Triangle WWTP - NC0026051
Facility
USGS Quad Name: SW Durham
Receiving Stream: Northeast Creek
Lat.: 35°52'51-
Long.: 78°53'50"
--
Location
Stream Class: WS-IV NSW
Subbasin: Catawba — 03-06-05
North
SCALE 1: 24,000

Permit NC00260{5 1
A. (1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
Beginning upon the effective day of this permit and lasting until expiration, the Permittee is authorized
to discharge treated wastewater from Outfall 001. Such discharges shall be limited and monitored by
the Permittee as specified below:
EFFLUENT
CHARACTERISTICS
EFFLUENT LIMITATIONS
MONITORING REQUIREMENTS
Monthly
Average
Weekly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Locations
Flow
12.0 MGD
Continuous
Recording
Influent or
Effluent
BOD,5-day. 20°C
(April 1 October 31)2
5.0 mg/L
7.5 mg/L
Daily
Composite
Influent and
Effluent
BOD,5-day, 20°C
(November 1 - March 31)2
10.0 mg/L
15.0 mg/L
Daily
Composite
Influent and
Effluent
Total Suspended Solids2
30.0 mg/L
45.0 mg/L
Daily
Composite
Influent and
Effluent
NH3 as N (April 1- October
31)
1.0 mg/L
3.0 mg/1
Daily
Composite
Effluent
NH3 asN
(November 1 - March 31)
1.8 mg/L
5.4 mg/1
Daily
Composite
Effluent
Total Residual Chlorine3
17 µg/L
Daily
Grab
Effluent
Chloroform3
2/Month
Grab
Effluent
Bromodichloromethane3
1.8 µg/L
Weekly
Grab
Effluent
Dibromochloromethane3
1.3 µg/L
Weekly
Grab
Effluent
Fecal Coliform
(geometric mean)
200/ 100 ml
400/ 100 ml
Daily
Grab
Effluent
Dissolved Oxygen
Daily
Grab
Effluent
Temperature
Daily
Grab
Effluent
pHs
Daily
Grab
Effluent
TKN
Weekly
Composite
Effluent
NO2-N +NO3-N
Weekly
Composite
Effluent
Total Nitrogen6
No Limit (mg/L
No Limit (pounds/month)
Annual Limit: 100,452 pounds/year
Weekly
Monthly
Annually
Composite
Calculated
Calculated
Effluent
Effluent
Effluent
Total Phosphoruss
No Limit (mg/L)
No Limit (pounds/month)
Annual Limit: 10,204 pounds/year
Weekly
Monthly
Annually
Composite
Calculated
Calculated
Effluent
Effluent
Effluent
Total Mercury?
0.012 {cg/L
Weekly
Grab
Effluent
Fluoride
18001cg/L
Weekly
Composite
Effluent
Total Copper
Monthly
Composite
Effluent
Total Zinc
Monthly
Composite
Effluent
Chloride
Monthly
Composite
Effluent
Effluent Pollutant Scans
Annually
m osite/
Composite/
Effluent
Chronic Toxicity9
Quarterly
Composite
Effluent
See notes on next page.

Permit NC0026051
•
Notes:
1. See Condition A. (2) for Instream monitoring requirements.
2. The monthly average effluent BOD5 and TSS concentrations shall not exceed 15% of the respective influent
value (85% removal).
3. Limit and/or monitoring applies only when chlorine is added to treatment system.
4. The daily effluent dissolved oxygen concentration shall not be less than 6.0 mg/L.
5. The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
6. Refer to Special Condition A. (4) for Total Nitrogen and Total Phosphorus Loading Calculations.
7. Mercury samples shall be analyzed using EPA Method 1631E.
8. See Special Condition A. (7).
9. Chronic Toxicity (Ceriodaphnia) at 90%; Feb., May, Aug., and Nov.; refer to Special Condition A. (6).
There shall be no discharge of floating solids or visible foam in other than trace amounts.
A. (2) INSTREAM MONITORING REQUIREMENTS
Beginning upon the permit effective date and lasting until expiration, the Permittee shall monitor instream
conditions as specified below':
INSTREAM
CHARACTERISTICS
MONITORING REQUIREMENTS
Measurement Frequency
Sample Type
Sample Location
Dissolved Oxygen
3/Week (June -September)
Grab
Upstream, D1, D2
Weekly (October -May)
Temperature
3/Week (June -September)
Grab
Upstream, D1, D2
Weekly (October -May)
Conductivity
3/Week (June -September)
Grab
Upstream, D1, D2
Weekly (October -May)
Fecal Coliform
3/Week (June -September)
Grab
Upstream, D1, D2
Weekly (October -May)
PH
3/Week (June -September)
Grab
Upstream, D1, D2
Weekly (October -May)
Total Phosphorus
Weekly (June -September) 3
Grab
Upstream, D1, D2
PO4
Weekly (June -September) 3
Grab
Upstream, D1, D2
TKN
Weekly (June -September) 3
Grab
Upstream, D1, D2
NO2 + NO3
Weekly (June -September) 3
Grab
Upstream. D1, D2
NH3 as N
Weekly (June -September) 3
Grab
Upstream, D1, D2
Notes:
1. As a participant in the Upper Cape Fear River Basin Association, the instream monitoring requirements as
stated above are waived. Should your membership in the association be terminated, you shall notify the
Division immediately and the instream monitoring requirements specified in your permit shall be reinstated.
2. Upstream = at NCSR 1102. D1 = Downstream at NCSR 1100. D2 = Downstream at NCSR 1732.
3. Samples shall be collected during June -September only.

Permit NC002051
A. (3) NUTRIENT MONITORING RE -OPENER
Pursuant to N.C. Gen. Stat. Section 143-215.1 and the implementing rules found in Title 15A of the
North Carolina Administrative Code, Subchapter 2H, specifically, 15A NCAC 2H.0112(b)(1) and
2H.0114(a), and Part II, Sections B-12 and B-13 of this Permit, the Director of DWQ may reopen this
permit to require supplemental nutrient monitoring of the discharge. The additional monitoring will be
to support water quality modeling efforts within the Cape Fear River Basin, and shall be consistent with
a monitoring plan developed jointly by the Division and affected stakeholders.
A. (4) CALCULATION OF MASS LOADS
a. The permitte shall calculate monthly and annual TN (or TP) loads as follows:
i. Monthly TN (or TP) Loads = TN (or TP) x TMF x 8.34
Where:
TN (or TP) = the average Total Nitrogen (or Total Phosphorus) concentration (mg/L) of the
composite samples collected during the month.
TMF = the total monthly flow of wastewater discharged during the month (MG/mo)
8.34 = conversion factor, from (mg/L x MG) to pounds
ii. Annual TN (or TP) Load (Ib/yr) = Sum of 12 monthly TN (or TP) Loads for calendar year.
b. The permitte shall report monthly total nitrogen and total phosphorus results (mg/L and
lb/mo) in the appropriate discharge monitoring report for each month and shall report each
year's results (lb/yr) with the December report for that year.
A. (5) REUSE OF TREATMENT PLANT EFFLUENT
The effluent from the Durham County Triangle WWTP is authorized for onsite reuse subject to the
following conditions:
• The reuse water will be used onsite, within the fenced perimeter of the wastewater treatment plant
with controlled public access, and for very specific internal uses (i.e., restrooms, I-IVAC system, and
vehicle washdown).
■ The reuse water will be used by plant personnel who are trained and knowledgeable about reuse
water.
• An RPZ device will be required onsite to protect the potable water supply.
• A water meter will be installed on the reuse line to monitor usage.
■ No runoff shall occur from the vehicle washdown area.
■ Reuse piping valves will be properly labeled and locking.

Permit NC002605 1
A. (6) QUARTERLY CHRONIC TOXICITY PERMIT LIMIT
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant
mortality to Ceriodaphnia dubia at an effluent concentration of 90%.
The permit holder shall perform at a minimum, quarterlu monitoring using test procedures outlined in
the "North Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised February 1998, or
subsequent versions or "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure"
(Revised -February 1998) or subsequent versions. The tests will be performed during the months of
February, May, August, and November. Effluent sampling for this testing shall be performed at the
NPDES permitted final effluent discharge below all treatment processes.
If the test procedure performed as the first test of any single quarter results in a failure or ChV
below the permit limit, then multiple -concentration testing shall be performed at a minimum, in
each of the two following months as described in "North Carolina Phase II Chronic Whole Effluent
Toxicity Test Procedure" (Revised -February 1998) or subsequent versions.
The chronic value for multiple concentration tests will be determined using the geometric mean of the
highest concentration having no detectable impairment of reproduction or survival and the lowest
concentration that does have a detectable impairment of reproduction or survival. The definition of
"detectable impairment," collection methods, exposure regimes, and further statistical methods are
specified in the "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -
February 1998) or subsequent versions.
All toxicity testing results required as part of this permit condition will be entered on the Effluent
Discharge Monitoring Form (MR-1) for the months in which tests were performed, using the parameter
code TGP3B for the pass/fail results and THP3B for the Chronic Value. Additionally, DWQ Form AT-3
(original) is to be sent to the following address:
Attention: North Carolina Division of Water Quality
Environmental Sciences Section
1621 Mail Service Center
Raleigh, North Carolina 27699-1621
Completed Aquatic Toxicity Test Forms shall be filed with the Environmental Sciences Branch no later
than 30 days after the end of the reporting period for which the report is made.
Test data shall be complete, accurate, include all supporting chemical/physical measurements and all
concentration/response data, and be certified by laboratory supervisor and ORC or approved designate
signature. Total residual chlorine of the effluent toxicity sample must be measured and reported if
chlorine is employed for disinfection of the waste stream.
Should there be no discharge of flow from the facility during a month in which toxicity monitoring is
required. the permittee will complete the information located at the top of the aquatic toxicity (AT) test
form indicating the facility name, permit number, pipe number, county, and the month/year of the
report with the notation of "No Flow" in the comment area of the form. The report shall be submitted to
the Environmental Sciences Branch at the address cited above.
Should the permittee fail to monitor during a month in which toxicity monitoring is required, monitoring
will be required during the following month. Should any test data from this monitoring requirement or
tests performed by the North Carolina Division of Water Quality 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, minimum control organism reproduction, and appropriate environmental controls,
shall constitute an invalid test and will require immediate follow-up testing to be completed no later
than the last day of the month following the month of the initial monitoring.

Permit NC0026451
A. (7) EFFLUENT POLLUTANT SCAN
The Permittee shall perform an annual Effluent Pollutant Scan for all parameters listed in the attached table. The
analytical methods shall be in accordance with 40 CFR Part 136 and shall be sufficiently sensitive to
determine whether parameters are present in concentrations greater than applicable standards and
criteria. Samples shall represent seasonal variations. Unless otherwise indicated, metals shall be
analyzed as "total recoverable."
Ammonia (as N)
Chlorine (total residual, TRC)
Dissolved oxygen
Nitrate/Nitrite
Kjeldahl nitrogen
Oil and grease
Phosphorus
Total dissolved solids
Hardness
Antimony
Arsenic
Beryllium
Cadmium
Chromium
Copper
Lead
Mercury*
Nickel
Selenium
Silver
Thallium
Zinc
Cyanide
Total phenolic compounds
Volatile organic compounds:
Acrolein
Acrylonitrile
Benzene
Bromoform
Carbon tetrachloride
Chlorobenzene
Chlorodibromomethane
Chloroethane
2-chloroethylvinyl ether
Chloroform
Dichlorobromomethane
1, 1 -dichloroethane
1,2-dichloroethane
Trans- 1 ,2 -dichloroethylene
1.1 -dichloroethylene
1 ,2 -dichloropropane
1,3-dichloropropylene
Ethylbenzene
Methyl bromide
Methyl chloride
Methylene chloride
1,1,2,2-tetrachloroethane
Tetrachloroethylene
Toluene
1,1,1-trichloroethane
1,1,2-trichloroethane
Trichloroethylene
Vinyl chloride
Acid -extractable compounds:
P-chloro-m-cresol
2-chlorophenol
2,4-dichlorophenol
2,4-dimethylphenol
4,6-dinitro-o-cresol
2,4-dinitrophenol
2-nitrophenol
4-nitrophenol
Pentachlorophenol
Phenol
2, 4, 6- tric h l orophen of
Base -neutral compounds:
Acenaphthene
Acenaphthylene
Anthracene
Benzidine
Benzo(a)anthracene
Benzo(a)pyrene
3,4 benzofluoranthene
Benzo(ghi)perylene
Benzo(k)fluoranthene
Bis (2-chloroethoxy) methane
Bis (2-chloroethyl) ether
Bis (2-chloroisopropyl) ether
Bis (2-ethylhexyl) phthalate
4-bromophenyl phenyl ether
Butyl benzyl phthalate
2-chloronaphthalene
4-chlorophenyl phenyl ether
Chrysene
Di-n-butyl phthalate
Di-n-octyl phthalate
Dibenzo(a, h)anthracene
1,2-dichlorobenzene
1,3-dichlorobenzene
1,4-dichlorobenzene
3,3-dichlorobenzidine
Diethyl phthalate
Dimethyl phthalate
2,4-dinitrotoluene
2,6-dinitrotoluene
1 ,2-diphenylhydrazine
Fluoranthene
Fluorene
Hexachlorobenzene
Hexachlorobutadiene
Hexachlorocyclo-pentadiene
Hexachloroethane
Indeno(1,2,3-cd)pyrene
Isophorone
Naphthalene
Nitrobenzene
N-nitrosodi-n-propylamine
N-nitrosodimethylamine
N-nitrosodiphenylamine
Phenanthrene
Pyrene
1 ,2,4-trichlorobenzene
Test results shall be reported to the Division in DWQ Form- A MR-PPA1 or in a form approved by the
Director within 90 days of sampling. The report shall be submitted to the following address:
NC DENR / DWQ / Central Files, 1617 Mail Service Center, Raleigh, North Carolina 27699-1617.
*Mercury samples shall be analyzed using EPA Method 1631E.

DENR/DWQ
FACT SHEET FOR NPDES PERMIT DEVELOPMENT
NPDES No. NC0026051
Facility Information
Applicant/Facility Name:
Durham County Triangle WWTP
Applicant Address:
120 Parrish Street, Suite 110 Durham, NC27701
Facility Address:
5926 NC Highway 55 East, Durham, North Carolina 27713
Permitted Flow
12.0 MGD
Type of Waste:
Domestic (70%) and industrial (30%) with pretreatment program
Facility/Permit Status:
Class IV /Active; Renewal
County:
Durham County
Miscellaneous
Receiving Stream:
Northeast Creek
Regional Office:
Raleigh (RRO)
Stream Classification:
WS-IV NSW
State Grid / USGS Quad:
D23NW/SWDurham
303(d) Listed?
Yes
Permit Writer:
Teresa Rodriguez
Subbasin:
03-06-05
Date:
May 31, 2006
Drainage Area (mi2):
18
..',
Lat. 35° 52' 51" N Long. 78° 53' 50" W
7Q10 (cfs)
0
30Q2 (cfs)
0.9"=
Average Flow (cfs):
20.0
IWC (%):
100%
BACKGROUND
The Durham County Triangle WWTP (Class IV) has a permitted flow of 12.0 MGD. The permit
was renewed in May 2002 for 6.0 MGD with authorization to expand to 12.0 MGD. The plant
expansion/upgrade was completed in June 2005. The Permittee submitted Standard Form A on
November 1, 2005 in order to request renewal of the permit.
Durham County has a full pretreatment program (15 Sills) with the Division of Water Quality's
Pretreatment Unit and will continue to implement this program in the new permit term. The
most recent staff report from the Fayetteville Regional Office (June 1, 2001) recommends
renewal of the NPDES permit. The facility has not requested any changes to the permit.
Instream Monitoring, Verification of Existing Conditions and DMR Data Review
This facility discharges to Northeast Creek in subbasin 03-06-05 in the Cape Fear River Basin.
The receiving stream is classified WS-IV NSW at this point. Northeast Creek is listed on the
2002-303(d) list as impaired for aquatic life due to turbidity and for recreation due to fecal
coliform. Since the new plant started operations in June 2005 DMR data was reviewed for the
period of June 2005 to March 2006. Flow averaged 4.08 MGD, BOD averaged 3.9 mg/L, TSS
averaged 2.0 mg/L, ammonia averaged 0.26 mg/L, total nitrogen averaged 3.18 mg/L and total
phosphorus averaged 0.35 mg/L. No limits violations were reported for this time period. Durham
County is a member of the Upper Cape Fear River Coalition and instream monitoring
requirements of the NPDES permit are therefore waived as long as the membership in the
association continues.
Correspondence
The Raleigh Regional Office (RRO) conducted several site visits during this permit term to
evaluate compliance. A Staff Report was also prepared in conjunction with the permit renewal.
RRO finds the facility to be in compliance with the NPDES permit and recommends renewal.
Fact Sheet
NPDES NC0026051 Renewal
Page 1

= The facility has received no Notices of Violation (NOVs) or enforcement actions in the past two
years, and has been in compliance with its toxicity limit during this permit term with the
exception of one failure in January 2003, which was passed the following month.
PERMITTING STRATEGY
Waste Load Allocation (WLA)
The Division prepared the last WLA in 1995. Previous and current effluent limits were based on
guidelines and water quality standards. The Division has judged previous parameters and limits
to be appropriate for renewal with some exceptions. Changes to toxicant monitoring are
discussed in the Reasonable Potential Analysis section. In addition, an annual pollutant scan will
be added such that the Permittee can collect the necessary data required by EPA Form 2A
throughout the permit term. This condition is now standard on all major municipal permits in
North Carolina.
Reasonable Potential Analysis (RPA)
The Division conducted a reasonable potential analyses to determine the reasonable potential for
toxicants to be discharged by this facility, based on DMR data from June 2005-March 2006.
Calculations included parameters listed in the previous permit and pre-treatment documents to
include: arsenic, cadmium, chromium, chloride, cyanide, fluoride, lead, mercury, molybdenum,
nickel, silver, selenium, copper, and zinc. Results suggest no reasonable potential for the facility
to discharge arsenic, cadmium, chromium, cyanide, lead, mercury, molybdenum, chloride,
selenium or silver. Copper and zinc show reasonable potential, but are action level standards and
the facility shows no toxicity problems, so monitoring only will remain in the permit. Fluoride
showed reasonable potential. A weekly average limit of 1800 µg/L will be implemented for
fluoride.
Cape Fear Nutrient Permitting strategy
For the 2006 permit renewal cycle the Division developed a permitting strategy to address
nutrient concerns in the Cape Fear River Basin. This strategy is being applied at permit renewal
to existing discharges on the basin. The strategy calls for additional nutrient monitoring and
reporting to support the efforts of the Modeling and TMDL Unit in developing special studies
and TMDL projects. Dischargers in the Jordan Lake watershed will monitor TN and TP 3 times
per week, report nitrogen species, and report TN and TP as both concentration and mass loads.
The permit also includes a re -opener special condition. In the event that the Environmental
Management Commission adopts a nutrient management strategy or the EPA approves a TMDL
in the coming permit term, the condition allows the Division to re -open affected permits to set
nutrient limits and related conditions accordingly.
SUMMARY OF PROPOSED CHANGES
In keeping with Division policies, the following will be incorporated into the permit:
• Remove chloride limit; reduce monitoring frequency to monthly
• Weekly average limit for fluoride
• Annual effluent pollutant scan
• Nutrient monitoring as per Cape Fear Nutrient Permitting Strategy
Fact Sheet
NPDES NC002605 1 Renewal
Page 2

PROPOSED SCHEDULE FOR PERMIT ISSUANCE
Draft Permit to Public Notice:
Permit Scheduled to Issue:
NPDES DIVISION CONTACT
June 7, 2006
July 31, 2006
If you have questions regarding any of the above information or on the attached permit, please contact
Teresa Rodriguez at [phone] ext. 553.
NAME: 1;61-- / / DATE: ((/ cV/Oo,'
REGIONAL OFFICE COMMENTS
NAME: DATE:
SUPERVISOR: DATE:
Fact Sheet
NPDES NC0026051 Renewal
Page 3

REASONABLE POTENTIAL ANALYSIS
Durham County Triangle WWTP
NC0026051
Time Period 0
Ow (MGD) 12
7010S (cfs) 0
7010W (cfs) 0.5
3002 (cfs) 0.9
Avg. Stream Flow, QA (cfs) 20
Reeving Stream Northeast Creek
WWTP Class IV
IWC (%) @ 7010S 100
@ 7010W 97.382
@ 3002 95.385
QA 48.187
Stream Class WS-IV NSW
Outfall 001
Caw=12MGD
PARAMETER
TYPE
(1)
STANDARDS &
CRITERIA (2)
POL
Units
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
NC was % FAY /
Chronic Acute
n itDet Max Pred Cw Allowable Cw
Arsenic
NC
50
ug/L
0 0
WA
Acute: N/A
_ _ —
----
Chronic: 50
All samples BDL
-----------------------------------
Cadmium
NC
2 15
ugrL
0 0
N/A
Acute: 15
_ -----
Chronic: 2
All samples BDL
-----------------------------------
Chromium
NC
50 1,022
ug/L
0 0
N/A
Acute: 1,022
_ _ ----
Chronic: -
NI samples BD_
-----------------------------------
Copper
NC
7 AL 7.3
ug/L
10 10
Note: n<12
Limited data
31.9
set
Acute: 7
Chronic: 7 --
RP exists, but AL standard and no toxicity problems
-----------------•—•-----------•—•—
Cyanide
NC
5 N 22
10
ug/L
0 0
N/A
Acute: 22
_ _ _
Chronic: 5
All samples BDL
Fluoride
NC
1,800
ug/L
9 9
Note: n<12
Limited data
1,848.0
set
Acute: N/A
Chronic: 1,800 —
---------------•-----------------
Lead
NC
25 N 33.8
ug/L
0 0
WA
Acute: 34
_
Chronic:—'-25'—
All samples BDL _________________ -_____
---'—'---'
Mercury
NC
12
nglL
43 22
11.4400
Acute: N/A
No RP, remove limit, continue monitoring
-----------------------------------
Molybdenum
A
3,500
ug/L
10 10
Note: n<12
Limited data
121.7
set
Acute: N/A
___
Chronic: 3,669 —
No RP. -_______
----_____ --------__________
Nickel
NC
68 261
ug/L
10 3 I 69.8
Note: n<12
Limited data set
Acute: 261
_
Chronic:—_-88 _—
. No RP
Chloride
NC
250
ug/L
44 44
128.8
Acute: N/A
_ _ _ _ _ _ --
Chronic: 250
No RP; remove limit but maintain monitoring.
—'—..._._------'---------'—'—'—'---
Selenium
NC
5.0 56
ug/L
10 1
Note: n<12---------------------•
Limited data
3.5
set
Acute: 56
No RP
—•-----------
Silver
NC
0.06 AL 1.23
ug/L
0 0
N/A
Acute: 1
_ _
_—'—--
Chronic: _
All samples BDL
—'—'---'-----'—'—'-----------------
Zinc
NC
50 AL 67
ug/L
10 10
Note: n<12
Limited data
293.4
set
Acute: 67
Chronic: 50 --
RP exists, but AL standard and no toxicity problems
-----------------•-----------------
Legend:
C = Carcinogenic
NC = Non -carcinogenic
A = Aesthetic
" Freshwater Discharge
npdes rpa 2004031.xts, rpa
5/31/2006

REASONABLE POTENTIAL ANALYSIS
Copper
Cyanide
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
199
200
Date
Data
4
12
12
10
4
6
5
6
4
3
BDL=1/2DL
4.0
12.0
12.0
10.0
4.0
6.0
5.0
6.0
4.0
3.0
Results
Std Dev.
Mean
C.V.
n
Mult Factor =
Max. Value
Max. Pred Cw
3.4383
6.6000
0.5210
10
2.6600
12.0 ug/L
31.9 ug/L
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32!
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56y
57
58
59
60
199
200
Date
Data
•-
sy
,fi'ti
BDL=1/2DL
Results
Std Dev.
Mean
C.V.
n
Mult Factor =
Max. Value
Max. Pred Cw
NO DATA
NO DATA
NO DATA
0
N/A
0.0 ug/L
N/A ug/L
Jun-2005
Jul-2005
Aug-2005
Sep-2005
Oct-2005
Nov-2005
Dec-2005
Jan-2006
Feb-2006
Mar-2006
Apr-2006
?.
-3-
npdes rpa 2004031.xls, data
5/31/2006

REASONABLE POTENTIAL ANALYSIS
Fluoride
Lead
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
199
200
Date Data
1020
1150
1200
1200
1100
800
900
700
700
BDL=1/2DL
1020.0
1150.0
1200.0
1200.0
1100.0
800.0
900.0
700.0
700.0
Results
Std Dev.
Mean
C.V.
n
Mult Factor =
Max. Value
Max. Pred Cw
205.2505
974.4444
0.2106
9
1.5400
1200.0 ug/L
1848.0 ug/L
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
199
200
Date
Data
BDL=1/2DL
Results
Std Dev.
Mean
C.V.
n
Mult Factor =
Max. Value
Max. Pred Cw
NO DATA
NO DATA
NO DATA
0
N/A
0.0 ug/L
N/A ug/L
Jul-2005
Aug-2005
Sep-2005
Oct-2005
Nov-2005
Dec-2005
Jan-2006
Feb-2006
Mar-2006
Apr-2006
May-2006
-4-
npdes rpa 2004031.xis, data
5/31/2006

REASONABLE POTENTIAL ANALYSIS
Mercury
Molybdenum
Date Data
BDL=1/2DL
Results
Date Data
BDL=112DL
Results
1
Jun-2005
2.11
2.1
Std Dev.
1.0526
1
Jun-2005
64
64.0
Std Dev.
15.26
2
2.85
2.9
Mean
1.2153
2
Jul-2005
64
64.0
Mean
57.00
3
2.17
2.2
C.V.
0.8661
3
Aug-2005
56
56.0
C.V.
0.27
4
1.32
1.3
n
43
4
Sep-2005
72
72.0
n
10
5
2.12
2.1
5
Oct-2005
62
62.0
6
Jul-2005
1.88
1.9
Mult Factor =
2.20
6
Nov-2005
47
47.0
Mult Factor =
1.6900
7
1.28
1.3
Max. Value
5.2 ng/L
7
Dec-2005
36
36.0
Max. Value
72.0 ug/L
8
5.2
5.2
Max. Pred Cw
11.4 ng/L
8
Jan-2006
28
28.0
Max. Pred Cw
121.7 ug/L
9
1.8
1.8
9
Feb-2006
71.0
71.0
10
Aug.-2005
1.9
1.9
10
Mar-2006
70.0
70.0
11
1.2
1.2
11
Apr-2006
12
<
1.0
0.5
12
May-2006
13
<
1.0
0.5
13
14
Sep-2005
<
1.0
0.5
14
15
4.7
4.7
15
16
<
1.0
0.5
16
17
<
1.0
0.5
17
18
Oct-2005
<
1.0
0.5
18
19
1.8
1.8
19
20
<
1.0
0.5
20
21
<
1.0
0.5
21
22
<
1.0
0.5
22
23
Nov-2005
<
1.0
0.5
23
24
<
1.0
0.5
24
25
1.3
1.3
25
26
Dec-2005
<
1.0
0.5
26
27
1.6
1.6
27
28
1.0
1.0
28
29
1.8
1.8
29
30
<
1.0
0.5
30
31
Jan-2006
1.0
1.0
31
32
<
1.0
0.5
32
33
1.0
1.0
33
34
<
1.0
0.5
34
35
Feb-2006
<
1.0
0.5
35
36
<
1.0
0.5
36
37
1.0
1.0
37
38
1.4
1.4
38
39
Mar-2006
<
1.0
0.5
39
40
<
1.0
0.5
40
41
<
1.0
0.5
41
42
<
1.0
0.5
42
43
1.4
1.4
43
44
44
45
45
46
46
47
47
48
48
49
49
50
50
51
51
52
52
53
53
54
54
55
55
56
56
57
57
58
58
59
59
60
60
199
199
200
200
-5-
npdes rpa 2004031.xls, data
5/31/2006

REASONABLE POTENTIAL ANALYSIS
Nickel
Chloride
Date
Data
BDL=1/2DL
Results
Date
Data
BDL=1/2DL
Results
1
Jun-2005
<
5
2 5
Std Dev.
4.1369
1
Jun-2005
92
92.0
Std Dev.
10.5979
2
Jul-2005
<
10
5.0
Mean
4.8500
2
86
86.0
Mean
93.4000
3
Aug-2005
16
16.0
C.V.
0.8530
3
84
84.0
C.V.
0.1135
4
Sep-2005
<
10
5.0
n
10
4
92
92.0
n
44
5
Oct-2005
6
6.0
5
Jul-2005
85
85.0
6
Nov-2005
<
5
2.5
Mull Factor =
4.3600
6
73
73.0
MuIt Factor =
1.1300
7
Dec-2005
<
5
2.5
Max. Value
16.0 ug/L
7
81
81.0
Max. Value
114.0 ug/L
8
Jan-2006
<
5
2.5
Max. Pred Cw
69.8 ug/L
8
76
76.0
Max. Pred Cw
128.8 ug/L
9
Feb-2006
<
5
2.5
9
Aug-2005
85
85.0
10
Mar-2006
4
4.0
10
69
68.7
11
Apr-2006
11
81
81.0
12
May-2006
12
79
78.8
13
13
84
84.2
14
14
Sep-2005
108
108.0
15
15
102
102.0
16
16
95
95.4
17
17
96
96.0
18
18
91
90.5
19
19
109
109.0
20
20
Oct-2005
99
99.0
21
21
87
87.0
22
22
90
90.0
23
23
93
93.0
24
24
105
105.0
25
25
Nov-2005
94
94.0
26
26
108
108.0
27
27
97
97.0
28
28
87
87.0
29
29
Dec-2005
109
109.0
30
30
92
92.0
31
31
88
88.0
32
32
103
103.0
33
33
Jan-2006
114
114.0
34
34
98
98.0
35
35
100
100.0
36
36
81
81.0
37
37
Feb-2006
94
94.0
38
38
96
96.0
39
39
106
106.0
40
40
Mar-2006
92
92.0
41
41
107
107.0
42
42
100
100.0
43
43
106
106 0
44
44
96
96.0
45
45
46
46
47
47
48
48
49
49
50
50
51
51
52
52
53
53
54
54
55
55
56
56
57
57
58
58
59
59
60
60
199
I
199
200
200
-6-
npdes rpa 2004031 xls. data
5/31 /2006

REASONABLE POTENTIAL ANALYSIS
Selenium
Silver
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
199
200
Date Data
BDL=1/2DL
1.0
1.0
2.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
Results
Std Dev.
Mean
C.V.
n
Mult Factor =
Max. Value
Max. Pred Cw
0.3162
1.1000
0.2875
10
1.7600
2.0 ug/L
3.5 ug/L
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
199
200
Date
Data
BDL=1/2DL
Results
Std Dev.
Mean
C.V.
n
Mult Factor =
Max. Value
Max. Pred Cw
NO DATA
NO DATA
NO DATA
0
N/A
0.0 ug/L
N/A ug/L
Jul-2005
Aug-2005
Sep-2005
Oct-2005
Nov-2005
Dec-2005
Jan-2006
Feb-2006
Mar-2006
Apr-2006
May-2006
<
<
<
<
<
<
<
<
<
2
2
2
2
2
2
2
2
2
2
1
2
3
4
5
6
7
8
9
-7-
npdes rpa 2004031.xls, data
5/31/2006

REASONABLE POTENTIAL ANALYSIS
Zinc
Date Data BDL=1/2DL Results
1 Jun-2005 163 163.0 Std Dev. 33.9470
2 Jul-2005 148 148.0 Mean 137.2000
3 Aug-2005 98 98.0 C.V. 0.2474
4 Sep-2005 174 174.0 n 10
5 Oct-2005 180 180.0
6 Nov-2005 173 173.0 Mult Factor = 1.6300
7 Dec-2005 124 124.0 Max. Value 180.0 ug/L
8 Jan-2006 102 102.0 Max. Pred Cw 293.4 ug/L
9 Feb-2006 98 98.0
10 Mar-2006 112 112.0
11 Apr-2006
12 May-2006
13 Jun-2006
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
199
200
•8-
nudes rpa 2004031.xis. data
5/31/2006

•,
tEO ST41
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY
zw REGION 4
�\�� r ATLANTA FEDERAL CENTER
\or 61 FORSYTH STREET
�rq< FROSF'� ATLANTA, GEORGIA 30303-8960
JUL 1 0 as
Ms. Teresa Rodriguez
North Carolina Department of Environment and
Natural Resources
Division of Water Quality
NPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
D
JUL 1 2 2006
DENR - WATER QUALITY
POINT SOURCE BRANCH
SUBJ: Draft NPDES Permit
Durham Co. Triangle WWTP - NPDES No. NC0026051
Dear Ms. Rodriguez:
In accordance with the EPA/NCDENR MOA, we have completed review of the draft
permit referenced above and have no comments. We request that we be afforded an additional
review opportunity only if significant changes are made to the draft permit prior to issuance, or if
significant comments objecting to the draft permit are received. Otherwise, please send us one
copy of the final permit when issued.
If you have any questions, please call me at [phone].
Sincerely,
'ham k kk-\edtik
Marshall Hyatt, Environmental Scientist
Permits, Grants, and Technical Assistance Branch
Water Management Division
Internet Address (URL) • http://www.epa.gov
Recycled/Recyclable • Printed with Vegetable 01 Based Inks on Recycled Paper (Minimum 30% Postconsumer)

COUNTY OF DURHAM
ENGINEERING DEPARTMENT
July 5, 2006
Ms. Teresa Rodriguez
NC Division of Water Quality
1617 Mail Service Center
Raleigh, N.C. 27699-1617
Re: Responses to Draft NPDES Permit NC0026051
Durham County Triangle WWTP, Durham County, N.C.
Dear Ms. Rodriguez:
In response to the draft permit, please consider the following comments and
recommendations:
1. The permit cover letter indicates "Data for fluoride showed reasonable potential
to exceed the water quality standard" (1.8 mg/L). Per Section A. (1) Effluent
Limitations and Monitoring Requirements, NCDENR proposes that weekly
fluoride grab samples be collected. Per our review, the data does not show
reasonable potential to exceed the water quality standard. As such, it is requested
that this permit limit be eliminated or reduced to a monthly composite sample.
Should the weekly sample be retained, it is recommended that the sampling be
composite.
2. The last item mentioned in the cover letter refers to the "re -opener" special
condition regarding implementing more stringent nutrient limits in the event the
EMC were to adopt a nutrient management strategy for Jordan Lake or EPA
approves TMDL nutrient limits. While this language may be necessary for other
NPDES permits in this watershed, one must remember that Durham County was
pro -active in this regard by making the difficult decision to install a new, state-of-
the-art 5-stage BNR process that allows us to reduce effluent nutrient
concentrations to the best practicable technological limits. Please consider our
efforts when allocating nutrient loads.
3. Under Item #1 (description of treatment components) please add the following
unit processes:
a. Waste and return activated sludge pumping system
b. Methanol storage & feed system
c. Potassium hydroxide storage & feed system
d. Sodium hypochlorite storage & feed system
120 E. Parrish Street, Law Bldg., 1st Floor, Durham, N.C. 27701 [phone] Fax [phone]
Equal Employment/Affirmative Action Employer

Additionally, the reference to mechanical bar screens should be changed to
mechanical fine screens.
4. The superscript #2 which follows "chloroform" is incorrect. The correct note
reference should be #3. ,1
5. For approximately two years, the discharge has been compliant for the weekly
mercury sampling events. The permit limit is 12 ng/L. The highest effluent
concentration recorded was 6.91 ng/L. Though the discharge was compliant, the
requirement for weekly sampling remains the same. Please consider reducing the
sampling frequency from weekly to monthly.
6. The new permit increases the effluent total nitrogen sampling frequency from
once per week to three times per week. While this requirement adds cost to the
operating budget, this additional data may be used to populate the next Jordan
Lake model.
7. The new permit requires an annual pollutant scan. Three were performed as part
of the NPDES permit renewal application. The pollutants detected above
detection limits were not atypical. While this requirement adds cost to the
operating budget, it is an acceptable cost when one considers that this data could
potentially identify the discharge of a pollutant not sampled as part of the long
term monitoring plan.
Thank you for this opportunity to comment on the draft NPDES permit. Please feel free
to contact either Chuck Hill or me if you have any questions or require additional
information.
Sincerely
Glen E. Whisler, P.E.
County Engineer
cc: Chuck Hill, F.E., Utility Division Manager
Alan W. Klimek, P.E., NC Division of Water Quality
GEW/kt

State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
Michael F. Easley, Governor
William G. Ross, Jr., Secretary
Alan W. Klimek, P.E., Director
MEMORANDUM
To:
June 7, 2006
Michael Douglas
NC DENR / DEH / Regional Engineer
Raleigh Regional Office
From: Teresa Rodriguez
Point Source Branch
Subject: Review of Draft NPDES Permit NC0026051
Durham County Triangle WWTP
Durham County
A7A
NCDENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
Please indicate below your agency's position or viewpoint on the draft permit and return this form by July 14, 2006.
If you have any questions on the draft permit, please contact me at the telephone number or e-mail address listed at
the bottom of this page.
RESPONSE: (Check one)
7/7
Concur with the issuance of this permit provided the facility is operated and maintained properly, the stated effluent limits
are met prior to discharge, and the discharge does not contravene the designated water quality standards.
Concurs with issuance of the above permit, provided the following conditions axe met:
Opposes the issuance of the above permit, based on reasons stated below, or attached:
Signed1\AICkadL & 1 Date:
1617 Mail Service Center, Raleigh, North Carolina 27699-1617 919 733-5083, extension 363 (fax) 919 733-0719
VISIT US ON THE INTERNET @ http://h2o.enr.state.nc.us/NPDES [e-mail]

comments•on NC0026051, Durham Co. Triangle WWTP
•
• Subject: comments on NC0026051, Durham Co. Triangle WWTP
From: [e-mail]
Date: Mon, 19 Jun 2006 15:39:02 -0400
To: [e-mail]
1. the footnote for chloroform should be 3, not 2.
2. PH should be pH.
3. For the TN and TP effluent limits, the footnote should be 6, not 5.
4. re footnote 7, recommend specifying the method as 1631E.
1 of 1 7/10/2006 10:15 AM

06/08/2006 08:58 FAX [phone]
HERALD SUN CLASSIFIEDS 00001
r733-d'1 17
Jame (Primary) - N C i E N R
Start Date 6/12/200;
Stop Date 6/12/2006
Publication HE - He:ald Sun
Ad # 138897
Ad Sales Rep_ 04A - Jennifer Lloyd
PUBLIC NOTICE
STATE OF NORTH CAROLINA
ENVIRONMENTAL MANAGEMENT
CONiMISBIONFNPOEB u'6T
1817 MAIL SERVICE CENTER
RILLEIGH. NC 27886.1817
NOTIFICATION OF INTENT TO ISSUE A NPDES
WASTEWATER PERMIT
On 1>1e oasis of thorough stair review and aplk4-
don or NC General Statute 143.21, Public IOW 02-
600 and other lawful standard. and regutations
the North Carolina £nvlronmanUe Management
Commission proposes to Issue a National Potlu-
tent Discharge Elimination Syetern (NPDEB)
wwtswatir dlsienarge permit to the pereon(e) Met
ed below etrecVve a6 days from me pubbeh dam
of this notice.
Written mnrnettta regarding me proposed permit
wHHI be acoepted until 30 days idler the publrn
data of this notice. All oornntente r+otiNecl prior tc
that date are considered In the final determ
nations regardln the proposed permit. Trio DI.
rector or the NO or water Quasty may de-
cide to hold a public meeting ror the proposed
perrnR should the Dhealon receive a etgnrncern de-
ns d ptdJM Interest
cop of Sr draft permit and other supporting h-
formatlon on rile Lined to determine condition'
present 1n me draft permit are evalteN. upon re-
quest and payrnar t or trio coat or r•productbn.
Mall oommorrts endror ntqueeta ter Information tc
tho NC OMsbn or Water Quality at the above ad.
areas or cal the Polar Bourne Branch at (91733-
5063, extension 363. Please include the NPOEF
permit number (attached) In any communication.
Inteniezed persons may also vlsk the Division o'
Water Quality et 512 N. SshsburyBireet. Ralolgn,
NC 2760s-1148 between the hours or 6:00 a.m.
end 6:00 p.m to review vltbrmemnn on Me.
C)1ttyyorBurlington (P.O. Borlaas, Burlington, NC
27218-1358). has applied for renewal of NEVEE
pros[ number NGOO"Z387e for the South Burling.
ten WWTP. Tills permitted Tsc1174 dischargiii
treated wastewater to the Big Namence Creek r
the Cape Fear River Basin Some pararnetert
may be water quality limited which may atlleot N•
tune allocations In this portim
on of the Cape Fear
Rrusr B.
Durham rowdy, Triangle VINVTP, '0026031, hs!
applied for an FJPOES permit renewal. This fac6t
discharges to Northeast Creek In the Cape Fear
niter Beep. Currently BOO and *arts Ja are we..
ter quality limited. 'Rile dlecrwgs my enact Tu
tore dlsohergee In tees portion or the meshing
.dream.
The City of Durham, 101 City H.II Plaza Durham
NC 277 has spoiled for renewal of NPUE8 pen
rrh t NC00476e7 for Re South Durham Water Flacks
manor, Facwry In Dumam Coumy. Tnie psrmlaec
fee Pry discharges treated wastewater to an urr
nomad tributary to NOW Hope Creek In The Oepc
Fear River Basin Currency, BOO, ammonia nitro.
Gen, total ree+duet ohbrine, total phosphorus, ars
hotel nitrogen are water guetfcy llrnfftod The die
charge may affect Inure alocdbrw In this pdrtlor
or the watershed
HAS: June 12, 2005
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tk2

. Durham County Triangle WWTP
Subject: Durham County Triangle WWTP
Date: Tue, 24 Jan 2006 09:38:27 -0500
From: Dawn Jeffries <[e-mail]>
Organization: NC DENR DWQ
To: Barry Herzberg <[e-mail]>
Barry,
I just pulled out this NC0026051 to start working on the renewal. I see
that the last CEI was in June 2005 by you so I'm guessing this is one of
yours. I don't see a staff report, and I don't absolutely have to have
one, but I certainly value your input!
As I look at it, I see they've recently expanded the plant and I want to
make sure I get the renewal to correctly reflect what's current. I'm
also thinking about only looking at effluent data (for the RPA) since
June when the new plant came on-line, although I'm not sure what EPA
would say about that. Any thoughts?
I'll send you an e-copy of the draft well before I send it out to
notice, to give you time to review beforehand. This one won't go to
notice for a month or two.
Have a great day,
Dawn Jeffries
1 of 1 1/25/2006 10:59 AM

NPDES/Non-Discharge Permitting Unit Pretreatment Information Request Form
NPDES OR NONDISCHARGE PERMITTING UNIT COMPLETES THIS PART:
Date of Request 10/18/2005
COMMENTS TO PRETREATMENT UNIT: Permit
renewal time
Facility Durham County
Permit # NC0026051
Region RRO
Requestor Dawn Jeffries
Pretreatment A-F Towns- Dana Folley (ext. 523)
Contact G-M Towns- Jon Risgaard (ext. 580)
N-Z Towns- Deborah Gore (ext. 593)
PRETREATMENT UNIT COMPLETES THIS PART:
Status of Pretreatment Program (circle all that apply)
3) the facility has (or is developing) a Pretreatment Program
3a) is Full Program with LTMP
Flow Permitted MGD Actual MGD
Industrial 2.105 1.7844
STMP time frame:
most recent
Domestic N/A 3.4191
next cycle
AL
L
(S)
T
Pollutant
Check List
POC due to
NPDES/Non-
Discharge
Required
Required by
STMP
Frequency
V
at
LTMP
Frequency at
MP
Permit Limit
by EPA'
503 Sludge**
POC due to SIU"'
Site specific POC (Provide Explanation)""
effluent
effluent
BOD
X
4
Q M
TSS
X
4
Q M
NH3
X
4
Q M
Arsenic
X
4
Q M
,/
Cadmium
,/
X
4
Q M
j
Chromium
Ni
4
Q M
Ni
Copper
Ni
X
4
Q M
Cyanide
X
4
Q M
Ni
Lead
f
X
4
Q M
Mercury
X
X
4
Q M
Molybdenum
X
4
Q M
,/
Nickel
,/
X
4
Q M
Silver
X
4
Q M
Selenium
X
4
Q M
,/
Zinc
,/
X
4
Q M
Aluminum
X
4
Q M
Chloride
X
4
Q M
Fluoride
X
4
Q M
NO2 + NO3
X
4
Q M
Total Phosphorus
X
4
Q M
4
Q M
'Always in the LTMP
"Only in the LTMP if the POTW land applies sludge
***Only in LTMP while the SIU is connected to the POTW
"" Only in LTMP when the pollutant is a specific concern to the POTW (ex -Chlorides for a POTW who accepts Textile waste)
all LTMP/STMP effluent data
On D M RS?
Yes
Q=Quarterly
No (attach data)
M=Monthly
Comments: Data available on spreadsheet Jan'01 thru Dec'02, prior to plant expansion/upgrade. During
available in spreadsheet?
Yes No
construction from Jan'03 thru Jun'05 effluent frequency was semi-annual. Starting June'05 frequency
increased to 1/month.
version 10.!8103
NPDES Pretreatment.req-5.ds
Revised: August 4, 2000

LTMP June 2005
Parameter
Week of June 27
LTMP
Influent
Effluent
BOD
244
<2
COD
520
20
T S S
242
2
Aluminum
1.19
0.49
Arsenic
<.005
<.005
Cadmium
<.001
<.001
Chromium
0.005
<.005
Chloride
*
92
Copper
0.067
0.008
Cyanide
<.005
<.005
Fluoride
1.2
1.4
Lead
0.013
<.002
Mercury
*
2.12
Molybdenum
0.064
0.064
Nickel
0.012
<.005
Selenium
0.003
0.006
Silver
0.009
<.005
Zinc
0.348
0.173
Total Nitrogen
24.1
1.8
TKN
24.1
1.1
NO2 & NO3
<.5
0.7
NH3
30.2
<.1
Total Phos
3.8
0.3
* Additional Influent CI and Hg to be taken during July.

LTMP July 2005
Parameter
Week of July 22
LTMP
Influent
Effluent
BOD
228
<2
COD
535
14.5
TSS
226
1.9
Aluminum
0.902
0.266
Arsenic
<.005
<.005
Cadmium
<.001
<.005
Chromium
<.005
<.01
Chloride
71
81.1
Copper **
0.06
0.012
Cyanide
<.005
<.005
Fluoride
1.25
1.02
Lead
0.008
<.005
Mercury, ng/L
462
5.2
Molybdenum
0.078
0.064
Nickel
<.01
<.01
Selenium
<.002
<.002
Silver
0.014
<.01
Zinc **
0.389
0.148
Total Nitrogen
27.6
1.81
TKN
27.6
0.33
NO2 & NO3
<.02
1.48
NH3
26.4
<.02
Total Phos
7.16
0.19
* Additional Influent CI and Hg to be taken during calendar year.
** All results are from the week of 7/22 save Cu and Zn which were on 7/5.

LTMP August 2005
Parameter
Week of August 29
LTMP
Influent
Effluent
BOD
134
<2
COD
288
10.1
TSS
87
1
Aluminum
0.322
0.216
Arsenic
<.005
<.005
Cadmium
<.005
<.005
Chromium
<.01
<.01
Chloride"
92
84.2
Copper**
0.026
0.012
Cyanide
<.005
<.005
Fluoride
1.15
1.15
Lead
<.005
<.005
Molybdenum
0.044
0.056
Nickel
<.01
0.016
Selenium
<.002
<.002
Silver
<.01
<.01
Zinc**
0.135
0.098
Total Nitrogen
15.4
10.61
TKN
15.4
0.91
NO2 & NO3
<.02
9.7
NH3
21.8
<.02
Total Phos
3.98
0.2
* Additional Influent CI and Hg to be taken during calendar year.
** All results are from the week of 8/29 save Cu and Zn which were on 8/1 and eff. CI on 8/25.

LTMP September 2005
Parameter
Week of September 26
LTMP
Influent
Effluent
Basin
Sludge, mg/kg
BOD
90
<2
COD
442
16
TSS
110
1.2
Aluminum
0.602
0.441
72.1
Arsenic
<.005
<.005
0.006
3.14
Cadmium
<.005
<.005
<.005
<1.21
Chromium
<.01
<.01
0.052
28.7
Chloride**
115
109
103
788
Copper**
0.032
0.012
0.392
186
Cyanide
<.005
<.005
<.005
Fluoride
1.3
1.2
Lead
<.005
<.005
0.042
30.7
Mercury
281
<1 ng/L
1430
1390 ug/kg
Molybdenum
0.064
0.072
23.7
Nickel
<.01
<.01
0.043
19.3
Selenium
<.002
<.002
0.005
2.66
Silver
<.01
<.01
0.04
Zinc**
0.183
0.098
1.56
708
Total Nitrogen
41.2
3.56
TKN
41.2
1.95
NO2 & NO3
<.1
1.61
NH3
19.5
<.02
0.1
Total Phos
8.52
0.427
Percent Dry
Weight
20.30%
* Additional Influent CI and Hg to be taken during calendar year.
** All results are from the week of 9/26 save Cu and Zn which were on 9/6.

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COUNTY OF DURHAM
ENGINEERING DEPARTMENT
November 1, 2005
NbY -
Mr. Charles H. Weaver, Jr.
NCDENR/Division of Water Quality
Point Source Branch
1617 Mail Service Center
Raleigh, NC 27699-1617
Re: Renewal Application for Permit NC0026051 Triangle WWTP
Dear Mr. Weaver:
Durham County respectfully submits this permit renewal application for consideration. Since
the last permit issuance, we have, in essence, built a new plant. The new facility is capable of
removing nitrogen and phosphorous through biological processes, and can treat an average
daily flow of 12 MGD.
> The Influent Pumping Station (IPS) was designed with the intent of a more efficient
and less odorous removal of screenings and grit.
➢ Instead of using two extended aeration basins that could treat 6 MGD, the new facility
boasts three Biological Nutrient Removal (BNR) trains that doubled our treatment
capacity to 12 MGD. The new facility is geared to the removal of the nutrients Total
Nitrogen and Total Phosphorus in an effort to meet mandates prescribed by the State
and EPA. Previously, we could not treat for Total Nitrogen but the BNR System now
offers that capability. The previous configuration relied heavily on chemical
precipitation for the treatment of Total Phosphorus. The BNR system allows us the
benefit of treating biologically for Total Phosphorus thus decreasing our dependency
on chemicals. We are pleased to report that there has been a significant reduction in
the two parameters as well as Ammonia since the start up of the system.
> The number of clarifiers has doubled to four with an increase in the overall diameter
of each and treatment capacity.
120 E. Parrish Street, Law Bldg., 1st Floor, Durham, N.C. 27701 [phone] Fax [phone]
Equal Employment/Affirmative Action Employer

➢ There are now five sand filters instead of two. There is not only an increase in
treatment capacity, but it offers a maintenance bonus. The filters can be rotated
periodically and serviced more often without sacrificing run time.
> The chosen form of disinfection is Ultraviolet (UV) instead of chlorine. It allows for
more consistent disinfection and is exponentially safer for the operators.
> Finally, there is a serpentine chamber outfitted with multiple diffusers for post aeration
before discharge to the creek.
> The walls of the aforementioned structures were built above the one hundred year
flood plane. We think that this will help us maintain efficiencies during periods of
excessively high flow.
> Three (3) emergency generators have been installed that permit 100% coverage in the
event of an electrical failure.
The County is currently contracting with Bionomics for sludge removal. Each year, sludge is
removed from the lagoon, equivalent to or exceeding the amount produced during that year, as
anticipated in the Interim Biosolids Management Plan approved by the Division of Water
Quality June 10, 2002 (copy attached). This contract includes dredging from the lagoon,
dewatering on site, and hauling dewatered sludge to a composting facility permitted by the
state for this purpose. The County is not using land application for the disposal of sludge at
this time.
The County is proceeding with the design of sludge management facilities to produce a Class
A sludge within the next few years. The current schedule has this process on line in 2008.
The current lagoon will continue to be utilized and annual removals will continue until the
new processes are completed.
Sincerely,
4,0
Chuck Hill, P.E.
Utility Division Manager
Enclosure
cc: Glen E. Whisler, P.E., County Engineer
Adrienne Fancher, Project Manager — United Water
2

FACILITY NAME AND PERMIT NUMBER:
Triangle WWTP, NC0026051
PERMIT ACTION REQUESTED:
Renewal
RIVER BASIN:
Cape Fear
SUPPLEMENTAL APPLICATION INFORMATION
PART F. INDUSTRIAL USER DISCHARGES AND RCRA/CERCLA WASTES
All treatment works receiving discharges from significant industrial users or which receive RCRA,CERCLA, or other remedial wastes must
complete part F.
GENERAL INFORMATION:
F.1. Pretreatment
F.2. Number
industrial
a.
►1
of
users
Number
program. Does the treatment works have, or is subject to an approved pretreatment program?
Yes ❑ No
Significant Industrial Users (Sills) and Categorical Industrial Users (CIUs). Provide the number of each of the following types of
that discharge to the treatment works.
of non -categorical SIUs. 6
b. Number of CIUs. 9
SIGNIFICANT INDUSTRIAL USER INFORMATION:
Supply the following Information for each SIU. If more than one SIU discharges to the treatment works, copy questions F.3 through F.8 and
provide the information requested for each SIU.
F.3. Significant Industrial User Information. Provide the name and address of each SIU discharging to the treatment works. Submit additional pages
as necessary.
Name: Cintas
Mailing Address: 1003 Twin Creeks Court
Durham, NC 27703
F.4. Industrial Processes. Describe all the industrial processes that affect or contribute to the SIU's discharge.
Industrial Laundry Facility — Washing, drying, and sorting of garments. mats, and shop towels.
F.5. Principal Product(s) and Raw Material(s). Describe all of the principal processes and raw materials that affect or contribute to the SIU's
discharge.
Principal product(s): Laundered goods
Raw material(s): Water and detergents to clean garments, mats, and towels.
F.6. Flow Rate.
a. Process wastewater flow rate. Indicate the average daily volume of process wastewater
discharge into the collection system in gallons per day (gpd) and whether the discharge is
continuous or intermittent.
55,419 gpd (X continuous or intermittent)
b. Non -process wastewater flow rate. Indicate the average daily volume of non -process
wastewater flow discharged into the collection system in gallons per day (gpd) and
whether the discharge is continuous or intermittent.
gpd ( continuous or intermittent)
F.7. Pretreatment Standards. Indicate whether the SIU
a. Local limits
b. Categorical pretreatment standards
If subject to categorical pretreatment
is subject
I
standards,
to the following:
Yes ❑ No
❑ Yes ►/ No
which category and subcategory?

FACILITY NAME AND PERMIT NUMBER:
Triangle WWTP, NC0026051
PERMIT ACTION REQUESTED:
Renewal
RIVER BASIN:
Cape Fear
F.B. Problems at the Treatment Works Attributed to Waste Discharge by the SIU. Has the SIU
caused or contributed to any problems (e.g., upsets, interference) at the treatment works in the past
three years?
❑ Yes ® No If yes, describe each episode.
None of the 15 industries detailed in Part F has caused or contributed to any problems at the
treatment works in the past three years.

1 FACILITY NAME AND PERMIT NUMBER:
' ' Triangle WWTP, NC0026051
PERMIT ACTION REQUESTED:
Renewal
RIVER BASIN:
Cape Fear
SUPPLEMENTAL APPLICATION INFORMATION
PART F. INDUSTRIAL USER DISCHARGES ANI) RCRA/CERCLA WASTES
All treatment works receiving discharges from significant industrial users or which receive RCRA,CERCLA, or other remedial wastes must
complete part F.
GENERAL INFORMATION:
F.1. Pretreatment
F.2. Number
industrial
c.
of
users
Number
program. Does the treatment works have, or is subject to an approved pretreatment program?
Yes ❑ No
Significant Industrial Users (SIUs) and Categorical Industrial Users (CIUs). Provide the number of each of the following types of
that discharge to the treatment works.
of non -categorical SIUs. 6
d. Number of CIUs. 9
SIGNIFICANT INDUSTRIAL USER INFORMATION:
Supply the following information for each SIU. If more than one SIU discharges to the treatment works, copy questions F.3 through F.8 and
provide the information requested for each SIU.
F.3. Significant Industrial User Information. Provide the name and address of each SIU discharging to the treatment works. Submit additional pages
as necessary.
Name: Cree
Mailing Address: 4600 Silicon Drive
Durham, NC 27703
F.4. Industrial Processes. Describe all the industrial processes that affect or contribute to the SIU's discharge.
Semiconductor manufacturing
F.5. Principal Product(s) and Raw Material(s). Describe all of the principal processes and raw materials that affect or contribute to the SIU's
discharge.
Principal product(s):
Semiconductors for LCD (Liquid Crystal Display) and LED (Light Emitting
Diode
Raw material(s):Various etchants, photoresists, and strippers as well as some chemical compounds.
F.6. Flow Rate.
c. Process wastewater flow rate. Indicate the average daily volume of process wastewater
discharge into the collection system in gallons per day (gpd) and whether the discharge is
continuous or intermittent.
326,869 gpd (X continuous or intermittent)
d. Non -process wastewater flow rate. Indicate the average daily volume of non -process
wastewater flow discharged into the collection system in gallons per day (gpd) and
whether the discharge is continuous or intermittent.
gpd ( continuous or intermittent)
F.7. Pretreatment Standards. Indicate whether the SIU
a. Local limits
b. Categorical pretreatment standards
If subject to categorical pretreatment
469 A&B
is subject
/1
standards,
to the following:
Yes ❑ No
►1 Yes ❑ No
which category and subcategory?

FACILITY NAME AND PERMIT NUMBER:
Triangle WWTP, NC0026051
PERMIT ACTION REQUESTED:
Renewal
RIVER BASIN:
Cape Fear
SUPPLEMENTAL APPLICATION INFORMATION
PART F.INDUSTRIAL USER DISCHARGES AND RCRAICERCLA WASTES
All treatment works receiving discharges from significant industrial users or which receive RCRA,CERCLA, or other remedial wastes must
complete part F.
GENERAL INFORMATION:
F.1. Pretreatment program. Does the treatment works have, or is subject to an approved pretreatment program?
® Yes ❑ No
F.2. Number of Significant Industrial Users (SIUs) and Categorical Industrial Users (ClUs). Provide the number of each of the following types of
industrial users that discharge to the treatment works.
e. Number of non -categorical SIUs. 6
f. Number of CIUs. 9
SIGNIFICANT INDUSTRIAL USER INFORMATION:
Supply the following Information for each SIU. If more than one SIU discharges to the treatment works, copy questions F.3 through F.8 and
provide the information requested for each SIU.
F.3. Significant Industrial User Information. Provide the name and address of each SIU discharging to the treatment works. Submit additional pages
as necessary.
Name: Dupont
Mailing Address: PO Box 13999
Research Triangle Park, NC 27709
F.4. Industrial Processes. Describe all the industrial processes that affect or contribute to the SIU's discharge.
Customer service as well as R&D and limited scale up production for the electronics industry.
F.5. Principal Product(s) and Raw Material(s). Describe all of the principal processes and raw materials that affect or contribute to the SIU's
discharge.
Principal product(s): Electronics industry R&D
Raw material(s): Metallic powders, metal oxides, ceramic and glass, resin media, thinners, polymers,
monomers, inhibitors, nitric acid, sodium hydroxide, water
F.6. Flow Rate.
e. Process wastewater flow rate. Indicate the average daily volume of process wastewater
discharge into the collection system in gallons per day (gpd) and whether the discharge is
continuous or intermittent.
18,889 gpd (X continuous or intermittent)
f.Non-process wastewater flow rate. Indicate the average daily volume of non -process wastewater
flow discharged into the collection system in gallons per day (gpd) and whether the
discharge is continuous or intermittent.
gpd (
continuous or intermittent)
F.7. Pretreatment Standards. Indicate whether the SIU is subject to the following:
a. Local limits
®Yes ❑No
b. Categorical pretreatment standards ® Yes ❑ No
If subject to categorical pretreatment standards, which category and subcategory?
433.17

FACILITY NAME AND PERMIT NUMBER:
Triangle `v WTP. NC0026051
PERMIT ACTION REQUESTED:
Renewal
RIVER BASIN:
Cape Fear
SUPPLEMENTAL APPLICATION INFORMATION
PAR I' F.INDUSTRIAL USER DISCH_AR(;I:S AND It( RAI('I:RCLA WA i IS
All treatment works receiving discharges from significant industrial users or which receive RCRA,CERCLA, or other remedial wastes must
complete part F.
GENERAL INFORMATION:
F.1. Pretreatment program. Does the treatment works have, or is subject to an approved pretreatment program?
® Yes ❑ No
F.2. Number of Significant Industrial Users (SIUs) and Categorical Industrial Users (CIUs). Provide the number of each of the following types of
industrial users that discharge to the treatment works.
g. Number of non -categorical SIUs. 6
h. Number of CIUs. 9
SIGNIFICANT INDUSTRIAL USER INFORMATION:
Supply the following information for each SIU. If more than one SIU discharges to the treatment works, copy questions F.3 through F.8 and
provide the Information requested for each SIU.
F.3. Significant Industrial User Information. Provide the name and address of each SIU discharging to the treatment works. Submit additional pages
as necessary.
Name: Eisai
Mailing Address: PO Box 14505
Research Triangle Park, NC 27709
F.4. Industrial Processes. Describe all the industrial processes that affect or contribute to the SIU's discharge.
Pharniaceutical Manufacturing and R&D
F.5. Principal Product(s) and Raw Material(s). Describe all of the principal processes and raw materials that affect or contribute to the SIU's
discharge.
Principal product(s): Aciphex, Aricept
Raw material(s): Various reagents including acids. corn starch, ethanol, mineral oil, and sodium
chloride present
F.6. Flow Rate.
g•
Process wastewater flow rate. Indicate the average daily volume of process wastewater
discharge into the collection system in gallons per day (gpd) and whether the discharge is
continuous or intermittent.
36,132 gpd (X continuous or intermittent)
h. Non -process wastewater flow rate. Indicate the average daily volume of non -process
wastewater flow discharged into the collection system in gallons per day (gpd) and
whether the discharge is continuous or intermittent.
gpd ( continuous or intermittent)
F.7. Pretreatment Standards. Indicate whether the SIU is subject to the following:
a. Local limits ® Yes ❑ No
b. Categorical pretreatment standards ® Yes ❑ No
If subject to categorical pretreatment standards, which category and subcategory?
a1AnR,F

FACILITY NAME AND PERMIT NUMBER:
Triangle WWTP, NC0026051
PERMIT ACTION REQUESTED:
Renewal
RIVER BASIN:
Cape Fear
SUPPLEMENTAL APPLICATION INFORMATION
PART F.INDUSTRIAL USER DISCHARGES AND RCRA/CERCLA WASTES
All treatment works receiving discharges from significant industrial users or which receive RCRA,CERCLA, or other remedial wastes must
complete part F.
GENERAL INFORMATION:
F.1. Pretreatment program. Does the treatment works have, or is subject to an approved pretreatment program?
►1 Yes ❑ No
F.2. Number of Significant Industrial Users (SIUs) and Categorical Industrial Users (CIUs). Provide the number of each of the following types of
industrial users that discharge to the treatment works.
i. Number of non -categorical SIUs. 6
j. Number of CIUs. 9
SIGNIFICANT INDUSTRIAL USER INFORMATION:
Supply the following information for each SIU. If more than one SIU discharges to the treatment works, copy questions F.3 through F.8 and
provide the information requested for each SIU.
F.3. Significant Industrial User Information. Provide the name and address of each SIU discharging to the treatment works. Submit additional pages
as necessary.
Name: GlaxoSmithKline
Mailing Address: PO Box 13398
Research Triangle Park, NC 27709
F.4. Industrial Processes. Describe all the industrial processes that affect or contribute to the SIU's discharge.
Pharmaceutical R&D -pilot plant for clinical trials and developing manufacturing procedures.
F.5. Principal Product(s) and Raw Material(s). Describe all of the principal processes and raw materials that affect or contribute to the SIU's
discharge.
Principal product(s): Pharmaceutical R&D
Raw material(s): Numerous organic and inorganic chemicals that vary based on current project.
GSKs waste management policies attempt to ensure no unauthorized drain disposals.
F.6. Flow Rate.
i. Process wastewater flow rate. Indicate the average daily volume of process wastewater
discharge into the collection system in gallons per day (gpd) and whether the discharge is
continuous or intermittent.
306,048 gpd (X continuous or intermittent)
j.Non-process wastewater flow rate. Indicate the average daily volume of non -process wastewater
flow discharged into the collection system in gallons per day (gpd) and whether the
discharge is continuous or intermittent.
gpd ( continuous or intermittent)
F.7. Pretreatment Standards. Indicate whether the SIU
a. Local limits
b. Categorical pretreatment standards
If subject to categorical pretreatment
439 E
is subject
4
standards,
Yes
I
to the following:
❑ No
Yes ❑ No
which category and subcategory?

FACILITY NAME AND PERMIT NUMBER:
Triangle WWTP, NC002605 1
PERMIT ACTION REQUESTED:
Renewal
RIVER BASIN:
Cape Fear
SUPPLEMENTAL APPLICATION INFORMATION
PART F. INDUSTRIAL USER DISCHARGES AND RCRA/CERCLA WASTES
All treatment works receiving discharges from significant industrial users or which receive RCRA,CERCLA, or other remedial wastes must
complete part F.
GENERAL INFORMATION:
F.1. Pretreatment program. Does the treatment works have, or is subject to an approved pretreatment program?
® Yes ❑ No
F.2. Number of Significant Industrial Users (SIUs) and Categorical Industrial Users (CIUs). Provide the number of each of the following types of
industrial users that discharge to the treatment works.
k. Number of non -categorical SIUs. 6
1. Number of CIUs. 9
SIGNIFICANT INDUSTRIAL USER INFORMATION:
Supply the following information for each SIU. If more than one SIU discharges to the treatment works, copy questions F.3 through F.8 and
provide the information requested for each SIU.
F.3. Significant Industrial User information. Provide the name and address of each SIU discharging to the treatment works. Submit additional pages
as necessary.
Name: IBM
Mailing Address: PO Box 12195
Research Triangle Park, NC 27709
F.4. Industrial Processes. Describe all the industrial processes that affect or contribute to the SIU's discharge.
Light manufacturing/assembly of computer hardware products, refurbishment, and hardware and
software development. Call centers for software/hardware support and human resources.
F.5. Principal Product(s) and Raw Material(s). Describe all of the principal processes and raw materials that affect or contribute to the SIU's
discharge.
Principal product(s): Assembly and development of PCs and servers, computer R&D
Raw material(s): Some reagents, computers, servers, etc.
F.6. Flow Rate.
k. Process wastewater flow rate. Indicate the average daily volume of process wastewater
discharge into the collection system in gallons per day (gpd) and whether the discharge is
continuous or intermittent.
182.433 gpd (X continuous or intermittent)
1.Non-process wastewater flow rate. Indicate the average daily volume of non -process wastewater
flow discharged into the collection system in gallons per day (gpd) and whether the
discharge is continuous or intermittent.
gpd ( continuous or intermittent)
F.7. Pretreatment Standards. Indicate whether the SIU is subject to the following:
a. Local limits ® Yes ❑ No
b. Categorical pretreatment standards ❑ Yes ® No
If subject to categorical pretreatment standards, which category and subcategory?

FACILITY NAME AND PERMIT NUMBER:
Triangle WWTP, NC002605 1
PERMIT ACTION REQUESTED:
Renewal
RIVER BASIN:
Cape Fear
SUPPLEMENTAL APPLICATION INFORMATION
PART F. INDUSTRIAL USER DISCHARGES AND RCRA/CERCLA WASTES
All treatment works receiving discharges from significant industrial users or which receive RCRA,CERCLA, or other remedial wastes must
complete part F.
GENERAL INFORMATION:
F.1. Pretreatment program. Does the treatment works have, or is subject to an approved pretreatment program?
® Yes ❑ No
F.2. Number of Significant Industrial Users (SIUs) and Categorical Industrial Users (CIUs). Provide the number of each of the following types of
industrial users that discharge to the treatment works.
m. Number of non -categorical SIUs. 6
n. Number of CIUs. 9
SIGNIFICANT INDUSTRIAL USER INFORMATION:
Supply the following information for each SIU. If more than one SIU discharges to the treatment works, copy questions F.3 through F.8 and
provide the information requested for each SIU.
F.3. Significant Industrial User Information. Provide the name and address of each SIU discharging to the treatment works. Submit additional pages
as necessary.
Name: JMC
Mailing Address: PO Box 13582
Research Triangle Park, NC 27709
F.4. Industrial Processes. Describe all the industrial processes that affect or contribute to the SIU's discharge.
High purity chromium metal
F.5. Principal Product(s) and Raw Material(s). Describe all of the principal processes and raw materials that affect or contribute to the SIU's
discharge.
Principal product(s): High Purity Chromium
Raw material(s): Chromium Anhydride, Sulfuric, Water, Aluminum foil, Sodium Hydroxide, Nitric
F.6. Flow Rate.
M. Process wastewater flow rate. Indicate the average daily volume of process wastewater
discharge into the collection system in gallons per day (gpd) and whether the discharge is
continuous or intermittent.
790 gpd ( continuous or X intermittent)
n. Non -process wastewater flow rate. Indicate the average daily volume of non -process
wastewater flow discharged into the collection system in gallons per day (gpd) and
whether the discharge is continuous or intermittent.
gpd (
continuous or intermittent)
F.7. Pretreatment Standards. Indicate whether the SIU is subject to the following:
a. Local limits ® Yes ❑ No
b. Categorical pretreatment standards ® Yes ❑ No
If subject to categorical pretreatment standards, which category and subcategory?
413

FACILITY NAME AND PERMIT NUMBER:
Triangle WWTP, NC0026051
PERMIT ACTION REQUESTED:
Renewal
RIVER BASIN:
Cape Fear
SUPPLEMENTAL APPLICATION INFORMATION
PART FINDUSTRIAL USER DISCHARGES AND RCRA/CERCLA WASTES
All treatment works receiving discharges from significant industrial users or which receive RCRA,CERCLA, or other remedial wastes must
complete part F.
INFORMATION:GENERAL
F.1. Pretreatment program. Does the treatment works have, or is subject to an approved pretreatment program?
® Yes ❑ No
F.2. Number of Significant Industrial Users (SIUs) and Categorical Industrial Users (CIUs). Provide the number of each of the following types of
industrial users that discharge to the treatment works.
o. Number of non -categorical SIUs. 6
p. Number of CIUs. 9
SIGNIFICANT INDUSTRIAL USER INFORMATION:
Supply the following information for each SIU. If more than one SIU discharges to the treatment works, copy questions F.3 through F.8 and
provide the Information requested for each SIU.
F.3. Significant Industrial User Information. Provide the name and address of each SIU discharging to the treatment works. Submit additional pages
as necessary.
Name: NC IDEA (MCNC)
Mailing Address: PO Box 12889
Research Triangle Park, NC 27709
F.4. Industrial Processes. Describe all the industrial processes that affect or contribute to the SIU's discharge.
Semiconductor research and manufacturing
F.5. Principal Product(s) and Raw Material(s). Describe all of the principal processes and raw materials that affect or contribute to the SIU's
discharge.
Principal product(s): Silicon wafers and other components related to semiconductor processing
Raw material(s): Wafers and various chemicals including acids, bases, solvents, and gases.
F.6. Flow Rate.
o. Process wastewater flow rate. Indicate the average daily volume of process wastewater
discharge into the collection system in gallons per day (gpd) and whether the discharge is
continuous or intermittent.
P.
56,030 gpd (X continuous or intermittent)
Non -process wastewater flow rate. Indicate the average daily volume of non -process
wastewater flow discharged into the collection system in gallons per day (gpd) and
whether the discharge is continuous or intermittent.
gpd ( continuous or intermittent)
F.7. Pretreatment Standards. Indicate whether the SIU is subject to the following:
a. Local limits ® Yes ❑ No
b. Categorical pretreatment standards ® Yes n No
If subject to categorical pretreatment standards, which category and subcategory?
469.10

FACILITY NAME AND PERMIT NUMBER:
Triangle WWTP. NC0026051
PERMIT ACTION REQUESTED:
Renewal
SUPPLEMENTAL APPLICATION INFORMATION
RIVER BASIN:
Cape Fear
PART F. INDUSTRIAL USER DISCHARGES AND RCRAICERCLA WASTES
All treatment works receiving discharges from significant industrial users or which receive RCRA,CERCLA, or other remedial wastes must
complete part F.
GENERAL INFORMATION:
F.1. Pretreatment program. Does the treatment works have, or is subject to an approved pretreatment program?
® Yes El No
F.2. Number of Significant Industrial Users (SIUs) and Categorical Industrial Users (ClUs). Provide the number of each of the following types of
industrial users that discharge to the treatment works.
q. Number of non -categorical SIUs. 6
r. Number of CIUs. 9
SIGNIFICANT INDUSTRIAL USER INFORMATION:
Supply the following information for each SIU. If more than one SIU discharges to the treatment works, copy questions F.3 through F.8 and
provide the information requested for each SIU.
F.3. Significant Industrial User Information. Provide the name and address of each SIU discharging to the treatment works. Submit additional pages
as necessary.
Name: Research Triangle Institute (RTI)
Mailing Address: PO Box 12194
Research Triangle Park, NC 27709
F.4. Industrial Processes. Describe all the industrial processes that affect or contribute to the SIU's discharge.
Conducts basic and applied research for clients. Principal areas include various sciences,
engineering, statistics, and survey research. Possible small amounts of chemical samples.
F.5. Principal Product(s) and Raw Material(s). Describe all of the principal processes and raw materials that affect or contribute to the SIU's
discharge.
Principal product(s): Summary report of the results or methods developed.
Raw material(s):Reagent chemicals and solvents depending on research. Usually less than 100 grams.
F.6. Flow Rate.
q•
Process wastewater flow rate. Indicate the average daily volume of process wastewater
discharge into the collection system in gallons per day (gpd) and whether the discharge is
continuous or intennittent.
73.160
X continuous or intermittent)
r.Non-process wastewater flow rate. Indicate the average daily volume of non -process wastewater
flow discharged into the collection system in gallons per day (gpd) and whether the
discharge is continuous or intermittent.
gpd ( continuous or intermittent)
F.7. Pretreatment Standards. Indicate whether the SIU is subject to the following:
a. Local limits ® Yes ❑ No
b. Categorical pretreatment standards ❑ Yes ® No
If subject to categorical pretreatment standards, which category and subcategory?

FACILITY NAME AND PERMIT NUMBER:
Trian!le WWTP, NC002605 1
PERMIT ACTION REQUESTED:
Renewal
RIVER BASIN:
Cape Fear
SUPPLEMENTAL APPLICATION INFORMATION
PART F.INDUSTRIAL USER DISCHARGES AND RCRA/CERCLA WASTES
All treatment works receiving discharges from significant industrial users or which receive RCRA,CERCLA, or other remedial wastes must
complete part F.
GENERAL INFORMATION:
F.1. Pretreatment program. Does the treatment works have, or is subject to an approved pretreatment program?
® Yes ❑ No
F.2. Number of Significant Industrial Users (SIUs) and Categorical Industrial Users (CIUs). Provide the number of each of the following types of
industrial users that discharge to the treatment works.
s. Number of non -categorical SIUs. 6
t. Number of CIUs. 9
SIGNIFICANT INDUSTRIAL USER INFORMATION:
Supply the following information for each SIU. If more than one SIU discharges to the treatment works, copy questions F.3 through F.8 and
provide the information requested for each SIU.
F.3. Significant Industrial User Information. Provide the name and address of each SIU discharging to the treatment works. Submit additional pages
as necessary.
Name: SCM Metals
Mailing Address: PO Box 10166
Research Triangle Park, NC 27709
F.4. Industrial Processes. Describe all the industrial processes that affect or contribute to the SIU's discharge.
R&D and manufacturing of metal powders and brazing and solder pastes.
F.5. Principal Product(s) and Raw Material(s). Describe all of the principal processes and raw materials that affect or contribute to the SIU's
discharge.
Principal product(s): Powdered Copper, Tin Powder, Brazing Paste, and Solder Paste.
Raw material(s): Copper and Tin and accompanying additives
F.6. Flow Rate.
s. Process wastewater flow rate. Indicate the average daily volume of process wastewater
discharge into the collection system in gallons per day (gpd) and whether the discharge is
continuous or intermittent.
14,496 gpd (X continuous or
intermittent)
t.Non-process wastewater flow rate. Indicate the average daily volume of non -process wastewater
flow discharged into the collection system in gallons per day (gpd) and whether the
discharge is continuous or intermittent.
gpd
continuous or intermittent)
F.7. Pretreatment Standards. Indicate whether the SIU is subject to the following:
a. Local limits ® Yes D No
b. Categorical pretreatment standards ® Yes D No
If subject to categorical pretreatment standards, which category and subcategory?
471 .1

FACILITY NAME AND PERMIT NUMBER:
Ti ian lc WWTP, NC0026051
PERMIT ACTION REQUESTED:
Renewal
RIVER BASIN:
Cape Fear
SUPPLEMENTAL APPLICATION INFORMATION
PART F. INDUSTRIAL USER DISCHARGES AND RCRAICERCLA WASTES
All treatment works receiving discharges from significant industrial users or which receive RCRA,CERCLA, or other remedial wastes must
complete part F.
GENERAL INFORMATION:
F.1. Pretreatment program. Does the treatment works have, or is subject to an approved pretreatment program?
® Yes ❑ No
F.2. Number of Significant Industrial Users (SIUs) and Categorical Industrial Users (ClUs). Provide the number of each of the following types of
industrial users that discharge to the treatment works.
u. Number of non -categorical SIUs. 6
v. Number of CIUs. 9
SIGNIFICANT INDUSTRIAL USER INFORMATION:
Supply the following information for each SIU. If more than one SIU discharges to the treatment works, copy questions F.3 through F.8 and
provide the information requested for each SIU.
F.3. Significant Industrial User Information. Provide the name and address of each SIU discharging to the treatment works. Submit additional pages
as necessary.
Name: Sumitomo
Mailing Address: PO Box 13445
Research Triangle Park, NC 27709
F.4. Industrial Processes. Describe all the industrial processes that affect or contribute to the SIU's discharge.
Manufacture of fiber optic cable
F.5. Principal Product(s) and Raw Material(s). Describe all of the principal processes and raw materials that affect or contribute to the SIU's
discharge.
Principal product(s): Fiber Optic Cable
Raw material(s): Plastics, acrylics, PVC, mineral oil based jelly and steel jacket tape.
F.6. Flow Rate.
U.
Process wastewater flow rate. Indicate the average daily volume of process wastewater
discharge into the collection system in gallons per day (gpd) and whether the discharge is
continuous or intermittent.
13,825 gpd (X continuous or intermittent)
v. Non -process wastewater flow rate. Indicate the average daily volume of non -process
wastewater flow discharged into the collection system in gallons per day (gpd) and
whether the discharge is continuous or intermittent.
gpd (
continuous or intermittent)
F.7. Pretreatment Standards. Indicate whether the SIU is subject to the following:
a. Local limits
®Yes ❑No
b. Categorical pretreatment standards ❑ Yes ® No
If subject to categorical pretreatment standards, which category and subcategory?

FACILITY NAME AND PERMIT NUMBER:
Triangle WWTP, NC0026051
PERMIT ACTION REQUESTED:
Renewal
RIVER BASIN:
Cape Fear
SUPPLEMENTAL APPLICATION INFORMATION
PART F.INDUSTRIAL USER DISCHARGES AND RCRAiCERCLA WASTES
All treatment works receiving discharges from significant industrial users or which receive RCRA,CERCLA, or other remedial wastes must
complete part F.
GENERAL INFORMATION:
F.1. Pretreatment program. Does the treatment works have, or is subject to an approved pretreatment program?
® Yes ❑ No
F.2. Number of Significant Industrial Users (SIUs) and Categorical Industrial Users (CIUs). Provide the number of each of the following types of
industrial users that discharge to the treatment works.
w. Number of non -categorical SIUs. 6
x. Number of CIUs. 9
SIGNIFICANT INDUSTRIAL USER INFORMATION:
Supply the following information for each SIU. If more than one SIU discharges to the treatment works, copy questions F.3 through F.8 and
provide the information requested for each SIU.
F.3. Significant Industrial User Information. Provide the name and address of each SIU discharging to the treatment works. Submit additional pages
as necessary.
Name: Litespec
Mailing Address: PO Box 13445
Research Triangle Park, NC 27709
F.4. Industrial Processes. Describe all the industrial processes that affect or contribute to the SIU's discharge.
Permit owner certifies monthly that no process water is discharged.
F.5. Principal Product(s) and Raw Material(s). Describe all of the principal processes and raw materials that affect or contribute to the SIU's
discharge.
Principal product(s): When active, optical fiber
Raw material(s): Silica&germanium tetrachloride, H, N, Ar, HF, He, 0, chlorine. tetra fluorocarbon
F.6. Flow Rate.
w. Process wastewater flow rate. Indicate the average daily volume of process wastewater
discharge into the collection system in gallons per day (gpd) and whether the discharge is
continuous or intermittent.
0 gpd ( continuous or intermittent)
x. Non -process wastewater flow rate. Indicate the average daily volume of non -process
wastewater flow discharged into the collection system in gallons per day (gpd) and
whether the discharge is continuous or intermittent.
gpd ( continuous or intermittent)
F.7. Pretreatment Standards. Indicate whether the SIU is subject to the following:
a. Local limits
® Yes ❑ No
b. Categorical pretreatment standards ❑ Yes ® No
If subject to categorical pretreatment standards, which category and subcategory?

, FACILITY NAME AND PERMIT NUMBER:
Triangle WWTP, NC002605 1
PERMIT ACTION REQUESTED:
Renewal
RIVER BASIN:
Cape Fear
SUPPLEMENTAL APPLICATION INFORMATION
PART F. INDUSTRIAL USER DISCHARGES AND RCRA/CERCLA WASTES
All treatment works receiving discharges from significant industrial users or which receive RCRA,CERCLA, or other remedial wastes must
complete part F.
GENERAL INFORMATION:
F.1. Pretreatment program. Does the treatment
works have, or is subject to an approved pretreatment program?
❑ No
(SIUs) and Categorical Industrial Users (CIUs). Provide the number
works.
SIUs. 6
of each of the following types of
►1 Yes
F.2. Number of Significant Industrial Users
industrial users that discharge to the treatment
y. Number of non -categorical
z. Number of CIUs.
SIGNIFICANT INDUSTRIAL USER
9
INFORMATION:
discharges to the treatment works, copy questions F.3 through F.8 and
Supply the following information for each SIU. If more than one SIU
provide the information requested for each SIU.
F.3. Significant Industrial User Information. Provide the name and address of each SIU discharging to the treatment works. Submit additional pages
as necessary.
Name: Weck Closure Systems
Mailing Address: PO Box 12600
Research Triangle Park, NC 27709
F.4. Industrial Processes. Describe all the industrial processes that affect or contribute to the SIU's discharge.
Manufacture and repair hand held surgical instruments and disposable products.
F.5. Principal Product(s) and Raw Material(s). Describe all of the principal processes and raw materials that affect or contribute to the SIU's
discharge.
Principal product(s): Hand held surgical instruments and disposable products
Raw material(s): Stainless steel, titanium, tantalum, and form plastic parts.
F.6. Flow Rate.
Y. Process wastewater flow rate. Indicate
discharge into the collection system
continuous or intermittent.
28,026 gpd (X continuous
the average
in gallons per
or
Indicate the
collection system
or intermittent.
or
following:
❑ No
❑
which category
daily volume
day (gpd) and
intermittent)
of process wastewater
whether the discharge is
of non -process
per day (gpd) and
z. Non -process wastewater flow rate.
wastewater flow discharged into the
whether the discharge is continuous
gpd ( continuous
average daily volume
in gallons
intermittent)
F.7. Pretreatment Standards. Indicate whether
a. Local limits
b. Categorical pretreatment
If subject to categorical pretreatment
433
the SIU is subject to the
No
and subcategory?
►/ Yes
standards /1 Yes
standards,

FACILITY NAME AND PERMIT NUMBER:
Triangle WWTP, NC0026051
PERMIT ACTION REQUESTED:
Renewal
RIVER BASIN:
Cape Fear
SUPPLEMENTAL APPLICATION INFORMATION
PART F. INDUSTTRIAL USER DISCHARGES AND RCRA/CERGTES
All treatment works receiving discharges from significant industrial users or which receive RCRA,CERCLA, or other remedial wastes must
complete part F.
GENERAL INFORMATION:
F.1. Pretreatment
F.2. Number
industrial
aa.
I
of
users
Number
program. Does the treatment works have, or is subject to an approved pretreatment program?
Yes ❑ No
Significant Industrial Users (Sills) and Categorical Industrial Users (CIUs). Provide the number of each of the following types of
that discharge to the treatment works.
of non -categorical SIUs. 6
bb. Number of CIUs. 9
SIGNIFICANT INDUSTRIAL USER INFORMATION:
Supply the following information for each SIU. If more than one SIU discharges to the treatment works, copy questions F.3 through F.8 and
provide the information requested for each SIU.
F.3. Significant Industrial User information. Provide the name and address of each SIU discharging to the treatment works. Submit additional pages
as necessary.
Name: AstroPak
Mailing Address: 2410 Presidential Drive, Suite 114
Durham, NC 27703
F.4. Industrial Processes. Describe all the industrial processes that affect or contribute to the SIU's discharge.
Passivation and cleaning of stainless steel piping and equipment for the pharmaceutical industry
F.5. Principal Product(s) and Raw Material(s). Describe all of the principal processes and raw materials that affect or contribute to the SIU's
discharge.
Principal product(s): No products — cleaning and passivation of stainless steel equipment
Raw material(s): Various acids and bases used in cleaning — ie citric, ascorbic, and formic acids,
potassium hydroxide, hydrogen peroxide
F.6. Flow Rate.
aa. Process wastewater flow rate. Indicate the average daily volume of process wastewater
discharge into the collection system in gallons per day (gpd) and whether the discharge is
continuous or intermittent.
2100 per batch ( continuous or X intennittent)
bb. Non -process wastewater flow rate. Indicate the average daily volume of non -process
wastewater flow discharged into the collection system in gallons per day (gpd) and
whether the discharge is continuous or intermittent.
gpd ( continuous or intermittent)
F.7. Pretreatment Standards. Indicate whether the SIU
a. Local limits
b. Categorical pretreatment standards
If subject to categorical pretreatment
433.17
is subject
►1
standards,
Yes
►/
to the following:
❑ No
Yes ❑ No
which category and subcategory?

,FACILITY NAME AND PERMIT NUMBER:
Triangle WWTP, NC0026051
PERMIT ACTION REQUESTED:
Renewal
RIVER BASIN:
Cape Fear
SUPPLEMENTAL APPLICATION INFORMATION
PART F. INDUSTRIAL USER DISCHARGES AND RCRA/CERCLA WASTES
All treatment works receiving discharges from significant industrial users or which receive RCRA,CERCLA, or other remedial wastes must
complete part F.
GENERAL INFORMATION:
F.1. Pretreatment program. Does the treatment works have, or is subject to an approved pretreatment program?
Yes ❑ No
F.2. Number of Significant Industrial Users (Sills) and Categorical Industrial Users (CIUs). Provide the number of each of the following types of
industrial users that discharge to the treatment works.
cc. Number of non -categorical SIUs. 6
dd. Number of CIUs. 9
SIGNIFICANT INDUSTRIAL USER INFORMATION:
Supply the following information for each SIU. If more than one SIU discharges to the treatment works, copy questions F.3 through F.8 and
provide the information requested for each SIU.
F.3. Significant Industrial User Information. Provide the name and address of each SIU discharging to the treatment works. Submit additional pages
as necessary.
Name: Town of Cary
Mailing Address: 400 James Jackson Avenue
Cary, NC 27513
F.4. Industrial Processes. Describe all the industrial processes that affect or contribute to the SIU's discharge.
Town of Cary discharge that contains 2 pharmaceutical industries and domestic flow.
F.5. Principal Product(s) and Raw Material(s). Describe all of the principal processes and raw materials that affect or contribute to the SIU's
discharge.
Principal product(s): Domestic and pharmaceutical wastewater
Raw material(s): N/A
F.6. Flow Rate.
cc. Process wastewater flow rate. Indicate the average daily volume of process wastewater
discharge into the collection system in gallons per day (gpd) and whether the discharge is
continuous or intermittent.
375,462
gpd (X continuous or
intermittent)
dd. Non -process wastewater flow rate. Indicate the average daily volume of non -process
wastewater flow discharged into the collection system in gallons per day (gpd) and
whether the discharge is continuous or intermittent.
gpd ( continuous or intermittent)
F.7. Pretreatment Standards. Indicate whether the SIU is subject to the following:
a. Local limits ® Yes ❑ No
b. Categorical pretreatment standards ❑ Yes ® No
If subject to categorical pretreatment standards, which category and subcategory?

FACILITY NAME AND PERMIT NUMBER:
PERMIT ACTION REQUESTED:
RIVER BASIN:
SUPPLEMENTAL APPLICATION INFORMATION
PART G. COMBINED SEWER SYSTEMS
If the treatment works has a combined sewer system, complete Part G.
G.1. System Map. Provide a map indicating the following: (may be included with Basic Application Information)
a. All CSO discharge points.
b. Sensitive use areas potentially affected by CSOs (e.g., beaches, drinking water supplies, shellfish beds, sensitive aquatic ecosystems, and
outstanding natural resource waters).
c. Waters that support threatened and endangered species potentially affected by CSOs.
G.2. System Diagram. Provide a diagram, either in the map provided in G.1 or on a separate drawing, of the combined sewer collection system that
includes the following information.
a. Location of major sewer trunk lines, both combined and separate sanitary.
b. Locations of points where separate sanitary sewers feed into the combined sewer system.
c. Locations of in -line and off-line storage structures.
d. Locations of flow -regulating devices.
e. Locations of pump stations.
CSO OUTFALLS:
Complete questions G.3 through G.6 once for each CSO discharge point.
G.3. Description of Outfall.
a. Outfall number
b. Location
(City or town, if applicable) (Zip Code)
(County) (State)
(Latitude) (Longitude)
c. Distance from shore (if applicable) _ ft.
d. Depth below surface (if applicable) ft.
e. Which of the following were monitored during the last year for this
❑ Rainfall 0 CSO pollutant concentrations
0 CSO flow volume ❑ Receiving water quality
f. How many storm events were monitored during the last year?
G.4. CSO Events.
a. Give the number of CSO events in the last year.
CSO?
❑ CSO frequency
events (0 actual or ■ approx.)
b. Give the average duration per CSO event.
hours (■ actual or ❑ approx.)
EPA Form 3510-2A (Rev. 1-99). Replaces EPA forms 7550-6 & 7550-22.
Page 20 of 22

" FAOILITY NAME AND PERMIT NUMBER:
PERMIT ACTION REQUESTED:
RIVER BASIN:
G.5.
G.6.
c. Give the average volume per CSO event.
million gallons (0 actual or ❑ approx.)
d. Give the minimum rainfall that caused a CSO event in the last year
Inches of rainfall
Description of Receiving Waters.
a. Name of receiving water:
b. Name of watershed/river/stream system:
United State Soil Conservation Service 14-digit watershed code
c. Name of State Management/River Basin:
(if known):
United States Geological Survey 8-digit hydrologic cataloging unit
CSO Operations.
Describe any known water quality impacts on the receiving water caused
intermittent shell fish bed closings, fish kills, fish advisories, other recreational
code (if known):
by this CSO (e.g., permanent or intermittent beach closings, permanent or
loss, or violation of any applicable State water quality standard).
END OF PART G.
REFER TO THE APPLICATION OVERVIEW (PAGE 1) TO DETERMINE WHICH OTHER PARTS
OF FORM 2A YOU MUST COMPLETE.
EPA Form 3510-2A (Rev. 1-99). Replaces EPA forms 7550-6 & 7550-22.
Page 21 of 22

Process Flow Narrative Description
The Durham Triangle WWTP is a 12 MGD Advanced Secondary Treatment plant with
integral Biological Nutrient Removal that discharges to Northeast Creek. In order to
produce the high -quality final product, the raw influent is subjected to a sequence of
individual unit processes ranging from fine screening to disinfection. Each unit process
has its own side streams and discharge by-products that must be processed or disposed of.
The treatment scheme applied at the Triangle WWTP includes Andritz Aqua Screen
continuous belt -type fine screens discharging to the influent pump station, which is
equipped with Fairbanks Morse Pumps. The Fairbanks Morse pumps lift the screened
influent to the upper treatment level where the Jeta vortex grit removal and flow
measurement units are located. After the two physical processes of screening and grit
removal, the influent is directed to the five -stage biological treatment process.
Each Kruger (a Veolia Water Systems Company) Modified A2/O treatment train includes
a three (3) cell anaerobic selector for phosphorous removal, a two (2) cell primary anoxic
zone for nitrogen removal, an oxidation ditch for aerobic BOD removal and nitrification
of ammonia, a two (2) cell secondary anoxic zone for additional denitrification, and re -
aeration prior to the four (4) 110-ft diameter Enviroquip secondary clarifiers.
The Return Activated Sludge (RAS) is directed to the first cell of the anaerobic selector
to provide the RAS with additional denitrification time in an effort to create truly
anaerobic conditions prior to the introduction of the raw influent containing readily -
degradable soluble BOD. The screened and de -gritted influent is directed to the second
cell of the anaerobic selector, where it is commingled with Return Activated Sludge
(RAS) from the Enviroquip secondary clarifiers.

The forward flow continues on through the third cell of the anaerobic selector and
proceeds to the first cell of the primary anoxic zone. Nitrified mixed liquor recycled
from the aerobic oxidation ditch is discharged to the first cell of the primary anoxic zone,
as well. The primary anoxic zone provides the anoxic ambient conditions and carbon
source required to denitrify the nitrates recycled from the oxidation ditch.
The discharge from the oxidation ditches is directed to the secondary anoxic zone for
further denitrification. Methanol can be added to this unit to provide the carbon source
required to drive the denitrification reactions if the effluent nitrogen concentration is too
high. In addition, a "RAS Bleedoff" is incorporated that enables the Mixed Liquor
Suspended Solids (MLSS) concentration in the second anoxic stage to be increased. The
denitrified wastewater is re -aerated prior to discharging to the clarifiers, where the heavy
MLSS are separated from the clarified effluent and are returned to the head of the
process, as described above. The clarified effluent that discharges over the weirs is
directed to the tertiary Filters.
The Ondeo Degremont rapid sand filters polish the fines from the treated water. The
filtered effluent is then disinfected through the Trojan Ultraviolet Disinfection unit and
directed to the post aeration basin prior to stream discharge.

DURHAM COUNTY TRIANGLE
WASTEWATER TREATMENT FACILITY
INTERIM BIOSOLIDS MANAGEMENT
DURHAM COUNTY, NORTH CAROLINA
Original Submittal: June 2002
Lead Review Agency:
Mr. Dave Goodrich
NC-DENR Water Quality Section, Point Source Branch, NPDES Unit
1617 Mail Service Center
Raleigh, N.C. 27699-1617
[phone] ext.517
Municipal Contact:
Mr. Chuck Hill, P.E.
Durham County Engineering Dept.
120 Parrish St. Law Building
Durham, N.C. 27701
[phone]
Engineering Consultant:
Mr. Kevin C. Eberle, P.E.
McKim & Creed, P.A.
5625 Dillard Drive, Suite 117
Cary, N.C. 27511
[phone]
Prepared by:
McKim & Creed, P.A.
5625 Dillard Drive, Suite 117
Cary, NC 27511
[phone]
4?/' McKINI&CREED

INTRODUCTION
A detailed Engineering Alternative Analysis and Basis for Final Design Report was completed
for the Durham County Triangle Wastewater Treatment Facility in July 2000. Based on
recommendations from that Study and the subsequent Environmental Assessment, Durham
County has elected to upgrade the Triangle Wastewater Treatment Facility Upgrade to a
state-of-the-art, 12.0 MGD, five stage biological nutrient removal system (BNR) with chemical
phosphorus precipitation, tertiary sand filtration and UV disinfection. The proposed
improvements will allow Durham County to reduce total nitrogen mass discharges to
Northeast Creek by 69% from currently permitted levels and to reduce phosphorus mass
discharges by 50% from currently permitted levels.
In order to insure that the Triangle WWTF continues to produce an effluent in full compliance with
existing and future NPDES permit limits, construction of the proposed improvements must be
completed in Phases. This will allow existing treatment processes to remain in full operation until
completion of the five -stage BNR process. The proposed improvements will be constructed in
three phases via three separate construction contracts. Key treatment process
components included in each phase are as follows:
Phase I: Influent pumping station, screening, grit removal, influent flow
measurement, UV disinfection, post aeration, effluent flow
measurement, and SCADA systems.
Phase II: Five stage biological nutrient removal process, tertiary filtration, waste
activated and recycled activated sludge pumping systems, chemical
feed systems, Laboratory, Administrative Offices and Maintenance
Building Construction, and SCADA integration.
Phase III: Waste activated sludge storage, sludge thickening, thickened sludge
storage, belt filter press dewatering, Class A lime pasteurization
process, truck loading, and emergency Class A residuals storage.
2
0/McKINI&CREED

• J.
The schedule for construction is as follows:
Phase I Construction Starts
Phase I Construction Substantially Complete
Phase II Start-up, Stabilization and Operational Testing
NPDES Permit Issuance (Phase II)
Authorization to Construct (Phase II)
Phase II Advertisement for Bids
Phase II Open Bids
Phase II Award Contracts
Phase II Start Construction
Phase II Substantial Completion Phase II Construction
Phase II Final Completion
Phase II Start-up, Stabilization and Operational Testing
Phase II NPDES Compliance Date
Phase III Advertisement for Bids
Phase III Open Bids
Phase III Award Contracts
Phase III Start Construction
Phase III Substantial Completion Phase III Construction
Phase III Final Completion
Phase III Start-up, Stabilization and Operational Testing
March 2002
November 2002
November 1 - December 31, 2002
May 1, 2002
May 1, 2002
July, 2002
August 20, 2002
September 16, 2002
November 4, 2002
August 31, 2004
October 31, 2004
November 1 - December 31, 2004
January 1, 2005
September, 2004
October 20, 2004
December 16, 2004
January 15, 2005
January 15, 2006
March 15, 2006
March 15, 2006-June 1, 2006
The Phase III improvements (Biosolids Management Processes) cannot be initiated until after
the new five -stage BNR process is completed. This is because the new biosolids
improvements will be constructed in the footprint of the existing aeration basins and,
therefore, cannot be taken off-line until after BNR startup. As such, this Interim Biosolids
Management Plan has been developed to insure the Triangle WWTF will continue to
adequately store, treat and dispose of all residuals produced while the facility is under the
various phases of construction.
BACKGROUND
The Triangle Wastewater Treatment Facility (WWTF) is located at the intersection of NC 55
and Alexander Drive in the southeast corner of Durham County, North Carolina. The
municipal wastewater treatment facility is owned by Durham County and is currently
operated under contract with Woodard & Curran Inc.
Treated effluent from the facility is discharged to Northeast Creek, a tributary to Jordan Lake
in the Cape Fear Drainage Basin. The existing surface water discharge is permitted under
MCKLM&CREED

the National Pollution Discharge Elimination System (NPDES) subject to effluent conditions
described in Permit # NC0026051 which became effective on April 1, 1996.
The Wastewater Treatment Facility (WWTF) was originally constructed in the earlyl 960's to
abate surface water pollution. The original facility consisted of a two -celled facultative
lagoon designed to reduce organic and suspended solids loading to Northeast Creek.
Since that time, three significant Wastewater Treatment Facility upgrades have been
completed including:
•: 1973 Upgrade to construct a new activated sludge secondary treatment
system with design capacity of 3 MGD.
• 1986 Upgrade to expand existing activated sludge process to 6 MGD and
to construct two new tertiary sand filters to enhance BOD and TSS
removals.
• 1990's Upgrade to incorporate chemical phosphorus removal using alum.
The County converted the original, facultative lagoons into facultative sludge
stabilization/storage basins as part of the 1973 and 1990 upgrades. The use of these 8 MG
(16 MG total capacity) facultative, sludge storage lagoons has continued since that time.
In 1993 the County completed a biosolids treatment and disposal plan and received State
Certification for periodic Class B land application onto 452 acres of agricultural lands in
Granville County. The County entered into two, 1-year contracts with EWR, Inc. and
BioGrow, Inc. for biosolids removal and disposal in 1993 and 1994. In 1995, AMSCO, Inc.,
now known as Synagro Southeast, Inc., was retained by the County under a 3-year contract
to remove and land -apply accumulated biosolids.
In March 1998, Woodard and Curran, Inc. (W&C) was retained as the Contract Operator for
the Triangle WWTF and has been responsible for biosolids handling and disposal since that
time. W&C's current contract with the County expires in 2003.
4
MCMM&CREED

According to Annual Operating Reports submitted to the County by W&C, the 1999 average
daily flow to the Triangle WWTF was 4.141 MGD. Waste activated sludge (WAS) production
during this same period was 1,112 dry tons. Then in 2000, biosolids production dropped to
753 dry tons and futher dropped to 722 DT in 2001. W&C attributes the significant
difference in WAS production in the second and third year to supplemental residuals
management by the biotechnology firm Ennix Bio-Service. According to W&C, the cultured
biomass additive has been successful in reducing soluble BOD5 concentrations in the lagoon
supernatant, which is regularly returned to the treatment process. This reduction in BOD5
loading to the main treatment process has significantly decreased biosolids production and,
as a result, reduced the volume of biosolids wasted to the lagoons.
During the three year period from 1999-2001, Woodard & Curran has documented biosolids
production to be 2,587 dry tons. During this same period, they have either physically
removed, or documented volatile solids reduction in the lagoons amounting to a total of
4,649 dry tons.
Under W&C's management, biosolids are typically removed from the lagoons and land -
spread only once per year during a 30 - 60 day period coinciding with the farmer's hay
cropping schedule. In the past, W&C has retained the services of specialty firms to vacuum
dredge the lagoons and either land apply liquid biosolids or dewater the biosolids on -site
and dispose of dewatered cake on certified land -application sites located in Granville
County. Liquid biosolids removed from the lagoons typically have an average solids
content of 6 to 8 percent solids and have been as high as 14 percent solids.
A Facility Evaluation and Preliminary Engineering Study completed in 1997 identified a
number of recommended improvements and the need to expand the hydraulic and
organic capacity of the Triangle WWTF. The Evaluation also identified the need to replace
the existing biosolids facultative lagoons with more modern biosolids handling facilities to
insure the County can consistently satisfy biosolids disposal regulatory requirements.
In June 1999, the County retained McKim & Creed to assist them in completing the required
Engineering Alternative Analysis and Basis of Design Report prior to proceeding with
5 fr?/* McKIM&CREED

mandatory facility improvements and expanding the hydraulic and organic capacity of the
Triangle WWTF to accommodate projected sewage flows through the year 2023.
Based on the final recommendations from the Engineering Alternative Analysis and Basis of
Design Report, the County has proceeded with permitting and design of a new, state-of-the-
art, 5-stage biological nutrient removal process at the existing Triangle WWTF site. In order to
expedite the environmental review and permitting process, the Engineering Alternative
Analysis concentrated on the main process train and did not evaluate biosolids
management alternatives in connection with the new facility.
Amendment #1 to the original Engineering Alternative Analysis has been completed in draft
form and specifically addresses permanent Biosolids Management at the upgraded Triangle
WWTF. It also provides recommendations and a basis for final design for the proposed new
biosolids storage, thickening, dewatering and stabilization processes.
This Interim Biosolids Management Plan is intended to provide overall guidance for
managing residuals produced during the four-year phased construction period prior to the
start-up of the new Biosolids Management Improvements.
BIOSOLIDS PRODUCTION ESTIMATES
Estimates of biosolids production have been made on an annual basis for the period
between May 2002 and December 2006. This period fully includes all phases of
construction. Biosolids production estimates were developed using current Average
Daily Flow and actual biosolids production information provided by the Contract
Operator Woodard and Curran. Future year wastewater flows were previously
projected as reported in the Engineering Alternative Analysis and Basis for Design Report
dated July 2000, last updated October 2000. Assuming organic and suspended solids
concentrations remain consistent, biosolids production will be proportional to influent
flow to the plant. As such, residuals production on a dry weight basis are expected to
increase as summarized in Table 1.
/?fr McKIM&CREED

•
•
TABLE 1
PROJECTED BIOSOLIDS PRODUCTION BETWEEN MAY 2002 AND DECEMBER 2006
TRIANGLE WASTEWATER TREATMENT FACILITY
YEAR
AVERAGE DAILY INFLUENT
SEWAGE FLOW
(MGD)
PROJECTED BIOSOLIDS
PRODUCTION
(TONS/YEAR DRY WEIGHT)
2002
5.0
810
2003
5.7
924
2004
6.3
1020
2005
6.87
1 1 12
2006
7.45
1206
INTERIM BIOSOLIDS MANAGEMENT INFRASTRUCTURE
The interim period during construction of the proposed wastewater system improvements
will be one of near continuous change. As such, the facilities available for biosolids
storage and stabilization are summarized in Table 2 by Phase and year.
TABLE 2
PROJECTED BIOSOLIDS PRODUCTION BETWEEN MAY 2002 AND DECEMBER 2006
TRIANGLE WASTEWATER TREATMENT FACILITY
PHASE
YEAR
DESCRIPTION OF BIOSOLIDS INFRASTRUCTURE
BIOSOLIDS STORAGE
CAPACITY
(TONS — DRY WT) 1)
I/II
2002
Facultative Sludge Storage Lagoon Cells #1 and #2
4,010
1/11
2003
Facultative Sludge Storage Lagoon Cell #2
2,046
II
2004
Facultative Sludge Storage Lagoon Cell #2
2,046
11/111
2005
Facultative Sludge Storage Lagoon Cell #2
2,046
III
2006
Facultative Sludge Storage Lagoon Cell #2
2,046
I) Refer to Attachment # 1 for computations of Safe Sludge Storage Volume of each facultative sludge storage
lagoon cell.
As indicated in Table 2, biosolids production is projected to increase, yet biosolids
storage capacity will be temporarily reduced by 50% of current capacity during
construction. Construction of the new five -stage Biological Nutrient Removal process will
necessarily require permanent conversion of existing facultative lagoon cell # 1 (western
lagoon). Thus, the County will be forced to operate with only one of the two 8 MG
facultative sludge storage/stabilization lagoons during the interim four-year construction
period.
0/McKINI&CREED

INTERIM BIOSOLIDS MANAGEMENT PLAN
Year 2002
In 2002, Durham County is arranging to retain a contract-dewatering firm to completely
remove, dewater and dispose of all existing biosolids in both facultative sludge storage
lagoons. The County has programmed sufficient funds to allow them to dispose of up to
3,500 dry tons of Class B residuals from the two lagoons in 2002.
The stored biosolids have already been tested to confirm that the material meets Class B
requirements for pathogen reduction (i.e. fecal coliform concentration <2,000,000 MPN per
one gram sample) and vector attraction (i.e. volatile solids reduction of >38%). It is
estimated that there are a total of 1872 dry tons of sludge in inventory (390 dry tons in
Lagoon Cell # 1 and an additional 1482 dry tons in Lagoon Cell #2). Between now and the
date that contract dewatering is scheduled for completion, an additional 270 dry tons of
waste biosolids will be generated and discharged to Lagoon Cell #2. Current estimates
indicate that there will be an estimated total of 2,145 dry tons to be removed in 2002. This is
well within the County's established budget.
Per the latest NCDENR Non -Discharge Permit (#WQ 0007989), the 5-year adjusted land
application rate for Durham residuals (on agricultural land via surface application) is 7.66 Dry
Tons/acre. Durham will therefore need 280 acres of land for disposal of the entire 2,145 Dry
Tons as calculated below:
2,145 DT/7.66 DT/ac = 280 acres
Durham County currently has a total of 452.8 acres of permitted agricultural land
available for disposal of biosolids. Therefore, the County does not anticipate the need to
locate supplemental disposal sites. However, the County is prepared to use
supplemental disposal sites as necessary.
Years 2003 - 2004
Biosolids produced in years 2003 - 2004 in the existing extended aeration process and in
years 2005-2006 in the new five -stage BNR process will be discharged to Lagoon Cell #2
8
MCKIIM & CREED

•
•
(eastern lagoon). The Contract Operators will continue to gravity thicken and decant
liquid on a semi -continuous basis to thicken residuals to an average solids concentration
of 7.0%. The County is committed to continue their annual sludge removal and land
application program during this interim period to prevent accumulation of biosolids in
the lagoon.
The projected biosolids production and the associated annual removal requirements
during these years are summarized in Table 3.
TABLE 3
PROJECTED BIOSOLIDS PRODUCTION & ANNUAL DISPOSAL REQUIREMENTS
BETWEEN MAY 2002 AND DECEMBER 2006
TRIANGLE WASTEWATER TREATMENT FACILITY
YEAR
PROJECTED BIOSOLIDS
PRODUCTION
(TONS/YEAR DRY WEIGHT)
ANTICIPATED BIOSOLIDS DISPOSAL
VIA LAND APPLICATION (1)
(TONS/YEAR DRY WEIGHT)
2002
810
810
2003
924
924
2004
1020
1020
2005
1112
1112
2006
1206
1206
Per Table 2, Durham County will maintain biosolids stabilization/storage capacity for up
to 2,046 DT of biosolids at an average solids concentration of 7%. This is equivalent to 2.5
years storage capacity (based on 2002 production volumes) or 1.7 years storage
capacity (at anticipated 2006 biosolids production volumes). Therefore, even though
the County plans to remove biosolids annually at the same rate of production, they have
the ability to store biosolids on -site for up to 20- 24 months if necessary.
In 2006, the County will have the option of either contract dewatering Lagoon Cell #2, as
planned for prior years, or pumping the residuals into the new Class A biosolids
stabilization process. In either case, the County will have adequate resources to
accommodate storage and disposal of residuals for the entire interim period.
*/McIQM&CREED