WQ0032821_Annual Report_20220829

DURHAM COUNTY
Triangle Wastewater Treatment Plant
PERFORMANCE ANNUAL REPORT
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Triangle Wastewater
STIRRUP IRON CREEK BASIN

Treatment Plant
n November 23, 2021, Durham County placed a temporary hold on all new development
5926 NC Hwy. 55 E.
within the Stirrup Iron Creek Pump Station basin. This pump station was last upgraded in
Durham, NC 27713 2019 but given the robust development within this area, an in-depth evaluation must be
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completed to ensure adequate service for existing and already permitted customers. This
[phone]
has impacted all projects within the Stirrup Iron Creek Pump Station, Page Point Pump Station, and
____________
Page Park Pump Station basins that have not already been issued system capacity. This includes
new projects, projects currently in Site Plan review, projects that have Site Plan approval which have

not submitted Construction Documents to the County, and existing customer capacity increases.
Permits:

To date, Durham County continues expending all available efforts to understand and quantify what
Wastewater
additional interim capacity may be available through both physical and operational modifications to
Treatment Plant:
the existing Stirrup Iron Creek Pump Station. The County executed engineering studies to inform
how much interim capacity may be added to the Stirrup Iron Creek Pump Station. Those reports
NC0026051
were submitted to the NCDEQ on May 23, 2022, and in June 2022 NCDEQ approved the flow study

which resulted in additional capacity of one million gallons per day. Approximately one quarter of that
Collection System:
additional capacity will be allocated to the
projects that have been on hold since the
WQCS00038
Notice of Temporary Hold was issued in

November 2021. All projects on hold should
have received communication from Utilities
Stormwater :
staff. New projects will continue to be accept-
NCG110054
ed for review and flow allocation until the

available capacity has been consumed. While
flow allocation will be reserved at the time of
Reclaimed Water:
construction plan submittal, flow allocation will
WQ0032821
not be issued to any project until it has met all
of Durham County UtilitiesÓ requirements and
____________
approvals.

Owned and Operated
The County has initiated the Phase 2
improvements study and anticipates receiving
by:
preliminary feedback from our consultant in

September 2022. Once that consultant feed-
Durham County
back is received, a course of action regarding
the potential for adding another pump for
Engineering
Phase 2 can be determined. Similar to Phase
&
1, this will be a finite solution in offering
limited additional capacity until the construc-
Environmental Services
tion of the new Chin Page Pump Station is
Utilities Division
complete. The estimated additional capacity
___________
from Phase 2 is unknown as it requires
additional system modeling and testing.

Contact:
The County is currently working to purchase a
suitable site where the new Chin Page Pump
Stephanie Brixey
Station will be located. Additionally, the
Deputy Director
County is finalizing a preliminary engineering
report to be reviewed by NCDEQ officials that will guide the final design for the new Chin Page Pump
Station. Once able to initiate construction, the County anticipates the project will take approximately
three years until completion given the significant scope of the project. A subsequent ÒNotice to
IndustryÓ will be issued once the exact timeframes for the new Chin Page Pump Station are
established.

#®««¤¢³¨®­ 3¸²³¤¬
0±®©¤¢³² lj
urham County owns and maintains a
wastewater collecon system which
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includes 105 miles of gravity sewer, 11
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miles of pressurized force mains, and
hroughout the last year, the County has connued its
13 pump staons.

eorts to rehabilitate aging collecon system
In the past 12 months Durham County had one
infrastructure and increase sanitary sewer capacity to
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facilitate economic growth in our service area.
reportable spill.

Some completed projects include:

!On June 15, 2022, a spill estimated at 850

!On Miami Blvd. between NC 54 and Page Rd., 1,770 linear
gallons of wastewater occurred due to a
ŅĻĻƷ ƚŅ Бͼ ĭƌğǤ ƦźƦĻ Ǟğƭ ƩĻŷğĬźƌźƷğƷĻķ ĬǤ ğƦƦƌǤźƓŭ ğ ƭĻğƒƌĻƭƭ
communication contractor ĬƚƩźƓŭ źƓƷƚ ğƓ ЊБͼ
liner (cure in-place pipe);

abandoned forcemain.
!A new grinder was installed at the Stirrup Iron Pump Station;

Before
Durham County Ulies prides itself on providing
!Twelve manholes
a high level of customer service. All commercial,
were rehabilitated;

industrial, and residenğƌ ĭǒƭƷƚƒĻƩƭ͸ ƨǒĻƭons

!ŷĻ ‘‘t͸ƭ .bw ƩğźƓ
and concerns are responded to in a mely man-
#1 interior basin was
ner. If you have a queson or concern regarding
cleaned, seams were
After
the collecon system, services, or any item cov-
repaired, four rotor
ered in this report, please call [phone] or
Coated
baffles were coated,
send an e-mail to [e-mail]. rotor baffles
four rotors were
replaced, and four
variable frequency
drives were installed.,
and;
!Four methanol pumps were
replaced at the TWWTP .
aĻƷŷğƓƚƌ ƦƌğǤƭ ğ ĭƩǒĭźğƌ ƩƚƌĻ źƓ ƩĻķǒĭźƓŭ
ĻƓǝźƩƚƓƒĻƓƷğƌƌǤΏķğƒğŭźƓŭ ĻŅŅƌǒĻƓƷ ƷŷğƷ źƭ
ķźƭĭŷğƩŭĻķ ĬǤ ǞğƭƷĻǞğƷĻƩ ƷƩĻğƷƒĻƓƷ ŅğĭźƌźƷźĻƭ͵
ŷƩƚǒŭŷ ğ ƦƩƚĭĻƭƭ ƉƓƚǞƓ ğƭ ͻķĻƓźƷƩź ŋ ĭğƚƓͼͲ ƷŷĻ
Reclaimed Water
ĻǣĭĻƭƭ ƓźƷƩğƷĻ źƭ ĭƚƓǝĻƩƷĻķ źƓƷƚ ƓźƷƩƚŭĻƓ ŭğƭ Ǟŷźĭŷ
źƭ ƷŷĻƓ ǝĻƓƷĻķ źƓƷƚ ƷŷĻ ğƷƒƚƭƦŷĻƩĻͲ ĻƌźƒźƓğƓŭ ğƌŭğƌ
Ĭƌƚƚƒ źƓ ǞğƷĻƩƭŷĻķƭ ğƓķ ĬƌƚĭƉƭ ƚǣǤŭĻƓ ğƓķ ƭǒƓƌźŭŷƷ
ŅƩƚƒ ƩĻğĭŷźƓŭ ƒğƩźƓĻ ƌźŅĻ ĬĻƌƚǞ ƷŷĻ ƭǒƩŅğĭĻ͵
riangle Wastewater Treatment Plant aĻƷŷğƓƚƌ źƭ ƷŷĻ ƒƚƭƷ ĭƚƒƒƚƓ ƚƩŭğƓźĭ ĭƚƒƦƚǒƓķ ǒƭĻķ
źƓ ķĻƓźƷƩźŅźĭğƷźƚƓͲ ğĭĭĻƌĻƩğƷźƓŭ ƷŷĻ ğĭƷźǝźƷǤ ƚŅ
(TWWTP) operates a reclaimed water
ğƓĻƩƚĬźĭ ĬğĭƷĻƩźğ ƷŷğƷ ĬƩĻğƉ ķƚǞƓ ŷğƩƒŅǒƌ
ƓźƷƩğƷĻ͵
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system. Some of the uses of this
water include: landscape irrigation, industrial
cooling, industrial process water and sewer
cleaning. Approximately 128 million gallons
"¨®²®«¨£² 3¸²³¤¬
of reclaimed water was distributed to
customers during the fiscal year.
WWTP generates biological residuals
The reclaimed water annual average data is
(approximately 5,928 wet tons per year), which
reflected in the effluent annual average data
are dewatered by centrifuges. The dewatered cake
except for the following:
(approximately 1,194 dry tons per year) is trans-
ported to McGill Environmental Systems, where it
!Fecal Coliform - <1 cfu/100 ml
undergoes further biological treatment to produce a
!Turbidity - 0.52 NTU
Class A biosolid. These biosolids are beneficially
!Total Residual Chlorine - 4.5 mg/l
used as soil amendments in commercial landscap-

ing and agricultural activities.

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The Influent Pump Station (IPS) is used to pump raw wastewater
(sewage) to the treatment process to be biologically treated. The IPS is
sized for 12 million gallons per day average flow.
The Fine Screens are used to remove fine materials from the wastewater
such as grit, sand, egg shells, etc. All of the organic materials are washed
off and used in the biological treatment process.
The Five Stage Biological Nutrient System is where all biological treatment
takes place, such as removing ammonia through nitrification and
denitrification processes as well as the removal of phosphorus.
Ultraviolet (UV) System
The Chemical Polishing process removes any phosphorus that is remaining
after the biological treatment process. Methanol is used in this polishing
process to add additional BOD to support the denitrification treatment
In the past year, while
process.
treating 1.5 billion
gallons of wastewater,
The Clarifiers are where the biomass is separated from the treated
the TWWTP was com-
wastewater and then is returned to the BNR for further treatment.
pliant in all sampling
events.
The Tertiary Filters are next in the clarification process which removes all
remaining unsettled biomass in the treatment process.
The Ultraviolet Disinfection
treatment process is used to
remove all disease causing
Efluent Annual Average Data
bacteria without creating
harmful by-products.
The Reaeration stage of the
treatment process adds
dissolved oxygen to the treated
wastewater to meet required
permit limits before it is
discharged to Northeast Creek.
Clarifier

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August 31, 2022
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Notification:
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This Performance Annual
3´¡¬¨²²¨®­ 0®±³ «
Report covering July 1,
2021 through June 30,
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WWTP implements an Industrial Pretreatment
2022, was forwarded to
Program (IPP) to control pollutants which may cause pass
the NC Department of
Effective July 1, 2022, Durham County
Environmental Quality.
through or interfere with the treatment plantÓs processes,
Utilities Industrial Pretreatment
Public Notice of the report
which may contaminate sewage sludge, or potentially be
Program now has an online
was advertised in the
hazardous to workerÓs health and safety. Currently, there
Durham Herald Sun
submittal portal. The new portal will
newspaper and is availa-
are seventy permitted industries that are regularly
streamline submissions, such as
ble for review at the
inspected and monitored to ensure their discharges meet
following locations:
fillable IWS forms, updated guid-
specific permit limits. Fourteen of these industries are

ance documents and plumbing

Significant Industrial Users (SIUs). Biosafety Laboratories
plan review details, and provide
Clerk to the Board
in our service area have also been identified and fourteen
resources for new and existing in-
200 East Main St.
are currently permitted. Several of the Industrial
dustries. Visit us at www.dconc.gov/
____________
Pretreatment Permit holders are required to certify that
utilities/compliance.

their facility has followed biosafety procedures consistent
Main Library
with the fifth edition of the Biosafety in Microbiological and
300 N. Roxboro St.
Biomedical Laboratories, US DHHS -PHS, -CDC and -
____________
NIH for the deactivation of Biosafety Level 1, 2, 3 or 4

materials prior to discharge to the sewer system. South Regional Library
4505 S. Alston Ave.
____________

Website
, ¡
www.dconc.gov/utilities
____________

T
riangle Wastewater Treatment PlantÓs Certification:

(TWWTP) laboratory staff collects and analyzes
I certify under penalty of law

'«®µ¤ 2¤¢¸¢«¨­¦
wastewater samples as required by the
that this report is complete and
NPDES permit and the reclaim water permit.
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accurate to the best of my
Currently, the laboratory is certified by the
knowledge. I further certify that
Division of Water Resources Laboratory
this report has been made
Certification Branch to analyze ammonia,
available to the users or cus-
Durham County Utilities has partnered with
biochemical oxygen demand, total residual
tomers of the named system
RIGHTCYCLE* to reduce landfill waste by
and that those users have
recycling gloves and has diverted approxi-
chlorine, conductivity, dissolved oxygen, fecal
mately forty (40) pounds of glove waste from
been notified of its availability.
coliform, pH, temperature, and total suspended
the landfill by collecting used gloves and
solids. Staff determines the age and health of
sending them to RIGHTCYCLE*. Used prod-

the activated sludge and identifies
ucts are sorted, processed into plastic pel-

lets, and raw materials which are molded into
microorganisms, such as amoebae, bacteria,
new consumer products.
Stephanie Brixey
ciliates, flagellates, nematodes, rotifiers, and
Deputy Director
water bears.
Durham County is committed to vigorously
pursuing sustainable practices in all opera-
tions and continue to make progress related
to our environmental stewardship goals.
ouring Fats, Rags, Oils, and
Grease (FROG) down the drain,
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causes build up inside pipes and
could result in a complete blockage.
Clogged pipes overflow in your home and
in the environment resulting in costly
maintenance and repairs to residents.