WQCS00027_NOV-2020-DV-0310 Response_20200810

P.O. Box 308
OKt RqA 1000Jackson Street
�4 Roanoke Rapids, NC 27870
Roanoke Rapids SanitaryDistrict 537-9137 7 � Fax: [phone]G4
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August 10, 2020
CERTIFIED MAIL: 7005 3110 0001 6339 2135
RETURNED RECEIPT REQUESTED
Mr. Scott Vinson, Regional Supervisor NC Dept of Environmental Quality
Water Quality Regional Operations Section
Raleigh Regional Office AUG 14 2020
1628 Mail Service Center
Raleigh, NC 27699-1628 Raleigh Regional Office
Re: Notice of Violation - Tracking Number: NOV-2020-DV-0310
Collection System Permit Number: WQCS00027
Roanoke Rapids Sanitary District (RRSD)
Halifax County
Dear Mr. Vinson,
Please be advised that ongoing remedial action is being taken to correct the violations in the
collection system resulting in the referenced NOV received duly 22, 2020. Please note each
incident as reported in BIMS.
Incident 202001958 located at W. PL Street & Starke Drive is in a receiving segment
downstream of the Belmont Pump Station system in Sub -Basin `A'. Roanoke Rapids Sanitary
District (RRSD) recently discussed extenuating factors leading to spills at this location in its
response to NOV-32020-DIV-0197 and others; which are predicated on rainfall intensity,
duration and ground water levels associated with wet weather conditions. RRSD is currently in
the process of engaging its consultant to further evaluate conditions leading to Sub -Basin `A'
SSOs followed by corrective measures necessary to minimize and eliminate corresponding spills.
(See proposal attached.)
Incident 202001963 located at Gail Court occurred when a power surge during a thunderstorm
knocked out the Variable Frequency Drives used to convert single phase to 3-phase utility power
required to start the pumps at the Greenbrier Pump Station. Concurrent with the power surge the
SCADA at the pump station intermittently reported alarm conditions monitored at the operator
station; which was acknowledged and responded to. RRSD replaced the telemetry antenna and is
in the process of adding an UPS at the pump station.
SSO.NOV.Responsc062220 Page 1 of

We trust our actions are deemed adequate and prudent and will result in a favorable penalty
assessment in order that more local funds may be committed to a mutually satisfactory resolution
in this process. Roanoke Rapids Sanitary District gratefully appreciates your time and
consideration in this matter. Should you require additional information, please do not hesitate to
contact us.
Very Truly Yours,
Roanoke Rapids Sanitary District
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Brow P.C.
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cc: Gregory Browning, Chairman, Letter Only
David Scott, 1' / Enclosures
Gregg Wilson, Letter Only
File

Draft Scope of Services
Wastewater Sub -Basin 'A'
and
Roanoke River Outfall Study — Phase I
Roanoke Rapids Sanitary District
July 31, 2020
PROJECT UNDERSTANDING:
The Roanoke Rapids Sanitary District (RRSD) owns and operates sanitary wastewater collection system
facilities that serve the City of Roanoke Rapids, the Town of Gaston, parts of Halifax County and some
other surrounding areas. The collection system consists of over 145 miles of sewer pipe ranging in size
from 8" to 30", six lift stations, and one WWTP. The system is divided into 16 sanitary sewer collection
sub -basins. Some of the system has been in place since before 1930.
RRSD has performed previous study and SSES work in Sub -Basin A. The results of the previous study
indicated some level of 1/1 in this area, and RRSD has addressed the 1/1 through collection system rehab
and repairs in the sub -basin. However, RRSD is still experiencing high volumes of flow during wet
weather events at the Belmont PS which serves Sub -Basin A. The Belmont PS is a duplex, suction lift
pump station and both pumps are required during rain events. Frequently during weather events when
both pumps operate RRSD has indicated downstream sewer capacity issues, and when both pumps do
not operate in wet weather events the upstream sewer is surcharged and exceeds capacity.
In addition to the capacity issues noted in Sub -Basin A, RRSD has also experienced wet weather capacity
issues in the Roanoke River Outfall which is located downstream of Sub -Basin A and which flows to the
WWTP through a combination of 21" and 30" gravity sewers. The section of the 21" outfall that serves
the paper mill has been known to demonstrate some capacity restraints and posed some backups in the
lateral that serves the paper mill.
As such, RRSD would like to further evaluate the system capacity that serves Sub -Basin A and the
capacity in the Roanoke River Outfall.
BASIC SERVICES:
Based on discussions with the RRSD staff, FNI proposes to provide a phased approach to the collection
system evaluation for Sub -Basin A and the outfall. The first phase includes a desktop analysis of the
existing system, development of existing sanitary sewer flows, review of previous study information, and
hydraulic modeling to evaluate capacity in these areas. Additional phases to follow Phase I may include
flow monitoring, additional modeling, or field inspection work dependent upon results of the Phase I
study. A detailed scope of work is provided below for Phase I:
PHASE I — Desktop Capacity- Analysis and Modeling
A. Data Collection and Review
1. Proiect Kick -Off Meeting: FNI will conduct an initial meeting with RRSD to review proposed scope
of services, study approach, goals, and deliverables of the study. FNI will provide the RRSD with
a Data Request Memorandum identifying specific data needs.

2. Data Collection: FNI will compile information from RRSD for the wastewater systems including
but not limited to existing studies for the sub -basin, record drawings, mapping, GIS data,
maintenance records, and other documentation pertinent to the study.
B. Desktop Analysis
1. Pump Station Capacity: FNI will review existing study information for Sub -Basin A and the
Belmont PS. FNI will also review existing record drawings for the Belmont PS and provide an
assessment of the existing PS available storage and cycle times according to the wet well volume,
and PS design capacity.
2. Roanoke River Outfall: FNI will review existing GIS information and record drawings for the
existing Roanoke River Outfall. FNI will also review previous outfall studies and previous flow
monitoring data, as available, for the outfall pipeline.
C. Existing Sanitary Sewer Flaws
1. GIS: Existing GIS data, as available from RRSD, will be used to evaluate existing land use and zoning
for the Sub -Basin A service area as well as other sub -basin areas that drain to the Roanoke River
Outfall.
2. Water Billing Data: FNI will review water meter billing data provided by RRSD and compare water
billing data with previous flow monitoring data to quantify the existing dry weather flows within
the Sub -Basin A area and other sub -basins that drain to the Roanoke River Outfall.
3. WWTP Influent Flow: FNI will also review historical influent flows at the Roanoke River WWTP to
evaluate existing peak wet weather flows compared to existing dry weather flows and determine
an overall system peaking factor.
D. Hydraulic Modeling
1. FNI will build a sewer model of the existing Roanoke River Outfall. The model will be based on
available GIS and record drawing information and will include pipe sizes, pipe and MH invert
elevation data, and MH rim information. The model will include the outfall from the discharge
location of the Highway 48 force main from Gaston and extend to the Roanoke River WWTP.
2. The sewer model will include dry weather wastewater loading at key points along the outfall
based on the existing flows developed in Task C.
3. Model scenarios will evaluate the existing dry weather flows in the Roanoke River Outfall to
assess the current pipe capacity compared with existing dry weather flow.
4. A peak wet weather model scenario will be evaluated using estimated peaking factors for each
sub basin based on available data or using a system -wide peaking factor based on historical
influent flow information from the WWTP.

E. Technical Memorandum Report
Prepare Draft Technical Memorandum (TM) Report: FNI will prepare a Draft TM Report
documenting the all the findings from the desktop analysis and modeling completed in Phase I of
the Sub -Basin A and Roanoke River Outfall study. The Draft TM Report will include a description
of the data review, graphical results of desktop study and modeling, and recommendations with
respect additional field investigations or follow up work to further investigate capacity restraints
in Sub -Basin A and the Belmont PS and within the Roanoke River Outfall. An electronic PDF version
of the report will be submitted for review.
2. Revise and Finalize Alternatives Analysis Report: FNI will revise the report based on RRSD
comments and submit five (5) final hard copies and one electronic copy in PDF format of the Final
Capacity Study Report.
TIME OF COMPLETION:
FNI is authorized to commence work on the Project upon execution of this Agreement and agrees to
complete the services in accordance with the following schedule:
• Complete Phase I - within xx days from Notice to Proceed
• Phase H- to be determined based on results of Phase I study
COMPENSATION:
The total fee for Basic Services for Phase I shall be the lump sum fee of $xx,000.00. The fee includes all
costs associated with labor and reimbursable direct expenses.
Additional Items
1. As needed