2. NCS000465_SW Mgmt Plan_20210202

National Pollutant Discharge Elimination System
Phase II Stormwater Management Program
PERMIT NO. NCS000465
Stormwater Management Plan
Revised: December 13, 2017
Woo Morrisville
Stormwater
100 Town Hall Dr.
Morrisville, NC 27560
Prepared by:
Joshua B. Baird, E.I.
Stormwater Engineering Manager
Town of Morrisville
Engineering Department

TABLE OF CONTENTS
INTRODUCTION ...................................
1. Storm Sewer System Information
1.1 Population Served............................................................................
1.2 Growth Rate.....................................................................................
1.3 Jurisdictional Area............................................................................
1.4 MS4 Conveyance System................................................................
1.5 Estimated Land Use.....................................................................
1.6 TMDL Identification..........................................................................
2. Receiving Streams............................................................................
3. Existing Water Quality Programs .................................................
3.1 Local Programs................................................................................
3.2 State Programs.................................................................................
4. Permitting Information......................................................................
4.1 Responsible Party Contact List .......................................................
4.2 Organizational Chart........................................................................
4.3 Signing Official.................................................................................
4.4 Duly Authorized Representative........................................................
5. Co -Permit Status Information...........................................................
6. Reliance on Another Entity...............................................................
6.1 Name of Entity...................................................................................
6.2 Elements Implemented.....................................................................
6.3 Contact Information..........................................................................
6.4 Legal Agreement...............................................................................
7. Stormwater Management Program Plan ..........................................
7.1 Public Education and Outreach........................................................
7.2 Public Involvement and Participation ................................................
7.3 Illicit Discharge Detection and Elimination .......................................
7.4 Construction -Site Stormwater Runoff Control ...................................
7.5 Post -Construction Stormwater Management ....................................
7.6 Pollution Prevention/Good Housekeeping for Municipal Operations
APPENDICES...............................................................................................
Organization Chart
Inter -local Agreements
Illicit Discharge Detection and Elimination SOP
Pollution Prevention & Good Housekeeping SOPs
Administrative Manual
Unified Development Ordinance (UDO)
Engineering Design & Construction Manual (EDCM)
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Town of Morrisville
Comprehensive Stormwater Management Plan Last Revised: December 13, 2017
INTRODUCTION
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 Water 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.) communities 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 Environmental Quality (NCDEQ), Division of Energy,
Mineral, and Land Resources (DEMLR) administers the NPDES Stormwater program. The
Division of Water Resources (DWR) administers the nutrient strategy programs (Jordan Lake,
Neuse, etc.). The program requires the Town of Morrisville 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 is implemented through an NPDES permit in phases over five
years. Pursuant to the permit the stormwater program included the best management practices
(SCMs) for the following six minimum measures:
1. Public Education & Outreach
2. Public Involvement & Participation
3. Illicit Discharge Detection & Elimination
4. Construction Site Runoff Controls
5. Post -Construction Site Runoff Controls
6. Pollution Prevention & Good Housekeeping for Municipal Operations
The Town's Stormwater Management Program is administered by the Engineering Department.
The Stormwater Engineering Manager position serves as the Stormwater Program Manager, and
the Stormwater Division Supervisor. This position also oversees the riparian buffer program and
FEMA floodplain program. A copy of the organizational chart is included in the appendix.
Page 13

Town of Morrisville
Comprehensive Stormwater Management Plan Last Revised: December 13, 2017
Storm Sewer System Information
1.1 Population Served
18,576 2010 US Census
23,699 2015 ToM Special Census
1.2 Growth Rate
I
Estimated growth rate..........................................355.0% from the 2000 Census (5,208)
Estimated growth rate..........................................27.6% from the 2010 Census (18,576)
Estimated total potential buildout pop..................................................................*25,141
source: 2015 ToM Planning Dept. Est.; excludes apartments
1.3 Jurisdictional Area
Town of Morrisville Limits................................................................................8.4 sq. mi.
Total including ETJ...........................................................................................9.8 sq. mi.
1.4 MS4 Conveyance System
Most stormwater runoff begins in any given sub -basin as sheet flow (creating a "non -point
source" for surface water pollution) and ultimately becomes concentrated flow at the
receiving stream. In the Town's urban areas, stormwater runoff often becomes
concentrated prior to the receiving stream as it enters roadside ditches or piped
conveyance systems. As development occurs in the Town of Morrisville, an increasing
portion of runoff will flow across man-made impervious surfaces, and become
concentrated along typical curb and gutter systems conveying it to constructed pipe
networks or ditches. The runoff from most of the earlier development (pre 1999) flows
directly to surface waters, without any form of treatment. For development since
implementation of the Town's 1999 stormwater ordinance and 2005 Ph.I I permit, the runoff
flows to various detention systems and other structural Stormwater Best Management
Practices (SCMs) within the Town of Morrisville's jurisdiction prior to entering the receiving
stream. The majority of SCMs are on private property. The Town does own, operate, and
maintain twelve (12) structural SCMs that are on Town property or within the public right-
of-ways and/or drainage easements.
As with most modern storm sewer systems, the Town's MS4 is not combined with any
portion of its sanitary sewer system or other discharges (unless by illicit connections).
Currently, the responsibility for the stormwater conveyances and infrastructure rests
solely with the owner, or entity, which possesses specific rights to the system. Private
drainage systems and drainage ditches are maintained solely by property owners or
other responsible parties (i.e., homeowner's associations). NCDOT streets, storm
drainage, and right-of-way that traverse throughout the Town's ETJ are maintained by
NCDOT. The Town assumes responsibility for the upkeep of storm drainage pipes and
roadside ditches that exist inside the Town -owned right-of-way or drainage easements,
and several Town -owned structural SCMs. The Town has incorporated the stormwater
Page 14

Town of Morrisville
Comprehensive Stormwater Management Plan Last Revised., December 13, 2017
management program through the Unified Development Ordinance (UDO, effective July
1, 2014, Updated June 23, 2017) and the Engineering Design & Construction Manual
(EDCM, effective July 1, 2014, updated September 1, 2016). Those two documents
detail how the Town will enforce and regulate stormwater issues within its jurisdiction.
They supersede the previous Stormwater Management Ordinance (adopted February
28, 2012) and the Design and Construction Ordinance. A primary goal of the Town's
stormwater program is to assign responsibility to private owners and public agencies
alike and hold all parties, including itself, accountable for pollutants that enter the MS4
and for the water quality of its receiving streams.
1.5 Estimated Land Use
The Following breakdown is based on GIS data using Wake County parcel data dated
2014.
DISTRICT
ACRES
OF ZONED
LAND IN
MORRISVILLE
PGO
390.3
7.4
VLDR
123.1
2.3
LDR
568.8
10.8
666.9
12.7
65.6
1.2
HDR
635.1
12.1
NAC
142.1
2.7
C-NAC
4.3
0.1
BAC
68.3
1.3
CAC
95.9
1.8
268.5
5.1
HCV
27.6
0.5
MS
15.2
0.3
72.6
1.4
TCR
121.8
2.3
RT
49.8
0.9
RNP
52.3
1.0
200.8
3.8
572.8
10.9
•
96.1
924.7
1.8
17.6
AMA b
94.7
1.8
TOTAL
5257.3
100
1.6 TMDL Identification
Page 15
DistrictsTable 3.1.1: Zoning
Established
BASE DISTRICTS
Conservation Districts
Park Greenwa O en S ace (PGO) (Sec 3.2.2
Residential Districts
Very Low Density Residential LDR Sec 3.3.2
Low Density Residential (LDR) Sec 3.3-3
Medium Density Residential (MDR) Sec 3-3.4
Hi h Density Residential (HDR) {Sec_ 3.3-3
Activity Center Districts
Neighborhood Activity Center RAC Sec. 3-4-2
Business Activity Center [BACSec_ 3.4.3
Community AcrWity Center CAC Sec 3.4_4
Regional ActiVity Center (PAC) (Sec_ 3.45
Transit -Oriented Development (TOD) (Sec_ 3_d_6)
Town Center Districts
Historic Crossroads Village (HCV) (Sec_ 35-2
Main Street MS Sec_ 35-3
Town Center Commercial CC Sec_ 35-4
Town Center Residentiol CR Sec_ 3-3-3
Residential Trarnilian (RT) (Sec 3-5_6
Residential Neighborhood Preservation (RRP) (Sec 3.5_
Commercial and Industrial Districts
Corridor Commercial (CC) (Sec 3.6.2)
Office Institutional OI Sec_ 3.6.3
Industrial Management (IM) Sec_ 3.6.4
CONDITIONAL DISTRICrS
One parallel to each Base ❑istrict ahave (e_ _, C-NAC)
PLANNED DEVELOPMENT DLsTRIcTs
Akixed-Use Planned Development MUPD Sec 3.7-2
OVERLAY DISTRICTS
Airport Overlay -A (AD -A) (Sec 3-$-2
Airport Overlo -B AO-B Sec_ 3.8-2
Flood lain Overlay FO(Sec-3-8-3)
Town Center Conservation Overlay CCO Sec_
Section 303(d) of the Clean Water Act requires States to develop a list of waters not
meeting federal water quality standards and to correct the impaired waters by
developing a management strategy or a total maximum daily loading (TMDL). According

Town of Morrisville
Comprehensive Stormwater Management Plan Last Revised: December 13, 2017
to North Carolina's 2012 Final 303(d) List, portions of Crabtree Creek [27-33-(1) & 27-
33-(3.5)a] and Brier Creek [27-33-4] are the only streams within the Town's jurisdiction
listed as impaired. Crabtree Creek from the source to backwaters of Crabtree Lake is
currently impaired due to a poor benthic community bioclassification. Crabtree Creek
from the backwaters of Crabtree Lake to Cary WWTP is currently impaired due to
turbidity and for fish consumption based on a DHHS advisory for polychlorinated
biphenyls (PCBs). Brier Creek from the source to Crabtree Lake are impaired for fish
consumption based on a DHHS advisory for polychlorinated biphenyls (PCBs). The
Basinwide Plan recommends that local initiatives are needed to improve water quality in
Crabtree Creek and DWR encourages development of a land use plan and stormwater
program that protects the water quality in Crabtree Creek. The Town's NPDES Phase II
Stormwater Management Program is consistent with the recommendations in the
Basinwide Plan and should help improve water quality in Crabtree Creek through
implementation of the Stormwater Management Program (UDO Article 7), and Stream
Buffer Protection Program (UDO Article 6). The Town is currently developing a plan as
required by Section H of the NPDES permit.
The State of North Carolina has also developed management strategies that set forth
specific target levels of nutrient loading for certain nutrient sensitive waters. The Clean
Water Responsibility Act of 1997-458 requires the development of concentration limits
for wastewater discharges and restoration goals for nutrient sensitive waters.
Additionally, the SL 2005-190, adopted by the General Assembly in 2005 required the
development of nutrient strategies for drinking water supply reservoir watersheds. The
Neuse River Basin Management Strategies set forth various strategies (including
Riparian Buffer Rules) with the goal of reducing nitrogen to more acceptable levels.
Additionally, the Jordan Lake Water Supply Nutrient Strategy Rules were adopted by the
NC General Assembly in August 2009. A portion of Morrisville lies within the Upper New
Hope Arm of the Jordan Lake Watershed which was placed on the North Carolina's list
of impaired waters under Section 303(d) of the federal Clean Water Act for exceeding
the Chlorophyll A standard. The Jordan Lake Rules include target level nutrient
loadings and riparian buffer rule requirement that are applicable to the entire Cape Fear
River portion of the Town. From 2012, up until the passing of SL 2015-246 in
September 23, 2015, the UDO incorporated these measures and applied them to the
entire Town; including the Neuse River Basin portion. The nutrient targets no longer
apply in either basin, until the Jordan Lake new development rules are no longer
delayed.
Page 16

Town of Morrisville
Comprehensive Stormwater Management Plan Last Revised: December 13, 2017
2. Receiving Streams
Approximately 20% of the land area of the Town lies within the Upper New Hope Arm of
the Jordan Lake Watershed, which is part of the Cape Fear River Basin, with the remaining
80% draining to the Neuse River Basin via several tributaries. Specifically, the Town drains
to the receiving waters listed below.
Receiving
Water Quality
Use
Basin
Name
Stream Segment
Classification
Suportt
Water Quality Issue(s)
Rat g
I
Kit Creek
16-41-1-17-2-(0.3)
C; NSW
Not
Rated
n/a
LL
c� Q
o U
Kit Creek
16-41-1-17-2-(0.7)
WS-IV; NSW
Not
n/a
Rated
Brier Creek
27-33-4
C; NSW
Impaired
Standard Violation -
PCB
Coles
27-33-3
C; NSW
Not
n/a
Branch
Rated
Crabtree
Poor Bioclassification -
Creek
27-33-(1)
C; NSW
Impaired
Ecological/Biological
Integrity Benthos
Poor Bioclassification -
Ecological/Biological
Z
Crabtree
27-33-(3.5)a
B; NSW
Impaired
Integrity Benthos
Creek
Standard Violation —
PCB
Stirrup Iron
27-33-4-2
C; NSW
Not
n/a
Creek
Rated
Indian
UT to Crabtree
n/a
Not
n/a
Creek
Creek
Rated
i Receiving streams (except Indian Creek) determined using NCDWR Integrated Report GIS layers. Indian Creek
identification and naming based on local knowledge.
z Use Support Rating and Water Quality Parameter as given in Integrated Report (303(d) list).
Page 17

Town of Morrisville
Comprehensive Stormwater Management Plan Last Revised: December 13, 2017
3. Existing Water Quality Programs
3.1 Local Programs
The following programs and ordinances are being implemented within the Town's
jurisdiction.
To meet its regulatory requirements, the Town addresses most water quality issues
within the Engineering Department through enforcement of the UDO and EDCM as part
of the site plan and construction drawing review process. The Engineering Department
is also responsible for Stream Origin Determinations and implementation of the riparian
buffer ordinance by delegation from NCDWR. The only exception is the erosion and
sediment control program which, for development projects that disturb more than one
acre of land, are referred to Wake County for erosion control review, in accordance with
the NC Sedimentation Pollution Control Act of 1973. (Note: Wake County operates their
program under delegated authority from the NC DEMLR).
The Town is also in the process of coordinating with DWR and DEMLR to perform
inspections of the stormwater SCMs installed as part of 401 Certifications for facilities
within the Town; and potentially in the future, Industrial NPDES stormwater permitted
facilities.
3.2 State Programs
The State of North Carolina developed its own water quality standards and
classifications program pursuant to G.S. 143-214.1 and 15A NCAC 02B .0100 and
.0200. The State's program began in the early 1950's and has been modified over time
to be consistent with the Federal Clean Water Act as well as its own basin -wide
approach to water quality.
One aspect of the state basin -wide studies, which applies directly to the Town's surface
waters, is the classification of certain waters as nutrient sensitive waters (NSW
supplemental classification). The Neuse River NSW Management Strategy became
effective in 1998 and established a goal to reduce the average annual nitrogen loading,
relative to background levels, by a minimum of 30% by 2004. This management
strategy imposed basin -wide buffer regulations and required larger and growing
municipalities to implement NSW stormwater programs to help meet the 30% nitrogen
reduction goal. The Town of Morrisville was not one of these mandated municipalities;
however the Town voluntarily adopted and applied the nutrient sensitive water policies
from the Neuse River Basin regulations within its Design and Construction Ordinance
(DCO) on November 26, 2007. Through the DCO the Town enforced the Neuse River
nutrient reduction limits and buffer regulations throughout its entire jurisdiction, including
the Cape Fear River Basin until the Stormwater Management Ordinance took effect on
February 28, 2012, which imposed the stricter Jordan lake Nutrient Management
through the Town, which meets or exceeds the Neuse River strategy requirements. The
new UDO and EDCM now supersede those previous documents.
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Town of Morrisville
Comprehensive Stormwater Management Plan Last Revised: December 13, 2017
Legislation adopted during the 2009 legislative session by the North Carolina General
Assembly regarding the Jordan Lake Water Supply Nutrient Strategy Rules has been
incorporated into the Town's Stormwater Program through the Stormwater Management
Ordinance. Per the adopted legislation, Town of Morrisville is mandated to meet the
specific nutrient loading and buffer requirements for the Jordan Lake watershed.
Approximately 20% of Morrisville's land area is in the Cape Fear River Basin, all of
which is in the Jordan Lake watershed. The Jordan Lake Nutrient rules include target
level Nitrogen and Phosphorus loading and riparian buffer rule requirements that are
applicable to the Cape Fear River portion of the Town, and have been applied
throughout the Town for added water quality benefit and consistency of regulations
throughout town. From 2012, up until the passing of SL 2015-246 in September 23,
2015, the UDO incorporated these measures and applied them to the entire Town;
including the Neuse River Basin portion. The nutrient targets no longer apply in either
basin, until the Jordan Lake new development rules are no longer delayed.
The Town does rely on NCDOT to maintain stormwater facilities and programs within
their road rights -of -way.
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Town of Morrisville
Comprehensive Stormwater Management Plan Last Revised: December 13, 2017
4. Permitting Information
The Town's Stormwater Program is administered by the Engineering Department. The
Stormwater Engineering Manager position oversees the program as the Stormwater
Division Supervisor. A copy of the organizational chart is included in the appendix.
4.1 Responsible Party Contact List
Overall implementation and oversight of the Town's Stormwater Program is provided
through the Town's Engineering Department. The following table lists each separate
component program that will make up the Town's overall Stormwater Program as well as
the current individual and job title responsible for implementing it:
Component Program
Responsible Position
Overall Administration
Town Manager3
Program Oversight
Town Engineer4
Public Education & Outreach Program
Stormwater Engineering
Manager
Public Involvement & Participation Program
Stormwater Engineering
Manager
Illicit Discharge Detection & Elimination
Stormwater Engineering
Program
Manager
Construction Site Runoff Program
Wake County6
Post -Construction Stormwater Management
Stormwater Engineering
Program
Manager
Pollution Prevention/ Good Housekeeping
Stormwater Engineering
(Municipal O&M) Program
Manager
TMDL's
Stormwater Engineering
Manager
4.2 Organizational Chart
The Town's organization chart is included in the Appendix.
3 Martha Paige 1 [phone] 1 mpaige(d)townofmorrisville.org
4 Kent Jackson., P.E. 1 [phone] 1 kiackson(cDtownofmorrisville.org
S Joshua B. Baird, E.I. 1 [phone] 1 Ibaird(c�townofmorrisville.org
6 See contact information below in section 6.3
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Town of Morrisville
Comprehensive Stormwater Management Plan Last Revised: December 13, 2017
4.3 Signing Official
The Town 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:
Martha Paige - Town Manager
100 Town Hall Dr
Morrisville, NC 27560-0166
(Office) 919-463-6150
(Fax) 919-481-2907
MPaige(a)TownofMorrisville.org
4.4 Duly Authorized Representative
Not applicable. The Town of Morrisville is not delegating permit application responsibility
to someone other than the signing official.
5. Co -Permit Status Information
The Town is not co -permitting with another entity.
6. Reliance on another Entity
The Town relies on Wake County to provide the Town with services to implement the
Town's Construction Site Runoff Controls program. The Town has adopted the Wake
County Sediment and Erosion Ordinance under an established Interlocal Local
Agreement for Wake County to administer its sediment and erosion control program.
The Town of Morrisville currently relies on Wake County Environmental Services to
administer the sedimentation and erosion control program within the Town's jurisdiction
in accordance with the North Carolina Sedimentation Pollution Control Act of 1973. The
Town will continue this relationship as part of their NPDES Phase II Program to meet the
requirements of the Construction Site Stormwater Runoff Control minimum measure.
6.1 Name of Entity
Wake County Department of Environmental Services - Erosion, Flood and Stormwater
Division
6.2 Elements Implemented
Oversight and implementation of the Town's NPDES Phase II construction site runoff
controls program.
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Town of Morrisville
Comprehensive Stormwater Management Plan Last Revised: December 13, 2017
6.3 Contact Information
Wake County Department of Environmental Services
P.O. Box 550
Raleigh, NC 27602
http://www.wakegov.com/water/stormwater/erosion/Pages/defauIt.aspx
Betsy Pearce, CFM, CPSWQ
(Office) 919-868-6414
Betsy. Pea rce(a-)wa keg ov. co m
6.4 Legal Agreement
Recognizing the need for assistance and the benefits of local agreements, the Town
entered into an inter -local agreement with Wake County effective October 23, 2006.
Under this agreement, the Wake County Department of Environmental Services -
Erosion, Flood and Stormwater Division provides the Town with services to implement
the Town's construction site stormwater runoff control program. A copy of the inter -local
agreement is included in the appendix. This agreement was updated on May 16, 2016.
7. Stormwater Management Program
The following sections describe the Town's stormwater management program and
measurable goals for each SCM. While the SCMs under each minimum measure 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
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.
The Town continues to maintain a stormwater CIP database and ranking system. This
trackw stormwater CIP projects, drainage complaints, and illicit discharges. The Town's
stormwater inventory is currently in the process of being updated.
7.1 Public Education and Outreach
1. Objectives for Public Education and Outreach:
Distribute educational materials to the community or conduct equivalent outreach
activities about the impacts of storm water discharges on water bodies and the steps the
public can take to reduce pollutants in storm water runoff.
The Town's stormwater public education and outreach program includes:
Distribution of educational materials at Town events and making them available at
several Town properties (Town Hall, Public Safety and Municipal Services (PSMS), etc.),
Town Stormwater website www.ToMstormwater.org, Inclusion of a Stormwater Matters
article in the monthly Morrisville Connection newsletter, Booth presence at Morrisville's
SpringFest and National Night Out annually, SCM educational displays at Town owned
SCMs, Stormwater "giveaways" (pet waste bag dispensers, cups pens, etc.),
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Town of Morrisville
Comprehensive Stormwater Management Plan Last Revised: December 13, 2017
Membership in the Clean Water Education Partnership to provide educational materials
and support to the public via radio and TV commercials, website, and handouts.
2. SCMs for Public Education and Outreach
a.) The goals and objectives of the Town are to inform and distribute educational
materials to the community and/or conduct equivalent outreach activities about the
impacts of pollutants in storm water discharges on water bodies and the steps that
the public can take to reduce pollutants in storm water runoff.
b.) The target pollutants and/or stressors of concern in the receiving waters of the Town
of Morrisville MS4 are:
• Sediment and other suspended solids
o This is the number 1 pollutant in North Carolina, including Morrisville, due
to the highly erodible Triassic and Clay -based soils.
o 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.
o Likely Sources are non -stabilized lawns and steep slopes, newly graded
and denuded areas on construction sites, flashy urban runoff, and mining
and materials distribution centers.
• Excess Nutrients such as Nitrogen and Phosphorus
o Town lies within the Neuse River Basin and Cape Fear River Basin
(Jordan Lake watershed), both of which have been classified Nutrient
Sensitive waters by NCDEQ.
o These pollutants affect the ability of the receiving stream to support
biological communities by promoting high algal growth in downstream
waterbodies causing low oxygen levels.
o Likely sources include excess fertilizer from lawns, atmospheric
deposition on impervious areas, urban runoff, pet waste and organic
matter, and nutrients in eroded soils. The Town is planning to explore
adoption of a pet waste ordinance that would help educate and reduce
nutrients and fecal coliform in the runoff.
• LitterNard Waste
o Litter and yard waste can block stormwater conveyances, and as litter
and yard waste decompose they introduce chemicals and additional
nutrients into the storm system, eventually entering the surface water
body. Additionally, yard waste placed along embankments can limit
natural vegetation from establishing, making them unstable and allowing
erosion.
Page 1 13

Town of Morrisville
Comprehensive Stormwater Management Plan Last Revised: December 13, 2017
The target audiences include various groups within the MS4 area to include, but not
limited to:
• Homeowners
o will be informed of the proper use and handling of yard wastes to protect
surface waters. The Town's Public Works Department provides
scheduled collection of yard wastes. Citizens are also instructed to bag
the yard waste and not pile it in the road or gutter.
o will be educated on proper fertilizer & herbicide application rates to
minimize nutrient loading in the receiving streams, as they are highly
likely to less experience performing these actions.
o will also be informed of Town programs for recycling.
o will be informed about harmful pathogens that can pollute stormwater if
pet waste is not collected and disposed of properly.
• Landscaping companies will be informed of the proper use and handling of yard
wastes and fertilizer application rates to minimize nutrient loading in the receiving
streams, and commercial applicators will be required to complete the Jordan
Lake Fertilizer Training course
• Programs will also be aimed at teaching school children in the town the
importance of water conservation and protection of our natural water systems
from litter and pollutants.
• Contractors and developers in the area will be targeted to educate on the effects
of increased sediment loads on the receiving streams.
• Local restaurant and industrial groups will be targeted to inform them of the
impacts of grease and hazardous materials entering the storm drain system.
• Special interests groups (HOAs, Churches, Boy/Girl Scout Troops, etc.) will be
given educational presentations about the effects polluted stormwater on water
bodies as requested.
Residential and industrial/commercial issues include:
• Developments with high impervious surfaces
• Properties under construction with active land disturbance activities
• Existing properties with facilities in need of maintenance or repair
• Industrial NPDES facilities permitted by DEMLR
The Town shall:
• Distribute educational materials to the community by making them available at
Town facilities frequented by residents
• Maintain the stormwater hotline: 919-463-SOAK (7025)
• Maintain the informational website: www.ToMstormwater.org
• Conduct outreach activities (presentations, booth set-ups, etc.) addressing
impacts of storm water discharges on water bodies and the steps the public can
take to reduce pollutants in storm water runoff through educational programs,
local events (such as the annual Spring Fest, etc.)
• Place informational flyers at Town Hall, PSMS, etc.
• Provide articles to the local newsletter.
o Paper copies of the newsletter will be distributed at various events and
educational programs.
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Town of Morrisville
Comprehensive Stormwater Management Plan Last Revised: December 13, 2017
o Work with the Town's public information officer to post the newsletter on
the Town's website and send a notification when a new issue is available
to those subscribed to the Town's email notification list
• Partner with other local government departments conducting environmental
education to conduct school programs as resources are available.
• Participate in the Clean Water Education Partnership (CWEP):
http://www.nccwep.org
7.2 Public Involvement and Participation
The Town's stormwater public involvement and participation program includes
maintaining an informational website with contact information and participation in local
events and festivals such as Morrisville's Green Day, NC Big Sweep, partnering with
volunteer groups, as requested, for stream monitoring and cleanup, Town Council and
Planning Board, rain barrel program, and the stormwater citizen advisory committee
(MESC Committee).
The Town shall provide stormwater content and information on the Town's website at:
www.ToMstormwater.ora
The Town shall provide promote and maintain a hotline/helpline at 919-463-SOAK
(7025).
The Town shall distribute handouts and information on rain barrels, yard waste,
fertilizer/pesticide/herbicide application, and other stormwater related issues to local
citizens through events, festivals, and information requests.
The Town may conduct up to two (2) Stormwater Program workshop annually to inform
the residents of the various aspects of the program, answer questions, and distribute
additional literature. This may be done as part of another meeting (Town Council,
MESC Committee, etc.) or standalone meetings.
The Town will present semi-annual reports to the Town Council; or at another frequency
as directed by Town Council.
7.3 Illicit Discharge Detection and Elimination
The objectives of the Town's Illicit Discharge Detection and Elimination Program are:
a. Implement and enforce a program to address the detection and elimination of
illicit discharges into the MS4.
b. Maintain a storm sewer system map, showing the location of all SCMs, major
outfalls, and the names and location of all waters of the state that receive
discharges from those outfalls;
c. Prohibit, through ordinance, or other regulatory mechanism, non -storm water
discharges except as allowed in this permit and implement appropriate
enforcement procedures and actions;
d. Implement a plan to detect and address non -storm water discharges, including
illegal dumping, to the MS4;
e. Inform public employees, businesses, and the general public of hazards
associated with illegal discharges and improper disposal of waste; and
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Comprehensive Stormwater Management Plan Last Revised: December 13, 2017
f. Address non -storm water discharges or flows (i.e., illicit discharges) if identified
as significant contributors of pollutants to the MS4.
The Town has an Illicit Discharge Detection and Elimination Ordinance included in
Article 7 of the UDO. The Town shall annually review the IDDE ordinance or other
regulatory mechanisms, or adopt any new ordinances or other regulatory mechanisms
that provide the permittee with adequate legal authority to prohibit illicit connections and
discharges and enforce the approved IDDE Program.
The Town shall develop and maintain a current map showing major outfalls and
receiving streams. The Town maintains a Geographic Information System (GIS)
database that includes drainage areas, receiving streams, land use information, zoning,
soils, floodplain data, water quality designations, impervious cover and other pertinent
data. This information is updated periodically often based on actual site reconnaissance,
such as on site surface water identifications. A field survey of all Town maintained
stormwater infrastructure has recently been completed. This is planned to be updated to
include private drainage systems in the next few years as resources allow. This GIS
database includes all stormwater drainage structures (pipes, inlets, outfalls, and SCMs).
The Town is in the process of enhancing a program for conducting dry weather flow
monitoring in accordance with a written procedure for detecting and removing the
sources of illicit discharges.
The Town shall develop and maintain written procedures for conducting investigations of
identified illicit discharges.
The Town tracks all investigations and documents the date(s) the illicit discharge was
observed; the results of the investigation; any follow-up of the investigation; and the date
the investigation was closed.
The Town trains appropriate municipal staff who as part of their normal job
responsibilities, may come into contact with or otherwise observe an illicit discharge or
illicit connection to the storm sewer system.
The Town informs public employees, businesses, and the general public of hazards
associated with illegal discharges and improper disposal of waste. The Town conducts
one (1) training session for Town employees in positions frequently exposed to potential
IDDE events and provides information regarding appropriate training sessions provided
by other entities. In addition, the Town is exploring the possibility of providing training to
all newly hired employees through the Town's LAUNCH training program; and to the
Police and Fire Departments.
The Town shall promote, publicize, and facilitate a reporting mechanism for the public
and staff to report illicit discharges and establish and implement citizen request response
procedures.
The Town tracks the issuance of notices of violation and enforcement actions as
administered by the permittee.
7.4 Construction -Site Stormwater Runoff Control
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Comprehensive Stormwater Management Plan Last Revised: December 13, 2017
Pursuant to 40 CFR 122.35(b), the Town relies on the Wake County Sediment and
Erosion Control Program to comply with this minimum measure. The Wake County
Sediment and Erosion Control Program effectively meets the maximum extent
practicable (MEP) standard for Construction Site Runoff Controls by permitting and
controlling development activities disturbing one or more acres of land surface and those
activities less than one acre that are part of a larger common plan of development as
authorized under the Sediment Pollution Control Act of 1973 and Chapter 4 of Title 15A
of the North Carolina Administrative Code. The Wake County Sediment and Erosion
Control Program continues to be monitored by the State to ensure the County effectively
meets the MEP standard established by the Sediment Pollution Control Act of 1973 and
Chapter 4 of Title 15A of the North Carolina Administrative Code.
The NCG010000 permit establishes requirements for construction site operators to
control waste such as discarded building materials, concrete truck washout, chemicals,
litter, and sanitary waste at the construction site that may cause adverse impacts to
water quality. This NPDES General Permit is issued by Wake County along with the
sediment and erosion control approval. Inspection and enforcement is handled by DWR.
The Town is currently in the process of developing a MOA with DWR so that the Town
can assist with inspections for this general permit for projects within the Town.
The Town provides and promotes a means for the public to notify the appropriate
authorities of observed erosion and sedimentation problems by promoting the existence
of the DEMLR "Stop Mud" hotline, the Town's Stormwater Hotline, and providing a
"Report a Concern" link on the Town's website at:
http://www.townofmorrisville.orq/RequestTracker.aspx .
7.5 Post -Construction Stormwater Management
The objectives of the Town's Post -Construction Stormwater Management Program is to:
a. Implement and enforce a program to address stormwater runoff from new
development and redevelopment projects that disturb greater than or equal to
one acre residential or one-half acre non-residential, including projects less than
the disturbance threshold that are part of a larger common plan of development
or sale. The program shall ensure that controls are in place that would prevent or
minimize water quality impacts.
b. Implement strategies which include a combination of structural and/or non-
structural best management practices (SCMs) appropriate for the community;
C. Use the UDO and other regulatory mechanisms (EDCM, NCDENR SCM Design
Manual, etc.) to address post -construction runoff from new development and
redevelopment projects; and
d. Provide adequate long-term operation and maintenance of SCMs.
The Town maintains through an ordinance, or other regulatory mechanism, adequate
legal authorities to meet the objectives of the Post -Construction Site Runoff Controls
program. In February 2012 (revised July 2012), the Town formed the Stormwater
Management Ordinance (SMO), an independent regulatory mechanism based on the
Jordan Lake program model ordinance requiring additional post -construction stormwater
controls. The UDO supersedes the SMO and integrates the post -construction
stormwater requirements. In addition to the specific post -construction stormwater
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requirements listed above, the Town employs other policies, practices and regulations
that help protect water quality of its receiving waters. Measures currently in place help to
protect natural resources, protect open space, preserve trees, and regulate
redevelopment and street design. Through future policies the Town plans to address
green infrastructure elements and practices and incorporate a detailed list and
description of those measures into a "design manual". In addition, the Town will likely
implement guidance currently being developed by the DENR LID STRT. During its UDO
process, the Town is evaluating additional measures, especially aspects of low impact
development and improved site design to minimize water quality impacts even further.
Stormwater staff is working with the Town's planning staff during the pre -development
phase of projects to help guide site design that minimizes water quality impacts
The Town has the authority to review designs and proposals for new development and
redevelopment to determine whether adequate stormwater control measures will be
installed, implemented, and maintained.
The Town has the authority to request information such as stormwater plans, inspection
reports, monitoring results, and other information deemed necessary to evaluate
compliance with the Post -Construction Stormwater Management Program.
The Town has the authority to enter private property for the purpose of inspecting at
reasonable times any facilities, equipment, practices, or operations related to stormwater
discharges to determine whether there is compliance the Post -Construction Stormwater
Management Program.
The Town has adopted the NCDENR Stormwater SCM Manual, and created a Design
Manual (EDCM) that incorporates Town preferred methods that meets the requirements
in the SCM Manual. The Town utilizes both structural and non-structural SCMs to treat
and control post -construction stormwater. Non-structural SCMs include stream buffers,
flood hazard zone protection, landscape requirements, and educational materials.
Structural stormwater SCMs include those listed in the SCM Manual. The Town will
consider non-standard practices that may not be covered in the current SCM Manual on
a case by case basis if the applicant can provide evidence that they meet or exceed the
intent of the ordinance.
The Town conducts site plan reviews of all new development and redeveloped sites that
disturb greater than or equal to one acre for residential, and one-half acre for non-
residential, including sites that disturb less than the above thresholds that are part of a
larger common plan of development or sale. The site plan review addresses how the
project applicant meets the performance standards and how the project provides for
long-term maintenance.
The Town maintains an inventory of projects with post -construction structural stormwater
control measures installed and implemented at new development and redeveloped sites,
including both public and private sector sites located within the Town's jurisdictional area
that are covered by its post -construction ordinance requirements. The Town is currently
in the process of developing a MOA with DWR to facilitate inspecting stormwater SCMs
within the Town's jurisdictional area that were installed under a 401 Certification from
DWR.
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Comprehensive Stormwater Management Plan Last Revised: December 13, 2017
The Town provides mechanisms so that development activities maintain the project
consistent with approved plans. This includes approval of as -built record drawings,
detailed inspections annually, inspections after significant maintenance activities, and
"windshield" inspections after rainfall events above 1 inch.
The Town requires an operation and maintenance plan, and permanent drainage
easements, for the long-term operation and maintenance of the structural SCMs
required by the program, as well as a monetary (cash) maintenance security that is held
by the Town.
To ensure that all stormwater control measures meet the Town's performance
standards and are being maintained pursuant to the maintenance agreement, the
permittee has a written inspection program for structural stormwater controls installed
pursuant to the Town's post -construction program. The Town inspects new structural
stormwater SCMs at the time the project is complete to ensure compliance with
approved plans. New SCMs are tracked using GPS/GIS technology. Annual inspection
reports were previously submitted by the owner and certified by an approved
professional. Starting in FY 2014, the Town began conducting these annual
inspections/reports for all SCMs as a service of the Town's stormwater utility fee.
Follow-up inspections are conducted by the Town as warranted and inspection reports
are provided to owner outlining follow up actions.
The Town maintains records of inspections, findings and enforcement actions
The Town makes available through paper or electronic means, ordinances, post -
construction requirements, design standards checklist, and other materials appropriate
for developers.
The Town tracks the issuance of notices of violation and enforcement actions as
administered by the permittee.
7.6 Pollution Prevention & Good Housekeeping for Municipal Operations
The Town is continually improving the pollution prevention/good housekeeping program
that includes three primary components:
1. Operation and Maintenance (O&M) of facilities and operations owned and
operated by the Town with the potential for generating polluted stormwater
runoff,
2. O&M of municipally -owned streets, roads, and public parking lots within the
jurisdictional area, and
3. O&M of municipally -owned or operated structural stormwater controls and
drainage systems.
The Town maintains an inventory of facilities and operations owned and operated by the
Town with the potential for generating polluted stormwater runoff. The following facilities
are owned by the Town and included in the Good Housekeeping plan:
1. Parks and Recreation Areas
2. Emergency Services (Emergency Response, Police and Fire Departments)
3. Vacant Properties
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Comprehensive Stormwater Management Plan Last Revised: December 13, 2017
4. Permittee Buildings
5. Public Owned Open Spaces
6. Salt/Sand Storage Areas
7. Fleet Maintenance
8. Material Storage Facilities
9. Streets & Parking Lots
10. Floor Drains
11. Oil / Water Separator(s)
The Town also maintains public road rights -of -way (ROW) in portions of their jurisdiction
that are not owned by NCDOT, including catch basins and conveyance systems.
The Town maintains and implements an O&M program for municipal owned and
operated facilities with the potential for generating polluted stormwater runoff,
municipally -owned streets, roads, and public parking lots and Municipally -owned or
operated structural stormwater controls. The O&M program specifies the frequency of
inspections and routine maintenance requirements. Within non-NCDOT road ROW, the
Town maintains and implements an O&M program for municipally -owned streets, roads,
and public parking lots within the jurisdictional area. The Town maintains and
implements an O&M program for municipally -owned or operated structural stormwater
controls.
The Town conducts appropriate Good Housekeeping training for new employees and
provides "refresher" training to employees as warranted. As staff time and resources
allow, the Town intends to expand Good Housekeeping training to all Town employees,
even those not directly involved with Good Housekeeping requirements.
The Town currently washes vehicles at a commercial auto wash facility.
APPENDICES
Organization Chart
Inter -local Agreements
Illicit Discharge Detection and Elimination SOP
Pollution Prevention & Good Housekeeping SOPs
Administrative Manual
Unified Development Ordinance (UDO)
Engineering Design & Construction Manual (EDCM)
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