NC0024201_2021 System Performance Annual Report_20220221

Roanoke Rapids Sanitary District
P.O. Box 308
1000 Jackson Street
Roanoke Rapids, NC 27870
[phone]
Fax: [phone]
www.rrsd.org
February 21, 2022 CERTIFIED MAIL 7005 3110 0001 6339 1305
RETURN RECEIPT REQUESTED
Mr. Scott Vinson, Regional Supervisor
Water Quality Regional Operations Section
Raleigh Regional Office
Division of Water Resources, NCDEQ
1628 Mail Service Center
Raleigh, N. C. 27699-1628
Re: 2021 System Performance Annual Report
Collection System #WQC00027
NPDES #NC0024201
NCG 110000
Dear Mr. Vinson:
Enclosed please find three (3) copies of Roanoke Rapids Sanitary District's System
Performance Annual Report for calendar year 2021. This report is submitted to meet the
requirements of the NCDEQ policy to promote public oversight of system performance for
reduction and elimination of sanitary sewer overflows (SSO's) from wastewater collection
or treatment works.
If these documents should be provided to additional DWQ personnel; or if additional
information is required, please contact me.
Very truly yours,
Roanoke Rapids Sanitary District
R. Danieley Brown, P.E.
Chief Executive Officer
Enclosures
Cc: Steven Ellis
David Scott
File
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2021
Annual Performance Report
Roanoke River Waste Treatment Plant NC0024201 &
Collection System WQCS00027
Abstract
The Annual Performance Report provides key performance information that demonstrates the
POTW's accountability to ensure Roanoke Rapids Sanitary District's stewardship and prosperity
by addressing its environmental, operations, and maintenance challenges through
transformative process and technology solutions.
Steven L. Ellis I David Scott
[e-mail] [e-mail]
i 7 t.. [ • 11111I11MIIlMMI ' .

I. General Information:
A. Regulated entity: Roanoke Rapids Sanitary District, Collection Systems (C.S.) and Wastewater
Treatment Plant (WWTP), together Publicly Owned Treatment Works (POTW)
B. Responsible entity: Roanoke Rapids Sanitary District, Dan Brown, CEO
PO Box 308
Roanoke Rapids, NC 27870
Phone: [phone]
C. Person in charge/contact
1. C.S.: David Warren Scott, Operator in Responsible Charge (ORC)
Eric Wes Deaton, Back-up ORC
Roanoke Rapids Sanitary District, Distribution & Collection
425 East 11th St.
Roanoke Rapids, NC 27870
Phone: [phone]
2. WWTP: Steven L Ellis, Operator in Responsible Charge (ORC)
Timothy Skipper, Back-up ORC
Roanoke River Wastewater Treatment Plant
135 Aqueduct Road
Weldon, NC 27890
Phone: [phone]
D. Applicable Permit(s)
1. C.S.: North Carolina Environmental Management Commission System -wide Wastewater
Collection System Permit No. WQCS00027
2. WWTP: - National Pollution Discharge Elimination System (NPDES): NC0024201
- Land Application (L.A.): WQ0001989
- Stormwater (General): NCG110000
E. Description of C.S.:
The collection system consists of approximately 158 miles of sewer lines and six lift stations that
serve Roanoke Rapids, Gaston, and portions of Halifax and Northampton Counties, which serves
an approximate population of 17,600. The sewer lines within Roanoke Rapids, Gaston, and all
sub -divisions, which connect to two primary interceptors (outfalls), range in size from 8" to 18".
There are two primary 30" diameter Interceptors transporting wastewater to the WWTP.
Roanoke Rapids Sanitary District
2021 Annual Performance Report Page 1

The Roanoke River Interceptor collects wastewater from basins located on the north side of the
Sanitary District's centralized sanitary sewer system. The Town of Gaston (Gaston basin), is
within the Sanitary District boundary, and Northampton County's decentralized sanitary sewer
system are served by this interceptor. Northampton County discharges to the Gaston basin via
force main connections in four locations: 525 NC 48 HWY (Manhole PC-93), 529 Lawrenceville Rd
(Manhole PC-177), Enviva's connection at 211 Grant St. (Manhole PC-135), and 5957 NC 46 HWY
(Manhole PI-47). The interceptor begins just west of 100 Gaston Road (NC 48 HWY/Roanoke Ave)
in Roanoke Rapids. There are 3 primary basin pump stations and 2 secondary pump stations
served by the Roanoke River interceptor whose pipe sizes range from 18" to 30".
The Chockoyotte Creek Interceptor serves the southside of the Sanitary District's centralized
sanitary sewer system, Halifax County's decentralized sanitary sewer system, and three sub-
divisions located outside the City of Roanoke Rapids: Lake View Park, Greenbriar, and Lincoln
Heights, which are within the Sanitary District boundary. The Interceptor begins adjacent to 1100
Zoo Road. Halifax County discharges via force main at three locations: Manhole-129A (1100 Zoo
Road), Manhole-Q84 (2064 NC 125 HWY), and Manhole-Q85A (1072 County Rd). There is one
primary basin pump station, Greenbriar, along the route. The interceptor pipe sizes range from
12" to 30".
The system has six sewer lift stations. Three stations are in the Gaston basin. The Old Emporia
Road Pump Station serves the Roanoke Chowan Housing Authority, and pumps to the HWY 46
Pump Station. HWY 46 Pump Station serves a Northampton County School, and pumps to the
HWY 48 Pump Station via Gardner Drive. NC HWY 48 Pump Station pumps all flows from Gaston
and Northampton County via an 8" force main suspended from the NC 48 HWY bridge spanning
the Roanoke River to the Roanoke River Outfall. The remaining three pump stations are located
within Roanoke Rapids basins and serve residential and some light commercial customers. Two
of the stations, Belmont and Poplar Springs, discharge to the Roanoke River Outfall while the
Greenbriar Pump Station discharges to the Chockoyotte Creek Interceptor.
F. Description of WWTP:
The wastewater treatment plant is rated at 8.34 million gallons per day (MGD). Peak flow is rated
at 12.5 MGD.
Treatment processes at the wastewater plant include grit and rag removal. This is followed by
primary clarification, trickling filter BOD buffering, biological secondary treatment, activated
solids treatment, secondary clarification, final effluent chlorination/de-chlorination processes,
and final pH adjustment.
During these processes, solids are removed from two locations. Primary clarification removes
settleable solids from incoming wastewater to an anaerobic digestion unit. Here, the solids in
the absence of oxygen, receive pH adjustment, mixing, and heating to produce a stabilized
material suitable for land application. Once the solids are stable, excess water is decanted and
Roanoke Rapids Sanitary District
2021 Annual Performance Report Page 2

returned to the plant for further treatment. The stabilized, thickened solids are treated with lime
for odor control and then removed to a holding tank prior to transportation for land application.
Secondary clarification removes solids from the activated solids process. Here, solids in the
presence of oxygen and mixing, accumulate in excess. They are removed, chemically stabilized,
and added to a holding facility. All stabilized solids are analyzed, and land applied according to
their nutrient value, ceiling limit (mg/kg) and cumulative requirements.
There are two pumping stations distributing wastewater into and through the plant. They are
the Influent Pump Station, which includes an equalization pump, and the Trickling Filter Effluent
Pump Station. The Influent Pump Station has the capacity to pump 20 MGD, the equalization
pump 6 MGD, and the Trickling Filter Effluent Pump Station 27 MGD. Standing by in conjunction
with these pump stations is the Emergency Flood Pump Station with a capacity of 21 MGD to
remove treated effluent from the plant during high river stages which prevent normal gravity
flow discharge. Also, a storm water pump station intercepts site runoff, an unnecessary
treatment load and potential site flooding condition, and removes it before entry to the plant. It
has the capacity to pump 11.5 MGD. Numerous other pumps and mixers are located throughout
the plant to facilitate process control.
II. Performance:
1. C.S:
The performance of the system in 2021 was particularly good. There were no permit violations or
monitoring and reporting violations. The District's Fat, Oil, and Grease (FOG) Program
performed 15 inspections of area restaurants and food preparation facilities (FSE). Full facility
inspections were limited due to the ongoing COVID-19 pandemic. There were no notices of
violation. All FSE were advised to continue following "Best Management Practices" and
maintain maintenance records. The District FOG program is continuing our public education
program. There were no Sanitary Sewer Overflows (SSO) out of the three total SSOs during the
period attributed to FOG in 2021.
The District contracted with USDA wildlife services for outfall cutting, stream debris removal and
beaver management from Chockoyotte Creek located adjacent to its interceptor. This ongoing
work improved access to the interceptor and helped minimize flooding of manholes along the
easement.
2. WWTP:
Over the course of 2021, the Roanoke River Wastewater Plant operated very efficiently. There
was one permit violation and no monitoring or reporting violations. The plant flows ranged from
a daily maximum of 12.68 MGD to a minimum of 1.80 MGD. The average daily flow was 3.39
MGD. The plant treated 1,237,100,000 gallons of wastewater throughout the year, which was
discharged to the Roanoke River.
Roanoke Rapids Sanitary District
2021 Annual Performance Report Page 3

Throughout 2021, there was 2,530,366 gallons of wastewater that was equalized due to
maintenance and later returned to the plant for treatment.
The efforts to repair the collection system and reduce Inflow and Infiltration from prior years
continued in 2021. This work has led to lower peak flows for shorter durations and reduced the
number of bypasses from the plant as illustrated in the following table:
Max Day (MGD) 8.2 9.0 11.4 12.4 12.68
Avg. Daily Flow - MGD 3.34 3.24 3.58 3.39
1.86 1.6
Annual Rain66.3 44.10
Estimated I & I - MGD
- in.
-R- in
fall
1.06
41.33
1.54
60.5
1.48
46
The following table illustrates the treatment performance of the wastewater plant and its ability
to meet and comply with the NPDES permit requirements:
CBOD
85%
96.2%
19.6m: L
3.6m L
30m: L
85%
91.1%
ITIMMITEEM
Fecal
Collform
200
Colonies
400
Colonies
N/A
N/A
42.5
Colonies
>300
Colonies
1
Colon
N/A
N/A
N/A
N/A
MEM
13.4mg/L
<0.5
Total-N
N/A
N/A
N/A
EMI
6.5m: L
Total-P
N/A
N/A
1.1m : L
3.5m; L
0.53m :. L
The wastewater treatment plant, a vital asset in the community, relies heavily on electricity to
operate all its treatment units. The Sanitary District entered a contract with Greggory Poole
Caterpillar for the purchase and Installation of a new full load generator. The new generator was
installed in 2021 and is complimentary to the existing full Toad generator to provide redundant
emergency back-up power while reducing air and noise pollution.
During 2021, the District accepted proposals from biosolids management companies to land
apply the District's residuals. The contract was awarded to Granville Farms, Inc. A total of
1,535.15 applicable acres is permitted. There were 2,759,061 pounds, or 537.25 dry tons of
biosolids applied to 207.18 Acres. There were no permit violations for the land application
program in 2021.
One of the main treatment units at the wastewater plant is the activated sludge basins. This is
where most of the biological treatment occurs. It is also one of the largest energy consumers at
the plant due to the large centrifugal blowers needed to supply air to the process. In 2021, the
District entered a contract with RK&K Engineering to prepare design plans for a new blower
system required to provide air to the secondary treatment basins in a more efficient manner.
Design and permitting are expected to be complete to start construction in 2022-23.
Roanoke Rapids Sanitary District
2021 Annual Performance Report Page 4

A. Permit limit violation
1. G.S.: None
2. WWTP: There were two Notices of Violation in February 2021 for Effluent TSS weekly
average limit and monthly average limit violation and March 2021 for a TSS monthly
average limit violation. The weekly average limit is 45mg/L and monthly average limit is
30mg/L. The violations were 48.16mg/L weekly average and 30.6mg/L monthly average in
February and 31.76mg/L monthly average for March. These violations were attributed to
high flows and wet weather. Specifically, the wet weather led to land application to be
halted and an excess of solids built up in the plant. Once land application resumed, the
solids were regulated at the proper levels and the plant had no trouble meeting compliance.
B. Monitoring and Reporting Violations
1. C.S.: None
2. WWTP: None
C. 2021 Sanitary Sewer Overflows
1. C.S.: There were 3 reportable SSO's in 2021.
1. Manhole 109 at WestRock Paper Mill on 2/12/2021; 1200 Gal.
2. Manhole K419 at Smith Church Rd and Chockoyotte Creek on 6/23/2021; 300 Gal.
3. Manhole 16 at W. Ridgecrest Rd. and W 10th St on 10/14/2021; 975 Gal.
There was an estimated total of 2475 gallons spilled in SSO's in 2021. Spill number 1 was the
result of capacity exceedance due to wet weather conditions, spill number 2 was caused by
rags, and spill number 3 was the result of a broken manhole cover in the pipe due to a faulty
paving operation. This correlates to 1.89 spills per 100 miles of pipe for this reporting year.
2. WWTP: N/A
D. Bypass of Treatment Facility
1. C.S.: N/A
2. WWTP: There were no bypasses at the Wastewater Treatment Plant in 2021.
E. Description of any known environmental impact or violations.
1. C.S.: None
2. WWTP: None
Roanoke Rapids Sanitary District
2021 Annual Performance Report Page 5

F. Description of corrective measures taken to address violations or deficiencies.
1. C.S.: Along with the wildlife control, FOG program, SSES, and outfall clearing discussed
above, RRSD continues to perform preventative sewer backup maintenance by cleaning with
Jetter and Root Cutter, which is attached to the Jetter hose, followed by Closed Circuit TV
(CCTV) camera to inspect the lines after cleaning. The District also uses its Vac -con Truck,
which cleans the line more effectively and proves to be more reliable than the old unit.
District employees completed one Sanitary Sewer Point Repair in 2021. The location was 1300
Julian R Allsbrook Hwy.
District employees completed 25 total new replacement taps in 2021. All 25 were 4" service
lateral replacement taps throughout the district service area.
District employees cleaned 24.37 miles of sewer lines and CCTV'd all suspect problem areas.
District employees utilized the District's excavator mounted flail mower in conjunction with
NC Wildlife Solutions LLC to cut and clear 18.33 miles of interceptor rights -of --way and cross-
country lines in 2021.
The District contracted with Tri-State Utilities at a cost of $177,000 to clean and CCTV a
segment of the Roanoke River interceptor including 925 feet of 21" and 48 feet of 24" clay
pipe. The interceptor, crossing through the Westrock Papermill property, also had 973 ft of
Cured in Place Liner installed by Tri-State Utilities.
The District also installed nine flow meters in select manholes in January of 2021 to monitor
flow levels during weather events. These meters were installed by Hydro -Structures.
RRSD contracted with Tri-State to clean and prepare CCTV report and corresponding video
for the Upper Chockoyotte Creek Interceptor. This section of the interceptor includes
approximately 12,200 linear feet of 12-inch and 15-inch line. Approximately 7,700 linear feet
of line was cleaned and evaluated.
RRSD's consultant, Freese and Nichols, Inc. (FNI), completed its Roanoke River Outfall/Sub-
Basin 'A' sanitary sewer evaluation (SSES) using flow meters and modeling at a total cost of
$116,895.00. The study included a desktop analysis of the existing system, development of
existing sanitary sewer flows, review of previous study information, and hydraulic modeling
of the Roanoke River Outfall (RRO) to evaluate capacity in these areas. After evaluating
alternatives, FNI concluded that the most feasible option was upgrading the Belmont PS to
better handle peak flows from Sub -Basin A and re-routing the force main discharge further
downstream based on available capacity in the sewer collection system. The modeling
evaluation recommended that RRSD continue to monitor the RRO utilizing level only sensor
at key locations to capture manhole levels during wet weather events. RRSD continues to
manage the pumped flows from the WTP backwash to the outfall only under dry weather
conditions.
Roanoke Rapids Sanitary District
2021 Annual Performance Report Page 6

RRSD completed the project design and permitted the replacement of a segment of 8" main
which crosses Chockoyotte Creek in the vicinity of Smith Church Road between Manholes
K419 and K417 at a design cost of approximately $24,700. The segment is known to be a
significant source of inflow due to the deteriorated condition of the pipe. Construction is
anticipated to be completed in 2022.
Budgetary constraints and priority projects prevented RRSD from performing desired
improvements and rehabilitation work in Collection System Sub -Basin 'K'. Sanitary Sewer
Evaluation Survey (SSES) was completed in 2020 to assist RRSD in identifying areas within the
sub -basin where inflow & infiltration (1/1) is occurring. Sub -Basin 'K' contains mostly 8" and
10" gravity collection lines with a 30" main Interceptor (Chockoyotte Creek Outfall) that
serves the basin. The sub -basin contains approximately 435 manholes, and approximately
100,000 feet of gravity pipe.
2. WWTP: All repairs to minimize the inflow & Infiltration due to heavy rains are being made to
correct known system deficiencies.
III. Notification:
This System Annual Performance Report will be noted on the monthly bill and available to
customers via the Roanoke Rapids Sanitary District's Webpage at www.rrsd.org
IV. Certification:
I certify, under penalty of law, that this document is complete and accurate to the best of my
knowledge. I further certify that this report has been made available to the users of the named
system and those users have been notified of its availability.
R. Danieley Brown,
Chief Executive Officer
22i* 22
Da
Roanoke Rapids Sanitary District
2021 Annual Performance Report Page 7

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