NC0026051_Renewal Application_20150910

�• n
• Engineering and
-UUEnvironmental Services
, Utility Division —Triangle WWTP
September 1, 2015
NCDENR/DWQ RECEIVEDIDENRIDWR
Attn: NPDES Unit SEP 10 201
1617 Mail Service Center
Raleigh, North Carolina 27699-1617 Water Quality
Permitting Section
Re: NPDES Permit Renewal Application
NCO026051
Triangle Wastewater Treatment Plant
Durham County
Dear NPDES Unit Staff:
Durham County requests renewal of the NPDES permit for the Triangle Wastewater Treatment,Plant,
NC0026051. The current permit requires a renewal request 180 days prior to expiration. As the'current
permit'expires on April 30, 2016,the renewal request is due by November 2, 2015. This submission
meets°that requirement.
During the current permit period, Durham County has continued to produce an "Exceptional Quality" °
effluent and.met our Jordan Lake nutrient load requirements. The effect of nutrient reduction at the,
Triangle Wastewater' Treatment Plant has been documented °by the U'S Geological Survey �in their
Scientific Investigations Report 2013-5007, "Relation of Watershed Setting and Stream Nutrient Yield
at Selected Sites in Central and Eastern North Carolina; 1997-2008". We plan to continue producing° °
"Exceptional Quality"nutrient reduced effluent during our next permit cycle.
With respect to the future permit, we request the following,modifications:
1. Deleting the instream monitoring requirement. We primarily wish to delete these monitoring
locations for safety reasons. To obtain representative data, these streams must be sampled from
bridges on Sedwick Road and Grandale Road. Both bf these roads are heavily traveled'and only
two lanes wide.
Additionally, the data is practically valueless. This,facility discharges to a creek designated as a
zero 7Q10 stream, and the instream data gathered for this permit is not used to determine
wastewater treatment plant effluent`limits. As the wastewater treatment plant°discharge is the
predominant discharge to the stream, the effluent quality of the Triangle Wastewater Treatment
Plant is indicative of stream quality.
5926 NC Highway 55 East,Durham,North Carolina 27713
[phone] i Fax[phone] l dconc.gov
Equal Employment/Affirmative Action Employer

i L
Flowdata at the downstream monitoring point, Attachment 1, shows the impact of the diurnal
variation in wastewater treatment flows to this creek and substantiates that this is an effluent
dominated creek. As the instream data is of de minimus value and obtaining the data is '
exceptionally dangerous, we request that the Director waive the instream monitoring requirement
in accordance with 15A NCAC 02B .0508 (b)(1) as the objectives of instream sampling can be
achieved by other means. The means is to consider the wastewater treatment plant effluent to be
indicative of stream quality at our discharge point.
2. Nutrient Load Limit Increase. Durham County has recently allowed the connection of a direct
discharge sand filter system for a single family residence to our collection system with treatment
at the Triangle Wastewater Treatment Plant. The site is:
a. Nancy C. Mallett Trust, 4423 Hopson Road, Morrisville, NC 27560, with an existing 3
bedroom sandfilter system which discharged into a storm sewer at a neighboring
apartment complex.
i. There were numerous complaints about the discharge from this system and Mack
Wiggins with the Raleigh Regional Office can provide details about the system
problems.
ii. This site is approximately 10,000 feet from the Triangle Wastewater Treatment
Plant.
iii. The stormwater pipe discharge is to a tributary upstream of the Triangle
Wastewater Treatment Plant effluent discharge point.
iv. Based on the April 2, 2015 "Remedy Discharging Sand Filters" guidance with a
2.2 person occupancy for a three bedroom house and a 7.4 #/cap/year TN and a
1.8 #/cap/year TP credit rate, we request a 16.28 pound per year total nitrogen and
a 3.96 pound per year total phosphorus load limit increase.
Additionally, Durham County has allowed the connection of two commercial septic systems to
our collection system at the Triangle Wastewater Treatment Plant, the sites are:
b. Durham Wildlife Club, 3616 Hopson Road, Morrisville, NC 27560 with an 1860 gallon
per day existing septic system.
i. The site is approximately 5,000 feet from the Triangle Wastewater Treatment
Plant.
ii. Runoff from this site is to a tributary of Northeast Creek downstream of the
Triangle Wastewater Treatment Plant effluent discharge point.
iii. Based on my best professional judgement on the failure rates of septic systems in
Triassic Basin Soils, I would recommend a credit equal to at least 25 percent of
the credit for a discharging sand filter. This discharge flowrate is equivalent to a
31 person capita rating. At 7.4 #/cap/year TN and 1.8 #/cap/year, we request a
57.35 pound per year total nitrogen and a 13.95 pound per year total phosphorus
load limit increase.
c. Stone Center of Carolina, 6515 NC Highway 55 East, Durham, NC 27713, with a 400
gallon per day existing septic system.
i. The site is approximately 3,400 feet from the Triangle Wastewater Treatment
Plant.

'"Now-
ii. Runoff from this site is to a tributary of Northeast Creek downstream of the
Triangle Wastewater Treatment Plant effluent discharge point.
iii. Based on my best professional judgement on the failure rates of septic systems in
Triassic Basin Soils, I would recommend a credit equal to at least 25 percent of
the credit for a discharging sand filter. This discharge flowrate is equivalent to a
6 person capita rating. At 7.4 #/cap/year TN and 1.8 #/cap/year, we request an
11.1 pound per year total nitrogen and a 2.7 pound per year total phosphorus,load
limit increase.
A table summarizing our load request is below:
Current Mallett Durham Stone Total
Nutrient Limit Trust Wildlife Center Request
(#/year) (#/year) (#/year) (#/year) (#/year) Increase
Nitrogen 111,207 7.4 57.35 11.1 111,282 0.067%
Phosphorus 8432 3.96 13.95 2.7 8453 0.24%e
Durham County recognizes these are relatively small increases in our allowable nutrient load;
however, Durham County is interested in validating the nutrient credit program to justify larger,
future investment in the connection of discharging sand filters and septic systems to our
collection system.
Durham County staff, and especially Stephanie Brixey, have expended a significant amount of time and
effort to provide a complete and accurate permit application. If additional information or clarification-is
needed,please feel free to contact in&at(919) 560-9035. As our draft permit is prepared, we would like
to meet with the permit writer prior to fact sheet preparation or draft permit issuance.
Sincerely,
/If
VPearce,
oPE
Utility Division Manager/POTW Director
Enclosures
cc: Jay Gibson, E&ES Director
Stephanie Brixey, Utility Division Compliance Manager
JRP/cs
5926 NC Highway 55 East,Durham, North Carolina 27713
[phone] 1 Fax[phone] dconc gov
Equal Employment/Affirmative Action Employer

FACILITY NAME AND PERMIT NUMBER: PERMIT ACTION REQUESTED: RIVER BASIN:
Triangle Wastewater Treatment Plant, NCO026051 Renewal Cape Fear
'e,
FORM ter:
2A WRY APPLICATWIO0V ERVIENV
4
NPDES
APPLICATION OVERVIEW
Form 2A has been developed in a modular format and consists of a "Basic Application in formation" packet
and a "Supplemental Application Information" packet. The Basic Application Information packet is divided
into two parts. All applicants must complete Parts A and C.- Applicants
pli6ants with a design flow greater than or
equal to 0.1 mgd must also complete Part B. Some applicants must also complete the Supplemental
Application Information packet. The following items explain which parts of Form 2A you must complete.
BASIC APPLICATION INFORMATION:
A. Basic Application Information for all Applicants. All applicants must complete questions A.1 through A.8. A treatment works
that discharges effluent to surface waters of the United States must also answer questions A.9 through A.12.
B. Additional Application Information for Applicants with a Design Flow z 0.1 mgd. All treatment works that have design flows
greater than or equal to 0.1 million gallons per day must complete questions 13.1 through 13.6.
C. Certification. All applicants must complete Part C(Certification).
SUPPLEMENTAL APPLICATION INFORMATION:
D. Expanded Effluent Testing Data. A treatment works that discharges effluent to surface waters of the United States and meets
one or more of the following criteria must complete Part D(Expanded Effluent Testing Data):
1. Has a design flow rate greater than or equal to 1 mgd,
2. Is required to have a pretreatment program(or has one in place),or
3. Is otherwise required by the permitting authority to provide the information.
E. Toxicity Testing Data. A treatment works that meets one or more of the following criteria must complete Part E(Toxicity Testing
Data):
1 Has a design flow rate greater than or equal to I mgd,
2. Is required to have a pretreatment program(or has one in place),or
3. Is otherwise required by the permitting authority to submit results of toxicity testing.
F. Industrial User Discharges and RCRA/CERCLA Wastes. A treatment works that accepts process wastewater from any
significant industrial users(SlUs)or receives RCRA or CERCLA wastes must complete Part F(industrial User Discharges
and RCRAICERCLA Wastes). SlUs are defined as:
1. All industrial users subject to Categorical Pretreatment Standards under 40 Code of Federal Regulations(CFR)403.6 and
40 CFR Chapter 1, Subchapter N(see instructions);and
2. Any other industrial user that:
a. Discharges an average of 25,000 gallons per day or more of process wastewater to the treatment works(with certain
exclusions);or
b. Contributes a process wastestrearn that makes up 5 percent or more of the average dry weather hydraulic or organic
capacity of the treatment plant;or
C. Is designated as an SIU by the control authority.
G. Combined Sewer Systems. A treatment works that has a combined sewer system must complete Part G(Combined Sewer
Systems).
ALLAPPLI
A CANT MIjST'C0MPLETE-PART C (CERTIFICATION)-
EPA Form 3510-2A(Rev.1-99). Replaces EPA forms 7550-6&7550-22. Page 1 of 22

FACILITY NAME AND PERMIT NUMBER: PERMIT ACTION REQUESTED: RIVER BASIN:
Triangle Wastewater Treatment Plant, NCO026051 Renewal Cape Fear
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113AMCAPPI
LIGATIONAN FORMATIOW-
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FP9,M,�T ALL�APF TS-'�O'!
PART=A'-'-BASIC)-APP,�-kc�k-T.19!4,�,IN
ION'FOR,
All treatment works must complete questions A.1 through A.8 of this Basic Application Information Packet.
A.I. Facility Information.
Facility Name Triangle Wastewater Treatment Plant
Mailing Address 5926 NC Hwy 55 East
Durham,NC 27713
Contact Person Joe Pearce
Title Utility Division Mana_qer POTW Director
Telephone Number [phone]
Facility Address 5926 NC Hwy 55 East
(not P.O.Box) Durham,NC 27713
A.2. Applicant Information. If the applicant is different from the above,provide the following:
Applicant Name
Mailing Address
Contact Person
Title
Telephone Number
Is the applicant the owner or operator(or both)of the treatment works?
0 owner 0 operator
Indicate whether correspondence regarding this permit should be directed to the facility or the applicant.
El facility Z applicant
A.3. Existing Environmental Permits. Provide the permit number of any existing environmental permits that have been issued to the treatment works
(include state-issued permits).
NPDES NCO026051 PSD
UIC Other WQCS00038,WQ003282 1,W000 11396
RCRA Other NCd1 10054
A.4. Collection System Information. Provide information on municipalities and areas served by the facility. Provide the name and population of each
entity and,if known,provide information on the type of collection system(combined vs.separate)and its ownership(municipal,private,etc.).
Name Population Served Type of Collection System Ownership
Durham County 3,722 Separate Durham County
City of Durham 7,117 Separate City of Durham
Total population served 10,839
EPA Form 3510-2A(Rev.1-99) Replaces EPA forms 7550-6&7550-22. Page 2 of 22

FACILITY NAME AND PERMIT NUMBER: PERMIT ACTION REQUESTED: RIVER BASIN:
Triangle Wastewater Treatment Plant, NC0026051 Renewal Cape Fear
A.5. Indian Country.
a. Is the treatment works located in Indian Country?
❑ Yes ® No
b. Does the treatment works discharge to a receiving water that is either in Indian Country or that is upstream from(and eventually flows
through)Indian Country?
❑ Yes ® No
A.6. Flow. Indicate the design flow rate of the treatment plant(i.e.,the wastewater flow rate that the plant was built to handle). Also provide the
average daily flow rate and maximum daily flow rate for each of the last three years. Each year's data must be based on a 12-month time period
with the 12th month of"this year"occurring no more than three months prior to this application submittal.
a Design flow rate 12 mgd
Two Years Ago Last Year This Year
b. Annual average daily flow rate 6.27 6.83 5.81
C. Maximum daily flow rate 13.43 14.08 12.11
A.7. Collection System. Indicate the type(s)of collection system(s)used by the treatment plant. Check all that apply. Also estimate the percent
contribution(by miles)of each.
® Separate sanitary sewer 100 %
❑ Combined storm and sanitary sewer %
A.8. Discharges and Other Disposal Methods.
a. Does the treatment works discharge effluent to waters of the U.S.? ® Yes ❑ No
If yes,list how many of each of the following types of discharge points the treatment works uses:
i. Discharges of treated effluent 1 (one)
ii. Discharges of untreated or partially treated effluent
iii. Combined sewer overflow points
iv. Constructed emergency overflows(prior to the headworks)
V. Other
b. Does the treatment works discharge effluent to basins,ponds,or other surface impoundments
that do not have outlets for discharge to waters of the U.S.? ❑ Yes ® No
If yes,provide the following for each surface impoundment
Location.
Annual average daily volume discharge to surface impoundment(s) mgd
Is discharge ❑ continuous or ❑ intermittent?
C. Does the treatment works land-apply treated wastewater? ❑ Yes ® No
If yes,provide the following for each land application site:
Location:
Number of acres
Annual average daily volume applied to site: mgd
Is land application ❑ continuous or I ❑ intermittent?
d. Does the treatment works discharge or transport treated or untreated wastewater to another
treatment worksl' ❑ Yes ® No
EPA Form 3510-2A(Rev.1-99). Replaces EPA forms 7550-6&7550-22. Page 3 of 22

FACILITY NAME AND PERMIT NUMBER: PERMIT ACTION REQUESTED: RIVER BASIN:
Triangle Wastewater Treatment Plant, NCO026051 Renewal Cape Fear
If yes,describe the mean(s)by which the wastewater from the treatment works is discharged or transported to the other treatment works
(e.g.,tank truck,pipe).
If transport is by a party other than the applicant,provide:
Transporter Name
Mailing Address
Contact Person
Title
Telephone Number ( )
For each treatment works that receives this discharge,provide the following:
Name
Mailing Address
Contact Person
Title
Telephone Number ( )
If known,provide the NPDES permit number of the treatment works that receives this discharge
Provide the average daily flow rate from the treatment works into the receiving facility. mgd
e. Does the treatment works discharge or dispose of its wastewater in a manner not included
in A 8.through A.8.d above(e.g.,underground percolation,well injection): ❑ Yes ® No
If yes,'provide the following for each disposal method:
Description of method(including location and size of site(s)if applicable):
Annual daily volume disposed by this method:
Is disposal through this method ❑ continuous or ❑ intermittent?
EPA Form 3510-2A(Rev.1-99). Replaces EPA forms 7550-6&7550-22 Page 4 of 22

FACILITY NAME AND PERMIT NUMBER: PERMIT ACTION REQUESTED: RIVER BASIN:
Triangle Wastewater Treatment Plant, NCO026051 Renewal Cape Fear
WASTEWATER DISCHARGES:
If you answered"Yes"to question A.8.a,complete questions A.9 through A.12 once for each outfall(including bypass points)through
which effluent is discharged. Do not include information on combined sewer overflows in this section. If you answered"No"to question
A.8.a,go to Part B,"Additional Application Information for Applicants with a Design Flow Greater than or Equal to 0.1 mgd."
A.9. Description of Outfall.
a. Outfall number 001
b Location Durham,NC 27713
(City or town,if applicable), (Zip Code)
Durham NC
(County) (State)
35 52'51" 78 53'50"
(Latitude) (Longitude)
C. Distance from shore(if applicable) NA ft.
d. Depth below surface(if applicable) NA ft.
e. Average daily flow rate 5.1 mgd
f. Does this outfall have either an intermittent or a periodic discharge? ❑ Yes ® No (go to A.9.g)
If yes,provide the following information:
Number f times per year discharge occurs:
Average duration of each discharge.
Average flow per discharge: mgd
Months in which discharge occurs:
g. Is outfall equipped with a diffuser? ❑ Yes ® No
A.10. Description of Receiving Waters.
a. Name of receiving water Northeast Creek
b. Name of watershed(if known) Cape Fear
United States Soil Conservation Service 14-digit watershed code(if known):
C. Name of State Management/River Basin(if known):Basin:03-06-05
United States Geological Survey 8-digit hydrologic cataloging unit code(if known):
d. Critical low flow of receiving stream(if applicable)
acute NA ds chronic 0 cfs
e. Total hardness of receiving stream at critical low flow(if applicable) mg/I of CaCO3
EPA Form 3510-2A(Rev 1-99) Replaces EPA forms 7550-6&7550-22. Page 5 of 22

4 1
FACILITY NAME AND PERMIT NUMBER: PERMIT ACTION REQUESTED: RIVER BASIN:
Triangle Wastewater Treatment Plant, NCO026051 Renewal Cape Fear
A.11. Description of Treatment
a. What level of treatment are provided? Check all that apply.
❑ Primary ❑ Secondary
® Advanced ® Other. Describe: TertiarV,Enhanced biological nutrient removal
b. Indicate the following removal rates(as applicable):
Design BOD5 removal or Design CBOD5 removal 975 %
Design SS removal 972 %
Design P removal 94.4 %
Design N removal 93.1 %
Other Design Ammonia 96 %
C. What type of disinfection is used for the effluent from this outfall? If disinfection varies by season,please describe.
Ultraviolet Disinfection(UV)
If disinfection is by chlorination is dechlorination used for this outfall? ❑ Yes ❑ No
Does the treatment plant have post aeration? ® Yes ❑ No
A.12. Effluent Testing Information. All Applicants that discharge to waters of the US must provide effluent testing data for the following
parameters.,Provide the indicated effluent testing required by the permitting authority for each outfall through which effluent is
discharged. Do not include information on combined sewer overflows In this section. All information reported must be based on data
collected through analysis conducted using 40 CFR Part 136 methods. In addition,this data must comply with QA/QC requirements of
40 CFR Part 136 and other appropriate QA/QC requirements for standard methods for analytes not addressed by 40 CFR Part 136. At a
minimum,effluent testing data must be based on at least three samples and must be no more than four and one-half years apart.
Outfall number: 001
'MAXIMUM DAILY yALUEJ AVERAGE•DAILY VALUE
`,PARAMETER --- - -
: ;Value w"- .; ,f•,Unifs':;% ti,=}z•.Value, :.�:- Units• Number of,Samples
R-
s.u.
pH(Minimum) 6.7
pH(Maximum) 7.8 s.u.
Flow Rate 14.08 mgd 6.3 m d 1096
Temperature(Winter) 22.5 °C 16.3 °C 299
Temperature(Summer) 28.7 °C 23.4 °C 450
•For pH please report a minimum and a maximum daily value
MAXIMUM.DAILY r• E:.;_ -�
' ,°•� = AVERAGE;DAILY. SCHARGE
'DISCHARGE ANALYTICAL
"POLUITANTn - ': - ;; :MUMDL
`r t;: n. ='°'ter ::4�METHOD'` .i: .;+ „-
Number of% , �<.• k
e'x' r N Conc.ti' nits,', ±Cork:> Units'. :; >s•.,-•% ''
Samples
CONVENTIONAL AND NON CONVENTIONAL COMPOUNDS
BIOCHEMICAL OXYGEN BOD5 7,8 m /l <2.0 Mg/1 408 SM 52108 2.0
DEMAND(Report one) CBOD5
FECAL COLIFORM 95 #/100 ml 4 #/100 ml 409 SM 9222D 1 C01/100 ml
TOTAL SUSPENDED SOLIDS(TSS) 4.7 m /I <2.5 mg/1 408 SM 2540D 2.5
END.'OF'PART A:•-
REFER�TO THE ,PPLICATION`OVERVIEW: PAGE l M.DMIRMINE WHICH=OTHER,,PARTS= n;~
- ._ � _ �-• - . =l .�,
:OF-FORM'2A YOU'MUST;COMPLETE
EPA Form 3510-2A(Rev.1-99) Replaces EPA forms 7550-6&7550-22. Page 6 of 22

FACILITY NAME AND PERMIT NUMBER: PERMIT ACTION REQUESTED: RIVER BASIN:
Triangle Wast6water Treatment Plant, NCO026051 Renewal Cape Fear
-,BASIC-APPLICAT- IONIINFORMAT,110W
PART B. �ADQITIONAL APPLICATION INFORMATION.. , - 06k-�0066wf6 WITH A-DESIGW*L6*OkLArik'Thk
N`61"
---EAL'. 0.1 AGD(1100,000§a ons-perday):
All applicants with a design flow rate 0.1 mgd must answer questions B.1 through B.6. All others go to Part C(Certification).
B.I. Inflow and Infiltration. Estimate the average number of gallons per day that flow into the treatment works from inflow and/or infiltration.
300,000 gpd
Briefly explain any steps underway or planned to minimize inflow and infiltration.
We complete quarterly priority line inspections to identify areas to repair. Manhole and collection system inspection
program and coating/replacement as necessary.
B.2. Topographic Map. Attach to this application a topographic map of the area extending at least one mile beyond facility property boundaries This
map must show the outline of the facility and the following information. (You may submit more than one map if one map does not show the entire
area.)
a. The area surrounding the treatment plant,including all unit processes.
b. The major pipes or other structures through which wastewater enters the treatment works and the pipes or other structures through which
treated wastewater is discharged from the treatment plant. Include outfalls from bypass piping,if applicable.
c Each well where wastewater from the treatment plant is injected underground.
d. Wells,springs,other surface water bodies,and drinking water wells that are: 1)within 1/4 mile of the property boundaries of the treatment
works,and 2)listed in public record or otherwise known to the applicant.
e. Any areas where the sewage sludge produced by the treatment works is stored,treated,or disposed.
f. If the treatment works receives waste that is classified as hazardous under the Resource Conservation and Recovery Act(RCRA)by truck,rail,
or special pipe,show on the map where the hazardous waste enters the treatment works and where it is treated,stored,and/or disposed.
B.3. Process Flow Diagram or Schematic. Provide a diagram showing the processes of the treatment plant,including all bypass piping and all
backup power sources or redunancy in the system. Also provide a water balance showing all treatment units,including disinfection(e.g.,
chlorination and dechlonnation). The water balance must show daily average flow rates at influent and discharge points and approximate daily flow
rates between treatment units. Include a brief narrative description of the diagram.
B.4. Operation/Maintenance Performed by Contractor(s).
Are any operational or maintenance aspects(related to wastewater treatment and effluent quality)of the treatment works the responsibility of a
contractor? El Yes 0 No
If yes,list the name,address,telephone number,and status of each contractor and describe the contractors responsibilities(attach additional-
pages if necessary)
Name:
Mailing Address:
Telephone Number:
Responsibilities of Contractor:
B.5. Scheduled improvements and Schedules of Implementation. Provide information on any uncompleted implementation schedule or
uncompleted plans for improvements that will affect the wastewater treatment,effluent quality,or design capacity of the treatment works. If the
treatment works has several different implementation schedules or is planning several improvements,submit separate responses to question B.5
for each. (If none,go to question B.6.)
a. List the outfall number(assigned in question A.9)for each outfall that is covered by this implementation schedule.
None
b. Indicate whether the planned improvements or implementation schedule are required by local,State,or Federal agencies
El Yes El No
EPA Form 3510-2A(Rev 1-99). Replaces EPA forms 7550-6&7550-22. Page 7 of 22

FACILITY NAME AND PERMIT NUMBER: PERMIT ACTION REQUESTED: RIVER BASIN:
Triangle Wastewater Treatment Plant, NCO026051 Renewal Cape Fear
C. If the answer to B.5.b is"Yes,"briefly describe,including new maximum daily inflow rate(if applicable).
d. Provide dates imposed by any compliance schedule or any actual dates of completion for the implementation steps listed below,as
applicable. For improvements planned independently of local,State,or Federal agencies,indicate planned or actual completion dates,as
applicable. Indicate dates as accurately as possible.
Schedule Actual Completion
Implementation Stage MM/DD/YYYY MM/DD/YYYY
Begin Construction
End Construction
Begin Discharge
Attain Operational Level / / / /
e. Have appropriate permits/clearances concerning other Federal/State requirements been obtained? ❑ Yes ❑ No
Describe briefly:
B.6. EFFLUENT TESTING DATA(GREATER THAN 0.1 MGD ONLY).
Applicants that discharge to waters of the US must provide effluent testing data for the following parameters. Provide the Indicated
effluent testing required by the permitting authority for each outfall through which effluent is discharged. Do not include information
on combine sewer overflows in this section. All information reported must be based on data collected through analysis conducted
using 40 CFR Part 136 methods. In addition,this data must comply with QA/QC requirements of 40 CFR Part 136 and other appropriate
QA/QC requirements for standard methods for analytes not addressed by 40 CFR Part 136. At a minimum effluent testing data must be
based on at least three pollutant scans and must be no more than four and on-half years old.
Outfall Number: 001
MAXIMUM, y:�
DAJL`Y ,„
a., V,ERi4GE'DAILY'DISCHARGE;,°
A
POLLUTANT ': ' _-__ _ -ANALYTICAL ML/MlD
= - `,_. 'METHOD`, ,.,,
Numb'e�.of . ..
COr1C
nits, t,: Conc.' UnitS _ z N r _ 'i
ti
'. :E ,-y Samples'= ;"� _
CONVENTIONAL AND NON CONVENTIONAL COMPOUNDS
AMMONIA(as N) 4.2 mg/I 0.1 mg/I 417 SM 4500NH3 D 0.10
CHLORINE(TOTAL 10 ug/I 9 ug/I 3 SM 4500CI G 2.0
RESIDUAL,TRC)
DISSOLVED OXYGEN 10.9 mg/I 8.8 mg/I 749 Hach 10360 0.05
TOTAL KJELDAHL 2.5 mg/l 0.88 mg/I 158 EPA 351.1 0.20
NITROGEN(TKN)
NITRATE PLUS NITRITE 8.74 mg/I 2.86 mg/I 158 EPA 353.2 0.10
NITROGEN
OIL and GREASE <5 mg/I <5 mg/I 3 EPA 1664A 5.0
PHOSPHORUS(Total) 2.89 mg/I 0.248 mg/1 157 EPA 200.8 0.02
TOTAL DISSOLVED SOLIDS 428 mg/I 378 mg/I 3 SM 2540C 10.0
(TDS)
OTHER Chloride 94.8 mg/I 73.5 mg/l 12 SM 4500Ci C 0.10
Fluoride 1.2 mg/I 0.7 mg/I 157 SM 450OF C t_-0.10
"ENO-OF PART'B : -
`OVERVIE ( AG ''1)TDTERMINEWHICOPARTSTHPLICATIOREFER'TO`. W •
OF FO2A YOU;M_ UST COMPLETE-
RK
EPA Form 3510-2A(Rev.1-99). Replaces EPA forms 7550-6&7550-22. Page 8 of 22

FACILITY NAME AND PERMIT NUMBER: PERMIT ACTION REQUESTED: RIVER BASIN:
Triangle Wastewater Treatment Plant, NCO026051 Renewal Cape Fear
:BASIC"A"i ld A-TIONINFORmAnON.,,,:,
PART C CERTIFICATION
'
All applicants must complete the Certification Section. Refer to instructions to determine who is an officer for the purposes of this
certification. All applicants must complete all applicable sections of Form 2A,as explained in the Application Overview. Indicate below which
parts of Form 2A you have completed and are submitting. By signing this certification statement,applicants confirm that they have reviewed
Form 2A and have completed all sections that apply to the facility for which this application is submitted.
Indicate which parts of Form 2A you have completed and are submitting:
Basic Application Information packet Supplemental Application Information packet:
Z Part D(Expanded Effluent Testing Data)
Part E(Toxicity Testing Biomonitoring Data)
Part F(Industrial User Discharges and RCRA/CERCLA Wastes)
❑ Part G(Combined Sewer Systems)
-'AL:"L�-'API?L[C'A"NTS�,'MU!§T',COMPLETE; fRLL0%NF6Id,CEkj10ICXTIbN
I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system
designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who
manage the system or those persons directly responsible for gathering the information,the information is,to the best of my knowledge and belief,true,
accurate,and complete I am aware that there are significant penalties for submitting false information,including the possibility of fine and imprisonment
for knowing violations.
Name and official title WAe(DnsC untv Manager
Signature P'
Telephone number (919))60-0000
Date signed
Upon request of the permitting authority,you must submit any other information necessary to assure wastewater treatment practices at the treatment
works or identify appropriate permitting requirements.
SEND COMPLETED FORMS TO:
NCDENR/ DWQ
Attn: NPDES Unit
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
EPA Form 3510-2A(Rev 1-99). Replaces EPA forms 7550-6&7550-22. Page 9 of 22

FACILITY NAME AND PERMIT NUMBER: PERMIT ACTION REQUESTED: RIVER BASIN:
Triangle Wastewater Treatment Plant, NCO026051 Renewal Cape Fear
Outfall number: 001 (Complete once for each outfall discharging effluent to waters of the United States.)
MAXIMUM:DAILY DISCHARGE . 'AVERAGE'DAILY:DISCHARGE r'-
POLLUTANTNumtie�' "ANALYTICAL'"
y - <y< _.';, :r:`�. METHOD ;ML/MD'L
Units.' Mass 'Units Conn. -Units = Mass' Units of,=•
VOLATILE ORGANIC COMPOUNDS
ACROLEIN <50 ugh <2 72 lbs <50 ug/I <2.30 lbs. 3 EPA 624 50.0
ACRYLONITRILE <10 ug/I <0.54 lbs <10 ug/I <0 46 lbs 3 EPA 624 10.0
BENZENE <1 ug/I <0 05 lbs. <1 ug/I <0 05 lbs 3 EPA 624 10
BROMOFORM <1 ug/I <0.05 lbs <1 ug/I <0.05 lbs. 3 EPA 624 1.0
CARBON <1 ug/I <0.05 lbs. <1 ug/I <0 05 lbs. 3 EPA 624 1.0
TETRACHLORIDE
CHLOROBENZENE <1 ug/I <0 05 lbs. <1 ug/I <0.05 lbs. 3 EPA 624 1.0
CHLORODIBROMO- <1 ug/I <0.05 lbs <1 ug/I <0.05 lbs. 3 EPA 624 1.0
METHANE
CHLOROETHANE <5 ug/I <0 27 lbs. <5 ug/I <0.23 lbs. 3 EPA 624 5.0
2-CHLOROETHYLVINYL <5 ug/I <0 27 lbs <5 ug/I <0.23 lbs 3 EPA 624 5.0
ETHER
CHLOROFORM <1 ug/I <0 05 lbs. <1 ug/I <0.05 lbs. 3 EPA 624 1.0
DICHLOROBROMO- <1 ug/I <0 05 lbs <1 ug/I <0.05 lbs. 3 EPA 624 10
METHANE
1,1-DICHLOROETHANE <1 ug/I <0.05 lbs <1 ug/I <0.05 lbs. 3 EPA 624 1.0
1,2-DICHLOROETHANE <1 ug/I <0 05 lbs. <1 ug/I <0.05 lbs. 3 EPA 624 1.0
TRANS-I,2-DICHLORO- <1 ug/I <0 05 lbs <1 ug/I <0.05 lbs 3 EPA 624 1.0
ETHYLENE
1,1-DICHLORO- <1 ug/I <0.05 lbs. <1 ug/I <0.05 lbs. 3 EPA 624 1.0
ETHYLENE
1,2-DICHLOROPROPANE <1 ug/I <0.05 lbs <1 ug/I <0.05 lbs 3 EPA 624 10
1,3-DICHLORO- <1 ug/I <0.05 lbs <1 ug/I <0.05 lbs. 3 EPA 624 10
PROPYLENE
ETHYLBENZENE <1 ug/I <0 05 lbs. <1 ug/I <0 05 lbs 3 EPA 624 1.0
METHYL BROMIDE <5 ug/I <0.27 lbs <5 ug/I <0.23 lbs. 3 EPA 624 5.0
METHYL CHLORIDE <5 ug/I <0.27 lbs <5 ug/I <0 23 lbs. 3 EPA 624 5.0
METHYLENE CHLORIDE <1 ug/I <0.05 lbs <1 ug/I <0 05 lbs. 3 EPA 624 1.0
1,1,2,2-TETRA- <1 ug/I <0 05 lbs. <1 ug/I <0.05' lbs 3 EPA 624 1.0
CHLOROETHANE
TETRACHLORO- <1 ug/I <0 05 lbs. <1 ug/I <0 05 lbs. 3 EPA 624 1.0
ETHYLENE
TOLUENE <1 ug/I <0 05 lbs <1 ug/I I <0 05 lbs. 3 EPA 624 1.0
EPA Form 3510-2A(Rev 1-99). Replaces EPA forms 7550-6&7550-22 Page 11 of 22

FACILITY NAME AND PERMIT NUMBER: PERMIT ACTION REQUESTED: RIVER BASIN:
Triangle Wastewater Treatment Plant, NCO026051 Renewal Cape Fear
Outfall number: 001 (Complete once for each outfall discharging effluent to waters of the United States.)
'' MAXIMUMDAILYr'DISCHARGE=« '' ;. c,:- .` �"
kA
Y'
POLLUTANT' ° - Number ;`i4NALYTICAL MUMDL
"' ,Gpnc:; Unitsi :Mass°- Units'- Conc.' Units', -Mass• Units=� •�';of' METHOD.
n`.. _
Sample's
<1 ug/I <0.05 lbs. <1 ug/I <0.05 lbs. 3 EPA 624 1.0
TRICHLOROETHANE
<1 ug/I <0.05 lbs. <1 ug/1 <0 05 lbs 3 EPA 624 1.0
TRICHLOROETHANE
TRICHLOROETHYLENE <1 ug/I <0.05 lbs <1 ug/I <0 05 lbs. 3 EPA 624 1.0
VINYL CHLORIDE <5 ug/I <0 27 lbs <5 ug/I <0 23 lbs 3 EPA 624 50
Use this space(or a separate sheet)to provide information on other volatile organic compounds requested by the permit writer
1,4-Dichlorobenzene <1 ug/I <0 05 lbs. <1 ug/I <0.05 lbs 3 EPA 624 1.0
1,2-Dichlorobenzene <1 ug/I <0.05 lbs. <1 ugh <0.05 lbs 3 EPA 624 1.0
1,3-Dichlorobenzene <1 ug/I <0 05 lbs. <1 ug/I <0.05 lbs. 3 EPA 624 10
1,2-Dibromoethane <1 ug/I <0 05 lbs. <1 ug/I <0.05 lbs. 3 EPA 624 1.0
Trichlorofluoromethane <5 ug/I <0 27 lbs <5 ug/I <0.23 lbs 3 EPA 624 5.0
Cis-1,3- <1 ug/I <0.05 lbs. <1 ug/I <0 05 lbs. 3 EPA 624 1 0
dichloropropylene
ACID-EXTRACTABLE COMPOUNDS
P-CHLORO-M-CRESOL <10 ug/I <0.54 lbs. <10 ug/I <0.46 lbs. 3 EPA 625 10
2-CHLOROPHENOL <10 ug/I <0 54 lbs <10 ug/I <0 46 lbs 3 EPA 625 10
2,4-DICHLOROPHENOL <10 ug/I <0.54 lbs. <10 ug/I <0.46 lbs. 3 EPA 625 10
2,4-DIMETHYLPHENOL <10 ug/I <0.54 lbs <10 ug/I <0.46 lbs. 3 EPA 625 10
4,6-DINITRO-0-CRESOL <50 ug/I <2 72 lbs <50 ug/I <2 30 lbs. 3 EPA 625 50
2,4-DINITROPHENOL <50 ug/I <2.72 lbs <50 ug/I <2.30 lbs. 3 EPA 625 50
2-NITROPHENOL <10 ug/I <0.54 lbs. <10 ug/I <0.46 lbs. 3 EPA 625 10
4-NITROPHENOL <50 ug/I <2.72 lbs <50 ug/I <2.30 lbs. 3 EPA 625 50
PENTACHLOROPHENOL <50 ug/I <2 72 lbs. <50 ug/I <2.30 lbs. 3 EPA 625 50
PHENOL <10 ug/I <0.54 lbs <10 ug/I <0 46 lbs 3 EPA 625 10
2,4,6- <10 ug/I <0 54 lbs. <10 ug/I <0 46 lbs 3 EPA 625 10
TRICHLOROPHENOL
Use this space(or a separate sheet)to provide information on other acid-extractable compounds requested by the permit writer
BASE-NEUTRAL COMPOUNDS
ACENAPHTHENE <10 ug/I <054 lbs. <10 ug/I <0.46 lbs. 3 EPA 625 10
ACENAPHTHYLENE <10 ug/I <0.54 lbs <10 ug/I <0.46 lbs 3 EPA 625 10
EPA Form 3510-2A(Rev 1-99). Replaces EPA forms 7550-6&7550-22. Page 12 of 22

FACILITY NAME AND PERMIT NUMBER: PERMIT ACTION REQUESTED: RIVER BASIN:
Triangle Wastewater Treatment Plant, NCO026051 Renewal Cape Fear
Outfall number: 001 (Complete once for each outfall discharging effluent to waters of the United States.)
" ;MAXIMUM,DAILY.DISCHARGE.= i4VERAGE DAILY DISCHARGE'.
POLLUTANT,° Number_ ANALYTICAL• ML/MDL
'Cone. Units �Mas's. !Uniti,.. "Coni -Units, .Mass -Units- of'._,; 'METHOD-
§aru"ples"
ANTHRACENE <10 ug/1 <0.54 lbs <10 ug/1 <0.46 lbs. 3 EPA 625 10
BENZIDINE <50 ug/1 <2 72 lbs <50 ug/l <2.30 lbs. 3 EPA 625 50
BENZO(A)ANTHRACENE <10 ug/l <0.54 lbs <10 ug/I <0.46 lbs 3 EPA 625 10
BENZO(A)PYRENE <10 ug/1 <0 54 lbs <10 ug/I <0.46 lbs 3 EPA 625 10
3,4 BENZO- <10 ug/I <0 54 lbs <10 ug/I <0 46 lbs 3 EPA 625 10
FLUORANTHENE
BENZO(GHI)PERYLENE <10 ug/I <0.54 lbs. <10 ug/l <0 46 lbs 3 EPA 625 10
BENZO(K) <10 ug/I <0 54 lbs <10 ug/l <0.46 lbs 3 EPA 625 10
FLUORANTHENE
BIS(2-CHLOROETHOXY) <10 ug/I <0 54 lbs. <10 ug/I <0.46 lbs 3 EPA 625 10
METHANE
BIS(2-CHLOROETHYL} <10 ug/I <0.54 lbs. <10 ugh <0.46 lbs. 3 EPA 625 10
ETHER
BIS(2-CHLOROISO- <10 ug/I <0 54 lbs <10 ug/1 <0.46 lbs. 3 EPA 625 10
PROPYL)ETHER
BIS(2-ETHYLHEXYL) 289 ug/l 15.7 lbs. 99.7 ug/I 4.58 lbs. 3 EPA 625 10
PHTHALATE
4-BROMOPHENYL <10 ug/I <0 54 lbs <10 ug/I <0.46 lbs 3 EPA 625 10
PHENYLETHER
BUTYL BENZYL <10 ug/l <0.54 lbs <10 ug/I <0.46 lbs. 3 EPA 625 10
PHTHALATE
2-CHLORO- <10 ug/1 <0.54 lbs <10 ug/l <0.46 lbs. 3 EPA 625 10
NAPHTHALENE
4-CHLORPHENYL <10 ugh <0.54 lbs. <10 ug/I <0.46 lbs 3 EPA 625 10
PHENYLETHER
CHRYSENE <10 ug/I <0.54 lbs <10 ug/I <0.46 lbs 3 EPA 625 10
DI-N-BUTYL PHTHALATE <10 ug/1 <0 54 lbs <10 ug/I <0.46 lbs 3 EPA 625 10
DI-N-OCTYL PHTHALATE <10 ug/1 <0 54 lbs. <10 ug/l <0 46 lbs. 3 EPA 625 10
DIBENZO(A,H) <10 ug/1 <0 54 lbs. <10 ug/I <0 46 lbs. 3 EPA 625 10
ANTHRACENE
1,2-DICHLOROBENZENE <10 ug/I <0.54 lbs <10 ug/I <0.46, lbs. 3 EPA 625 10
1,3-DICHLOROBENZENE <10 ug/I <054 lbs <10 ug/1 <0.46 lbs 3 EPA 625 10
1,4-DICHLOROBENZENE <10 ug/l <0.54 lbs. <10 ug/I <0.46 lbs. 3- EPA 625 10
3,3-DICHLORO- <50 ug/I <2.72 lbs. <50 ug/I <2 30 lbs. 3 EPA 625 50
BENZIDINE
DIETHYL PHTHALATE <10 ug/1 <0.54 lbs. <10 ug/I <0.46 lbs. 3 EPA 625 10
DIMETHYL PHTHALATE <10 ug/I <0.54 lbs <10 ug/l <0 46 lbs. 3 EPA 625 10
EPA Form 3510-2A(Rev.1-99). Replaces EPA forms 7550-6&7550-22. Page 13 of 22

FACILITY NAME AND PERMIT NUMBER: PERMIT ACTION REQUESTED: RIVER BASIN:
Triangle Wastewater Treatment Plant, NCO026051 Renewal Cape Fear
Outfall number. 001 (Complete once for each outfall discharging effluent to waters of the United States.)
MAXIMUM DAILY DISCHARGE~ -.AVERAGE,DAILY,DISCHARGE
-i'. .'g• ter;- •'r. 2^ v .p:• - .Y�r! ,. .•r-;�iG - �~--
<r A�•,, _ %ANAL'YTICAL'. .
POLLUTANT•,.' .r` `Number,- ML%MDL
u Cone:' }Units 'Mass }Units Cone. Units`•: Mass Units of,.; METHOD _
a
2,4-DINITROTOLUENE <10 ug/I <0 54 lbs. <10 ug/I <0 46 lbs 3 EPA 625 10
2,6-DINITROTOLUENE <10 ug/I <0.54 lbs <10 ug/I <0.46 lbs. 3 EPA 625 10
1,2-DIPHENYL-
HYDRAZINE <10 ug/I <0.54 lbs <10 ug/I <0.46 lbs 3 EPA 625 10
FLUORANTHENE <10 ug/I <0.54 lbs. <10 ug/I <0 46 lbs 3 EPA 625 10
FLUORENE <10 ug/I <0.54 lbs <10 ug/I <0.46 lbs 3 EPA 625 10
HEXACHLOROBENZENE <10 ug/I <0.54 lbs. <10 ug/I <0 46 lbs 3 EPA 625 10
HEXACHLORO- <10 ug/I <0.54 lbs <10 ug/I <0.46 lbs 3 EPA 625 10
BUTADIENE
HEXACHLOROCYCLO- <50 ug/I <2.72 lbs <50 ug/I <2 30 lbs. 3 EPA 625 50
PENTADIENE
HEXACHLOROETHANE <10 ug/I <0 54 lbs. <10 ug/I <0 46 lbs. 3 EPA 625 10
INDENO(1,2,3-CD) <10 ug/I <0.54 lbs <10 ug/I <0.46 lbs 3 EPA 625 10
PYRENE
ISOPHORONE <10 ug/I <0.54 lbs <10 ug/I <0 46 lbs. 3 EPA 625 10
NAPHTHALENE <10 ug/I <0 54 lbs <10 ug/I <0.46 lbs. 3 EPA 625 10
NITROBENZENE <10 ug/I <054 lbs <10 ug/I <0.46 lbs. 3 EPA 625 10
N-NITROSODI-N- <10 ug/I <0.54 lbs <10 ug/I <0.46 lbs 3 EPA 625 10
PROPYLAMINE
N-NITROSODI- <10 ug/I <0.54 lbs. <10 ug/I <0 46 lbs. 3 EPA 625 10
METHYLAMINE
N-NITROSODI- <10 ug/I <0 54 lbs. <10 ug/I <0.46 lbs 3 EPA 625 10
PHENYLAMINE
PHENANTHRENE <10 ug/I <054 lbs. <10 ug/I <0.46 lbs 3 EPA 625 10
PYRENE <10 ug/I <0 54 lbs <10 ug/I <0.46 lbs 3 EPA 625 10
1'2'4 <10 ug/I <0.54 lbs. <10 ug/I <0.46 lbs. 3 EPA 625 10
TRICHLOROBENZENE
2,4-Dinitrophenol <50 ug/I <2.72 lbs. <50 ug/I <2 30 lbs 3 EPA 625 50
2-Methylnaphthalene <10 ug/I <0.54 lbs. <10 ug/I <0 46 lbs. 3 EPA 625 10
Use this space(or a separate sheet)to provide information on other base-neutral compounds requested by the permit writer
Use this space(or a separate sheet)to provide information on other pollutants(e.g.,pesticides)requested by the permit writer
'.ENWOF»PART'D:rt' -
REFER TO THE°APPLICATION OVERVIEW-(PAGE 1).'TO=DETE_RMINE.WHICH OTHER_PARTS.
QF'FQRM XYO.0 MUST COMPLETE :.
EPA Form 3510-2A(Rev.1-99) Replaces EPA forms 7550-6&7550-22. Page 14 of 22

FACILITY NAME AND PERMIT NUMBER: PERMIT ACTION REQUESTED: RIVER BASIN:
Triangle Wastewater Treatment Plant, NCO026051 Renewal Cape Fear
Test number: Test number: Test number:
e. Describe the point in the treatment process at which the sample was collected.
Sample was collected:
f For each test,include whether the test was intended to assess chronic toxicity,acute toxicity,or both
Chronic toxicity
Acute toxicity
g. Provide the type of test performed.
Static
Static-renewal
Flow-through
h. Source of dilution water. If laboratory water,specify type;if receiving water,specify source.
Laboratory water
Receiving water
i. Type of dilution water. If salt water,specify"natural"or type of artificial sea salts or brine used.
Fresh water
Salt water
j. Give the percentage effluent used for all concentrations in the test series.
11-7 - :.,: '.c
k. Parameters measured during the test. (State whether parameter meets test method specifications)
pH
Salinity
Temperature
Ammonia
Dissolved oxygen
I. Test Results
Acute:
Percent survival in 100% ado
effluent
LC5o
95%C.I. % % %
Control percent survival % % %
Other(describe)
EPA Form 3510-2A(Rev.1-99). Replaces EPA forms 7550-6&7550-22. Page 16 of 22

FACILITY NAME AND PERMIT NUMBER: PERMIT ACTION REQUESTED: RIVER BASIN:
Triangle Wastewater Treatment Plant, NCO026051 Renewal Cape Fear
Chronic•
NOEC % % %
IC25 % % %
Control percent survival % % %
Other(describe)
m Quality Control/Quality Assurance.
Is reference toxicant data available?
Was reference toxicant test within
acceptable bounds?
What date was reference toxicant test
run(MM/DD/YYYY)?
Other(describe)
E.3. Toxicity Reduction Evaluation. Is the treatment works involved in a Toxicity Reduction Evaluation?
❑ Yes ❑ No If yes,describe:
EA. Summary of Submitted Biomonitoring Test Information. If you have submitted biomonitoring test information,or information regarding the
cause of toxicity,within the past four and one-half years,provide the dates the information was submitted to the permitting authority and a summary
of the results.
Date submitted: / / (MM/DD/YYYY)
Summary of results: (see instructions)
_- ND:OF.:PART-E:,-' - -
:`REFER TO'TH.E-APPL_ (CATION.OVERVIEW-(PAGE•1)TO DETERMINE•WHICH'OTHER.PARTS
_ OF FORM 2AYO,U-MUST'.COMPLETE '
°�--i`)A,. -,1'. .si •_i`JLi i�.k,J.,.d'.� •B• _ �•F.• 2'�%`!_ `iz`•• - dw of`••
EPA Form 3510-2A(Rev.1-99) Replaces EPA forms 7550-6&7550-22 Page 17 of 22

FACILITY NAME AND PERMIT NUMBER: PERMIT ACTION REQUESTED: RIVER BASIN:
Triangle Wastewater Treatment Plant, NCO026051 Renewal Cape Fear
Y
-SUPPLEMENTALAP LICAT16-Willsill
P
'
;.�-,.A,RT F;INDUSTRIA,_,USERIDI CHARGE -AND' CRAJ _k_WAS'
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.I. Pretreatment program. Does the treatment works have,or is subject to,an approved pretreatment program?
Z Yes El No
F.2. Number of Significant Industrial Users(SlUs)and Categorical Industrial Users(ClUs). Provide the number of each of the following types of
industrial users that discharge to the treatment works.
a Number of non-categorical SlUs. I
b. Number of ClUs. 10
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. (All of the Significant Industrial User Information is attached. Total of 11 pages.)
Name:
Mailing Address:
FA. Industrial Processes. Describe all the industrial processes that affect or contribute to the SIU's discharge.
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):
Raw material(s):
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.
gpd 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 is subject to the following:
a. Local limits ❑ Yes El No
b. Categorical pretreatment standards ❑ Yes 0 No
If subject to categorical pretreatment standards,which category and subcategory?
EPA Form 3510-2A(Rev.1-99). Replaces EPA forms 7550-6&7550-22. Page 18 of 22

FACILITY NAME AND PERMIT NUMBER: PERMIT ACTION REQUESTED: RIVER BASIN:
Triangle Wastewater Treatment Plant, NCO026051 Renewal 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.
RCRA HAZARDOUS WASTE RECEIVED BY TRUCK, RAIL,OR DEDICATED PIPELINE:
F.9. RCRA Waste. Does the treatment works receive or has it in the past three years received RCRA hazardous waste by truck,rail or dedicated pipe?
❑ Yes ® No(go to F.12)
F.10. Waste transport. Method by which RCRA waste is received(check all that apply):
❑ Truck ❑ Rail ❑ Dedicated Pipe
F.11. Waste Description. Give EPA hazardous waste number and amount(volume or mass,specify units)
EPA Hazardous Waste Number Amount Units
CERCLA(SUPERFUND)WASTEWATER,RCRA REMEDIATION/CORRECTIVE ACTION
WASTEWATER,AND OTHER REMEDIAL ACTIVITY WASTEWATER:
F.12. Remediation Waste. Does the treatment works currently(or has it been notified that it will)receive waste from remedial activities?
❑ Yes(complete F 13 through F.15.) ® No
F.13. Waste Origin. Describe the site and type of facility at which the CERCLA/RCRA/or other remedial waste originates(or is excepted to origniate in
the next five years).
F.14. Pollutants. List the hazardous constituents that are received(or are expected to be received). Include data on volume and concentration,if
known. (Attach additional sheets if necessary.)
F.15. Waste Treatment.
a. Is this waste treated(or will be treated)prior to entering the treatment works?
❑ Yes ❑ No
If yes,describe the treatment(provide information about the removal efficiency):
b. Is the discharge(or will the discharge be)continuous or intermittent?
❑ Continuous ❑ Intermittent If intermittent,describe discharge schedule.
END,OF PART f _ - -
KF,ER TO THE APP-LICATION-OVERVIEWI JPAGE;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 19 of 22

FACILITY NAME AND PERMIT NUMBER: PERMIT ACTION REQUESTED: RIVER BASIN.
Triangle Wastewater Treatment Plant, NCO026051 Renewal Cape Fear
C
SUPPLEMENTAL •
NIONINFORATIOK' ­,-
�,,APPLICA M
i
A
,PPM W
NED-SEERSYSTEMS
If the treatment works has a combined sewer system,complete Part G.
G.11. 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 discharatRoint.
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)
d. Depth below surface(if applicable) ft
e. Which of the following were monitored during the last year for this CSO?
E3 Rainfall El CSO pollutant concentrations El CSO frequency
E] CSO flow volume El Receiving water quality
f. How many storm events were monitored during the last year?
GA. CSO Events.
a. Give the number of CSO events in the last year.
events (E]actual or El approx.)
b. Give the average duration per CSO event.
hours (E]actual or D approx.)
EPA Form 3510-2A(Rev.1-99). Replaces EPA forms 7550-6&7550-22. Page 20 of 22

FACILITY NAME AND PERMIT NUMBER: PERMIT ACTION REQUESTED: RIVER BASIN:
Triangle Wastewater Treatment Plant, NCO026051 Renewal Cape Fear
C. Give the average volume per CSO event.
million gallons(❑actual or❑approx.)
d' Give the minimum rainfall that caused a CSO event in the last year
Inches of rainfall
G.5. 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(if known).
c Name of State Management/River Basin:
United States Geological Survey 8-digit hydrologic cataloging unit code(if known):
G.6. CSO Operations.
Describe any known water quality impacts on the receiving water caused by this CSO(e g,permanent or intermittent beach closings,permanent or
intermittent shell fish bed closings,fish kills,fish advisories,other recreational loss,or violation of any applicable State water quality standard).
F.
"END OF�,PART_G.'
:REFER"TO'THE-APPLICATION;.-OVERVIEW,(PAGE-1°) TO DETERMINE;WHICH`OTHER;PARTS''-
QF°FORM2A,YOU-MUST2COMPLETE.
2 _ _
EPA Form 3510-2A(Rev.1-99) Replaces EPA forms 7550-6&7550-22. Page 21 of 22

Additional information,if provided,will appear on the following pages. ,
i
'NPDES FORM 2A Additional Information

Process Flow Narrative Description
Wastewater Treatment
The Durham County Triangle WWTP (NPDES Permit # NC0026051) is a 12 MGD Advanced
Tertiary Treatment plant with enhanced 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 continuous fine screens discharging
to the influent pump station, which is equipped with six submersible pumps. The pumps lift the
screened influent to the upper treatment level where the grit removal system and flow
measurement/sampling units are located. After the two physical processes of screening and grit
removal, the influent is directed to the biological treatment process.
Each Modified A2/0 treatment train includes a three (3) cell anaerobic selector for phosphorous
iele`ase, 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 a reaeration zone prior to the four(4) 110-ft diameter 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 suboxic 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).
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 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 food source for
denitrifying bacteria. The denitrified wastewater is re-aerated prior to discharging to the clarifiers
and sodium aluminate is added at the clarifier splitter box to provide additional phosphorus
removal. In the clarifier the biomass is separated from the clarified effluent and is 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 travelling bridge sand filters physically remove the fines from the treated water. The filtered
effluent is then disinfected through the ultraviolent disinfection unit and directed to the post
aeration basin prior to stream discharge or reuse.

Backwash water from the sandfilters is directed to a flow equalization tank. During periods of
high flow or upset, the equalization tank can discharge water to the treatment plant lagoon. The
lagoon could also be used for emergency storage of industrial slug loads.
Biosolids Handling Facility
The Biosolids Handling Facility consists of sludge holding tanks, a dewatering building, a truck
loading station which are located mainly within the footprint of the former southern aeration basin.
The structures are arranged to facilitate the future addition of equipment and additional liquid
waste activated sludge (WAS) storage.
The sludge holding tanks are located adjacent to the dewatering building which is a one story
structure with a basement.The basement houses sludge grinders, and sludge feed pumps.The main
process level houses a control room,test/sample preparation room,electrical room,centrifuge area,
polymer feed and storage area, and the pipe gallery containing the cakes pump and piping area.
Decant and centrate are directed to the same equalization tank that receives sand filter backwash.
If the biosolid dewatering system is offline, sludge may be wasted to the sludge lagoon. The
lagoon provides more than thirty days of storage for waste activated sludge. Use of the lagoon can
result in nutrient release, and therefore, its use is limited.
Reuse Water System
The Durham Triangle WWTP operates and maintains a 5.2 MGD reuse water system (Permit #
WQ0032821). Within the Triangle WWTP reuse water is used for a variety of purposes including
toilet flushing,the HVAC system in the administration building,power washing and yard hydrants.
The reuse water system consists of the following components: four turbine pumps, a hydro-
pneumatic tank, a 500,000 gallon storage tank, instrumentation and metering, a dual disinfection
system and a distribution system. The distribution system includes continuous monitoring of
chlorine, pressure and flow.
Backup Power Sources
The Durham Triangle WWTP operates and maintains 4 generators as a back-up power source for
use when utility power is not available. There is an 800kW generator and automatic switch gear at
the plant headworks, two 1000kW generators and automatic switch gear at the Effluent MCC
Building, and a 1000kW generator and automatic switch gear at the Biosolids MCC Building.

Summary of Submitted Biomonitoring Test
Toxicity
Testing
Collection Method Used
Date Report Outfall Dates of Dates of (*See
Submitted to DWQ Number Toxicity Test Type j Samples Testing Footnote) Summary of Results
f 2/8/2011, 2/9/2011-
2/24/2011 001 Chronic Ceriodaphnia dubia (Pass/Fail) 2/10/2011 2/16/2011 *1 Pass(12.87% Reduction)
5/10/2011, 5/11/2011-
5/27/2011 001 Chronic Ceriodaphnia dubia (Pass/Fail) 5/12/2011 5/18/2011 *1 Pass(-12.27% Reduction)
8/9/2011, 8/10/2011-
8/25/2011 001 Chronic Ceriodaphnia dubia (Pass/Fail) 8/11/2011 8/17/2011 *1 Pass(7.27% Reduction)
' 11/8/2011, 11/9/2011-
11/30/2011 001 Chronic Ceriodaphnia dubia (Pass/Fail) 11/10/2011 11/16/2011 *1 Fail
12/132011, 12/14/2011- Dilutions Of 22.5%,45%, 90%, 95%,
1/25/2012 001 Chronic Ceriodaphnia dubia (Dilutions) 12/15/2011 12/21/2011 *1 100%- Pass(ChV> 100%)
j 1/10/2012, 1/11/2012- Dilutions Of 22.5%,45%, 90%, 95%,
1/27/2012 001 Chronic Ceriodaphnia dubia (Dilutions) 1/12/2012 1/18/2012 *1 100%- Pass(ChV> 100%)
' (Split between Labs)
2/21/2012, 2/22/2012 - Pass (10.08% Reduction)
3/13/2012 001 Chronic Ceriodaphnia dubia (Pass/Fail) 2/23/2012 2/29/2012 *1 Pass(-25.90% Reduction)
(Split between Labs)
5/15/2012, 5/16/2012- Pass(-2.46% Reduction)
6/8/2012 001 Chronic Ceriodaphnia dubia (Pass/Fail) 5/17/2012 5/23/2012 *1 Pass(6.62% Reduction)
' 5/15/2012,
Chronic Fathead Minnow 5/17/2012, 5/15/2012- Dilutions Of 22.5%,45%, 75%, 90%,
6/8/2012 001 (Multi-Concentration Test) 5/18/2012 5/22/2012 *2 100%- Pass(ChV> 100%)
I (Split between Labs)
8/7/2012, 8/8/2012- Pass(4.62% Reduction)
8/28/2012 1 001 IChronic Ceriodaphnia dubia (Pass/Fail) 8/9/2012 8/15/2012 *1 Pass(8.97% Reduction)

(Split between Labs)
11/6/2012, 11/7/2012- Pass(16.88% Reduction)
11/29/2012 001 Chronic Ceriodaphnia dubia (Pass/Fail) 11/8/2012 11/14/2012 *1 Pass(096 Reduction)
(Split between Labs)
2/5/2013, 2/6/2013- Pass(15.27% Reduction)
2/25/2013 001 Chronic Ceriodaphnia dubia (Pass/Fail) 2/,7/2013 2/13/2013 *1 Pass(8.51% Reduction)
2/5/2013,
Chronic Fathead Minnow 2/7/2013, 2/5/2013- Dilutions Of 22.5%, 45%, 75%, 90%,
2/25/2013 001 (Multi-Concentration Test) 2/8/2013 2/12/2013 *2 100%- Pass (ChV> 100%)
(Split between Labs)
5/7/2013, 5/8/2013- Pass(16.10% Reduction)
5/29%2013 001 Chronic Ceriodaphnia dubia (Pass/Fail) 5/9/2013 5/15/2013 *1 Pass,(13.80% Reduction)
(Split between Labs)
8/6/2013, 8/7/2013- Pass(-17.35% Reduction)
8/23/2013 001 Chronic Ceriodaphnia dubia (Pass/Fail) 8/8/2013 8/14/2013 *1 Pass(5.44% Reduction)
(Split between Labs)
11/5/2013, 11/6/2013- Pass (3.41% Reduction)
11/21/2013 001 Chronic Ceriodaphnia dubia (Pass/Fail) 11/7/2013 11/13/2013 *1 Pass(2.01% Reduction)
(Split between Labs)
2/4/2014, 2/5/2014- Pass(16.95% Reduction)
2/25/2014 001 Chronic Ceriodaphnia dubia (Pass/Fail) 2/6/2014 2/12/2014 *1 Pass(-5.44% Reduction)
(Split between Labs)
5/6/2014, 5/7/2014- Pass(11.22% Reduction)
6/5/2014 001 Chronic Ceriodaphnia dubia (Pass/Fail) 5/8/2014 5/14/2014 *1 Pass(19.80% Reduction)
(Analyzed along side of sample
5/14/2014, 5/14/2014- collected by DWR-RRO)
6/5/2014 001 Chronic Ceriodaphnia dubia (Pass/Fail) 5/15/2014 5/,21/2014 *1 Pass(-17.71% Reduction)
(Split between Labs)
8/5/2014, 8/6/2014- Pass (-3.89% Reduction)
9/8/2014 001 Chronic Ceriodaphnia dubia (Pass/Fail) 8/7/2014 8/13/2014 *1 Fail (92% Reduction)
(Split between Labs)
11/4/2014, 11/5/2014- Pass(-14.35% Reduction)
11/20/2014 001 Chronic Ceriodaphnia dubia (Pass/Fail) 11/6/2014 11/12/2014 *1 Pass(0% Reduction)
�T

ww
11/4/2014,
Chronic Fathead Minnow 11/6/2014, 11/4/2014- Dilutions Of 22.5%, 45%, 75%, 90%,
11/20/2014 001 (Multi-Concentration Test) 11/7/2014 11/11/2014 *2 100%- Pass(ChV> 100%)
(Split between Labs)
2/3/2015, 2/4/2015- Pass(-7.37`Yo Reduction)
3/2/2015 001 Chronic Ceriodaphnia dubia (Pass/Fail) 2/5/2015 2/11/2015 *1 Pass (10.31% Reduction)
(Split between Labs)
5/5/2015, 5/6/2015- Pass (-17.19%,Reduction)
6/25/2015 001 Chronic Ceriodaphnia dubia (Pass/Fail) 5/7/2015 5/13/2015 *1 Fail (23.27% Reduction)
(Split between Labs)
8/4/2015, 8/5/2015- Pass (5.43% Reduction)
8/25/2015 001 Chronic Ceriodaphnia dubia (Pass/Fail) 8/6/2015 8/12/2015 *1 Pass(-7.8% Reduction)
8/4/2015,
Chronic Fathead Minnow 8/6/2015, 8/4/2015- Dilutions Of 22.5%,45%, 75%, 90%,
8/25/2015 001 (Multi-Concentration Test) 8/7/2015 8/11/2015 *2 100%- Pass(ChV> 100%)
*1 = "Short-Term Methods for Estimating the Chronic Toxicity of Effluents and Receiving Waters to Freshwater Organisms" 4th Edition,
EPA-821-R-02-013,October 2002. Method #1002.0
*2 = "Short-Term Methods for Estimating the Chronic Toxicity of Effluents and Receiving Waters to Freshwater Organisms" 4th Edition,
EPA-821-R-02-013, October 2002. Method#1000.0

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 Corporation
Mailing Address. 1003 Twin Creek Court
Durham,NC 27703
F.4. Industrial Processes. Describe all the industrial processes that affect or contribute to the SIU's discharge.
Operate industrial laundry
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): commercial laundry
Raw material(s): detergents,builders,bleach and sour
F.6. Flow Rate.
ai7 Process wastewater flowrate 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.
54.500 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.
1,700 GPD ( X 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?
F.8. 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.
Page 1

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 Research,Inc.
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.
Develop and manufacture silicon carbide crystals
F.S. 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)- LED chips and lighting devices
Raw material(s): solvents,abrasives,adhesives,surfactants gases
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.
170.000 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.
266.000 GPD ( X 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?
40 CFR 469 Subpart A&B
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.
Page 2

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
. Metal finishing processes
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): developmental products(film conductors,resistors di-electric paste)
Raw material(s) metal powders,ceramic&glass polymers,acids,thinners monomers carbon nanolubes
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.
1,000 GPD ( continuous or X 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.
21,000 GPD ( X 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?
40 CFR 433.17
F.8. 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.
Page 3

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: Biogen(previously Eisai)
Mailing Address 900 Davis Drive,Suite B
Durham,NC 27713
F.4. Industrial Processes'. Describe all the industrial processes that affect or contribute to the SIU's discharge.
Pharmaceutical research and manufacturing
F.S. 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): Ancept,Aciphex,Tecfidera
Raw material(s): acids butanol starches ethanol glycerol nitrogen sucrose
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.
54,000 GPD ( continuous or X 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
11.000 GPD ( X 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?
40 CFR 439 Subparts D&E
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
r ,
Page 4

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 research and development
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)- R&D laboratories
Raw material(s): organic and inorganic chemicals
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.
6,000 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.
181,000 GPD ( X 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?
40 CFR 439 Subpart E
F.8. 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.
Page 5

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 Boz 12138
Research Triangle Park,NC 27709
F.4. Industrial Processes. Describe all the industrial processes that affect or contribute to the SIU's discharge.
Electrochemical production process
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 metal
Raw material(s)- acids,salts metals
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.
375 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.
1,500 GPD ( X 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?
40 CFR 433
F.8. 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.
Page 6

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: Pearl Therapeutics,Inc
Mailing Address: 4222 Emperor Blvd.Suite 250
Durham,NC 27703
F.4. Industrial Processes. Describe all the industrial processes that affect or contribute to the SIU's discharge.
Pharmaceutical manufacturing
F.S. 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)- meter dose inhalers
Raw material(s): glycopyrrolate,propionate fumarate.MABA
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.
100 GPD ( continuous or X 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.
600 GPD (X 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?
40 CFR 439 Subpart D&E
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.
Page 7

I
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. Phononic
Mailing Address: 800 Capitola Drive,Suite 7
Durham,NC 27713
F.4. Industrial Processes. Describe all the industrial processes that affect or contribute to the SIU's discharge.
Manufacture thermo electric devices
F.S. 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): thermoelectric cooling devices
Raw material(s) nickel.gold
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.
3,000 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.
2,400 GPD (X 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?
40 CFR 469 Subpart A
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.
Paqe 8

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 RTI(formerly NCIDEA)
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
Semiconductor research and development and low scale 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 wafer devices
Raw material(s) acids,bases,salts,metals,wafers solvents plating solutions gases
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
12,000 GPD ( continuous or X 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.
14,000 GPD ( X 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?
40 CFR 469 Subpart A
F.8. 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.
Page 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 Metal
Mailing Address: PO Box 12166
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 process metal powders and brazing paste
F.S. 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): copper,bronze,tin,copper oxide metal powders,brazing paste
Raw material(s): metals acids solvents salts
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.
8,000 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.
13,000 GPD ( X 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?
40 CFR 471 Subpart J
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
Page 10

SIGNIFICANT INDUSTRIAL USER INFORMATION:
Sypply 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: United Therapeutics
Mailing Address PO Box 14186
Research Triangle Park,NC 27709
FA. Industrial Processes. Describe all the industrial processes that affect or contribute to the SIU's discharge.
Pharmaceutical 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): hypertension-drugs
Raw material(s): sulfates,stearates,acetates,acetone
F.6. Flow Rate.(NO DISCHARGE IN THE LAST YEAR.)
a.Process wastewater flow rate Indicate the average daily volume of process wastewater discharge into the collection system in gallons per
_ day_(GP_D).and_whether_the.discharge.is continuous.or_intermittent.
4,100 GPD ( continuous or X 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.
18,500 GPD ( X 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?
40 CFR 439 Subpart D&E
F.8. 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.
Page 11

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USGS 8289741955 NORTHEAST CREEK AT SR1188 HR GENLEE, HC
18.8 , L
- - ----------
L1 '• '
y 7.8 - -
a s.e - - - -- - - I--- --- - -- -
5.8 i -- - - - - - - -
4.8 - _--- -- ---— - --- __- - - -- - ----- - - ; -- - - - - - --- ---
� 1
3.8 - - --- -- - - - --- - ---- �_
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Draft 4-2-15
Remedying Discharging Sand Filters
I. Practice Summary
Dek
Remedying Discharging Sand Filters is the practice of replacing discharging sand filter
onsite wastewater systems serving single family residences,permitted under the general
NPDES permit(NCG550000 or NCG570000),with alternatives that reduce nutrient loading
to surface waters.
Discharging sand filters(DSF's)are residential wastewatertreatment systems that use some
form of pretreatment beyond the primary treatrnent,:�i'; provides and are
permitted to discharge to surface waters,ditches,or the urface.There are four
major types of DSFs and three possible remediesAOreplace/rev�ai'Mor eliminate any of these
z
types.
if.'4.
,�­
Four Major Types of Discharging Sand FilterXsKi_,�r4.
1.Gravity-dosed, single-pass sand,filters with reg' Mr
2.Gravity-dosed, single-pass sand-411ters with no or infrequent discharges (unlined or
bottomless systems);
3.Recirculating filters and othercharging s s
a v ce
4.Malfunctioning discharging systerris(with surfacing effluent that can run offsite)
Remedies
1.Discharging TS41,,EquivalenfTfutrogen r t.' System
&
2.TS-11 w/SubsurfaSoil Disp;Arsal System 'J"
3.Connecticimto Permitti�d,M'�ijb;r�,.,�f,4,PbES Syst
Wh6hAmplem6fitM';,these remedies would",fei�ult i" nutrient load reduction credit that can
N;� N-"'I i�'
lfipn requiremeMs under
be-L'Oblunted towards-1 Id reda� applicable Division nutrient rules.
As dis&arging system§ DSF s a&',JYeated on an individual basis,unlike malfunctioning
1W,
septic sy"'s'fems,which ark6ddressed4bn a programmatic improvement basis.
NU
U t i L,ty'
Discharging sand4ilter systems are typically found in areas where drainage issues make
soils unsuitable for`conventional onsite septic systems. Replacing discharging sand filters
with other systems or-connecting them to municipal wastewater treatment plants may be
a cost effective means to earn nutrient reduction credit for counties and municipalities that
have a significant numbei of these types of systems.
In some cases the proximity of existing sewer lines will make connection to permitted
NPDES wastewater treatment plant the most viable option. In cases where sewer is either
unavailable or cost prohibitive,replacement of the DSF system with a TS-11 or equivalent
system may still be a cost effective approach to achieve nutrient reductions.
Remedy Discharging Sand Filters 1 April 2015

Draft 4-2-15
Nutii6init_ -jeditin Overview
Replacement • Varies depending on type of system being replaced,type of
On-Site system it is replaced with,and number of bedrooms each
system serves.
• Nitrogen:4.3 lbs/yr(2 BR home)- 10.9 lbs/yr(5 BR home).
• Phosphorus:-2.8 lbs/yr(discharging)- 6.6 lbs/yr
(subsurface).
Connect to WWTP • 100% reduction credit for thrDSF load connected to the
VVVVTP for treatment.
Assignment "lie
The Division utilizes a tiered measures appro'Ma"10system reflectin'e,&devel of confidence
associated with estimated load reductionsrai-�Mheir sustained perforii6nce based on review
described of the information evaluated.The tiers are des Nbed in detail in DWR'Xp'��"
ptypal Framework For
Alternative Nutrient Load-Reducing Measures.
Measures that remedy dischargm dfilte assigned a Tier Il designation,which
,g.san rs have 5��n�assigned
-v%j P'N
reflects the existence of applicable r
ieseai'ch,,data.Tier II} receive the currently
established credit at the time of instWIAtibrf'fdrjitsJunction lifetime along with the
potential for increased,credit under Ekisting Deve'lbpment accounting as a result of
refinements to the,_e's h findings.
credit values based,6i.i�-dd.itional'r�gearc
k"
II. Design and h4-lemen,6tion Guidance
6AMD&-Wified Practice-Descriptions
There are threeFtypes of=creditable4heasures available for remedying discharging
sand filters and riialfunctionmg discharging systems.
Ni _�
1. Dfsl�_ichargmig TS-IVEquivalent(nitrogen reducing)System
2. TS-IF*W/
,t$ubsurfa66.Soil Dispersal System
3.Connectio'nto PermAtted Major NPDES System
1.Upgrade to Discharging TS-11 Equivalent (nitrogen reducing) System
This practice involves the installation of a DWR-approved advanced
treatment system,which currently includes recirculating sand filters and
EZ Treat and Orenco AdvanTex proprietary recirculating media filter
systems.
2. Replacement with TS-II System w/Subsurface Soil Dispersal
This practice involves the installation of a OVVPB-approved advanced
treatment system.The main difference between this remedy and remedy
Remedy Discharging Sand Filters 2 April 2015

yr1 ,
Draft 4-2-15
1 is the dispersal method used for the effluent. This remedy uses an
advanced treatment system that disperses effluent to a properly
functioning subsurface (onsite) drain-field. For both of these remedies,
the exsitu treatment system is the same,but effluent management is
different.
3. Connection to Permitted NPDES System
This practice involves decommissioning (ending use) of the discharging
sand filter or malfunctioning system and connecting the residence to a
sewer system and permitted NPDES wastewater treatment system such
as a municipal WWTP.
x '
tra`sFt � •A
B. Design Standards '
1. Design Standards for Discharging T.§41 Equivalent Aci,vanced Treatment
Systems I I%Nt
Discharging TS-II equivalent systems,permitted by..D musfadhere to the
standards,limits,management practice9j nd r�epoTting requiremehr%provided
in the general NPDES p(
"Q1,o ,NCG570000) to which they are
subject. ; eo,4 :'
:. ;J
Electronic versions of each perfound on fhee..DWR website here:
http://portal.c'en .org/web%kwq/swp/,ps/npdes/generalpern is
2. Design-' forTS-II Advaricyd Treatmerit�Systems
Major installation requir ments fo a11;OWPB approved onsite systems,
including requu,emeennts,such asset ba 's, rom wells, design flows,and minimum
-.,,e'i' cal se aration-Are.estabh's_`hed�;in 15A.NCAC 18A .1900 et seq. Specific design
elements-for-4,11 TS-IIA�dvanced treatrnenr systems are addressed through
,mss existing regul`a'tions provided in 15A NCAC 18A .1969 and 1970.
T5Ac,NCAC 18A .1969 Approval and Permitting of On-Site Subsurface
;`'�k ,=
Wastewater Systems;'T`echnologies,Components, or Devices" provides the
processAllrough whichra product or system not specifically listed in the 15A
NCAC 18A 4900 Sewage Treatment and Disposal System rules,can be approved
for use in sub�surfacejwastewater systems in North Carolina.
y
15A NCAC 18A .1970 "Advanced Wastewater Pretreatment Systems" establishes
advanced pre-treatment performance standards. It addresses TS-II system
effluent quality standards,siting and sizing requirements,vertical separation
requirements,horizontal setbacks,and design,installation requirements,
inspections,and permitting.
Rules 15A NCAC 18A .1900 can be found at:
ht!p://ehs.ncpubhchealth.com/oswp/docs/rules/`­Aug98amen.12
Remedy Discharging Sand Filters 3 April 2015

r
Draft 4-2-15 a
3. Approval of Experimental and Innovative Systems
Onsite wastewater design professionals may propose experimental or innovative
systems that remove nutrients better than the system being replaced. Such
departure from requirements set forth in 15A NCAC 18A .1900 et seq. requires
that an applicant provide technical justification to OWPB of DENR per guidance
dated October 2013.This guidance requires information demonstrating that the
proposed system design is equally or more protective of water quality than the
system being replaced. Vague,anecdotal or isolated evidence is not acceptable.
If approved,alternative designs may receive lower regulatory credits,based on
case-specific review. fir '
f
Guidance on Experimental&InnovativeLaws;}Rules&Approval Process-
OWPB October 30,2013
hgp://ehs.ncpubhchealth.com/oswpf'd'ocs/products/IE.Procedures-
10302013.pdf
C. Installation /Operation & Maintenance,;'
General Installation requirements, mamtenanceiprocedures and inspection
frequency for OWPB apprroved�S II systems ale provided in 15A NCAC 18A
.1900 et seq. 15A NCAC 18A=:1M9704tem,(I) provides spec. is installation and
construction instructions for approved�TSrIIrsystems:=Innovative and
experimental;systeins are required to be nista-lli d by amanufacturer-authorized
installer a cc ord g o fe manufacturer s.'uist llahon,specifications and system-
specific installation conditions prescribed in the products Accepted System
approval doc fent on the OWPB website.
N-N,
DDW£RLp6h itted TS=II(;equivalent systems must adhere to the standards, limits,
.�x-'-management�practices,a d reportingZrequiremenfs provided in the general
I'
permit�(NCG5500,00 or NCG570000)to which they are subject. It is
'
'(recommended th!Wlocal governments planning to achieve nutrient reduction
credit:using these measures adopt USEPA's Decentralized Management Model II
�i-..� N--h.A
to imi,e the overall_`management of these discharging systems. The key
provisions.of this model program include a requirement that service contracts be
maintaiiled�,nventories of systems, and tracking of service contracts. A link to the
USEPA guida`n&document is provided below.
W
Voluntary National Guidelines for Management of Onsite Wastewater Systems—
USEPA March 2003:
htti):Hwater.epa.gov/scitech/wastetech/upload/septic guidelines.pdf
D. Reporting Performance Verification
System performance and reporting for OWPB approved TS-II systems is
described in Item(n) of 15A NCAC 18A .1970.This item requires each installed
Remedy Discharging Sand Filters 4 April 2015

Draft 4-2-15
system to be monitored by a certified wastewater treatment facility operator
(ORC). Annual performance reports are required and submitted to the local
health department by the ORC. The type of monitoring and frequency varies by
system type, the designated performance standard, system flow,and history
performance. These parameters are described in the systems approval document
on the OWPB website and in sub-items (n)(1) through (n)(5) of rule .1970. Site
and system compliance with the performance standards is determined by the
requirements described in sub-item(o) of the same rule. In order to track credit
and ensure continued credit,copies of the system performance reports will be
required by DWR.
DWR permitted TS-II equivalent systems must, ere to the reporting
4. - .?'T
requirements provided in the general NPDES peririrt; CG550000 or
NCG570000) to which they are subject to. IA
.
,,.
The performance verification for reductions achieved through connection to a
t-,:
permitted NPDES permitted facility illbe handled througli,"e�WWTP's annual
discharge reports provided to DWR# '-N t= .
E. Planning Level Cost Information _;
The cost of implementing+Ae vafio us rremedies�&s�cribed in this chapter is highly
variable and site specific. For,instancd,,connectionitp an existing NPDES
permitted discharge (WTTP) varies by-municipality�­and can cost as little as
$2,500. However;tlus,low end estimate assumesxa sewer,'lule is accessible in a
location cl seethe home'desiring t con�neef.existing sewer lines are not nearby,
connecting, 4he city s'Sewer system;can be considerably more expensive and
would likely"hot be a cost-effective option.
_. - ._ _ ____ :;:Advanced TS.ILand�equivalentaystems'_can.range_in.costs.any_where.from.$15K. - - --
$25K oii tall depending on sopography,and other site specific
-•, onditions.Ultimately thecost effectiveness of each remedy must be assessed on
_.,.:.c
a'Mte by site basis by,,the ju"r-sdiction and homeowner to identify the most cost-
effective approach: ,
4
Remedy Discharging Sand Filters 5 April 2015

Draft 4-2-15
III. Nutrient Credit Estimation and Tier Assignment
A. Nutrient Credit Summary
This section summarizes the nutrient credit awarded for each of the three
remedial alternatives addressing discharging and malfunctioning sand filters.
The baseline loading rates and reduction credits included in Table I&II come
from Tetra Tech, 2013. For context,the baseline nutrient loading rates for DSF
systems are considered to be less than direct septic tank effluent discharge,
which is estimated to have per capita nutrient loading rates of 11.0 lbs/cap/yr
TN and 1.81bs cap yr TP.
f s?:.1�:11%j
Replacement systems shall receive the following c-redits if designed,constructed
and maintained in accordance with OW,PB Rules. Please note that maintenance
1 A ,�'�
of credit is contingent upon comphancejwith proper mauKtenance and inspection
schedules.
Table I. TN Load Reduction Credit Matrix
DS'FMoading Upgrad6jo TS-II w/ Connection
Rate#�,,. Dischar'ii to major
System ,. �_jiN Subsurface
TS Soil Soil NPDES
Equivalent � Dispersal System*
�.
moi;
�.-ia� '`
};4 t(lb/cap/year) (`b/xap%tiyear)=,(lb/`cap/year) (lb/cap/year)
Remedy Loading v --
_ 4.4 .13
• '��ti. �` - ;y�i" � .-,. _tet":: .�_" .':'`,�:., .j- f�.S;=•_-•'. 'y.a �...y:;'J,"-.,.;u.�"_ ••�;�
YP, `�'``�'��'' `" � �'`�°'•'� ��'� :rRemed'y,7Load;ReducHon�Cr'edit 4r�' r
Single-p sw egular
r. ,� �Y. 7.4 _ 3.0 y 7.3 h 7.4
dischar es a -
Single,pass w/no 3.0 7.3 7.4
ori _
infrequent discharges �'' ' 7,-'4
�.�
Recirculatgfilters and
other gi g advanced%dischar n � 9 4.4 -- 4.3 4.4
, .,.,�
systems
Malfunctioning di`schargingf
systems 7.4 3.0 7.3 7.4
*Assumes all load transferred to major NPDES sector
Remedy Discharging Sand Filters 6 April 2015

Draft 4-2-15
Table Il. TP Load Reduction Credit Matrix
DSF Loading Upgrade to TS-11 w/ Connection
Rate Discharging Subsurface to major
System TS-11 Soil NPDES
Equivalent Dispersal System*
(lb/cap/year) (lb/cap/year) (lb/cap/year) (lb/cap/year)
Remedy Loading Rate 1.8 ti
0
;Types DSFs r<"&Ie �eo - euci
A
Single-pass w/regular
1.8
1.8 1.8
discharges ni
Single-pass w/no or 0.9 ( 09) 0.9
infrequent discharges
Recirculating filters and
other advanced discharging 1.8 1.8 04� 1.8
systems
1.8
4"-8
1.8
systems
Malfunctioning discharging
V,
Assumes all lodiv
a6fe;" ajor NPDES sector *8;,
B. Nutrient Loa&keductio'n"�Ere itMethod
t. thod is,",-6traight for rd calculation that compares the remedy
The load estimatiorNIZ6
measure!sA'6a:d4o the ofiftal a -djoad of"the DSF. To determine the reduction
-credit,;';Ihe'ddad-.f6f-.the.remed.-,y,is-subtf6cf6d,,frofti,'fhe-baseline-load.of-the.system.it.is-
rep acing. The loadi4gsyalues,,�i,-h',,-TablI&1
e 14_iiW
IN _,,ove represent the resulting TN&TP load
reyiMon credit valueg?"Ibs/cap/...,year from implementing the listed remedy. To
N�-FW�-� i',�
calcul&e-_�,,Ihe per unit TM&.1-TP load"Ni_&duction credit the per capita credits are then
multiphe&g,3,�she numberbf,people ihithe household where the repair takes place (Table
Table 111. 'Xgsume- f Number People Per Household of Various Sizes
Number of
Number of Bedrooms Persons
<2 1.5
3 2.2
4 2.9
5 3.7
Each Additional 0.7
Remedy Discharging Sand Filters 7 April 2015

Draft 4-2-15
With discharging systems,it is assumed that the nutrient load delivery is equal
to the effluent concentration(i.e.,no attenuation of nutrients between the
discharge point and surface water) multiplied by an average annual flow
estimate. One significant element of load estimation remains unaddressed,that
being the extent of landscape attenuation before the practice discharges to
flowing waters.Given that the remedies vary from discharging to ground
absorption,to sewer connections,the effect of landscape attenuation relative to a
DSF varies from no difference to significant. In addition,landscape attenuation
bears on the absolute estimate of the"before' DSF:ca e. For both reasons,
X,,:,
landscape attenuation is particularly relevant tolhis practice and should be
addressed.The Division will seek to do so thrbugl�a�separate process with
broader applicability.
C. Tier Assignment and Basis f
Based on the fact that remedy syste ris,have been studieddrresults were used
\--N � s
to develop credits,each of the three remedies for discharging S4tiari"'\ filters has
%IIINZ 4A
been designated as receiving Tier II appfbval Tief,--I.1 measures recZHV,e the
currently established credit d'f he time of installation for its functioning lifetime
along with the potential fo`,increased credit under Existing Development accounting
as a'result of refinements to the-established credit values based on additional
research findings. `
qt7-�., -.1L"W'�it_^-
To evaluate the relati�v/e confidence�i`n the:ineasures>estimated reduction,Division
staff considered a rangeof factors regarding the technical information
_IAN }f Ia X--
supporting 11�the;�measure:-,These evaluation factors provided in the document
DWR ApprovaMrocess:,for Alternative Nutrient Load-Reducing Measures" are
''.d
tissd in
'iscsu "
A _ b=fim-%1`'3 below".
M 1. Supporting Research Summary
�h Supporting;researc,:.!9?e%valuated using a matrix of factors including the
I-� t YT.4i"1
number and:diversity 4studies,study setting,range of conditions
-i
captured,how-well a study exemplifies the expected design of a measure,
`a-fid whether-the nutrient measurements of the study represent delivered
load:or_uses delivery assumptions. Each study is further assessed based
on stiidy;tune period,sampling scheme,field methods,and whether or
not it is peer reviewed. In some cases not all of these factors may be
applicable.
With regard to establishing baseline loading estimates for discharging
sand filters there is not a significant amount of peer reviewed published
data for the exact types of systems used in North Carolina.There is
however supporting data specific to the Falls Lake watershed for DSF
systems with regular discharges. Baseline loading for these types of
systems was estimated using monitoring the data from the DWR-RRO
and studies conducted in Durham between 1999-2000 and 2008. The
Remedy Discharging Sand Filters 8 April 2015

Draft 4-2-15
dataset includes results from 30 samples from 16 systems collected
between 1999-2000 sampling period and 9 samples from 9 systems
analyzed in 2008.This data is documented in City of Durham Stormwater
Services, 2008.
There are no specific studies available addressing malfunctioning DSFs
and DSFs with no or infrequent discharge. Baseline loading for these
systems is derived from the same supporting research used for DSFs with
regular discharges and applying loading assumptions supported by the
findings of the Chesapeake Bay On-site Wastewater Expert Panel. The
panel's findings are documented in Recommendations of the On-Site
Wastewater Treatment Systems Nitrogen Reduction Technology Expert Review
Panel, 2014.
.The loading estimates for the proposed onsite DSFs,remedies,TS-II and
equivalent systems,is base&6w e OWPB TS-II performance standards
which require a 60% reduction�m TN. OWPB requires'Rubstantiating data
to be submitted in conjunction: ith determination of wl'i`e"t�h�`_err an
alternative product qualifies for TS;I1 approV al. The origindl j is for the
assumption nutrientreduction for T&r.1-.,,systems was made based on
multiple studies, so,^ne<from NC but included data from other states as
1 rli N c ar
well. In both cases some of'Zthe�data was published and peer reviewed
while some was not. This dataused,in conjunction with other published
data from the Chesapeak6Bay Expert"Panel Report is used to estimate
pot retial%`reductions in�TN an/,TPfor-the�proposed DSF remedies.
The 'hinited amount of North Carolina and watershed specific data
r available for estunating effluent loads from DSFs systems and their
medias limits��"the overa1dive slty of conditions and design types _
conside-red. Furthermore, the,nutrient measurements provided in the
r.;?� ti'��, . `moi:�
S„ ma ori , of the studies evaluated are end of system effluent loads and do
�s not represent delivered�load to surface water. Nutrient loads from DSF
systems is highly de endent on sites specific characteristics and discharge
--��_��� Y �g.�y p '�, P g
`" -
,�=,lo,�ation relative to surface water,further adding to the uncertainty of the
``estunated baseline and remedy nutrient loads.
2. Measure Design & Operation Specification
Design rules were subjected to a rigorous public process and scrutiny by
technical experts,as such these design and operation requirements are
considered reliable and sufficient for the purposes of sustained nutrient
removal function. It is essential to sustained nutrient removal that single-
family discharging systems receive ongoing operation and maintenance
by a professional management entity or certified contract operator.
Overall,while some amount of performance variability must be assumed
associated with variation in actual levels of operation,practice O&M
specifications are fairly well developed,helping to minimize additional
uncertainty regarding operational based loads.
Remedy Discharging Sand Filters 9 April 2015

Draft 4-2-15
3. Load Estimation Methods
Evaluation of confidence in the load estimation method involves a review
of the scope and complexity of the input and operational variables. It also
includes determining whether there is supporting research data,user
guidance,consideration for physiographic/ climatic settings,and the
ability for the tool to be updated with future improvements when new
research becomes available.
In this case, the load estimation method is astr�aight forward calculation
that compares the remedy measure's load*,&H Table 11 to the original
estimated load of the DSF from Table L- ch adds no uncertainty to the
assessment. -re
IV. Co-Benefits
`
The focus of this guidance is nutrient load'--
reductions through remedying discharging
sand filters. However,it is important to re oSgnize that nutrient reduding measures such
as those described in this chapter may result iii other benefits to"the eri onment and
quantifiable ecosystem services that addtto,theiri,overall value and,desirability. In
the case of remedying DSF's,add ti©nal benefits may:b&lunited to additional reduction
of fecal coliform levels through'the elimination of surface+discharges or through
additional treatment prior to discharge.
.
4oft
'C .
WN
,r
NA
,ham
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Remedy Discharging Sand Filters 10 April 2015

' Draft 42-15
V. References & Resources
15A NCAC 18A .1900 "Laws&Rules for Sewage Treatment&Disposal Systems
15 NCAC 18A .1969 "Approval and Permitting of On-Site Subsurface Waster Water
Systems,Technologies,Components,or Devices"
15 NCAC 18A .1970 "Advanced Wastewater Pretreatment Systems"
h!!p://ehs.ncl2ublichealth.com/oswp/docs/rules/Aug28am'en.vdf
CBPO. 2013 Recommendations of the Onsite Was tezuaterTrMtment Systems Nitrogen
Reduction Technology Expert Review Panel, Draft Fina'I Re"47p'rt: Onsite Sector Best
Management Practices Panel,Chesapeake Bay,;Program Offi eQU.S. Environmental
Protection Agency. `'"
DWR-NPDES General'Permits NCG550000&,NCG570000
http://yortal.ncdenr.or web/wq/swp/ps/npdes/ e�ralpermits, °
City of Durham Stormwater Services'2008. Nutrient arid`Bacteria Characterization of
Surface Discharging Sand Filter Systems' ;3'
DHHS. 2013. Experimental and Innov 'fie Lazus, Ruls,and App`r6val Process. Prepared by
the DHHS DEH Onsite Wastewater Profeetion Branth,,(OWPB)' October 2013.
http://ehs.ncpubl'icliealth.coiWoswp docs/_aproducts/°ISE=PTrocedures-10302013.pdf
•�Al :.
Hazen and Sawyer. 201`3 A Review of Onsite Wastewater System Performance and Nutrient
Trading Pglicy4o Suppo tZ'Xls,Eh- 'y t"14 nt Strategy Development. Report Submitted to
Nu ,
zvt-tn ?QP.F,,.. t5rAo': .ca-n
-Gity--of=:RaleighMPubhc—Utilitie's;Deparfinent�Januar-y 2013-- - - - --- -
-3 : w,
Metea&and Eddy. 2003 _Wastew'a&-InEngineering, Treatment and Reuse. 4th ed. McGraw
Hill Higher,Education,N'el, ork, NY
�s
Tetra Tech. 201.3-Worth Carolina Piedmont Nutrient Load Reducing Measures Technical
Report. Report Submitted to,,D%'vision of,Water Resources,September 2013.
- t
USEPA. 2003. VoluntarytNationa1 Guidelines for Management of Onsite Wastewater Systems
http://water.epa.gov/scitecli%wastetech/upload/septic guidelines.pdf
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INFLUENT AND EFFLUENT CRITERIA
INFLUENT LOADINGS
F U T 1 POTP$$IUM HYDRO%IDE AoOROW,AVERAGE DAILY 4.5 MGD 12.0 MGD P07ASSIUN ryYDRO%IDE FEEDROW,PEAK DALY 9 D MGO 24.0 MGD
ROW.PEAK HOUq!Y 200 MGD 36,0m 0D
8005,CONCENTRATION /I SODIUM AWVINATE P
BODS,4A55 9,3855 Ibs/d 25,020 Lbs%
TSS.CONCENTRATION IBD mg/1 180 m9/I �OSODIUIJ PIUMINq IE FEEL
TSS,MASS 6,755 Iba/d 18,02D Ibs/d
TNN•CONCENTRATION40
7KN,MASS 1,500 ID/dd 4,0 D IEf 40 S
/d
NH3-N,CONCENTRATION POLYMER O I\ I I I
NH3-N,CO MASS
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TP.CONCENTRATION 4 mg��I 5 mg/1 b l CPI POLYMER FEED
TP,MASS 15012% 5004 Iba/d RP,$
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TERTIARY P I I I I I
INFLUENT FLOW AND R A S (1 5 O MAXIMUM) SAND
I RAS DISTRIBUTION BOX AS/WA METER FILTERS 11 I I I
NPDE E.T PARCM TERS 10N8 `,T'/' I 5 STAGE BIOLOG'CAL NUTRIENT REMOVAL w ® 5001UM HYPOCHLORRE FEED I I I I
EFFLUENT PARAMETERS INITIAL YEAR T000 DESIGN YEAR 2020 INTERNAL RECYCL= 4 0 MA%) JAY �y p 60
ROW,AVERAGE DAILY 120 MGD EXISTING EXISTING GRIT CLARIFIER FS EXISTING
BODS,CONCENTRATION 5 mq/I 5,ng^ INFLUENT PUMP REMOVAL AND FLOW CLARIFIER BLOWERS
8005,MASS STATION AND SCREENING MEASUREMENT A r E%ISTING UV
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FINAL I I
TSS,MASS
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TP,MASS 10204 Iba / _ SUPERNATE SELECTOR ANOXIC I I I ml I
DO.CONCENTRATION /K 10,204 IDs yr ANOXIC AERATION J 2 J FI I (O
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SCREENING$ EXISTING ' I I
FECAL COIJFORM WASHER GRIT I
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SCUM V
SCREENWGS O �60 C%1 I I I I I I
(1)PERMIT LIMIT IS BASED ON MAXIMUM MONTHLY LOADING OF 8.371 LBS/MONTH TO LANDFILL
NO
WHICH CORRESPONDS TO A CONCENTRATION OF 2 75 MG/L AT 12 MGD GRIT 70 METHANOL FEED ER FEED
1' POLYMI I I I I
(2)AMMONIA LIMIT IS 1 0 MCA DURING SUMMER&1 8 MGA IN WINTER LANDFILL 55 Oofi J IIb,1 I
(AVERAGE MONTHLY CONCENTRATION LIMITS) p•. I I
(3) 1
PERMIT LIMIT IS BASED ON MAXIMUM ANNUAL LOADING OF 10,204 LBS/YEAR ``,,
WHICH CORRESPONDS TO A CONCENTRATION OF 0.28 MG/L A7 12 MCp EO PS V SLL`
ROW METER HOLDING
EQUALIZATION 1 --
BASIN SL CAKE
sw __J SWDCE
1630 KW .�� FOR MAN P I HOLDING TRUCK LOADING LEGEND
&CO EQUAUZAT011 BASIN 2 FACILITY(X2)
'""� '- ''�;--"- - `- ®-SUBMERGED-AERATOR IN VALVES NOT SHOWN FOR CLARITY
..—PUMP"STn710N'-' _ _ "' mlTruTE
® BLOWER
/+ ©CENTRIFUGE 2 ELEVATIONS SHOWN IN NAVD B8
EO BASIN I i4�Lr�Itdr` (-NGVD 29-0.83)
PLANT SCHEMATIC OVERFLOW EXISTING II `' FLOATING DECANTER
NOT TO SCALE SLUDGE S I u6At H>I�'A © GRINDER
LAGOON ✓✓ TRENCH DRAIN
310 13,MCI TL 1f_j¢ ®ROW METER
© PUMP
/( SUBMERGED MIXER
370
300
1 300
'e 290
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F 290
280 -
280
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230 HOLDING ROOM EXIST BN EXISTING OST
A DIST.80 AERATI N
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230
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220 P P STATION
PHASE III LIQUID PROCESS FACILITIES HYDRAULIC220
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Rolelgh,North Corobna 27606
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270 II 271. 0 2 263.79
II I $ m n, N H11L F1 270
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260 II I S_ x = 1B "IR 257.28 6o. OL 254
25 • 260
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260—
—
254 HWL 255 254 HWL - 255 255
254 HWL
249
RECLAIMED 3
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PROJECT NO 6155-5"70
Y DESGNED BY W MASON cm TRIANGLE WASTEWATER TREATMENT PLANT
= DRAB gy JCOMPONESCHI PROCESS SCHEMATIC PILE NAME G-2 dwg
o.,o w.e.sAno.. DURHAM COUNTY,NORTH CAROLINA -
SNEET CHK'D BY - 3100 fA��0a0 Araya-BW]OD
SHEET NO
RW.V NC2M2 RECLAIMED WATER PROJECT &HYDRAULIC PROFILE G_2
CROSS CHK'D BY ToL(912)M7T
o\ APPRCVED By X
RJUNE 2008
EV v�[1• ti0mu
n NO DATE DRWN CHKD REMARKS DATE
NOT OR CO STR TI N