WQCS00011_Response to NOV-2020-DV-0243_20200604

SM
ROCKY MOUNT
WATER RESOURCES
THE CENTER OF IT ALL
June 4, 2020
Brenton Bent
Director of Water Resources
City of Rocky Mount
331 South Franklin Street
Rocky Mount,NC 27804
Scott Vinson, Regional Supervisor
Water Quality Regional Operations Section
Raleigh Regional Office
13800 Barrett Drive,
Raleigh,NC 27609
Subject: Notice of Violation& Intent to Issue Civil Penalty
Tracking No.-NOV 2020-DV-0243
Collection System Permit No. WQCS00011
Dear Mr. Vinson,
I received the Notice of Violation from the DWR dated May 19, 2020 regarding the sanitary
sewer overflow (SSO) event that occurred on April 30, 2020. The city of Rocky Mount takes
these incidents very seriously and continues to take steps to minimize the potential for such
overflows within our sewer collection system.
The River Side Drive location is one of the lower points in the city's collection system and has
proven problematic in the past, during high intensity rain events. It is for this reason that the city
has embarked on several capital projects with specific focus on increasing flow capacity at this
location and to reduce inflow/infiltration across our entire sewer collection system in general.
The actions detailed below reinforces the city's desire and total commitment towards resolving
sanitary sewer overflows in a concerted and expeditious manner.
0 January 27, 2020- Purchase order was issued to AMLINER East in the amount of
$2,358,958.70 to rehabilitate approximately 9,480 linear feet of the 27-inch Beech Branch
sewer outfall from the Wastewater Treatment Plant to Seven Bridges Road. The existing
coal tar epoxy corrugated metal gravity line has been a source of significant
inflow/infiltration which reduces system capacity. The line will be rehabilitated using the
cured in place method. Additional work includes rehabilitation or replacement of existing
[phone] / 331 S.Franklin Si.,PO Box 1180,Rocky Mount,NC 27802-1180 1 www.rockymountnc.gov

manholes. This outfall serves residential and industrial customers in the northern end of
the city and accounts for approximately 30% of the flows to the Wastewater Treatment
Plant. The relining of the pipe is currently in progress and is anticipated to be substantially
completed in March 2021. It should also be noted that the city has allocated an additional
$2,000,000 in fiscal year 2022 to address the second phase of this project which will
include the remaining section of the line from Seven Bridges Road to Highway 301.
• October 30, 2019-Purchase Order was issued to Step Construction Inc. in the amount of
$624,000 for the replacement of two screw pumps at the Highway 97 Lift Station. This
lift station is downstream of Riverside Drive and receives approximately 65% of the
flows to the Wastewater Treatment Plant. The pumps to be replaced were operating at a
reduced pumping capacity of 2-3 million gallons per day. The new pumps are each rated
at 10 million gallons per day and it is anticipated that this will significantly reduce
incidents of sanitary sewer overflows at the River Side Drive location. The project is
currently in progress and is anticipated to be substantially completed in September 2020.
• March 20, 2019- Frazier Engineering completed a flow monitoring report that
investigated four(4) sites in the city's wastewater collection system. The purpose of the
flow monitoring was to determine the average daily flow, diurnal peaking factors and wet
weather responses within the Old Mill Road Pump Station Basin. This basin is upstream
of Riverside Drive. City engineering staff continues to evaluate the report with the
intention of addressing the noted infiltration concerns along the downstream portion of
the Basin. The system geometry is also being evaluated for hydraulic improvement
opportunities.
• April 29, 2019- The Wooten Company (TWC) completed a pump runtime analysis on 32
pump stations in the sewer system. The goal of the analysis was to provide a preliminary
evaluation of the pump stations to determine issues based on pump runtimes and to
determine how close pump stations are to reaching design capacity. As a result of this
exercise, the city identified four (4) priority pump stations requiring rehabilitation work
to improve pumping capacity. These stations are listed in the FY 21-25 Capital
Improvement Plan (C1P) as follows:
Pump Station Location Fiscal Year Cost allocated $
3olu-ison Street 2021 1,000,000
Old Mill Road 2022 1,500,000
Sharpsburg 2023 1,000,000
Arbor Lane 2023 1,000,000
[phone] / 331 S.Franklin St.,M Rex 1180,Rocky Mount,NC 27802-1180 /www.rockymountnc.gov2

Please be assured that the city of Rocky Mount is working with great care and perseverance to
reduce the number of sanitary sewer overflows in the collection system and this effort will
remain a top priority into the foreseeable future. As you can see, we are taking the necessary
steps to address the integrity of our entire collection system and our hope is that the Division of
Water Resources will favorably consider these efforts as you deliberate on any further actions
regarding these incidents.
If you have any questions, or require any additional information regarding our efforts,please do
not hesitate to contact me at 252-972-1299 or email at [e-mail]
Sincerely,
a/
Brenton Bent, Director of Water Resources
[phone] 331 "P Rox 1180,Rocky Mount,NC27802-1118O /www.rockymountnc.p3