20_NCS000442_Storm Sewer SOP_20210708

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Municipal Separate Storm Sewer (MS4) Operation and
Maintenance Plan
ROCKYMOUNT
PUBLIC WORKS
THE CENTER OF IT ALL
Goals and Objectives:
To address and reduce potential pollutants that may enter the city's MS4 and provide necessary
maintenance to the city's storm drainage network.
Last Update: June 11, 2021
Program Components:
1. Storm Drain Repair and Maintenance
2. Ditches and Detention Pond Maintenance
3. Catch Basin Cleaning
4. Stormwater System Inspection and Maintenance

1. Storm Drain System Repair and Maintenance
Purpose: To protect stormwater by replacing or repairing components of the storm drain system on a
regular basis to prevent a failure of the storm drain system.
• Stormwater system should be inspected for structural integrity, evidence of illicit discharges, and to
determine areas prone to fast sediment accumulation or confirmed contamination on a routine basis.
+ Practice preventive maintenance for cracks, leaks, and other conditions that could cause
breakdowns in the system.
• Repair defective structures as soon as possible.
Dispose of stockpiled materials appropriately.
• Document inspections, cleanings, and repairs, and maintain records.
• Use appropriate erosion and sediment control practices when performing repairs.
• To the maximum extent practical, ensure that water from jetting and flushing inlets and lines is
not discharged into the storm system. Use a vac truck to vacuum up flush water downstream
while jetting and flushing inlets and lines upstream.
• Report any suspected illegal connections or dumping pursuant to the Illicit Discharge SOP.

2. Ditches and Detention Pond Maintenance
Purpose: To protect stormwater by inspecting and maintaining ditches and ponds on a regular basis to
prevent potential water quality issues.
• Inspect ditches for signs of erosion.
• Track ditches prone to erosion and set maintenance schedule accordingly.
• Do not apply herbicides, pesticides or fertilizers in drainage ditches, roadways, or curbs unless
necessary.
• If herbicides/pesticides are used, they must be applied in accordance with all environmental
regulations, the pesticide label, and under the purview of personnel properly licensed for their use.
• Do not disturb creeks, wetlands, or sensitive wildlife habitat areas without a permit from appropriate
agency.
• Inspect detention ponds regularly to ensure proper functioning annually. Clean and maintain as
needed. Report larger maintenance issues to the Engineering Department.
• Inspect according to city's Illicit Discharge Detection and Elimination Field Screening Plan

3. CATCH BASIN CLEANING
Purpose: To protect stormwater by maintaining the ability of catch basins to trap sediments, organic
matter, and litter. This reduces clogging in the storm drain system as well as the transport of sediments
and pollutants into receiving waterbodies.
• Inspect catch basins for structural integrity and evidence of illicit discharges during cleaning.
Forward any potential illicit discharges to the Engineering Department.
• If there is gross contamination (sewage or oil), stop cleaning and report to supervisor for follow up.
• Test catch basin contamination:
o If obviously (by visual and/or olfactory examination) contaminated with sanitary wastewater,
animal wastes, oil, gasoline, or other petroleum products, test the solids pursuant to the illicit
discharge plan.
• Inspect each catch basin during catch basin cleaning.
• Create a checklist for catch basins to help classify which catch basins require maintenance and how
often.
• Perform street sweeping pursuant to the Street Sweeping SOP to reduce the amount of sediment,
debris, and organic matter entering the catch basins; this in turn reduces the frequency with which
they will need to be cleaned.
• Discharge fluids collected during catch basin cleaning to a sanitary sewer or buffered detention area.

4. Stormwater System Inspection and Maintenance
Purpose: To protect stormwater by inspecting and maintaining the stormwater system on a regular basis
to prevent potential water quality issues.
• Stormwater system should be inspected for structural integrity, evidence of illicit discharges, and
to determine areas prone to fast sediment accumulation or confirmed contamination on a routine
basis.
• Stormwater system (including inlets, catch basins, lines, manholes, ditches, outfalls, detention
ponds, and permanent SCM's) should be cleaned and maintained as needed or reported.
• Report any areas needing attention and schedule repairs ASAP.
• Keep records of inspected areas.
• Ensure that water from jetting and flushing inlets and lines is not discharged into the storm
system to the maximum extent practical. Use a vac truck to vacuum up flush water downstream
while jetting and flushing inlets and lines upstream.
• Report any suspected illegal connections or dumping pursuant to the Illicit Discharge SOP.
Decanting Wastewater from Vac Trucks
• Always decant wastewater from vac trucks into the sanitary sewer or buffered detention area.
Debris Disposal and Storage
• Store debris from cleaning storm drains in an area that has an impervious surface or liner or in a
temporary storage area or container. The debris storage area is located at: 3031 Treatment Plant
Rd. Rocky Mount, NC 27801
• Always inspect and maintain the debris storage area. Check area for run-on or runoff or debris
scattering.
• Debris should be removed and taken to the permanent disposal site regularly.
• When the buffered detention area reaches 75% capacity it will be removed for disposal.
• The permanent disposal site is at: 3873 Old Battleboro Rd. Rocky Mount, NC 27801.
If debris is suspected to be contaminated, it should be tested to determine the proper disposal
method. Debris disposed of at the permanent disposal site will be in a solid state.
Contracts and Contractors
• Contracts should include stormwater pollution prevention language.
• Ensure that contractors implement proper SCM's to prevent stormwater pollution.
Employee Training
All applicable employees should be trained in stormwater pollution prevention, including how to
recognize and report illegal connections or discharges.