WQ0003281_Annual Report_20220907

* NEW *
IPP Online
Submission Portal
Effective July 1, 2022, Durham County
Utilities Industrial Pretreatment
Program now has an online
submittal portal. The new portal will
streamline submissions, such as
fillable IWS forms, updated guid-
ance documents and plumbing
plan review details, and provide
resources for new and existing in-
dustries. Visit us at www.dconc.gov/
utilities/compliance.
i� Gwdeno:
Submit
. -
P.,y
F.mo 0u.,
,,
E,,,.y,�,1,
oar ,
a G,,,a,„
co r.,,.,,,,.,w,
Triangle Wastewater Treatment Plants
(TWWTP) laboratory staff collects and analyzes
wastewater samples as required by the
NPDES permit and the reclaim water permit
Currently, the laboratory is certified by the
Division of Water Resources Laboratory
Certification Branch to analyze ammonia,
biochemical oxygen demand, total residual
chlorine, conductivity dissolved oxygen, fecal
colform, pH, temperature, and total suspended
solids. Staff determines the age and health of
the activated sludge and dent fes
microorganisms, such as amoebae, bacteria,
ciliates, flagellates, nematodes, rofifiers, and
water bears.
curing Fats, Rags, Oils, and
Grease (FROG) down the drain,
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.
August 31, 2022
Notification:
This Performance Annual
Report covering July 1,
2021 through June 30,
2022. was forwarded to
the NC Department of
Environmental Quality.
Public Notice of the report
was advertised in the
Durham Herald Sun
newspaper and is availa-
ble for review at the
following locations:
Clerk to the Board
200 East Main St.
Main Library
300 N. Roxboro SL
South Regional Library
4505 S. Alston Ave.
Websde
www.doonc.gov/utilities
Certification:
1 certify under penalty of law
that this report is complete and
accurate to the best of my
knowledge. 1 further certify that
this report has been made
available to the users or cus-
tomers of the named system
and that those users have
been notified of its availability.
DURHAM
COUNTY
MQ
L. 1881
Triangle Wastewater
Treatment Plant
5926 NC Hwy. 55 E.
Durham, NC 27713
[phone]
Permits:
Wastewater
Treatment Plant:
NCO026051
- Collection System:
RStorm
00038
water :
NCG 110054
Reclaimed Water:
W00032821
i
Owned and Operated
by:
Durham County
Engineering
8
Environmental Services
Utilities Division
Contact:
Stephanie Brixey
Deputy Director
1111NmmFAJAKK•
0 n November 23, 2021, Durham County placed a temporary hold on all new development
within the Stirrup Iron Creek Pump Station basin. This pump station was last upgraded in
2019 but given the robust development within this area, an in-depth evaluation must be
completed to ensure adequate service for existing and already permitted customers. This
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.
To date, Durham County continues expending all available efforts to understand and quantify what
additional interim capacity may be available through both physical and operational modifications to
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
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
additional capacity will be allocated to the
projects that have been on hold since the
Notice of Temporary Hold was issued in
November 2021. All projects on hold should
have received communication from Utilities
staff. New projects will continue to be accept-
ed for review and flow allocation until the
available capacity has been consumed. While
flow allocation will be reserved at the time of
construction plan submittal, flow allocation will
not be issued to any project until it has met all
of Durham County Utilities' requirements and
approvals.
The County has initiated the Phase 2
improvements study and anticipates receiving
preliminary feedback from our consultant in
September 2022. Once that consultant feed-
back is received, a course of action regarding
the potential for adding another pump for
Phase 2 can be determined. Similar to Phase
1, this will be a finite solution in offering
limited additional capacity until the construc-
tion of the new Chin Page Pump Station is
complete. The estimated additional capacity
from Phase 2 is unknown as it requires
additional system modeling and testing.
The County is currently working to purchase a
suitable site where the new Chin Page Pump
Station will be located. Additionally, the
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 'Notice to
Industry' will be issued once the exact timeframes for the new Chin Page Pump Station are
established.

Collection System
urham County owns and maintains a
wastewater collection system which
includes 105 miles of gravity sewer, 11
miles of pressurized force mains, and
13 pump stations.
In the past 12 months Durham County had one
reportable spill.
On June 15, 2022, a spill estimated at 850
gallons of wastewater occurred due to a
communication contractor boring into an 18"
abandoned forcemain.
Durham County Utilities prides itself on providing
a high level of customer service. All commercial,
industrial, and residential customers' questions
and concerns are responded to in a timely man-
ner. If you have a question or concern regarding
the collection system, services, or any item cov-
ered in this report, please call [phone] or
send an e-mail to [e-mail].
jects &
Rehabilitation
hroughout the last year, the County has continued its
efforts to rehabilitate aging collection system
infrastructure and increase sanitary sewer capacity to
facilitate economic growth in our service area.
Some completed projects include:
On Miami Blvd. between NC 54 and Page Rd., 1,770 linear
feet of 8" clay pipe was rehabilitated by applying a seamless
liner (cure in -place pipe);
� Anew grinder was installed at the Stirrup Iron Pump Station;
Twelve manholes
were rehabilitated;
The TW WTP's BNR Train
41 interior basin was
cleaned, sears were
repaired, four rotor
baffles were coated,
four rotors were
replaced, and four
variable frequency
drives were installed.,
and;
coated
1E
� Four medianol pumps
replaced attheTW WTP.
Methanol ploys a crucial role In reducing
envimrnenta/ly.damaging effluent that is
dhcharged by wastewater treatment facillhex
Through a process known as'denitdfaod n the
ew¢ nitrate is convertM into nitrogen gas whkh
is Men vented into the om[Whoe eGnbotbg oW
bborn In watersheds and bbdts mygtn and sunlight
from rea.W g mane life below the
Methanol It Meinaa rnon mw* cornpouna uad
b deni ryJ w vn, a¢ekrating the oaivity of
onerahk bacteria that break down harmful
Biosolids System
TWWTP generates biological residuals
(approximately 5,928 wet tons per year), which
are dewatered by centrifuges. The dewatered cake
(approximately 1,194 dry tons per year) is trans-
ported to McGill Environmental Systems, where it
undergoes further biological treatment to produce a
Class A biosolid. These biosolids are beneficially
used as soil amendments in commercial landscap-
ing and agricultural activities.
Treatment System & Process
The Influent Pump Station (IPS) is used to pump raw wastewater
(sewage) to the treatment process to be biologically treated. The IRS 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.
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
The Clarifiers are where the biomass is separated from the treated
wastewater and then is returned to the BNR for further treatment.
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
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