NCS000500_Ayden 2010 Draft SWMP_20190725

July 2010 - DRAFT

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TABLE OF CONTENTS

INTRODUCTION..................................................................................................................2

1. Storm Sewer System Information.........................................................................3

1.1 Population Served....................................................................................3
1.2 Growth Rate.............................................................................................3
1.3 Jurisdictional Area....................................................................................3
1.4 MS4 Conveyance System........................................................................3
1.5 Land Use Composition.............................................................................4
1.6 TMDL Identification...................................................................................4

2. Receiving Streams................................................................................................5

3. Existing W ater Quality Programs..........................................................................6
3.1 Local Programs.........................................................................................6
3.2 State Programs.........................................................................................6

4. Permitting Information...........................................................................................7
4.1 Responsible Party Contact List.................................................................7
4.2 Organizational Chart.................................................................................7
4.3 Signing Official..........................................................................................8
4.4 Duly Authorized Representative...............................................................8

5. Co-Permit Status Information................................................................................9

6. Reliance on Another Entity..................................................................................10
6.1 Name of Entity.........................................................................................10
6.2 Elements Implemented ...........................................................................10
6.3 Contact Information..................................................................................10
6.4 Legal Agreement .....................................................................................10

7. Stormwater Management Program Plan...............................................................11
7.1 Public Education and Outreach.....................................................................11
7.2 Public Involvement and Participation.............................................................12
7.3 Illicit Discharge Detection and Elimination.....................................................13
7.4 Construction-Site Stormwater Runoff Control................................................14
7.5 Post-Construction Stormwater Management.................................................15
7.6 Pollution Prevention/Good Housekeeping for Municipal Operations.............17

ANNUAL REPORTING.........................................................................................................19

LIST OF APPENDICES .....................................................................................................20
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INTRODUCTION

Why Is Stormwater Important?
North Carolina’s number one water quality problem is stormwater runoff pollution. As
stormwater flows across impervious surfaces, it picks up various pollutants, such as oil &
grease, excess nutrients, bacteria and sediment. Polluted stormwater flows down our storm
drains and ditches where it is discharged, untreated, into our streams, rivers, and lakes.
Stormwater runoff pollution causes adverse impacts to aquatic ecosystems, poses human
health risks, and can greatly increase the cost of treating our drinking water.

Program Background
In 1972, the National Pollutant Discharge Elimination System (NPDES) program was
established under the authority of the Federal Clean W ater Act. Phase I of the NPDES
Stormwater program was established in 1990. It required NPDES permit coverage for
municipalities with populations of 100,000 or more.

Phase II of the NPDES Stormwater program was signed into law in December 1999. The Phase
II program extended permit coverage to smaller (< 100,000 pop.) c ommunities and public
entities that own or operate a municipal separate storm sewer system (MS4). It required these
smaller communities to develop a stormwater program and obtain an NPDES permit for
stormwater discharges.

In North Carolina, the Department of Environment and Natural Resources, Division of W ater
Quality (NCDWQ) administers the NPDES Stormwater program. NCDWQ issued the Town of
Ayden’s (Town) initial Phase II permit, on December 1, 2005. The permit required the Town to
develop, implement, and enforce a stormwater program designed to reduce the discharge of
pollutants from the MS4 to the maximum extent practicable. The program was implemented in
phases over the last five years. Pursuant to the permit the stormwater program included the
following six minimum measures or best management practices (BMPs):

1. Public education and outreach;

2. Public involvement/participation;

3. Illicit discharge detection and elimination;

4. Construction site stormwater runoff controls;

5. Post-construction site runoff controls for new development and redevelopment;

6. Pollution prevention and good housekeeping for municipal operations.

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1. Storm Sewer System Information

1.1 Population Served
Estimated population served........................4,9431

1.2 Growth Rate
Estimated growth rate..................................7.5%2

1.3 Jurisdictional Area
Town Limits..................................................3.27 sq. mi
ETJ Only....................................................14.63 sq. mi.
Total Planning Jurisdiction………………...17.90 sq. mi.

1.4 MS4 Conveyance System
Much of the Town’s stormwater conveyance system is in excess of 50 years old,thusit
consists of a variety of materials and components. These range from typical curb and
gutter systems conveyed by concrete, terra cotta, ductile iron and corrugated galvanized
pipes to simple sheet flow. The predominate conveyance components include grass
lined swales and vegetated drainage ditches with various pipes and culverts. There are
also very few detention facilities within the Town’s jurisdiction; with all of these being
located on private property.
Stormwater conveyance system components are periodically inspected to ensure proper
function. Additionally, visual inspections are performed during significant rain events.
The North Carolina Department of Transportation (NCDOT) maintains systems within
their public road rights-of-way. Systems located on private property, including detention
facilities and other structural and nonstructural BMP’s, are maintained by the owner.
The Town, as part of its stormwater program, performs mechanical street sweeping and
leaf/debris removal on a weekly basis on all streets within its jurisdiction. Additionally,
stormwater piping is mechanically cleaned by means of a high pressure water jet
vacuum assisted truck. After cleaning, the stormwater piping is videoed with a crawling
camera which transmits video to DVD. This work assists in identifying possible pipe
failures/fractures.

July 2008 Town Population Estimate Data from North Carolina Office of Budget and Management,
http://www.osbm.state.nc.us/.
Percentage increase from 2000 to 2008 (source North Carolina Office of Budget and Management).
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1.5 Land Use Composition
Estimated Land Use3
Residential....................................................12%
Commercial....................................................5%
Industrial.........................................................2%
Open Space.................................................81%
Total.............................................................100%

1.6 TMDL Identification
Currently, no streams within the Town of Ayden’s jurisdiction have an associated Total
Maximum Daily Load.

Land use percentages were estimated from the Town of Ayden Existing Land Use GIS Layer. Area of parcels for
each designated land use type were summed and calculated for relative percentage of the planning jurisdictional area
(Town Limits and ETJ).
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2. Receiving Streams
The Town of Ayden lies within the Swift Creek and Contentnea Creek Watersheds and is
located entirely within the Neuse River Basin. Specific receiving waters are listed below and
are depicted on Map1.

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3. Existing Water Quality Programs

3.1 Local Programs
The following programs and ordinances are being implemented within the Town’s
jurisdiction.

Town of Ayden Zoning Ordinance – regulates overall development and land use.
Specific water quality aspects of the Zoning Ordinance include maximum lot coverage
standards, landscaping and buffering requirements, and the Conservation Zoning District
which has been applied to all of the jurisdiction’s Regulatory Floodplain.

Town of Ayden Subdivision Ordinance – regulates the subdivision of property and
includes the specifications for new streets (including their stormwater conveyance
design).

Pitt County Flood Damage Prevention Ordinance – protects water quality by preventing
new development within flood hazard zones. This Ordinance is administered by Pitt
County via an Inter-Local Agreement.

Pitt County Soil Erosion and Sedimentation Control Ordinance – protects water quality
by providing measures to ensure construction site stormwater runoff control. This
Ordinance is administered by Pitt County via an Inter-Local Agreement.

Town of Ayden Comprehensive Plan – The Town of Ayden is currently developing a new
Comprehensive Plan that will guide how the Town grows and operates over the next
twenty years. One Chapter proposed for this Plan will address the general issue of
Environmental Quality and will have specific Goals and Objectives related to stormwater
and water quality.

3.2 State Programs
Development within the Town’s jurisdiction is subject to the Neuse River Basin Rules
which are implemented by Pitt County through the administration of their Soil Erosion
and Sedimentation Control Ordinance. The Town of Ayden does rely on NCDOT to
maintain stormwater facilities and programs within their road rights-of-way.

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4. Permitting Information
The Town’s Stormwater Program is a component of the Department of Public Works and
Utilities. The Public W orks and Utilities Director oversees the program and works closely with
the Town Manager, Assistant Town Manager, and Pitt County Department of Planning staff.

4.1 Responsible Party Contact List
Overall implementation and oversight of the Town’s Stormwater Program is provided
through the Town’s Public Works Department. The Contact person is:

Robert Sutton
Public W orks and Utilities Director
Town of Ayden
P.O. Box 219
Ayden, NC 28513
Telephone: [phone]
Email: [e-mail]

4.2 Organizational Chart
The Town’s organization chart is provided below.

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4.3 Signing Official
The Town of Ayden operates under a council-manager form of government. The town
manager is responsible for management and oversight of the Town’s daily operations.
Contact information is listed below:

Adam G. Mitchell
Town Manager
Town of Ayden
P.O. Box 219
Ayden, NC 28513
Telephone: [phone]
Email: [e-mail]

4.4 Duly Autho rized Representative
Not applicable.

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5. Co-Permit Status Information
The Town is not co-permitting with another entity.

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6. Reliance on Another Entity
The Town of Ayden utilizes Pitt County to implement portions of its Stormwater Program as
follows:

6.1 Name of Entity
Pitt County

6.2 Elements Implemented

A. Administration of the Pitt County Flood Damage Prevention Ordinance within the
town’s planning jurisdiction. Authority to do so is provided by Inter-Local
Agreement.

B. Administration of the Pitt County Soil Erosion and Sedimentation Control
Ordinance within the town’s planning jurisdiction. The administration and
implementation of this Ordinance is also the mechanism by which the Neuse River
Basin Stormwater Rules are implemented. Authority to do so is provided by Inter-
Local Agreement.

6.3 Contact Information

Jonas Hill
Pitt County Planning Department
1717 W. 5th Street
Greenville, NC 2
Telephone: [phone]
Email: [e-mail]

6.4 Legal Ag reement
The Town entered into an inter-local agreement with Pitt County, effective December 8,
2003, to administer the County’s Flood Damage Prevention Ordinance within the town’s
planning jurisdiction. A copy of the Agreement is attached.

The Town entered into an inter-local agreement with Pitt County, effective December 8,
2003, to administer the County’s Soil Erosion and Sedimentation Control Ordinance
within the town’s planning jurisdiction. A copy of the Agreement is attached.

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7. Stormwater Management Program Plan
The following sections describe the Town’s Stormwater Management Program and
measurable goals for each BMP. While the six BMPs are not expected to change over the life
of this Stormwater Management Plan, measurable goals may be modified, removed, or new
goals added. Changes may be necessary to meet permit renewal requirements, changes in
resources, or to be more effective in reducing impacts to the MS4. Modifications to these
goals will be documented within the required annual report.

7.1 Public Education and Outreach
The Town’s stormwater public education and outreach program includes dissemination
of educational materials at festivals and special events, the development and distribution
of a stormwater newsletter to all town utility customers, and the provision of a
Stormwater Management Program Page on the Town’s W ebsite.
Target Pollutant Sources
Land use within the Town’s jurisdiction is composed primarily of residential, commercial,
and agricultural uses. Target pollutant sources from these land uses include:

Sediment – Sediment can adversely impact waterways and aquatic environments. Due
to recent drought cycles, maintaining vegetative cover has been an issue. For new
construction, erosion control is necessary to keep sediment on site.

Litter/Yard Waste – Litter and yard waste can block stormwater conveyances. As litter
and yard waste decompose it introduces chemicals and additional nutrients into the
storm system.

General Household and Landscape Chemicals – These include fertilizers, pesticides,
automotive chemicals, and detergents and can cause significant impacts to aquatic
environments.

Target Audience
Two primary target audiences have been identified, local citizens and business owners.
Local citizens will be targeted via their residences, churches, schools, and other civic
groups. Business owners, particularly developments with high impervious surface ratios,
will be targeted.

Measurable Goals
.
A. Develop and Distribute Materials
Develop educational materials or modify/utilize existing materials available
from other agencies. Distribute educational materials through educational
programs, local events (such as Downtown Day and the Ayden Collard
Festival) and placement of informational flyers at Town Hall (4144 West
Avenue) and the Town Operations Center (4061 East Avenue).

B. Stormwater Related Newsletter
Publish a Town Newsletter related the Town’s Stormwater Management
Program and general water quality issues quarterly. The Newsletters will be
distributed to all town utility customers (water, sanitary sewer, and/or electric)
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via monthly utility bills and a digital catalog of the Newsletters will be available
on the Stormwater Management Program Page of the Town’s Website.

C. Stormwater Page on the Town’s Website
The Town will maintain a Stormwater Management Program Section on the
Town Website where appropriate educations materials and information will be
made available to the public.

D. Additional Educational Programs
The Town will provide stormwater and water quality related educational
programs to scouts groups, homeowner associations, and other civic groups
as requested. The Town will also provide educational information to local
business, and evaluate the feasibility of conducting workshops for local
business targeting illicit discharge and good housekeeping practices.

Evaluation
The Town’s Public Education and Outreach program will be evaluated by assessing
progress towards each measurable goal listed above. Information and data towards
completion of each measurable goal will be tracked. Progress will be reported each year
in the annual report to the state.

7.2 Public Involvement and Participation
The Town’s Stormwater Public Involvement and Participation Program includes
maintaining an informational website with contact information; participation in local
events and festivals; annual input from the Governing Board, Planning Board and
citizens;, and a Volunteer Storm Drain Stenciling Program.

Measurable Goals
.
A. Stormwater Page on the Town’s Website
The Town will maintain a Stormwater Management Program Section on the
Town W ebsite where contact information for citizens to report concerns or
make requests. Respond to citizen request as warranted.

B. Annual Review and Input
The Town of Ayden Stormwater Management Plan will be reviewed annually
by the Town Planning Board and Governing Body. Each body will provide an
opportunity for public comment related to the Plan.

C. Outreach Events/Festivals
The Town will distribute information related to the Town’s Stormwater
Management Program at various events and festivals such as Downtown Day
and the Ayden Collard Festival.

D. Volunteer Program
The Town will initiate and oversee a Volunteer Storm Drain Stenciling
Program. The Program will consists of stenciling a message next to street
storm drains reminding people "Dump No W aste- Drains to Neuse River" with
the image of a f ish.
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Evaluation
The Town’s Public Involvement and Participation Program will be evaluated by
assessing progress towards each measurable goal listed above. Information and data
towards completion of each measurable goal will be tracked. Progress will be reported
each year in the annual report to the state.

7.3 Illicit Discharge Detection and Elimination

The Town’s Stormwater Illicit Discharge Detection and Elimination program is outlined
below and includes Storm Sewer System Mapping; the regulatory mechanism used to
prohibit illicit discharges into the MS4; enforcement; and detection and elimination.

Measurable Goals

A. Storm Sewer System Map
The Town of Ayden maintains a Geographic Information System (GIS)
database that includes detailed geospatial information related to the Town’s
storm sewer conveyance system. The database also includes geospatial
information related to drainage areas, receiving streams, land use, zoning,
floodplain data, and other pertinent data. This information is updated
periodically.

Pursuant to the Town of Ayden’s current permit, components of their MS4
were mapped using Global Positioning System (GPS) technology and are
included in the GIS. The Town will update the GIS Stormwater Layer to
ref lect changes to the MS4 as necessary. This may include updating
stormwater system components for new development, repairs, and
maintenance, in addition to updating stream data based on surface water
identification requests. Mapping updates of the MS4 is solely the Town’s
responsibility.

B. Regulatory Mechanism
Article VII of the Town’s Phase II Stormwater Ordinance provides the
regulatory mechanism for addressing illicit discharges and connections to the
Town’s MS4 System. The Town will continue to maintain this regulatory
mechanism for the duration of this Plan.

C. Procedures for Illicit Discharge Detection and Elimination
In an effort to identify and eliminate illicit discharges into the MS4, the Town
will investigate citizen complaints; identify at least one new priority area for
detection and elimination annually; and conduct dry weather inspections in
priority area(s).

D. Staff Training
The Town will provide appropriate employees with information related to the
hazards associated with illegal discharges and improper disposal of waste.
The Town will further explore the feasibility of partnering with other regional
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Phase II Communities to conduct at least one training session for Town
employees related to this topic.

E. Public Outreach
The Town will provide area businesses and the general public with
information related to the hazards associated with illegal discharges and
improper disposal of waste. This information will be distributed as part of the
Public Education and Outreach Program component of this Plan via the
previously described Stormwater Related Newsletter and Stormwater Page
on the Town’s Website.

F. Local Stream Monitoring
Evaluate the need for additional stream sampling/monitoring. Identify possible
partnerships for collaborative sampling/monitoring efforts.

Evaluation
The Town’s Public Illicit Discharge Detection and Elimination Program will be evaluated
by assessing progress towards each measurable goal listed above. Generally,
inspection and complaint information will be logged and tracked. Assessments will be
made toward completion of the goals listed above. Progress will be reported each year
in the annual report to the state.

7.4 Construction-Site Stormwater Runoff Control
Pitt County implements and enforces construction site stormwater runoff control for the
Town of Ayden through its Soil Erosion and Sedimentation Control Program. Pitt County
has local delegated authority from the state to implement such a Program.

Measurable Goals

A. Regulatory Mechanism
Pitt County administers the Pitt County Soil Erosion and Sedimentation
Control Ordinance within the town’s planning jurisdiction. Authority to do so
is provided by Inter-Local Agreement.

B. Plan Review
Pitt County reviews and approves Soil Erosion and Sedimentation Control
Plans for proposed new development projects within the Town’s jurisdictionto
ensure compliance with the Pitt County Soil Erosion and Sedimentation
Control Ordinance.

C. Inspections
Pitt County inspects permitted construction sites within the Town’s jurisdiction
to ensure compliance with approved Soil Erosion and Sedimentation Control
Plans. As needed, they request corrective actions, issue Notice of Violations
and Stop W ork Orders as outlined in the Ordinance.

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Evaluation
Pitt County maintains a database and inspection reports on each permitted construction
site. Information regarding number of sites, acreage of disturbance, compliance, notice
of violations, and enforcement actions are tracked and will be included in the annual
report to the state for sites within the Town’s jurisdiction.
7.5 Post-Construction Stormwater Management in New Development and
Redevelopment
The Town’s Post-Construction Stormwater Program includes four primary components:
new development review, stormwater BMP inspection, education and outreach, and
retro-fit opportunities. The Town is responsible for the implementation and enforcement
of its Phase II Stormwater Ordinance.

Regulatory Mechanism
On September 8, 2008, the Town of Ayden Governing Board adopted the Town of
Ayden Phase II Stormwater Ordinance which provides the regulatory mechanism for
post-construction stormwater controls in the town’s jurisdiction.

Post-Construction Stormwater Requirements
The Town of Ayden utilizes both structural and non-structural BMPs to treat and control
post-construction stormwater. Non-structural BMPs include stream buffers, flood hazard
zone protection, and landscaping requirements.

Structural stormwater BMPs include those listed in the NCDWQ Stormwater BMP
Manual. Through its Phase II Stormwater Ordinance, the Town requires structural BMPs
to have a signed operations and maintenance agreement and certification by a licensed
engineer that the BMPs have been properly constructed. These measures are in place
to ensure proper operation of the BMP.

Specific post-construction stormwater requirements for new development are outlined
below.

For projects that individually, or cumulatively, disturb more than one-acre there are two
options; low-density and high-density.

A project is a low-density project if it has no more than two dwelling units per acre for
residential development and no more than twenty-four (24) percent built-upon area
(BUA) for non-residential development.
Low-density development requirements include:
Use vegetative conveyances;
Minimum stream buffers (30-feet);
Reduce nutrient loading (i.e. Meet Neuse River Basin Rules);
Must have an operation and maintenance agreement and restrictive
covenants for structural BMPs.

A project is a high-density project if it exceeds the low-density threshold for dwelling
units per acre and/or built-upon area.

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High-density development requirements include:
85% total suspended solids reduction;
Control/treat the first 1-inch of rainfall;
Discharge the storage volume at a rate equal to or less than the
predevelopment discharge rate for the one (1) year, twenty-four (24) hour
storm;
Drawdown between 48 and 120 hours;
Reduce nutrient loading (i.e. Meet Neuse River Basin Rules);
Must have an operation and maintenance agreement and restrictive
covenants for structural BMPs.;
Minimum stream buffers (30-feet).

Other Related Policies, Practices, Regulations
In addition to the specific post-construction stormwater requirements listed above, the
Town of Ayden employs other policies, practices and regulations that help to protect the
water quality of its receiving waters. Measures are currently in place that help to protect
natural resources, protect open space, preserve trees, regulate redevelopment and
street design. During the Comprehensive Plan development process, the Town is
evaluating additional measures to minimize water quality impacts associated with future
development activities.

Measurable Goals
A. New Development Review
Review and approve proposed new development projects to ensure
compliance with the Town’s Phase II Stormwater Ordinance requirements.

B. BMP Inspections
Inspect new structural stormwater BMPs at the time the project is complete
to ensure compliance with approved plans. Map new BMPs using GPS/GIS
technology. Review required annual inspection reports submitted by the
BMP owner. Conduct follow-up inspections as warranted and provide
inspection reports to owner outlining follow up actions. Issue notice of
violations if warranted.

C. Education/Outreach
This portion of the Post-Construction Stormwater Management Program is
part of the overall education/outreach component described in Sections 7.1
and 7.2 herein. This primarily includes providing information to businesses,
homeowner associations and other stormwater BMP owners about
maintenance and inspection requirements.

D. Retro-fit Opportunities
Identify at least one new possible stormwater retro-fit location annually.
Evaluate sites already identified based on land availability, willing
ownership, potential for pollution reductions, and other pertinent variables.
Rank these sites and evaluate grant availability and/or other funding
sources to implement retro-fits. Identify potential partnerships to develop
and fund retro-fit projects.

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Evaluation
Electronic records of each BMP site approved through the Town’s Phase II Stormwater
Ordinance, including inspection records, shall be maintained by the Town. Information
regarding the number of plans reviewed, BMP inspections and other pertinent
information will be included in the annual report to the state for development within the
Town’s jurisdiction.

7.6 Pollution Prevention / Good Houskeeping for Municipal Operations
The Town’s Pollution Prevention/Good Housekeeping Program includes four primary
components: evaluate Town operations, corrective action, employee training, and public
awareness.

Affected Town Operations
The following facilities are owned by the Town and are included in Pollution
Prevention/Good Housekeeping Program:

1. Town Hall;
2. Town Operations Center;
3. Old Town Hall;
4. Community Building;
5. Arts and Recreation Community Center;
6. Veteran’s Park;
7. J.J. Brown Park;
8. Town Library
9. Water Distribution System;
10. Sanitary Sewer Collection System.
11. Town Street Network
Measurable Goals

A. Training
The Town will provide appropriate employees with information related to
preventing and reducing pollutant runoff from municipal operations. The
Town will further explore the feasibility of partnering with other regional Phase
II Communities to conduct at least one training session for Town employees
related to this topic. This training may be combined with training related to
the hazards associated with illegal discharges into the MS4 and improper
disposal of waste.

B. Public Awareness
Provide information to users of public facilities regarding efforts and
measures implemented, instructions for proper use of facilities, and penalties
for failure to comply.

C. Maintenance and Inspections
Ensure implementation of the following:
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The Town will perform street sweeping on all town streets on a
weekly basis.

The Town will utilize a vehicle wash area wherein all wastewater is
drained to the sanitary sewer, not the storm sewer system.

The Town will investigate and, where appropriate and feasible,
implement an Integ rated Pest Management Program wherein the
prevention and management of pests including insects, weeds and
plant disease is addressed by a minimally toxic method.

The Town will continue a systematic schedule of high-pressure
cleaning the piped portions of the town’s storm sewer system.

The Town will continue to limit the use of salt for safety in extreme
cold temperature events. W hen salt is required to provide for the
public safety, it is no more than a 1/3 salt - 2/3 sand mixture that is
limited to sidewalks and intersections.

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ANNUAL REPORTING
In order to help evaluate the effectiveness of the Town’s NPDES Phase II Stormwater Program,
NCDWQ requires the submittal of an annual report. The annual report submitted to NCDW Q is
an online report that quantifies program elements completed in the previous permit year. The
Town will complete and submit the report annually.

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LIST OF APPENDICES

Town of Ayden Phase II Stormwater Ordinance

Pitt County Flood Damage Prevention Ordinance

Inter-Local Agreement between Pitt County and Town of Ayden – Administration of the Pitt
County Flood Damage Prevention Ordinance

Pitt County Soil Erosion and Sedimentation Control Ordinance

Inter-Local Agreement between Pitt County and Town of Ayden – Administration of the Pitt
County Soil Erosion and Sedimentation Control Ordinance