WQCS00011_Annual Performance_20200129

ROCKY MOUNT
WATER RESOURCES ' ECE1VED
THE CENTER OF IT ALL
City of Rocky Mount Wastewater Systems JAN 1010
Annual Performance Report NCDEQ/DWR/NPDES
(January 2019 -December 2019)
I. General Information
Facility/System Name: Tar River Regional Wastewater Treatment Facility and Collection
System
Responsible Entity: Brenton F.Bent.MSML, Director of Water Resources
City of Rocky Mount
Persons in Charge: Darrell Highsmith. Wastewater Treatment Plant Chief Operator
Nathaniel Williams, Water&Sewer Services Superintendent
James K Costello. Wastewater Treatment Plant Superintendent
Applicable Permits: NPDES Permit#NC0030317
Land Application Permit #W00005568
Collection System Permit #WQCS00011
Description of Collection System and Treatment Process:
The city of Rocky Mount(City)maintains 436 miles of wastewater collection lines with 33 sewer lift
stations. The collection system receives wastewater from five municipalities located in Nash and
Edgecombe counties. The collection system discharges to the Tar River Regional Wastewater
Treatment Facility. This facility is permitted to treat twenty-one (21) million gallons per day of
wastewaterby a pure oxygen activated sludge process using the Air Products"A20 OASES"biological
nutrient removal process which provides both nitrification (conversion of ammonia to nitrates) and
denitrification (conversion of nitrates to gaseous nitrogen). The effluent is filtered, disinfected and
returned to the Tar River. Waste activated sludge is aerobically digested to permitted parameters and
recycled through land application.
H. Performance Summary for the Reporting Period of January 2019 -December 2019
The Tar River Regional Wastewater Treatment Facility treated 4.33 billion gallons of wastewater in
2019. Removal of CBOD5(Carbonaceous Biochemical Oxygen Demand)contaminants was 98.79%,
total suspended residue was removed at a rate of 98.34%and NH3N(ammonia nitrogen) removal rate
was 98.72%.
The following table serves as an exhibit of the Tar River Regional Wastewater Treatment Facility
performance in relation to set limits within NPDES(National Pollutant Discharge Elimination System)
Permit No.NC0030317 Section A.(l.)a.:

•
TAR RIVER REGIONAL WASTEWATER PLANT '
EFFL UENTANALYSIS
Summer Apr-Oct) Winter(Jan-Mar &Nov-Dec)
Parameter NPDES Limits Actual Values NPDES Limits Actual Values
pH 6to9 6.2to7.3 6to9 6.1to7.4
Residual Chlorine 0.028 mg/L <0.020 mg/L 0.028 mg/L <0.020 mg/L
CBOD5 5 mg/L 1.77 mg/L 10.0 mg/L 2.21 mg/L
Ammonia Nitrogen 2 mg/L 0.112 mg/L 4 mg/L 0.258 mg/L
Total Suspended 30 mg/L 2.16 mg/L 30 mg/L 4.19 mg/L
Residue
Fecal Coliform 200/100 ml 18.2/100 ml 200/100 ml 11.1/100 ml
Dissolved Oxygen 6.0 mg/L minimum 8.25 mg/L 6.0 mg/L minimum 8.72 mg/L
Flow 21 MGD 9.76 MGD 21 MGD 14.8 MGD
Permit Non-Compliance:
The Tar River Regional Wastewater Treatment Facility maintained full compliance for all effluent
limitations and monitoring requirements as written in NPDES Permit No.NC0030317 Section
A.(1.)a. for 2019.
Sanitary Sewer Overflows:
The City's Water Resources Department strives for a goal of zero (0) sanitary sewer overflows
(SSOs). SSOs may result from,but are not limited to,inflow and infiltration due to high water level,
restricted lines from rags, roots,grease accumulations, broken pipes from corrosion and construction
activities and power failures at sewer pump stations. The City is reducing the potential for SSOs by
maintaining back-up generators for pump stations,cleaning system lines and working to reduce
inflow and infiltration problems. Users/Customers of the City's Collection System can help prevent
SSOs by properly disposing of spent household products such as grease/oils and food scraps into
solid waste containers, rather than down the drain.
There were six (6) incidents of sanitary sewer overflow within this report period as follows:
1. 02/23/2019 @1013 Johnson St.
2. 02/23/2019 @ 6503 Old Mill Rd.
3. 02/24/2019 @ 549 E Raleigh St.
4. 02/25/2019 @ E Virginia St& Cowlick Creek.
5. 03/04/2019 @ Riverside Dr&RR Trestle.
6. 11/04/2019 @ Sutton Rd&Arlington St.
With the exception of incident 6, all included sanitary sewer overflows occurred following heavy
sustained rain events; as documented by USGS data.Incident 6 was the result of a blockage caused by
grease and debris build up.

Collection System Improvements:
A Supervisory Control and Data Acquisition(SCADA)system monitors all lift stations through remote
monitoring. The sewer lines are inspected and cleaned daily by a full-time CCTV Crew using high
pressure water jet trucks.
In 2019 the City completed in-house repairs for the following:
• Clean out caps (missing or damaged)replaced: 19
• Manholes raised or repaired: 12
• Service laterals repaired: 33
• Damaged mains repaired: 12
• Mains cleaned:22.3 miles
• Mains video inspected:9.5 miles
• 2,373 linear feet of sewer main relined
M. Notification
This report is available through the City's Water Resources Department webpage, as well as its
publication in the Rocky Mount Telegram.
Certification:
I certify under penalty of law that this report is complete and accurate to the best of my knowledge.I
further certify that this report has been made available to the Users/Customers of the city of Rocky
Mount and that those Users/Customers have been notified of its availability.
6;:FJP.//d ?yy-2 2_ 0
Brenton F. ent MSML •Date
Director of Water Resources
City of Rocky Mount,NC