NCS000466_MS4 Annual Report (2022-23 FY)_20230822

FISCAL YEAR 2023 I TOWN OF HILLSBOROUGH
IIIReportNPDES Phase . 1 Annual
• Stormwater Management Program
July 2022—June 2023 Published August 2023
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The mission of this program is to reduce stormwater runoff
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Down the Drain

Town of Hillsborough Stormwater Management Program
NPDES Phase II Annual Report Fiscal Year 2023
TABLE OF CONTENTS
INTRODUCTION 1
1. Storm Sewer System Information 2
1.1 Population Served 2
1.2 Growth Rate 2
1.3 Jurisdictional Area 2
1.4 MS4 Conveyance System 2
1.5 Land Use Composition 2
1.6 TMDL Identification 3
2. Receiving Streams 3
3. Existing Water Quality Programs 3
3.1 Local Programs 3
3.2 State Programs 4
4. Permitting Information 4
4.1 Responsible Party Contact List 4
4.2 Signing Official 4
5. Co-Permit Status Information 5
6. Reliance on Another Entity 5
6.1 Contact Information 5
6.2 Legal Agreement 5
7. Stormwater Management Program Plan 5
7.1 Public Education and Outreach 5
7.2 Involvement and Participation 8
7.3 Illicit Discharge Detection and Elimination 10
7.4 Construction-Site Stormwater Runoff Control 12
7.5 Post-Construction Stormwater Management 13
7.6 Pollution Prevention for Municipal Operations 16

Town of Hillsborough Stormwater Management Program
NPDES Phase II Annual Report Fiscal Year 2023
INTRODUCTION
Why Care About Stormwater?
Adding impervious surface decreases the amount of stormwater that infiltrates into the
ground. This increases the amount and velocity of stormwater runoff. This can cause
accelerated erosion and downstream flooding. In addition, as stormwater flows across
impervious surfaces, it picks up various pollutants. These include excess nutrients, oil and
grease, bacteria and sediment. Polluted stormwater flows down storm drains and ditches
where it is discharged, untreated, into local 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 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) administers the
NPDES Stormwater program. NCDEQ issued the Town of Hillsborough's (Town) initial
Phase II permit, on October 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 five years of the initial permit. Pursuant to the permit the stormwater program included
the following six minimum measures or best management practices (BMPs):
1. Public education and outreach on stormwater impacts;
2. Public involvement/participation;
3. Illicit discharge detection and elimination;
4. Construction site stormwater runoff control (Erosion Control);
5. Post-construction stormwater management for new development and
redevelopment;
6. Pollution prevention/good housekeeping for municipal operations.
The Town's current permit, Number NCS000466, was issued on February 27, 2017. This
annual report reflects reporting requirements pursuant to the permit. Numbers reported
are for the fiscal year 2022-2023, which runs from July 1, 2022 to June 30, 2023 and is
referred to hereafter as FY2023.
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Town of Hillsborough Stormwater Management Program
NPDES Phase II Annual Report Fiscal Year 2023
1. Storm Sewer System Information
1.1 Population Served
Estimated population served 9,6601
1.2 Growth Rate
Estimated increase 2010-2020 58.7%2
1.3 Jurisdictional Area
Town Limits 5.7 sq. mi
ETJ 3.5 sq. mi.
1.4 MS4 Conveyance System
Due to the age of the town, the MS4 consists of a variety of stormwater
conveyances and components. These range from typical curb and gutter systems
conveyed by concrete 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 various detention systems within the
Town's jurisdiction, however these are on private property.
MS4 system components are periodically inspected to ensure proper function. The
North Carolina Department of Transportation (NCDOT) maintains systems within
state road rights-of-way. Systems located on private property, including detention
facilities and other engineered stormwater controls, are maintained by the owner.
1.5 Land Use Composition
Estimated Land Use3
Residential 36%
Commercial 30%
Industrial 5%
Open Space 29%
Total 100%
1 April 2020 US Census Bureau, 2020 Census, PL94-171 as provided by the North Carolina Office of Budget
and Management, State Demographics Data, http://www.osbm.state.nc.us/.
2 Percentage increase from 2010 to 2020(April 2020 Us Census Bureau, 2020 Census PL94-171 as
provided by the North Carolina Office of Budget and Management, State Demographics Data,
http://www.osbm.state.nc.us/.
3 Land use percentages were estimated from the Town of Hillsborough Land Use GIS database. Area of
parcels for each designated land use type were summed and calculated for relative percentage of the
planning jurisdictional area.
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Town of Hillsborough Stormwater Management Program
NPDES Phase II Annual Report Fiscal Year 2023
1.6 TMDL Identification
Currently, no streams flowing into or out of the Town of Hillsborough's jurisdiction
have an associated Total Maximum Daily Load.
2. Receiving Streams
The Town of Hillsborough lies entirely within the Falls Lake Watershed, which is part
of the Neuse River Basin. Specifically, the Town drains to the Eno River. Receiving
waters are listed below.
Receiving Description Classification Index No.
Stream
Eno River From a point 0.4 mile upstream WS-11; HQW, 27-2-(3.5)
(Corporation of Dry Run to dam at Lake Ben CA, NSW
Lake, Johnston (Orange County water
Lake Ben supply intake & Town of
Johnston) Hillsborough water supply
intake)
Eno River From dam at Lake Ben C; NSW, N 27-2-(7)
Johnston to Orange County SR
1561
Seven Mile From a point 0.4 mile upstream WS-11; HQW, 27-2-6-(1.5)
Creek of 1-85 to Lake Ben Johnston, CA, NSW
Eno River
Rocky Run From a point 0.5 mile upstream WS-11; HQW, 27-2-6-2-(2)
of 1-85 to Seven Mile Creek NSW
Cates Creek From source to Eno River C; NSW 27-2-8
Strouds Creek From source to Eno River C; NSW 27-2-9
Stony Creek From source to a point 0.4 mile C; NSW 27-2-13-(1)
upstream of Orange County SR
1710
3. Existing Water Quality Programs
3.1 Local Programs
The following programs and ordinances are being implemented within the Town of
Hillsborough's jurisdiction.
Unified Development Ordinance (UDO) — regulates overall development and land
use. Specific water quality aspects include local stream buffer rules and post
construction stormwater requirements, including nutrient limits.
Flood Damage Prevention — through its UDO the Town protects water quality by
preventing new development within flood hazard zones.
Local Nutrient Sensitive Waters (NSW) Strategy - through its UDO the Town
adopted stormwater requirements for new development to meet the Falls Lake
Nutrient Management Strategy (Falls Lake rules).
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Town of Hillsborough Stormwater Management Program
NPDES Phase II Annual Report Fiscal Year 2023
Delegated Erosion and Sediment Control Program - as noted in Section 6, the
Town relies on Orange County to conduct an erosion control program. Orange
County has local delegated authority from the state.
3.2 State Programs
State programs, including the Neuse, Falls Lake, and Water Supply Watershed
rules are implemented at a local level. The Town of Hillsborough does rely on
NCDOT to maintain stormwater facilities and programs within state-owned road
rights-of-way.
4. Permitting Information
The Town's Stormwater Program is under direction of the Stormwater and
Environmental Services Manager. Stormwater and Environmental Services is a
division of the Town's Community Services Department and is supervised by the
Assistant Town Manager/Community Services Director. This department also includes
Planning and Economic Development, Public Works and Public Spaces and
Sustainability.
4.1 Responsible Party Contact List
Overall implementation and oversight of the Town's Stormwater Program is
directed by:
Terry Hackett, Stormwater & Environmental Services Manager
Town of Hillsborough
P.O. Box 429
101 E. Orange Street
Hillsborough, NC 27278
Telephone: [phone]
Email: [e-mail]
4.2 Signing Official
The Town of Hillsborough 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:
Eric Peterson, Town Manager
Town of Hillsborough
101 E. Orange Street
P.O. Box 429
Hillsborough, NC 27278
Telephone: [phone]
Email: [e-mail]
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Town of Hillsborough Stormwater Management Program
NPDES Phase II Annual Report Fiscal Year 2023
5. Co-Permit Status Information
The Town of Hillsborough holds its own NPDES Phase II permit and does not co-
permit with another entity.
6. Reliance on Another Entity
The Town of Hillsborough utilizes Orange County to implement the Construction Site
Stormwater Runoff Control (i.e. erosion control) portion of its stormwater program.
6.1 Contact Information
Erosion Control Program: Steve Kaltenbach, Erosion Control Supervisor
Orange County Planning and Inspections Department
131 W Margaret Lane, Suite 201
Hillsborough, NC 27278
919-245-2588
[e-mail]
6.2 Legal Agreement
The Town maintains an inter-local agreement with Orange County to provide
erosion control services. The current agreement was approved in October 2012.
7. Stormwater Management Program Plan
The following sections briefly describe the Town's stormwater management program
for each of the six BMPs. Detailed information regarding each program area can be
found in the Town's comprehensive stormwater management plan, available on the
Town's website.
7.1 Public Education and Outreach
The objective of the Town's stormwater public education and outreach program is
to increase citizen awareness of stormwater runoff pollution and related issues.
The Town's stormwater public education and outreach program includes the
following primary components:
• Disseminate Educational Materials
The Town disseminates educational materials that are either developed in-
house or use existing materials available from other agencies. These materials
are distributed electronically, at educational programs, special events and
directly to individual citizens or businesses.
• Stormwater Newsletter, Articles and Press Releases
The Town publishes the Storm water Almanac, a newsletter that educates and
informs citizens about stormwater management issues within the Town. In
addition, Town stormwater staff often write articles on various stormwater
program related topics that are published in other periodicals. Stormwater staff
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Town of Hillsborough Stormwater Management Program
NPDES Phase II Annual Report Fiscal Year 2023
also coordinate with the town's Public Information Office for press releases
from the Town highlighting stormwater management related issues,
stormwater related volunteer events, etc.
• School programs
The Town conducts direct educational, stormwater related programs for local
schools. This includes partnering with other local governmental agencies
conducting environmental education programs in local schools. Annual
programs include Earth Walk with local seventh grade students, Eno River field
trip with Orange High AP Environmental/Earth Science classes, school science
nights, as well as other programs as requested.
• Special Events and Civic Groups
The Town provides stormwater education and outreach programs/materials at
local special events such as "Last Fridays", "Earth Evening" and "Government
101." Town stormwater staff also provides educational programs to various
civic groups, including local scout units, homeowner associations, garden
clubs, churches and various other groups.
• Social Media
The Town maintains a Facebook page (www.facebook.com/ToHGovSW/) and
Twitter account (@ToHGovSW) for the Stormwater and Environmental
Services Division. Weekly posts provide education on pollution prevention,
encourage citizens to explore nature and enjoy the Town's water resources,
and promote special events and volunteer workdays.
• Clean Water Education Partnership.
The Town of Hillsborough actively participates in the Clean Water Education
Partnership (CWEP). CWEP assists member governments with their
stormwater outreach and education program by leveraging member dues to
conduct various media campaigns. The FY2023 CWEP annual report can be
accessed from their website, https://nc-cleanwater.com/.
FY2023 Summary statistics for the primary components of the Town's Public
Education and Outreach Program are provided in the following sections.
7.1.1 School Program Statistics
School Stormwater Education Programs - FY2023
Program Students Giveaways/
Certificates
The Little School — Riparian Buffer Program 27 The Expedition School — Earthwalk 98 21
Orange Middle School — Earthwalk 137 18
Stanback Middle School — Earthwalk 151 24
Total 413 63
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Town of Hillsborough Stormwater Management Program
NPDES Phase II Annual Report Fiscal Year 2023
7.1.2 Outreach, Special Events and Other Program Statistics
Outreach, Special Events and Other Programs - FY2023
Program Participants Handouts/
Giveaways
Cornwallis Hills Property Owners 7 -
Association Board Meeting
Corbin Creek Woods SCM Kick-Off 4 -
Meeting
Forest Ridge HOA SCM Kick-off Meeting 5 -
Blackwood Farm Park Grand Re-Opening 38 21
Engage Hillsborough: Safety 29 15
TFF Eno River Clinic 10 10
Odie St Native Planting Workshop 11 22
Triangle Fly Fishers - Beginner's Clinic 26 18
Total 130 86
7.1.3 Newsletters, Articles and Press Release Statistics
Newsletters, Articles and Press Release Statistics — FY2023
Storm water Almanac (newsletter) Issues Published 1
Stormwater Related Press Releases 6
Stormwater Related Articles Written/Published 1
7.1.4 Town of Hillsborough Social Media Statistics
Twitter Anal tics - FY2023
Posts 68
Followers 233
Impressions4 5831
(continued on next page)
4 Count of times a post entered a person's screen.
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Town of Hillsborough Stormwater Management Program
NPDES Phase II Annual Report Fiscal Year 2023
(continued from previous page)
Facebook Page Analytics - FY2023
Posts 74
Followers 259
Reach5 9151
Facebook Post Analytics - FY2023
Post Reach6 1125
Post Engagement' 1613
7.2 Involvement and Participation
The objective of the Town's public involvement and participation program is to
strengthen citizen engagement in stormwater and environmental issues affecting
the Town. Public Involvement and participation includes providing volunteer
opportunities, exchanging information with citizens and elected officials, and
providing public assistance on stormwater related issues.
• Volunteer Opportunities
Town Stormwater and Environmental Services Division staff coordinates
volunteer opportunities to raise awareness of stormwater runoff pollution,
engage citizens and ultimately reduce target pollutants. Volunteer
opportunities regularly include trash/litter clean-ups, wetland/riparian
vegetation planting, invasive species removal/monitoring, qualitative stream
monitoring, and maintenance of the Town's pollinator/rain gardens and
stormwater wetland. In recent years,the town has participated in "Creek Week"
which is a regional effort to engage citizens on stormwater and water quality
related issues.
• Public Meetings
At a minimum, Town Stormwater and Environmental Services Division staff
presents one update to Hillsborough's elected Town Board of Commissioners
regarding the stormwater program, annually. As part of the presentation, Town
Commissioners can provide input on pertinent issues. Staff may also provide
presentations to other Town advisory boards as requested.
• Public Assistance
Town Stormwater and Environmental Services staff provides assistance to
citizens regarding stormwater pollution prevention, riparian buffer regulation,
5 The number of people who saw any content from or about the page, including posts, stories, and social
information from people who interact with the page.
6 Count of people for whom a post entered their screen.
'Total likes, reactions, replies, link clicks,comments, and shares associated with a post.
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Town of Hillsborough Stormwater Management Program
NPDES Phase II Annual Report Fiscal Year 2023
drainage issues and other related topics. This includes site visits and
investigations as necessary.
In addition to the items listed above, the Town maintains a website with pertinent
stormwater information. This includes email and phone numbers of stormwater
staff so that citizens can report concerns. Other than emails and calls received,
Town Stormwater and Environmental Services staff does not report website
statistics.
FY2023 Summary statistics for the primary components of the Town's Public
Involvement and Participation Program are provided in the following sections.
7.2.1 Volunteer Opportunity Statistics
Tree/Wetland Plantings - FY2023
Name/Location Participants Trees/ Acres
Plants
200 Odie St Bioswale Planting 5 125 0.01
Native plant garden for Chir Htoo & Ni Ni 7 96 0.01
Keo Ksor
Native plant garden for Annah Nyarangi 14 110 0.01
Riverwalk Compost Blanket 12 - 0.01
Odie Street Bioswales Planting Event 26 115 0.01
Odie Street Bioswales Sod Installation 3 - 0.01
Total 53 446 0.06
Litter/Trash Clean-ups— FY2023
Number of Events 8
Number of Volunteers 37
Miles Cleaned 3
Pounds Collected 180
Volunteer Monitoring — FY2023
Number of Groups 2
Number of Monitoring Locations 2
Total Number of Volunteers 16
Number of Actions Completed as a result8 2
8 The monitoring events were at the Gold Park stormwater wetland,where a small group of volunteers removed
trash, cattails and other nuisance vegetation, and a group of volunteers removed invasive species within
Gold Park riparian buffer.
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Town of Hillsborough Stormwater Management Program
NPDES Phase II Annual Report Fiscal Year 2023
7.2.2 Public Meeting Statistics
Stormwater Related Public Meeting — FY2023
Number of Public Meetings 3
Number of Attendees9 53
7.2.3 Public Assistance Statistics
Public Assistance— FY2023
Number of Calls, Complaints, Issues 15
Number Resolved 15
7.3 Illicit Discharge Detection and Elimination
The Town's stormwater illicit discharge detection and elimination program (IDDE)
is outlined in its Illicit Discharge Detection and Elimination Plan and is enforced
through the Town code. This plan details measures that Town Stormwater and
Environmental Services Division staff follows to find and eliminate illicit discharges
and connections to the MS4. The primary components of this plan are described
below:
• MS4 Mapping
The Town maintains a GIS map and database of the stormwater infrastructure
within town limits. This includes pipes, ditches, swales catch basins, inlets,
outlets and stormwater outfalls. The Town defines stormwater outfalls more
broadly than EPA definitions. This conservative approach allows Town
Stormwater and Environmental Services Division staff to evaluate outfalls as
time allows and may eliminate some as stormwater outfalls, if appropriate.
Currently, there are approximately 123 stormwater outfalls located within the
Town's jurisdiction.
• High Priority Areas
The Town's Illicit Discharge Detection and Elimination Plan calls for the
identification of high priority areas for IDDE screening investigations. The Town
has designated four high priority areas: Downtown, Central Business District,
West Hillsborough, and Meadowlands. These areas reflect a relatively high
development density as well as a concentration of light industrial and
commercial land use.
9 Includes in-person attendees but does not include attendees that may have live streamed the meeting via
the Town's YouTube channel.
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Town of Hillsborough Stormwater Management Program
NPDES Phase II Annual Report Fiscal Year 2023
• Illicit Discharge Investigation
In general, this includes screening of high priority areas, dry weather
inspections of stormwater outfalls and investigation of complaints/concerns
submitted by citizens or by other town employees.
• Sanitary Sewer Overflows
While a sanitary sewer overflow (SSO) is ultimately the responsibility of the
Town's Utility Department, overflows can reach the stormwater system and/or
receiving waters and are considered an illegal discharge. Therefore, statistics
for SSO's are included below.
• Employee Cross-Training
An important aspect of the town's IDDE program is to provide training to other
town employees in recognizing and reporting possible illicit discharges and
connections.
FY2023 Summary statistics for the primary components of the Town's IDDE
Program are provided in the following sections.
7.3.1 Illicit Discharge Statistics
Illicit Discharge Summary— FY2023
Dry weather inspections conducted 7
Illicit discharges found 0
Illicit Discharge Illicit connections found 0
Inspections
Illicit discharges/connections resolved -
NOVs Issued 0
Number of Complaints/Investigations 9
Individual Complaints Investigations resolved 6
& Investigations
NOVs Issued 0
7.3.2 Sanitary Sewer Statistics
There were three sanitary sewer overflows in FY2023. One incident
included approximately 2,000 gallons reaching the receiving water. The
other two spills were small, approximately 200 and 300 gallons
respectively. The two small spills did reach the MS4, but not the receiving
water. All three SSOs were mitigated and reported to the state.
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Town of Hillsborough Stormwater Management Program
NPDES Phase II Annual Report Fiscal Year 2023
SSO Summary— FY2023
Number of SSO's 3
Reported to state 3
Causes identified 3
Sites repaired 3
7.3.3 Cross-Training Statistics
Due to staff time constraints, no formal training was conducted in FY2023.
Staff is currently working to record training sessions so that they can be
completed virtually. These trainings will be included as part of the "on-
boarding" process for new employees. These training modules will also be
available as updates for existing employees.
To address staff time constraints, the Stormwater and Environmental
Services Division was approved for a new Stormwater Technician position
to be hired in the second half of FY2024. This is expected to alleviate
current workload issues for existing staff.
7.4 Construction-Site Stormwater Runoff Control
Orange County implements and enforces construction site stormwater runoff
control for the Town of Hillsborough through its erosion control program. Orange
County has local delegated authority from the state to implement an erosion control
program. Legal agreements are in place allowing Orange County to enforce its
sedimentation and erosion control ordinance within the Town's jurisdiction except
for publicly funded projects, which are subject to state jurisdiction.
Active construction projects are inspected regularly by Orange County Erosion
Control staff. Inspection reports, notice of violations (NOVs) and stop work orders
are provided to Town Stormwater and Environmental Services staff. In addition,
the Town is required to conduct periodic audits/inspections of active construction
sites, including Town construction projects, to help ensure compliance. Generally,
Town Stormwater and Environmental Services Division staff typically inspect
active construction sites once a month and conduct brief site visits more frequently.
FY2023 Summary statistics for the primary components of the Town's
Construction-Site Stormwater Runoff Control Program are provided in the
following sections.
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Town of Hillsborough Stormwater Management Program
NPDES Phase II Annual Report Fiscal Year 2023
7.4.1 Erosion Control Projects Reviewed/Permitted FY2023
ECP Review Summary— FY2023
Tract Size Area
Project Name (acres) Disturbed
(acres)
Aldi-Hillsborough 3.9 3.9
Jones Street Lots 3.44 3.44
Smirnov Cabinetry 1.35 1.31
Totals 8.69 8.65
7.4.2 Erosion Control Inspection Statistics
Inspection Summary— FY2023
Active Projects Privately Owned 7
County Owned 0
State Owned 0
Town Owned Projects 0
Total 7
Inspections Conducted OCEC Staff 255
Town Staff10 21
Total 276
Enforcement Actions NOVs Issued 1
Stop Work Orders 0
Total 1
7.5 Post-Construction Stormwater Management
The Town's post-construction stormwater program includes two primary
components: new development review/approval and stormwater control measure
(SCM) inspection.
10 Town Stormwater and Environmental Services staff conduct periodic, informal inspections of active
construction sites, as well as responds to complaints regarding construction site runoff. This augments the
formal inspections completed by OCEC.
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Town of Hillsborough Stormwater Management Program
NPDES Phase II Annual Report Fiscal Year 2023
• New Development Review
Proposed development projects are reviewed to determine if the Town's
stormwater standards within the Unified Development Ordinance (UDO) are
met. Projects meeting those requirements are issued a stormwater
management plan approval. New development projects must currently meet
both the NPDES Phase II post-construction stormwater requirements and the
Falls Lake Rules nutrient loading requirements. Additionally, all SCMs must
meet the state's Minimum Design Criteria (MDCs).
• SCM Inspection Program
The Town is required to maintain an SCM inspection program pursuant to both
the NPDES Phase II regulations and the Falls Lake rules. The Town requires
the owner of each SCM to inspect at least annually and submit a report to the
Stormwater and Environmental Services Division. Additionally, the Town is
required to inspect (or what the Town staff now calls "audit") SCMs approved
through the UDO at least once every five years.
There are also SCMs within the Town's planning jurisdiction that were
approved prior to the Town's NPDES stormwater permit issued in 2005. In
March of 2013, Stormwater and Environmental Services embarked on a
program to bring all SCMs within the Town's planning jurisdiction into
compliance. This process includes conducting onsite audits of private SCMs
by Town Stormwater and Environmental Services Division staff as time and
resources allow. The intent is to exceed the audit/inspection interval required
by the NPDES and Falls Lake regulations. The goal is to complete at least a
third of SCM on site audits annually.
Town Stormwater and Environmental Services Division staff also tracks
compliance with submittal of the required annual maintenance and inspection
reports. The Town's UDO requires all SCM owners to submit their annual
inspection report by September first of each year. The Town does allow
exceptions to this requirement for specific situations. For instance, SCMs that
are completed and closed out prior to the September first deadline are often
exempted from this requirement in the first year.
Stormwater and Environmental Services began a new program in FY2018 to
recognize those SCM owners who have exceptional compliance records.
Annually in the early spring, staff evaluates SCM owner compliance and
selects a small subset of owners to be recognized. Winners are recognized via
social media, town press release, and the Stormwater Almanac publication.
They are also given a certificate signed by the mayor.
FY2023 summary statistics for the primary components of the Town's Post-
Construction Stormwater Management Program are provided in the following
sections.
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Town of Hillsborough Stormwater Management Program
NPDES Phase II Annual Report Fiscal Year 2023
7.5.1 New Development Review Statistics
Development Summary of Approved Projects— FY2023
Development Name Type Site Impervious Number
Acreage Acreage of SCMs
Hillsborough Aldi Commercial 3.75 2.25 2
Smirnov Cabinetry Commercial 1.31 0.52 1
Total 5.06 2.77 3
SCMs Approved for Development Projects — FY2023
Stormwater BMP Type Quantity
Bioretention 1
StormFilter 1
Underground Detention 1
7.5.2 SCM Inspections Statistics
SCM Onsite Audit Summary— FY2023
Number of Mapped SCMs 140
SCMs Requiring 2020 Inspection 129
Audits/Inspections Conducted 60
Maintenance Issues Identified 24
Maintenance Issues Resolved as a Result 17
Violations Noted 1
NOVs Issued 1
7.5.3 SCM Annual Maintenance Inspection Report Compliance
Annual Inspection Reports Received — FY2023
Year No. of SCMs Compliant
2013 63 13%
2014 66 47%
2015 72 71%
2016 85 73%
2017 87 76%
2018 91 78%
2019 95 87%
(continued on next page)
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Town of Hillsborough Stormwater Management Program
NPDES Phase II Annual Report Fiscal Year 2023
(continued from previous page)
Annual Inspection Reports Received — FY2023
Year No. of SCMs Compliant
2020 122 72%
2021 9311 95%
2022 122 97%
2023 129 95%
7.6 Pollution Prevention for Municipal Operations
The Town is required to develop and implement a pollution prevention program for
municipal operations. In previous years, this program was guided by the Town's
Pollution Prevention/Good Housekeeping Plan. In FY2022, as part of the annual
assessment of the Town's stormwater program staff reviewed that plan and
determined that it needed updated to better reflect NPDES permit requirements.
The result is a new operation and maintenance plan that covers town-owned
facilities, town-owned SCMs and the town's MS4.
The Town's Operation and Maintenance Plan for Stormwater Pollution Prevention
(OMP) includes seven primary components and are briefly described below.
• Inventory of Town Owned/Operated Facilities
The OMP includes all town facilities with the potential for generating
stormwater runoff pollution during town operations. The Town has developed
and maintains an inventory that includes spatial data on the location, type and
condition. The spatial information is maintained in a GIS system and is updated
at least annually.
• Inspection Program
The inspection program specifies the inspection procedures for all town
facilities addressed in the OMP. Procedures are tailored to each type of facility
and priority level. Compliance inspections are conducted at all town-owned
properties. Those identified as priority properties in the OMP are inspected
annually, while non-priority properties are inspected at least once every five
years. Priority facilities include the Wastewater Treatment Pant (WWTP),
Water Treatment Plant(WTP),the Utility Collections and Distributions yard, the
Public Works yard, and the Fleet Maintenance facility. These facilities are
typically inspected at the beginning of the fiscal year.
" Starting in FY21 the Town is reporting the number of SCMs scheduled to submit their annual inspection
report rather than total SCMs to track percent compliance. For instance, there were several SCMs
completed and closed-out in FY21 that do not require an inspection report until next year.
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Town of Hillsborough Stormwater Management Program
NPDES Phase II Annual Report Fiscal Year 2023
Town facilities containing SCMs are also inspected annually, typically in May
and June of each year. This timeframe allows a better assessment of the
vegetative components of town-owned SCMs, lawn and other landscape or
open space areas associated with town properties. Follow up inspections are
conducted to ensure maintenance work is completed.
MS4 inspections are completed by"neighborhood" and a schedule is provided
in the OMP. Supplemental MS4 inspections are conducted as part of our
routine duties and often include citizen reported concerns. Inspections results
for town-owned facilities, SCMs and MS4 are included in Section 7.61.
• Routine Maintenance
While specific maintenance items will be identified through the inspection
process described previously, the OMP also identifies pollution prevention
practices that are part of the routine maintenance of facilities. This includes
things like stabilizing areas subject to erosion, picking up loose litter and trash,
containing spills and leaks, etc. Routine maintenance covers town-owned
properties, town-maintained streets and parking lots, town-owned SCMs and
the town-owned MS4. Town staff tracks and evaluates effectiveness of regular
street sweeping, percentage of storm drains/catch basins cleaned, amount of
trash and debris removed from streets and MS4 components, the linear reet of
ditches/swales maintained, and the amount of leaves collected from streets.
• Spill Response Procedures
The Town's Spill Prevention, Control and Countermeasure Plan describes the
procedures established to respond to and prevent spills. The plan outlines
procedures for spill contingency, training, security, discharge prevention, and
evaluation of risk. The plan also provides an inventory of storage facilities and
specifies discharge and drainage controls. The Town of Hillsborough Safety
and Risk Manager developed this plan and will be responsible for updating the
plan periodically with input from facilities managers and stormwater staff.
• Pesticide, Herbicide and Fertilizer Application Management
As part of this plan, town operations include practices that minimize the use of
pesticides, herbicide, and fertilizer and ensure the proper use, handling,
storage, and disposal of these products. Stormwater pollution prevention
training workshops include an overview of practices relevant to municipal use
of pesticide, herbicide, and fertilizer. Within each department, supervisors are
responsible for ensuring that employees and contractors are properly trained
in pesticide, herbicide, and fertilizer application and all permits, certifications,
and other measures for applicators are followed. Guidelines are provided in
the OMP.
• Training
The goal of the training program is to provide staff with the resources needed
to successfully minimize or eliminate stormwater pollution during daily Town
operations. While the inspection program works directly with specific staff, the
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Town of Hillsborough Stormwater Management Program
NPDES Phase II Annual Report Fiscal Year 2023
training program is broader in scope and includes all Town staff. The program
provides a variety of training opportunities to accommodate staff needs and
availability.
• Vehicle Equipment Cleaning
The Town provides a covered vehicle wash area located at the Fleet
Maintenance Facility. The wash area consists of a concrete pad that drains to
an oil and water separator, which then drains to the sanitary sewer. A roof
covers the entire vehicle wash area. Staff who operate vehicles are instructed
to use this wash area for all vehicle and equipment cleaning. The OMP also
outlines practices related to vehicle and equipment cleaning.
Annual statistics for reportable portions of the OMP are provided in the following
sections.
7.6.1 Pollution Prevention Inspection Results
Town facilities inspected in FY2023 are listed in the following table. All high
priority facilities were inspected this year, and all low priority facilities have
been inspected at least once in the last five years. Please refer to the
Town's OMP for a list of all facilities. Follow up inspections will be
completed in the upcoming fiscal year for those listed as "Non-Compliant
or "Compliant w/Conditions."
Town Facility Pollution Prevention Inspections, Priority Facilities -
FY2023
Facility Status
Cates Creek Park Compliant
Water Tank (UNC) Compliant
Gold Park Compliant
Public Parking Compliant
Riverwalk Compliant
Wastewater Treatment Plant Compliant
Fleet Maintenance Compliant
Public Works Compliant
Water Distribution/Sewer Collections Compliant
Water Treatment Plant Non-Compliant
7.6.2 SCM Inspection Results
Town-owned SCMs and inspections results are listed in the following table.
Follow up inspections will be completed in the upcoming fiscal year for
those listed as "needs maintenance."
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Town of Hillsborough Stormwater Management Program
NPDES Phase II Annual Report Fiscal Year 2023
Town-Owned SCM Inspections — FY2023
Facility SCM Type Status
Cates Creek Bioretention Passed
Fleet Maintenance Level Spreader Passed
Underground Detention Passed
Gold Park Bioretention Passed
Stormwater Wetland Passed
Riverwalk Dry Detention Needs Maintenance
Water Tower Bioretention Passed
7.6.3 MS4 Inspection Summary
During portions of FY2023, Public Works had two open positions. Due to
this staffing shortage, no formal "neighborhood" assessments were
conducted in FY2023. The vacant positions were subsequently filled and
Public Works was approved for one additional position in FY2024. This
coupled with the Stormwater Technician position approved for the
Stormwater and Environmental Services Division in the second half of
FY2024, should allow formal MS4 inspections to resume in the next fiscal
year. Public Works staff did complete informal maintenance inspections of
the Town's MS4 based on public assistance requests and issues found by
staff completing other routine duties. Summary statistics are provided in
the following tables.
MS4 Neighborhood Assessment Completed — FY2023
Name: None in FY2023 (due to staff shortage)
Type: n/a
Streets: n/a
Condition12: n/a n/a
n/a n/a
n/a n/a
12 Percentages are approximated based on the number of MS4 assets that were assessed. Please refer to
the Town's OMP for a list of neighborhoods and fiscal year scheduled.
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Town of Hillsborough Stormwater Management Program
NPDES Phase II Annual Report Fiscal Year 2023
7.6.4 MS4 Maintenance Statistics
MS4 Maintenance/Cleaning — FY2023
Street Sweeping Linear Feet/Month 88,952
Total Linear Feet 1,067,424
Debris/Sediment Removed (tons) 52,380
Percentage of Streets Noted "dirty"13 0
Storm Drains/ Catch Basins Cleaned14 0
Catch Basins Percent Storm Drains Inspected/Cleaned15 100
Trash/Debris/Sediment Removed (pounds)16 2,000
Streets & Road Leaves Collected (tons) 675
Shoulders Loose Trash/Litter Removed (pounds) 1,500
Swales/Ditches Linear Feet Maintained17 10,379
7.6.5 Employee Training Statistics
Due to staff time constraints, no formal training was conducted in FY2023.
Staff is currently working to record training sessions so that they can be
completed virtually. These trainings will be included as part of the "on-
boarding" process for new employees. These training modules will also be
available as updates for existing employees.
To address staff time constraints, the Stormwater and Environmental
Services Division was approved for a new Stormwater Technician position
to be hired in the second half of FY2024. This is expected to alleviate
current workload issues for existing staff.
13 The Town's street sweeping contractor notes which streets each month that were notably "dirty." The
number noted represents the average percent of linear feet noted as dirty. The Town is using this
information to determine where to focus future efforts,track trends and evaluate effectiveness.
14 This number normally represents the number of catch basins that were completely cleaned using a vac
truck. Due to staff time and resource constraints, no catch basins were cleaned using the town's vac truck
in FY23. For FY24, stormwater funds were budgeted to utilize a contract service for cleaning catch basins
identified during inspections in FY24.
15 This represents the percent of storm drains that were inspected and cleaned of surface debris. This is a
preventative action that reduces the amount of debris accumulating in catch basins. These storm drains
are inspected and cleared at least monthly of debris.
16 This number is estimated by Public Works;staff are working towards tracking these amounts more exactly.
17 This may include removal of debris, removal of accumulated sediment, reshaping, revegetating, etc.
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