Stormwater Book - 2007

a
TOWN OF NEWPORT
STORMWATER MANAGEMENT PROGRAM
PUBLIC HEARING/
PUBLIC INFORMATION MEETING
APRIL 24, 2007

t

TOWN OF NEWPORT
DRAFT STORMWATER MANAGEMENT
ORDINANCE AND TECHNICAL MANUAL

STORMWATER MANAGEMENT ORDINANCE
FOR THE
TOWN OF NEWPORT, NORTH CAROLINA
January 29, 2007
Prepared By:
Holland Consulting Planners, Inc.
F3329 Wrightsville Avenue
Wilmington, North Carolina 28403
In.Cooperation With:
Municipal Engineering Services Company, P.A.
Post Office Box 828
Morehead City, North Carolina 28557

TOWN OF NEWPORT
STORMWATER MANAGEMENT ORDINANCE
TABLE OF CONTENTS
PAGE
I.
GENERAL PROVISIONS ............................................
1
(1)
Title, Purpose ...................................................
1
(2)
Authority......................................................
3
(3)
Scope of Article ..................................................
3
(4)
Applicability and Jurisdiction ..........................................
3
(5)
Interpretation...................................................
4
(6)
Definitions ......................................................
6
(7)
Permits ......................................................
10
(8)
Relationship to the Laws, Regulations, and Private Agreement ................
11
(9)
Severability..............:.....................................
12
II.
ADMINISTRATION AND PROCEDURES .................................
12
(1)
Stormwater Administrator .........................................
12
(2)
Review Procedures ..............................................
13
(3)
Applications for Approval ..........................................
16
(4)
Approvals......................................................
18
(5)
Appeals ......................................................
18
III.
STORMWATER MANAGEMENT DESIGN PLANS ............................
19
(1)
Minimum Runoff Control Requirements and Waiver of Requirements ...........
19
(2)
Stormwater Management Facilities ...................................
19
(3)
Stormwater Drainage .............................................
20
(4)
Detention and Wet Retention Facilities .................................
21
(5)
Stormwater Management Design Plan Requirements .......................
23
(6)
Town Participation ...............................................
24
(7)
Permit Requirements .............................................
24
(8)
Permit Suspension and Revocation ...................................
25
(9)
Professional Registration Requirements ................................
26
(10)
Sedimentation Pollution Control .....................................
27
(11)
Dedication of BMPs, Facilities, and Improvements .........................
27
(12)
Additional Standards for Special Situations ..............................
27
(13)
Illicit Discharges ................................................
28
IV.
MAINTENANCE .................................................
29
(1)
General Standards for Maintenance ...................................
29
(2)
Operation and Maintenance Agreement ................................
30
(3)
Inspection Program ..............................................
33
(4)
Performance Security for Installation and Maintenance .....................
33
(5)
Notice to Owners ...............................................
35
(6)
Records of Installation and Maintenance Activities ........................
35
(7)
Nuisance .....................................................
35

PAGE
(8) Maintenance Easement ........................................... 35
(9) Complaints Regarding Violations ..................................... 36
(10) Persons Liable ................................................... 36
V. MISCELLANEOUS PROVISIONS ...................................... 36
(1) Waivers for Providing Stormwater Management .......................... 36
(2) Penalties..................................................... 38
APPENDIX I STORMWATER BEST MANAGEMENT PRACTICES MANUAL

TOWN OF NEWPORT
STORMWATER MANAGEMENT ORDINANCE
I. GENERAL PROVISIONS
(1) TITLE: PURPOSE
(A) This Ordinance shall constitute and be known, and may be cited as the
"Stormwater Management Regulations of the Town of Newport, North Carolina."
(B) The purpose of this Ordinance is to protect, maintain, and enhance the public
health, safety, and general welfare by establishing minimum requirements and
procedures to control the adverse effects of increased stormwater associated with
future land development and redevelopment within the Town of Newport. Proper
management of stormwater runoff will include the following beneficial effects:
(1) will minimize damage to public and private property; (2) ensure a functional
drainage system; (3) reduce the effects of development on land and stream
channel erosion; (4) assist in the attainment and maintenance of water quality
standards; (5) reduce local flooding and drainage problems; (6) maintain as nearly
as possible the pre -developed runoff characteristics of the area; and (7) facilitate
economic development by mitigating associated flooding and drainage impacts.
(C) The application of this Ordinance and the provisions expressed herein shall be the
minimum stormwater management requirements_ and shall not be deemed a
limitation or repeal of any other obligations imposed by State statute or judicial
'decisions. The Town of Newport Stormwater Administrator or designee shall be
responsible for the coordination -and enforcement of the provisions of this
Ordinance.
(D) This ordinance seeks to meet its general purpose through the following specific
objectives and means:
1. Establishing decision -making processes for development that protect the
integrity of watersheds and preserve the health of water resources;
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Stormwater Management Ordinance Page 1

2. Requiring that new development and redevelopment maintain the pre -
development hydrologic response in their post -development state for the
applicable design storm (as defined under Section 1(6)) in order to reduce
flooding, stream bank erosion, nonpoint and point source pollution and
increases in stream temperature, and to maintain the integrity of stream
channels and aquatic habitats;
3. Establishing minimum post -development stormwater management
standards and design criteria for the regulation and control of stormwater
runoff quantity and quality;
4. Establishing design and review criteria for the construction, function, and
use of structural stormwater BMPs that may be used to meet the minimum
post -development stormwater management standards;
5. Encouraging the use of better management and site design practices, such
as the use of vegetated conveyances for stormwater and the preservation
of greenspace and other conservation areas to the maximum extent
practicable;
6. Establishing provisions for the long-term responsibility for and maintenance
of structural and nonstructural stormwater BMPs to ensure that they
continue to function as designed, are maintained appropriately, and pose
no threat to public safety;
7. Establishing administrative procedures for the submission, review,
approval, and disapproval of stormwater management plans, for the
inspection of approved projects, and to assure appropriate long-term
maintenance.
8. Controlling illicit discharges into the municipal separate stormwater
system.
9. Controlling erosion and sedimentation from construction activities.
10. Assigning responsibility and processes for approving the creation and
maintenance of adequate drainage and flood damage prevention.
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(2) AUTHORITY
The Town of Newport is authorized to adopt this Ordinance pursuant to North Carolina
law, including but not limited to Article 14, Section 5 of the Constitution of North
Carolina; the Town of Newport municipal charter; North Carolina General Statutes 143-
214.7 and rules promulgated by the Environmental Management Commission thereunder;
Session Law 2004-163; Chapter 160A, 55 174, 185; as well as Chapter 113A, Article 4
(Sedimentation Pollution Control); Article 21, Part 6 (Floodway Regulation); Chapter
160A, Article 19 (Planning and Regulation of Development); and Chapter 153A, Article 18.
(3) SCOPE OF ARTICLE
No person shall develop any land without having provided for appropriate stormwater
management measures to control or manage stormwater runoff, in compliance with this
Ordinance and NCDENR requirements, unless included in the exemptions of Section 1(4)
below.
No land owner or land operator shall receive any of the town -issued building, grading, or
other land development permits required for land disturbance activities without first
meeting the requirements of this Ordinance prior to commencing the proposed activity.
(4) APPLICABILITY AND JURISDICTION
(A) General. Beginning with and subsequent to its effective date, this ordinance shall
be applicable to all development and redevelopment, including but not limited to,
site plan applications, subdivision applications, and grading applications, unless
exempt pursuant to (B), Exemptions, below.
(B) Exemptions. The following activities may be exempt from these stormwater
performance criteria:
1. Redevelopment activities that meet the provisions of 15A NCAC
02H.1002(14).
2. Additions or modifications to existing single-family structures.
3. Residential development on a single lot with a total area of less than
10,000 square feet, provided it is not part of a larger common
development plan.
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(5)
4. Repairs to any stormwater treatment practice deemed necessary by the
Town of Newport.
(C) Map. The provisions of this Ordinance shall apply within the areas designated on
the map titled "Stormwater Map of the Town of Newport, North Carolina" ("the
Stormwater Map"), which is adopted simultaneously herewith. The Stormwater
Map and all explanatory matter contained thereon accompanies and is hereby
made a part of this Ordinance.
The Stormwater Map shall be kept on file by the Stormwater Administrator and
shall be updated as changes in Newport's planning jurisdiction occur, to take into
account changes in the land area covered by this Ordinance and the geographic
location of all structural BMPs permitted under this Ordinance. In the event of a
dispute, the applicabilityof this Ordinance to a particular parcel of land or BMP
shall be determined by reference to the North Carolina Statutes, the North
Carolina Administrative Code, and local zoning and jurisdictional boundary
ordinances.
(A) Meaning and Intent. All provisions, terms, phrases, and expressions contained
in this Ordinance shall be construed according to the general and specific purposes
set forth in Section 1(1), Purpose. If a different or more specific meaning is given
for a term defined elsewhere in the Town of Newport's code of ordinances, the
meaning and application of the term in this Ordinance shall control for purposes
of application of this Ordinance.
(B) Text Controls in Event of Conflict. In the event of a conflict or inconsistency
between the text of this Ordinance and any heading, caption, figure, illustration,
table or map, the text shall control.
(C) Authority for Interpretation. The Stormwater Administrator has authority to
determine the interpretation of this Ordinance. Any person may request an
interpretation by submitting a written request to the Administrator, who shall
respond in writing within thirty (30) days. The Administrator shall keep on file a
record of all written interpretations of this Ordinance.
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(D) References to Statutes, Regulations, and Documents. Whenever reference is
made to the Town of Newport Stormwater Management Technical Manual, it shall
be construed as a reference to the most recent edition of the NC Department of
Environmental and Natural Resources (NCDENR) Stormwater Best Management
Practices Guide (see Appendix 1) such that it has been finalized and published.
Copies of this document shall be made available at the Town of Newport Planning
and Inspections office.
(E) Computation of Time. The time in which an act is to be done shall be computed
by excluding the first day and including the last day. If a deadline or required
date of action falls on a Saturday, Sunday or holiday observed by the Town of
Newport, the deadline or required date of action shall be the next day that is not
a Saturday, Sunday or holiday observed by the Town of Newport. References to
days are calendar days unless otherwise stated.
(F) Delegation of Authority. Any act authorized by this Ordinance to be carried out
by the Stormwater Administrator of the Town of Newport may be, carried out by
his or her designee.
(G) Usage.
1. Mandatory and Discretionary Terms. The words "shall," "must," and
"will" are mandatory in nature, establishing an obligation or duty to
comply with the particular provision. The words "may" and "should" are
permissive in nature.
2. Coniunctions. Unless the context clearly indicates the contrary,
conjunctions shall be interpreted as follows: The word "and" indicates that
all connected items, conditions, provisions or events apply. The word "or"
indicates that one or more of the connected items, conditions, provisions
or events apply.
3. Tense, Plurals, and Gender. Words used in the present tense include the
future tense. Words used in the singular number include the plural
number and the plural number includes the singular number, unless the
context of the particular usage clearly indicates otherwise. Words used in
the masculine gender include the feminine gender, and vice versa.
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(H) Measurement and Computation. Lot area refers to the amount of horizontal
, land area contained inside the lot lines of a particular parcel of land.
(6) DEFINITIONS
(A) Meaning and Intent. All provisions, terms, phrases, and expressions contained
in this Ordinance shall be construed according to the general and specific purposes
set forth in Section I (1), Purpose. If a different or more specific meaning is given
for a term defined elsewhere in the Town of Newport's code of ordinances, the
meaning and application of the term in this Ordinance shall control for purposes
of application of this Ordinance.
(B) Terms Defined. When used in this ordinance, the following words and terms have
the. meaning set forth in this section, unless other provisions of this Ordinance
specifically indicate otherwise.
1. Best Management Practices. A method, activity, maintenance procedure
or combination of practices/procedures determined to be the most
practicable means of preventing or reducing, to a level compatible with
water quality goals, the amount of pollution entering a body of water.
2. Built -Upon Area (BUA). ,That portion of a development project that is
covered by impervious or partially impervious surface including, but not
limited to, buildings; pavement and gravel areas such as roads, parking
lots, and paths; and recreation facilities such as tennis courts. "Built -upon
area" does not include a wooden slatted _ deck, the water. area of a
swimming pool, or pervious or partially pervious paving material to the
extent that the paving material absorbs water or allows water to infiltrate
through the paving material.
3. Department. The North Carolina Department of Environment and Natural
Resources.
4. Design Storm. The specific frequency and, if necessary, duration of the
rainfall event to be used in design to meet the criteria established in the
Stormwater Management Plan.
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5. Detention. The collection and storage of surface water for subsequent
gradual discharge.
6. Detention Facility. A structure designed and constructed for the
. collection and storage of surface water for subsequent gradual discharge.
7.- Developed Peak Discharge Rate. The peak discharge rate, in cubic feet
per second, calculated using developed land use conditions.
8. Development. Any land disturbing activity which adds to or changes the
amount of impervious or partially pervious cover on a land area or which
otherwise decreases the infiltration of precipitation into the soil, other
than rebuilding activity that does not qualify as redevelopment.
9. Division. The Division of Water Quality in the Department.
10. High Density Proiect. Any project that exceeds the low density threshold
for dwelling units per acre and built -upon area.
11. Impervious Surface. Any material that significantly reduces and prevents
natural infiltration of water into the soil. Impervious surfaces include, but
are not limited to, roof, patios, covered balconies, covered decks, streets,
parking areas, driveways, sidewalks, and any concrete, stone, brick,.
asphalt, or compacted gravel surface.
12. Infiltration. The passage or movement of water into the soil subsurface.
13. Land Disturbing Activities. The use of land by any person that results in
a change in the natural cover or topography that may contribute to or alter
the quantity and or quality of stormwater runoff.
14. Larger Common Plan of Development or Sale. Any area where multiple
separate and distinct construction or land disturbing activities will occur
under one plan. A plan is any announcement or piece of documentation
(including but not limited to a sign, public notice or hearing, sales pitch,
advertisement, loan application, drawing, permit application, zoning
request, or computer design) or physical demarcation (including but not
limited to boundary signs, lot stakes, or surveyor markings) indicating that
construction activities may occur on a specific plot.
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15. Low Density Pro iect. For a project that is not located within one-half mile
of and draining to Shellfish Resource Waters: the project is a low -density
project if it has no more than two dwelling units per acre or twenty-four
Percent built -upon area (BUA) for all residential and non-residential
development.
For a project that is located within one-half mile of and.draining to
Shellfish Resource Waters: the project is a low -density project only if it
contains no more than twelve percent built -upon area (BUA).
A project with an overall density at or below the relevant low -density
threshold, but containing areas with a density greater than the overall
project density, may be considered low density as long as the project
meets or exceeds the post -construction model practices for low -density
projects and locates the higher density in upland areas and away from
surface waters and drainageways to the maximum extent practicable.
16. NCAC. North Carolina Administrative Code.
17. NCGS. North Carolina General Statute.
18. One-year, 24-hour Storm. The surface runoff resulting from a 24-hour
storm of an intensity expected to be equaled or exceeded, on average,
once in 12 months and with a duration of 24 hours.
19. Owner. The legal or beneficial owner. of land, including but not limited to
a mortgagee or vendee in possession, receiver, executor, trustee, or long-
term or commercial lessee, or any other person or entity holding
proprietary rights in the property or having legal power of management
and control of the property. "Owner" shall include long-term commercial
tenants; management entities, such as those charged with or engaged in
the management of properties for profit; and every person or entity having
joint ownership of the property. A secured lender not in possession of the
property does not constitute an owner, unless the secured lender is
included within the meaning of 'owner" under another description in this
definition, such as a management entity.
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20. Pervious Pavement. An alternative to conventional concrete and asphalt
paving materials that allows for infiltration of stormwater into a storage
area, with void spaces that provide temporary storage.
21. Pre -Development Conditions. Shall mean those conditions which existed
before alteration, resulting from human activity, of the natural
topography, vegetation and rate, volume or direction of surface or ground
water flow, as indicated by the best available historical data.
22. Pre -Development Peak Discharge Rate. The peak discharge rate in cubic
feet per second, calculated using land use conditions that exist prior to the
commencement of development and/or land disturbing activities.
23. Post -Development Peak Discharge Rate. The peak discharge rate in cubic
feet per second, calculated based on post development conditions.
24. Redevelopment. Shall mean the acquisition, clearance, rehabilitation, or
rebuilding of an area for residential, recreational, commercial, industrial,
or other purposes, including the provision of streets, utilities, parks,
recreational areas, or other open spaces.
25. Retention. The collection and storage of runoff without subsequent
discharge to surface waters.
26. Structural BMP. A physical device or devices designed to trap, settle out,
or filter pollutants from stormwater runoff; to alter or reduce stormwater
runoff velocity, amount, timing, or other characteristics; or to achieve any
combination of these goals for a given development. Structural BMP
includes physical practices such as constructed wetlands, vegetative
practices, filter strips, grassed swales, and other methods installed or
created on real property. "Structural BMP" is synonymous with "structural
practice", "stormwater control facility," "stormwater control practice,"
"stormwater treatment practice," "stormwater management practice,"
"stormwater control measures," "structural stormwater treatment
systems," and similar terms used in this ordinance.
27. Substantial Progress. For the purposes of determining whether sufficient
progress has been made on an approved plan, one or more of the following
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construction activities toward the completion of a site or subdivision plan
shall occur: obtaining a grading permit and conducting grading activity on
a continuous basis and not discontinued for more than thirty (30) days; or
installation and approval of on -site infrastructure; or obtaining a building
permit for the construction and approval of a building foundation.
"Substantial progress" for purposes of determining whether an approved
plan is null and void is not necessarily the same as "substantial
expenditures" used for determining vested rights pursuant to applicable
Law.
28. Technical Manual. The Town of Newport adopts through application of this
Ordinance, the NC Department of Environment and Natural Resources
(NCDENR) Stormwater Best Management Practices Guide as the town's
stormwater management technical manual (see Appendix 1). As new
versions of this manual are adopted by the State of North Carolina, the
town will review and adopt the revised manuals. Copies of the manual are
available through the town's planning and inspections department, or may
be accessed through the town's website.
29. Total Suspended Solids (TSS). A measure of the suspended solids in
wastewater, stormwater, or water bodies, determined by tests for "total
suspended non -filterable solids.
30. Water Dependent Structures. Those structures which require the access
or proximity to, or sitting within surface waters to fulfill its basic purpose,
such as boat ramps, boat houses, docks, and bulkheads. Ancillary facilities
such as restaurants, outlets for boat supplies, parking lots, and commercial
boat storage areas are not considered water -dependent structures.
(7) PERMITS
(A) Except where provided elsewhere, development shall not commence without
obtaining a Stormwater Permit pursuant to the provisions of this Ordinance.
(B) The Stormwater Permit Application shall be made by, or on behalf of, the
owner(s) or developer(s) of the site for which the permit is sought. The
application shall be filed with the Town on a form supplied by the Town and shall
be accompanied with the information identified in the Town of Newport
Stormwater Management Technical Manual.
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Stormwater Management Ordinance Page 10

(C) A Stormwater Permit shalt not be issued until the following conditions are met:
1. Approval by the Administrator of the supporting information.
2. Submission and approval of any required easements.
3. Submission and approval of any required inspection and maintenance
agreements.
4. Payment of all fees.
(D) If the development requires a Sediment and Erosion Control Permit, the
Stormwater Permit will be conditional upon the owner receiving such sediment
and erosion permit and upon the filing of a copy of the approved Sediment and
Erosion Control Plan and associated Permit to the Administrator.
(E) The Stormwater Permit will be valid for one (1) year from the date of issuance or
until significant changes in the development are made that change the intent of
the permit. Significant changes shall be determined by the Administrator. If
significant changes are made, the original Stormwater Permit shall. not be valid
and a new permit shall be required.
(8) RELATIONSHIP TO THE LAWS, REGULATIONS, AND PRIVATE AGREEMENT
(A) Conflict of Laws. This Ordinance is not intended to modify or repeal any other
ordinance, rule, regulation or other provision of law. The requirements of this
Ordinance are in addition to the requirements of any other ordinance, rules,
regulation or other provision of law, and where any provision of this Ordinance
imposes restrictions different from those imposed by any other ordinance, rule,
regulation or other provision of law, whichever provision is more restrictive or
imposes higher protective standards for human or environmental health, safety,
and welfare shall control.
(B) Private_ Agreements. This Ordinance is not intended to modify or repeal any
easement, covenant, or other private agreement. However, where the
regulations of this Ordinance are more restrictive or impose higher standards or
requirements than such easement, covenant, or other private agreement, then
the requirements of this Ordinance shall govern. Nothing in this Ordinance shall
modify or repeat any private covenant or deed restriction, but such covenant or
restriction shall not legitimize any failure to comply with this Ordinance. In no
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case shall the Town of Newport be obligated to enforce the provisions of any
easements, covenants, or agreements between private parties.
(C) Regulatory Consistency. This Ordinance shall be construed to assure consistency
with the requirements of the NCDENR Universal Stormwater Management Program
(USMP) and acts amendatory thereof or supplementary thereto, or any applicable
implementing regulations.
(9) SEVERABILITY
If the provisions of any section, subsection, paragraph, subdivision or clause of this
Ordinance shall be adjudged invalid by a court of competent jurisdiction, such judgment
shall not affect or invalidate the remainder of any section, subsection, paragraph,
subdivision or clause of this Ordinance.
II. ADMINISTRATION AND PROCEDURES
(1) STORMWATER ADMINISTRATOR
(A) - Designation. A Stormwater Administrator shall be designated by the Town of
Newport to administer and enforce this Ordinance.
(B) Powers and Duties. In addition to the powers and duties that may be conferred
,by other provisions of the Town of Newport municipal code and other laws, the
Stormwater Administrator shall have the following powers and duties under this
Ordinance:
1. To review and approve, approve with conditions, or disapprove
applications for approval of plans pursuant to this Ordinance.
2. To make determinations and render interpretations of this Ordinance.
3. To establish application requirements and schedules for submittal and
review of applications and appeals, to review and make recommendations
to the Town Council about applications for development and
redevelopment approvals.
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4. To enforce the provisions of this Ordinance in accordance with its
enforcement provisions.
5. To maintain records, maps, and official materials as relate to the
adoption, amendment, enforcement, or administration of this Ordinance.
6. To provide expertise and technical assistance to the Town Council, and if
a stormwater board is established; to the chairman of that board, upon
request.
7. To designate appropriate other person(s) who shall carry out the powers
and duties of the Stormwater Administrator.
8. To take any other action necessary to administer the provisions of this
Ordinance.
(2) REVIEW PROCEDURES
(A) Permit Required; Must Apply for Permit. A stormwater permit is required for
all development and redevelopment unless exempt pursuant to Section 1(4)(B) of
this Ordinance. A permit may only be issued subsequent toa properly submitted
and reviewed permit application, pursuant to this section.
(B) Effect of Permit. A stormwater permit shall govern the design, installation, and
construction of stormwater management and control practices on the site,
including structural BMPs and other elements of -site design for stormwater
management.
The permit is intended to provide a mechanism for the review, approval, and
inspection of the approach to be used for the management and control of
stormwater for the development or redevelopment site, whether the approach
consists of structural BMPs or other techniques such as a low -density design. The
permit does not continue in existence indefinitely after the completion of the
project; rather, compliance after project construction is assured by the
maintenance provisions of this Ordinance.
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(C) Authority to File Applications. All applications required pursuant to this
Ordinance shall be submitted to the Stormwater Administrator by the owner or the
owner's duly authorized agent.
(D) Establishment of Application Requirements, Schedule, and Fees
1. Application Contents and Form. The Stormwater Administrator, in
conjunction with the Stormwater Advisory Board, shall establish
requirements for the content and form of all applications and shall amend
and update those requirements from time to time. At a minimum, the
stormwater permit application shall describe in detail how post -
development stormwater runoff will be controlled and managed, the
design of all stormwater facilities and practices, and how the proposed
project will meet the requirements of this Ordinance.
2. Submission Schedule. The Stormwater Administrator, in conjunction with
the,Stormwater Advisory Board, shall establish a submission schedule for .
applications. The schedule shall establish deadlines by which complete
applications must be submitted for the purpose of ensuring that there is
adequate time to review applications, and that the various stages in the
review process are accommodated.
3. Permit Review Fees. The Newport Town Council shall establish permit
review fees as well as policies regarding refund of any fees upon
withdrawal of an application, and may amend and update the fees and
policies from time to time.
4. Administrative Manual. For applications required under this Ordinance,
the Stormwater Administrator shall compile the application requirements,
submission schedule, fee schedule, a copy of this Ordinance, and
information on how and where to obtain the Town of Newport Stormwater
Management Technical Manual in a Stormwater Management Plan
Administrative Manual, which shall be made available to the public.
(E) Submittal of Complete -Application. Applications shall be submitted to the
Stormwater Administrator pursuant to the application submittal schedule form
established by the Stormwater Administrator, along with the appropriate fee
established pursuant to this section.
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An application shall be considered as timely submitted only when it contains all
elements of a complete application pursuant to this Ordinance, along with the
appropriate fee. If the Stormwater Administrator finds that an application is
incomplete, the applicant shall be notified of the deficient elements and shall be
provided with an opportunity to submit a complete application. However, the
submittal of an incomplete application shall not suffice to meet a deadline
contained in the submission schedule established above.
(F) Review. Within thirty (30) working days after a complete application is
submitted, the Stormwater Administrator shall review the application and
determine whether the application complies with the standards of this Ordinance.
1. Approval. If the Stormwater Administrator finds that the application
complies with the standards of this Ordinance, the Stormwater
Administrator shall approve the application. The Stormwater
Administrator may impose conditions of approval as needed to ensure
compliance with this Ordinance. The conditions shall be included as part
of the approval.
2. Fails to Comply. If the Stormwater Administrator finds that the
application fails to comply with the standards of this Ordinance, the
Stormwater Administrator shall notify the applicant and shall indicate how
the application fails to comply. The applicant shall have an opportunity
to submit a revised application.
3. -Revisions and Subsequent Review. A complete revised application shall be
reviewed by the Stormwater Administrator within thirty (30) working days
after its resubmittal and shall be approved, approved with conditions or
disapproved.
If a revised application is not resubmitted within thirty (30) calendar days
from the date the applicant was notified, the application shall be
considered withdrawn, and a new submittal for the same or substantially
the same project shall be required with the appropriate fee.
One resubmittal of a revised application may be submitted without
payment of an additional permit review fee. Any resubmittal after the
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first resubmittal shall be accompanied by a permit review fee additional
fee, as established pursuant to this Ordinance.
(3) APPLICATIONS FOR APPROVAL
(A) Concept Plan and Consultation Meeting. Before a stormwater management
permit application is deemed complete, the Stormwater Administrator or owner
may request a consultation on a concept plan for the post -construction
stormwater management system to be utilized in the proposed development
project. This consultation meeting should take place in conjunction with the
review of the preliminary subdivision plans or other early step in the development
process. The purpose of this meeting is to discuss the post -construction
stormwater management measures necessary for the proposed project, as well as
to discuss and assess constraints, opportunities, and potential approaches to
stormwater management designs before formal site design engineering is
commenced. Other relevant resource protection plans may be consulted in the
discussion of the concept plan. The following information should be included in
the concept plan, which should be submitted at least 15 days in advance of the
meeting.
1. Existing Conditions/Proposed Site Plans. Existing conditions and proposed
site layout sketch plans, which illustrate at a minimum: existing and
proposed topography; perennial and intermittent streams; mapping of
predominant soils from soil surveys; boundaries of existing predominant
vegetation and proposed limits of clearing and grading; and location of
existing and proposed roads, buildings, parking areas, and otherimpervious
surfaces.
2. Natural Resources Invent ory. A written or graphic inventory of the natural
resources at the site and surrounding area as it exists period to the
commencement of the project. This description should include a
discussion of soil conditions, forest cover, geologic features, topography,
wetlands, and native vegetative areas on the site, as well as the location
and boundaries of other natural feature protection and conservation areas
such as lakes, ponds, floodplains, stream buffers, and other setbacks (e.g.,
drinking water well setbacks, septic setbacks, etc.). Particular attention
should be paid to environmentally sensitive features that provide
particular opportunities or constraints for development.
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Stormwater Management Ordinance Page 16

3. Stormwater Management System Concept Plan. A written or graphic
concept plan of the proposed post -development stormwater management
system including: preliminary selection and location of proposed structural
stormwater controls; low impact design elements; location of existing and
proposed conveyance systems such as grass channels, swales, and storm
drains; flow paths; location of floodplain/floodway limits; relationship of
site to upstream and downstream properties and drainages; and
preliminary location of proposed stream channel modifications, such as
bridge or culvert crossings.
(B) Stormwater Management Permit Application. The stormwater management
permit application shall detail how post -development stormwater runoff will be
controlled and managed, and how the proposed project will meet the
requirements of this Ordinance, including Section III, Design Plans. All such plans
shall be prepared by a qualified registered North Carolina professional engineer,
surveyor, soil scientist or landscape architect. The designing engineer; surveyor,
soil scientist or landscape architect shall perform services only in their area of
competence, and shall verify that the design of all stormwater management
facilities and practices meets the submittal requirements for complete
applications, that the designs and plans are sufficient to comply with applicable
standards and policies found in the Town of Newport Stormwater Management
Technical Manual, and that the designs and plans ensure compliance with this
Ordinance. The submittal shall include all of the information required in the
submittal checklist established by the Stormwater Administrator. Incomplete
submittals shall be treated pursuant to II(2)(E).
(C) . As -Built Plans and Final Approval. Upon completion of a project, and before a
certificate of occupancy shall be granted, the owner shall certify that the
completed project is in accordance with the approved stormwater management
plans and designs, and shall submit actual "as -built" plans for all stormwater
management facilities or practices after final construction is completed.
The plans shall show the final design specifications for all stormwater
management facilities and practices and the field location, size, depth, and
planted vegetation of all measures, controls, and devices, as installed. The
designing engineer of the stormwater management measures and plans shall
certify, under seal, that the as -built stormwater measures, controls, and devices
are in compliance with the approved stormwater management plans and designs.
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Stormwater Management Ordinance Page 17

A final inspection and approval by the Stormwater Administrator shall occur
before the release of any performance securities.
(D) Other Permits. No certificate of occupancy shall be issued by the Building
Inspector without final as -built plans and a final inspection and approval by the
Stormwater Administrator, except where multiple units are served by the
stormwater practice or facilities, in which case the Building Inspector may elect
to withhold a percentage of permits or certificates of occupancy until as -built
plans are submitted and final inspection and approval has occurred.
(4) APPROVALS
(A) Effect of Approval. Approval authorizes the applicant to go forward with only
the specific plans and activity authorized in the permit. The approval shall not
be construed to exempt the applicant from obtaining other applicable approvals
from local, state, and federal authorities.
(B) Time Limit/Expiration. An approved plan shall become null and void if the
applicant has failed to make substantial progress on the site within one (1) year
after the date of approval. The Stormwater Administrator may grant a single,
one-year extension of this time limit, for good cause shown, upon receiving a
written request from the applicant before the expiration of the approved plan.
In granting an extension, the Stormwater Administrator may require compliance
with standards adopted since the original application was submitted.
(5) APPEALS
(A) Right of Appeal. Any aggrieved person affected by any decision, order,
requirement, or determination relating to the interpretation or application of this
Ordinance and made by the Stormwater Administrator may file an appeal to the
Town of Newport Board of Adjustment within thirty (30) days from the date that
the original application was denied approval. If the appeal is in relation to an
interpretation or requirement of this Ordinance, the owner shall comply with the
existing Town of Newport Board of Adjustment procedures.
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Stormwater Management Ordinance Page 18

(B) Filing of Appeal and Procedures. Appeals shall be in writing and made on forms
provided by the town. The appellant shall specify within the forms the decision,
order, requirement, or determination which he believes to be in error along with
the reason(s) for this belief.
Upon receipt of a properly prepared appeal, the Stormwater Administrator shall
forthwith transmit to the Board of Adjustment all record documents relating to
the decision, order, requirement or determination being appealed.
III. STORMWATER MANAGEMENT DESIGN PLANS
(1) MINIMUM RUNOFF CONTROL REQUIREMENTS AND WAIVER OF REQUIREMENTS
The minimum stormwater control requirements shall provide measures necessary to
control velocities of flow from stormwater management facilities to a level which will
comply with the NCDENR Universal Stormwater Management Program (USMP) outlined
within North Carolina Administrative Code Section 15A NCAC 02H.1020, Stormwater
Management.
The design of these facilities shall be based on procedures contained in the Town of
Newport Stormwater Management Technical Manual or alternate procedures approved by
the Town of Newport.
(2) STORMWATER MANAGEMENT FACILITIES
(A) Stormwater management facilities may include both structural and nonstructural
elements as outlined within the Town of Newport Stormwater Management
Technical Manual. Natural swales and other natural runoff conduits shall be
retained where practicable.
(B) Where stormwater management facilities are required to satisfy the minimum
control requirements, the following measures are examples of what may be used.
Stormwater detention facilities (wet/dry ponds).
2. Facilities designed to encourage overland flow, slow velocities of flow, and
flow through buffer zones.
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Stormwater Management Ordinance Page 19

3. On -site infiltration practices used to control runoff from small areas.
4. Reduction of impervious surfaces directly connected to the drainage
system.
5. Other methods acceptable to the Town of Newport which assure no harm
to downstream properties.
(C) The stormwater management facilities within the Town (including both public and
private facilities) will be designed to the same engineering and technical criteria
and standards. The Town's review will be the same whether the facilities will be
under public or private control or ownership.
(Dj All stormwater management facilities shall be designed using the design criteria
contained in the Town of Newport Stormwater Management Technical Manual, or
other alternate procedures approved by the Town of Newport, whichever is more
strict.
(3) STORMWATER DRAINAGE
The owner shall provide an adequate drainage system for the proper drainage of all
surface water. The design of such a system shall be subject to the approval of the
Stormwater Administrator.
(A) No surface water shall be channeled or directed into a sanitary sewer.
(B) Where feasible, provided all requirements herein are met, the owner may connect
to an existing storm drainage system.
(C) Where an existing storm drainage system cannot feasibly be extended to the
proposed project, a surface drainage system shall be designed to protect the
proposed development from water damage.
(D) Surface drainage courses shall have side slopes no steeper than three (3) feet of
horizontal distance for each one (1) foot of vertical distance, and courses shall be
of sufficient size to accommodate the drainage area without flooding, and
designed to comply with the current State of North Carolina standards and
specifications for erosion control, and any locally adopted erosion and
sedimentation control ordinances.
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Stormwater-Management Ordinance Page 20

I,.
(E) Unless necessitated by exceptional topography, and subject to the approval of the
Planning Board, street grades shall be not more than eight (8) percent nor less
than one-half of one (0.5) percent. Grades approaching intersections shall not
exceed five (5) percent for a distance of not less than one hundred (100) feet
from the centerline of said intersection.
(F) Stream banks and channels downstream from any land disturbing activity shall be
protected from increased degradation by accelerated erosion caused by increased
velocity of runoff from the land disturbing activity in accordance with current
State of North Carolina sedimentation pollution control requirements.
(G) Anyone constructing a dam or impoundment within the subdivision must comply
with current State of North Carolina dam construction standards.
(H) In all areas of special flood hazards, all subdivision proposals shall have adequate
drainage provided to reduce exposure to flood damage.
(4) DETENTION AND WET RETENTION FACILITIES
The Town encourages the use of innovative techniques and designs which will provide the
necessary' protection for the receiving watercourse. All proposed stormwater
management systems are required to control the runoff resulting from the first one and
one-half inch of rainfall. Additionally, structural stormwater controls shall meet the
following criteria:
(A) Remove an 85% average annual amount of Total Suspended Solids (TSS).
(B) Detention ponds should draw down the treatment volume no faster than 48 hours,
but no slower than 120 hours.
(C) Discharge the storage volume at a rate equal to or less than the pre -development
discharge rate for the 1-year, 24-hour storm.
(D) Meet the General Engineering Design criteria set forth in 15A NCAC 02H.1008(c).
In addition to the criteria outlined above, all impervious surfaces, except for roads,
paths, and water dependant structures shall be located at least thirty (30) feet landward
of all perennial and intermittent surface waters.
Town of Newport
Stormwater Management Ordinance Page 21

Detailed drawings, substantiating data, calculations, and specifications shall be submitted
for designs of this nature. The use of ponds have been utilized most frequently for
stormwater control and, therefore, design standards and procedures for this approach
have been included in the Town of Newport Stormwater Management Technical Manual.
However, the Town suggests that the owner incorporate stormwater controls into the
overall site as an amenity and/or visual enhancement. Within areas zoned for
commercial or multi -family uses (refer to the Town of Newport Zoning Ordinance for the
determination of where commercial and multi -family uses are permitted), detention or
retention pond facilities shall be required. The following are minimum requirements for
detention/retention facilities:
(A) Slopes. Side slopes where vegetation is used for stabilization shall be 2.5
(horizontal) to 1 (vertical) or flatter. The side slopes should be no steeper than
3 to 1 where mowing will be necessary. Where the side slopes are protected with
riprap, fabric form, or other approved armoring, side slopes of 2 to 1 may be
permitted provided that it can be demonstrated through calculations or other
means acceptable to the Stormwater Administrator that the armoring proposed
will protect the slopes from erosion. Steeper slopes may be approved by the Town
on a case -by -case basis.
(B) Vegetation. Vegetation for stabilization of side slopes shall be a hearty ground
cover that has been designated as a native species for the Town of Newport. A
listing of native plant species is available through the Stormwater Administrator.
The designer shall consult the Stormwater Administrator regarding landscape
standards such as selection, spacing, location,.and planting requirements of all... ._
grasses and plants which are to be incorporated in the system. Approval of a
Landscaping plan by the Stormwater Administrator will be required as part of the
stormwater permit approval process.
(C) Risers. Risers shall be a minimum of twelve (12) inches in diameter and pipes
shall be a minimum of twelve (12) inches in diameter to reduce the potential for
clogging the outlet system. A trash rack with 4-inch maximum openings shall be
provided to avoid pipe clogging. The design shall include consideration of anti -
vortex measures where deemed necessary for stability of the outlet structure.
Town of Newport
Stormwater Management Ordinance Page 22

(D) Drain. The design of all detention or retention facilities should incorporate a
method of draining all water by use of a valve assembly. Where this is determined
not possible, a well defined low point shall be constructed to allow for pumping
out the facility.
(E) Overflow. An emergency outlet or overflow designed for the 100-year storm shall
be provided for all detention/retention facilities.
(F) Other Utilities. No other utilities shall be constructed within five (5) feet of
stormwater detention/retention ponds unless specifically approved by the Town.
(G) Landscaping. Open basins shall be provided with a minimum 5-foot wide
landscaped zone around the periphery of the ponds which have a surface area up
to 0.5 acres as measured at the top bank. A minimum 10-foot wide landscaped
zone as measured outward from the top of the bank shall be provided for ponds
larger than 0.5 acres.
(H) Access. A stable access and maintenance shoulder with a minimum width of ten
(10) feet measured from the top of bank shall be provided, sufficient to allow the
periodic removal of sediment from the system. This access shall be coordinated
with the landscaping zone around the basin. The landscaping zone shall not be
incorporated into the access/maintenance way.
(1) Fencing. Fencing for private facilities shall be at the option of the developer.
(5) STORMWATER MANAGEMENT DESIGN PLAN REQUIREMENTS
Stormwater management design plans shall include the following:
(A) A determination that no proposed stormwater management facility will create
- flooding or drainage problems for the 25- and 100-year flood events.
(B) Stormwater management design plans shall clearly show all easements needed for
inspection and maintenance of the stormwater management facilities. The
easement location(s) shall be approved by the Stormwater Administrator. The
easement(s) shall be recorded subsequent to approval by the Administrator. A
copy of the recorded easement(s) shall be provided to the Administrator.
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Stormwater Management Ordinance Page 23

(C) A plan for maintenance of all stormwater management facilities shall be included
as part of the stormwater management design plan. Maintenance must be the
responsibility of the developer, and ultimately, the development owners or
homeowners' association. The maintenance plan should be signed and notarized
by the owner, and a copy provided to the Town Stormwater Administrator.
(6) TOWN PARTICIPATION
When the Town of Newport determines that additional storage capacity beyond that
required by the applicant for on -site stormwater management is desirable to correct
unacceptable or undesirable existing conditions or to provide protection in a more
desirable fashion for future development, the Town, with approval from Town Council,
may:
(A) Develop an agreement with the applicant to enlarge the required stormwater
. management infrastructure, and
(B) Participate financially in the construction of such infrastructure to the extent that
such an infrastructure exceeds the required on -site stormwater management
required of this Ordinance.
(7) PERMIT REQUIREMENTS
No building or zoning permits for improvements or plat recordation for a subdivision, for
which a stormwater management plan is required, shall be approved or modified by the
Town without the approval of the following stormwater management regulatory items.
(A) Right of entry for emergency maintenance.
(B) Any recorded off -site easements needed.
(C) An, approved stormwater management design plan.
(D) A maintenance agreement.
(E) Recorded easements for stormwater management facilities.
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Stormwater Management Ordinance Page 24

(8) PERMIT SUSPENSION AND REVOCATION
(A) Notice of Violation. When the Town determines that an activity is not being
carried out in accordance with the requirements of this Ordinance, it shall issue
a written notice of violation to the owner of the property. The notice of violation
shall contain:
1. The name and address of the owner or applicant.
2. The address when available or a description of the building, structure, or
land upon which the violation is occurring.
3. A statement specifying the nature of the violation.
4. A description of the remedial measures necessary to bring the
development activity into compliance with this Ordinance and a deadline
for the completion of such remedial action.
5. A statement of the penalty or penalties that shall or may be assessed
against the person to whom the notice of violation is directed.
6. A statement that the determination of violation may be appealed to the
Town by filing a written notice of appeal within fifteen (15) days of service
of notice of violation.
(B) Stop Work Orders. Persons receiving a notice of violation will be required to halt .
all construction activities. This "stop work order" will be in effect until the Town
confirms that the development activity is in compliance and the violation has been
satisfactorily addressed. Failure to address a notice of violation in a timely
manner can result in civil, criminal, or monetary penalties in accordance with the
enforcement measures authorized in this Ordinance.
(C) Restoration of Lands. Any violator may be required to restore land to its
undisturbed condition. In the event that restoration is not undertaken within a
reasonable time after notice, the Town may take necessary corrective action, the
cost of which shall become a lien upon the property until paid.
Town of Newport
Stormwater Management Ordinance Page 25

(D) Holds on Occupation Permits. Occupation permits will not be granted until
corrections to all stormwater practices have been made and accepted by the
Town.
(E) Failure to Maintain Practices. If a responsible party fails or refuses to meet the
requirements of the maintenance covenant, the Town, after reasonable notice,
may correct! a violation of the design standards or maintenance needs by
i
performing all necessary work to place the facility in proper working condition.
In the event that the stormwater management facility becomes a danger to public
safety or public health, the Town shall notify the party responsible for
maintenance of the stormwater management facility in writing. Upon receipt of
that notice, !the responsible person shall have twenty (20) days to effect
maintenance !and repair of the facility in an approved manner. After proper
notice, the Town may assess the owner(s) of the facility for the cost of repair
work and any penalties; and the cost of the work shall be a lien on the property,
or prorated against the beneficial users of the property, and may be placed on the
owner's annual tax bill.
If it is determined that the condition is immediately dangerous to public safety or
health, the Town will immediately contact the owner and then address all
corrective actions required to mitigate danger to public safety, health, and
property. The cost of any required corrective action will be the responsibility of
the owner. I
(9) PROFESSIONAL REGISTRATION REQUIREMENTS
I
Stormwater management design plans that are incidental to the design of a residential
subdivision shall be prepared by a qualified registered North Carolina Professional
Engineer, Surveyor, or Landscape Architect, using acceptable engineering standards and
practices. All other stormwater management design plans shall be prepared by a
qualified registered North Carolina Professional Engineer, using acceptable engineering
standards and practices.
The engineer, surveyor, or landscape architect shall perform services only in areas of
his/her competence, shall undertake to perform engineering, landscape architecture, or
land surveying assignments only when qualified by education and/or experience in the
specific technical field.
Town of Newport
Stormwater Management Ordinance Page 26

(10) SEDIMENTATION POLLUTION CONTROL
In order to prevent soil erosion and sedimentation pollution of streams, springs, flat water
bodies, or other drainage networks, the owner shall comply with all requirements of the
State of North Carolina sedimentation pollution control requirements or any locally
adopted sediment control ordinances.
(11) DEDICATION OF BMPs, FACILITIES, AND IMPROVEMENTS
The Town of Newport may accept dedication of any existing or future stormwater
management facility for maintenance, provided such facility meets all the requirements
of this Ordinance and includes adequate and perpetual access and sufficient area, by
easement or otherwise, for inspection and regular maintenance.
(12) ADDITIONAL STANDARDS FOR SPECIAL SITUATIONS
(A) SA Waters. In addition to the standards for stormwater handling set out within
Section 111(1) of this Ordinance, development and redevelopment involving land
area in excess of 10,000 square feet which drains to and is located within one-half
mile (2,640 feet) of SA waters shall incorporate the following measures into their
stormwater management system design:
Fecal Coliform. Use stormwater control -measures that result in fecal
coliform die off and that control to the maximum extent practicable
sources of fecal coliform while incorporating requirements specified under
- provision III(1) of this Ordinance.
2. Restrictions on Pet Waste.
a. It shall be unlawful for the owner or custodian of any dog to take
it off the owner's property limits without the means to properly
remove and dispose of the dog's feces from any public or private
property.
b. It is the responsibility of a dog's owner or custodian to clean up the
dog's feces from any public or private property outside of the dog
owner's own property limits. Such property includes, but is not
limited to, parks, rights -of -way, paths, and public access areas.
Town of Newport
Stormwater Management Ordinance Page 27

C. "Means to properly remove and dispose of feces" shall consist of
having on or near one's person a device such as a plastic bag, or
other suitable plastic or paper container, that can be used to clean
up and contain dog waste until it can be disposed of in an
appropriate container. Such a device must be produced and
shown, upon request, to anyone authorized to enforce these
Ordinances.
- d. This provision shall not apply to handicapped persons assisted by
trained guide or assistance dogs.
e. "Public nuisance" is defined to include "a dog which deposits feces
on public property or on private property without the consent of
the owner or person in lawful possession of the private property,
and the person owning, possessing, harboring or having the care,
charge, control or custody of the dog fails to remove the feces so
deposited". Provided, however, this definition shall not apply to
any dog assisting a handicapped person.
(3) No Direct Discharge or Expansion of Discharges to SA Waters. No new
direct points of stormwater discharge to SA waters or expansion of existing
points of discharge to any constructed stormwater conveyance systems, or
constructed system of conveyances that discharge to SA waters, shall be
permitted. "Expansion," for purposes of this section, means an increase
in drainage area or an increase in impervious surface within the drainage
area resulting in a net increase in peak flow or.volume.,.
(B) Shellfishing Waters. All development and redevelopment activities that are
located within 575 feet of waters designated as Shellfishing waters shall be limited
to a maximum impervious surface ,density of 36%. Shellfishing waters are
designated by the NC Environmental Management Commission.
(13) ILLICIT DISCHARGES
No person shall cause or allow the discharge, emission, disposal, pouring, or pumping
directly or indirectly to any stormwater conveyance, the waters of the State, or upon the
land in a manner and amount that the substance is likely to reach a stormwater
conveyance or the waters of the State, any liquid, solid, gas, or other substance, other
Town of Newport ,
Stormwater Management Ordinance Page 28

than stormwater; except that non-stormwater discharges associated with the following
activities are allowed and provided that they do not significantly impact water quality:
(A) Water line flushing
(B) Landscape irrigation
(C) Diverted stream flows
(D) Rising ground waters
(E) Uncontaminated ground water infiltration (as defined at 40 CFR 35.200(20))
(F) Uncontaminated pumped ground water
(G) Discharges from potable water sources
(H) Foundation drains
(1) Air conditioning condensation
(J) Irrigation water
(K) Springs
(L) Water from crawl space pumps
(M) Footing drains
(N) Lawn watering
(0) Individual residential car washing
(P) Flows from riparian habitats and wetlands
(Q) Dechlorinated swimming pool discharges
(R) Street wash water, and
(S) Other non-stormwater discharges for which a valid NPDES discharge permit has
been approved and issued by the State of North Carolina, and provided that any
such discharges to the municipal separate storm system shall be authorized by the
Town of Newport.
Prohibited substances include but are not limited to: oil, anti -freeze, chemicals, animal
waste, paints, garbage, and litter.
IV. MAINTENANCE
(1) GENERAL STANDARDS FOR MAINTENANCE
(A) Function of BMPs As, Intended. The owner of each structural BMP installed
pursuant to this Ordinance shall maintain and operate it so as to preserve and
continue its function in controlling stormwater quality and quantity at the degree
or amount of function for which the structural BMP was designed.
Town of Newport
Stormwater Management Ordinance Page 19

(B) Annual Maintenance Inspection and Report. The person responsible for
maintenance of any structural BMP installed pursuant to this Ordinance shall
submit to the Stormwater Administrator an inspection report from a qualified
registered North Carolina professional engineer, surveyor, or landscape architect
performing services only in their area of competence. The inspection report shall
contain all of the following:
1. The name and address of the land owner;
2. The recorded book and page number of the lot of each structural BMP;
3. A statement that an inspection was made of all structural BMPs;
4. The date the inspection was made;
5. A statement that all inspected structural BMPs are performing properly and
are in compliance with the terms and conditions of the .approved
maintenance agreement required by this ordinance. If it is determined
that a system is not performing properly, then a schedule should be
included with the report outlining when and how required improvements
will be addressed; and
6. The original signature and seal of the engineer, surveyor, or landscape
architect.
All inspection reports shall be on forms supplied by the Stormwater Administrator.
An original inspection report shall be provided to the Stormwater Administrator
beginning one year from the date of as -built certification and each year thereafter
on or before the date of the as -built certification.
(2) OPERATION AND MAINTENANCE AGREEMENT
(A) In General. Prior to the conveyance or transfer of any lot or building site to be
served by a structural BMP pursuant to this ordinance, and prior to issuance of any
permit for development or redevelopment requiring a structural BMP pursuant to
this ordinance, the applicant or owner of the site must execute an operation and
maintenance agreement that shall be binding on all subsequent owners of the site,
portions of the site, and lots or parcels served by the structural BMP. Until the
transference of all property, sites, or lots served by the structural BMP, the
original owner or applicant shall have primary responsibility for carrying out the
provisions of the maintenance agreement.
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Stormwater Management Ordinance Page 30

The operation and maintenance agreement shall require the owner or owners to
maintain, repair and, if necessary, reconstruct the structural BMP, and shall state
the terms, conditions, and schedule of maintenance for the structural BMP. In
addition, it shall grant to the Town a right of entry in the event that the
Stormwater Administrator has reason to believe it has become necessary to
inspect, monitor, maintain, repair, or reconstruct the structural BMP; however,
in no case shall the right of entry, of itself, confer an obligation on the Town of
Newport to assume responsibility for the structural BMP.
The operation and maintenance agreement must be approved by the Stormwater
Administrator prior to plan approval, and it shall be referenced on the final plat
and shall be recorded with the county Register of Deeds prior to final plat
approval. A copy of the recorded maintenance agreement shall be given to the
Stormwater Administrator within fourteen (14) days following its recordation.
(B) Special Requirement for Homeowners' and Other Associations. For all
structural BMPs required pursuant to this ordinance and that are to be or are
owned and maintained by a homeowners' association, property owners'
association, or similar entity, the required operation and maintenance agreement
shall include:
1. Acknowledgment that the association shall continuously operate and
maintain the stormwater control and management facilities.
2. A statement granting to the Town of Newport a right of entry to inspect,
monitor, maintain, repair, and reconstruct structural BMPs.
3. A statement that acknowledges the right of the Town of Newport to
recover from the association and its members any and all costs the Town
expends to maintain or repair the structural BMPs or to correct any
operational deficiencies. Failure to pay the Town all of its expended
costs, after forty-five days written notice, shall constitute a breach of the
agreement. The Town of Newport shall thereafter be entitled to bring an
action against the association and its members to pay, or foreclose upon
the lien hereby authorized by the agreement against the property, or both,
in case of a deficiency. Interest, collection costs, and attorney fees shall
be added to the recovery.
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Stormwater Management Ordinance Page 31

4. A statement that the agreement shall not obligate the Town of Newport
to maintain or repair any structural BMPs, and the Town of Newport shall
not be liable to any person for the condition or operation of structural
BMPs.
5. A statement that the agreement shall not in any way diminish, limit, or
restrict the right of the Town of Newport to enforce any of its ordinances
as authorized by law.
6. A provision indemnifying and holding harmless the Town of Newport for
any costs and injuries arising from or related to the structural BMP, unless
the Town has agreed in writing to assume the maintenance responsibility
for the BMP and has accepted dedication of any and all rights necessary to
carry out that maintenance.
Additionally, all Property Owners Associations and Homeowner Associations shall
establish an escrow account to ensure maintenance of the system. The following
outlines the procedures for establishment of this account:
1. The escrow account, which can be spent solely for sediment removal,
structural, biological or vegetative replacement, major repair, or
reconstruction of the structural BMPs. If structural BMPs are not
performing adequately or as intended or are not properly maintained, the
Town of Newport, in its sole discretion, may remedy the situation, and in
such instances the Town shall be fully reimbursed from the escrow
account.
2. Both developer contribution and annual sinking funds shall fund the escrow
account. Prior to plat recordation or issuance of construction permits,
whichever shall first occur, the developer shall pay into the escrow
account an amount equal to fifteen (15) per cent of the initial construction
cost of the structural BMPs. Two-thirds (2/3) of the total amount of
sinking fund budget shall be deposited into the escrow account within the
first five (5) years and the full amount shall be deposited within ten (10)
years following initial construction of the structural BMPs. Funds shall be
deposited each year into the escrow account: A portion of the annual
assessments of the association shall include an allocation into the escrow
account. Any funds drawn .down from the escrow account shall be
replaced in accordance with the schedule of anticipated work used to
create the sinking fund budget.
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Stormwater Management Ordinance Page 32

3. The percent of developer contribution and lengths of time to fund the
escrow account may be varied by the Town of Newport depending on the
design and materials of the stormwater control and management facility.
(3) INSPECTION PROGRAM
Inspections and inspection programs by the Town of Newport may be conducted or
established on any reasonable basis, including but not limited to routine inspections;
random inspections; inspections based upon complaints or other notice of possible
violations; and joint inspections with other agencies inspecting under environmental or
safety laws. Inspections may include, but are not limited to, reviewing maintenance and
repair records; sampling discharges, surface water, groundwater, and material or water
in BMPs; and evaluating the condition of BMPs.
If the owner or occupant of any property refuses to permit such inspection, the
Stormwater Administrator may proceed to obtain an administrative search warrant
pursuant to G.S. 15-27.2 or its successor. No person shall obstruct, hamper or interfere
with the Stormwater Administrator while carrying out his or her official duties.
(4) PERFORMANCE SECURITY FOR INSTALLATION AND MAINTENANCE
(A) May Be Required. The Town of Newport may, at its discretion, require the
submittal of a performance security or bond with surety, cash escrow, letter of
credit or other acceptable legal arrangement prior to issuance of a permit in order
to ensure that the structural BMPs are
1. Installed by the permit holder as required by the approved stormwater
management plan, and/or
2. Maintained by the owner as required by the operation and maintenance
agreement.
(B) Amount.
1. Installation. The amount of an installation performance security shall be
the total estimated construction cost of the BMPs approved under the
permit, plus 25%.
Town of Newport
Stormwater Management Ordinance Page 33

2. Maintenance. The amount of a maintenance performance security shall
be the present value of an annuity of perpetual duration based on a
reasonable estimate of the annual cost of inspection, operation and
maintenance of the BMPs approved under the permit, at a discount rate
that reflects the jurisdiction's cost of borrowing minus a reasonable
estimate of long term inflation.
(C) Uses of Performance Security.
1. Forfeiture Provisions. The performance security shall contain forfeiture
provisions for failure, after proper notice, to complete work within the
time specified, or to initiate or maintain any actions which may be
required of the applicant or owner in accordance with this ordinance,
approvals issued pursuant to this ordinance, or an operation and
maintenance agreement established pursuant to this ordinance.
2. Default. Upon default of the owner to construct, maintain, repair and, if
necessary, reconstruct any structural BMP in accordance with the
applicable permit or operation and maintenance agreement, the
Stormwater Administrator shall obtain and use all or any portion of the
security to make necessary improvements based on the actual construction
cost of the overall system. Such expenditure of funds shall only be made
after requesting the owner to comply with the permit or maintenance
agreement. In the event of a default triggering the use of installation
performance security, the Town of Newport shall not return any of the
unused deposited cash funds or other security, which shall be retained for
maintenance.
3. Costs in Excess of Performance Security. If the Town of Newport takes
action upon such failure by the applicant or owner, the Town may collect
from the applicant or owner for the difference should the amount of the
reasonable cost of such action exceed the amount of the security held.
4. Refund. Within sixty days of the final approval, the installation
performance security shall be refunded to the applicant or terminated,
with the exception of any amount attributable to the cost (plus 25%) of
landscaping installation and ongoing maintenance associated with the BMPs
covered by the security. Any such landscaping shall be inspected one (1)
Town of Newport
Stormwater Management Ordinance Page 34

year after installation with replacement for compliance with the approved
plans and specifications and, if in compliance, the portion of the financial
security attributable to landscaping shall be released.
(5) NOTICE TO OWNERS
(A) Deed Recordation and Indications On Plat. The applicable operations and
maintenance agreement [, conservation easement, or dedication and acceptance
into public maintenance (whichever is applicable)] pertaining to every structural
BMP shall be referenced on the final plat and shall be recorded with the county
Register of Deeds upon final plat approval. If no subdivision plat is recorded for
the site, then the operations and maintenance agreement, [conservation
easement, or dedication and acceptance into public maintenance, whichever is
applicable] shall be recorded with the county Register of Deeds so as to appear
in the chain of title of all subsequent purchasers under generally accepted
searching principles.
(B) Signage. Where appropriate in the determination of the Stormwater
Administrator to assure compliance with this ordinance, structural BMPs shall be
posted with a conspicuous sign stating who is responsible for required
maintenance and annual inspection. The sign shall be maintained so as to remain
visible and legible.
(6) RECORDS OF INSTALLATION AND MAINTENANCE ACTIVITIES
The owner of each structural BMP shall keep records of inspections, maintenance, and
repairs for at least five years from the date of creation of the record and shall submit the
same upon reasonable request to the Stormwater Administrator.
(7) NUISANCE
The owner of each stormwater .BMP, whether structural or non-structural BMP, shall
maintain it so as not to create or result in a nuisance condition.
(8) MAINTENANCE EASEMENT
Every structural BMP installed pursuant to this ordinance shall be made accessible for
adequate maintenance and repair by a drainage easement.
Town of Newport
Stormwater Management Ordinance Page 35

(9) COMPLAINTS REGARDING VIOLATIONS
Whenever the administrator receives a written, signed complaint alleging a violation of
this Ordinance, he shall investigate the complaint, take whatever action is warranted,
and inform the complainant in writing what actions have been or will be taken.
(10) PERSONS LIABLE
The owner, tenant, or occupant of any building or land or part thereof and any architect,
builder, contractor, agent, or other person who participates in, assists, directs, creates,
or maintains any situation that is contrary to the requirements of this Ordinance maybe
held responsible for the violation and suffer the penalties and be subject to the remedies
herein provided.
V. MISCELLANEOUS PROVISIONS
(1) WAIVERS FOR PROVIDING STORMWATER MANAGEMENT
Every applicant shall provide for stormwater management, unless they file a written
request to waive this requirement. Request to waive the stormwater management plan
requirements shall be submitted to the Town of Newport. All requests for a waiver from
these requirements will be addressed through a Board of Adjustment hearing. Applicants
should follow the procedure for a variance hearing outlined within the Town of Newport
Code of Ordinances.
The minimum requirements for stormwater management may be waived in whole or in
part upon. written request of the applicant, provided that at least one of the following
conditions applies:
(A) It can be demonstrated that the proposed development is not likely to impair
attainment of the objectives of this Ordinance.
(B) Alternative minimum requirements for on -site management of stormwater
discharges have been established in a stormwater management plan that has been
approved by the Town of Newport.
Town of Newport
Stormwater Management Ordinance Page 36

(C) Provisions are made to manage stormwater by an off -site facility. The off -site
facility is required to be in place, to be designed, and adequately sized to provide
a level of stormwater control that is equal to or greater than that which would be
afforded by on -site practices and has a legally obligated entity responsible for
long-term operation and maintenance of the stormwater practice.
(D) The Town ,of Newport finds that meeting the minimum on -site management
requirements is not feasible due to the natural or existing physical characteristics
of a site.
(E) Non-structural practices that reduce the generation of stormwater from the site,
the size and cost of stormwater storage and provide partial removal of many
pollutants are to be used at the site.
In instances where one of the conditions above applies, the Town of Newport Board of
Adjustment may grant a waiver from strict compliance with stormwater management
provisions that are not achievable, provided that acceptable mitigation measures are
provided. However, to be eligible for a variance, the applicant must demonstrate to the
satisfaction of the Town of Newport that the immediately downstream waterways will not
be subject to: deterioration of existing culverts, bridges, dams, and other structures;
deterioration of biological functions or habitat; accelerated streambank or streambed
erosion or siltation; or increased threat of flood damage to public health, life, and
property.
Furthermore, where compliance with minimum requirements forstormwater management
is waived, the applicant will satisfy the minimum requirements by meeting one of the -
mitigation measures selected by the Town. Mitigation measures may include, but are not
Limited to, the following:
(F) The creation of a stormwater management facility or other drainage
improvements on previously developed properties, public or private, that
currently lack stormwater management facilities designed and constructed in
accordance with the purposes and standards of this Ordinance.
(G) Where the Town waives all or part of the minimum stormwater management
requirements, or where the waiver is based on the provision of adequate
stormwater facilities provided downstream of the proposed development, the
applicant shall be required to pay a fee in an amount as determined by the Town,
Town of Newport
Stormwater Management Ordinance Page 37

unless the downstream facilities have been specifically designed to address all
stormwater management requirements for the generating site.
When an applicant obtains a waiver of the required stormwater management, the
monetary fee required shall be in. accordance with a fee schedule (unless the
developer and the Town agree on a greater alternate contribution) established by
the Town, and based on the cubic feet of storage required for stormwater
management of the development in question. All of the monetary fees shall be
credited to an appropriate capital improvements program project, and shall be
made by the developer prior to the issuance of any building permit for the
development.
(H) In lieu of a monetary fee, an applicant may obtain a waiver of the required
stormwater management by entering into an agreement with the Town for the
granting of an easement or the dedication of land by the applicant, to be used for
the construction of an off -site stormwater management facility. The agreement
shall be entered into by the applicant and the Town prior to the recording of plats
or, if no record plat is required, prior to the issuance of the building permit.
(2) PENALTIES
(A) Violations of the provisions of this Ordinance or failure to comply with any of its
requirements, including violations of any conditions and safeguards established in
connection with grants of variances or conditional -use permits, shall constitute a
misdemeanor, punishable by a fine of up to $50, or a maximum 30 days
imprisonment, or both.
(B) Any act constituting a violation of the provisions of this Ordinance or a failure to
comply with any of its requirements, including violations of any conditions and
safeguards established in connection with the grants of variances or conditional -
use permits, shall also subject the offender to a civil penalty of $25. If the
offender fails to pay this penalty within ten (10) days after being cited for a
violation, the penalty may be recovered by the Town in a civil action in the nature
of debt. A civil penalty may not be appealed to the Board of Adjustment if the
offender was sent a final notice of violation in accordance with Section III(8) and
did not take an appeal to the Board of Adjustment within the prescribed time.
(C) This Ordinance may also be enforced by any appropriate equitable action.
Town of Newport
Stormwater Management Ordinance Page 38

(D) Each day that any violation continues after notification by the Administrator that
such violation exists shall be considered a separate offense for purposes of the
penalties and remedies specified in this section.
(E) Any one, all, or any combination of the foregoing penalties and remedies may be
used to enforce this Ordinance.
Town of Newport
Stormwater Management Ordinance Page 39

APPENDIX I
STORMWATER
BEST MANAGEMENT PRACTICES
A4
A±0�01
NCDENR
N.C. Department of Environment and Natural Resources
Division of Water Quality
Water Quality Section
April 1999
500 copies of this public document were printed at a cost of $680.80, or $136 per copy.

Table of Contents
�..,._"-= - -.
Page Number
Introduction
1.0
Wet Detention Basins
1.1
Introduction
2
1.2
Definitions
3
1.3
Design Requirements
4
1.4
Example Piedmont Basin Design
6
1.5
Operation and Maintenance
7
1.6
Inspections
8
1.7
Peak Flow Reduction
8
1.8
Certification/Approval
8
1.9
References
10
2.0
Stormwater Wetlands
2.1
Introduction
13
2.2
General Characteristics
13
2.3
Advantage
16
2.4
Disadvantages
17
2.5
Cost
17
2.6
Design Requirements for Extended Detention Wetlands
17
2.7
Design Requirements for Pocket Wetlands
19
2.8
Maintenance
21
2.9
Peak Flow Reduction
21
2.10
References
21
3.0
Sand
Filters
3.1
Introduction
23
3.2
Design Requirements
24
3.3
Maintenance
25
4.0
Bioretention Areas
4.1
Introduction
29
4.2
The Bioretention Concept
30
4.3
Bioretention Area Components
36
4.4
Sizing the Bioretention `Area
37
4.5
Drainage Considerations
38
4.6
Locating the Bioretention Area
40
4.7
Peak Runoff Control and Pollutant Reduction
40
4.8
Water Balance for Bioretention Areas
41
4.9
Grading Plan Guidelines
44
4.10
Planting Plan
44
4.11
Plant Species Selection
46
4.12
Number and Size of Plant Species
53
4.13
Plant Material Layout
53
4.14
Plant Material Guidelines
55

Page Number
4.15 Planting Soil Guidelines
56
4.16 Mulch Layer Guidelines
58
4.17 Plant Growth and Soil Fertility
59
4.18 Maintenance Guidelines
60
4.19 Example Soil Specifications for Bicretention Areas
62
4.20 Example Plant Specifications for Bioretention Areas
63
4.21 References
64
5.0
Grassed Swales
5.1 Introduction
66
5.2 General Characteristics
66
5.3 Advantages
66
5.4 Disadvantages
68
5.5 Costs
68
5.6 Design Requirements
68
5.7 Maintenance
68
5.8 References
69
6.0
Extended Dry Detention Basins
6.1 Introduction
71
6.2 Advantages
71
6.3 Disadvantages
71
6.4 Costs
73
6.5 Design Requirements
73
6.6 Additional Design Considerations
73
6.7 Maintenance
74
6.8 Peak Flow Reduction
74
6.9 References
74
7.0
Filter Strips
7.1 Introduction
76
7.2 Advantages
78
7.3 Disadvantages
78
7.4 Costs
78
7.5 Physical Requirements
78
7.6 Design Requirements
78
7.7 Maintenance
79
7.8 Peak Flow Reduction
79
7.9 References
8.0
Infiltration Devices
8.1 Introduction
81
8.2 Advantages
81
8.3 Disadvantages
83
8.4 Costs
83
8.5 Design Requirements
83
8.6 Peak Flow Reduction
84
8.7 Maintenance
84
8.8 References
84

List of Tables
Table 1.1 Surface Area to Drainage Area Ratio For Permanent Pool Sizing For 85% Pollutant
Removal Efficiency in the Piedmont
Table 2.1 Differences Between Stormwater Wetlands and Natural Non -Tidal Wetlands Within
the Mid -Atlantic Region
Table 2.2 Wetland Plants
Table 2.3 Surface Area to Drainage Area Ratios for Sizing Pocket Wetlands
Table 4.1 Evapotranspiration Rates for Reference Crop Species (Alfalfa) and for Bioretention
Areas
Table 4.2 Infiltration Rates for Bioretention Components
Table 4.3 Recommended Plant Species for Use in Bioretention — Shrub Species
Table 4.4 Recommended Plant Species for Use in Bioretention —Tree Species
Table 4.5 Recommended Plant Species for Use in Bioretention — Herbaceous Ground Cover
Table 4.6 Recommended Tree and Shrub Spacing
Table 4.7 Example Maintenance Schedule for Bioretention Areas
ft

List of Figures
Figure 1 Wet Detention Pond Schematic (Stormwater Guidance Manual, NC, Arnold et. al.)
Figure 2 Extended Detention Stormwater Wetland, From Design of Stormwater Wetland
Systems, Schueler, 1992
Figure 3 Stormwater Pocket Wetland, From Design of Stormwater Wetland Systems,
Schueler, 1992
Figure 4 Delaware Sandfilter, From Shaver 1992
Figure 5 Sandfilter Schematic, From Shaver, 1992
Figure 6 Modified Delaware Sandfilter Design Schematic
Figure 7 Bioretention Area Conceptual Layout , From Prince George's Co. Design Manual for
Use of Bioretention in Stormwater Management, 1993
Figure 8 Parking Edge and Perimeter Without Curb, From Prince George's Co. 1993
Figure 9 Parking Edge and Perimeter With Curb, From Prince George's Co. 1993
Figure 10 Traffic Island Bioretention Area, From Prince George's Co. 1993
Figure 11 Bioretention Swale, From Prince George's Co. 1993
Figure 12 Sizing of a Bioretention Area, From Prince George's Co, 1993
Figure 13 Sample Grading Plan, From Prince George's Co. 1993
Figure 14 Sample Planting Plan, From Prince George's Co, 1993
Figure 15 Soil Triangle of the Basic Textural Classes, From Prince George's Co, 1993
Figure 16 Enhanced Grassed Swale,.From Stormwater Management Guidance Manual, NC,
1993, Adapted from Schueler, 1987
Figure 17 Extended Dry Detention Basin, From Stormwater Management Guidance Manual,
NC, 1993
Figure 18 Forested Filter Strip, From Stormwater Management Guidance Manual, NC, 1993
Figure19 Infiltration Basin with Settling Chamber. From Stormwater Management Guidance
Manual, NC, 1993, Adapted from Schueler, 1987
iv

Introduction
Management of nonpoint source pollution is a stated goal of the 1987 Water Quality Act. An important
source of these pollutants is stormwater runoff from urban and developing areas. This runoff has, the
potential to degrade water quality in all types of waters, including, among others, those classified as
water supply watersheds, shellfish areas and nutrient sensitive waters. The management of stormwater
runoff through nonstructural controls (e.g. low density developments) is the preferred method of reducing
pollution from urban areas.. In cases where low density is not feasible, engineered stormwater controls
are viable solutions to reducing pollution. However, proper design of these engineered solutions is
essential for adequate pollutant removal. In turn, dissemination of technical information to both engineers
and local officials.on the design and maintenance of engineered solutions is equally important. Design
and review of stormwater best management practices (BMPs) as an engineered solution for stormwater
management are the subject of this Division of Water Quality (DWQ) document.
DWQ's approach to water quality management of stormwater in surface drinking water supply
watersheds, the twenty coastal counties and areas near High Quality Waters and Outstanding Resource
Waters is based first on minimizing impervious surfaces and, secondly, on treating stormwater runoff
from these surfaces. The rules contained within 15A NCAC 2H .1000 for wet detention basins provide
information on the appropriate volume of runoff to be controlled and the corresponding basin size and
configuration. North Carolina's Stormwater Management rules also allow for the construction of
alternative BMPs that meet the pollutant removal designstandard of 85% removal of total suspended
solids (TSS). This document is meant to supplement the rules in the North Carolina Administrative Code
by explaining the stormwater BMPs that will be allowed, their design criteria, and their assumed TSS
removal. These guidelines are not meant to replace these rules. The stormwater BMPs that will be
reviewed and their assumed TSS removal efficiencies, if designed according to the following
specifications, are:
BMP
Assumed TSS Removal
Wet Detention. Basins
85%
Extended Detention Wetlands
85%
Pocket Wetlands
35%
Sand Filters
85%
Bioretention Area
85%
Grassed Swales
35%
Extended Dry Detention
50%
Filter Strips
25% - 40%
Infiltration Devices
85%
The BMPs can be used alone or in combination to achieve the required pollutant removal of 85% TSS.
As experience grows in the use and effectiveness of the devices, other BMPs or other specifications may
be allowed. DWQ will continue to review and modify both the design and the removal efficiencies and
will modify them as needed. Innovative and/or proprietary BMPs may be approved on a case -by -case
basis.

1.0 Wet Detention Basins
I.1 Introduction
Wet detention basins, designed to provide water quality benefits to downstream waters, are ponds that
are sized and configured to provide significant removal of pollutants from the incoming stormwater
runoff. They maintain a permanent pool of water that is designed fora target TSS removal rate
according to the size and imperviousness of the contributing watershed. Above this permanent pool of
water, they are also designed to hold the mnoff that results from a 1 inch rain and release this over a
period of two to five days. These two basic requirements result in a pond where a majority of the
suspended sediment and pollutants attached to the sediment are allowed to settle out of the water. In
addition, water is released at a rate such that downstream erosion is lessened for smaller storms. Benefits
of wet detention ponds over other stormwater devices are many. Dry, detention basins, for example, are
less efficient in removing suspended solids and other pollutants (US EPA, 1983; Metropolitan
Washington COG, 1983) and hold little aesthetic value (Maryland DNR, 1986). Wet detention basins are
also appropriate in areas where infiltration is impractical due to low infiltration rates of the underlying
soils. In addition to water quality benefits, wet detention basins can reduce the peak runoff rate from a
developed site and control downstream erosion.
The design of wet detention basins is based on controlling the design runoff volume from the long-term
average storm in order to settle out .suspended solids and pollutants (such as heavy metals and nutrients).
Biological treatment also occurs when aquatic vegetation uses the nutrients found in the water and
sediment. DWQ uses Driscoll's model (US EPA, 1986) to determine the appropriate size of the
permanent pool. This model uses as input a long-term average storm statistically calculated from the
historical rainfall record. By using this storm and the appropriate watershed characteristics (e.g.,
impervious cover and drainage area size), a permanent water quality pool is sized to detain the storm long
enough to attain the target TSS removal. The model incorporates settling that occurs during the storm
(dynamic) and between storms (quiescent) to determine the long-term removal efficiency. The
movement of the storm runoff through the basin is assumed to occur as plug flow, with treated water
being displaced by the incoming runoff.
In addition to the permanent water quality pool, the basin must also have a temporary water quality pool
for extended detention designed to control runoff from a 1 inch rainfall. This temporary water quality
storage is located above the permanent pool and is necessary for a number of reasons. First being for
periods when runoff entering the basin is significantly warmer than the permanent water quality pool.
.During these periods, plug flow will occur to a lesser extent, and the temporary water quality volume will
.allow some of the suspended solids to fall out of suspension before being released. The detrimental
effects of this will be decreased because the runoff from the 1 inch storm is slowly released over a period
of two to five days. Secondly, the slow release of this small storm runoff volume also helps to reduce
downstream erosion.
Once the minimum surface area and temporary storage volume of the basin needed to achieve the stated
water quality goals is determined, the principal outlet and emergency spillway should be sized for flood
and downstream erosion control. The storage allocated to flood control is located on top of both water
quality pools, while the storage for downstream erosion control includes the same storage as the

water quality pool. In some instances the temporary water quality, pool may also serve as
volume for downstream erosion control.
;h locality should decide whether a policy based solely on flood control (i.e., peak flow reduction ) or
erosion control (i.e., bed -material load reduction or velocity control, both of which may also control
oding) is appropriate. An example of a flood control goal [night be to reduce the 10-year
;t-development peak discharge to the 10-year pre -development peak discharge and safely pass the
)-year storm However, research has shown that detention practices which only control the
,rdevelopment peak discharge of large storms are not effective in reducing downstream erosion. The
do flow reduction does not control bed -material loadings or reduce the duration during which the
charge velocity exceeds the critical velocity of the receiving channel (McCuen and Moglen, 1987;
meler, 1987).
taller more frequent storms (those that produce a bankfull flood) are responsible for the majority of
eambank erosion (McCuen, 1987; Andersen, 1970; Leopold et al., 1964). In a natural watershed this
nkfull flood is caused by a storm which occurs on average every 1.5 to 2 years. However, as the
xershed develops and stormwater volumes and peaks increase, bankfull floods occur more frequently
d channel erosion is more probable. Therefore, designs based on detaining runoff from a small storm,
:h as a 1-inch storm, for 48-120 hours should reduce the probability of downstream erosion (Schueler,
87). A stormwater routing technique should be executed to assure that each outlet (principal and
tergency) performs satisfactorily for its design storm. The wetted perimeter of the basin should be
rated with aquatic vegetation (Maryland DNR, 1987; Schueler, 1987; Florida DEP, 1986). This
getation not only enhances pollutant removal but provides wildlife and waterfowl habitat, and protects
shoreline from erosion.
addition to, proper design, the basin must be routinely maintained to satisfy long-term water quality
d flood control goals. The basins may be maintained either by private owner/homeowners associations
by a local government or municipality. Like gas, electricity, and sanitary sewers, stormwater
atagement may be designated as a public "utility." Under this approach, property owners within a
isdiction are assessed a monthly user -fee which:covers capital and operation and maintenance costs for
e stormwater management program (Hartigan, 1086,and Charlotte Mecklenburg Stonnwater Utilities,.
93). ,Regardless of the approach, a key to any maintenance program is the allocation of adequate
ding and the designation of the responsible party.
Definitions
1. Forebay- The forebay is an excavated settling basin or a section separated by a low weir at the head of the
primary impoundment. The forebay serves as a depository for a large portion of sediment and facilitates
draining and excavating the basin. Please see Figure 1.
Impervious Surface- Surfaces providing negligible infiltration such as pavement, buildings, recreation
facilities(e.g. tennis courts, etc.), and covered driveways. This will include porous pavement, gravel roads,
parking areas and precast concrete, but does not include wooden slatted decks or the water surface area of
swimming pools.

3. Plug Flow- Fluid particles pass through the basin and are discharged in the same sequence in which they
enter. The particles remain in the system for a time equal to the theoretical detention time. This type of
flow is especially appropriate for basins with high length -to -width ratios (Metcalf and Eddy, Inc., 1979).
4. Primary Outlet- The primary outlet is often constructed of a riser/barrel assembly and provides flood
protection (i.e., for the 10-yr. storm) or reduces the frequency of the operation of the emergency spillway.
1.3 Design Requirements
The following design requirements provide guidance for water quality control. Water quantity control
may also be required by the local government of municipal authority.
1. Permanent Water Quality Pool
a. The surface area required can be determined using the permanent pool surface area /
drainage area (SA/DA) ratio for given levels of impervious cover and basin depths as
outlined in Table I.I. The SA/DA table is based upon 85%TSS removal in the
piedmont. SA/DA Tables for the coastal counties are available from your local DWO
Regional Office. -
b. Average permanent water quality pool depths should be between 3 to 6 feet with a
required minimum of 3 feet.
c. Impervious areas used for sizing should be those that are expected in the final buildout of
the development and any offsite runoff that drains to the pond. .
d. Enough volume should be included in the permanent pool to store the sediment that will
accumulate between cleanout periods..
e. A'forebay (which may be established by a weir) must be included to encourage early
settling. This, allows drainage of only a portion of the basin in order to excavate
accumulated sediment. The forebay volume should equal about 20% of the total basin'
volume. Multiple inlets may require additional forebay volume.
2. Temporary Water Quality Pool
a. The temporary water quality pool is sized to detain the runoff volume from the first inch
of rain. This requirement refers to volume and not a particular design storm.
b. The temporary water quality pool for extended detention must be located above the
permanent water quality pool.
C. The outlet device for this temporary water quality pool should be sized to release the
runoff volume associated with the first 1-inch of rainfall over a drawdown period of 48
to 120 hours (2 to 5 days).

3. General
a. Basin shape should minimize dead storage areas and short circuiting. Length to width
ratios should be 3:1 or greater. (Barfield, et al., 1981, pp. 426-429; Florida DEP, 1982,
pg. 6-289).
b. If the basin is used as a sediment trap during construction, all sediment deposited during
construction must be removed before normal operation begins.
C. Aquatic vegetation should be included for a wetland type detention basin (Maryland
DNR, March 1987; Schueler, 1987, Chapter 4 and 9). A minimum ten foot wide shallow
sloped shelf is needed at the edge of the basin for safety and to provide appropriate
conditions for aquatic vegetation (Schueler, 1987). This shelf should be sloped 6:1 or
flatter and extend to a depth of 2 feet below the surface of the permanent pool (Shaver
and Maxted, DNREC, 1994). A list of suitable wetland species and propagation
techniques are provided in Schueler (1987) and Maryland DNR (1987).
d. An emergency drain (with a pipe sized to drain the pond in less than 24 hours) should be
installed in all ponds to allow access for riser repairs and sediment removal (Schueler,
1987).
Table 1.1 Surface Area to Drainage Area Ratio For Permanent Pool Sizing For 85 % Pollutant
Removal Efficiency in the Piedmont
% Impervious
Pnmsnent Pool Denth (feet)
Cover
HF4.0 5.0 6.0 7.0 8.0 9.0
20
0.97
0.79
0.70
0.59
0.51
0.46
0.44
30
1.34
1.08
0.97
0.83
0.70
0.64
0.62
40
1.73
1.43
1.25
1.05
0.90
0.82
0.77
50
2.06
1.73
1:50
1.30
1.09
1.00
0.92
60
2.40
2.03
1 1.71
1.51
1.29
1.18
1.10
70
2.88
2.40
2.07
1.79
1.54
1.35
1.26
80
3.36
2.78
2.38
2.10
1.86
1.60
1.42
90
3.74
3.10
2.66
2.34
2.11
1.83
1.67
Notes: Numbers given in the body of the table are given in percentages.
Coastal SA/DA ratios can be obtained from the local DWQ Regional Office.

1.4 Example Piedmont Basin Design
Step 1: Find the Surface Area of the Permanent Pool
The numbers in the Table represent surface area (SA) to drainage area (DA) percentages. SA= the wet
detention pond permanent pool surface area required to provide an expected 85% Total Suspended
Solids removal. The table is based on the amount of impervious cover as a percentage of the area
draining to the pond and the depth of the permanent pool. Impervious percentages are in the left hand
column and depths are given across the top of the table in one foot increments (Note that a depth of 3 to
6 feet is recommended). If needed, one can interpolate to find the SA/DA ratio fora specific depth or
impervious area not provided.
To determine the required permanent pool size; use the following procedure:
• Calculate the percent impervious cover of the site draining to the pond.
[amount of impervious area / total site area]
• Determine the average permanent pool depth (or select a depth for comparison purposes).
• Go to Table 1.1 and find the number corresponding to the impervious percentage calculated above and
the depth.assumed. This number, taken from the body of the table, represents the permanent pool
surface area as a percentage of the drainage area.
• To determine the required surface area of the permanent pool, take the number from the table, divide
by 100 and multiply this number by the contributing drainage area.
Example: assume a 10 acre site with 3 acres of impervious cover.
- % impervious = 3/10 = 0.30 or 30%
- Assume an average permanent pool depth of 4 feet
- From the table, with, 30% impervious and a 4 foot depth, the SA/DA ratio is given as 1.08%
- The required surface area would then be:
SA = (1.08 / 100) • 10 acres = 0.108 acres or 4,705 square feet
Step 2: Find the Volume to be Controlled from the P Storm
The design runoff volume (the temporary water quality pool) to be controlled must be held in the pond
above this pool permanent pool level. An example of finding this volume is shown below.
Example: Again, on the same 10 acre, 30% impervious site.
Using the runoff volume calculations in the "Simple Method" as described by Schueler (1987):
Rv=0.05 + 0.009(I)
Rv = runoff coefficient = storm runoff (inches) / storm rainfall (inches)
I = Percent Impervious = Drainage area (acres) / Impervious portion of the drainage area
(acres)

In this example:
Rv = 0.05 + 0.009 (30)
Rv = 0.32 (inJin.)
For the volume that must be controlled:
Volume = (Design rainfall) (Rv)(Drainage Area)
Volume = 1 inch rainfall * 0.32 (inch /inch) * 1/12 (feet / inch) * 10 acres
Volume = 0.267 acre-feet or 11,616 ft3
This volume must be drawn down over a period of two to five days.
NOTE: Other methods may be used to determine the volume of runoff from the 1" storm, but care must be taken
because all methods have their limitations and applications. The method shown is used because it offers a
conservative estimate of runoff volume for a broad variety of land uses and impervious cover percentages.
1.5 Operation and Maintenance
A study of Maryland basins found that, in general, people had more favorable impressions of wet detention
basins, were less likely to throw litter in them, and were more likely to clean and perform routine maintenance on
these basins when they were provided a prominent position in the development (Maryland DNR, 1986). No two
basins are the same, but every basin will require maintenance at some point, and their maintenance needs will
vary with the size, type of watershed, location, etc. Designation of a responsible party and routine maintenance
are vital to the proper operation of the wet detention basin (Schueler, 1987, pp. 4.13-4.17; Maryland DNR, 1986).
Adequate funding is one of the most important factors in a successful operation and maintenance program
(Maryland DNR, 1986).
Estimated annual operation and maintenance (O&M) costs for wet detention basins of 5% of construction costs
were found in a survey conducted by the State of Maryland on their wet detention basins (Maryland DNR, 1986,
pg. 37). In addition the NURP study in Washington, D.C. estimated O&M costs to be 5% of construction costs
(Metropolitan Washington COG, 1983, Chapter 3).
The maintenance needs of any particular wet pond are highly dependent on the condition of the watershed that -
contributes runoff to the pond. Maintenance should always include minimizing erosion problems and pollutant
export to the pond from the contributing watershed. A permanent easement must be provided to assure easy
access for maintenance. Care should be taken to secure all appropriate legal agreements for the easement. A
benchmark for sediment removal should be established to assure adequate storage for water quality and flood
control functions.
Again, one must remember that while general maintenance tasks are identified here, actual needs will vary from
site to site. In general, plans must indicate what operation and maintenance actions are needed, what criteria will
be used to determine when these actions are necessary, and who is responsible for these actions. Examples of
items that should be included in an operation and maintenance plan include, but are not limited to the following:
• Debris and litter control checks for inlet, outlet and orifice obstruction after every storm producing runoff.
• Provisions for routine vegetation management/mowing and a schedule for these activities. -
• Checks every 6 months, or more frequently, for:

- sediment buildup and the need for removal,
- erosion along the bank and the need for reseeding or stabilization and, if reseeding is
necessary, a reseeding schedule,
- erosion at the inlet and outlet and methods of stabilization,
- seepage through the dam, and
- operation of any valves or mechanical components.
Agreement signed and notarized by the responsible party to perform the tasks specified in the plan,
including inspections, operation, and any needed maintenance activities.
1.6 Inspections
Annual or more frequent inspections by the land owner or pond operator are strongly encouraged to ensure the
proper operation of a wet detention pond. Local governments can require more frequent inspections, and all
local codes should be consulted.
At a minimum an inspection should include and address the following:
• obstructions of the inlet and outlet devices by trash and debris,
• excessive erosion or sedimentation in or around the basin,
• cracking or settling of the dam,
• deterioration of inlet or outlet pipes,
• condition of the emergency spillway,
• stability of side -slopes,
• up and downstream channel conditions, and
• woody vegetation in or on the dam.
1.7 Peak Flow Reduction
The designer should consult with the appropriate local government for specific design or performance
requirements. In general, any flood control or peak flow volumes must be calculated using the elevation of the
permanent pool as abase. This will include the temporary water quality pool which provides attenuation of the
one inch storm.
1.8 Certification/Approval
All basins must be designed, stamped, and certified that they are built as designed by a N.C. registered
professional. Wet detention ponds designed for projects in High Quality Waters, Outstanding Resource Waters,
and Coastal Waters shall be reviewed and approved by staff in the DWQ Regional Offices. Wet detention basins
designed for Water Supply watersheds will be reviewed and approved by the appropriate local government.

Sediment
Forebay
Marsh plants Embankment with marsh plants Level of 1'
/ and spillway to main pool runoff volume
Normal
Riprap 1 l'� / pool level ,.
999 inlet protection .i Reverse -sloped
1 at
/ i orifice to slowly
1 release stonnwE
Pennenard pool
Sto"
in!
0
Riser prevents
, overflowing
Compacted -earth
embankment
Riprap
Concrete i I
anti -foliation Anti -seep
achor collars
Figure 1 'Wet Detention Pond Schematic (Stormwater Guidance.Manual, NC, Arnold et. al.)
9

1.9 References
1. Andersen, L.W. 1970.,Effects of Urban Development of Floods in Northern Virginia. United States
Geological Survey. Water Supply Paper 2001-C. Washington, D; C.
2. Arnold, I.A., ed., D.E. Line, S.W. Coffey, and J. Spooner. 1993. Stormwater Management Guidance Manual.
North Carolina Cooperative Extension Service and North Carolina Division of Water Quality. Raleigh, N.C.
3. Barfield, B.J., R.C. Warner and C.T.'Haan. 1981. Applied Hydrology and Sedimentology for Disturbed Areas.
Oklahoma Technical Press, Stillwater, Oklahoma.
4. Brater, E.F. and H.W. King. 1976. Handbook of Hydraulics. 6th edition, McGraw-Hill, USA.
5. Charlotte Mecklenburg Stormwater Utilities, 1993, Charlotte Mecklenburg Storm Water Design Manual, July
6. Florida Department of Environmental Regulation, Nonpoint Source Management Section, Tallahassee, FL.
1984 Draft. The Florida Development Manual: A Guide to Sound Land and Water Management.
7. Florida Department of Environmental Regulation, Nonpoint Source Management Section, Tallahassee, FL.
1986. Current PER Criteria for Wet Detention Systems.
8. Harrington, B.W. 1987a. Design Procedures for Stormwater Management Extended Detention Structures.
Maryland Department of the Environment, Sediment and Stormwater Division, Annapolis, MD.
9. Harrington, B.W. 1987b. Design Procedures for Stormwater Management Detention Structures. Maryland
Department of the Environment, Sediment and Stormwater Division, Annapolis, MD.
10. Harrington, B.W. 1986. Feasibility and Design of Wet Ponds to Achieve Water Quality Control. Maryland
Water Resources Administration, Sediment and Stormwater Division, Annapolis, -MD.
11. Hartigan, J.P. 1986. Regional BMP Master Plans. In: Urban Runoff Quality- Impact and Quality
Enhancement Technology. Utbonas, B. and L.A. Roesner, Eds. American Society of Civil Engineers, USA.
12. Hartigan, I.P. and T.F. Quasebarth. 1985. Urban Nonpoint Pollution Management for Water Supply -
Protection: Regional vs. Onsite BMP Plans. In: Proceedings of Twelfth International Symposium on Urban
Hydrology, Hydraulics, and Sediment Control, University of Kentucky, Lexington, Kentucky, pp. 121-130.
13. James, W.P., J.F. Bell and D.L. Leslie. 1987. Size and Location of Detention Storage. Journal of Water
Resources Planning and Management, 113(1): 15-28.
14. Janna, W.S. 1983. Introduction to Fluid Mechanics. Wadsworth, Inc., USA.
15. Leopold, L.B., M.G. Wolman and I.P. Miller. 1964. Fluvial Processes in Geomorphology. W.H. Freeman and
Sons. San Francisco, CA.
16. Lindsley, R.K. and J.B. Franzini. 1972. Water -Resources Engineering. McGraw-Hill, USA.
10

17. Malcom, H.R., M.E. Avera, C.M. Bullard and C.C. Lancaster. 1986. Stormwater Management in Urban
Collector Streams. Water Resources Research Institute ofthe University of North Carolina, Raleigh, NC. Report
No. 226.
18. Malcom, H.R. and V.E. New. 1975. Design Approaches For Stormwater Management in Urban Areas,
prepared for CE383 at NCSU, Raleigh, NC.
19. Maryland Department of Natural Resources, Sediment and Stormwater Division, Water Resources
Administration, Annapolis, MD. 1986. Maintenance of Stormwater Management Structures, A Departmental
Summary.
20. Maryland Department of Natural Resources, Sediment and Storrwater Division, Water Resources
Administration, Annapolis, MD. 1987. Guidelines for Constructing Wetland Stormwater Basins.
21. McCuen, R.H. and G.E. Moglen. 1987. Design of Detention Basins to Control Erosion. Presented at Sediment
and Stormwater Management Conference, Chestertown, Maryland. August 12, 1987.
22. McCuen, R.H. 1982. A Guide to Hydrologic Analysis Using SCS Methods. Prentice -Hall, Inc., Englewood
Cliffs, New Jersey.
23. Metcalf and Eddy, Inc. 1979. Wastewater Engineering: Treatment/Disposal/Reuse. McGraw-Hill, USA, 920
PP.
24. Metropolitan Washington Council of Governments, Department of Environmental Programs. 1983. Urban
Runoff in the Washington Metropolitan Area, Final Report. Prepared for US, EPA Nationwide Urban Runoff
Program under Grant No. PO-003208-01.
25. North Carolina Department of Natural Resources and Community Development, Raleigh, NC. November 1,
1985. Dam Safety. Title 15, Subchapter 2K.
26. North Carolina Department of Natural Resources and Community Development, Raleigh, NC. August 1,
1985. Sedimentation Control. Title 15, Chapter 4.
27. North Carolina Department of Environment, Health, and Natural Resources, Division of Land Quality,
Raleigh, NC. September 1988. Erosion and Sediment Control Planning and Design Manual.
28. Schueler, T.R. 1987. Controlling Urban Runoff: A Practical Manual for Planning and Designing Urban
BMPs. Department of Environmental Programs, Metropolitan Washington Council of Governments.
29. Shaver and Maxted. 1993. Construction of Wetlands for Stormwater Treatment. Department of Natural
Resources and Environmental Control. Stormwater Design Manual. Chapter Six.
30. United States Department of Agriculture, Soil Conservation Service, North Carolina. 1987. Pond. Technical
Guide, Section IV, No. 378-1.
31. United States Department of Agriculture,.Soil Conservation Service. 1986. Engineering Field Manual for
Conservation Practices.
11

32. United States Department of Agriculture, Soil Conservation Service. 1986. Urban Hydrology for Small
Watersheds. Technical Release No. 55.
33. United States Department of Agriculture, Soil Conservation Service. 1970. Soil Survey, Wake County, North
Carolina.
34. United States Department of Agriculture, Soil Conservation Service. National Engineering Handbook.
35. United States Department of Commerce, Bureau of Public Roads. December 1965. "Hydraulic Charts for the
Selection of Highway Culverts," Hydraulic Engineering Circular No. 5, USGPO, Washington, D.C.
36. United States Environmental Protection Agency. 1986. Methodology for Analysis of Detention Basins for
Control of Urban Runoff. EPA 440/5-87-001.
37. United States Environmental Protection Agency. 1983. Final Report of the Nationwide Urban Runoff
Program, Volume 1.
38. Urbonas, B. and W.P. Ruzzo. 1986. "Standardization of Detention Pond Design for Phosphorus Control." In
Urban Runoff Pollution. Ed. by H.C. Tomo, J. Marsalek and M. Desbordes. NATO ASI Series, Vol. G10.
Springer-Verlag, New York, New York.
39. Viessman, W. Jr., J.W. Knapp, G.L. Lewis and T.E. Harbaugh. 1977. Introduction to Hydrology. Harper and
Row, Publishers, Inc., New York, New York.
12

2:0 Stormwater Wetlands
2.1 Introduction
Stormwater wetlands can be defined as constructed systems that are explicitly designed to mitigate the.
impacts of stormwater quality and quantity that occur during the process of urbanization. They do so by
temporarily storing stormwater runoff in shallow pools that create growing conditions suitable for
emergent and riparian wetland plants. The runoff storage, complex microtopography and emergent
plants in the stormwater wetland together form an ideal matrix for the removal of urban pollutants.
Stormwater wetlands, in North Carolina, will initially include two basic designs; extended detention
wetlands (see figure 2) and pocket wetlands (see figure 3). The first type; an extended detention wetland,
is very similar in design to that of a wet detention pond'as described in the previous section. In extended
detention wetlands, extra mnoff.storage is created above the shallow marsh by temporary detention of
stormwater runoff. The basic differences between the design of a wet detention pond and that of a .
extended detention stormwater wetland is that the depth of the permanent pool of water in an extended
detention wetland should be limited to 3 feet, and a larger area of the BMP is designed to be at normal
depths of zero to one foot. When designed and constructed to the guidelines described here, an extended
detention wetland is assumed to achieve the required 85% TSS removal.
The second type of wetland that will initially be allowed in North Carolina is the pocket wetland. Pocket
wetlands are well adapted to serve smaller sites and when used in combination with filter strips and
grassed swales. They differ in design from extended detention basins irk that they have a smaller
permanent pool of water, and a forebay will not be required if the pocket wetland is being fed stormwater
from a grassed swale or vegetated filter strip designed according to the standards explained in this
document., Because they are less efficient in removing pollutants from stormwater runoff, pocket
wetlands must be used in combination with other BIVIPs to achieve the desired 85% TSS removal.
2.2 . General Characteristics
It is important to note what stormwater wetlands are not. Stormwater wetlands are not typically located
within delineated natural wetland areas. Natural wetlands provide critical habitat and ecosystems
services, are protected under state and federal statute. Stormwater wetlands should not be confused with,
created wetlands that are used to mitigate for the loss of natural wetlands under permitting provisions of
wetland protection requirements. The primary goal of wetland mitigation is to replicate the species
diversity and ecological function of the lost natural wetland; whereas, the more limited goal of
stormwater wetlands is to maximize pollutant removal and create generic wetland habitat.
Stormwater wetlands also should be distinguished from natural wetlands that receive stormwater runoff
as a consequence of upstream development. Although not intended for stormwater treatment,
stormwater-influenced wetlands are very common in urban settings. When stormwater runoff becomes a
major component of the water balance of a natural wetland, its functional and structural qualities can be
severely altered. The end result is that a stormwater-influenced wetland ultimately shares more of the
characteristics of a stormwater wetland than a natural wetland.
13

I
% - mu ED limih
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qt
IorebaY V * "+M
\ pond huller 10 maler9 minimum

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rA
s
vvv
Maintenance
19
017 cy
9 •r' .-"I` • ' Sediment
ptt�� Disposal
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hi marsh---------------

The differences in natural wetlands and wetlands constructed for the purpose of treating urban
stormwater runoff are great, and range from the amount of time the area is inundated to the sediment
loads they experience. The following table is a summary of the major differences:
Table 2.1 Differences Between Stormwater Wetlands and Natural Non -Tidal Wetlands Within
the Mid -Atlantic Region
Stormwater Wetlands
Natural Wetlands
Water balance dominated be surface runoff
Water balance often an expression of
groundwater,
Hydroperiod is "semi -tidal'; inundation and
rapid drawdown 10-30 times/year
Hydroperiod is more gradual and may change
on a seasonal basis
Standing water present year round
Standing water may only be present on a
seasonal basis
Wetland boundaries clearly defined
Wetland boundaries may adjust on a seasonal
basis due to groundwater shifts
Species diversity established by human design
or by volunteers; no prior seedbank
Species diversity maintained by seedbank
Simple topographic structure
Complex topographic structure
Relatively few species, dominated by emergent
types
Diverse number of species, with a mix of tree,
shrub, herbaceous, and emergent types
Prone to colonization by invasive species such
as Typha and Phra mites
Fewer exotic and dominant species, unless site
has been disturbed
System requires maintenance
Self -maintaining system
Sediments and water columns enriched with
nutrients and trace metals, higher turbidity
Lower quantities of pollutants in the wetland,
lower turbidity
High rates of sediment supply
Lower rate of sediment supply
Low to moderate wildlife habitat potential
Moderate to high wildlife habitat value
Note: Natural wetlands that receive urban stormwater input (i.e. stormwater influenced
wetlands) will share characteristics of both types
Table from: Design of Stormwater Wetlands Systems: guidelines for creating diverse and effective
stormwater wetlands in the mid -Atlantic Region, Schueler
2.3 Advantages
The basic intent of a stormwater wetland is to create a shallow matrix of sediment, plants, water and
detritus that collectively removes multiple pollutants through a series of complementary physical,
chemical and biological pathways. Sheet flow conditions across a wetlands, slower velocities and the
hydraulic resistance afforded by the wetland vegetation work together to provide very good conditions
for particle settling. The emergent plants that greatly characterizes stormwater wetlands help to stabilize
the sediments that settle and thereby reduce the amount of resuspension. Because stormwater wetlands
are relatively efficient in removing sediment from the water column, they are also relatively efficient at
16

removing those pollutants, such as phosphorus, trace metals, and hydrocarbons, that are adsorbed to the
surfaces of suspended particles. The plants that so characterize a stormwater wetland can also be an
advantage when considering aesthetics. Properly landscaped and maintained, a stormwater wetland can
provide anatural, park like setting.
Another advantage of stormwater wetlands is that of increased biological uptake, from both emergent
plants and algae. Stormwater wetlands, by design, focus on providing greater interactions with
emergents and longer contact times. While most aquatic plants take up nutrients from the bottom
sediments, this does not remove nutrients from the sediment and they are mostly reintroduced to the
water column at times when they will cause few problems.
Another advantage that is applicable to the pocket stormwater wetland is that they are appropriate for
smaller sites where a full, extended detention wetland or wet detention.pond might not be appropriate.
2.4 Disadvantages
The main disadvantage to extended detention wetlands, is that they occupy more land that other
stormwater BMPs. This is especially a problem for developments where most of the land will be used
for development and the ultimate amount of impervious surface will be greater than 70% of the site area.
Extended detention wetlands that are sited in watersheds that are too small will tend to dry out more
frequently, and these can become a nuisance. In most cases this can be avoided by proper sizing, and
providing a drainage area of not less than 10 acres. The volume of most stormwater wetlands is such that
they flush water through them within one week and thus do not become problem areas for mosquito
breeding.
Another disadvantage is the difficulty, at times, in finding sources for the wetland plant material. This
situation in changing, as more commercial nurseries are stocking native wetland plants. If the designer
has trouble finding supplies, it is suggested that they contact a landscape architect that has experience in
wetland mitigation.,
2.5 Costs
Costs to design and construct stormwater wetlands systems will vary widely, but for most systems will be
similar to those of wet detention basins. The costs could be increased because of the need to excavate,a
larger area, but could be decreased because excavation would not need to be as deep.
2.6 Design Requirements for Extended Detention Wetlands
The design for extended detention wetlands is very similar to that of the wet detention basins as
described in the previous chapter. The permanent pool of water should be sized as one would using
Table 1.1 with a permanent pool depth of 3 feet. The additional requirement of detaining the runoff from
the 1" storm for a period of 2 to 5 days still applies and this volume will be the volume above the
17

permanent pool. An extended detention wetland must be also be designed with a forebay, as is a wet
detention pond.
The major difference between an extended detention wetland and a wet detention basin is that the
allocation of surface area to different pond depths. For the system to function as a wetland, 70% of the
area of the permanent pool needs to be designed as a marsh with a depth of 0 to 18", with an almost equal
distribution of area (35% and 35%) between 0" to 9" and 9" to 18." The -other major difference is that
there needs to be a small pool (15% of the surface area) where the outlet is located to prevent sediment
from interfering with the outlet structure functions. The balance of the area is flexible with respect to
depth.
A most important consideration when designing both extended detention wetland systems and pocket
wetland systems is the specification and installation of plants. Tables 4.1, 4.2, and 4.3 in chapter 4 will
give a good indication of those plants that can be used in areas that will not be continually inundated.
The ponding times, shown in days under Ponding, will give a good indication of what zones of the
wetland the species should be planted. Shown below in Table 2.2 are those plants that should do well
when planted within the normal, permanent pool of the wetland.
Table 2.2 Wetland Plants
Scientyk Name
Commercial
Inundation
Wildlife Value
Notes
Common Name
Form
Availability
Tolerance
Peltandra virginta
Emergent
yes
up to I fL
High, Berries are
Full sun to partial shade
Arrow amm
eaten by wood ducks
'
Saggitaria latifolia
Emergent
yes
up to 1 ft.
Moderate. Tubers and
Aggressive colonizer
Arrowhead/ Duck potato
seeds eaten by ducks
Andropogon virginicus
Perimeter
yes
up to 3 in.
High. Songbirds and
Tolerant of fluctuating water
Broomsedge
browsers. Winter food.
levels & partial shade
and cover
Andropogon glomeratus
Emergent
yes
up to I ft
Requires full sun
Bushy Beardgmss
Typha spp.
Emergent
yes
up to I ft
Low. Except as cover
Aggressive. May eliminate
Cattail
other species. Volunteer.
High pollutant treatment.
Cemtophyllum DWQersum
Submergent
yes
yes -
Low food value. Good
Free floating SAV. Shade
Coontail
- _.
habitat and shelter for
tolerant. Rapid. growth.
fish and invertebrates
Scirpus pungens
Emergent
yes
up to 6 in.
High. Seeds, cover.
Fast colonizer. Can tolerate
Common Three -Square
Waterfowl, songbirds
periods of dryness. Full .
sun. High metal removal.
Lemma spp.
Submergent/
yes
yes
High, Food for
High metal removal
Duckweed
Emergent
waterfowl, and fish
Saururus cernuus
Emergent
yes
up to 1 fL
Low, except for wood
Rapid growth. Shade
Lizard's Tail
ducks
tolerant.
Hibiscus moscheutos
Emergent
yes
up to 3 in.
Low. Nectar.
Full sun. Can tolerate
Marsh Hibiscus
periodic dryness
Pontedena cordata
Emergent
yes
up to I ft.
Moderate. Ducks.
Full sun to partial shade
Pickerelweed
Nectar for butterflies.
Potamogeton pectinatus
Submergent
yes
yes
Extremely high.
Removes heavy metals.
Pond Weed
Waterfowl, marsh and
shorebirds.
Leersia oryzoides
Emergent
yes
up to 3 in.
High. Food and cover.
Full sun although tolerant of
Rice cut s
shade. Provides some
19

shoreline stabilization
Carer spp.
Emergent
yes
up to 3 in. -
High, Waterfowl and
Many wetland and several
Sedges
songbirds.
upland scies.
Scirpus validus
Emergent
. yes
up to 1 ft.
Moderate. Good cover
Full sun. Aggressive weedy
Soft -stem Bulrush
and food.
aliens such as P. perfoliaturn
Polygonnum spp.
Emergent
yes
up to 1 ft. -
High. Waterfowl.
Fast colonizer. Tolerant of
Smartweed
songbirds. Seeds and.
fluctuating water levels.
cover.
Juncus effesus
Emergent
yes
up to 1 ft.
Moderate.
Tolerates wet or dry
Soft Rush
conditions.
Nuphar luteum
Emergent
yes
up to 3 ft.
Moderate for food but
Fast colonizer. Tolerant of
S aaerdock
hi h for cover.
fluctuating water levels.
Panicum vergatum
Perimeter
yes
up to 3 in.
High. Seeds, cover for
Tolerates wet and dry
Switchgrass
waterfowl and
conditions.
son birds.
Acorus calamus
Perimeter
yes
up to 3 in.
Low.
Tolerant of dry periods. Not
Sweet Flag
a rapid colonizer. Tolerates
acidic conditions
Elodea canadensis
Submergent
yes
yes
Low.
Good water oxygenator.
Waterweed
High nutrient, copper,
manganese and chromium
removal.
Valisneria americam,
Submergent
yes
yes
High. Food for
Tolerant of murky water and
Wild Celery
waterfowl. Habitat for
high nutrient loads.
fish and invertebrates.
Ziwnia aquatics
Emergent
yes
up to 1 ft.
High. Food for birds.
Prefers full sun.
Wild Rice
Table from: Design of Stormwater Wetlands Systems: guidelines for creating diverse and effective stormwater wetlands in the mid -Atlantic
Region Schueler
2.7 Design Requirements for Pocket Wetlands
In those situations where a combination of stormwater BMPs will be utilized to achieve the required 85%
TSS removal, pocket wetlands in combination with grassed swales or filter strips can provide the needed
removal. For design purposes these can be thought of as a special case of the extended detention
wetland, or possibly a'small wet detention pond with special emphasis placed on the wetland plantings.
The sizing process should follow that of the wet detention basin, but with the following table (Table 2.3)
used in place of Table 1.1. For example, a development of 4.5 acres, with 3.825 acres of imperviousness
(85% imperviousness) would need a pocket wetland that had 0.96% of 4.5 acres of permanent pool. One
notable difference between this table and Table 1.1 is that no depths are given. An average depth of two
feet is assumed.
19

Table 2.3 Surface Area to Drainage Area Ratios for Sizing Pocket Wetlands
Imperviousness (%) SA/DA (%)
< 70
0.75
70
0.80
75
0.85
80
0.91
.85
0.96
90
1.02
95
1.07
100
1.12
• Pocket wetlands must capture the runoff from the 1-year 24 hour storm and release it over a period of 48
hours, or capture the runoff from the 1 inch storm and allow it to draw down over a period of 2 to 5 days.
• Average depth of no more than 2 feet.
• Pond area depth distribution should be as follows:
High Marsh (0 - 6" depths) = 50% of surface area of permanent pool
Low Marsh (6 - IT'depths) = 40%
Open water (> 18" depth) = 10%
• Cleanout access must be provided (sufficient for heavy machinery access).
• There should be a drain that will completely empty the basin for cleanout.
• . Any additional peak flow control that the local government requires must be met.
• There must be vegetation planting plan prepared by a NC licensed professional. Special consideration muse
be given to the species specified due to the frequent inundations.
• Source of wetland materials must be specified in planting plan.
• The wetland must be stabilized with 14 days of construction. This might be in the form of final vegetation,
or a temporary means of providing stabilization till the vegetation becomes established.
• If the wetland was:used during construction as a sediment basin or trap, then the basin must be cleaned out,
graded, and vegetated within 14 days of the completion of construction.
• Inlet and outlet channels should be protected from scour during high flows from large storms. Standard
erosion control measures work very well. The Land Quality Section of the North Carolina Department of
Environment and Natural Resources and the US Department of Agriculture Natural Resource Conservation
Service (SCS) can provide valuable information on erosion and sediment control techniques. -
Additional Design Considerations:
Sediments can be resuspended by the incoming runoff. Therefore it is recommended that there be either an
additional plunge pool at the inlet of the basin, or sufficient measures such as riprap to disperse the energy.
A forebay to capture sediment can minimize cleanout problems. It is a good idea to provide adequate access
for equipment to be used for cleanout. Also, paving or flexible revetment in the forebay can allow for rapid
access and quick sediment removal by heavy equipment. Pocket wetlands that receive runoff from anything
other than vegetated filters or swales should incorporate a forebay:
20

2.8 Maintenance
Pocket wetlands that have no sediment pretreatment will tend to accumulate sediment very rapidly and therefore
will need cleanout when they accumulate six inches of deposition, which in most cases will take 5 to 10 years.
An on -site sediment disposal area should be seriously,cbnsidered for any pocket wetland, and should be sized to
receive three cleanout cycles.
Due to their small size, pocket wetlands can be mucked out with a portable mudcat or backhoe. The top few
inches of sediment should be stockpiled, so that is can be replaced over the surface of the wetland after the
completion of sediment removal to reestablish through its own seedbank.
Maintenance Requirements are as follows:
Pocket: Wetlands will tend to collect debris, and it should be removed whenever it accumulates, or at least
twice annually.
Wetlands should be inspected annually after a rain event to ensure that the basin is operating as designed.
At a minimum, items that should be included in the inspection and corrected are:
- clogging of the outlet or too rapid a release,
. erosion on the banks,
- erosion at the inlet and outlet,
- sediment accumulation and the need for removal,
- condition of the emergency spillway, and
- woody vegetation in the embankment.
2.9 Peak Flow Reduction
As with a normal wet detention pond, the pocket wetland must capture the runoff from the first inch of rain, and
release it over a period of 2 - 5 days. In this case it is recommended that the designeveonfigure the outlet such
that this water quality design storm should draw down within approximately 48 hours. This will broaden the
range of wetland species.that will tolerate the conditions occurring just above the permanent pool.
2.10 References . -- -- -- -- -.. _ _..
1. Driscoll, E.D. 1986. Detention and Retention Controls for Urban Runoff. Urban Runoff Quality: Impact and
Quality Enhancement Technology. B. Urbonas and L. Roesner, editors. American Society of Civil Engineers.
2. Livingston, E. H. 1988. The Use of Wetlands for Urban Stormwater Management. Design of Urban.Runoff
Quality Controls, Engineering Foundation Conference proceedings. Roesner, L.A., B. Urbonas, and M.B.
Sonnen. editors.
3. Shaver, E. and I Maxted. Construction of Wetlands for Stormwater Treatment, Delaware Department of
Natural Resources and Environmental Control. 1993
4. Shueler, T.R., P.A. Kumble, and M.A. Hemty. 1992. A Current Assessment of Urban Best Management
Practices: Techniques for Reducing Non -Point Source Pollution in the Coastal Zone. Publication number 92705.
Metropolitan Washington Council of Governments. Washington, D.C. 127. pp.
21

5. Shueler, T. R. 1987. Controlling Urban Runoff: A Practical Manual for Planning and Designing Urban
BMPs. Publication number 87703. Metropolitan Washington Council of Governments, Washington, D.C. 275
PP•
6. U.S. EPA. 1990. Water Quality Standards for Wetlands. Office of Water Regulations and Standards. (WH-
585), EPA 440/5-90-011
7. Urbonas, B. and L.A. Roesner, eds. 1986. Urban Runoff Quality — Impact and Quality Enhancement
Technology. American Society of Civil Engineers, New York, NY. 477 pp.
8. Urbonas, B. and W.P. Ruzzo. 1986. "Standardization of Detention Pond Design for Phosphorus Control." In
Urban Runoff Pollution. Ed. by H.C. Torno, J. Marsalek and M. Desbordes. NATO ASI Series, Vol. G10.
Springer-Verlag, New York, New York.
22

3.0 Sand Filters
�a9F'�*"�tit .. ..;1>..: u^ex"'�`R_.�5.•:weiS�. ...- i-.:;'. ^,v-,q:. om.-.n .._RS.,, ..., ,.y�-}r�:A;_ ;� to>n,L°_'. �L „7s*.�,.. .. .' ..
3.1 Introduction
Sand filters are intended to address the spatial constraints that can be found in intensely developed urban
areas where the drainage areas are highly impervious. They can be used on small, urban sites that would
not normally support the hydrology of a wet detention pond and where. the soils would not support an
infiltration device.
The design procedure described below is based on the experience and equations that were developed by
the City of Austin, Texas, the State of Maryland, and the State of Delaware. Much appreciation is
extended to Earl Shaver of the Delaware Department of Natural Resources for the use of his design
guidance.
While sand filters are new in the area of stormwater treatment, they have been used for many years to
treat wastewater and as part of the process of purifying drinking water. In most cases, monitoring results
suggest that sand filters used to treat stormwater behave similarly to sand filters used in wastewater
treatment. They have been demonstrated to be effective in removing many of the common pollutants
found in urban stormwater runoff, especially those found in particulate form They have also been
shown to have at least a moderate level of bacterial removal. They have not been effective at removing
total. dissolved solids and nitrate -nitrogen and, for this reason, would best be used upstream of a
vegetated filter.
There are two basic components of a sand filter design: the sediment chamber and the sand chamber.
They are both important parts of the design, and neither can be omitted. The purpose of the sediment
chamber is to reduce the amount of sediment that reaches the sand chamber and to help ensure that
stormwater reaches the sand chamber as sheet flow. The purpose of the sand chamber is to trap the finer
sediment and sediment bound pollutants, and to provide a media for microbial removal of bacteria.
Sand filters work by receiving the first flush of runoff and settling out the heavier sediment in the
sediment chamber. Water then flows to, and is spread over the sand bed where pollutants are either
trapped or strained out. Sand'filters are -to be used only for drainage areas that have been. stabilized. -
Sediment suspended in runoff during construction could quickly clog the sand filter and render it useless.
By excluding disturbed areas from draining to the sand filter, the actual pollutant loadings that must be
treated by the sand filter are those generated by the land use activity for which it is designed. Drainage
areas directed to each sand filter should be kept below 5 acres in size. larger drainage areas are less
likely to be entirely impervious, and it is more difficult to distribute the flow of runoff across the sand
bed. Sand filters systems can be used on large parking areas and other sites larger than 5 acres if the site
is divided into smaller drainage areas that feed individual sand filters.
Sand filters are intended primarily for water quality enhancement and must be designed to handle the
runoff from frequent storm events. They must be designed to accommodate all the runoff which drains to
them, so the drainage area must be determined for actual design. For the State of North Carolina, water
quality controls must be designed for 85% removal of Total Suspended Solids. Design for this level of
treatment requires the bulk of TSS removal occur on the frequent, smaller volume storms. Sand filter
systems designed according to the requirements outlined here for control of the runoff from the first inch
23

of rainfall are considered to meet the 85% TSS removal requirement. In most of North Carolina, this
represents the runoff of over 90% of all storm events.
3.2 Design Requirements
Sediment Chamber:
• Volume = 540 fe per acre of drainage area
• At least 18 inches deep
• A surface area of at least 360 fe/acre
• Positive drainage to this chamber either in conduit or surface drainage
• No outlet except to sand chamber
• Outlet to the sand chamber to result in sheet flow
Sand Filter Chamber:
• Volume = 540 ft3 per acre of drainage area
• At least 18 inches of sand particles less than 2 mm average diameter
• A surface area of at least 360 ftr/acre
• An outlet positioned and sized such that the sand chamber will drain completely in 24 hours
• No single outlet pipe sized greater than 6 inches, in order to provide a minimum of 12 inches of sand
above pipe
General:
• Access to both chambers must be sufficient for all maintenance activities. Because the sediment
from at least the first chamber will be somewhat wet when maintenance occurs, heavy equipment
access should be provided.
• The filter must be designed to structurally withstand any load that is expected to occur (water
quantity, sediment quantity and surface loading).
The design parameters above assume an average filtration rate of 0.04 gal/min/ftr with one foot of head
on the sand surface. This rate. is needed in order to allow the runoff from the first inch of rainfall to .
pass through the filter within a period of 24 hours. The effect of this is that each square foot of sand
must transmit approximately 62 gallons of water over a period of 24 hours. This design assumes that
drainage through the sand chamber will be occurring throughout the dumtion.of runoff. Storms that -
exceed one inch of runoff, depending on their intensity and duration, may overflow the sand filter. In
these situations, runoff may not receive the same level of treatment as runoff from smaller storms.
Where stormwater quantity control is required, runoff that will flow over the sand filter must be
considered in addition to the water flowing from the normal outlet from the sand filter.
Two examples of sand filters are shown below. The first example, Figures 4 and 5, is one that might be
used in an area where land values are very high, or where there are severe physical limitations in siting a
BMP. This design uses a concrete structure and can be located or constructed in such a way as to occupy
no developable land. The second example, Figure 6, is a sand filter that might be used on a project where
spatial limitations are present, but there is some land available for stormwater management. This design
does not use the same precast -concrete structure that is used above, and would be less expensive to
construct, but would take more land area than the first example presented.
24

3.3 Maintenance
Regular. maintenance is essential to the long-term performance and durability of the sandfilter, as it is
with all stormwater BMPs. At least once a year each filter must be inspected after a storm to determine if
the filter bed is passing the runoff as expected. Depending mostly on the activities occurring in the
drainage area, most filters will show some decreased capacity for filtration after a few years.
Maintenance operations must be performed when storms of approximately one inch are not passing
through the filter within 24 hours. Maintenance for sand filters consists of removing the first two or
three inches of discolored sand, and replacing this with new sand. The sand that has been removed
would then be-dewatered, if necessary, and then landfilled. At the same time that maintenance is
performed on the sand chamber, the sediment chamber should also be pumped and cleaned. It is most
likely that the sediment removed from the first chamber will need to be dewatered before it will be
accepted at a landfill.
25

Delaware SandBlter, From Shaver IM
Jeir flow
Overland
Flow
Water level
Sedimentation chamber —
(Heavy sediments,
organics, debris)
Sand Filter Design
Cover. grates
Screen covered
with filter fabric
Trapped solids
18 inches
- of sand
Outfall pipe
Filtration chamber

Figure 11. Bloretentlon Swale, From Prince
eGeorrgge's Co. 1993
BIORETEN110N AREA LIMIT �- -I
40'
BERM
FLOW
FLOW ��. SWALE
PLAN VIEW
(NOT TO SCALE)
11 MAX. y%',
(TYp) MAX. PONOEO
WATER DEPTH
(o INCHES) IIF
Proposed Grl de•
�-+--- BIORETENTION AREA
SECTION A -A'
(NOT TO SCALE)
0

recommended that the bioretention area invert be a maximum of one-half foot below the swale invert to
provide for the appropriate depth of ponded water.
4.3 Bioretention Area Components
The bioretention area components have been combined to have complementary roles or functions to
improve water quality. The six major components of the bioretention area are:
• Grass buffer strip
• Ponding area
• Planting soil
• Sand bed
• Organic layer
• Plant material
Grass Buffer Strip
The grass buffer strip is located between the impervious surface and the bioretention area. It functions to
reduce the runoff velocity and filter particulates from the runoff prior to discharging to the bioretention
area.
The sand bed is located at the bottom of the bioretention area. It provides for drainage and aeration of the
planting soil, and augments the ability of the bioretention area to drain the runoff it receives. The sand
bed that is shown on the following drawings to be located at the side of the bioretention area where
runoff is received is meant to slow the velocity and spread out the runoff over the bioretention area The
vertical sand layer shown in Figure 7 is not required nor encouraged for use in North Carolina.
Originally this vertical sand bed was thought to provide aeration for the roots, but with the introduction
of an underdrain it also allowed for shorting circuiting of the BMP.
Ponding Area
The ponding area over the root zone provides for some surface storage of the storm water runoff; and
provides for the evaporation of a portion of the runoff. Settling of the particulates that have not been
filtered by the grass buffer or the sand bed occurs in the ponding area.
OrEanic Laver or Mulch
The organic layer provides a medium for biological growth and decomposition of organic material. The
organic or mulch layer on the surface of the soil has several physical and biological functions. The
surface layer acts as a filter for pollutants in the runoff and protects the soil from drying and eroding and
simulates the leaf litter in a forest community. The organic or mulch layer provides an environment for
microorganisms to degrade petroleum -based solvents and other pollutants.
36

Planting Soil
The planting soil is the region which provides the source of water and nutrients for the plants to sustain
growth. The voids in the soil also provide for stormwater storage. Clay particles that compose a portion
of the soil adsorb heavy metals, nutrients, hydrocarbons, and other pollutants.
Plant Material
The role of plant species in the bioretention concept is to use nutrients and other pollutants and to remove
water through evapotranspiration. A forest community structure is replicated to avoid monoculture
susceptibility to insect and disease infestation and to create a microclimate which is resistant to the
stresses to which landscaped areas in urban areas are subjected, including heat and drying winds.
4.4 Sizing the Bioretention Area
The following dimensions are recommended for bioretention areas regardless of the drainage area size
• Minimum width of a functional bioretention area should be 15 feet. A width of 25 feet is preferable.
• Minimum length should be 40 feet. For widths equal or greater,than 20 feet, the length of the
bioretention area should be at least twice the width.
• The ponded area should have a maximum depth of 6 inches.
• The planting soil should have a minimum depth of 4 feet.
The minimum width criterion of 15 feet is especially important in replicating tree and shrub distribution
patterns which exist in a forest community. This minimum width will permit the spacing of trees and
shrubs in a random fashion that 'replicates the density and distribution of plants in a natural forest. It also
assists in creating a microclimate which can offset the effects of urban stresses resulting from pollutants
in stornmater runoff, insect and disease infestation, solar radiation and wind.'
The criterion of designing the length of bioretention area to be twice the width was established to allow
sheet flow to be dispersed over a greater distance. This reduces the likelihood of concentrated flow and
maximizes the edge -to -interior area ratio.
The ponding depth of 6 inches was established to provide for adequate surface storage of water so that
water would not pond for a period in excess of four days. A ponding time in excess of four days would
severely limit the potential plant species for bioretention areas. In addition, a drawdown of four days
limits the potential of ponded water to breed mosquitoes and other undesirable insects.
The minimum planting soil depth guideline was established based on horticultural and construction
considerations. The minimum planting soil depth of four feet was set to provide appropriate moisture
capacity, and to create space for the root system of the plants to provide for resistance from,windthrow.
The construction of the bioretention area requires the excavation of a trench or pit. For most soils, trench
depths greater than four feet would require shoring measures.
In North Carolina, bioretention areas will be limited to drainage areas less than 5 acres in size. However,
in many cases the application of bioretention areas will be limited to 0.25 to 1 acre because of high
erosive velocities. The limiting factor in the drainage area size is the amount of sheet flow runoff for the
10-year storm. Generally, commercial, industrial, or residential drainage areas exceeding I acre in size
37

will have sheet flow greater than 5 cfs. When sheet flow exceeds this level, the designer should
investigate the potential erosion to vegetated areas.
The drainage area contributing to each bioretention area should be delineated for the site. The Rational
Method "C" coefficient should then be determined for the drainage area using the methodology described
in the North Carolina Erosion and Sediment Control Manual, Appendix 8.03.
The size of the bioretention area should be 5% to 7% of the drainage area multiplied by the Rational "C
coefficient. If the bioretention area is constructed according to the concept, that is including a sand bed,
then the size of the bioretention area should be 5% of the drainage area multiplied by the Rational "C"
coefficient. If the use of a sand is not considered appropriate at a particular site, then the size of the
bioretention area should be 7% of the drainage area multiplied by"the Rational "C" coefficient.
The sizing rule is based on the bioretention area infiltrating precipitation events of 0.5 to 0.7 inches
occurring over a six -hour time period. The precipitation amount and duration corresponds to the median
storm event for most of North Carolina (USEPA, 1986). A description of the methodology used to
determine the amount of runoff infiltrated into the bioretention area is contained in Section 4.8, which
describes water balance computations.
A sample computation of the size of a bioretention area is presented in Figure 12. The figure includes a
map of the drainage area that would drain to the sample bioretention area.
4.5 Drainage Considerations
The runoff entering the bioretention area will be in the fort of sheet flow. There are two major drainage
considerations in the design of bioretention areas:
• the diversion of the "first flush" of runoff into the bioretention area, and
• the potential erosion of the surface of the bioretention area by the sheet flow.
The diversion of the "first flush" can be accomplished by having sheet flow drain directly into the
bioretention area as shown in Figure 8; or through curb openings as shown in Figure 9. The curb
openings should have a width of 3 feet, which allows for the first one inch of runoff to be intercepted, but
diverts larger flows around the bioretention area, maintaining an off-line system. The hydraulic analysis
was developed using HEC-12, Drainage of Highway Pavements (U.S. D.O.T., 1984) using a drainage
area of one acre and having a commercial land use (runoff coefficient of 0.8). The hydraulic capacity is
also based on a diversion block in front of the curb opening. Multiple curb openings should be
considered for longitudinal slopes greater than 7%.
The potential erosion created by the sheet flow is a major concern in the design of the bioretention areas.
Planted ground cover can withstand a higher sheet flow velocity than mulch. It is recommended that the
maximum inflow sheet flow velocity for planted ground cover be 3 feet per second, and the maximum
inflow velocity for mulched areas be less than 1 ft/sec. Hydraulic analysis indicates that the outflow
velocity from'a 3-foot curb cut draining a 1-acre commercial tract is 0.5 ft/sec, and would be non -erosive
to either type of cover.
Where bioretention areas drain sheet flow,from asphalt pavement, velocities exceed 3 ft/sec for:
• 100-foot lengths of asphalt pavement of slope exceeding 20%.
• 200-foot lengths of asphalt pavement of slope exceeding 5%.
38

12. Siring of a Bloretention Area, From Prince George's Co,1"3
SCALE: 1' PLAN VIEW
BIORE ENTION AREA
S171NG COMPU7ATION
AREA
�C"•
OEVE OPMENT
SO. FT.
FACTOR
C x AREA -
PAVEMENT
23,800-.
0.90
21,400
GRASS
10,100
0.25
21500 --
TOTALS
33,000
2.:,500
CIOR= eV -'ON ARE. SI c
1. WITH SAND BED (5% SUM OF C x AREA)
.OS x 23.500 = 1,155 OR SAY 1.700 SO.-T.
2. WITHCUT SAND BED (77. SUM OF C x AREA)
_ .07 x .2a,S00 + 1,673 OR SAY 1 700 SO.. FT.
•S--E CHAPTEr-IV, PRINCE GEORGES COUNTY STORMWATER MANAGEMENT MANUAL

The sheet flow computations reflect laminar flow conditions. Flow in a paved or graded area varies with
the incongruities found in the surface, and will have a tendency to concentrate in the depressions. The
velocity of the concentrated flow would be higher than the laminar sheet flow velocity, and may have the
potential to erode the vegetation.
Where space constraints allow, runoff to the bioretention areas should be filtered by a grass buffer strip
and sand bed, as shown in Figure 7. The buffer strip and the sand bed will reduce the amount of fine
material entering the bioretention area, and minimize the potential for clogging of the planting soil. The
sand bed also increases the infiltration capacity and acts as a level spreader to evenly distribute flow
within the bioretention area.
4.6 Locating the Bioretention Area
The first step in locating a bioretention area fora site is creating a stormwater management concept plan.
The purpose of the stormwater management concept plan is to ensure the implementation of proper site
management quality control practices during the early planning stages of the site development process.
The information needed to develop the concept plan includes: existing and proposed drainage areas,
soils, vegetation, and hydrographic features such as streams, floodplains, and wetlands.
Preferable locations for bioretention areas include:
• areas upland from inlets or outfalls that receive sheet flow from graded areas, and
• areas of the site that will be excavated or cut.
The following locations would be undesirable for bioretention:
• areas that have a water table within 6 feet of the land surface,
• areas that have mature trees which would be removed for construction of the bioretention area,
• areas that have existing slopes of 20% or greater, and
• areas in close proximity to an unstable soil stratum
When available, areas of loamy sand soils should be used for siting the bioretention areas. These soft
soil types comprise the planting medium for bioretention areas, and locating bioretention areas in these
soils would eliminate the cost of importation of planting soil. (See planting soil guidelines in Section
4.15)
4.7 Peak Runoff Control and Pollutant Reduction
This section will examine the peak runoff control and the pollutant reduction benefits of bioretention
areas. At some sites local or state agencies may require peak flow attenuation in addition to the water
quality protection that bioretention areas provide. This chapter will outline methodology that can be used
to determine the reduction in peak runoff from bioretention methods.
This chapter will also discuss the pollutant removal from bioretention practices. Bioretention areas
remove pollutants through a variety of physical, biological, and chemical treatment processes such as
adsorption, flocculation/coagulation, ion exchange, decomposition and filtration. The amount of pollutant
loading reduction required by the North Carolina's state stormwater management program requirements
is an 85% reduction in TSS. The state assumes that when designed, constructed, and maintained properly
a bioretention area will provide a minimum of this level of treatment.
40

Bioretention areas can potentially provide peak runoff control in two ways:
Increasing the time of concentration for a site using sheet flow, and,
Providing storage for runoff.
The amount of peak reduction provided by increasing the time of concentration and runoff storage can be
readily determined using the methodology in the Soil Conservation Service Report TR-55 (U.S.D.A.,
1986). According to the time -of -travel computation in TR-55, 25 feet of grass would add 0.1 hour to the
time of concentration, compared to that of pavement. For a one -acre, commercial site that has a runoff
curve number of 90, the time of concentration increase would reduce the 2-year runoff from 4 to 3 cfs.
Bioretention areas also have the capacity to infiltrate the first one inch of runoff. The following method
can be used to determine the peak flow reduction from the infiltration of the runoff from the first one
inch of rainfall. The first step is to determine the amount of runoff from the existing site from the design
storm. For example, the runoff for the 2-year storm (3.1 inches of rainfall) for a site having a curve
number (CN) of 90 would be computed as follows:
Runoff = (P - 0-2*S)2
(P + 0.8*S)
Where: P (Precipitation) = 3.1 inches. .
S = (1000/CN - 10) = 1.11 inches
Runoff = (3.1 - 0.2 * 1.11)2
(3.1 + 0.8 * 1.11)
Runoff = 2.39 inches
The ratio of the infiltration volume to the runoff volume is 0.5/2.39 or 0.21. Entering 0.21 into Figure 6-
1 of the TR-55 Manual as the ratio of storage to runoff volume (V /V,), the ratio of peak outflow
discharge to peak inflow discharge is 0.68, or a 32 % reduction in the 2- year storm
4.8 Water Balance for Bioretention Areas
An example water balance was developed for a proposed bioretentioq'area based on the precipitation,
evapotranspiration and the infiltration for a commercial tract over a four -day time period. The four -day
period was selected for hydrologic, horticultural, and maintenance constraints. Four days is the median
time period between storms in the Washington area (EPA), and it would be undesirable for the soil in a
bioretention area to remain saturated for more than four days. A poitding time in excess of four days
would severely limit the potential plant species for the bioretention areas.
The overall objective of the water balance is to determine the amount of water to be infiltrated and
diverted from the bioretention area as a result of varying amounts of precipitation. The bioretention area
is composed of four components:
• ponding area (6" minimum)
• root zone for plants (4' minimum)
41

• sand bed surrounding the root zone
• in -situ material below the bed
These four components are shown for the bioretention areas in Figures 8 through 10. The bioretention
area used in the analysis was 15 feet wide by 40 feet long, which is the minimum size.
In the first part of the water balance simulation the site runoff enters both the sand bed surrounding the
root zone and the root zone itself at the center of the bioretention area. The volume of ponded water is
governed by the following relationship.
Ponded Volume = Runoff Volume - Sand Bed Infiltration- Root Zone Infiltration.
Runoff is diverted from the bioretention area once the ponded volume is at its limit
The water balance computations were run at one -hour intervals for the four -day (96-hour) time period
using a spreadsheet computer program The spreadsheet analysis was set up such that site, precipitation,
and soil parameters can be varied. The development of the precipitation, evapotranspiration, and
infiltration variables of the water balance are described below.
The water balance was determined for rainfall events of 0.5 and 0.7 inches. The rainfall distribution in
the Metropolitan Washington Council of Governments manual, Controlling Urban Runoff, indicates that
a rainfall of 0.7 inches would not be exceeded 80 percent of the time. The precipitation was assumed to
occur over six hours, which is the median storm length, for most of North Carolina (EPA, 1986).
In determining the runoff to the bioretention area, it was assumed that the commercial tract was over 80
percent impervious. This assumes a greater imperviousness than will be allowed in any Water Supply
watershed, but this level is often reached in developments in the twenty coastal counties.
Evapotranspiration (ET) is the aggregate term for the water use by the biological functions of plants, and
the water loss from evaporation from the surface of the plant and the adjacent soil. There has been
extensive research regarding the ET rate for various crops. It is general procedure to develop ET rates
for "reference" crop species such as alfalfa, and adjust the ET rates for the species of interest. The
monthly ET rates for alfalfa were computed using the Blaney-Criddle Potential Consumptive Use
equation. The crop coefficient (K value) for alfalfa ranges from 0.80 to 0.85. The K Value for
bioretention areas is comparable to the K value for deciduous orchards (0.6 to 0.7). Consequently, the
ET rate for alfalfa was lowered by 15% to develop the bioretention area rate.
The ET rate for alfalfa is summarized below in Table 4.1 for various months of the year. The ET rates
were computed using mean monthly temperatures, wind speed, and other weather data compiled by the
University of Maryland Agricultural Experiment Station for Prince George's County. It should be noted
that there is no appreciable ET for the months of November through March. Even though ET rates are
shown for Maryland, the computation of rates can be calculated for NC and are similar to rates in
Maryland.
42

Figure 5, Sandalter Schematic, From Shaver, M2
Ir
FLOW
r
K. row
DRALY
fua raw I I. OGTALLP[PE
GRAicQCOVER` ;', � SOLMCOVER �•A' '
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tr RE BARS SAKO
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c
psi
y
Site -Built Sand Filter -
Sedimentation Chamber Sand Chamber
Overland Flow
3 q Ufa Set
ii
z
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d eTi9•q•i,'Sr'r z i re z r,'.." pR a es $�"Y: G 3. z a,.
z rY > $y & xs F"s`His'z` s '£�2ek a' x s Y c - i� " " ,�, i a Iz % Y
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Screen covered
with filter fabric
Weir

4.0 Bioretention Areas
4.1 Introduction
It is understood that many development projects present a challenge to the designer of conventional
stormwater BMPs (i.e. wet detention ponds) because of physical constraints such as layout and
topographical relief of the site. Many of the siting problems for wet detention ponds can be overcome if
the issue of stormwater quality treatment is addressed at the very first stages of development planning.
For those sites where these significant spatial limitations cannot be overcome, bioretention areas can
provide the water quality benefit that is required.
Bioretention areas are intended to address the spatial constraints that can be found in intensely developed
urban areas where the drainage areas are highly impervious. They can be used on small, urban sites that
would not normally support the hydrology of a wet detention pond and where the soils would not support
an infiltration device. Bioretention areas provide some nutrient uptake and groundwater recharge in
addition to physical filtration. The following are guidelines for the siting, construction, and maintenance
of bioretention areas.
The design procedure described here is based on a manual published by the Prince George's County,
Maryland (Design Manual for Use of Bioretention in Stomwater Management, for Prince George's
County, Maryland.) Text and graphics are used from this manual with their permission.
Bioretention is a water quality practice developed by the Prince George's County, Maryland, Department
of Environmental Resources using plants and soils for removal of pollutants from stormwater runoff.
Bioretention employs various physical and biological processes in the water quality treatment of runoff.
These processes include adsorption, filtration, volatilization, ion exchange, and decomposition.
Biological systems have been widely used in retention and transformation of nutrients found in
agricultural and sewage treatment waste. Bioretention was developed to have a wide range of
applications for various
considerations which include:
• site conditions,
• land uses,
• soil types,
• stormwater pollutants, and
• wet or dry conditions.
Numerous studies have documented the pollutant loading/water quality impacts of development. These
studies have shown that the amount of pollutant runoff, in the form of sediment, nutrients (primarily'
nitrogen and phosphorus), oil and grease, and trace metals, increases substantially following the
development of a site. Pollutant loadings are concentrated in the "first flush" of runoff from impervious
areas. Bioretention areas are an off-line system used in the treatment of the "fast flush." Pollutant
removal is performed through physical and biological treatment processes occurring in the plant and soil
complex including transpiration, evaporation, storage, and nutrient uptake.
29

There are many potential side benefits to the use of plant based BMPs other than water quality treatment.
Planting systems, if sited properly, can improve the landscape value of the site, provide shade and wind
breaks, and absorb noise.
4.2 The Bioretention Concept
A conceptual illustration for the bioretention water quality control practice is presented in Figure 7. The
bioretention area design provides infiltration and water storage for uptake by vegetation. Figure 7 shows
the sheet flow runoff from an impervious surface (such as a parking lot) discharging into the bioretention
area through a grass buffer strip. The runoff is then infiltrated into a planting media. Once the infiltration
capacity of the planting soil is exceeded, stormwater is discharged at the surface of the planting soil.
The surface of the planting soil is depressed to allow for some ponding of the runoff. The runoff is
infiltrated through a surface organic layer of mulch and/or a ground cover to the planting soil. The runoff
is stored in the planting soil where it is discharged over a period of days to the in -situ material underlying
the bioretention area or through an underdrain.
It is important to emphasize that whenever possible, bioretention areas should be designed as an off-line
treatment system As shown in the figure, runoff from precipitation provides the major source of the
water to be used for bioretention. Water exits the bioretention area by infiltration or evapotranspiration.
Excess runoff that cannot be infiltrated or ponded or lost through evapotranspiration is diverted away
from the bioretention area. The diversion of excess runoff is accomplished by grading the bioretention
area such that the ponded surface elevation is equivalent to the elevation at which runoff is discharging
into thebioretention area.
Conceptual illustrations of various types of bioretention areas are presented in Figures 8 through 11. It
should be noted that the layout of the bioretention area will vary according to individual sites and to
specific site constraints such as underlying soils, existing vegetation, drainage, location of utilities, sight
distances for traffic and aesthetics:
The bioretention area featured in Figure 8, to be located adjacent to a parking area without a curb, has the
lowest construction cost since there is no curbing and the drainage is sheet flow. In a paved area with no
curb, pre -cast car stops can be installed along the pavement perimeter to protect the bioretention area.
A bioretention area suitable for traffic areas is shown in Figure 9. The water is diverted into the
bioretention area through the use of an inlet deflector block, which has ridges that help channel the
runoff into the bioretention area. The gutter and diversion block should meet the guidelines set forth by
the relevant local permitting authority.
A concept for a bioretention traffic island is presented in Figure 10. As shown in the illustration, the
minimum recommended width of the traffic island is 20 feet from top of curb to top of curb. When
grading a bioretention area in a traffic island, a two -foot buffer should be maintained between the curb
and -the bioretention area. The two foot buffer will minimize the possibility of drainage seeping under the
pavement section, and creating "frost heave" during winter months.
A bioretention area suitable for installation along a Swale is shown in Figure 11. A berm 1 foot in height
separates the swale from the bioretention area. To maintain an off-line system, the bioretention area
should be graded such that the overflow from the bioretention area discharges into the swale. It is
.30

Figure 7, Bloretention Area Conceptual Layout, From Prince George's Co. Design Manual for Use of
Bloretentlon in Stormwater Management,1993
EVAPO--1 RANSPIRATION
PLO p/ v
,eawoeaw�r�x TURF GRASS
_ w - �PONOING AREA
/% IN
MENT _ TuRr GRASS-:
T
GRVINO COVE. r ' PLANTING SOIL
SAND SEO
IN —SITU MAT -AL ­, INFILTRATION

Parking Edge and Perimeter Without Curb, From Prince George's Co. 1993.
TOP OF A LIMIT OF
VEGETATED BERM DISTURBANCE
�� ! ��� oenin
GROUND COVER OR
MULCH LAYER.
MIN.
taSS. BUFo-R. - - -
R SHEET FLOW k
PLAN VIEW
(NCT TO SCALE)
�1
_7~ BIORE ENTION
AREA LIMIT
EXISTING EDGE
OF PAVEMENT
. MAX. ?ONDED' GROUND COVER OR
WATER DEPTH z MULCH LAYER
SHEET FLOW - (6 INCr S)—
GRASS
BUFFER
T OFM1 PLANTING SOIL"'\ 4MIN.
'EMENT (TYPICAL)
_ 1' MIN. SAND I6ED�;�,
(TYPICAL) ---IIN—SITU MATERIAL
SIORETENTION AREA --�i

Flgum 9. Parking Edge and Perimeter With Curb, From Prince George's Co. 1993
a
BIORETENTION AREA LIMIT y ��
o.
Grass Swale //////------ LIMIT OF
/DISTURBANCE
Ex. Inlet
v IN.
� 15' MIN. �•-� � \
A
Curb
Pavement
PROPOSED
GRADE
3:1 MAX.
FLOW
\ \ Sand Bed••/
"PLAN VIEW
(NOT TO SCALE)
4' MIN.
Inlet Detleciors
With Curh Oparing
(See Appendix A)
—+1 r CURB OPENING
FMAX. PONDED
WATER DEPTH"
wt (6 INCHES) I-1
�—BIOREIZNTION AREA—�
SECTION A -A'
(NOT TO SCALE)..
qD BED
— INLET
DEFLECTOR

Figure 10. Traffic Island Bioretendon Area, From Prince j::ffe's. Co. 1993
FLOW A y„ FLOW
Pavement—z",
BIORETENTION AREA LIMIT 1 .......'}I. .:,..,
GROUND COVER OR
MULCH LAYER —
3:1 MAX.
(TYP.).-7
FLOW
711
PLANTING
SOIL
'ROPOSED a' MIN.
GRADE I
BIORETENTION AREA
MAX. PONDED WATER.
DEPTH (6 INCHES)
CURS
FLOW

Table 4.1 Evapotranspiration Rates for Reference Crop Species (Alfalfa) and for Bioretention Areas
Month
Eva otrans iration (inches)
Reference Crop
(Alfalfa)
Bioretention
Areas
April
2.88
2.45
May
5.56
4.73
June
7.74
6.58
July
8.66
7.36
August
6.56
5.58
September
4.50
3.83
October
2.64
2.24
Note: The ET rate for the month of July (7.36 in/month) is used in the water balance example.
Throughout the water balance, water infiltrates from the ponded area to the root zone, from the root zone
onto the sand layer and finally from the sand layer into the in -situ material or to the underdrain. The
infiltration rates for the sand, soil, and in -situ material were taken from the State of Maryland Manual on
Infiltration Practices. The infiltration rates used in the water balance are given in Table 4.2 for the
components of the bioretention area. These will not apply if an underdmin is used.
Table 4.2 Infiltration Rates for Bioretention Components
Bioretention Component
Soil Type
Infiltration Rate
(in/hr)
Sand Bed
Sand
8.27
Root Zone
Loamy Sand
2.41
Sandy Loam
1.02
Loam
0.52
In -Situ Material
Silt Loam
0.27
Sand ClayLoam
0.17
Clay Loam
0.09
In the water balance, the rate of sand and soil infiltration was initially set at the maximum rate until 80
percent of the layer was saturated. After 80 percent saturation was achieved, the infiltration rate was set
to:
Infiltration Rate = Max Rate * (1- Saturation Fraction)
The results of the water balance indicate that the minimum sized bioretention area of 15 by 40 feet will
infiltrate runoff for a site area of 0.2 acres for a rainfall of 0.7 inches. The runoff from a slightly larger
site area of 0.3 acres can be infiltrated for a 0.5 inch rainfall. Under the most conservative scenario for
the 0.7 inch rainfall, the bioretention area would comprise 7% of the site area. Since bioretention would
43

be located in parking islands which are required by many local governments, bioretention practices might
not significantly increase the existing landscape requirements.
The water balance is based on the root zone soil being comprised of a loam having an infiltration rate of
0.52 inches per hour, and an in -situ soil infiltration rate of 0.2 inches per hour. In -situ or root zone soils
with lower infiltration rates would lower the capacity of the bioretention area below design limits.
The water balance was also used to determine the ponding volume, and percentage of saturation for the
sand and root zone soil, for the 0.5 and 0.7 inch rainfall events. The plots indicate that the total ponding
time in the bioretention area is 16 hours, which is well below the four -day maximum time period
allowed. The plots also indicate that the sand and soil are partially saturated for 70 hours of the 96-hour
(4-day) time period, and aerobic conditions would exist in the soil for the 0.7 inch rainfall.
4.9 Grading Plan Guidelines
The goal of the grading scheme is for the first flush of runoff to be diverted into the bioretention areas,
and for larger flows to drain to the existing storm sewer system. The bypass of the larger storm volumes
allows for the retention of the first flush of runoff which has the highest concentration of pollutants. A
sample grading plan and elevation detail for a bioretention area is shown in Figure 13. The grading plan
was created for a double -cell bioretention area. There is a seven -foot buffer between cells which allow
for the planting of upland trees. As indicated in the grading plan, sheet and gutter flow is diverted into
the bioretention areas through openings in the curb. Inlet deflector blocks are located in front of the curb
openings to channel the flow into the bioretention area. The elevation of the invert of the bioretention
area is set by the curb opening elevation. The curb opening elevation is 0.5 ft. higher than the invert of
the bioretention area, so water is allowed to pond to a maximum depth of one-half foot before runoff
bypasses the bioretention area and flows into the storm drain system.
It is necessary to sequence the installation of sediment and erosion controls to minimize the
contamination of the planting soil with silts and fines. Sediment controls are installed around the area to
be disturbed before grading, and around the bioretention area before the excavation of the trench or pit
for the planting soil. Sands and fines will have a tendency to clog the planting soil and impair the
functions of the bioretention area.
4.I0 Planting Plan
The planting plan considerations include site planning and aesthetic considerations for designing the
bioretention plant community. Tables listing suitable species of trees, shrubs, and ground cover are,
provided at the end of this section.
The use of plant material in bioretention areas is modeled from the properties of a terrestrial forest
community ecosystem. The terrestrial forest community ecosystem is an upland community dominated
by trees, typically with a mature canopy, having a distinct sub -canopy of understory trees, a shrub layer,
and herbaceous layer. In addition, the terrestrial forest ecosystem typically has a well -developed soil
horizon with an organic layer and a mesic moisture regime. A terrestrial forest community model for
stormwater management was selected based upon a forest's documented ability to cycle and assimilate
nutrients, pollutants, and metals through the interactions among plants, soil,.and the organic layer.
44

Flgnre 13. Sample Grading Plan, From Ppince George's Co. 1993
�Ea. Panmmtf 9d � '
i
.�rvv .l
9IORETENTION
LIMIT ELEV., _
PVASE 2
__T P?NOz
7l5 iDR3.wCE� � \\\
.i
SCALE: I' a ::
. Wl t D.O...
.Jm CN]b Oaen'u ,a
D.Beclar
.+tn o:rb
genmq
iL
`'.4A= 2'
.• sL- FENc_
-•-PL.AN 'AEW
F-- act—axnox ].au —�
OOSnNc MVJNO
-�09 --- i--- OPM P. eY?IiN]
NOM _ iROiOS
PNcD
M,Oe [1tN`' '1(l MAOE WFi cUla=
r
SECTION A -A'
(t.c: TO Sc:tE)

Key elements of the terrestrial forest ecosystem that have been incorporated into bioretention design
include species diversity, density, morphology, and use of native plant species. Species diversity protects
the system against collapse from insect and disease infestations and other urban stresses such as
temperature and exposure. Typically, native plants demonstrate a greater ability of adapting and
tolerating physical, climatic, and biological stresses ( Metropolitan Washington Council of Governments,
1992).
4.11 Plant Species Selection
Plant species appropriate for use in bioretention areas are presented in Tables 4.3 through 4.5. These
species have been selected based on their ability to tolerate urban stresses such as pollutants, variable soil
moisture and ponding fluctuations. Important design considerations such as form, size, and type of root
system are also included. A key factor in determining the suitability of a species is its ability to tolerate
the soil moisture regime and ponding fluctuations associated with bioretention. The plant indicator status
(Reed, 1988) of listed species are predominantly facultative (i.e., they are adapted to stresses associated
with both wet and dry conditions); however, facultative upland and wetland species have also been
included. This is important because plants in bioretention areas will be exposed to varying levels of soil
moisture and ponding throughout the year, ranging from high levels in the spring to potential drought
conditions in the summer. All of the species listed in the tables are commonly found growing in the
Piedmont or Coastal Plain regions of North Carolina as either native or ornamental species.
Designers considering species other than ones listed in Tables 4.3 — 4.5 should consult the following
reference material on plant habitat requirements, and consider site conditions to ensure that alternative
plant material will survive:
• Hightshoe, G.L., 1988. Native Trees, Shrubs and Vines for Urban and Rural America. Van Nostrand
Reinhold, New York, New York.
• Reed, P.B.Ir., 1988. National List of Species That Occur in Wetlands: Northeast. United States Fish
and Wildlife Service, St. Petersburg, Florida.
Reasons for exclusion of certain plants from bioretention areas include inability to meet the criteria
outlined in Tables 4.3 — 4.5 (pollutant and metals tolerance, soil moisture and ponding fluctuations,
morphology, etc.) In addition, species that are considered invasive, or are otherwise not recommended,
should not be specified.
Each site is unique and may contain factors that should be considered before selecting plant species. An
example plant material checklist is provided in Section 4.20. The checklist has been developed to assist
the designer in identifying critical factors about a site that may affect both the plant material layout and
the species selection.
Selection of plant species should be based on site conditions and ecological factors. Site considerations
include microclimate (light, temperature, wind), the importance of aesthetics, overall site development
layout, and the extent of maintenance requirements. Exposure to wind and light will affect the candidate
species. These factors combined with the potential sitings of any structures will also need to be
considered. Of particular concern is the increase in reflection of solar radiation from buildings upon
46

bioretention areas. Aesthetics can be important in development projects that have high visibility. Species
that require regular.maintenance (shed fruit or are prone to storm damage) should be restricted to limited
visibility of pedestrian and vehicular traffic.
Species selection should consider interactions with adjacent plant communities. Nearby existing
vegetated areas dominated by non-native invasive species pose a threat to adjacent bioretention areas.
Adjacent plant communities should be evaluated for compatibility with any proposed bioretention area
species. Invasive species typically develop into monocultures by out competing other species.
Mechanisms to avoid encroachment of undesirable species include providing a soil breach between the
invasive community for those species that spread through rhizomes and providing annual removal of
seedlings from wind home seed dispersal. It is equally important to determine if there are existing
disease or insect infestations associated with existing species on site or in the general area that may effect
the bioretention plantings.
This space intentionally left blank
47

Table 4.3 RECOMMENDED PLANT SPECIES FOR USE IN BIORETENTION --- SHRUB SPECIES
Species
Moisture Regime
Tolerance
Morphology
General
Characteiistics
Scientific Name Indicator Habitat Ponding Salt Oil/ Metals Insects Exposure Form Height Root Native Wildlife
Common Name Status Grease. System
Berberis koreana
FAC
Mastic
2-4
H
H
H
M
Sun to partial
Oval shrub
4-6'
Shallow
No
Low
garb
Shade
Berberis thunbergil
FAC
Mesic
2-4
H
H
M
M
Son
Rounded,
5-T
Shallow
No
Med.
Japanese barberry
Broad, dense
shrub
Clethra ainifolia
FAC
Mesic to
2-4
H
-
H
Sun to partial
Ovoid shrub
6-12'
Shallow
Yes
Med.
sweet repperbush
wet mesic
Shade
Comas Stolonifera
FACW
Mesic-
2-4
H
H
H
M
Sun or Shade
Arching,
8-10'
Shallow
Yes
High
red osler dogwood
H dric
Spreading
Eaonymus slams
FAC
Mesic
1-2
H
H
H
M
Sun or shade
Flat, dense,
5-T
Shallow
No
No
winged euonymous
horizontal
branching
Euonymus eumpaeus
FAC
Mesic
1-2
M
M
M
M
Sun to partial
Up -right dense
10-12'
Shallow
No
No
shade
oval shrub
-spindle-tree
Hamamelis virginia
FAC
Mesic
2-4
M
M
M
M
San or Shade
Vase -like
4-6'
Shallow
Yes
Low
witch -hazel'
compact shrub
Hypericum densii lomm
FAC
Mesic
2-4
H
M
M
H
Sun
Ovoid Shrub
3-6'
Shallow
Yes
Med
common St. John's wort
11tx glabm
FACW
Mesic to
2-4
L
M
-
H
Sun to partial
Spreading
6-12'
Shallow
Yes
High
inkbeny
wet Mesic
sun
shrub
flex verticillate
FACW
Mesic to
24
L
M
-
H
Sun to partial
Spreading
6-12' -
Shallow
Yes
High
winterberry
wet Mesic
sun
shrub
Junipems communis
FAC
Dry Mesic
1-2
M
H
H
M-H
Sun
Mounded shrub
3-6'
Deep
No
High
"comressa"
to Mesic
taproot
common juniper
Junipents horizontalis
FAC
Dry Mesic
1-2
M
H
H
M-H
Sun
Matted shrub
0-3'
Deep
No
High
"Bar Harbor"
to Mesic
- taproot
creeping Juniper
Lindera benzoin
FACW
to
24
H
-
-
H
Sun
Upright shrub
6-12'
Deep
Yes
High
s icebush
wMesic
et Mesic
Myrica pennsylvanica
FAC
Mesic
2-4
H
M
M .
H
Sun to partial
Rounded,
6-8'
Shallow
Yes
High
babe
sun
compacted

shrub
Physocarpus opulifolius
FAC
Dry Mesic
2-4
M
-
-
H
Son
Upright shrub
6-12'
Shallow
Yes
Med
ninebark
to wet
-
Mesic
Viburnum cassinoides
FACW
Mesic
2-4
H
H
H
H
Sun to partial
Rounded,
6-8'
Shallow
Yes
High
northern wild raisin
sun
compacted
shrub
Viburnum denraium
FAC
Mesic
2-4
- H
H
H
H
Sun to partial
Upright, multi-
8-10'
Shallow
Yes
High
arrow -wood
sun
stemmed shrub
Viburnum lenrago
FAC
Mesic
2-4
H
H
H
H
Sun to partial
Upright, multi-
8-10'
Shallow
Yes -
High
nano be
sun '
stemmedshrub

Table 4.4 RECOMMENDED PLANT SPECIES FOR USE IN BIORETENTION -- TREE SPECIES
Species
Moisture Regime
Tolerance
Morphology " .
General
"
Characteristics
'Scienrific Name Indicator Habitat Ponding, Salt Oil/ Metals Insects Exposure Fonn Height Root Native Wildlife
Common Name Status Grease System
Acer rubrum
FAC
Mestic -
4.6
H
H -
H
H
Single to multi-
50-70'
Shallow
Yes
High
red maple
H dric
stem tree
Amelanchiercanadensis
FAC
Mesic
2-4
H
M
-
H
Single to multi-
30-50'
Shallow
Yes
High
shadbmsh
stem tree
Beiula mgm
FACW
Mesic to
4-6
-
M
- M
H
EParfial
Single to multi-
50-75'
Shallow
Yes
Med.
river birch
H dric
stem tree
Benda populifolia -
FAC
Xeric-
4-6
H
H
M
H
Single to multi-
35-50'
Shallow
Yes
High
a birch
H dric
stem tree
to deeFr
inus americans
FAC
Mesic
2-4
M
H
H
HLarge
tree
50-80'
Deep
Yes
Low
white ash
Fraxinus pennsylvanica
FACW
Mesic
4-6
M
H
H
H
Partial Sun
Large tree
40-65'
Shallow
Yes
Low
green ash
I
to deep
Ginkgo biloba
FAC
Mesic
2-4
H
H
H
H
Sun
Large tree
50-80'
Shallow
No
Low
Maidenhair tree
to deep
Gledirsia triacanthos
FAC
Mesic
2-4
H
M
-
M
Sun
Small canopied
50.75'
Shallow
Yess
Low
honeylocust
large tree
to deep
taproot
Jumperus virginiana
FACU
Mesic-
2-4
H
H
-
H
Sun
Dense single
50-75'
Taproot
Yes
Very
eastern red cedar
Xeric
stem tree
High
Koelreuteria paniculare
FACU
Mesic "
2-4
H
H
H
H
Sun
Round, dense
.20.30'
Shallow
No
No
olden -rain tree
shade tree
Liquidambar styracifiva
PAC
Mesic'
4-6
H
H
H
M
Sun
Large tree
50-70'
Deep
Yes
High
sweet bum
taproot
Nysm sylvatica
FACW
Mesic-
4-6
H
H
H
H
Sun
Large tree
40.70'
Shallow
Yes
High
black gum
Hydric
to deep
taproot
Platanus acerfolia
FACW
Mesic
2-4
H
-
M
Sun
Large tree
70-80'
Shallow
No
London lane -tree
Platanus accidentalis
FACW
Mesic-
4-6
M
M
M
M
Sun
Large tree
70-80'
Shallow
Yes
:Mewdd
camore -
H dricPo
ulus deltoides
FAC
Xeric -
46
H
H
H
L
Sun
Lar a tree with
75-
Shallow
Yes

eastern cottonwood
Mesic
spreading
100'
branches
Pyrus calleryana
PAC
Mesic
2-4
H
H
H
H
Sun
Dense shade
30-50'
Shallow
No
Low
Callery pm
tree
to deep
Quercus bicolo
FACW
Mesic to
4-6
H
-
H
H
Son to partial
Large tree
75-
Shallow
Yes
High
swarnp white oak
wet Mesic
sun
100'
Quercus coccinea
PAC
Mesic
1,2
H
M
M
M
Sun
Iarge tree
50-75'
Shallow
Yes
High
scarlet oak
to deep
Quercus macrocarpa
PAC
Mesic to
2-4
H
H
H
M
Sun
Large
75-
- Taproot
No
High
bur oak
wet Mesic
I spreading tree
100'
Quercus palustria
FACW
Mesic-
4-6
H
H
H
M
Sun
Large tree
60-80'
Shallow
Yes
High
Pin oak
Hydric
to deep
.
taproot
Quercus phellos
FACW
Mesic to
4-6
H
- -
-
H
Sun
large Iree
55-75'
Shallow
Yes
High
willow oak
wet Mesic..
Quercus rubra
PAC
Mesic
24
M
H-
M
M
Sun to partial
Large
60-90'
Deep
I
Yes
High
sun
s readin tree I
to root

Table 4.5 RECOMMENDED PLANT SPECIES FOR USE IN BIORETENTION ---. HERBACEOUS GROUND COVER
Species
Moisture Regime
Tolerance
Morphology
General
-
-
Characteristics
- Scientific Name Indicator Habitat Bonding Salt Oil/ Metals Insects Exposure Farm Height Root- Native Wildlife
Common Name Status Grease System
Agrostis albs
FAC
Mesic-
1-2
H
-
H
H
Shade
Grass
23'
Fiberous
Yes
High
redtop,
Xeric
-
Shallow
Andropogan
gerardi
FAC
Dry Mesic
1-2
-
-
-
-
Sun
Grass
2-3'
Fiberous
Yes
High
blue'oint
-
- Mesic
Shallow
Deschampsia caespilosa
FACW
Mesic to
2-4
-H
-
H
H
Sun
Grass
2-3'
Fiberous
Yes
Med.
tufted hairgrass
wet Mesic
Shallow
Hedera Helix
FACU
Mesic
I-2
-
-
H
Sun
Everground
-
Fiberous
No
Low
English Ivy
ground cover
Shallow
lotus Corniculams;
FAC
.Mesic-
1-2
H '
L
H
H
Sun
Grass
2-3'
Fiberous
Yes
High
birdsfoot-trefoil
Xeric
I
Shallow
Pachysandra terminalis
FACU
Mesic
1-2
-
-
-
M -
Shade
Evergreen
-
Fiberous
No
Low
Japanese pachysandria
ground cover
Shallow
Panicum veratum
FAC to
Mesic
2-4
H
-
-
H
Sun or Shade
Grass
4-5'
Fiberous
Yes
High
switch Aress
FACU
-
Shallow
Parthenocissus
FACU
Mesic
1-2
-
-
-
H
Shade
Evergreen
-
Fiberous
No
Low.
Tricuspida
-
ground cover
Shallow
Boston Ivy
Vinca major
FACU
Mesic
1-2
-
-
-
H
Shade
Evergreen
-
Fiberous
No
Low
laze periwinkle
ground cover
Shallow
Vinca minor
FACU
Mesic
1-2
-
-
H
Shade
Evergreen
-
Fiberous
I No
Low
common periwinkle
ground cover
Shallow

4.I2 Number and Size of Plant Species
A minimum of three species of trees and three species of shrubs should be selected to insure diversity.
In addition to reducing the potential for monoculture mortality concerns, a diversity of trees and shrubs
with differing rates of transpiration may ensure a more constant rate of evapotranspiration and nutrient
and pollutant uptake throughout the growing season.
Herbaceous ground covers are important to prevent erosion of the mulch and the soil layers. Suitable
herbaceous ground covers are identified in Table 4.5.
The number of tree and shrub plantings may vary, especially in areas where aesthetics and visibility are
vital to site development, and should be determined on an individual site basis. On average, 1000 trees
and shrubs should be planted per acre. For example, a bioretention area measuring 15' x 40' would
contain a combination of trees and shrubs totaling 14 individuals. The recommended minimum and
maximum number of individuals and spacing are given in Table 4.6.
Two to three shrubs should be specified for each tree (2:1 to 3:1 ratio of shrubs to trees).
Table 4.6 Recommended Tree and Shrub Spacing
Tree Spacing
(feet)
Shrub Spacing
(f,
Total Density
I (stems/acre)
Maximum
19
12
400
Average
12
8
1000
Minimum
11
7
1250
At installation, trees should be 2.5 inches in caliper, and shrubs 3 to 4 feet in height or 18 to 24 inches in
spread. Ground cover may be as seed or, preferably, plugs. The relatively mature size requirements for
trees and shrubs are important to ensure that the installation of plants are readily contributing to the
bioretention process (i.e., evapotranspiration, pollutant uptake).
4.13 Plant Material Layout
There are two guidelines that should apply to all bioretention areas. First, woody plant material should
not be placed within the immediate areas of where flow will be entering the bioretention area. Besides
possibly concentrating flows, trees and shrubs can be damaged as a result of the flow. Secondly, it is
recommended that trees be planted primarily on the perimeter of bioretention areas to maximize the
shading and sheltering of bioretention areas and to create a microclimate which will limit the extreme
exposure from summer solar radiation and winter freezes and winds. An example planting plan is shown
in Figure 14.
Often designers will find that the environmental factors such as wind and temperature vary not only on
site but also between bioretention areas. As a result, the designer may need to consider the placement of
each plant. An example would be to consider placing evergreen trees or other wind tolerant species on
the northern end of a bioretention area, against cold winter winds.
53

Figure 14. Sample Planting Plan, From Prince George's Co,1993
1 F.A. i Ex Pe amen;
1 N8 mixe penx_:cr �m
L7.4i OF - `taro aaemn
tzss (:yaJ
C 1 OP .- 3 r .. ._>Lu c :., � _
P.S. S v:
m �
A
1-O:P.�'S<,,,/,
L PLANiwO
3 IN. 3.F A
i,..I =TOp..
'( J 1 FA.
1AP. L 3 Yi 1 OP.
0 15 ;c
SCALE: 1' L' .
PLANTING PLAN LEGEND '
HERBACEOUS COVER* SAND BED -
TREE SHRUB
TREE SHRUB
SYMBOL SCIENTIFIC N-ME CCM:!ON NAMe SYMBOL SCIENTIFIC NAME COMMON NAME
F.A. Froxinus cmeric_na white csh C.A. ' -Clethra ciniielie sweet pepperbush
N.S. Nyssa syWatica blcct cum H.V. Acmamelis virginiec witch ha -el
O.P. Ouercus palustris pin cck I.V. Ilex verticilla:c wintermerry
O.R. Ouereus n:brc red eck L.B. Lindere benzain spieecush
V.D. Viburnum dentctum crrawwood
V.L. -.Viburnum lentage ncnnyberry -

The final plant material layout should resemble a random and natural placement of plants rather than a
standard landscaped approach with trees and shrubs in rows or other orderly fashion. The most important
goal dictating each consideration is to provide optimal conditions for plant establishment and growth.
The idea of presenting bioretention areas as landscaped areas should not be the main focus of a
bioretention design; however, the goals of the bioretention system can be achieved without sacrificing
aesthetics.
4.14 Plant Material Guidelines
The plant material should conform to the current issue of the American Standard for Nursery Stock
published by the American Association of Nurserymen. Plant material should be selected from certified
nurseries that have been inspected by state or federal agencies. The botanical (scientific) name of the
plant species should be in accordance with a standard nomenclature source such as Gray's Manual of
Botany (Fernald, 1950).
Some of the plant species listed in Tables 4.3 — 4.5 (Recommended Plant Species For Use in
Bioretention) may be unavailable from standard nursery sources. Designers may need to contact
nurseries specializing in native plant propagation. All plant material specified must be propagated,
germinated or otherwise developed from nurseries located in approximately the same Hardiness Zone.
The success of bioretention areas is very dependent on the proper installation specifications that are
developed by the designer and subsequently followed by the contractor. The specifications include the
procedures for installing the plants and the necessary steps taken before and after installation.
Specifications designed for bioretention should include the following considerations:
• Sequence of Construction
• Contractor's Responsibilities
• Planting Schedule and Specifications
• Maintenance
• Warranty
The sequence of construction describes site preparation activities such as grading, soil amendments, and
any pre -planting structure installation. It also should address erosion and sediment control procedures.
Erosion and sediment control practices should be in place until the entire bioretention area is completed.
The contractor's responsibilities should include all the specifications that directly affect the contractor in
the performance of his or her work. The responsibilities include any penalties for unnecessarily delayed
work, requests for changes to the design or contract, and exclusions from the contract specifications such
as vandalism to the site, etc.
The planting schedule and specifications include type of material to be installed (e.g., ball and burlap,
bare root, or containerized material), timing of installation, and post installation procedures. Balled and
burlapped and containerized trees and shrubs should be planted during the following periods: March 15
through June 30 and September 15 through November 15. Ground cover excluding grasses and legumes
can follow tree and shrub planting dates. Grasses and legumes typically should be planted in the spring
of the year. The planting schedule and plan should address the following items:
• transport of plant material
55

• preparation of the planting pit
• fertilization
• installation of plant material
• stabilization: seeding (if applicable)
• watering and general care
An example of general planting specification for trees and shrubs and ground cover is given in Section
4.20.
Typically, a warranty is established as a part of any plant installation project. The warranty covers all
components of the installation for which the contractor is responsible. The plant and mulch installation
for bioretention should be performed by a professional landscape contractor. An example of standard
guidelines for landscape contract work is provided below:
• The contractor shall maintain a one (1) year 80% care and replacement warranty for all planting
• The period of care and replacement shall begin after inspection and approval of
the complete installation of all plants and continue for one year
• Plant replacements shall be in accordance with the maintenance schedule
4.I5 Planting Soil Guidelines
The characteristics of the soil play an important role in the improvement of water quality through the use
of bioretention systems. The soil is a three-phase system composed of gas, liquid, and solid, each of
which in the proper balance is essential to the pollutant removal achieved through bioretention. The soil
anchors the plants and provides nutrients and moisture for plant growth. Microorganisms inhabit and
proliferate within the soil solution, and the unsaturated pore space provides plant roots with the oxygen
necessary for metabolism and growth. A desirable planting soil for bioretention must be permeable to
allow infiltration of runoff and provide adsorption of organicnitrogen and phosphorus.
The recommended planting soil for bioretention would have the following properties:
Soft Texture and Structure - It is recommended that the planting soils for bioretention have a sandy loam,
loamy sand, or loam texture. Suitable planting soils for bioretention-areasare indicated on the soil
triangle in Figure 15. These soils have a clay content ranging from 10 to 25 %. Water balance
computations in Section 4.8 indicate that soils with infiltration rates greater than 0.5 in/hr are suitable for
bioretention. Sandy loam, loamy sand, and loam soils have minimum infiltration rates ranging from 0.52
to 2.41 in/hr. Other types of loamy soils such as silt loamy, and sandy clay Icarus have infiltration rates of
0.27 in/hr or lower and are not suitable for bioretention.
Soil Acidity - In a bioretention scheme, the desired soil pH would lie between 5.5 and 6.5 (Tisdale and.
Nelson, 1975). The soil acidity affects the ability of the soil to adsorb and desorb nutrients, and also
affects the microbiological activity in the soil.
56

Figure 15. Soll Triangle of the Basic Textural Classes, From Prince George's Co, M ,
USDA TEXTURAL TRIANGLE
100% clay
90 10
80 20
70 Clay 30
/ /-
60 40
.a
o�
50 Silty
50
VC,\/\ clay
Sandy
Q� 40
60�
\ clay Clay Silty
CIO
30 Sandy clay loam loam
/ 70
oom
\ toam� . ,
V
20 _
60
-16
10 — Sc� r = Silt
90
.1a m loam
Silt
Sand on. — __-
90 SO 70 6050 40 30
100% sand
20 10
♦� Percent sand
- 1007 silt
SUffASLE PLANTING SOIL
FOR SIORETENTION

Soil Testing - Prior to installation, the planting soil for bioretention areas must be tested for pH, organic
matter, and other chemical constituents. The soil should meet the following criteria (Landscape
Contractors Association, 1986):
pH range:
5.5 - 6.5
Organic matter:
1.5 - 3.0%
Magnesium (Mg):
35 Ibs/acre
Phosphorus (P20s):
1001bs/acre
Potassium (K20):
85 lbs/acre
Soluble salts:
not to exceed 500 ppm
It is recommended that one test for magnesium, phosphorus, potassium, and soluble salts be performed
per borrow source or for every 500 cubic yards of soft material. It is recommended that a sieve analysis,
pH, and organic matter test be performed for each bioretention area.
Soil Placement -Placement of the planting soil in the bioretention area should be in lifts of 18 inches or
less and lightly compacted. Minimal compaction effort can be applied to the soil by tamping with a
bucket from a dozer or a backhoe. Sample specifications relating to the planting soil are contained in
Section 4.19.
4.I6 Mulch Layer Guidelines
The mulch layer plays an important role in the overall bioretention design. This layer serves to prevent
erosion and to protect the soil from excessive drying. Soil biota existing within the organic and soil layer
are important in the. filtering of nutrients and pollutants and assisting in maintaining soil fertility.
Bioretention areas can be designed either with or without a mulch layer. If a dense herbaceous layer or
groundcover (70 to 80% coverage) is provided, a mulch layer is not necessary. Areas should be mulched
.once trees and shrubs have been planted. Any ground cover specified as plugs may be installed once
mulch has been applied.
The mulch layer recommended for bioretention may consist of either a standard landscape fine shredded
hardwood mulch or shredded hardwood chips. Both types of mulch are commercially available and
provide some protection from erosion.
The mulch should be aged(stockpiled) for a minimum of six months before being applied to bioretention
areas. However, an optimal age for mulch is twelve months. Mulch should be free of weed seeds, soil,
roots, or any other substance not consisting of either bole or branch wood and bark. The mulch should be
uniformly applied approximately 2 to 3 inches in depth. Mulch applied any deeper than three inches
reduces proper oxygen and carbon dioxide cycling between the soil and the atmosphere.
Grass clippings are unsuitable for mulch, primarily due to the excessive quantities of nitrogen stored in
the material. Adding large sources of nitrogen would limit the capability of bioretention areas to filter the
nitrogen associated with runoff.
58

4.17 Plant Growth and Soil Fertility
An understanding of plant growth and soil fertility development over time is important for estimating the
success and life span of bioretention areas. The physical, chemical, and biological factors influencing
plant growth and development will vary over time as well as for each bioretention area. However, there
are certain plant and soil processes that will be the same for all bioretention areas.
1. Plant Growth
The role of plants in bioretention includes uptake of nutrients and pollutants and evapotranspiration of
stormwater runoff. The plant material, especially ground covers, are expected to contribute to the
evapotranspiration process within the first year of planting. However, trees and shrubs that have been
recently planted demonstrate slower rates of growth for the second year due to the initial shock of
transplanting. The relative rate of growth is expected to increase to normal rates after the second growth
season.
The growth rate for plants in bioretention areas will follow a similar pattern to that of other tree and
shrub plantings (reforestation projects, landscaping). For the first two years, the majority of tree and
shrub growth occurs with the expansion of the plant root system. By the third or fourth year the growth
of the stem and branch system dominates, increasing the height and width of the plant. The comparative
rate of growth between the root and stem and branch system remains relatively the same throughout the
life span of the plant. The reproductive system (flowers, fruit) of the plants is initiated last.
The growth rates and time for ground covers to become acclimated to bioretention conditions is much
faster than for trees and shrubs. The rate of growth of a typical ground cover can often exceed 100
percent in the first year. Ground covers are considered essentially mature after the first year of growth.
The longevity of ground covers will be influenced by soil fertility and chemistry as well as physical
factors, such as shading and overcrowding from trees and shrubs and other ecological and physical
factors.
Plants are expected to increase their contribution to the bioretention concept over time, assuming that
growing conditions are suitable. The rate of plant growth is directly proportional to the environment in
which the plant is established. Plants grown in optimal environments experience greater rates of growth.
One of the primary factors -determining this is soil fertility. -- - I _
2. Soil Fertility
Initially soil in bioretention areas will lack a mature soil profile. It is expected that over time discrete soil
zones referred to as horizons will develop. The development of a soil profile and the individual horizons
is determined by the influence of the surrounding environment including physical, chemical, and
biological processes. Two primary processes important to horizon development are microbial action and
the percolation of water in the soil.
Horizons expected to develop in bioretention areas include an organic layer, followed by two horizons
where active leaching (eluviation) and accumulation (illuviation) of minerals and other substances occur.
The time frame for the development of soil horizons will vary greatly. As an average, soil horizons may
develop within three to ten years. The exception to this is the formation of the organic layer often within
the first or second year, (Brady, 1984).
59

The evaluation of soil fertility in bioretention may be more dependent on the soil interactions relative to
plant growth than horizon development. The soil specified for bioretention is important in filtering
pollutants and nutrients as well as for supplying plants with water, nutrients, and support. Unlike plants
that will become increasingly beneficial over time, the soil will begin to filter the stormwater runoff
immediately. It is expected that the ability to filter pollutants and nutrients may decrease over time,
reducing the soil fertility accordingly. Substances from runoff such as salt and heavy metals eventually
disrupt normal soil functions by lowering the cation exchange capacity (CEC). The CEC, the ability to
allow for binding of particles by ion attraction, decreases to the point that the transfer of nutrients for
plant uptake can not occur. However, the environmental factors influencing each bioretention area will
vary enough that it is difficult to predict for the life span of soils. Findings from other stormwater
management systems suggest an accumulation of substances eliminating soil fertility within five years.
The monitoring of soil development in bioretention areas will help develop better predictions on soil
fertility and development and measures to restore soil fertility.
4.18 Maintenance Guidelines
A schedule of recommended maintenance for bioretention areas is given in Table 4.7. The table gives
general guidance regarding methods, frequency, and time of year for bioretention area maintenance.
1. Planting Soil
Urban plant communities tend to become very acidic due to precipitation as well as the influences of
stormwater runoff. For this reason, it is recommended that the application of an alkaline substance, such
as limestone, be considered once or twice a year. Testing of the pH of the organic layer and soil should
precede the limestone application to determine the amount of limestone required.
Soil testing should be conducted annually so that the accumulation of toxins and heavy metals can be
detected or prevented. Over a period of time, heavy metals and other toxic substances will tend to
accumulate in the soil and the plants. Data from other environs such as forest buffers and grass swales
suggest accumulation of toxins and heavy metals within five years of installation. However, there is no
methodology to estimate the level of toxic materials in the bioretention areas since runoff, soil, and plant
characteristics will vary from site to site.
As the toxic substances accumulate, the plant biological functions may become impaired, and the plant
may experience dwarfed growth followed by mortality. The biota within the soil can, also perish and the
natural soil chemistry may be altered. The preventative measures would include the removal of the
contaminated soil. In some cases, removal and disposal of the entire soil base, as well as the plant
material, may be required.
2. Mulch
Bioretention areas should be mulched once the planting of trees and shrubs has occurred. Any ground
cover specified as plugs may be installed once the area has been mulched. Ground cover established by
seeding and/or consisting of grass should not be covered with mulch.
CiC

Table 4.7 Example Maintenance Schedule for Bioretention Areas
Description
Method
Frequency
Time of
Year
Soil
Inspect and Repair
Visual
Monthly
Monthly .
Erosion
Organic La er
Remulch any void area
By hand
Whenever needed
Whenever
needed
Remove previous mulch
By hand
Once every two or
Spring
layer before applying new
three years
layer (optional)
Any additional mulch
By hand
Once a year
Spring
added
Plants
Remove and replacement
See planting
Twice a year
3/15 to 4/30 and
of all dead and diseased
specifications
10/1 to 11/30
vegetation considered
beyond treatment
Treat all diseased trees
Mechanical or
N/A
Varies, but will
and shrubs
by hand
depend on
insect or disease
infestation
Watering plant material
- By hand
Immediately after
N/A
shall take place at the end
'completion of -
of each day for fourteen
project
consecutive days and
after planting has been
completed
Replacement of support
By hand
Once a year
Only remove
stakes
stakes in the
spring
Replace any deficient -
By hand
Whenever needed
Whenever
stakes or wires
needed
3. Plant Materials
An important aspect of landscape architecture is to design areas that require little maintenance. Certain
plant species involve maintenance problems due to dropping of fruit or other portions of the plant.
Another problem includes plants, primarily trees, that are susceptible to wiudthrow, which creates a
potential hazard to people and property (parked cars). As a result, some plant species will be limited to.
use in low traffic areas.
Ongoing monitoring and maintenance is vital to the overall success of bioretention areas. Annual
maintenance will be required for plant material, mulch layer, and soil layer. A maintenance schedule
should include all of the main considerations discussed. The maintenance schedule usually includes
maintenance as part of the construction phase of the project and for life of the design.
61

Maintenance requirements will vary depending on the importance of aesthetics. Soil and mulch layer
maintenance will most likely be limited to correcting areas of erosion. Replacement of mulch layers may
be necessary every two to three years. Mulch should be replaced in the spring. When the mulch layer is
replaced, the previous layer should be removed first. Plant material upkeep will include addressing
problems associated with disease or insect infestations, replacing dead plant material, and any necessary
pruning.
4.19 Example Soil Specifications for Bioretention Areas
The bioretention areas shall consist of a planting soil having a composition of at least 10 to 25 percent
clay and shall be of a sandy loam or loamy sand texture. Loamy soils may be utilized for the planting
soil but must consist of 35% sand. In addition, the furnished planting soil shall be of uniform
composition, free of stones, stumps, roots or similar objects larger than one inch, brush, or any other
material or substance which may be harmful to plant growth, or a hindrance to planting or maintenance
operations.
The planting soil shall be free of plants or plant parts of Bermuda grass, Quack grass, Johnson grass,
Mugwort, Nutsedge, Poison Ivy, Canadian Thistle or others as specified.
The planting soil shall not contain toxic substances harmful to plant growth.
The planting soil shall be tested and meet the following criteria:
pH range
Organic matter
Magnesium - Mg
Phosphorus -P2O5
Potassium - K2O
Soluble salts .
5.5 - 6.5 ,
1.5 - 3.0%
35 lbs/acre
100 lbs/acre
85 Ibs/acre
not to exceed 500 ppm
The following testing frequencies shall apply to the above soil constituents:
• pH, Organic Matter: 1 test per 90 cubic yards, but not less than 1 test per bioretention area
• Magnesium, Phosphorus, Potassium, Soluble Salts: 1 test per 500 cubic yards, but not less than 1
test per borrow source
• One grain size analysis shall per performed per 90 cubic yards of planting soil, but not less than 1
test per Bioretention Area.
A mulch layer shall be provided on top of the planting soil. An acceptable mulch layer shall include
shredded hardwood or shredded wood chips or other similar material.
Of the approved mulch products, all must be well aged, uniform in color, and free of foreign material
including plant material. Well -aged mulch is defined as mulch, that has been stockpiled or stored for at
least twelve (12) months.
The sand shall be free of deleterious material and rocks greater than 1 inch in diameter.
62

Soil shall be placed in layers less than 18 inches and lightly compacted (minimal compactive effort) by
tamping with a bucket from a dozer or a backhoe.
4.20 Example Plant Specifications for Bioretention Areas
General Planting Specifications
• Root stock of the plant material shall be kept moist during transport from the source to the job site
and until planted.
• Walls of planting pit shall be dug so that they are vertical.
• The diameter of the planting pit must be a minimum of six inches (6") larger than the diameter of the
ball of the tree.
• The planting pit shall be deep enough, to allow 1/4 of the ball to be above the existing grade. Loose
soil at the bottom of the pit shall be tamped by hand.
• The appropriate amount of fertilizer is to be placed at the bottom of the pit (see below for
fertilization rates).
• The plant shall be removed from the container and placed in the planting pit by lifting and carrying
the plant by the ball (never lift by branches or trunk).
• Set the plant upright and in the center of the pit so that the top of the ball is approximately 1/4 above
the final grade.
• Backfill planting pit with existing soil.
• Make sure plant remains straight during backfilling procedure.
• Never cover the top of the ball with soil. Mound soil around the exposed ball.
• Trees shall be braced by using 2" by 2" white oak stakes. Stakes shall be placed parallel to walkways
and buildings. Stakes are to be equally spaced on the outside of the tree ball. Utilizing hose and wire,
brace the tree to the stakes.
Fertilization
• Tree and shrub fertilizer shall be a 21-gm, tightly compressed, long lasting, slow release (2 year)
fertilizer tablet with a minimum guaranteed analysis of 20-10-5:
Total Nitrogen: (N) -20%
Water Soluble Organic Nitrogen -7 %
Water Insoluble Organic Nitrogen - 13%
Available Phosphoric Acid (P205) - 10%a
Soluble Potash (K20) - 5 %
For containerized trees and shrubs, place the specified fertilizer tablet(s) in the bottom of the planting pit
according to the following rates:
1 gal. Container 1 ea. 21 gm. Tablets
3 gal. Container 2 ea. 21 gm. Tablets
5 gal. Container 3 ea. 21 gm. Tablets
7 gal. Container 5 ea. 21 gm. Tablets
X

Planting Non -Grass Ground Cover
• The ground cover planting holes shall be dug through the mulch with one of the following: hand
trowel, shovel, bulb planter, or hoe (this does not apply to grasses or legumes).
• Before planting, biodegradable pots shall be split, and non -biodegradable pots shall be removed.
Root systems of all potted plants shall be split or crumbled.
• The ground cover shall be planted so that the roots are surrounded by the soil below the mulch.
Potted plants shall be set so that the top of the pot is even with the existing grade. The roots of bare
root plants shall be covered to the crown.
• Before planting, apply a pre -emergent herbicide to the mulched and planted ground cover bed.
• The entire ground cover bed shall be thoroughly watered.
Planting Grass Ground Cover
Grasses and legume seed shall be tilled into the soil to a depth of at least 2 inches by either harrowing or
discing. Fertilizer shall be applied at the same rate and utilizing the same process for non -grass ground
cover. Grass and legume plugs shall be planted following the non -grass ground cover planting
techniques.
All ground covers shall be fertilized with a 10-6-4 analysis fertilizer as a wet application at the rate of 3
lbs. per 100 square feet of the bioretention area prior to planting non -grass ground cover or as part of the
grass seed ground cover.
4.21 References
1. 'Brady, N.C. 1984. The Nature and Properties of Soils. MacMillan Publishing Co., New York, New
York.
2. Correll, D. March 20, 1992, Personal communication by PGCDER staff. Smithsonian Environmental
Research Center. Edgewood, Maryland.
3. Correll, D. and Peterjohn, W.T. 1984. Nutrient Dynamics in an agricultural watershed: observations
on the role of a riparian forest, Ecology, 65(5). 1984. pp. 1466 - 1475.
4..Criddle, W.D. 1958. Methods of computing consumptive use of water. Proceedings ASCE, Div.
Irrigation and Drainage 84:1-27.
5. Fernald, M.L., 1950. Gray's Manual of Botany, eighth edition. Dioscorides Press, Portland, Oregon
6. Lindsley, RK.,.Kohler, M.A. and Paulhus, J.L.H., 1958. Hydrology for Engineers, Second Edition,
McGraw-Hill, Inc., 328 pp.
7. Gounin, F., 1992. Personal Communication by PGCDER staff, University of Maryland, College Park,
Maryland, March 17.
8. Hightshoe, G.L., 1988. Native Trees, Shrubs, and Vines for Urban and Rural America. Van Nostrand
Reinhold, New York, New York.
64

9. Maryland Department of Natural Resources (MDNR), Water Resources Administration (WRA), 1984.
"Maryland Standards and Specifications for Stormwater Management Infiltration Practices", Stormwater
Management Division, Tawes State Office Building, Annapolis, Md. 21401. p. 2-23.
10. Metropolitan Washington Council of Governments, 1992. Watershed Restoration Sourcebook:
Collected Papers presented at the 199I Conference; "Restoring our Home River".
11. Moyer, W.J. and R.C. Moyer. 1987. Climate of Upper Marlboro, Maryland, Contribution No. 7571,
and Experiment Station Bulletin No. 13 of the Maryland Agricultural Experimental Station, The
University of Maryland., 69 pp.
12. North Carolina Department of Environment, Health, and Natural Resources, Division of Land
Quality, Raleigh, NC. September 1988. Erosion and Sediment Control Planning and Design Manual.
13. Prince George's County; Department of Environmental Resources (DER), 1991, Stormwater
Management Design Manual., Appendix 4-5, 2 pp.
14. Prince George's County. October 1989. Prince George's County Landscape Manual. Prince George's
County, Maryland.
15. Reed, P.S. Jr., 1988. National List of Species That -Occur in Wetlands: Northeast. United States Fish
and Wildlife Service, St. Petersburg Florida.
16. Schlesinger, W. H. and Waring, R.H. 1985. Forest Ecosystems: Concepts and Management.
Academic Press. Orlando, Florida., pp. 416-418.
17. Schueler, T. 1987. Controlling Urban Runoff: A Practical Manual for Planning and Designing Urban
BMPs. Metropolitan Washington Council of Governments. pp.416 - 418.
18. Tisdale, S.L. and Nelson, W.L., 1975,. Soil Fertility and Fertilizers, Third Edition, Macmillan
Publishing Co., Inc., New York, 694 pp..
19. U.S. Department of Agriculture, Soil Conservation Service, 1986. Urban Hydrology for Small
Watersheds, Engineering Division, Technical Release 55, June, 1986. p 33 .
20. U.S. Environmental Protection Agency (USEPA), 1986. Methodology for Analysis of Detention
Basins for the Control of Urban Runoff Quality, Office of Water Nonpoint Source Branch, Washington,
D.C. 20460, EPA440/5-87-001. pp.,A-5 - A40.
65

5 O Grassed Swales
5.1 Introduction
Grassed swales are shallow trapezoidal or parabolic earthen channels covered with a dense growth of a
hardy grass such as Reed Canary or Tall Fescue. Grassed swales are sometimes classed as a type of
biofilter because the vegetation on the swale takes up some pollutants and helps filter sediment and other
solid particles out of the runoff. These channels convey stormwater and provide some stormwater
management for small storms by retarding peak flow rates, lowering velocities of runoff and by infiltrating
runoff water into the soil. Swales are used primarily in single-family residential developments, at the
outlets of road culverts, and as highway'medians.
Enhanced grassed swales are ordinary swales with small check dams and wide basins along their course
(Schueler, et al 1992). The check dams and the wide areas create small. pools of water, which slow the
water's flow, encourage the water to infiltrate into the soil and enhance pollutant removal. Figure 16
shows an example of an enhanced grass swale.
The Erosion and Sediment Control Planning and Design Manual for North Carolina describes the process
of swale design in detail, and the designer should consult it for general design and vegetation ,
specifications. When a swale is designed and installed for the purpose of water quality protection in
addition to the basic purpose of transporting stormwater, the design velocities are lower. The
requirements for reduced velocities are to allow a greater contact time with the vegetation and to allow
for more infiltration.
Grassed Swales have a long history of use for stormwater conveyance, and they normally provide long-
term water quality protection. However, because of their limited pollutant removal ability, grassed Swales
are not a sufficient means to reach the 85% TSS removal requirement. They can be used as one of a series
of BMPs that when combined with other BMPs can provide sufficient protection to surface waters. An
example would be a development that used a combination of grassed swales and extended dry detention to
achieve the required 85% TSS removal. For the purposes of satisfying the requirements for stormwater
treatment found in NCAC 15A 2H.1000, a properly designed and constructed grass swale is assumed to
have a TSS removal of 35%.
5.2 General Characteristics
Grassed swales have had mixed results in removing particulate pollutants such as sediment and trace
metals. They are generally unable to remove significant amounts of soluble plant nutrients. Swales have
proven to be very reliable with few failures. However, formation of gullies or thinning of the vegetative
cover will reduce pollutant removal and cause the swale to fail as a pollutant -removing device.
5.3 Advantages
The primary advantages of grassed swales include relatively low construction and maintenance costs,
increased infiltration, additionalwildlife habitat in some cases, elimination of curbs and gutters which
collect and deliver pollutants to receiving waters, and a pleasing appearance. In areas with low amounts of
66

impervious surface, such as single-family residential areas, curbs and gutters can be replaced by swales,
resulting in increased stormwater pollutant removal and improved aesthetics.
5.4 Disadvantages
Disadvantages of swales include limited pollutant removal, increased nutrient concentrations in runoff due
to fertilization of the grass in the swales, and standing water, which may cause safety, odor and/or
mosquito problems.
5.5 costs
Swales cost less to construct than curbs, gutters, and underground pipes; however, swales take up more
land area. The costs of maintaining swales are usually minimal. However, special maintenance such as
extensive sediment removal or erosion repair may become expensive.
5.6 Design Requirements
• Longitudinal slope should be in the range of 2 to 4%. If 'slope along the flow path exceeds 4%,
then checkdams must be installed to reduce the effective slope to below 4%.
• Side slopes should be no greater than 3:1 horizontal to vertical.
• Maximum runoff velocity should be 2 fps for the peak runoff of the 2-year storm.
• Design must also nonerosively pass the peak runoff rate from the 10-year storm.
• . Length of swale shall be at least 100 feet per acre of drainage area.
• A vegetation plan shall be prepared in accordance with the recommendations found in the Erosion
and Sediment Control Planning and Design Manual.
• Swales should be stabilized within 14 days of swale construction.
Other general recommendations for design and construction of grassed swales for pollutant removal are:
• Swales should be constructed on permeable, noncompacted soils.
• Swales should be sited in areas where the seasonal high water table is at least one foot below the
bottom of the swale.
• Swales should not carry dry -weather flows or constant flows of water; and
• Swales should have short contact times or short grass height.
5.7 Maintenance
Swale maintenance basically involves normal grass management activities such as mowing and resodding
when necessary and periodic sediment removal, if significant deposition occurs. Maintenance shall be
performed as follows:
• At least once annually, remove excess sediment, especially from the upstream edge, to maintain
original contours and grading.
68

At least once annually, repair any erosion and regrade the swale to ensure that the runoff flows
evenly in a thin sheet through the swale.
At least once annually, inspect vegetation and revegetate the swale to maintain a dense growth of
vegetation.,
Grassed swales shall be mowed at least twice annually to a maximum height of six inches.
5.8 References
1. Arnold, J.A., ed. D.E. Line, S.W. Coffey, and J. Spooner. 1993. Stormwater Management Guidance
Manual. North Carolina Cooperative Extension Service and North Carolina Division of Environmental
Management. Raleigh, NC
2. Berman, Laurel, C. Hartline, N. Ryan, and J.D. Thorne, P.E. 1991. Urban Runoff: Water Quality
Solutions. The American Public Works Association Research Foundation. 58 pp.
3. Birch, P.B., Ph.D. and H.E. Pressley (eds.) 1992. Stormwater Management Manual for the Puget
Sound Basin. Review Draft. Dept. of Ecology. Publication number 90-73.
4. Gibb, A., B. Bennett, and A. Birkbeck. 1991. Urban Runoff Quality and'Treatment: A Comprehensive
Review. File number 2-51-246(242). British Columbia Research Corporation. Vancouver, British
Columbia.
5. North Carolina Department of Environment, Health, and Natural Resources, Division of Land Quality,
Raleigh, NC. September 1988. Erosion and Sediment Control Planning and Design Manual.
6. Schueler, T.R., P. A. Kumble, and M. A. Heraty. 1992. A Current Assessment of Urban Best
Management Practices: Techniques for Reducing Non -Point Source Pollution in the Coastal Zone.
Publication number 92705. Metropolitan Washington Council of Governments. Washington, DC. 127 pp.
7. Schueler, T.R. 1987. Controlling Urban Runoff: A Practical Manual for Planning and Designing
Urban BMPs. Publication number 87703. Metropolitan Washington Council of Governments.
Washington, DC. 275. pp.
8. Stahre, P. and B. Urbonas. 1990. Stormwater Detention For Drainage, Water Quality, and CSO
Management. Prentice Hall, Inc. Englewood Cliffs, NJ. 338 pp.
9. U.S. EPA. 1990. Urban Targeting and BMP Selection. Information and Guidance Manual for State
Nonpoint Source Program Staff Engineers and Managers. The Terrene Institute. EPA No. 68-C8-0034.
54 pp.
10. U.S. EPA. 1992. Stormwater Management for Industrial Activities: Developing Pollution Prevention
Plans and Best Management Practices. Office of Water. Government Institutes, Inc. Rockville, MD.
11. Urbonas, B. and L.A. Roesner, eds. 1986. Urban Runoff Quality —Impact and Quality Enhancement
Technology. American Society of Civil Engineers. New York, NY. 477 pp.
69

12. Whipple, W., N.S. Grigg, T. Grizzard, C. W. Randall, R. P. Shubinski, and L. S. Tucker.
1983. Stormwater Management in Urbanizing Areas. Prentice Hall, Inc. Englewood Cliffs, NJ.
234 pp.

6 0 Extended Dry Detention Basins
r .FY.^I :
6.1 Introduction
Dry detention basins are also called dry ponds, dry detention ponds and detention basins. These basins
have been the workhorse for control of stormwater peak flows in other states and in some areas of North
Carolina for years; hence, there is a fair body of knowledge to assist in their design and operation. Their
use as a water quality BMP is less well understood, and what data exists seems to suggest that basins
designed only for peak flow attenuation do not provide significant water quality benefits. Extended dry
detention basins are similar to conventional dry basins, but provide for a longer detention time for a more
frequent storm. Figure 17 shows an example of an extended dry detention basin.
The conventional design of dry detention basins is to simply hold or detain stormwater for a short
interval of time, at least 24 hours, to reduce the peak flows in the receiving water. The basin should dry
out between storms. Primary design,values for detention basins are the detention time (which is the
amount of time the stormwater is held in the basin before being discharged) and the basin volume (which
determines the amount of runoff that can be held for the desired length of time).
With the present emphasis on improving stormwater quality, new basins are designed to remove
pollutants and existing basins can be modified to enhance pollutant removal. Extended dry detention
basins designed according to the criteria provided herein are assumed to achieve a 50% TSS removal
rate. Since dry detention basins have not been demonstrated to provide the level of pollutant removal
that is required under 15A NCAC 2H.1000 they must be used in combination with other BMPs such as
grassed swales to achieve 85%TSS removal.
6.2 Advantages
Dry detention basins are usually not limited by terrain or soils. They provide excellent streambank
erosion protection and treatment of stormwater when used in combination with other stormwater control
practices such as wetlands or when retrofitted with permanent pools. Modified dry basins can provide
wetlands and wet meadows for animal habitat if the basins incorporate permanent pools and proper
landscaping.
6.3 Disadvantages
Dry extended detention basins are usually considered unattractive by residents. Poorly maintained basins
can create nuisance odors, breed insects and collect trash. Poorly located basins can -remove valuable
animal habitat and degrade streams and forests. Dry basins require a fair amount of land area, depending
on the terrain of the land and are normally placed where they cannot be easily seen as most residents
consider them unattractive.
71

Small
to cone
flow Into
Slormwater
inlet
Riprapinlet
protection Outlet riser
Slormwater detention level '
_ .�a.. '3 .0• 'gyp i 1:r
r.
Wildflowers temporarily flooded Perforated riser for controlled
release of stomnwater
Compacted -earth
embankment
Ouflel
protection
Anti -seep collar

6.4 Costs
Detention basins are inexpensive compared to other stormwater control practices when only construction
costs are considered. If land costs are high, then they can become one of the more expensive stormwater
BMPs. Maintenance costs are higher than many other practices.
6.5 Design Requirements
• Extended dry detention basins capture the runoff from the 1-year 24-hour storm and release it over a
period of 48 hours or capture the runoff from the 1 inch storm and allow it to draw down over a
period of 2 to,5 days.
• Minimum flow length to width ratio of 3:1. .
• Side slopes of the pond should be no steeper than 3:1 horizontal to vertical.
• Extended detention basins must include a small permanent pool near the outlet orifice to reduce
clogging and keep floating debris away from the outlet.
• Cleanout access must be provided that is sufficient for heavy machinery.
• There must be a drain that will completely empty the basin for cleanout..
• Any additional peak flow control that the local government requires must be met.
• There must be vegetation plan prepared by a NC licensed professional. Consideration must be given
to the grasses specified due to the frequent inundations.
• The basin must be stabilized with 14 days of construction. This might be in the form of final
vegetation, or a temporary means of providing stabilization until the vegetation becomes established.
• If the basin was used during construction as a sediment basin or trap, then the basin must be cleaned
out, graded, and vegetated within.14 days of the completion of construction.
• In addition to the detention volume, the design must provide. for the sediment storage that is equal to
2M of the detention volume.
• Inlet and outlet channels should be protected from scour during high flows from large storms.
Standard erosion control measures work very well. The Land Quality Section of the North Carolina
Department of Environment and Natural Resources and the US Department of Agriculture Natural
Resource Conservation, Service (SCS) can provide valuable information on erosion and sediment
control techniques.
The previous illustration, Figure 17, shows a cross-section of an extended detention pond that would
meet the above criteria. It shows the use of an inverted pipe orifice that is submerged in the small
permanentpool. This allows a more consistent prediction of drawdown time, and provides some
protection from clogging.
6.6 Additional Design Considerations:
Sediments can be resuspended by the incoming runoff. Therefore it is recommended that there be
either an additional plunge pool at the inlet of the basin or sufficient measures such as riprap to
disperse the energy.
A forebay to capture sediment can minimize cleanout problems. It is a good idea to provide adequate
access for equipment to be used for cleanout. Also, paving or flexible revetment in the,forebay can
allow for rapid access and quick sediment removal by heavy equipment.
73

• Consideration should be given to the soil type of the site of the basin. Uncompacted, natural soils
will provide the best media for vegetation and will introduce less sediment in the incoming water.
• The seasonal, high water table should be at least 1 foot below the bottom of the extended dry
detention basin.
6.7 Maintenance
Dry basins require frequent mowing and unclogging of outlets. Poorly designed basins with steep side
slopes may be hazardous to mow with power equipment creating difficult and/or expensive maintenance.
Trash, debris and sediment accumulation is rapid in most basins, requiring frequent cleaning.
Detention basins usually do not normally fail structurally; however, many dry detention basins are not
functioning as designed mainly because they do not empty completely between storms. This reduces the
effective storage volume and detention time for incoming storm flows.
Maintenance Requirements are as follows:
• All grassed areas of an extended dry detention basin should be mowed at least twice annually.
• .Extended dry detention basins will tend to collect debris, and it should be removed whenever.it
accumulates, or at least twice annually.
• The basin should be inspected annually after a rain event to ensure that it is operating as designed.
• At a minimum, items that should be included in the annual inspection and addressed are:
1. clogging of the outlet or too rapid a release,
2. erosion on the banks,
3. erosion at the inlet and outlet,
4. sediment accumulation and the need for removal,
5. condition of the emergency spillway, and
6. woody vegetation in the embankment.
6.8 Peak Flow Reduction
Dry detention basins are normally used to reduce peak flows from storms of varying recurrence
frequency.. Their pollutant removal potential is enhanced when used in conjunction with permanent
pools, wetlands, etc.
6.9 References
1. Arnold, J.A., ed. D.E. Line, S.W. Coffey, and J. Spooner. 1993. Stormwater Management Guidance
Manual. North Carolina Cooperative Extension Service and North Carolina Division of Environmental
Management. Raleigh, NC
2. Berman, Laurel, C. Hartline, N. Ryan, and I.D. Thome, P.E. 1991. Urban Runoff Water Quality
Solutions. The American Public Works Association Research Foundation. 58 pp.
3. Birch, P.B. Ph.D. and H.E. Pressley (eds.) 1992. Stormwater Management Manual for the Puget
Sound Basin. Review Draft. Dept. of Ecology. Publication number 90-73.
74

4. Gibb, A., B. Bennett, and A. Birkbeck. 1991. Urban Runoff Quality and Treatment: A Comprehensive
Review. File number 2-51-246(242). British Columbia Research Corporation. Vancouver British
Columbia.
5. North Carolina Department of Environment, Health, and Natural Resources, Division of Land Quality,
Raleigh, NC. September 1988. Erosion and Sediment Control Planning and Design Manual.
6. Shueler, T.R., P.A. Kumble, and M.A. Heraty. 1992. A Current Assessment of Urban Best
Management Practices: Techniques for Reducing Non -Point Source Pollution in the Coastal Zone.
Publication number 92705. Metropolitan Washington Council of Governments. Washington, D.C. 127
PP.
7. Shueler, T. R. 1987. Controlling Urban Runoff: A Practical Manual for Planning and Designing
Urban BMPs. Publication number 87703. Metropolitan Washington Council of Governments,
Washington, D.C. 275 pp.
8. Stahre, P. and B. Urbonas. 1990. Stormwater Detention For Drainage,' Water Quality and CSO
Management. Prentice Hall, Inc. Englewood Cliffs. NJ. 338 pp.
9. U.S. EPA. 1990. Urban Targeting and BMP Selection. Information and Guidance Manual for State
Nonpoint Source Program Staff Engineers and Managers. The Terrene Institute. EPA No. 68-C8-0034.
54 pp.
10. U.S. EPA. 1992. Stormwater Management for Industrial Activities:, Developing Pollution Prevention
Plans and Best Management Practices. Office of Water. Government Institutes, Inc. Rockville, MD.
11. Urbonas, B. and L.A. Roesner, eds. 1986. Urban Runoff Quality — Impact and Quality Enhancement
Technology. American Society of Civil Engineers. New Yoik, NY. 477 pp.
12. Whipple, W., N.S. Gregg, T. Grizzard, C. W. Randall, R.P. Shubinski, and L.S. Tucker. 1983.
Stormwater Management in Urbanizing Areas. Prentice Hall, Inc. Englewood, Cliffs. NJ. 234 pp.
75

7.0 FiIter Strips
7.I Introduction
Filter strips are sections of vegetation designed to reduce pollutants in stormwater runoff before the runoff
enters a stream or other receiving water. Filter strips are carefully designed and constructed strips of
relatively flat, level land with grasses or other vegetation and some method to spread the stormwater
runoff into a thin sheet. If planted with grass, filter strips are sometimes called grass filter strips. Figure
18 illustrates an example of a forested filter strip with level spreader.
Another type of vegetative practice is the buffer zone or buffer strip, which is a strip of vegetation that has
not been disturbed during development or has been planted along a stream or other area to be protected.
Buffer zones differ from filter strips in that the land surface is not as level and there are no level spreaders
or other constructed devices to spread the stormwater runoff into thin sheet flow.
Many types of plants or natural vegetation can be used in filter strips ranging from close -growing grasses
to shrubs and trees. These vegetated strips work best if a level spreader is constructed along the top edge
of the filter strip. One type of level spreader is a stone -filled shallow trench with the top edge of its lower
bank exactly level. The crushed stone in the level spreader slows the stormwater and the level lower side
makes it flow out in a thin sheet onto the filter strip. A'concrete berm may also be used as a level
spreader.
These devices are used between upstream development and streams or ponds, primarily in residential
areas or where the development density is low. Additionally, North Carolina rules require a filter strip to
be used to further treat the stormwater discharged from wet detention ponds. Because of their limited
pollutant removal ability, filters are not a sufficient means by themselves to reach the 85% TSS removal
requirement, but they can be used as one of a series.of BMPs that, when combined, will provide sufficient
protection to surface waters.
Properly constructed forested and grassed filter strips can be expected to remove a minimum of 35 percent
of the solids and 40 percent of the nutrients in urban runoff. There is some indication that forested strips,
or strips that use trees, appear to be more effective than grass strips because of their greater uptake and
longer -term retention of plant nutrients such as nitrogen and phosphorus. However, the designer should
remember that significant flow channelization in the strip can drastically reduce,a strip's pollutant
removal and that filter strips exhibit highly varying effectiveness from site to site.
Filter strips remove pollutants from runoff by the filtering action of the vegetation, infiltration of
pollutant -carrying water and sediment deposition. The removal rate depends on many factors, including
runoff velocity and degree of channelization, soil permeability, vegetation type, flow length and slope of
the strip.
Improper design, location or maintenance of filter strips can lead to early failure. The formation of
channels or gullies or too -sparse vegetative cover can drastically reduce the pollutant removal of a filter.
Filter strips require regular maintenance to ensure that the, incoming stormwater flow is spread thinly over
the entire filter strip and that the vegetation remains dense and vigorous.
76

gyn'll� liln� a u
�u l<
2sd Will
i7� n•abuts level spreader Forested filter CA
Slone -filled trench
level spreader
Grasse Slope of strip
filter stri toward stream
is 5% or less Stream
to
_ ,�•_ {-, ��. = r�•rY:'.`1�Y'L�vl}4' i�, +'�+ �l iu,��11�71��. fd����`.. _
;:,.

7.2 Advantages
Filter strips can be effective at reducing particulate pollutants such as sediment, organic matter. and many
trace metals. Filter strips mesh well in residential areas where they provide open space for recreational
activities, help maintain the riparian zones along streams, reduce streambank erosion and provide animal
habitat.
7.3 Disadvantages
Since filter strips, are not designed to handle high velocity flows, they should generally only be used in
areas with less intense development. Also, because filter strips do not provide enough runoff storage or
infiltration to significantly reduce peak discharges or the volume of storm runoff, they should be viewed
as only one component in a stormwater management system.
7.4 Costs
The cost of establishing filter strips is usually low, requiring only minor grading and the expense of
establishing vegetation. Routine maintenance activities such as inspection, sediment. removal, reseeding,
and removing debris are also inexpensive; however, if the strip accumulates a large volume of sediment or
if concentrated flow erodes a channel through the strip, reconstruction costs may be substantial.
7.5 Physical Requirements
To prevent concentrated flows from forming, the drainage area contributing to the filter strip should be
less than five acres and could be less, depending on watershed slope, rainfall intensities, and degree of
imperviousness. Filter strips should not be used on slopes greater than 15% or in areas where vegetation
cannot be maintained all year. Best performance occurs where the slope is 5% or less. Because they
cannot handle high peak runoff rates, they are not suitable in relatively impervious areas such as
downslope of large buildings and parking lots.
Filter strips are most effective when they are level in the direction stormwater flows over the strip, which
is toward the stream This shape encourages the stormwater to flow in a thin sheet over the strip and
through the vegetation, which is best for infiltration of water into the soil and filtering of sediment and
other solid particles. Deep flows or concentration of flow into channels reduces the effectiveness of the
strip.
7.6 Design Requirements.
• Filter strips must be 50 feet in length along the direction of flow for filter strips up to 5% slope.
• Filter strips must be 50 feet plus 4 feet for every 1% increase in slope up to d maximum of 15%.
• Width of filter perpendicular to flow must be 100 feet for each acre of drainage area.
• Velocity of flow must be under 2 fps for the maximum flow resulting from a 10-year storm
• Design must include a device such as a level spreader to allow runoff to enter the filter strip as sheet
flow.
78

• Maximum drainage areas flowing to individual filters shall be less than or equal to 5 acres.
• If the filter strip will be used during construction, the area must be stabilized within 14 days.
• A grading and vegetation plan must be prepared by a licensed professional.
The vegetation plan is an important aspect of the design of filter strips and will help to determine the
actual amount of pollutants removed. As has been mentioned before, a natural forested area provides the
best long-term removal of pollutants, and priority should be given to preventing the unnecessary removal
of trees. This is especially true when the area can be demonstrated to nonerosively receive the runoff
from the developed areas. If a constructed area must serve as filter strip, then the guidelines established in
the Erosion and Sediment Control Planning and Design Manual, Chapters 3, 6.11-6.14, and 8.02 must be
followed.
The following pollutant removal credit will be given for filter strips that meet the previously described
design criteria:
40% TSS removal - for filters strips that are primarily natural, woody vegetation
30% TSS removal - for filter strips that are planted with primarily woody vegetation
25%a TSS removal - for filter strips that are planted in grass or legumes
7.7 Maintenance
Most filter strips fail in a short period of time because of poor design or poor maintenance (Schueler, et al
1992). With minimal maintenance filter strips can be effective indefinitely; however, strips that are not
maintained properly may quickly become nonfunctional. Filter strip maintenance basically involves
normal grass or shrub -growing activities such as mowing, trimming, or replanting when necessary. Strips
that.are used for sediment removal may require periodic regrading and reseeding of their upslope edge
because deposited sediment can kill grass and change the elevation of the edge such that the stormwater
no longer flows through the strip in thin sheets. Maintenance requirements are as follows:
• At least once annually, remove deposited sediment, especially from the upstream edge, to maintain
original contours and grading.
• Repair channels that form and regrade the filter strip to ensure that the runoff flows evenly in a thin
sheet over the filter strip.
• Repair level spreader whose disrepair can cause the formation of channels in the filter strip.
• Reseed and regrade the filter strip to maintain a dense growth of vegetation, especially if the strip has
been used for sediment control (Schueler, et al. 1992).
• 'Grassed filter strips shall be mowed at least twice annually to a maximum height of six. inches.
Filter strips should perform well in all areas of North Carolina where a dense, vegetative growth can be
established. High -dune areas in the coastal counties are too dry to establish dense vegetation and should
be avoided when locating filter strips.
7.8 Peak Flow Reduction
Filter strips have limited ability to reduce peakstormwater flows. Their best use is to reduce pollutants in
combination with other stormwater control practices such as dry detention basins, wet detention ponds,
79

infiltration devices and wetlands. They will tend to lengthen the time of concentration for most storms,
and this should be taken in account when the design must also meet local peak flow requirements.
7.9 References
1. Arnold, J.A., ed. D.E. Line, S.W. Coffey, and J. Spooner. 1993. Stormwater Management Guidance
Manual. North Carolina Cooperative Extension Service and North Carolina Division of Environmental
Management. Raleigh, NC.
2. Berman, Laurel, C. Hartline, N. Ryan, and J.D. Thome, P.E. 1991. Urban Runoff: Water Quality
Solutions. The American Public Works Association Research Foundation. 58 pp.
3. Birch, P.B., Ph.D. and H.E. Pressley (eds.) 1992. Stormwater Management Manual for the Puget
Sound Basin. Review Draft. Dept. of Ecology. Publication number 90-73.
4. Gibb, A., B: Bennett,, and A. Birkbeck. 1991. Urban Runoff Quality and Treatment: A Comprehensive
Review. File number 2-51-246(242). British Columbia Research Corporation -Vancouver, British
Columbia.
5. North Carolina Department of Environment, Health, and Natural Resources, Division of Land Quality,
Raleigh, NC. September 1988. Erosion and Sediment Control Planning and Design Manual.
6. Schueler, T.R., P. A. Kumble, and M. A. Heraty. 1992. A Current Assessment of Urban Best
Management Practices: Techniques for Reducing Non -Point Source Pollution in the Coastal Zone.
Publication number 92705. Metropolitan Washington Council of Governments. Washington, DC. 127 pp.
7. Schueler, T.R. 1987. Controlling Urban Runoff: A Practical Manual for Planning and Designing
Urban BMPs. Publication number 87703. Metropolitan Washington Council of Governments.
Washington, DC. 275 pp.
8. Stahre, P. and B. Urbonas. 1990. Stormwater Detention For Drainage, Water,Quality, and CSO
Management. Prentice Hall, Inc. Englewood' Cliffs, NJ. 338 pp.
9. U.S. EPA. 1990. Urban Targeting and BMP Selection. Information and Guidance Manual for State
Nonpoint Source Program Staff Engineers and Managers. The,Terrene Institute. EPA No. 68-C8-0034
54 pp.
10. U.S. EPA. 1992. Stormwater Management for Industrial Activities: Developing Pollution Prevention
Plans and Best Management Practices. Office of Water. Government Institutes, Inc. Rockville, MD.
11. Urbonas, B. and L.A. Roesner, eds. 1986. Urban Runoff Quality —Impact and Quality Enhancement
Technology. American Society of Civil Engineers. New York, NY. 477 pp.
12. Whipple, W., N.S. Grigg, T. Grizzard, C. W. Randall, R. P. Shubinski, and L. S. Tucker. 1983.
Stormwater Management in Urbanizing Areas. Prentice Hall', Inc. Englewood Cliffs, NJ. 234 pp.
80

8.0 Infiltration Devices
t: v:;: ,,?..
8.1 Introduction
Infiltration refers to the process of stormwater entering the soil. A number of infiltration devices with
differing designs have been used in various locations throughout the country. This chapter discusses only
three devices: infiltration basins, infiltration trenches, and dry wells.
Infiltration basins are normally dry basins, much like dry detention basins, with the exception that the
stormwater does not flow out into a receiving stream Rather, the stormwater is allowed to exfiltrate, or
exit the basin by infiltrating into the soil. Obviously, infiltration basins can be used only where the soils
are permeable enough to empty the basins within a reasonable time interval. Figure 19 shows an
example of a traditional infiltration basin.
Infiltration trenches are ditches that fill with stormwater runoff and allow the water to exfiltrate into the
soil. Some versions of infiltration trenches are filled with large crushed stone to create storage for the.
stormwater in the voids between the stones. Other versions use precast concrete chambers to provide a
large storage volume to hold stormwater for exfiltration into the soil. Infiltration trenches are usually
used to handle the water from parking lots and buildings.
Dry wells are constructed similarly to infiltration trenches but are usually more compact and not
elongated. Dry wells are most useful for receiving the runoff from roofs of buildings and allowing it to
exfiltrate into the soil. Dry wells that receive runoff from either roofs or completely impervious areas
show the most promise for long-term water quality benefit.
North Carolina rules permit the use of infiltration practices in the coastal counties and as an alternative
practice in other areas to satisfy the requirement for 85% TSS removal. Infiltration devices must meet
the design requirements discussed here, of which the geotechnical investigations are an important part.
Infiltration devices are thought to have high removal efficiencies of sediment and pollutants that are
adsorbed to sediment particles. Biological degradation in the soil should help reduce dissolved pollutants,
depending on soil type. Data is available on actual removal capability, for most dissolved pollutants.
At present, many infiltration devices seem to fail rather quickly. It appears that the soil becomes clogged
with sediment, preventing infiltration. Newer designs are incorporating enhancements to. remove more
sediment before the sediment enters the infiltration device. Regular maintenance and proper siting will
extend the life of an infiltration device.
8.2 Advantages
Infiltration devices put more stormwater into the soil, which more closely mimics the natural hydrology
of the area. Increasing the amount of water entering the soil reduces the frequency of flooding and helps
to maintain the shallow ground water that will support dry weather flows in streams. In general, pollutant
removal should be as good as the best stormwater control practices.
81

PON
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Velocity dissipation
-
blocks and flow spreader
{�
water
urface
y
el
surface elevation
Riprap inlet Sand filter
flow spreaders
Dense grass cover,
-+y '�"`^ •,r� Intel
l
�
Perforated pipe filter
H
6
underdrains carry
'runoff water to basin
y
I
R
E
R
g
N

8.3 Disadvantages
A problem associated with the past high failure rate is that when a BMP fails, the stormwater receives
little treatment. Also, devices which use infiltration are restricted to those areas with permeable soils,
deep water tables, deep bedrock and stable areas where the stormwater contains little sediment. The
greatest potential concern about infiltration practices is that infiltration of stormwater may contaminate
ground water. To date, no major contamination has occurred (Schueler, et al. 1992).
8.4 Costs
Infiltration devices are less expensive'than large wetlands, but more expensive than a simple dry
detention basin. Given that infiltration devices can often fit into areas with limited space, they may be the
most cost-effective control available in some situations. Also, -there are situations where an infiltration
device may be constructed beneath an impervious surface, thereby consuming no developable land.
8.5 Design Requirements
• Soils must be tested and shown to infiltrate a minimum of 0.52 inchesthour at the bottom of the
device.
• Infiltration devices must capture and infiltrate the runoff from first 1.5 inches of rainfall for areas
that drain to SA classified waters, and 1.0 inch of rainfall in all other areas.
• Drawdown of this runoff must occur within 5 days.
• The maximum drainage area that should flow to a single device is 5 acres.
• Pretreatment devices such as catch basins, grease traps, filter strips, grassed swales and sediment
traps must be used to protect infiltration devices from clogging.
• All infiltration devices should be sited a minimum of 30 feet from surface water, 50 feet from Class
SA waters, and 100 feet from any water supply wells.
• The bottom of the infiltration device should be a minimum of 2 feet above the seasonal high water
table, with greater separation desirable.
• The bottom of the infiltration device must be a minimum of 3 feet above any bedrock or impervious
soil horizon.
• The bottom of the device must be lined with a layer of clean sand with an average depth of four
inches..
• The sides of an infiltration trench must be lined with geotextile filter fabric.
• The rock used in infiltration trenches must be free of fines (washed stone) and have as large a void
ratio as possible. Rounded stone, such as beach gravel, has a larger void ratio than angular crushed
stone.
• Infiltration devices must be designed as off-line BMPs. This means that runoff in excess of the
design volume by-passes.the system.
• Infiltration devices should not be constructed on fill material, but may be allowed on a case -by -case
basis.
• At least one observation well should be included in the design of an infiltration device and may be
required on a case -by -case basis.
• Runoff should not be directed to an infiltration device until the drainage area is stabilized.
83

- Other Design Guidelines:
• Infiltration devices work best for smaller drainage areas and drainage areas that are completely stable
or impervious.
• Thick vegetation on the bottom of infiltration basin should be maintained.
• Infiltration trenches should be wide and shallow rather than deep and narrow. The ratio of side -to -
bottom area should be less than 4:1. The sides and bottom should be lined with filter fabric
(geotextile fabric) to prevent clogging. -
• Infiltration devices should be located away from foundations of buildings and other.sensitive
structures.
Failure rates for infiltration devices appear to be high. Schueler cites studies which indicate that only
about half of the infiltration trenches and even fewer infiltration basins functioned as long as five years
(Schuelei, et al. 1992). Many of these devices failed due to clogging and lack of maintenance.
8.6 Peak Flow Reduction
Infiltration devices are used to improve the quality of the stormwater and are not primarily directed to
reducing peak flows or stormwater volume, especially from larger storms that are bypassed around the
system However, because they prevent some water from running off, they will reduce the peak flows.
8.7 Maintenance
While there should be little routine maintenance needed for most infiltration devices, the maintenance
that is required is very important, and property owners must be educated in the function and maintenance
requirements of the infiltration device. Especially important is the maintenance of vegetated areas that
drain to the infiltration system Areas that are allowed to become bare and unvegetated will contribute
excess sediment to the infiltration system and hasten its failure.
Maintenance Requirements:
• Annual inspections must be conducted after a storm event to ensure infiltration performance.
• Grass filters leading to infiltration basins should be mowed at least twice a year.
• Sedimentdeposits should be removed from pretreatment devices at least annually.
• Removal and reconstruction of the infiltration device will be necessary when the infiltration rate
drops to unacceptable levels.
8.8 References
1. Arnold, J.A., ed. D.E. Line, S.W. Coffey, and J. Spooner. 1993. Stormwater Management Guidance Manual.
North Carolina Cooperative Extension Service and North Carolina Division of Environmental Management.
Raleigh, NC
2. Berman, Laurel, C. Hartline, N. Ryan, and J.D. Thome, P.E. 1991. Urban Runoff: Water Quality
Solutions. The American Public Works Association Research Foundation. 58 pp.
84

3. Birch, P.B., Ph.D. and H.E. Pressley (eds.) 1992. Stormwater Management Manual for the Puget
Sound Basin. Review Draft. Dept. of Ecology. Publication number 90-73.
4. Gibb, A., B. Bennett, and A. Birkbeck. 1991. Urban Runoff Quality and Treatment: A Comprehensive
Review. File number 2-51-246(242). British Columbia Research Corporation. Vancouver, British
Columbia.
5. North Carolina Department of Environment, Health, and Natural Resources, Division of Land Quality,
Raleigh, NC..September 1988. Erosion and Sediment Control Planning and Design Manual.
6. Schueler; T.R., P. A. Kumble, and M. A. Heraty. 1992. A Current Assessment of Urban Best "
Management Practices: Techniques for Reducing Non -Point Source Pollution in the Coastal Zone.
Publication number 92705. Metropolitan Washington Council of Governments. Washington, DC. 127 pp.
7. Schueler, T.R. 1987. Controlling Urban Runoff: A Practical Manual for Planning and Designing
Urban BMPs. Publication number 87703. Metropolitan Washington Council of Governments.
Washington, DC. 275 pp.
8. Stahre, P. and B. Urbonas. 1990. Stormwater Detention For Drainage, Water Quality, and CSO
Management. Prentice Hall, Inc. Englewood Cliffs, NJ. 338 pp.
9. U.S. EPA. 1990. Urban Targeting and BMP Selection. Information and Guidance Manual for State
Nonpoint Source Program Staff Engineers and Managers. The Terrene Institute. EPA No. 68-C8-0034.
54 pp.
10. U.S. EPA. 1992. Stormwater Management for Industrial Activities: Developing Pollution Prevention
Plans and Best Management Practices. Office of Water. Government Institutes, Inc. Rockville, MD.
11. Urbonas, B. and L.A. Roesner, eds. 1986. Urban Runoff Quality —Impact and Quality Enhancement
Technology. American Society of Civil Engineers. New York, NY. 477 pp.
12. Whipple, W., N.S. Grigg, T. Grizzard, C., W. Randall, R. P. Shubinski, and L. S. Tucker. 1983.
Stormwater Management in Urbanizing Areas. Prentice Hall, Inc. Englewood Cliffs, NJ. 234 pp.
85

TOWN OF NEWPORT
NPDES STORMWATER PERMIT
APPLICATION FORM

State of North Carolina OFFIC USE ONLY
Department of Environment & Natural Resources Date Rec'd
Division of Water Quality Fee Paid
Permit Number
NPDES STORMWATER PERMIT APPLICATION FORM
This application form is for use by public bodies seeking NPDES stormwater permit coverage for Regulated Public
Entities (RPE). pursuant to Title 15A North Carolina Administrative Code 2H .0126. A complete application
package includes this form and three copies of the narrative documentation required in Section X of this form.
This application form, completed in accordance with Instructions for completing NPDESSmall MS4Stormwater
PermitAppiication (SWU-270) and the accompanying narrative documentation, completed in accordance with
Instructions for Preparing the Comprehensive Stormwater Management Program Report (SWU Z68) are both
required for the application package to be considered a complete application submittal. Incomplete application
submittals may be returned to the applicant.
I. APPLICANT STATUS INFORMATION
a.
Name of Public Entity
Seekin Permit Coverage
Town of Newport
b.
Ownership Status (federal,
state or local
Local
c.
Type of Public Entity (city,
town, county, prison, school,
etc.
Town
d.
Federal Standard Industrial
Classification Code
SIC 91 - 97
e.
County(s)
Carteret
f.
Jurisdictional Area (square
miles
29
g.
Population
Permanent
3,346 Source: US Census Bureau
Seasonal (if available)
h.
Ten-year Growth Rate
33% Source: US Census Bureau (1990-2000)
i.
Located on Indian Lands?
Yes ® No
II. RPE / MS4 SYSTEM INFORMATION
a.
Storm Sewer Service Area
(square miles
7
b.
River Basin(s)
White Oak
c.
Number of Primary Receiving
Streams
7
d.
Estimated percentage of jurisdictional area containing the following four land use activities:
•
Residential
13.3%
•
Commercial
7.7%
•
Industrial
0.8%
•
Open Space
78.2%
Total =
1Are
100%
e.
there significant water
quality issues listed in the
attached application report?
❑ Yes ® No
Page 1
SWU-264-103102

NPDES RPE Stormwater Permit Application
III. EXISTING LOCAL WATER QUALITY PROGRAMS '
a. Local Nutrient Sensitive Waters Strategy
❑ Yes ® No
b. Local Water Supply Watershed Program
❑ Yes ® No
c. Delegated Erosion and Sediment Control Program
® Yes ❑ No
d. CAMA Land Use Plan
® Yes ❑ No
IV. CO -PERMIT APPLICATION STATUS INFORMATION
(Complete this section only if co -permitting)
a. Do you intend to co -permit with
❑ Yes ❑ No
a permitted Phase I entity?
b. If so, provide the name and permit,number of that entity:
• : Name of Phase I MS4
• NPDES Permit Number
c. Do you intend to co -permit
❑ Yes ❑ No
with another Phase II enti ?
d. If so, provide the name(s) of
the entity:
e. Have legal agreements been
finalized between the co-
❑ Yes ❑ No
ermittees?
V. RELIANCE ON ANOTHER ENTITY TO SATISFY ONE OR MORE OF YOUR PERMIT OBLIGATIONS
(If more than one, attach additional sheets)
a.. Do you intend that another
entity perform one or more of
our permit obligations?
® Yes ❑ No
b. If yes, identify each entity and the element they will be implementing
• Name of Entity
NCDENR - Division of Water Quality
• . Element they will implement
Administer Construction Site Stormwater Runoff Control
• Contact Person
Water Quality Supervisor
• Contact Address
943 Washington Square Mall, Washington, NC 27889
• Contact Telephone Number
252-946-6481.
c. Are legal agreements in place
to establish responsibilities?
® Yes ❑ No Between Land Quality and Water Quality for
issuance of the general permit along with Erosion Control Plan
a. Do you intend that another
entity perform one or more of
our permit obligations?
❑ Yes ® No
b. If yes, identify each entity and the element they will be implementing
• Name of Entity
• Element they will implement
• Contact Person
• Contact Address
• Contact Telephone Number
c. Are legal agreements in place
to establish responsibilities?
❑ Yes ❑ The town has an existing Interlocal Agreement with
Pitt County to administer this program
Page 2
SWU-264-103102

NPDES RPE Stormwater Permit Application
VI. DELEGATION OF AUTHORITY (OPTIONAL)
The signing official may delegate permit implementation authority to an appropriate staff member. This
delegation must name a specific person and position and include documentation of the delegation action
through board action.
a. Name of person to which permit authority N/A
has been delegated
b. Title/position of person above
c. Documentation of board action delegating permit authority to this person/position must be
provided in the attached application report.
VII. SIGNING OFFICIAL'S STATEMENT
Please see the application instructions to determine who has signatory authority for this permit
application. If authority for the NPDES stormwater permit has been appropriately delegated through
board action and documented in this permit application, the person/position listed in Section VI above
may sign the. official statement below.
I certify, under penalty of law, that this document and all were prepared under my
direction or supervision in accordance with a system designed to assure that qualified personnel
properly gather and evaluate the information submitted. Based on my inquiry of the person or
persons who manage the system, or those persons directly responsible forgathering the
information, the information submitted is, to the best of my knowledge and belief, true, accurate,
and complete. I am aware that there are significant penalties for submitting false information,
including the possibility of fines and imprisonment for knowing violations.
Signature
Name
Dick Casey
Title
Town Manager
Street Address
200 Howard Boulevard
PO Box
PO Box 1869
City
Newport
State
NC
Zip
28570-1869
Telephone
[phone]
Fax
[phone]
E-Mail
[e-mail]
VIII. MS4 CONTACT INFORMATION
Provide the following information for the person/position that will be responsible for day to day
implementation and oversight of the stormwater program.
a.
Name of Contact
Person
Marty Mensch
b.
Title
Director of Streets and Stormwater
c.
Street Address
140 Kirby Lane
d.
PO Box
PO Box 1869
Page 3
SWU-264-103102

NPDES RPE Stormwater Permit Application
e.
City
Newport
f.
State
NC
g.
Zip
28570-1869
h.
Telephone Number
[phone]
i.
Fax Number
[phone]
j.
E-Mail Address
[e-mail]
IX. PERMITS AND CONSTRUCTION APPROVALS
List permits or construction approvals received or applied for under the following programs. Include contact
name if different than the person listed in Item VIII. If further space needed, attach additional sheets.
a.
RCRA Hazardous Waste
N/A "
Management Program
N/A
b.
UIC program under SDWA
c.
NPDES Wastewater Discharge
Permit # -
Permit Number
d.
Prevention of Significant
N/A
Deterioration (PSD) Program
N/A
e.
Non Attainment Program
f.
National Emission Standards for
N/A
Hazardous Pollutants (NESHAPS)
reconstruction approval
g.
Ocean dumping permits under the
N/A
Marine Protection Research and
Sanctuaries Act
h.
Dredge or fill permits under
N/A
section 404 of CWA
Page 4
SWU-264-103102

TOWN OF NEWPORT
COMPREHENSIVE STORMWATER
MANAGEMENT PLAN

Comprehensive Stormwater Management Plan

Table of Contents .
1. Storm Sewer System Information........................................................................................
3
1.1.
Population Served............................................................................................................3
1.2.
Growth Rate.....................................................................................................................3
1.3.
Jurisdictional and MS4 Service Areas.............................................................................
3
1.4.
MS4 Conveyance System................................................................................................3
1.5.
Land Use Composition Estimates....................................................................................3
1.6.
Estimate Methodology......................................................................................................
3
1.7.
TMDL Identification.......................................................................................................3
2. Receiving Streams............................................................................................................
4
3. Existing Water Quality Programs........................................................................................
4
3.1.
Local Programs................................................................................................................4
3.2.
State Programs.................................................................................................................4
4. Permitting Information.......................................................................................................
5
4.1.
Responsible Party Contact List.......................................................:................................5
4.2.
Signing Official...............................................................................................................9
4.3.
Duly Authorized Representative......................................................................................
9
5. Co -Permitting Information..............................................................................................
10
6. Reliance on Other Government Entity..............................................................................
11
6.1.
Name of Entity...............................................................................................................11
6.2.
Measure Implemented...................................................................................................11
6.3.
Contact Information for Responsible Party...................................................................11
6.4
Legal Agreements..........................................................................................................11
7. Stormwater Management Program Plan .............................................................................
12
7.1
Public Education and Outreach on Storm Water Impact...............................................12
7.2.
Public Involvement and Participation............................................................................14
7.3.
Illicit Discharge Detection and Elimination..................................................................17
7.4.
Construction Site Stormwater Runoff Control
..............................................................20
7.5.
Post -Construction Storm Water Management
in New Development and Redevelopment
.......................................................................................................................................
21
7.6.
Pollution Prevention/Good Housekeeping for
Municipal Operations ...........................24

1. Storm Sewer System Information
1.1. Population Served: 3,346
1.2. Growth Rate: 33% annual rate based on US Census Bureau Figures (1990-
2000)
1.3. Jurisdictional and MS4 Service Areas: Jurisdictional 28sq. miles, MS4 Service
Area 7 Sq. Miles
1.4. MS4 Conveyance System
Briefly describe the composition of the existing MS4 system (pipes, ditches,
sheet flow) and state of maintenance of the system:
The Town's storm drain system includes a combination of pipes, ditches, curb
and gutter, and overland flow. Our Town street standards allow for the use of
curb and gutter and/or roadside ditches.
Maintenance of detention basins is the responsibility of the land owner and
enforced through the Nuisance Abatement ordinance. Major culverts and open
channels are policed for debris clogs after each major storm event. Pipe systems
and catch basins are cleaned by hand with a vacuum,periodically. Town streets
are also swept periodically. The Town has an active street sweeping program that
includes all Town and State maintained streets. Ditches, streams and open
channels are cleaned as necessary.
1.5. Land Use Composition Estimates:
Estimated percentage of MS4 Service area containing the following four land use
activities:
Residential
13.3%
Commercial
7.7%
Industrial
0.8%
en Space
78.2%
1.6. Estimate Methodology
Describe the methodology used to calculate land use percentages:
The land use percentages are based on a land use survey conducted through in the
field windshield surveys coupled with a review of aerial photography.
1.7. TMDL Identification
Do you discharge to a TMDL controlled water body: Yes. White Oak River
Basin (Newport River)

2. Receiving Streams
Table 1. Neuse
Receiving Stream Name,
Stream Segment
Water Quality
Classification
Sandy Branch
From source to Hannah Branch
SA, HQW
Shoe Branch
From source to Newport River
C
Cedar Swamp Creek
From source to Newport River
C
Deep Creek
From source to Newport River
C
Hull Swamp
. From source to Newport River
C
Black Creek (Mill Pond)
From source to Newport River
C
Newport River
From Little Creek Swamp to Atlantic
Ocean with exception of Morehead
Town Harbor restricted area
SA, HQW
3. Existing Water Quality Programs
3.1. Local Programs:
The town currently relies on NCDENR to administer its construction site
sediment control program, where applicable.
3.2. State Programs:
The existing water quality programs being implemented by the state within the
town's service area are related to development regulations for coastal counties
(CAMA).
The State administers the NPDES Phase I Stormwater Program on industrial
facilities and construction activities that disturb one or more acres of land, due to
the town's location within a CAMA county. It also administers the NPDES
Wastewater Discharge Permits Program and the Soil Erosion and Sedimentation
Control Program.
El

4. Permitting Information
4.1. Responsible Party Contact List:
Measurable Goals
Responsible Position/Party
Public Education and Outreach on Stormwater Impacts
1
Produce and distribute brochures and utility bill
Public Works Department
inserts at least once a year. Brochures will be
Stormwater Director
available at town hall. Will include information on
140 Kirby Lane
steps to reduce pollution sources, proper disposal of
Newport, NC 28570
used oils and toxic materials, and awareness of illicit
Phone: [phone]
discharges. The Town will record the number of
Fax: [phone]
materials produced and distributed.
2
Produce and distribute stormwater information
Public Works Department
booklet beginning the third year and continuing on,
Stormwater Director
that discusses the responsibility of businesses,
140 Kirby Lane
industries, and organizations and how they play a role
Newport, NC 28570
in preventing future pollution. This effort will focus
Phone: [phone]
on non-residential properties. The Town will track
Fax: [phone]
the number of booklets produced and distributed.
The town may utilize an existing handout drafted by
NCDW .
3
Develop and maintain a stormwater information page
Public Works Department
for the town's existing internet website in the third
Stormwater Director
year of the program. Post information on water
140 Kirby Lane
quality, stormwater pollutants, and ways to minimize
Newport, NC 28570
them. The site will provide contacts for reporting and
Phone: [phone]
a frequently asked questions section. The Town will
Fax: [phone]
record the number of hits to the website.
4
Develop and conduct, on an annual basis, an
Public Works Department
educational campaign to inform citizen's. businesses,
Stormwater Director
and organizations on stormwater pollutants, water
140 Kirby Lane
quality, and public reporting of illicit discharges as
Newport, NC 28570
well as public involvement programs. The Town will
Phone: [phone]
track the number of individuals that attend these
Fax: [phone]
events. The town will work in concert with NC
DWQ to prepare these presentations.
Public Involvement and Participation
5
The town will establish a Storm Drain Stenciling
Public Works Department
program with event days scheduled quarterly
Stormwater Director
throughout the year. This will help raise awareness
140 Kirby Lane
about the connection of storm drains to receiving
Newport, NC 28570
waters. The Town will record the number of
Phone: [phone]
stenciling volunteers and the number of drains
Fax: [phone]
stenciled.

6
An ongoing citizen advisory committee will be
Public Works Department
established, which meets once quarterly (meeting
Stormwater Director
may be more frequent as requited). Appointed by the '
140 Kirby Lane
Town Council to address environmental concerns
Newport, NC 28570
within the Town of Newport. This committee will
Phone: [phone]
provide input on program development pertaining to
Fax: [phone]
regulations, future projects and capital improvements.
The Town will maintain a record of meetings held
and the number of attendees.
7
Establish and maintain a community hotline through
Public Works Department
town hall to provide a means for concemed citizens
Stormwater Director
and agencies to contact the appropriate authorities
140 Kirby lane
when they see water quality problems. The Town
Newport, NC 28570
will record the number of calls received and the
Phone: [phone]
number of problems/incidents remedied as a result of
Fax: [phone]
the hotline calls.
-
8
Public information meetings will be held involving
Public Works Department
citizens, neighborhood groups, professional
Stormwater Director
organizations, industrial and commercial operations
140 Kirby Lane
and others that have an interest in this issue. Public
Newport, NC 28570
information meetings will be organized, on a to assist
Phone: [phone]
with specific issues. The town will hold these on an
Fax: [phone]
annual basis and will maintain a record of meetings
held and the number of attendees and interest groups
present. These meetings may be tied in with the
meetings established under Public Education and
Outreach Item (4).
Illicit Discharge Detection and Elimination
9
Use brochures, flyers, and other educational tools to
Public Works Department
educate the public on illegal dumping and inventory
Stormwater Director
prime areas of illegal dumping. This information
140 Kirby Lane
may be incorporated into the mailing outlined under
Newport, NC 28570
Public Education and Outreach Item (1). The Town
Phone: [phone]
will track the number of educational tools distributed,
Fax: [phone]
establish a monitoring system for prime areas for
illegal dumping, and document the number of
penalties enforced upon the participants of illegal
dumping.
10
Develop a storm drain system map beginning in year
Public Works Department
one of this program. The Town will track the
Stormwater Director
progress of the storm drain system map.
140 Kirby Lane
Newport, NC 28570 .
Phone: [phone]
Fax: [phone]
11
Develop and establish an ordinance within the first
Public Works Department
year to detect and eliminate illicit discharges. The
Stormwater Director
Town will record the development of this ordinance
140 Kirby Lane
and the number of enforcement actions that occur as
Newport, NC 28570
a result of the ordinance.
Phone: [phone]
Fax: [phone]

12
Dry weather survey of 25% of the storm drain system
Public Works Department
per year will be conducted,during year two through
Stormwater Director
five of the program, to identify non -storm water
140 Kirby Lane
flows. Areas with'suspicious'discharges will be
Newport, NC 28570
investigated. The Town will keep a record of the
Phone: [phone]
number of field tests conducted, the number of illicit
Fax: [phone]
connections found, and the number of illicit
connections r orted.
13
Establish and maintain a community hotline through
Public Works Department
town hall to provide a means for concerned citizens
Stormwater Director
'
and agencies to contact the appropriate authorities
140 Kirby Lane ,.
when they see water quality problems. The Town
Newport, NC 28570
will record the number of calls received and the
Phone: [phone]
number of problems/incidents remedied as a result of
Fax: [phone]
the hotline calls.
Post -Construction Storm Water Management in New Development and
Redevelopment
14
Develop and implement a stormwater management
Public Works Department
ordinance by (Insert Date). The Town will adopt an
Stormwater Director
ordinance that will incorporate state standards for
140 Kirby Lane
structural BMPs and will refer to the States BMP
Newport, NC 28570
manual. They will also develop a program for
Phone: [phone]
maintenance and inspection of structural runoff
Fax: [phone]
controls in years two through five. The town will
record the development of the ordinance and the
number of enforcement actions that occur as a result
of the new ordinance. A draft of this ordinance has
been completed, and is currently under review.
15
Develop a workshop and educational material in year
Public Works Department
one (with the assistance of NC DWQ) for developers
Stormwater Director
and the public on new development/redevelopment
140 Kirby Lane
stormwater responsibilities. The Town will record
Newport, NC 28570
the number of groups spoken to and the number of
Phone: [phone]
materials distributed.
Fax: [phone]
Pollution Prevention/Good Housekeeping for Municipal Operations
16
Evaluate existing programs and develop pollution
Public Works Department
prevention workshop for grounds maintenance and
Stormwater Director
landscaping employees trained to obtain reduction in
140 Kirby Lane
fertilizer, pesticide, and water usage in year two. Will
Newport, NC 28570
maintain records of the number of employees trained'.
Phone: [phone]
Fax: [phone]
17
Develop spill prevention and control procedures in
Public Works Department
year two. Will keep record of the number of persons
Stormwater Director
trained in spill response and the number of
140 Kirby Lane
educational material distributed to municipal
Newport, NC 28570
employees.
Phone: [phone]
Fax: [phone]
7

18
Assess existing fleet maintenance procedures and
Public Works Department
develop a pollution prevention workshop for
StormwaterDrector -
employees working with fleet maintenance.
140 Kirby Lane
Distribute educational materials. Will record the
Newport, NC 28570
number of employees that attend the workshop and
Phone: [phone]
the number of educational materials distributed.
Fax: [phone]
Employees may be sent off site for this training.. '
19
Continue the existing program in which all town
Public Works Department
maintained streets are swept periodically. Will record
' Stormwater Director
the n umber of street miles swept on an annual basis.
140 Kirby Lane
Newport, NC 28570
Phone: [phone]
Fax: [phone]

4.2. Signing Official
Name: Dick Casey
Title: Town Manager
Street Address: 200 Howard Boulevard
PO Box: 1869
Town: Newport
State: NC
Zip: 28570-1869
Telephone:[phone]
Fax:[phone]
Email: [e-mail]
Signature:
4.3. Duly Authorized Representative (N/A)
0

5. Co -Permitting Information
NOT APPLICABLE
10

6. Reliance on Other Government Entity
6.1. Name of Entity: NCDENR-DWQ
6.2. Measure Implemented: Part of Construction Site Stormwater Runoff Control;
NPDES General Stormwater Permit for Construction Activities
6.3. Contact Information for Responsible Party
Contact Person: Water Quality Supervisor
Contact Address: 943 Washington Square Mall
Washington, NC 27889
Contact Telephone Number: 252-946-6481
6.4. Legal Agreements
Are legal agreements in place to establish responsibilities: Yes, between Land
Quality and Water Quality for issuance of the general stormwater permit along
with the approved erosion control plan.
11

7. Stormwater Management Program Plan
7.1 Public Education and Outreach on Storm Water Impact
7.1.1. BMP's and Measurable Goals for Public Education and Outreach
BMP
Measurable Goals
Responsible Position/Party
YR.
YR.
YR.
YR.
YR.
1
2
3
4
5
1
Distribute pollution
Produce and distribute brochures and utility bill
Public Works Department
prevention brochures
inserts at least once a year. Brochures will be
Stormwater Director
available at town hall. Will include information on
140 Kirby Lane
steps to reduce pollution sources, proper disposal of
X
X
X
X
X
Newport, NC 28570
used oils and toxic materials, and awareness of illicit
Phone: [phone]
discharges. The Town will record the number of
Fax: [phone]
materials produced and distributed.
2
Distribute information
Produce and distribute stormwater information
Public Works Department
booklet
booklet beginning the third year and continuing on,
Stormwater Director
that discusses the responsibility of businesses,
140 Kirby Lane
industries, and organizations and how they play a role
X
X
X
Newport, NC 28570
in preventing future pollution. This effort will focus
Phone: [phone].
on non-residential properties. The Town will track
Fax: [phone]
the number of booklets produced and distributed.
3
informational Website
Develop and maintain a stormwater information page
Public'Works Department
for the town's existing internet website in the third
Stormwater Director
year of the program. Post information on water
140 Kirby Lane
quality, stormwater pollutants, and ways to minimize
X
X
X
Newport, NC 28570
them. The site will provide contacts for reporting and
Phone: [phone]
a frequently asked questions section. The Town will
Fax: [phone]
record the number of hits to the website.
4
Public Outreach
Develop and conduct, on an annual basis, an
Public Works Department
educational campaign to inform citizen's. businesses,
Stormwater Director
and organizations on stormwater pollutants, water
140 Kirby Lane
quality, and public reporting of illicit discharges as
X
X
X
X
X
Newport, NC 28570
well as public involvement programs. The Town will
Phone: [phone]
track the number of individuals that attend these
Fax: [phone]
events.
12

7.1.2. Target Audience:
The Town's target audience will include all citizens and business owners with the
town's jurisdiction. The Town will actively target neighborhood, groups,
industrial and commercial associations, environmental groups, builders
associations and others that have an interest in this issue.
7.1.3. Target Pollutant Sources: What pollutant source are you trying to address and
why? List the targeted pollutants and give a brief explanation as to why these are
selected:
Pollutant sources that -the Town will target include nutrient and fecal coliform by
ensuring the proper use and disposal of landscape and garden chemicals, and
disposing of used motor oil and household hazardous wastes.
The Town will address pollutants such as sediment and trash by ensuring the
proper disposal of debris and the proper use of sediment and erosion control
through cooperation with NCDENR.
7.1.4. Outreach Program: Write a narrative description of the approach you are going to
take in your outreach program.`
The town's Outreach Program will be broad based. The overall objective is to
create an understanding of the Town of Newport's Stormwater Management Plan
as- a service to its citizens and to educate the public on maintaining and
improving water quality for the future. The Town will begin by performing
several different distributions of information to the citizens that include bill
inserts and brochures that address stormwater and relatedissues.
The long-term goals of the public education program will be to address issues
such as pollution prevention, volunteer programs, and environmental issues. The
Town will create and maintain a website on the Town's web page to provide
information on water quality, storm water pollutants, and ways to minimize them.
It will also provide contacts for reporting problems and answering frequently
asked questions. The town will offer informational sessions to citizen's, local
businesses, and organizations in an effort to provide more options and
opportunities to get the word out to the public about the adverse effects of
stormwater runoff.
7.1.5. Decision Process: Describe the decision process used to create this program
element.
The program was developed based on recommendations provided through the
Environmental Protection Agency's website regarding stormwater, as well as
resources' and programs currently available for use by the town.
7.1.6. Evaluation: Explain how you will evaluate the success of this minimum
measure, including,the measurable goals for each of the BMPs.
The Town will evaluate its Stormwater Management Program annually to ensure
all measurable goals are being met and to plan' strategies to address any
differences identified. The review will include at least the following positions
within the Town: Stormwater Director, Town Manager, Public Works
Superintendent, Code Enforcement Officer.
13

7.2. Public Involvement and Participation
7.2.1. BMPs and -Measurable Goals for Public Involvement and Participation
BMP
Measurable Goals
Responsible Position/Party, ,
YR.
YR.
YR.
YR.
YR
1
2
3
4
5
1
Storm Drain Stenciling
Establish a Storm Drain Stenciling program with
Public Works Department (PWD)
event days scheduled quarterly throughout the year.
140 Kirby Lane
This will help raise awareness about the connection
X
X
X
X
X
Newport, NC 27834
of storm drains to receiving waters. The Town will
Phone: [phone]
record the number of stenciling volunteers and the
Fax: [phone]
number of drains stenciled.
2
Environmental Advisory
An ongoing citizen advisory committee will be
Public Works Department (PWD)
Committee
established, which meets' once quarterly. Appointed
Stormwater Director
by Town Council to address environmental concerns
140 Kirby Lane
within the Town of Newport. This committee will
X
X
X
X
X
Newport, NC 27834
provide input on program development pertaining to
Phone: [phone]
regulations, future projects and capital
Fax:[phone]
improvements. The Town will maintain a record of
meetings held and the number of attendees.
3
Community Hotline
Establish and maintain a community hotline to
Public Works Department (PWD)
provide a means for concerned citizens and agencies
Stormwater Director
to contact the appropriate authorities when they see
140 Kirby Lane
water quality problems. The Town will record the
X
X
X
X
Newport, NC 27834
number of calls received and the number of
Phone:[phone]
problems/incidents remedied as a result of the hotline
Fax: [phone]
calls.
4
Citizen Input
Public information meetings will be held involving
Public Works Department
citizens, neighborhood groups, professional.
StormwaterDrector
organizations, industrial and commercial operations
140 Kirby Lane
and others that have an interest in this issue. Public
Newport, NC 27834
information meetings will be organized on a to assist
X
X
X'
X
X
Phone: [phone]
with specific issues. The town periodic basis will
Fax: [phone] ,
maintain a record of meetings held and the number
of attendees and interest groups present. Meeting
will be held once annually with representation from
NC DWQ.
14

7,2.2 Target Audience:
The Town's target audience will include all citizens. The program will be set up
to allow and involve neighborhood groups, professional organizations, industrial
and commercial operations, environmental groups, builders, realtors and other
entities that may have an interest in the Stormwater Management Program.
7.2.3. Participation Program:
The Town's plan is to actively involve the public in the development and
implementation of the program with the use of the Stormwater Advisory
Committee which will be a public appointed committee. Public involvement will
be further developed through the Planning Board as well as Town Council which
will require public hearings in order to pass new regulations associated -with
implementation of the stormwater program.
7.2.3.1. Citizen Representation
Citizen representation will be accomplished through the
Stormwater Advisory Committee, which will be citizen
represented groups.
7.2.3.2. Public Meetings
It will be the Town's policy to include public input in the
development of this program. This policy will be organized to
ensure that the public is adequately informed and given
opportunities to comment concerning the Town's Stormwater
Management Program. Public involvement will be addressed
through public hearings required as part of any new regulations
or ordinances created as a part of the Stormwater Management
Program. Public hearings will occur at Town Council meetings.
7.2.3.3. Working with citizen volunteers
The Town will also involve citizens through the establishment of
a Storm Drain Stenciling Program., This program will solicit
citizens of all ages, race, and economic background to assisting
to promote the protection of our surface waters while providing
public education for others.
7.2.4. Decision Process: Document your decision process for the development of a
storm water public involvement/participation program and the individual BMPs,
measurable goals, and responsible persons for your program.
The program was developed based on recommendations provided through the
Environmental Protection Agency's website regarding stormwater, as well as
resources and programs currently available for use by the town.
15

7.2.5. Evaluation: Explain how you will evaluate the success of this minimum measures,
including the measurable goals for each of the BMPs.
The Town will evaluate its Stormwater Management Program annually to ensure all
measurable goals are being met and to plan strategies to address any differences
identified. The review will include at least the following positions within the Town:
Stormwater Director, Town Manager, Public Works Superintendent, Code
Enforcement Officer.
16

7.3. Illicit Discharge Detection and Elimination
7.3.1. BMPs and Measurable Goals for Illicit Discharge Detection and Elimination
BMP
Measurable Goals
Responsible Position/Party
YR.
YR.
YR.
YR.
YR.
1
2
3
4
5
1
Illegal Dumping
Use brochures, flyers, and other educational tools
Public Works Department
to educate the public on illegal dumping and
Stormwater Director
inventory prime areas of illegal dumping. The
140 Kirby Lane
Town will track the number of educational tools
X
X
X
Newport, NC 27834
distributed, whether or not an inventory is
Phone:[phone]
completed of prime areas for illegal dumping, and
Fax: [phone]
the number of penalties enforced upon the
participants of illegal dumping.
2
Storm Drain System Map
Develop a storm drain system map beginning in
Public Works Department
year one of this program. The Town will track the
Stormwater Director
progress of the storm drain system map.
X
X
X
140 Kirby Lane
Newport, NC 27834
Phone:[phone]
Fax:[phone]
3
Ordinance for illicit
Develop and establish an ordinance within the first
Public Works Department
discharge detection and
year to detect and eliminate illicit discharges. The
Stormwater Director
elimination
Town will record the development of this
140 Kirby Lane
ordinance and the number of enforcement actions
X
X
X
X
X
Newport, NC 27834
that occur as a result of the ordinance. The town
Phone: [phone]
may incorporate this into their draft stormwater
Fax:[phone]
management ordinance.
4
Identify illicit connections
Dry weather survey of 25% of the storm drain
Public Works Department
through dry weather
system per year will be conducted during year two
Stormwater Director
screening
through five of the program, to identify non -storm
140 Kirby Lane
water flows. Areas with suspicious discharges will
X
X
X
X
Newport, NC 27834 .
be investigated. The Town will keep a record of
Phone:[phone]
the number of field tests conducted, the number of
Fax: [phone]
illicit connections found, and the number of illicit
connections reported.
5
Illicit discharge/illegal
Establish and maintain a community hotline to
Public Works Department
dumping hotline
provide a means for concerned citizens and
Stormwater Director
agencies to contact the appropriate authorities
140 Kirby Lane
when they see water quality problems. The Town
X
X
X
X
Newport, NC 27834
will record the number of calls received and the
Phone: [phone]
number of problems/incidents remedied as a result
Fax: [phone]
of the hotline calls.
17

7.3.1 Storm Sewer System map: Describe how you will develop a storm sewer system
map showing the location of all outfalls and the names and locations of all
receiving waters (What sources of information will you use? What form will
the map take (digital, paper map)? What method will you use to verify the
accuracy of the locations? Will you do field verification and if so, will you use
any specific technology? How will you update the map, once data collection
begins? Who will keep the map current?
The map will be developed by using field surveys and existing information
developed through aerial mapping program as well as information provided by
NC Center for Geographic Information and Analysis (NCCGIA). The system
map will be digital. The accuracy of the location will be identified by GPS. The
map will be updated on an ongoing basis as new development or construction
occurs. The system map will be the responsibility of the Public Works
Department.
7.3.3. Regulatory Mechanism:
Do you have an ordinance iri place that prohibits non-stormwater from your
drainage system? Not at this time
Describe your process for developing a regulatory mechanism and when you plan
on doing so.
The process for developing the Town's regulatory mechanism will follow the
normal process of ordinance development. The first step being to gather
information on current regulations existing in other municipalities. Town staff
will review those programs for suitability to the Town of Newport. Meetings
will be held with interested parties for input on the development of the regulation
along with draft reviews by pertinent commissions. Either town staff or a
consultant will also be brought in to assist with preparation of the ordinance.
Once a final draft has been developed the proposed regulation will be brought
before the Planning Board with the appropriate public advertisement. Once the
regulation has been approved by the Planning Board, it will then be taken in front
of Town Council. This hearing will be properly advertised to allow for citizen
involvement in the public hearing portion of the regulatory development. Once
adopted by the Town Council the regulation will be enacted and enforced. The
Town plans on beginning this process in the first year of the stormwater
management program.
7.3.4. Enforcement: Describe the methodology you will use to take enforcement actions
needed when you find an illicit connection. Include process you will follow if
different from the method of adopting or amending your current ordinance.
The methodology used to take enforcement action will be defined in the
ordinance as adopted by council and will be based on state statutes and model
ordinances.
7.3.5. Detection and Elimination: Describe your plan to detect and address illicit
discharges to your system including discharges from illegal dumping and spills.

The Town will begin by identifying the location of dry weather discharges to the
system through training of maintenance crews, building inspectors and other staff
likely to be in areas where discharges are likely to occur. Town personnel will
utilize several methods including: visual observation, and pipeline schematics to
track identified flows. The Town will use field screening of dry weather flows at
outfalls to aid in identifying illicit discharges.
The program will also involve developing methods to eliminate improper
connections and exploring alternative disposal options for discharges that cannot
be sent to the storm sewer system, such as using sanitary sewer system or
collecting and disposing of discharges off site at an approved disposal facility.
The program will also document the elimination of illicit connections, including
recording the location of the connection and the method used to remove the
connection. By documenting our procedures we will be able to evaluate the
effectiveness of our efforts.
7.3.6. Non Stormwater Discharges: Address the following categories of non -storm
water discharges or flows only if you identify them as significant contributors of
pollutants to your small MS4:
Water line flushing
Allowable
Landscape irrigation
Allowable
Diverted stream flows
Allowable
Rising ground waters
Allowable
Uncontaminated ground water infiltration
Allowable
Uncontaminated pumped ground water
Allowable
Discharges from potable water sources
Allowable .
Foundation drains
Allowable
Air conditioning condensation
Allowable
Irrigation water
Allowable
Springs
Allowable
Water from crawl space pumps
Allowable
Footing drains
Allowable
Lawn watering
Allowable
Individual residential car Washing
Allowable
Flows from riparian habitats and wetlands
Allowable
De -chlorinated swimming pool discharges
Allowable
Street wash water
Allowable
7.3.7. You may also develop a list of other similar occasional incidental non-
stormwater discharges that will not be addressed as illicit discharges. You must
document in your SWMP any local controls .or conditions placed on the
discharges and you must include a provision prohibiting any individual non-
stormwater discharge that is determined to be contributing significant amounts of
pollutants to your MS4.
Charity Car Washes will be allowed. The Town will evaluate the need to
regulate this activity in year one. If needed, the Town will consider regulating by
limiting the frequency at which they occur and requiring management of
stormwater runoff.
19

7.3.8. Outreach: describe how you plan to inform public employees, businesses, and the
general public of hazards associated with illegal discharges and improper
disposal of waste:
Part of the outreach program will be to distribute brochures, flyers, and bill
inserts to educate homeowners and businesses about the proper operation and
maintenance of their.septic systems to reduce the likelihood of failure.
The plan also'calls for establishing and maintaining a hotline for citizens and
businesses to report illegal dumping and suspicious discharges. The hotline will
be advertised in the Town page, utility bill inserts, and webpage.
7.3.9. Decision Process: Document your decision process for the development of a
storm water illicit discharge detection and elimination program and the individual
BMPs, measurable goals, and responsible persons for your program.
The program was developed based on recommendations provided through the
Environmental Protection Agency's website regarding stormwater, as well as
resources and programs currently available for use by the town. Also considered
were existing problems that needed to be addressed such as illegal dumping. The
responsible persons selected for these BMPs and measurable goals, are the ones
currently responsible for these or similar programs currently in existence.
7.3.10. Evaluation: Explain how you will evaluate the success of this minimum measure,
including the measurable goals for each of the BMPs.
The Town will evaluate its Stormwater Management Program annually to ensure
all measurable goals are being met and to plan strategies to address any
differences identified. The review will include at least the following positions
within the Town: Stormwater Director, Town Clerk, and Town Manager.
7.4. Construction Site Stormwater Runoff Control
The Town of Newport will rely on, its locally delegated Erosion and Sediment Control Program
administered by the DWQ NPDES for administration of Construction Activities to meet the
requirement of 7.4. as listed on this permit application.
F

7.5. Post -Construction Storm Water Management in New Development and Redevelopment
7.5.1. BMPs and Measurable Goals for Post -Construction Storm Water Management in New Development and Redevelopment
BMP
Measurable Goals
YR.
1
YR.
2
YR.
3
YR.
4
YR.
5
Responsible Position/Party
1
Ordinance for Post construction
Develop and implement a stormwater
Public Works Department
runoff
ordinance by (Insert Date). The Town. will
Stormwater Director
adopt an ordinance that is based on rules
140 Kirby Lane
outlined. under the Universal Stormwater
Newport, NC 27834
Management Program (USMP) and will refer
Phone: [phone]
to the States BMP manual. The will also
X
X
X
X
Fax:[phone]
develop a program for maintenance and
inspection of structural runoff controls in
years two through five. The town will record
the development of the ordinance and the
number of enforcement actions that occur as a
result of the new ordinance.
2
Education program for
Develop a workshop and educational material
Public We Department
developers and the public
in year one for developers and the public on
Stonawater Director
- -
new development/redevelopment stormwater
X
X
X
X
X
140 Kirby Lane
responsibilities. The Town will record the
Newport, NC 27834
number of groups spoken to and the number
Phone: [phone]
of materials distributed.
Fax: [phone]
21

7.5.2. Non Structural BMPs: Describe any non-structural BMPs in your program.
Town staff will develop and propose policy and planning documents to address post -
construction storm water management in new development and redevelopment.
Education programs for developers and the public will be utilized to educate about
project designs that minimize water quality impacts. Another measure used will be
source control measures often thought of as good housekeeping, preventative
maintenance, and spill prevention.
7.5.3. Structural BMPs: Describe any structural BMPs in your program.
The Town will use the Division of Water Quality's Stormwater Best Management
Practices manual as a model document. In order to ensure that facilities are meeting
the requirements, an annual report and inspection are required. Properties will be
required to submit an annual maintenance report for stormwater management
facilities in accordance with the operation and maintenance agreement submitted in
the initial site plan submittal.
The annual report, will describe the maintenance and repair activities of the subject
year, including copies of inspection and repair logs, and note any needed
modifications to the repair plan for the following year.
All BMPs, which qualify for stormwater must be maintained by the property owner
and verified upon inspection. The Town will perform periodic inspections to ensure
that facilities are maintained in compliance with, Town standards.
7.5.4. Regulatory Mechanism: describe the mechanisms you will use to address post
construction runoff from new developments and redevelopments and why did you
choose that mechanism. If you need to develop a mechanism, describe your plan and
a schedule to do so.
The Town will use policies and ordinances to control applicable projects that will be
permitted locally for stormwater management controls for either a low -density
project or a high -density project to the extent allowable under State or local law. The
policies. and ordinances chosen will allow involvement from the public in the
development of the town's program at the same time allowing the municipality to set
forth standards as defined by the State to develop, implement, and enforce this
program.
The town will amend existing development regulations to address these standards.
Once the approval is obtained from the state, then the ordinance will follow normal
procedures for adoption by the town. This procedure includes review by Planning
Board along with a Public hearing and then review and adoption by Town Council
along with a Public Hearing. The Town will then implement their program by (Insert
Date).
22

7.5.5. Operation and Maintenance: describe how you will ensure the long term operation and
maintenance of your selected BMPs. Options to help ensure that future O&M
responsibilities are clearly identified include an agreement between you and another
party such as the post development land owners or regional authorities.
The long-term operation and maintenance of the structural BMPs required by the
Town's program will include an agreement between the Town and the party
responsible for maintenance of the structure and a program that will include
requirement that the owner of a permitted structure shall submit annually a
maintenance inspection report on each structural BMP.
7.5.6. Decision Process: Documentyour decision process for the development of a post -
construction stormwater management program.
The program was developed based on recommendations provided through the
Environmental Protection Agency's website regarding stormwater, as well as
resources and programs currently available for use by the town.
7.5.7. Evaluation: Explain how you will evaluate the success of this minimum measure,
including the measurable goals for each of the BMPs.
The Town will evaluate its Stormwater Management Program annually to ensure all
measurable goals are being met and to plan strategies to address any differences
identified. The review will include at least the following positions within the Town:
Stormwater, Director, Town Clerk, and Town Manager.
23

7.6. Pollution Prevention/Good Housekeeping for Municipal Operations
7.6.1. BMP and Measurable Goals for Pollution Prevention/Good Housekeeping for Municipal Operations
BMP
Measurable Goals
Responsible Position/Party
YR.
YR.
YR.
YR.
YR
1
2
3
4
5
1
Training program for grounds
Evaluate existing programs and develop
Public Works Department
maintenance and landscaping
pollution prevention workshop for grounds
Stormwater Director
maintenance and landscaping employees
140 Kirby Lane
trained to obtain reduction in fertilizer,
X
X
X
X
Newport; NC 27834 -
pesticide, and water usage in year two. Will
Phone: [phone]
maintain records of the number of employees
Fax: [phone]
trained.
2
Develop a spill prevention and
Develop spill prevention and control
Public Works Department
control plan for municipal
procedures in year two. Will keep record of
Stormwater Director
facilities
the number of persons trained in spill
X
X
X
X
140Kirby Lane
response and the number of educational
Newport, NC 27834
material distributed to municipal employees.
Phone: [phone]
Fax:[phone]
3
Training program for fleet
Assess existing fleet maintenance procedures
Public Works Department
maintenance
and develop a pollution prevention workshop
Stormwater Director
for employees working with fleet
140 Kirby Lane
maintenance. Distribute educational materials.
X
X
X
X
X
Newport; NC 27834
Will record the number of employees that
Phone:[phone]
attend the workshop and the number of
Fax:[phone]
educational materials distributed. Employees
maybe sent off site for this training.
4
Street cleaning
Continue the existing program in which all
Public Works Department
town maintained streets are swept
StormwaterDrector
periodically. Will record the n umber of street
X
X
X
X
X
140 Kirby Lane
miles swept on an annual basis.
Newport, NC 27834
Phone: [phone]
Fax: [phone]
24

7.6.2. Affected Operations: Specifically list your municipal operations that are impacted by this operation and
maintenance program. You must also include a list of industrial facilities you own or operate that are
subject to NPDES General. Stormwater Permits or individual NPDES permits for discharges of
stormwater associated with industrial activity that ultimately discharge to the MS4. Include the permit
number and certificate of coverage number for the facility.
The municipal operations that will be impacted by this operation and maintenance program would be
the following: the Street Maintenance Division, Buildings and Grounds Division, Sanitation Division,
Fleet Maintenance Division, and Recreation and Parks Department Operation and Maintenance.
List of Industrial Facilities Requiring Individual NPDES Permit's
Newport Utilities Wastewater Treatment Plant - NPDES Wastewater Discharge Permit.
7.6.3. Training: Describe any government employee training program you will use to prevent and reduce
stormwater pollution from activities such as park and open space maintenance, fleet and building
maintenance, new construction and land disturbances, and storm water system maintenance. Describe
any existing available materials you plan to use. Describe how this program will be coordinated with
the outreach programs developed for the public information minimum measure and the illicit
discharge minimum measure....
The Town will conduct an initial training program of all employees that are actively involved in
facility operations and routine orientation training of new employees about storm water management;
potential sources of contaminants; reduction in usage of fertilizers, pesticides, and water usage; and
Best Management Practices to eliminate stormwater runoff, pollution. Operational employees will
receive formal training and information through brochures, flyers, posters, employee meetings,
bulletin boards, and with training that shows areas of potential storm water contamination and
associated pollutants. -
Through this training, the Town will solicit ideas from employees on methods to prevent storm water
pollution and reward those who participate in the program.
7.6.4. Maintenance and Inspections: Describe maintenance activities, maintenance schedules, and long term
inspection procedures for controls to reduce floatables and other pollutants to your MS4.
Annual inspections are conducted by the Fire Department to identify unsafe conditions, including the
potential for discharging of hazardous materials. The Town routinely conducts self inspections to
ensure OSHA compliance. There are regular inspections and cleaning of oil separators associated with
Fleet Maintenance located at the Public Works Complex. All paved areas within the Public Works
Complex are swept on a weekly basis. Litter patrol, on a weekly basis and as needed, collects debris
and/or litter at the Public Works Complex.
Town staff will conduct periodic stormwater system inspections. Specifically, the town will inspect
the stormwater system, stormwater controls, and check for stormwater pollution potential at the Town'
operations. These inspections will occur at least annually.
7.6.5. Vehicular Operations: Describe your controls for reducing or eliminating the discharge of pollutants
from municipal parking lots, maintenance and storage yards, waste transfer stations, fleet or
maintenance shops with outdoor storage areas, and salt/sand storage locations and snow disposal areas
you operate.
Vehicle and equipment fueling is provided at a protected designated fueling area. The fleet
maintenance area is inspected and cleaned weekly. As part of the stormwater management program
written procedures will be developed to assure that proper disposable of harmful substances are being
disposed of properly.
25

7.6.6. Waste Disposal: Describe your procedures for the proper disposal of waste removed from your MS4
and your municipal operations, including dredge spoil, accumulated sediments, floatables, and other
debris.
All waste produced and collected as a result of maintenance operations is taken to.a certified disposal
site, recycled, or spread and stabilized appropriately.
7.6.7. Flood Management Projects: Describe your procedures to ensure that new flood management projects
are assessed for impacts on water quality and existing projects are assessed for incorporation of
additional water quality protection devices or practices.
The Town will evaluate flood management projects for impacts on water quality. The review will
include at least the following positions within the Town: Stormwater Director, Town Manager,
Building Inspector, and the town's engineer. Staff will access the project to see if it meets the goals as
outlined in the program and make suggestions if required.
7.6.8. Existing Ordinances: Describe your decision process for reviewing existing ordinance for possible
modifications to address stormwater issues.
The Town will review existing ordinances for possible modifications to address stormwater issues.
The review will include at least the following positions within the Town: Stormwater Director, Town
Manager, Building Inspector, and the town's engineer.
7.6.10. Decision Process: Document your decision process for the development of a pollution prevention/good
housekeeping program for municipal operations. Your rationale statement must address both your
overall pollution prevention/good housekeeping program and the individual BMPs, measurable goals,
and responsible persons for your program.
The Town will establish procedures with Town Operations to serve as a model for business operations
within the Town of Newport.
7.6.11. Evaluation: Evaluation: Explain how you will evaluate the success of this minimum measure,
including the measurable goals for each of the BMPs.
The Town will evaluate its Stormwater Management Program annually to ensure all measurable goals
are being met and to plan strategies to address any differences identified. The review will include at
least the following positions within the Town: Stormwater Director, Town Clerk, and Town Manager.

TOWN OF NEWPORT
RESOLUTION ADOPTING
STORMWATER POLICY

Town of Newport, North Carolina
Stormwater Resolution
TOWN OF NEWPORT, NORTH CAROLINA
RESOLUTION ADOPTING STORMWATER POLICY FOR
THE TOWN OF NEWPORT
PEAS, stormwater poses a serious threat to the public health, safety and welfare of the Citizens of the
of Newport; and
the threat cannot be entirely eliminated but can be managed; and
AS, an effective method of managing stormwater is the construction of capital drainage and related
and the proper operation and maintenance of stormwater drainage infrastructure owned and
J by the Town of Newport; and
'HEREAS, an equitable and effective method of funding the aforementioned stormwater management items
through the imposition of a stormwater management program funded by user fees, as identified by the North
trolina General Assembly at NCGS 160A-314 (attached)
THEREFORE the Town Council of the Town of Newport, North Carolina hereby adopts the attached
1. Furthermore, pursuant to the policy, the Town Council fixes the following stormwater service
effective(Insert Date):
Square Feet of Impervious Surface
Monthly Stormwater Service Charge
up to 1,517
$3.00
1,518 to 2,322
$4.00
Greater than 2,322
$5.00
Square Feet of Impervious Surface
Monthly Stormwater Service Charge
201 to 600
$15.00
601 to 20,000
$25.00
20,001 to 40,000
$50.00
40,001 to 100,000
$60.00
Greater than 100,000
$125.00
the Town Council appoints the following individuals to the Newport Stoimwater Advisory
ittee: David Heath, Bob Benedict, Mickey Simmons, Charles Hudson, John Davis, Anita Staton, Manly
Duncan Daughtry.

""-
§ 160A-314. Authority to fix and enforce. rates.
(a) A city may establish and revise from time to time schedules of rents, rates, fees,
charges, and penalties for the use of or the services furnished by any public enterprise.
Schedules of rents, rates, fees, charges, and penalties may vary according to classes of service,
and different schedules may be adopted for services.provided outside the corporate limits of the
city.
(al) (1) Before it establishes or revises a schedule of rates, fees, charges, or penalties
for stormwater management programs and. structural and natural stormwater
and drainage systems under this section, the city council shall hold a public
hearing on the matter. A notice of the hearing shall be given at least once in a
newspaper having general circulation in the area, not less than seven days
before the public hearing. The hearing may be held concurrently with the
public hearing on the proposed budget ordinance.
(2) The fees established under this subsection must be made applicable throughout
the area of the city. Schedules of rates, fees, charges, and penalties for
providing stormwater management programs and structural and natural
stormwater and drainage system service may vary according to whether the
property served is residential, commercial, or industrial property, the property's
use, the size of the property, the area of impervious surfaces on the property,
the quantity and quality of the runoff from the property, the characteristics of
the watershed into which stormwater from the property drains, and other
factors that affect the stormwater drainage system. Rates, fees, and charges
imposed under this subsection may not exceed the city's cost of providing a
stormwater management program and a structural and natural stormwater and
drainage system. The city's cost of providing a stonnwater management
program and a structural and natural stormwater and drainage system includes
any costs necessary to assure that all aspects of stonnwater quality and quantity
are managed in accordance with federal and State laws, regulations, and rules.
(3) No stormwater utility fee may be levied under this subsection whenever two or
more units of local government operate separate- stormwater management
programs or separate structural and natural stonnwater and drainage system
services in the same area within a county. However, two or more units of local
government may allocate among themselves the functions, duties, powers, and
responsibilities for jointly operating a stormwater management program and
structural and natural stormwater and drainage system service in the same area
within a county, provided that only one unit may levy a fee for the service
within the joint service area. For purposes of this subsection, a unit of local
government shall include a regional authority providing stormwater
management programs and structural and natural stormwater and drainage
system services.
(a2) A fee for the use. of a disposal facility provided by the city may vary based on the
amount, characteristics, and form of recyclable materials present in solid waste brought to the
facility for disposal. This section does not prohibit a city from providing aid to low—income
persons to pay all or part of the cost of solid waste management services for those persons.
(b) A city shall have power to collect delinquent accounts by any remedy provided by
law for collecting and enforcing private debts, and may specify by ordinance the order in which
http://www.nega.statel.ne.uslEnactedLegislationIStatutes/HTMLIBySectionIChapter_160A/... 4/23/2007

GS 160A-314 Page 2 of 2
partial payments are to be applied among the various enterprise services covered by a bill for
the services. A city may also discontinue service to any customer whose account remains
delinquent for more than 10 days. When service is discontinued for delinquency, it shall be
unlawful for any person other than a duly authorized agent or employee of the city to do any act
that results in a resumption of services. If a delinquent customer is not the owner of the premises
to which the services are delivered, the payment of the delinquent account may not be required
before providing services at the request of a new . and different tenant or occupant of the
premises, but this restriction shall not apply when the premises are occupied by two or more
tenants whose services are measured by the same meter.
(c) Except as provided in subsection (d) of this section and G.S. 160A-314.1, rents,
rates, fees, charges, and penalties for enterprisory services shall be legal obligations of the
person contracting for them, and shall in no case be a lien upon the property or premises served,
provided that no contract shall be necessary in the case of structural and natural stormwater and
drainage systems.
(d) Rents, rates, fees, charges, and penalties for enterprisory services shall be legal
obligations of the owner of the premise's served when:
- (1) . The property or, premises is leased or rented to more than one tenant and
services rendered to more than one tenant are measured by the same meter.
(2) Charges made for use of a sewage system are billed separately from charges
made for the use of a water distribution system.
(e) Nothing in this section shall repeal any portion 'of any city charter inconsistent
herewith. (1971, c. 698, s. 1; 1991, c. 591, s. 1; c. 652, s. 4; 1991 (Reg. Sess., 1992), c. 1007, s.
46; 1995 (Reg. Sess., 1996), c. 594, s. 28; 2000-70, s. 4.)
This document (also available in PDF and RTF formats) is not an official document.
Please read the caveats on the main NC Statutes Page for more information.
http://www.ncga.state.ne.uslEnactedLegislationIStatutes/HTMLIBySectionIChapter—l60A/... 4/23/2007

TOWN OF NEWPORT
STORMWATER POLICY FOR PROPERTIES
WITHIN THE TOWN'S CORPORATE LIMITS

TOWN OF NEWPORT STORMWATER POLICY '
FOR PROPERTIES WITHIN THE TOWN OF NEWPORT CORPORATE LIMITS
Section 1. Findings and Purpose
The Town of Newport Town Council makes the following findings:
a. Stormwater poses a serious threat to the public health, safety, and welfare. This threat cannot be eliminated
entirely. Factors affecting this threat which are beyond the Town's control include: frequency and intensity of
precipitation events; the topography in and around the Town; the types of soils and other geologic structures found
in and around the Town; body of law established under state and federal authority concerning water rights generally
and including but not limited to navigable and non -navigable waters, surface waters, and underground waters;
unauthorized interference with the Towns stormwater drainage system; the design and maintenance of those
portions of the stormwater drainage system constructed or maintained by others, including private parties and other
governmental entities; and the amount of impervious surfaces associated with a given level of development.
b. The management of stormwater can reduce the above described threat through the following:
1. Constructing, operating and maintaining needed facilities;
2. Regulating and controlling the use and development of land to reduce the adverse effects of stormwater;
3. Equitably and adequately funding the stormwater management program by a system of charges that is
related to the volume and quality of stormwater runoff from developed land.
Section 2. Definitions
As used in this policy, unless the context clearly indicates otherwise, the following definitions shall apply:
a. Town shall mean the Town of Newport.
b. Committee shall mean the Newport Stormwater Advisory Committee as established by this Policy.
c. Customer shall mean the person or firm to which a bill for stormwater service charges is sent.
d. Developed Land shall mean property altered from a natural state by construction or installation of more than 200
square feet of impervious surfaces.
e. Impervious Surfaces shall mean those areas within developed land which prevent or significantly impede the
infiltration of stormwater into the soil. Common impervious surfaces include, but are not limited to, roof tops,
sidewalks, walkways, patio areas, driveways, parking lots, storage areas, brick or concrete pavers, and other surfaces
which prevent or significantly impede the natural infiltration of stormwater into the soil.
f. Non -Residential shall mean any developed land of over 200 impervious square feet and not fitting the definition of
Residential defined by this Policy.
g. Residential shall mean developed land containing one or more structures which are designed to provide living
quarters for one or more persons and shall include houses, manufactured homes, mobile homes located on individual
lots or parcels of land, mobile homes in mobile home parks, boarding houses, apartments, condominiums, attached
houses, townhouses, and any other structure with apermanent residence.

h. Service Rate Charee shall mean the portion of stormwater service charges applicable to a parcel of developed land
which is generally reflective of a parcel's impact on the cost of providing services and facilities to properly control
stormwater runoff quantity and quality. The service rate charge will vary from one customer to another based upon
the amount of impervious surfaces, within certain classifications as defined by this policy.
i. Stormwater Director shall mean the Director of the Town of Newport's Street & Stormwater Maintenance or his
designee.
j. Undeveloped Land shall mean land that does not meet the definition of developed land.
Section 3. Systems Operation
a. Stormwater service charges will be determined and modified from time to time so that the total revenues
generated by said charges will be used to pay those Stormwater expenses as are reasonably necessary for payment of
up to 100 percent of the operations and maintenance costs of Town owned and maintained stormwater drainage
system components and principal and/or interest on, debt related to the capital construction of stormwater system
components owned by and operated by the Town of Newport as determined by the Town Stormwater Director. The
modification of such Stormwater service charges will be in accordance with state and local laws.
Section 4. Stormwater Service Charges
a. Stormwater service charges shall accrue beginning on (Insert Date), and shall be billed periodically thereafter to
customers for all developed land in the Town. The Stormwater service charges and the basis of the stormwater
service charges shall be established by resolution of the Town Council (attached) prior to (Insert Date), in
accordance with state and local laws and shall not exceed the system operation needs specified in Section 3 of this
Policy.
Section 5. Exemptions and Credits Applicable to Service Charges
Except as provided in this section, no public or private property shall be exempt from stormwater service charges or
receive a credit or offset against such service charges. No exemption or reduction in stormwater service charges
shall be granted based on the age, tax or economic status, race or religion of the customer, or other condition
unrelated to the cost of providing stormwater services and facilities.
a. The following exemptions shall be allowed:
1. Undeveloped land shall be exempt from stormwater service charges.
2. Public road rights -of -way which have been conveyed to and accepted for maintenance by the State of
North Carolina, public streets and rights -of -way conveyed to and accepted for maintenance by the Town of
Newport, and those roads available for use in common by the general public for motor vehicle -
transportation shall be exempt from the stormwater service charge. This exemption shall.not apply to any
other uses of developed land for public purposes such as, but not limited to, offices, airports, maintenance
yards, water and wastewater treatment plants, water reservoirs, parking lots or garages, parks, recreation
facilities, libraries, schools, colleges, social service centers, public housing, hospitals, convalescent centers,
and other developed land used for public purposes. This exemption shall not apply to internal site roadways
within such public facilities. This exemption shall not apply to private roads or drives, or to internal roads,
drives, and parking areas in privately -owned properties.
3. Railroad tracks shall be exempt from stormwater service charges. However, railroad stations,
maintenance buildings, or other developed land used for railroad purposes shall not be exempt from
stormwater service charges.

4. Any property exempt by state or federal law from such charges
5. Any property with a structure on it that is unoccupied and that does not have a current, existing Town of
Newport utility account in effect.
Section 6. Bills Mailed or Delivered - Assignment of Charges
a. A stormwater bill will either be sent through the United States mail or delivered by an alternate method, notifying
each customer of the amount of the bill, the date the payment is due, and the date when past due. Failure to receive a
bill is not justification for non-payment.
b. Stormwater service charges shall be applied per customer. The owner of each parcel of developed land, however,
shall be ultimately obligated to pay such stormwater service charges if it is not paid by the customer.
c. Each residential customer who lives in a multi -family unit (i.e., more than two attached dwelling units) will be
charged the lowest residential service rate charge established by the Town Council.
d. Each non-residential customer will receive a service rate charge based on the amount of impervious surface they
occupy and use-(e.g., parking -lots, storage buildings). Unless evidence to the contrary is provided by the land owner
of the parcel which the non-residential customer is using, impervious surfaces that are not occupied structures will
be allocated proportionally based on the amount of impervious surfaces covered by the occupied structures. In any
case, however, each non-residential customer shall be charged no less than the lowest non-residential rate
established by the Town Council.
e. Each non-residential property or residential property that does not have a current utility account with the Town of
Newport will be billed directly to the owner of the parcel of land. In other words, the landowner becomes the
customer.
f. Where there is a mix of non-residential and residential uses on the same land parcel and/or in the same building,
the non-residential use shall be billed at the non-residential rate and the residential use shall be billed at the
residential rate established by the Town Council.
Section 7. Billing, Payment, Penalties
a. All stormwater service charges shall be billed monthly, and bills shall be mailed on a cycle basis
b. Every bill shall be due when mailed to the customer at the last address provided by the customer. A bill shall
reflect a due date of ten (10) days from the billing cycle shown on the bill.
c. A late payment penalty in the amount of five (5) percent per month shall be imposed upon any outstanding unpaid
balance twenty-five (25) days after the billing date shown on the bill. The late payment penalty will be reflected on
the bill rendered the following month.
d. Any customer who has a check or draft returned from any financial institution because of insufficient funds or a
closed account shall be charged a service fee in accordance with N.C.G.S. 25-3-512.
e. If the customer does not inform the Town of Newport Customer Service Office of any complaint concerning
accuracy of the bill(s) constituting the past due balance, and if the customer does not pay the past due balance within
thirty-two (32) days from the most recent billing date, the account is delinquent and the Town may pursue such
remedies as are available.

Section 8. Complaints Regarding Bill
a. A customer having a complaint about a bill should file written or verbal notice with the Town of Newport
Customer Service Department. If it is determined that the bill is in error, an adjustment will be determined by the
Stormwater Director based upon such evidence as he (or she) deems appropriate.
Section 9. Backbilling and Adjustment of Bills
a. If the Town determines that it has overcharged or undercharged a customer on account of its error, the Town shall
refund or recover the difference subject to the following:
1. The adjustment period shall be limited to the lesser of the actual period during which the error occurred
or twelve (12) months; and
2. The amount of adjustment shall be determined by the Stormwater Director based upon such evidence as
he (or she) deems appropriate; and
3. Any overcharge may be either refunded or credited to the customer and any undercharge shall be billed
to the customer.
b. If the Town determines that it has undercharged a customer on account of any unlawful or materially misleading
act of such customer, the undercharge shall be determined and collected as set out above except that the adjustment
period shall be the greater of the actual period during which the error occurred (up to thirty-six (36) months) or
twelve (12) months, if the adjustment period cannot be determined. The Town shall, in addition to collecting such
undercharge, have the right to take other action against such customer as is permitted by law.
Section 10. Charge, Duties, and Representation of the Committee
a. The committee shall have the following charges and duties:
1. Policv. Review and recommend to the Town Council stormwater management policies, policy changes,
long-range plans, and their budgetary and rate impacts.
2. Capital Improvements. Review and comment to the Town Council on capital improvement programs.
These capital improvement programs should be reviewed and evaluated on the basis of a comprehensive
stormwater quantity and quality management program in the Town of Newport.
3. Council and Staff Resource. Respond to Town Council and staff requests for advice on matters related to
the comprehensive stormwater quantity and quality management program in the Town of Newport
b. Committee members shall be appointed by resolution of the Town Council and shall have terms of one (1) year.
The Mayor, Town Manager, Town Planning and Inspections Director and the Town Stormwater Director will serve
as ex officio members of the Committee.
Section 11. Limitations of Responsibility
a. The Towns acquisition of storm drainage casements and/or the construction, maintenance or repair by the Town
of drainage facilities does not constitute a warranty against stormwater hazards including, but not limited to,
flooding, erosion, or standing water. Only drainage ways owned and maintained by the Town of Newport shall be
financed, operated, and/or maintained with revenues from the Stormwater Service Charges identified in this Policy.

Section 12. Interpretations to This Policy
a. In the event interpretations of this policy are deemed necessary, the Town Manager may make such interpretations
to provide additional administrative detail and clarity so that the spirit of this policy shall be observed, and public
safety and welfare secured.
Section 13. Severability,
a. If any section of this policy is held to be invalid or unenforceable, all other sections shall nevertheless continue in
full force and remain in effect.
This policy shall become effective on (Insert Date).

TOWN OF NEWPORT
UTILITY FEE STRUCTURE

Utility Fee Structure
Man & Fee Structure Table
The following table and accompanying map serve as the basis for the establishment of a
stormwater utility fee structure. This fee structure and cost per property has been established
based on the total impervious surface area located on each respective lot within the town's
corporate limits. This is the most equitable methodology available for establishing a stormwater
utility rate. Additionally, the map and fee structure can be easily updated within the context of
the permitting phase of a development project.
This map was produced based on aerial photography and field observations, and should
accurately reflect the impervious surface cover on each piece of developed property. The fee
listed for each developed property is based on the fee structure laid out in the preceding section
of this document. According to the information outlined in this report, the attached fee structure
will result in approximately $9,000 per month, or $108,000 per year in revenue. This utility may
only be established within the context of a municipal stormwater management program, and
therefore the revenues must be utilized to implement this program.

Town of Newport
Stormwater Management Program
Utility Fee Structure
Tax ID q
AREA(Sq. Ft.)
ACRES
Storm Water
Rate
Existing Land Use
Storm Water
Classification
633803207996000
29,276.43
0.672
$50.00
Commercial
Non -Residential
633811751432000
43,515.41
0.999
$60.00
Commercial
Non -Residential
633815742783000
38,402.89
0.882
$50.00
Commercial
Non -Residential
633815744336000
9,443.76
0.217
$25.00
Commercial
Non -Residential
633815744503000
45,149.19
1.036
$60.00
Commercial
Non -Residential
633816729918000
14.75
0.000
$15.00
Commercial.
Non -Residential
633816736680000
6,850.59
0.157
$25.00
Commercial
Non -Residential
633816736839000
11,703.47
0.269
$25.00
Commercial
Non -Residential
633816737312000
113,007.56
2.594
$125.00
Commercial
Non -Residential '
633816738164000
24,003.46
0.551
$50.00
Commercial
Non -Residential
633816745257000
6,492.18
0.149
$25.00
Commercial
Non -Residential
633816746009000
15,422.02
0.354
$25.00
Commercial
Non -Residential
633816749579000
15,445.65
0.3551
$25.00
Commercial
Non -Residential
633816840217000
29,903.31
0.6861
$50.00
Commercial
Non -Residential
633816945576000
-77,996.08
1.7911
$60.00
Commercial
Non -Residential
633820801119000
244,577.88
5.615
$125.00
Commercial
Non -Residential
633820805449000
10.59
0.000
$15.00
Commercial
Non -Residential
633820807532000
36,070.09
0.828
$50.00
Commercial
Non -Residential
634701276091000
39,374.41
0.904
$50.00
Commercial
Non -Residential
634701362958000
31,644.93
0.726
$50.00
Commercial
Non -Residential
634805071928000
45,283.42
1.040
$60.00
Commercial
Non -Residential
634809250280000
520.32
0.012
$15.00
Commercial
Non -Residential
634809251262000
988.57
0.023
$15.00
Commercial
Non -Residential
634809261582000
17,765.84
0.408
$25.00
Commercial
Non -Residential
634809263016000
18,793.92
0.431
$25.00
Commercial
Non -Residential
634809274110000
2,385.48
0.055
$25.00
Commercial
Non -Residential
634810255889000
5,586.79
0.128
$25.00
Commercial
Non -Residential
634810255894000
3,058.99
0.070
$25.00
Commercial
Non -Residential
634810255977000
1,845.84
0.042
$25.00
Commercial
Non -Residential
634810256466000
14,091.00
0.323
$25.00
Commercial
Non -Residential
634810256714000
14,701.78
0.338
$25.00
Commercial
Non -Residential
634810265069000
12,379.67
0.284
$25.00
Commercial
Non -Residential
634810265158000
6,913.46
0.159
$25.00
Commercial
Non -Residential
634810265248000
12,832.65
0.295
$25.00
Commercial
Non -Residential
634810265348000
18,171.50
0.417
$25.00
Commercial
Non -Residential
634810265435000
5,431.55
0.125
$25.00
Commercial
Non -Residential
634810265530000
4,388.27
0.101
$25.00
Commercial
Non -Residential
634810265538000
5,546.32
0.127
$25.00
Commercial
Non -Residential
634813036229000
793.27
0.018
$25.00
Commercial
Non -Residential
634813040526000
2,110.54
0.048
$25.00
Commercial
Non -Residential
634813041025000
2,399.90
0.055
$25.00
Commercial
Non -Residential
634813041360000
2,976.80
0.068
$25.00
Commercial
Non -Residential
Page 1 of 31

Town of Newport
Stormwater Management Program
Utility Fee Strucfure
Tax ID #
AREA(Sq. Ft.)
ACRES
Storm Water
- Rate
Existing Land Use
Storm Water
Classification
634813041561000
10,007.27
0.230
$25.00
Commercial
Non -Residential
634813043408000
20,532.25
0.471
$50.00
Commercial
Non -Residential
634813043590000
980.92
0.023
$25.00
Commercial
Non -Residential
634813044413000
14,086.22
0.323
$25.00
Commercial
Non -Residential
634813044510000
937.72
0.022
$25.00
Commercial
Non -Residential
634813044530000
983.83
0.023
$25.00
Commercial
Non -Residential
634813044550000
814.93
0.019
$25.00
Commercial
Non -Residential
634813045433000
25,871.60
0.594
$50.00
Commercial
Non -Residential
634813047400000
2,225.58
0.051
$25.00
Commercial
Non -Residential
634813048327000
4,839.04
0.111
$25.00
Commercial
Non -Residential
634813049356000
13,109.83
0.301
$25.00
Commercial
Non -Residential
634813137524000
1.82
0.000
$0.00
Commercial
Non -Residential
634813140343000
3,402.91
0.078
$25.00
Commercial
Non -Residential
634814235594000
4,123.54
0.095
$25.00
Commercial'
Non -Residential
634814235981000
6,603.92
0.152
_ $25.00
Commercial
Non -Residential
634814236844000
2,690.89
0.062
$25.00
Commercial
Nan -Residential
634814236849000
2,854.03
0.066
$25.00
Commercial
Non -Residential
634814245081000
965.27
0.022
$25.00
Commercial
Non -Residential
634814246256000
6,459.35
0.148
$25.00
Commercial
Non -Residential
634814246311000
2,398.73
0.055
$25.00
Commercial
Non -Residential
634814336055000
2,417.78
0.056
$25.00
Commercial
Non -Residential
634814343790000
18,411.97
0.423
$25.00
Commercial
Non -Residential
634817212017000
30,421.87
0.698
$50.00
Commercial
Non -Residential
633808980292000
1,384.88
0.032
$3.00
High Density Residential
Residential
633808981235000
1,548.00
0.036
$3.00
High Density Residential
Residential
633808981277000
1,652.29
0.038
$3.00
High Density Residential
Residential
633808981688000
3,038.22
0.070
$3.00
High Density Residential
Residential
633808982310000
1,443.92
0.033
$3.00
High Density Residential
Residential
633808983306000
1,743.61
0.040
$3.00
High Density Residential
Residential
633808983358000
2,053.75
0.047
$3.00
High Density Residential
Residential
633808984423000
1,541.65
0.035
$3.00
High Density Residential
Residential
633808984466000
1,735.40
0.040
$3.00
High Density Residential
Residential
633808985408000
1,317.41
0.030
$3.00
High Density Residential
Residential
633808985541000
1,871.00
0.043
$3.00
High Density Residential
Residential
633808985583000
1,217.29
0.028
$3.00
High Density Residential
Residential
633808986515000
2,033.01
0.047
$3.00
High Density Residential
Residential
633808986557000
1,593.72
0.037
$3.00
High Density Residential
Residential
633808987509000
1,743.69
0.040
$3.00
High Density Residential
Residential
633808987622000
1,440.52
0.033
$3.00
High Density Residential
Residential
633808987665000
1,926.13
0.044
$3.00
High Density Residential
Residential
633808988608000
2,165.101
0.0501
$3.00
High Density Residential lResidential
633808989967000
2,199.571
0.050
$100
High Density Residential lResidential
Page 2 of 31

Town of Newport
Stormwater Management Program
Utilitv Fee Structure
Tax ID #
AREA(Sq. Ft.)
ACRES
Storm Water
Rate
Existing Land Use
Storm Water
Classification
633808991326000
1,941.71
0.045
$3.00
High Density Residential
Residential
633808991629000
2,060.17
0.047
$3.00
High Density Residential
Residential
633808993375000
1,978.13
0.045
$3.00
High Density Residential
Residential
633808994219000
1,966.66
0.0451
$3.00
High Density Residential
Residential
633808994244000
1,941.09
0.045
$3.00
High Density Residential
Residential
633808996924000
2,415.06
0.055
$3.00
High Density Residential
Residential
633808997878000
3,022.12
0.069
$3.00
High Density Residential
Residential
633808998524000
2,596.58
0.060
$3.00
High Density Residential
Residential
633808999008000
2,479.17
0.057
$3.00
High Density Residential
Residential
633808999225000
2,266.91
0.052
$3.00
High Density Residential
Residential
634805080870000
2,359.70
0.0541
$3.00
High Density Residential
Residential
634805080933000
1,845.89
0.0421
$3.00
High Density Residential
Residential
634805082645000
2,067.82
' 0.047
$3.00
High Density Residential
Residential
634805082739000
2,207.89
0.051
$3.00
High Density Residential
Residential
634805082904000
2,262.09
0.052
$3.00
High Density Residential
Residential "
634805084514000
1,959.03
0.045
$3.00
High Density Residential
Residential
634805090332000
1,989.14
0.046
$3.00
High Density Residential
Residential
634805092849000
2,546.78
0.058
$3.00
High Density Residential
Residential
63480SO94357000
2,332.71
0.054
$3.00
High Density Residential
Residential
634805094419000
2,337.29
0.054
$3.00
High Density Residential
Residential
634805094422000
2,505.08
0.058
$3.00
High Density Residential
Residential
634805094578000
2,236.44
0.051
$3.00
High Density Residential
Residential
634805095101000
2,252.55
0.052
$3.00
High Density Residential
Residential .
634805095293000
3,040.17
0.070
$3.00
High Density Residential
Residential
634805097034000
2,334.25
0.054
$3.00
High Density Residential
Residential
634805179671000
1,939.42
0.045
$3.00
High Density Residential
Residential
634805197049000
1,577.75
0.036
$3.00
High Density Residential
Residential
634805197135000
9,623.24
0.221
$3.00
High Density Residential
Residential
634805197170000
771.12
0.018
$3.00
High Density Residential
Residential
634805197192000
837.00
0.019
$3.00
High Density Residential
Residential
634805198104000
1,327.94
0.030
$3.00
High Density Residential
Residential
634805198157000
1,071.34
0.025
$3.00
High Density Residential
Residential
634805198178000
948.91
0.022
$3.00
High Density Residential
Residential
634805198254000
7,238.64
0.166
$3.00
High Density Residential
Residential
634805198280000
921.13
0.021
$3.00
High Density Residential
Residential
634805199079000
8,309.47
0.191
$3.00
High Density Residential
Residential
634805199201000
1,034.86
0.024
$3.00
High Density Residential
Residential
634805280919000
6,691.28
0.154
$3.00
High Density Residential
Residential
634805280989000
1,184.11
0.027
$3.00
High Density Residential
Residential
634805280997000
1,427.82
0.033
$3.00
High Density Residential
IResidential
6348052818790001
963.96
0.022
$3.00
High Density Residential
IResidential
634805281881000
7,603.24
0.175
$3.001
High Density Residential
lResidential
Page 3 of 31

Town of Newport
Stormwater Management Program
Utility Fee Structure
Tax ID #
AREA(Sq. Ft.)
ACRES
Storm Water
Rate
Existing Land Use
Storm Water
Classification
634805281898000
661.72
0.015
$3.00
High Density Residential
Residential
634805281932000
830.72
0.019
$3.00
High Density Residential
Residential
634805281950000
1,009.25
0.023
$3.00
High Density Residential
Residential
634805282895000
1,118.82
0.026
$3.00
High Density Residential
Residential
634805283825000
1,160.97
0.027
$3.00
High Density Residential
Residential
634805283856000
1,053.00
0.024
$3.00
High Density Residential
Residential
634805283877000
1,184.88
0.027
$3.00
High Density Residential
Residential
634805283921000
9,507.42
0.218
$3.00
High Density Residential
Residential
634805284961000
1,152.41
0.026
$3.00
High Density Residential
Residential
634805284981000
1,078.71
0.025
$3.00
High Density Residential
Residential
634805290054000
1,204.27
0.028
$3.00
High Density Residential
Residential
634805290071000
1,227.49
0.028
$3.00
High Density Residential
Residential
634805290130000
1,517.46
0.035
$3.00
High Density Residential
Residential
634805290133000
1,090.15
0.025
$3.00
High Density Residential
Residential
634805290135000
11159.64
0.027
$3.00
High Density Residential
Residential
634805290138000
1,171.36
0.027
$3.00
High Density Residential
Residential
634805290471000
8,442.42
0.1941
$3.00
High Density Residential
Residential
634805291194000
1,253.17
0.029
$3.00
High Density Residential
Residential
634805291196000
1,041.44
0.024
$3.00
High Density Residential
Residential
634805291359000
1,158.13
0.027
$3.00
High Density Residential
Residential
634805291367000
1,210.97
0.028
$3.00
High Density Residential
Residential
634805291374000
1,428.33
0.033
$3.00
High Density Residential
Residential
634805291442000
11.37
0.000
$3.00
High Density Residential
Residential
634805292025000
1,114.22
0.026
$3.00
High Density Residential
Residential
634805292054000
907.43
0.021
$3.00
High Density Residential
Residential
634805292073000
957.96
0.022
$3.00
High Density Residential
Residential
634805292091000
1,210.28
0.028
$3.00
High Density Residential
Residential
634805292109000
1,014.47
0.023
$3.00
High Density Residential
Residential
634805292201000
921.35
0.021
$3.00
High Density Residential
Residential
634805292264000,
6,024.91
0.138
$3.00
High Density Residential
Residential
634805293083000
1,253.00
0.029
$3.00
High Density Residential
Residential
634805293160000
4,498.93
0.103
$3.00
High Density Residential
Residential
634805293189000
1,176.05
0.027
$3.00
High Density Residential
Residential
634805293196000
1,347.47
0.031
$3.00
High Density Residential
Residential
634805293281000
1,185.79
0.027
$3.00
High Density Residential
Residential
634805293284000
844.67
0.019
$3.00
High Density Residential
Residential
634805293298000
7,055.75
0.162
$3.00
High Density Residential
Residential
634805293928000
6,476.71
0.149
$3.00
High Density Residential
Residential
634805294014000
955.03
0.022
$3.00
High Density Residential
Residential
634805294035000
928.83
0.021
$3.00
High Density Residential
Residential
634805294056000
950.97
0.022
$3.001
High Density Residential
Residential
634806284967000
1 11,426.421
0.2621
$3.001
High Density Residential lResidential
Page'4 of 31

Town of Newport
Stormwater Management Program
Utility Fee Structure
Tax ID q
AREA(Sq. Ft.)
ACRES
Storm Water
Rate
Existing Land Use
Storm Water
Classification
634806285913000
1,086.86
0.025
$3.00
High Density Residential
Residential
634806285934000
1,108.26
0.025
$3.00
High Density Residential
Residential
634806286916000
1,103.87
0.025
$3.00
High Density Residential
Residential
634806286938000
956.71
0.022
$3.00
High Density Residential
Residential
634806295186000
725.11
0.017
$3.00
High Density Residential
Residential
634806296041000
803.80
0.018
$3.00
High Density Residential
Residential
634806296105000
805.52
0.018
$3.00
High Density Residential
Residential
634806296112000
866.04
0.020
$3.00
High Density Residential
Residential
634806296130000
1,106.80
0.025
$3.00
High Density Residential
Residential
634806296184000
6,931.86
0.159
$3.00
High Density Residential
Residential
634809166839000
2,372.41
0.0541
$3.00
High Density Residential
Residential
634809173153000
10,729.63
0.246
$3.00
High Density Residential
Residential
634809173225000
3.28
0.000
$3.00
High Density Residential
Residential
634809178228000
2,920.37
0.067
$3.00
High Density Residential
Residential
634809179306000
11,698.55
0.269
$3.00
High Density Residential
Residential
634809179360000
2,976.60
0.068
$3.00
High Density Residential
Residential
634810256246000
1,846.41
0.042
$3.06
High Density Residential
Residential
634810257207000
3,647.18
0.084
$3.00
High Density Residential
Residential
634813143892000
26.80
0.001
$3.00
High Density Residential
Residential
634813144756000
3,625.28
0.083
$3.00
High Density Residential
Residential
634813145409000
2,688.65
0.062
$3.00
High Density Residential
Residential
634813145707000
678.66
0.016
$3.00
High Density Residential
Residential
634813145756000
1,747.28
0.040
$3.00
High Density Residential
Residential
634813149874000
1,601.13
0.037
$3.00
High Density Residential
Residential
634813244226000
1,960.92
0.045
$3.00
High Density Residential
Residential
634813244566000
1,505.77
0.035
$3.00
High Density Residential
Residential
634814237745000
790.95
0.018
$3.00
High Density Residential
Residential
634814245110000
3,468.72
0.080
$3.00
High Density Residential
Residential
634814245452000
1,707.96
0.039
$3.00
High Density Residential
Residential
634814246329000
2,974.25
0.068
$3.00
High Density Residential
Residential
634814248458000,
990.70
0.023
$3.00
High Density Residential
Residential
634814248629000
4,931.55
0.113
$3.00
High Density Residential
Residential
634814249203000
2,422.83
0.056
-$3.00
High Density Residential
Residential
634814340144000
2,010.98
0.046
$3.00
High Density Residential
Residential
634814340197000
1,232.36
0.028
$3.00
High Density Residential
Residential
634814341148000
2,843.26.
0.065
$3.00
High Density Residential
Residential
634814341496000
9,441.42
0.217
$3.00
High Density Residential
Residential
634814342550000
0.38
0.000
$3.00
High Density Residential
Residential
634817202633000
2,793.66
0.064
$3.00
High Density Residential
Residential
634917000174000
2,876.20
0.066
$3.00
High Density Residential
Residential
634917000239000
1,869.00
0.0431
$3.00
High Density Residential lResidential
Y
5,798.271
0.1331
$3.00
High Density Residential lResidential
Page 5 of 31

Town of Newport
Stormwater Management Program
Utilitv Fee Structure
Tax ID #
AREA(Sq. Ft.)
ACRES
Storm Water
Rate
Existing Land Use
Storm Water
Classification
633808983481000
1,788.78
0.041
$3.00
High Density Residential
Residential
633920904765000
12,875.87
0.296
$25.00Industrial
Non -Residential
634809058052000
5,037.87
0.116
$25.00Industrial
Non -Residential
634809153409000
533,528.56
12.248
$125.00Industrial
Non -Residential
00 000
783.83
0.018
$3.00
Low Density Residential
Residential
00 000
187.15
0.004
$3.00
Low Density Residential
Residential
633808876670000
2,465.35
0.057
$5.00
Low Density Residential
Residential
633808877644000
2,219.27
0.051
$4.00
Low Density Residential
Residential
633808878609000
2,379.57
0.055
$5.00
Low Density Residential
Residential
633808878765000
1,943.81
0.045
$4.00
Low Density Residential
Residential
633808879803000
2,047.80
0.047
$4.00
Low Density Residential
Residential
633808879973000
1,899.70
0.044
$4.00
Low Density Residential
Residential
633908970529000
2,567.69
0.059
$5.00
Low Density Residential
Residential
633808970795000
2,548.58
0.059
$5.00
Low Density Residential _
Residential
633808973734000
11,770.67
0.270
$5.00
Low Density Residential
Residential
633808982071000
2,012.23
0.046
$4.00
Low Density Residential
Residential
633808984100000
2,602.61
0.060
$5.00
Low Density Residential
Residential
633808984174000
2,097.81
0:048
$4.00
Low Density Residential
Residential
633808985240000
2,211.51
0.051
$4.00
Low Density Residential
Residential
633808986215000
2,446.40
0.056
$5.00
Low Density Residential
Residential
633808986380000
2,113.22
0.049
$4.00
Low Density Residential
Residential
633808987365000
3,109.33
0.071
$5.00
Low Density Residential
Residential
633808988430000
3,124.07
0.072
$5.00
Low Density Residential
Residential
633808989406000
2,121.15
0.049
$4.00
Low Density Residential
Residential
633808993977000
2,395.68
0.055
$5.00
Low Density Residential
Residential
633811656474000
936.94
0.022
$3.00
Low Density Residential
Residential
633811764544000
4,425.78
0.102
$5.00
Low Density Residential
Residential
633812757126000
4,048.32
0.093
$5.00
Low Density Residential
Residential
633812757447000
1,679.61
0.039
$4.00
Low Density Residential
Residential
633812758132000
3,682.98
0.085
$5.00
Low Density Residential
Residential
633812758317000
3,298.32
0.076
$5.00
Low Density Residential
Residential
633812759289000
3,074.58
0.071
$5.00
Low Density Residential
Residential
633812759323000
4,076.83
0.094
$5.00
Low Density Residential
Residential
633812765650000
2,623.72
0.060
$5.00
Low Density Residential
Residential
633812766633000
2,541.18
0.058
$5.00
Low Density Residential
Residential
633812768463000
2,651.13
0.061
$5.00
Low Density Residential
Residential
633812769459000
2,180.62
0.050
$4.00
Low Density Residential
Residential
633812850055000
3,008.62
0.069
$5.00
Low Density Residential
Residential
633812850264000
5,254.66
0.121
$5.00
Low Density Residential
Residential
633812851198000
3,700.43
0.085
' $5.00
Low Density Residential
Residential
633812852015000
4,109.92
0.0941
$5.00
Low Density Residential
lResidential
633812852434000
4,268.691
0.0981
$5.00
Low Density Residential
lResidential
Page 6 of 31

Town of Newport
Stormwater Management Program
Utility Fee Structure
Tax ID #
AREA(Sq. Ft.)
ACRES-
Storm Water
Rate
Existing Land Use
Storm Water
Classification
633812853317000
2,323.71
0:053
$5.00
Low Density Residential
Residential
633812854056000
1,633.11
0.037
$4.00
Low Density Residential
Residential
633812854158000
3,156.76
0.072
$5.00
Low Density Residential
Residential
633812855096000
938.03
0.022
$3.00
Low Density Residential
Residential
633812855291000
4,140.08
0.095
$5.00
Low Density Residential
Residential '
633812857211000
2;878.77
0.066
$5.00
Low Density Residential
Residential
633812858262000
4,079.79
0.094
$5.00
Low Density Residential
Residential
633812860508000
2,606.72
0.060
$5.00
Low Density Residential
Residential
633812861625000
4,566.96
0.105
$5.00
Low Density. Residential
Residential
633812862319000
4,093.38
0.094
$5.00
Low Density Residential
Residential
633812862611000
4,444.93
0.102
$5.00
Low Density Residential
Residential
633812863412000
3,587.68
0.082
$5.00
Low Density Residential
Residential
633812863630000
2,444.49
0.056
$5.00
Low Density Residential
Residential
633812865634000
4,383.05
0.101
$5.00
Low Density Residential
Residential
633812867555000
3,145.43
0.072
$5.00
Low Density Residential
Residential
633812868583000
3,148.34
0.072
$5.00
Low Density Residential
Residential
633812871281000
2,459.06
0.0561
$5.00
Low Density Residential
Residential
633812872256000
2,696.45
0.062
$5.00
Low Density Residential
Residential
633812873322000
2,540.82
0.058
$5.00
Low Density Residential
Residential
633812874462000
1,948.72.
0.045
$4.00
Low Density Residential
Residential
633812875169000
2,358.94
0.054
$5.00
Low Density Residential
Residential
633812875455000
2,948.46
0.068
$5.00
Low Density Residential
Residential
633812876237000
2,922.07
. 0.067
$5.00
Low Density Residential
Residential
633812877357000
2,154.26
0.049
$4.00
Low Density Residential
Residential
633812879465000
2,669.34
0.061
$5.00
Low Density Residential
Residential
633812950244000
4,069.97
0.093
$5.00
Low Density Residential
Residential
633812951277000
4,009.21
0.092
$5.00
Low Density Residential
Residential
633812960526000
4,349.40
0.100
$5.00
Low Density Residential
Residential
633812962183000
2,407.55
0.055
$5.00
Low Density Residential
Residential
633812962530000
2,445.66
0.056
$5.00
Low Density Residential
Residential
633812962643000
3,162.51
0.073
$5.00
Low Density Residential
Residential
633812962933000
11,903.42
0.273
$5.00
Low Density Residential
Residential
633812963334000
2,857.87
0.066
$5.00
Low Density Residential
Residential
633812964147000
2,054.99
0.047
$4.00
Low Density Residential
Residential
633812964489000
3,164.32
0.073
$5.00
Low Density Residential
Residential
633812964686000
118.54
0.003
$3.00
Low Density Residential
Residential
633812965927000
7,578.68
0.174
$5.00
Low Density Residential
Residential
633812966549000
2,469.07
0.057
$5.00
Low Density Residential
Residential
633812968857000
2,265.05
0.052
$4.00
Low Density Residential
Residential
633812969065000
2,552.10
0.059
$5.00
Low Density Residential
Residential
633812970203000
2,422.80
0.056
$5.00
Low Density Residential
Residential
633812970303000
2,456,20F
0.056
$5.00
Low Density Residential
Residential
Page 7 of 31

Town of Newport
Stormwater Management Program
Utilitv Fee Structure
Tax ID tf
AREA(Sq. Ft.)
ACRES
Storm Water
Rate
Existing Land Use
Storm Water
Classification
633816846975000
3,317.49
0.076
$5.00
Low Density Residential-
Residential
633816847964000
4,004.80
0.092
$5.00
Low Density Residential
Residential
633816849914000
4,199.53
0.096
$5.00
Low Density Residential
Residential'
633816941744000
5,809.53
0.133
$5.00
Low Density Residential
Residential
634805073627000
1,887.51
0.043
$4.00
Low Density Residential
Residential
634805079918000
2,423.41
. 0.056
$5.00
Low Density Residential
Residential
634805085240000
3,000.49
0.069
$5.00
Low Density Residential
Residential
634805087631000
2,961.49
0.068
$5.00
Low Density Residential
Residential
634805088296000
2,170.64
0.050
$4.00
Low Density Residential
Residential
634805089083000
132.35
0.003
- $3.00
Low Density Residential
Residential
634805089362000
2,232.82
0.051
$4.00
Low Density Residential
Residential
634805099011000
2,998.17
0.069
$5.00
Low Density Residential
Residential
634805099244000
2,478.10
0.057
$5.00
Low Density Residential
Residential
634805099762000
2,717.06
0.062
$5.00
Low Density Residential
Residential
634805178586000
2,062.72
0.047
$4.00
Low Density' Residential
Residential
634805179831000
7,684.63
0.176
$5.00
Low Density Residential
Residential
634805180467000
1,994.99
0.046
$4.00
Low Density Residential
Residential
634805181563000
429.69
0.010
- $3.00
Low Density Residential
Residential
634805182547000
2,624.89
0:060
$5.00
Low Density Residential
Residential
634805182973000
1,542.03
0.035
$4.00
Low Density Residential
Residential
634805185588000
1,583.02
0.036
$4.00
Low Density Residential
Residential
634805191019000
2,181.04
0.050
$4.00
Low Density Residential
Residential
634805192365000
7,880.55
0.1811
$5.00
Low Density Residential
Residential
634805194069000
2,547.16
0.0581
$5.00
Low Density Residential
Residential
634805194514000
989.23,
0.0231
$3.60
Low Density Residential
Residential
634805271621000
2,545.04
0.0581
$5.00
Low Density Residential
Residential
634805273865000
10,616.03
0.244
$5.00
Low Density Residential
Residential
634806279917000
'2,904.44
0.067
$5.00
Low Density Residential
Residential
634806285169000
3,156.83
0.072
$5.00
Low Density Residential
Residential
634806286565000
2,228.96
0:051
$4.00
Low Density Residential
Residential
634806287441000
3,070.42
0.070
$5.00
Low Density Residential
Residential
634806287558000
2,440.79
'0.056
$5.00
Low Density Residential
Residential
634806288495000
3,176.82
0.073
$5.00
Low Density Residential
Residential
634806371803000
3,061.73
0.070
-$5.00
Low Density Residential
Residential
634806374427000
3,164.45
0.673
$5.00
Low Density Residential
Residential
634806374558000
3,165.64
0.073
$5.00
Low Density Residential
Residential
634806380667000
2,876.94
0.066
$5.00
Low Density Residential
Residential
634806381084000
2,952.20
0.068
'$5.00
Low Density Residential
Residential
634806384143000
3,184.27
0.0731
$5.00
Law Density Residential
Residential
634809057367000
4,915.12
0.113
$5.00
Low Density Residential
Residential
634809057488000
2,725.94
0.0631
$5.00
Low Density Residential
Residential
634809060632000
2,514.91
0'058
$5.001
Low Density Residential
Residential
Page'8 of 31

Town of Newport
Stormwater Management Program
Utilitv Fee Structure
Tax ID #
AREA(Sq. Ft.)
ACRES
Storm Water
Rate
Existing Land Use
Storm Water
Classification.
634809061551000
2,646.53
0.061
$5.00
Low Density Residential
Residential
634809062204000
2,796.20
0.064
$5.00
Low Density Residential
Residential.
634809062579000
2,862.73
0.066
$5.00
Low Density Residential.
Residential '
634809064172000
2,844.94
0.065
$5.00
Low -Density Residential
Residential
634809065013000
1,817.79
0.042
$4.00
Low Density Residential
Residential
634809071296000
3,042.89
0.070
$5.00
Low Density Residential
Residential
634809072326000
2,856.48
0.066
$5.00
Low Density Residential
Residential
634809075290000
2,907.10
0.067
$5.00
Low Density Residential
Residential
634809076160000
2,914.89
0.067
$5.00
Low Density Residential
Residential
634809168664000
7,205.89
0.165
$5.00
Low Density Residential
Residential
634809170480000
10,014.19
0.230
$5.00
Low Density Residential
Residential
634809172482000
7,778.30
0.179
$5.00
Low Density Residential
Residential
634809178198000
12,314.30
0.283
$5.00
Low Density Residential
Residential
634809254059000
3,069:61
0.070
$5.00
Low DensityResidential
Residential
634809254276000
4,338.52
0.100
$5.00
Low Density Residential
Residential
634809262604000
455.64
0.010
$3.00
Low Density Residential
Residential
634809262752000
2,347.27
0.054
$5.00
Low Density Residential
Residential
634809263616000
869.07
0.020
$3.00
Low Density Residential
Residential
634810257065000
2,989.48
0.069
$5.00
Low Density Residential
Residential
634810257175000
1,898.44
0.044
$4.00
Low Density Residential
Residential
634810258209000
3,629.16
0.083
. $5.00
Low Density Residential
Residential
634810258394000
3,623.80
0.083
$5.00
Low Density Residential
Residential
634810266525000
2,696.45
0.062
$5.00
Low Density Residential
Residential
634810277009000
1,957.65
.0:045
$4.00
Low Density Residential
Residential
634810277322000
3,154.16
0.072
$5.00
Low Density Residential
Residential
634810278195000
8,407.86
0.193
$5.00
Low Density Residential
Residential
634810350198000
5,129.94
0.118
$5.00
Low Density Residential
Residential
634810350393000
3,299.55
0.076
$5.00
Low Density Residential
Residential
6348103.51028000
3,822.48
0.088
$5.00
Low Density Residential
Residential
634810352496000
5,273.21
0.121
$5.00
Low Density Residential
Residential.
634810353123000
2,626.15
0.060
$5.00
Low Density Residential
Residential
634810354172000
1,565.35
0.036
$4.00
Low Density Residential
Residential
634810361565000
5,088.50
0.117
$5.00
Low Density Residential
Residential
634810369654000
6,815.57
0.156
$5.00
Low Density Residential
Residential
634810371249000
10,957.31
0.252
$5.00
Low Density Residential
Residential
634810372420000
2,700.29
' .0.062
$5.00
Low Density Residential
Residential
634810372448000
2,584.73
0.059
$5.00
Low Density Residential
Residential
634813142720000
1,602.14
0.037
$4.00
Low Density Residential
Residential
634813146272000
3,093.09
0.071
$5.00
Low Density Residential
Residential
634813148475000
1,544.45
0.035
$4.00
Low Density Residential
IResidential
634813240450000
2,306.48
,0.053
$4.00
Low Density Residential
IResidentiall
634813241564000
5,195.421
0.1191
$5.00
Low Density Residential
IResidential
Page 9 of 31

Town of Newport
Stormwater Management Program
Utility Fee Structure
Tax ID#
AREA(Sq. Ft.)
ACRES
Storm Water
Rate
Existing'Land Use
Storm Water
Classification
634813242306000
3,261.00
0.075
$5.00
Low Density Residential
Residential
634814245658000
5,854.68
0.134
$5.00
Low Density Residential
Residential
634814245852000
7,446.95
0.171
$5.00
Low Density Residential
Residential
634814245945000
6,002.82
0.138
$5.00
Low Density Residential
Residential
634814247958000
4,115.07
0.094
$5.00
Low Density Residential
Residential
634814247983000
2,432.79
0:056
1$5:00
Low Density Residential
Residential
634814248323000
4,477.76
0.103
$5.00
Low Density Residential
Residential
634814248545000
2,793.31
0.064
$5.00
Low Density Residential
Residential
634814249369000
4,234.46
0.097
$5.00
Low Density Residential
Residential
634814328760000
2,468.42
0.057
$5.00
Low Density Residential
Residential
634814340460000
2,623.42
0.060
$5.00
Low Density Residential
Residential
634814340899000
2,717.65
0.062
$5.00
Low Density Residential
Residential
634814340967000
2,898.37
0.067
$5.00
Low Density'Residential
Residential
634814341640000
6,732.79
0.155
$5.00
Low Density Residential
Residential
634814341710000
3,201.16
0.073
$5.00
Low Density Residential
Residential
634814343594000
1,987.87
0.046
$4.00
Low Density Residential
Residential
634814343867000
4,486.55
0.103
$5.00
Low Density Residential
Residential
634814345308000
3,401.10
0.078
$5.00
Low Density Residential
Residential
634814349136000
2,738.65
0.063
$5.00
Low Density Residential
Residential
634814428528000
2,474.48
0.057
$5.00
Low Density Residential
Residential
634814440118000
2,304.90
0.053
$4.00
Low Density Residential
Residential
634814442255000
4,016.60
0.092
$5.00
Low Density Residential
Residential
634814444343000
4,174.29
0.096
$5.00
Low Density Residential
Residential
634815520598000
11,151.78
0.256
$5.00
Low Density Residential
Residential
634917000533000
2,620.38
0.060
$5.00
Low Density Residential
Residential
634809264939000
5,208.19
0.120
$5.00
Low Density Residential
Residential
634814343097000
4,470.46
0.103
$5.00
Low DensityResidential
Residential
634814441040000'
3,172.25
0.073
$5.00
Low Density Residential
Residential
00 000
3,395.33
0.078
$5.00
Low Density Residential
Residential
633808875586000'
, 3,394.27
0.078
$5.00
Low Density Residential
Residential
633808899122000
97,211.78
' 2.232
$5:00
Low Density Residential
Residential
633808972539000
5,692.94
0.131
$5.00
Low Density Residential
Residential
633808972809000
3,774.48
0.087
$5.00
Low Density Residential
Residential
633808974832000
6,486.02
0.149
$5.00
Low Density Residential
Residential
633808975536000
3,901.03
0.090
$5.00
Low Density.Residential
Residential
633808975839000
3,463.56
0.080
$5.00
Low Density Residential
Residential
633808976906000
7,090.02
0.163
$5.00
Low Density Residential
Residential
633808977609000
4,595.16
0.105
$5.00
Low Density Residential
Residential
633808977776000
4,257.19
0.098
$5.00
Low Density Residential
Residential
633808978851000
5,819.35
0.134
$5.00
Low Density Residential
Residential
633808979837000
3,939.66
0.0901
$5.00
Low Density Residential lResidential
633808987017000
3,217.301
0.0741
$5.00
Low Density Residential lResidential
Page 10 of 31

Town of Newport
Stormwater Management Program
IHilitd Fee Structure
Tax ID #
AREA(Sq. Ft.)
ACRES
Storm Water
Rate
Existing Land Use
Storm Water
Classi£cation
633808989372000
217.75
0.005
$3.00
Low Density Residential
Residential
633808999632000
3,184.01
0.073
$5.00
Low Density Residential
Residential
633811657451000
176,634.85
4.055
$5.00
Low Density Residential
Residential
633811657569000
6,022.96
0.138
$5.00
Low Density Residential,
Residential
633811764362000
3,045.74
0.070
$5.00
Low Density Residential
Residential
633812757546000
3,758.14
0.086
$5.00
Low Density Residential
Residential
633812757644000
1,336.54
0.031
$3.00
Low Density Residential
Residential
633812757732000
2,827.94
0.065
$5.00
Low Density Residential
Residential
633812757927000
5,722.86
0.131
$5.00
Low Density Residential
Residential
633812759038000
11,356.34
0.261
$5.00
Low Density Residential
Residential
633812759585000
2,085.42
0.048
$4.00
Low Density Residential
Residential
633812759695000
2,010.21
0.046
$4.00
Low Density Residential
Residential
633812759793000
1,871.00
0.043
$4.00
Low Density Residential
Residential
633812759891000
2,353.35
0.054
$5.00
Low Density Residential
Residential
633812759971000
3,623.41
0.083
1$5.00
Low Density Residential
Residential
633812765278000
2,532.94
0.058
$5.00
Low Density Residential
Residential
633812766371000
2,675.15
0.0611
$5.00
Low Density Residential
Residential
633812766698000
4,455.66
0.1021
$5.00
Low Density Residential
Residential
633812767088000
2,161.90
0.050
$4.00
Low Density Residential
Residential
633812767377000
2,270.89
0.052
$4.00
Low Density Residential
Residential
633812767753000
2,663.74
0.061
$5.00
Low Density Residential
Residential
633812767890000
2,056.44
0.047
$4.00
Low Density Residential
Residential
633812768173000
2,133.18
0.049
$4.00
Low Density Residential-
Residential
633812768848000
2,443.00
0.056
$5.00
Low Density Residential .
Residential
633812769139000
8,917.81
0.205
$5.00
Low Density Residential
Residential
633812769905000
2,293.39
0.053
$4.00
Low Density Residential
Residential
633812779073000
3,451.64
0.079
$5.00
Low Density Residential
Residential
633812850582000
4,157.67
0.095
$5.00
Low Density Residential
Residential
633812851458000
2,108.44
0.048
$4.00
Low Density Residential
Residential
633812852683000
2,334.65
0.054
$5.00
Low Density Residential
Residential
633812852701000
2,415.66
0.055
$5.00
Low Density Residential
Residential
633812852812000
3,834.28
0.088
$5.00
Low Density Residential
Residential
633812853932000
3,339.70
0.077
$5.00
Low Density Residential
Residential
633812854424000
4,040.79
0.093
$5.00
Low Density Residential
Residential
633812854621000
2,234.33
0.051
$4.00
Low Density Residential
Residential
633812854955000
3,033.69
0.070
$5.00
Low Density Residential
Residential
633812855456000
2,836.05
0.065
$5.00
Low Density Residential
Residential
633812855647000
- 2,806.07
0.064
$5.00
Low Density Residential
Residential
633812855942000
2,241.60
0.051
$4.00
Low Density Residential
Residential
633812886468000
2,939.67
0.067
$5.00
Low Density Residential
Residential
633812856648000
2,209.64
0.051
$4.00
Low Density Residential
Residential
633812856922000
2,632.90
0.060
$5.00
Low Density Residential
IResidential
Page 11 of 31

Town of Newport
Stormwater Management Program
Utility Fee Structure
•
Tax ID #
AREA(Sq. Ft.)
ACRES
Storm Water
Rate
Existing Land Use
Storm Water
Classification
633812857637000
2,709.10
0.062
$5.00
Low Density Residential
Residential
633812857901000
3,000.87
0.069
$5.00
Low Density Residential
Residential
633812857980000
2,519.27
0.058
$5.00
Low Density Residential
Residential
633812858428000
4,156.64
0.095
$5.00
Law Density Residential
Residential
633812858960000
2,771.45
0.064
$5.00
Low Density Residential
Residential
633812859590000
7,934.19
0.182
-$5.00
Low Density Residential
Residential
633812859859000
923.18
0.021
$3.00
Low Density Residential
Residential
633812860202000
3,379.03
0.078
$5.00
Low Density Residential
Residential
633812860268000
3,644.33
0.084
$5.00
Low Density Residential
Residential
633812860722000
2,862.46
0.066
$5.00
Low Density Residential
Residential
633812861030000
3,976.32
0.0911
$5.00
Low Density Residential
Residential
633812861096000
2,574.75
0.0591
$5.00
Low Density Residential
Residential
633812861322000
655.37
0.0151
$3.00
Low Density Residential
Residential
633812861920000
3,499.59
0.080
$5.00
Low Density Residential
Residential
633812862160000
2,076.07
0.048
$4.00
Low Density Residential
Residential
633812862949000
2,575.17
0.059
$5.00
Low Density Residential
Residential
633812863804000
3,711.30
0.085
$5.00
Low Density Residential
Residential
633812864104000
4,049.05
0.093
$5.00
Low Density Residential
Residential
633812864183000
4,557.83
0.105
$5.00
Low Density Residential
Residential
633812864411000
2,302.42
0.053
$4.00
Low Density Residential
Residential
633812864490000
3,383.51
0.078
$5.00
Low Density Residential
Residential
633812864621000
2,536.43
0.058
$5.00
Low Density Residential
Residential
633812864806000
2,904.93
0.067
$5.00
Low Density Residential
Residential
633812864991000
21196.25
0.050
$4.00
Low Density Residential
Residential
633812865163000
4,554.88
0.105
$5.00
Low Density Residential
Residential
633812865957000
2,974.91
0.068
$5.00
Low Density Residential
Residential
633812866152000
3,802.71
0.087
$5.00
Low Density Residential
Residential
633812866338000
3,287.05
0.075
$5.00
Low Density Residential
Residential
633812866704000
2,566.18
0.059
$5.00
Low Density Residential
Residential
633812866890000
2,541.21
0.058
$5.00
Low Density Residential
Residential
633812867131000
2,753.49
0.063
$5.00
Low Density Residential
Residential
633812867615000
4,121.30
0.095
$5.00
Low Density Residential
Residential
633812868110000
2,822.53
0.065
$5.00
Low Density Residential
Residential
633812868307000
2,014.97
0.046
$4.00
Low Density Residential
Residential
633812868385000
4,000.74
0.092
$5.00
Low Density Residential
Residential
633812868934000
3,134.71
0.072
$5.00
Low Density Residential
Residential
633812869009000
4,366.13
0.100
$5.00
Low Density Residential
Residential
633812869089000
2,410.04
0.055
$5.00
Low Density Residential
Residential
633812869364000
5,729.82
0.132
$5.00
Low Density Residential
Residential
633812869806000
2,116.39
0.049
$4.00
Low Density Residential
Residential
633812869890000
2,751.67
0.063
$5.00
Low Density Residential
Residential
633812870049000
3,263.01
0.075
$5.001
Low Density Residential IResidentiai
Page 12 of 31

Town of Newport
Stormwater Management Program
Utilitv Fee Structure
Tax ID #
AREA(Sq. Ft.)
ACRES
Storm Water
Rate
Existing Land Use
Storm Water
Classification
633812871115000
2,632.91
0.060
$5.00
Low Density Residential
Residential
633812873043000
3,193.28
0.073
$5.00
Low Density Residential
Residential
633812873398000
4,980.66
0.114
$5.00
Low Density Residential
Residential
633812874019000
2,269.57
0.052
$4.00
Low Density Residential
Residential
633812874193000
4,208.03
0.097
$5.00
Low Density Residential
Residential
633812876032000
2,071.63
0.048
$4.00
Low Density Residential
Residential
633812877008000
2,572.15
0.059
$5.00
Low Density Residential
Residential
633812877157000
2,973.96
0.068
$5.00
Low Density Residential
Residential
633812879081000
2,359.91
0.054
$5.00
Low Density Residential
Residential
633812879192000
2,071.26
0.048
$4.00
Low Density Residential
Residential
633812950666000
2,173.94
0.050
$4.00
Low Density Residential
Residential
633812951526000
4,990.14
0.115
$5.00
Low Density Residential
Residential
633812952358000
3,161.49
0.073
$5.00
Low Density Residential
Residential
633812952864000
2,586.15
0.059
- $5.00
Low Density Residential
Residential
633812952964000
2,990.44
0.069
$5.00
Low Density Residential
Residential
633812953241000
9,715.01
0.223
$5.00
Low Density Residential
Residential
633812953710000
1,910.25
0.044
$4.00
Low Density Residential
Residential
633812954143000
8,092.12
0.186
$5.00
Low Density Residential
Residential
633812954521000
4,981.24
0.114
$5.00
Low Density Residential
Residential
633812954820000
2,419.68
0.056
$5.00
Low Density Residential
Residential
633812954994000
11,534.30
0.265
$5.00
Low Density Residential
Residential
633812955160000
2,671.56
0.061
$5.00
Low Density Residential
Residential
633812955441000
3,669.31
0.084
$5.00
Low Density Residential
Residential
633812955693000
4,208.38
0.097
$5.00
Low Density Residential
Residential
633812956068000
680.56
0.016
$3.00
Low Density Residential
Residential
633812956347000
5,788.76
0.133
$5.00
Low Density Residential
Residential
633812957066000
3,519.25
0.081
$5.00
Low Density Residential
Residential
633812957392000
8,028.92
0.184
$5.00
Low Density Residential
Residential
633812957749000
5,652.58
0.130
$5.00
Low Density Residential
Residential
633812958077000
1,123.35
0.026
$3.00
Low Density Residential
Residential
633812958409000
3,049.09
0.070
$5.00
Low Density Residential
Residential
633812958578000
3,255.43
0.075
$5.00
Low Density Residential
Residential
633812958940000
751.47
0.017
$3.00
Low Density Residential
Residential
633812959074000
3,528.60
0.081
$5.00
Low Density Residential
Residential
633812959265000
7,515.79
0.173
$5.00
Low Density Residential
Residential
633812959917000
5,552.76
0.127
$5.00
Low Density Residential
Residential
633812960067000
3,489.06
0.080
$5.00
Low Density Residential
Residential
633812960363000
2,780.45
0.064
$5.00
Low Density Residential
Residential
633812960730000
2,641.75
0.061
$5.00
Low Density Residential
Residential
633812961352000
4,062.06
0.093
$5.00
Low Density Residential
Residential
633812962072000
4,209.241
0.0971
$5.00
Low Density Residential IResidential
633812962332000
2,357.291
0.0541
$5.00
Low Density Residential IResidential
Page 13 of 31

Town of Newport
Stormwater Management Program
Utilitv Fee Structure -
Tax ID #
AREA(Sq. Ft.)
ACRES
Storm Water
Rate
Existing Land Use
Storm Water
Classification
633812962733000
4,306.87
0.099
$5.00
Low Density Residential
Residential
633812966058000
5,256.74
0.121
$5.00
Low Density Residential
Residential
633812966817000
5,231.06
0.120
$5.00
Low Density Residential.
Residential
633812967167000
3,620.75
0.083
$5.00
Low Density Residential
Residential
633812968244000
3,739.55
0.086
$5.00
Low Density Residential
Residential
633812968591000
2,890.54
0.066
$5.00
Low Density Residential
Residential
633812969321000
3,340.25
0.077
$5.00
Low Density Residential
Residential
633812969470000
4,481.77
0.103
$5.00
Low Density Residential
Residential
633812969828000
4,660.67
0.107
$5.00
Low Density Residential
Residential
633812972133000
4,026.01
0.092
$5.00
Low Density Residential
Residential
633812972222000
1,692.75
0.039
$4.00
Low Density Residential
Residential
633812972323000
4,836.10
0.111
$5.00
Low Density Residential
Residential
633812972423000
5,330.69
0.122
$5.00
Low Density Residential
Residential
633812975128000
5,171.88
0.119
$5.00
Low Density Residential
Residential
633812975326000
4,552.46
0.105
$5.00
Low Density Residential
Residential
633812975427000
5,365.18
0.123
$5.00
Low Density Residential
Residential
633816838407000
61.24
0.001
$3.00
Low Density Residential
Residential
633816844679000
108,425.22
2.489
$5.00
Low Density Residential
Residential
633816848652000
35,442.24
0.814
$5.00
Low Density Residential
Residential
633816941630000
12,109.89
0.278
$5.00
Low Density Residential
Residential
633816943549000
24,126.76
0.554
$5.00
Low Density Residential
Residential
633816944921000
23,852.08
0.548
$5.00
Low Density Residential
Residential
633816945898000
2,834.04
0.065
$5.00
Low Density Residential
Residential
633816947817000
3,077.40
0.071
$5.00
Low Density Residential
Residential
633816949802000
3,738.21
0.086
'$5.00
Low Density Residential
Residential
633819701413000
4,149.90
0.095
$5.00
Low Density Residential
Residential
634480372567000
5,024.62
0.115
$5.00
Low Density Residential
Residential
634805073556000
5,118.83
0.118
$5.00
Low Density Residential
Residential
634805075957000
4,408.91
0.101
$5.00
Low Density Residential
Residential
634805076777000
3,221.71
0.074
$5.00
Low Density Residential
Residential
634805077693000
3,520.31
0.081
$5.00
Low Density Residential
Residential
634805077877000
3,308.39
0.076
$5.00
Low Density Residential
Residential
634805078943000
5,009.34
0.115
$5.00
Low Density Residential
Residential
634805079790000
6,341.59
0.146
$5.00
Low Density Residential
Residential
634805083277000
3,952.46
0.091
$5.00
Low Density Residential
Residential
634805084148000
4,747.46
0.109
-$5.00
Low Density Residential
Residential
634805086023000
3,543.15
0.081
$5.00
Low Density Residential
Residential
634805086099000
4,750.73
0.109
$5.00
Low Density Residential
Residential
634805087165000
3,499.65
0.080
$5.00
Low Density Residential
Residential
634805088231000
3,474.53
0.080
$5.00
Low Density Residential
Residential
634805088456000
3,880.44
0.0891
$5.00
Low Density Residential lResidential
634805088761000
6,033.81
0.1391
$5.001
Low Density Residential IResidential
Page 14 of 31

Town of Newport
Stormwater Management Program
Utilitv Fee Structure
Tax ID q
AREA(Sq. Ft.)
ACRES
Storm Water
Rate
Existing Land Use
Storm Water
Classification-
634805089811000
5,468.48
0.126
$5.00
Low Density Residential
Residential
634805089910000
3,565.67
0.082
$5.00
Low Density Residential
Residential
634805176778000
7,082.99,
0.163
$5.00
Low Density Residential
Residential
634805178738000
4,708.36
0.108
$5.00
Low Density Residential
Residential
634805180068000
3,304.25
0.076
$5.00
Low Density. Residential
Residential
634805180667000
4,161.88
0.096
$5.00
Low Density Residential
Residential
634805181230000
3,252.83
. 0.075
$5.00
Low Density Residential
Residential
634805181736000
3,998.68
0.092
$5.00
Low Density Residential
Residential
634805183623000
4,532.43
0.104
$5.00
Low Density Residential
Residential
634805185160000
31190.82
0.073
$5.00
Low Density Residential
Residential
634805185977000
'1,072.67
0.025
$3.00
Low Density Residential
Residential
634805186827000
2,265.65
0.052
$4.00
Low Density Residential
Residential
634805186890000
816.06
0.019
$3.00
Low Density Residential
Residential
634805187684000
3,391.63
0.078
$5.00
Low Density Residential
Residential
634805187743000
3,063.11
0.070
$5.00
Low Density Residential
Residential
634805189795000
2,354.69
0.054
$5.00
Low Density Residential
Residential
634805189902000
3,643.06
0.084
$5.00
Low Density Residential
Residential
634805190100000
3,787.58
0.087
$5.00
Low Density Residential
Residential
634805190319000
941.91
' 0.022
$3.00
Low Density Residential
Residential
634805190558000
3,188.30
0.073
$5.00
Low Density Residential
Residential
634805191094000
3,352.83
0.077
$5.00
Low Density Residential
Residential
634805191550000
5,344.24
0.123
$5.00
Low Density Residential
Residential
634805193197000
5,381.89
0.124
$5.00
Low Density Residential
Residential
634805193243000
4,075.33
0.094
$5.00
Low Density Residential
Residential
634805195013000
1,882.63
0.043
$4.00
Low Density Residential
Residential
634805199391000
16,245.86
0.373
$5.00
Low Density Residential
Residential
6348051CO302000
2,801.24
0.064
$5.00
Low Density Residential
Residential
634805270875000
6,127.75
0.141
$5.00
Low Density Residential
Residential
634805270974000
4,121.21
0.095
$5.00
Low Density Residential
Residential
634805271533000
4,178.81
0.096
$5.00
Low Density Residential
Residential
634805273674000
5,276.18
0.121
$5.00
Low Density Residential
Residential
634805280044000
4,816.99
0.111
$5.00
Low Density Residential
Residential
634805281541000
4,173.49
0.096
$5.00
Low Density Residential
Residential
634805293375000
1,050.00
0.024
$3.00
Low Density Residential
Residential
634805293378000
950.00
0.022
$3.00
Low Density Residential
Residential
634805293401000
6,364.68
0.146
$5.00
Low Density Residential
Residential
634805293436000
922.84
0.021
$3.00
Low Density Residential
Residential.
634805293460000
950.00
0.022
$3.00
Low Density Residential
Residential
634806275635000
4,047.05
0.093
$5.00
Low Density Residential
Residential
634806277770000
3,769.66
0.087
$5.00
Low Density Residential
Residential
634806279752000
3,729.181
0.0861
$5.00
Low Density Residential
Residential
634806279878000
3,348.621
0.0771
$5.001
Low Density Residential IResidential
Page 15 of 31

Town of Newport
Stormwater Management Program
Utilitv Fee Structure
Tax ID k
AREA(Sq. Ft.)
ACRES
Storm Water
Rate
Existing Land Use
Storm Water
Classification
634806285121000
3,262.98
0.075
$5.00.
Low Density Residential
Residential
634806287017000
: 4,551.24
0.104
$5.00
Low Density Residential
Residential
634806287886000
1,716.57
0.039
$4.00
Low Density Residential
Residential
634806288180000
3,925.15
0.090
$5.00
Low Density Residential
Residential
634806288631000.
3,707.89
0.085
$5.00
Low Density Residential
Residential
634806288868000
2,856.66
0.066
$5.00
Low Density Residential
Residential
634806289613000
3,456.39
0.079
$5.00
Low Density Residential
Residential
634806289695000
3,080.14
'0.071
$5.00
Low Density Residential
Residential
634806289941000
2,457.26
0.056
$5.00
Low Density Residential
Residential
634806295247000
7.44
0.000
$3.00
Low Density Residential
Residential
634806295328000
1,250.00
0.029
$3.00
Low Density Residential
Residential
634806295413000
1,106.53
0.025
$3.00
Low Density Residential
Residential
634806295416000
1,094.25
0.025
$3.00
Low Density Residential
Residential
634806295421000
1,128.16
0.026
$3.00
Low Density Residential
Residential
634806295489000
9,267.52
0.213.
$5.00
Low Density Residential
Residential
634806296481060
2,797.74
0.064
$5.00
Low Density Residential
Residential
634806297320000
2,367.11
0.0541
$5.00
Low Density Residential
Residential
634806298135000
3,049.79
0.0701
$5.00
Low Density Residential
Residential
634806298529000
3,744.28
0.0861
$5.00
Low Density Residential
Residential
634806299007000
3,550.46
0.082
$5.00
Low Density Residential
Residential
634806299394000
2,944.56
0.068
$5.00
Low -Density Residential
Residential
634806299453000
1,958.53
0.045
$4.00
Low Density Residential
Residential
634806299502000
3,014.96
0.069
$5.00
Low Density Residential
Residential
634806370791000
3,589.13
0.082
$5.00
Low Density Residential
Residential
634806371914000
3,470.10
0.080
$5.00
Low Density Residential
Residential
634806373303000
-3,477.83
0.0801
$5.00
Low Density Residential
Residential
634806373396000
4,077.65
0.0941
$5.00
Low Density Residential
Residential
634806373736000
3,956.83
0.0911
$5.00
Low Density, Residential
Residential
634806373856000
3,472.80
0.0801
$5.00
Low Density Residential
Residential
634806374780000
3,396.07
0.0781
$5.00
Low Density Residential
Residential
634806375821000
3,589.48
0.082
$5.00
Low Density Residential
Residential
634806380194000
4,584.25
0.105
$5.00
Low Density Residential
Residential
634806380923000
2,433.86
0.056
$5.00
Low Density Residential
Residential
634806381649000
2,133.09
0.049
$4.00
Low Density Residential
Residential
634806383654000
3,466.78
0.080
$5.00
Low Density Residential
Residential
634806384003000
3,627.43
0.083
$5.00
Low Density Residential
Residential
634806384264000
4,382.02
0.101
$5.00
Low Density Residential
Residential
634806385978000
3,772.63
0.087
$5.00
Low Density Residential
Residential
634806386018000
3,453.27
0.079
$5.00
Low Density Residential
Residential
634806386133000
3,623.87
0.083
$5.00
Low Density Residential
Residential
634806391119000
1,503.34
0.035
$3.00
Low Density Residential
Residential
634809050389000
3,618.901
0.0831
$5.00
Low Density Residential
Residential
Page 16 of 31

Town of Newport
Stormwater Management Program
Utilitv Fee Structure
Tax ID #
AREA(Sq. Ft.)
ACRES
Storm Water
Rate
Existing Land Use
Storm Water
Classification
634809050669000
2,548.13
0.058
$5.00
Low Density Residential
Residential
634809050870000
2,726.83
0.063
$5.00
Low Density Residential
Residential
634809051221000
8,144.94
0.187
$5.00
Low Density Residential
Residential
634809051467000
3,279.81
0.075
$5.00
Low Density Residential
Residential
634809052132000
2,673.78
0.061
$5.00
Low Density Residential
Residential
634809052533000
3,388.44
0.078
$5.00
Low Density Residential
Residential,
634809053204000
2,296.28
' 0.053
$4.00
Low Density Residential
Residential
634809053371000
3,236.29
0.074
$5.00
Low Density Residential
Residential
634809053620000
3,305.52
0.076
$5.00
Low Density Residential
Residential
634809053809000
2,801.28
0.064
$5.00
Low Density Residential
Residential
634809054347000
118.24
0.003
$3.00
Low Density Residential
Residential
634809054497000
5,128.68
0.118
$5.00
Low Density,Residential
Residential
634809055057000
3,688.96
0.085
$5.00
Low Density Residential
Residential
634809055752000
3,557.93
0.082
$5.00
Low Density Residential
Residential
634809055883000
2,225.21
0.051
$4.00
Low Density Residential
Residential
634809055975000
2,614.59
0.060
$5.00
Low Density Residential
Residential
634809056175000
4,141.05
0.095
$5.00
Low Density Residential
Residential
634809057226000
5,246.01
0.120
. $5.00
Low Density Residential
Residential
634809058508000
3,324.55
0.076
$5.00
Low Density Residential
Residential
634809058628000
6,401.25
0.147
$5.00
Low Density Residential
Residential
634809058748000
3,801.65
0.087
$5.00
Low Density Residential
Residential
634809058971000
5,705.60
0.131
$5.00
Low Density Residential
Residential
634809060160000
4,025.15
0.092
$5.00
Low Density Residential
Residential
634809060969000
5,371.60
0.123
$5.00
Low Density Residential
Residential
634809061137000
4,422.86
0.102
$5.00
Low Density Residential
Residential
634809062718000
6,397.55
0.147
$5.00
Low Density Residential
Residential
634809063323000
4,235.69
0.097
$5.00
Low Density Residential
Residential
634809063697000
6,477.55
, 0.149
$5.00
Low Density Residential
Residential
634809064936000
6,635.14
0.152
$5.00
Low Density Residential
Residential
634809065612000
3,814.51
0.088
$5.00
Low Density Residential
Residential
634809066349000
4,289.20
0.098
$5.00
Low Density Residential
Residential
634809066500000
4,290.27
0.098
$5.00
Low Density Residential
Residential
634809067216000
5,835.79
0.134
$5.00
Low Density Residential
Residential
634809068101000
3,202.71
0.074
$5.00
Low Density Residential
Residential
634809071113000
5,409.49
0.124
$5.00
Low Density Residential
Residential
634809072475000
3,262.40
0.075
$5.00
Low Density Residential
Residential
634809073184000
4,989.62
0.115
$5.00
Low Density Residential
Residential
634809074214000
3,800.44
0.087
$5.00
Low Density Residential
Residential
634809078461000
6,473.97
0.149
$5.00
Low Density Residential
Residential
634809161188000
25,353.27
0.582
$5.00
Low Density Residential
Residential
634809163730000
6,106.24
0.140
$5.00
Low Density Residential IResidential
634809163895000
3,747.761
0.086
$5.00
Low Density Residential IResidential
Page 17 of 31

Town of Newport
Stormwater Management Program
Utilitv Fee Structure
Tax ID M
AREA(Sq. Ft.)
ACRES
Storm Water
Rate
Existing Land Use -
Storm Water
Classification
634809164740000
4,771.66
0.110
$5.00
Low Density. Residential
Residential
63480916587000Q
3,546.51
0.081
$5.00
Low Density. Residential
Residential
634809168885000
2,211.46
0.051
$4.00
Low Density Residential
Residential
634809168982000
3,311.19
0.076
$5.00
Low Density Residential
Residential
634809171491000
7,484.81
0.172'
$5.00
Low Density Residential
Residential
634809173482000
5,147.94
0.118
'$5.00
Low Density Residential
Residential
634809174493000
3,443.12
0.079
$5.00
Low Density Residential
Residential
634809175043000
6,381.27
- 0.146
$5.00
Low Density Residential
Residential
634809175493000
6,043.77
0.139
$5.00
Low Density Residential
Residential
634809178057000
9,366.95
0.215
$5.00
Low Density Residential
Residential
634809178060000
4,976.69
0.114
$5.00
Low Density Residential
Residential
634809178404000
4,876.11
0.112
$5.00
Low Density Residential
Residential
634809252293000
259.57
0.006
$3.00
Low Density Residential
Residential
634809260758000
4152337
0.104
$5.60
Low Density Residential
Residential
634809261608000
1,092.39
0.025
$3.00
Low Density Residential
Residential
634809261931000
11,985.56
0.275
$5.00
Low Density Residential
Residential
634809271084000
5,077.88
0.117
$5.00
Low Density Residential
Residential
634809271161000
4,517.48
0.104
$5.00
Low Density Residential
Residential
634809271261000
5,440.52
0.125
$5.00
Low Density Residential
Residential
634809271367000
7,383.77
0.170
$5.00
Low Density' Residential
Residential
634810258555000
3,368.54
0.077
$5.00
Low Density Residential
Residential
634810258767000
2,545.67
0.058
$5.00
Low Density Residential
Residential
634810259558000
7,025.01
0.161
$5.00
Low Density Residential
Residential
634810259903000
3,881.44
0.089
$5.00
Low Density Residential
Residential
634810267132000
3,763.62
0.086
$5.00
Low Density Residential
Residential
634810267220000
2,998.09
0.069
$5.00
Low Density Residential
Residential
634810267229000
3,769.35
0.087
$5.00
Low Density Residential
Residential
634810267491000
3,751.10
0.086
-$5.00
Low Density Residential
Residential
634810267670000
2,991.88
0.069
$5.00
Low Density Residential
Residential
634810268651000
3,412.33
0.078
$5.00
Low Density Residential
Residential
634810268926000
3,110.67
0.071
$5.00
Low Density Residential
Residential
634810269136000
5,550.86
0.127
$5.00
Low Density Residential
Residential
634810270449000
4,343.75
0.100
$5.00
Low Density Residential
Residential
634810271486000
3,369.08
0.077
$5.00
Low Density Residential
Residential
634810274419000
3;976.24
0.091
$5.00
Low Density Residential
Residential
634810275331000
3,410.21
0.078
$5.00
Low Density Residential
Residential
634810276016000
3,884.00
0.089
$5.00
Low Density Residential
Residential
634810276321000
4,294.34
0.099
$5.00
Low Density Residential
Residential
634810278055000
4,452.28
0.102
$5.00
Low Density Residential
Residential
634810279314000
6,304.091
0.1451
$5.00
Low Density Residential
Residential
634810350717000
5,371.831
0.1231
$5.00
Low Density Residential
Residential
634810350950000
3,146.141
0.0721
$5.00
Low Density Residential lResidential
Page 18 of 31

Town of Newport
Stormwater Management Program
I Itilitv'Fae StninhirP
Tax ID #
AREA(Sq. Ft.)
ACRES
Storm Water
Rate
Existing Land Use
Storm Water
Classification
634810352674000
3,789.14
0.087
$5.00
Low Density Residential
Residential
634810360798000
1,648.11
0.038
$4.00
Low Density Residential
Residential
634810360800000
5,370:13
0.123
$5.00
Low Density Residential
Residential
634810362714000
2,926.22
0.067
$5.00
Low Density Residential
Residential
634810362846000
4,802.73
0.110
$5.00
Low Density Residential
Residential
634810363311000
3,506.12
0.080
$5.00
Low Density Residential
Residential
634810364458000
9,233.44
0.212
$5.00
Low Density Residential
Residential
634810368797000
9,648.83
0.222
$5.00
Low Density Residential
Residential
634810368950000
4,411.91
0.101
$5.00
Low Density Residential
Residential
634810370082000
3,825.16
0.088
$5.00
Low Density Residential
Residential
634810370428000
3,559.77
0.082
$5.00
Low Density Residential
Residential
634810371112000
3,724.53
0.086
$5.00
Low Density Residential
Residential
634810372096000
4,883.99
0.112
$5.00
Low Density Residential
Residential
634810373262000
-3,860.47
0.089
-$5.00
Low Density Residential
Residential
634810378074000
9,436.84
0.217
$5.00
Low Density Residential
Residential
634810378188000
6,533.97
0.150
$5.00
Low Density Residential
Residential
634813040748000
3,220.77
0.074
$5.00
Low Density Residential
Residential
634813041904000
6,124.43
0.141
$5.00
Low Density Residential
Residential
634813137031000
5,577.93
0.128
$5.00
Low Density Residential
Residential
634813144640000
78.11
0.002
$0.00
Low Density Residential
Residential
634813144645000
2,148.67
0.049
$4.00
Low Density Residential
Residential
634813144699000
328.28
0.008
$3.00
Low Density Residential
Residential
634813145058000
7,643.68
0.1751
$5.00
Low Density Residential
Residential
634813145648000
105.65
0.002
$0.00
Low Density Residential
Residential
634813149604000
1,563.38
0.036
$4.00
Low Density Residential
Residential
634813220921000
1,587.00
0.036
$4.00
Low Density Residential
Residential
634813221996000
752.58
0.017
$3.00
Low Density Residential
Residential
634813223975000
2,245.23
0.052
$4.00
Low Density Residential
Residential
634813230052000
4,659.45
0.107
$5.00
Low Density Residential
Residential
634813230255000
2,902.96
0.0671
$5.00
Low Density Residential
Residential
634813230461000
1,240.52
0.028
$3.00
Low Density Residential
Residential
634813232310000
1,608.17
0.037
$4.00
Low Density Residential
Residential
634813232410000
4,020.59
0.092
$5.00
Low Density Residential
Residential
634813233488000
9,194.02
0.211
$5.00
Low Density Residential
Residential
634813233620000
2,571.13
0.059
$5.00
Low Density Residential
Residential
634813233747000
4,512.91
0.104
$5.00
Low Density Residential
Residential
634813234200000
2,342.17
0.0541
$5.00
Low Density Residential
Residential
634813234219000
854.90
0.020
$3.00
Low Density Residential
Residential
634813240023000
3,311.85
0.076
$5.00
Low Density.Residential
Residential
634813240851000
1,036.94
0.024
$0.00
Low Density Residential
Residential
634813243089000
6,395.76
0.147
$5.001
Low Density Residential
lResidential
634813244030000
1,665.56
0.038
$4.001
Low Density Residential
lResidential
Page 19 of 31

Town of Newport
Stormwater Management Program
Utility Fee Structure
Tax ID N
AREA(Sq. Ft.)
ACRES
Storm Water
Rate
Existing Land Use
Storm Water
Classification-
634814225839000
4,193.04
0.096
$5.00
Low Density Residential
Residential
634814228890000
24.13
0.001
$0.00
Low Density Residential
Residential
634814235053000
9,932.68
0.226
$5.00
Low Density Residential
Residential
634814235254000
2,609.23
0.060
$5.00
Low Density Residential
Residential
634814235581000
790.08
0.018
$3.00
Low Density Residential
Residential
634814235947000
3,082.81
0.071
$5.00
Low Density Residential
Residential
634814238500000
978.44
0.022
$3.00
Low Density Residential
Residential
634814239146000
970.76
0.022
$3.00
Low Density Residential
Residential
634814239204000
1,789.26
0.041
$4.00
Low Density Residential
Residential
634814239878000
2,667.09
0.061
$5.00
Low Density Residential
Residential
634814239891000
3,457.47
0.079
$5.00
Low Density Residential
Residential
634814239924000
2,725.03
0.063
$5.00
Low Density Residential
Residential
634814248633000
3,114.01
0.071
$5.00
Low Density Residential
Residential
634814249004000
37,495.60
0.861
$5.00
Low Density Residential
Residential
634814321844000
3,525.14
0.081
$5.00
Low Density Residential
Residential
634814324966000
9,168.39
0.210
$5.00
Low Density Residential
Residential
634814327723000
4,059.26
0.0931
$5.00
Low Density Residential
Residential
634814330086000
-6,511.48
0.149
$5.60
Low Density Residential
Residential
634814330695000
2,866.20
0.066
$5.00
Low Density Residential
Residential
634814330753000
2,336.62
0.054
$5.00
Low Density Residential
Residential
634814332785000
13,360.92
0.307
$5.00
Low Density Residential
Residential
634814332837000
18,165.22
0.417
$5.00
Low Density Residential
Residential
634814333243000
3,313.89
0.076
$5.00
Low Density Residential '
Residential
634814334394000
2,432.14
0.056
$5.00
Low Density Residential
Residential
634814335255000
4,816.83
0.111
$5.00
Low Density Residential
Residential
634814336576000
2,507.39
0.058
$5.00
Low Density Residential
Residential
634814336783000
4,246.73
0.097
$5.00
Low Density Residential
Residential
634814336900000
4,409.55
0.101
$5.00
Low Density Residential
Residential
634814337383000
3,448.44
0:079
$5.00
Low Density Residential
Residential
634814337432000
4,734.57
0:109
. $5.00
Low Density Residential
Residential
634814337599000
2,473.94
0:057
$5.00
Low Density Residential
Residential
634814337607000
2,355.68
0.054
, $5.00
Low Density Residential
Residential
634814337855000
2,593.28
0.060
$5.00
Low Density Residential
Residential
634814338167000
2,972.19
0.068
$5.00
Low Density Residential
Residential
634814338226000
2,430.78
0.056
$5,00
Low Density Residential
Residential
634814338761000
1,767.69
0.041
$4.00
Low Density Residential
Residential
634814339024000
4,920.41
0.113
$5.00
Low Density Residential
Residential
634814339473000
1,863.08
0.043
$4.00
Low Density Residential
Residential
634814339698000
2,509.15
0.058
$5.00
Low Density Residential
Residential
634814339985000
2,374.98
0.055
$5:00
Low Density Residential
Residential
634814341060000
2,853.30
0.066
$5.001
Low Density Residential
Residential
6348143439580001
1,967.96
0.045
$4.001
Low Density Residential lResidential
Page 20 of 31

Town of Newport
Stormwater Management Program
Utility Fee Structure
Tax ID #
AREA(Sq. Ft.)
ACRES
Storm Water
Rate
Existing Land Use
Storm Water
Classiflcation
634814346103000
4,592.19
0.105
$5.00
Low Density Residential
Residential
634814348132000
4,191.77
0.096
$5.00
Low Density Residential
Residential
634814420992000
6,372.45
0.146
$5.00
Low Density Residential
Residential
63481442269.7000
3,340.36
0:077
$5.00
Low Density Residential
Residential
634814423823000
2,431.98
0.056
$5.00
Low Density Residential
Residential
634814424624000
5,386.45
0.124
$5.00
Low Density Residential
Residential
634814424929000
2,327.94
0.053
$5.00
Low Density Residential
Residential
634814427749000
51027.95
0.115
$5.00
Low Density Residential
Residential
634814430357000
2,426.45
0.056
$5.00
Low Density Residential'
Residential
634814430976000
2,544.69
0.058
$5.00
Low Density Residential
Residential
634814431124000
2,140.70
0.049
$4.00
Low Density Residential
Residential
634814431209000
616.86
0.014
$3.00
Low Density Residential
Residential
634814431589000
3,258.41
0.075
$5.00
Low Density Residential
Residential
634814432350000
2,312.34
0.053
$4.00
Low Density Residential
Residential -:
634814433454000
197.13
0.005
$3.00
Low Density Residential
Residential
634814434444000
6,984.70
0.160
$5.00
Low Density Residential
Residential
634814434701000
1,323.66
0.030
$3.00
Low Density Residential
Residential
634814436738000
31393.94
0.078
$5.00
Low Density Residential
Residential
634814442021000
3,059.48
0.070
$5.00
Low Density Residential
Residential
634814443004000
3,040.71
0.070
$5.00
Low Density Residential
Residential
634814443086000
2,658.44
0.061
$5.00
Low Density Residential
Residential
634814444087000
4,813.70
0.111
$5.00
Low Density Residential
Residential
634814469153000
2,929.38
0.067
$5.00
Low Density Residential
Residential
634815522515000'
5,152.92
0.118
$5.00
Low Density Residential
Residential
634815524604000
7,735.31
0.178
$5.00
Low Density Residential
Residential
634815531126000
2,429.84
0.056
$5.00
Low Density Residential
Residential
634815730140000
331,969.24
7.621
$5.00
Low Density Residential
Residential,
634818205795000
6,703.99
0.154
$5.00
Low Density Residential
Residential
638808886409000
2,232.96
0.051
$44.00
Low Density Residential
Residential
1,796.20
0.041
$0.00
Low Density Residential
Residential
632701148809000
3,488.74
0.080
$5.00
Low Density Residential
Residential.
633808887698000
2,210.92
0.051
$4.00
Medium Density Residential
Residential
633808887753000
2,532.31
0.058
$5.00
Medium Density Residential
Residential
633808888564000
3,338.29
0.077
$5.00
Medium Density Residential
Residential
633808888631000
1,944.36
0.045
$4.00
Medium Density Residential
Residential
633808889393000
2,935.21
0.067
$5.00
Medium Density Residential
Residential
633808889431000
2,774.52
0;064
$5.00
Medium Density Residential
Residential
633808889698000
2,812.76
0.065
$5.00
Medium Density Residential
Residential
633808889744000
1,705.64
0.039
$4.00
Medium Density Residential
Residential
633808889810000'
2,200.36
0.051
$4.00
Medium Density Residential
Residential
633808980134000
1,928.611
0.0441
$4.001
Medium Density Residential
Residential
633808980169000
1,667.891
0.0381
$4.001
Medium Density Residential
Residential
Page 21 of 31

Town of Newport
Stormwater Management Program
Utility Fee Structure
Tax ID #
AREA(Sq. Ft.)
ACRES
Storm Water
Rate
Existing Land Use
Storm Water
Classification
633808980358000
2,472.39
0.057
$5.00
Medium Density Residential
Residential
633808980517000
2,247.67
0.052
$4.00
Medium Density Residential
Residential
633808980671000
2,755:47
0.063
$5.00
Medium Density Residential .
Residential
633808980785000
5,754.69
0.132
$5.00
Medium Density Residential
Residential
633808980832000,
2,188.86
0.050
$4.00
Medium Density Residential
Residential
633808980930QQO
2,060.17
0.047
$4.00
Medium Density Residential
Residential
633808981413000
2,601.55
0.060
$5.00
Medium Density Residential
Residential
633808981624000
2,176.26
0.050
$4.00
Medium Density Residential
Residential
633808981850000
2,194.41
0.050
$4.00
Medium Density Residential
Residential
633808982520000
2,638.55
0.061
$5.00
Medium Density Residential
Residential
633808982594000
2,874.66
0.066
$5.00
Medium Density Residential
Residential
633808982731000
2,762.42
0.063
$5:00
Medium Density Residential
Residential
633808982795000
3,026.48
0.069
$5.00
Medium Density Residential .
Residential
633808982805000
2,425.86
0.056
" $5.00
Medium Density Residential
Residential
633808982940000
7,289.83
0.167
$5.00
Medium Density Residential
Residential
633808983548000
2,686.74
0.062
$5.00
Medium Density Residential
Residential
633808983748000
2,718.98
0.062
$5.001
Medium Density Residential
Residential
633808983904000
2,118.31
0.049
$4.00
Medium Density Residential
Residential
633808984600000
2,350.30
0.054
$5.00
Medium Density Residential
Residential
633808984654000
2,308.02
0.053
$4.00
Medium Density Residential
Residential
633808984802000
2,300.68
0.053
$4.00
Medium Density Residential
Residential
633808984849000
2,240.04
0.051
$4.00
Medium Density Residential
Residential
633808984906000
2,268.36
0.052
$4.00
Medium Density Residential
Residential
633808985618000
2,545.48
0.058
$5.00
Medium Density Residential
Residential
633808985751000
2,174.56
0.050
$4.00
Medium Density Residential
Residential
633808986735000
2,212.72
0.051
$4.00
Medium Density Residential
Residential
633808986869000
2,415.33
0.055
$5.00
Medium Density Residential
Residential
633808986890000
2,263.95
0.052
$4.00
Medium Density Residential
Residential
633808990090000
2,171.51
0.050
$4.00
Medium Density Residential
Residential
633808990406000
2,070.22
0.048
$4.00
Medium Density Residential
Residential
633808990532000
2,047.72
0.047
$4.00
Medium Density Residential
Residential
633808990568000
1,961.47
0.045
$4.00
Medium Density Residential
Residential
633808990694000
2,027.93
0.047
. $4.00
Medium Density Residential
Residential
633808991056000
1,945.79
M045
$4.00
Medium Density Residential
Residential
633808991451000
1,649.71
0.038
$4.00
Medium Density Residential
Residential
633808991766000
1,819.75
0.042
$4.00
Medium Density Residential.
Residential
633808992100000
1,924.11
0:044
$4.00
Medium Density Residential
Residential
633808992179000
1,818.06
0.042
$4.00
Medium Density Residential
Residential
633808992234000
2,078.80
0.048
$4.00
Medium Density Residential
Residential
633808992311000
'1,985.02
0.046
$4.00
Medium Density Residential
Residential
633808992523000
1,469.08
0.034
$3.00
Medium Density Residential IResidential
633808992578000
2,028.20
0.047
$4.00
Medium Density Residential lResidential
Page 22 of 31

Town of Newport
Stormwater Management Program
Utilitv Fee Structure
Tax ID #k
AREA(Sq. Ft.)
ACRES
Storm Water
Rate
Existing Land Use
Storm Water
Classification
633808993073000
2,189.38
0.050
$4.00
Medium Density Residential
Residential
633808993103000
2,294.32
0.053
$4.00
Medium Density Residential
Residential
633808993407000
2,075.58
0.048
$4.00
Medium Density Residential
Residential
633808993441000
1,519.33
0.035
$4.00
Medium Density Residential
Residential
633808993977000
2,868.44
0.066
$5.00
Medium Density Residential
Residential
633808994178000
1,635.78
0.038
$4.00
Medium Density Residential
Residential
633808995047000
2,036.71
0.047
$4.00
Medium Density Residential
Residential
633808995082000
2,397.50
0.055
$5.00
Medium Density Residential
Residential
633808999113000
2,042.91
0.047
$4.00
Medium Density Residential
Residential
633808995663000
2,595.46
0.060
$5.00
Medium Density Residential
Residential
633808995742000
3,013.91
0.069
$5.00
Medium Density Residential
Residential
633808995806000
1,728.90
0.040
$4.00
Medium Density Residential
Residential
633808995910000
3,182.54
0.073
$5.00
Medium Density Residential
Residential
633808996547000
2,921.85
0.067
$5.00
Medium Density Residential _ _
Residential.
633808996708000
3;097.86
0.071
$5.00
Medium Density Residential
Residential
633808996861000
1,928.49
0.044
$4.00
Medium Density Residential
Residential
633808997318000
2,698.88
0.062
$5.00
Medium Density Residential
Residential
633808997361000
2,274.27
0.052
$4.00
Medium Density Residential
Residential
633808997406000
2,123.76
0.049
$4.00
Medium Density Residential
Residential
633808997562000
2,965.69
0.068
$5.00
Medium Density Residential
Residential
633808997611000
2,174.76
0.050
$4.00
Medium Density Residential
Residential
633808997677000
2,267.16
0.052
$4.00
Medium Density Residential
Residential
633808997824000
2,614.44
0.060
$5.00
Medium Density Residential
Residential
633808998154000
2,755.17
0.063
$5.00
Medium Density Residential
Residential
633808998261000
2,441.11
0.056
$5.00
Medium Density Residential
Residential
633808998343000
2,312.67
0.053
$4.00
Medium Density Residential
Residential
633808998588000
2,368.38
0.054
$5.00
Medium Density Residential
Residential
633808998721000
3,005.55
0.069
$5.00
Medium Density Residential
Residential
633808998775000
2,943.86
0.068
$5.00
Medium Density Residential
Residential
633808998923000
3,333.30
0.077
$5.00
Medium Density Residential
Residential
633808999032000
2,090.17
0.048
$4.00
Medium Density Residential
Residential
633808999278000
2,404.33
0.055
$5.00
Medium Density Residential
Residential
633808999308000
2,309.68
0.053
$4.00
Medium Density Residential
Residential
633808999453000
3,277.50
0.075
$5.00
Medium Density Residential
Residential
633808999679000
2,503.27
0.057
$5.00
Medium Density Residential.
Residential
633808999830000
2,186.17
0.050
$4.00
Medium Density Residential
Residential
633811763384000
5,277.40
0.121
$5.00
Medium Density Residential
Residential
633812757830000
2,026.34
0.047
$4.00
Medium Density Residential
Residential
633812757837000
3,876.66
0.089
$5.00
Medium Density Residential
Residential
633812850977000
3,200.48
0.073
$5.00
Medium Density Residential
Residential
16338128586270001
2,198.281
OM01
$4.00
Medium Density Residential
Residential
633812859626000
1,364.471
0,0311
$3.001
Medium Density Residential
Residential
Page 23 of 31

Town of Newport
Stormwater Management -Program
Utility Fee Structure
Tax ID # -
AREA(Sq. Ft.)
ACRES
Storm Water
Rate
Existing Land Use ,
Storm Water
Classification
633812862805000
4,706.93
0.108
$5.00
Medium Density Residential
Residential
633812863128000
2,089.67
0.048
$4.00
Medium Density Residential
Residential
633812865359000
3,734.28
0.086
$5.00
Medium Density Residential
Residential
633812877267000
2,244.74
0.052
$4.00
Medium Density Residential
Residential
633812950898000
2,552.75
0.059
$5.00
Medium Density Residential
Residential
633812965244000
3,364.21
0.077
$5.00
Medium Density Residential
Residential
633812966310000
2,022.16
0.046
$4.00
Medium Density Residential
Residential
633812966375000
2,426.03
0.056
$5.00
Medium Density Residential
Residential
633812967430000
1,663.99
0.038
-$4.00
Medium Density Residential
Residential
633812969406000
2,535.02
0.058
$5.00
Medium Density Residential
Residential
633816941407000
2,750.25
0.0631
$5.00
Medium Density Residential
Residential
634805080858000
2,303.70
0.053
$4.00
Medium Density Residential
Residential
634805081589000
2,152.50
0.049
$4.00
Medium Density Residential
Residential
634805081713000
2,979.64
0.068
$5.00
Medium Density Residential
Residential
634805081793000
2,3901.79
0.055
$5:00
Medium DensityResidential
Residential
634805082495000
3,207.39
0.074
$5:00
Medium Density Residential
Residential
634805082530000
2,485.74
0.057
$5.00
Medium Density Residential
Residential
634805082883000
2,326.97
0.0531
$5.00
Medium Density Residential
Residential
634805083397000
3,242.23
0.074
$5.00
Medium Density Residential
Residential
634805083469000
1,629.22
0.037
$4.00
Medium Density Residential
Residential
634805083608000
2,222.92
0.051
$4.00
Medium Density Residential
Residential
634805083763000
2,382.87
0.055
$5.00
Medium Density Residential
Residential
634805083869000
2,220.47
0.051
$4.00
Medium Density Residential
Residential
634805084482000
3,017.50
0.069
$5.00
Medium Density Residential
Residential
634805084568000
5,015.72
0.115
$5.00
Medium Density Residential
Residential
634805084716000
2,137.40
0.049
$4.00
Medium Density Residential
Residential
634805084871000
2,839.16
0.065
$5.00
Medium Density Residential
Residential
634805085469000
2,942.22
0.068
$5.00
Medium Density Residential
Residential
634805085622000
2,152.60
0.049
$4.00
Medium Density Residential
Residential
634805085667000
1,997.23
0.046
$4.00
Medium Density Residential
Residential
634805085957000
3,044.34
0.070
$5.00
Medium Density Residential
Residential
634805085980000
2,313:58
0.053
$4.00
Medium Density Residential
Residential
634805086217000
3,743.50
0.086,
$5.00
Medium Density Residential
Residential
634805086383000
3,625.08
0.083
$5.00
Medium Density Residential
Residential
634805086544000
3,270.03
0:075
$5.00
Medium Density Residential
Residential
634805086731000
3,882.11
0.089
$5.00
Medium Density Residential
Residential
634805086856000
3,062.90
0.070
$5.00
Medium Density Residential
Residential
634805087369000
3,300.92
0.076
- $5.00
Medium Density Residential
Residential.
634805087836000
2,309.05
0.053
$4.00
Medium Density Residential
Residential
634805087972000
2,651.68
0.061
. $5.00
Medium Density Residential
Residential
63480508798900.0
2,727.79
0.063
$5.00
Medium Density Residential
Residential
634805089587000
1,852.68
0.043
$4.00
Medium Density Residential
Residential
Page 24 of 31

Town of Newport
Stormwater Management Program
Utilitv Fee Structure
Tax ID q
AREA(Sq. Ft.)
ACRES
Storm Water
Rate
Existing Land Use
Storm Water
Classification'
634805090167000
2,770.97
' 0.064
$5.00
Medium Density Residential
Residential
634805090190000
2,302.79
0.053
$4.00
Medium Density Residential
Residential
634805090396000
2;853.80
0.066
.$5.00
Medium Density Residential
Residential
634805090416000
3,158.33
0.073
$5.00
Medium Density Residential
Residential
634805090561000
2,080.16
0.048
$4.00
Medium Density Residential
Residential
634805090786000
2,924.76
0.067
$5.00
Medium Density Residential
Residential
634805090838000
3,750.91
0.086
$5.00
Medium Density Residential
Residential
634805090983000
2,422.88
0.056
$5.00
Medium Density Residential
Residential
634805091067000
1,995.50
0.046
$4.00
Medium Density Residential
Residential
634805091070000
3,212.00
0.074
$5.00
Medium Density Residential
Residential
634805091179000
3,804.08
0.0871
$5.00
Medium Density Residential
Residential
634805091661000
3,397.53
0.0781
$5.00
Medium Density Residential
Residential
634805091841000
2,852.22
0.0651
$5.00
Medium Density Residential
Residential .
634805091895000
2,454.18
0.0561
$5.00
Medium Density Residential
Residential
634805091936000
2,774.47
0.0641
$5.00
Medium Density Residential
Residential
634805092355000
2,423.53
0.0561
$5.00
Medium Density Residential
Residential
634805092421000
2;165.28
0.0501
$4.00
Medium Density Residential
Residential
634805092511000
2,490.44
0.0571
$5.00
Medium Density Residential
Residential
634805092586000
2,372.29
0.0541.
$0.00
Medium Density Residential
Residential
634805092615000
21031.49
0.0471
$4.00
Medium Density Residential
Residential
634805092669000
2,572.63
0.0591
$5.00
Medium Density Residential
Residential
634805092995000
2,667.75
0.0611
$5.00
Medium Density Residential
Residential
634805093209000
2,856.15
0.6661
$5.00
Medium Density Residential
Residential
634805098244000
2,810.24
0.0651
$5.00
Medium Density Residential
Residential
634805093566000
2,715.45
0.062
$5.00
Medium Density Residential
Residential
634805093713000
2,450.95
0,056
$5.00
Medium Density Residential
Residential
634805093777000
2,398.80
0.055
$5.00
Medium Density Residential
Residential
634805093956000
2,830.99
0.065
$5.00
Medium Density Residential
Residential
634805094119000
2,169.44
0.050
$4.00
Medium Density Residential
Residential
634805094636000
2,171.00
0.050
$4.00
Medium Density Residential
Residential
634805094792000
2,485.34
0.057
$5.00
Medium Density Residential
Residential
634805094830000
2,295.47
0.053
$4.00
Medium Density Residential
Residential
634805094888000
3,399'.01
0.078
$5.00
Medium Density Residential
Residential
634805094935000
3,470.51
' 0.080
$5.00
Medium Density Residential
Residential
634805095033000
2,355.74
0.054
$5.00
Medium Density Residential
Residential
634805095311000
2,677.34
0.061
$5.00
Medium Density Residential
Residential
634805095467000
1,934.41
0.044
$4.00
Medium Density Residential
Residential
634805095522000
2,328.83
0.053
$5.00
Medium Density Residential
Residential
634805095777000
2,003.711,0.0461
$4.00
Medium Density Residential
Residential
634805096147000
2,857:92
0.066
$5.00
Medium Density Residential
Residential
634805096181000
2,508.631
0.0581
$5.001
Medium Density Residential
Residential
634805096383000
2,110.341
0,0481
$4.001
Medium Density Residential
IResidential
Page 25 of 31

Town of Newport
Stormwater Management Program
Utility Fee Structure
Tax ID #
AREA(Sq. Ft.)
ACRES
Storm Water
Rate
Existing Land Use
Storm Water
Classification
634805096411000
2,382.47
0.055
$5.00
Medium Density Residential
Residential
634805096653000
2,477.53
'0.057.
$5.00
Medium Density Residential
Residential
634805096740000
2,452.07
0.656
$5.00
Medium Density Residential
Residential
634805097167000
3,976.85
0.091
$5.00
Medium Density Residential
Residential
634805097225000
2,444.05
0.056
$5.00
Medium Density Residential
Residential
634805097508000
2;528.34
' 0.058
$5.00
Medium Density Residential
Residential
634805097552000
2,584.56
0.059
$5.00
Medium Density Residential
Residential
634805098123000
3,210.78
0.074
$5.00
Medium Density Residential
Residential
634805098367000
2,126.32
0.049
$4.00
Medium Density Residential
Residential
634805098422000
2,651.01
0.061
$5.00
Medium Density Residential
Residential
634805099107000
2,254.76
0.052
$4.00
Medium Density Residential
Residential
634805099311000
2,931.19
0.067
$5.00
Medium Density Residential
Residential
634805181826000
8,140.25
0.187
$5.00
Medium Density Residential
Residential
634805271734000
1,792.02
0.041
$4.00
Medium Density Residential
Residential
634805273584000
1,537.97
0.035
$4.00
Medium Density Residential
Residential
634805283277000
3,041.72
0.070
$5.00
Medium Density Residential
Residential
634805284251000
2,711.88
0.062
$5.001
Medium Density Residential
Residential
634806276658000
3,411.84
0:078
$5.00
Medium Density Residential
Residential
634806278904000
3,793.15
0.087
$5.00
Medium Density Residential
Residential
634806285085000
3,082.09
0.071
$5.00
Medium Density Residential
Residential
634806285378000
2,922.80
0.067
$5.00
Medium Density Residential
Residential
634806285682000
3,610.44
0.083
$5.00
Medium Density Residential
Residential
634806285774000
2,974.58
0.068
$5.00
Medium Density Residential
Residential
634806286369000
2,750.34
0.063
$5.00
Medium Density Residential
Residential
634806286821000
2,175.23
0.050
$4.00
Medium Density Residential
Residential
634806287156000
4,090.85
0.094
$5.00
Medium Density Residential
Residential
634806287245000
4,369.51
0.100
$5.00
Medium Density Residential
Residential
634806287803000
3,523.15
0.081
$5.00
Medium Density Residential
Residential
634806288270000
3,324.87
0.076
$5.00
Medium Density Residential
Residential
634806288289000
3,720.42
0.085
$5.00
Medium Density Residential
Residential
634806288413000
2,777.30
0.064
$5.00
Medium Density Residential
Residential
634806289190000
4,767.27
0.109
$5.00
Medium Density Residential
Residential
634806289477000
2,983.20
0.068
$5.00
Medium Density Residential
Residential
634806297282000
2,976.20
0.068
$5.00
Medium Density Residential
Residential
634806380384000
3,667.54
0.084
$5.00
Medium Density Residential
Residential
634806380459000
2,648.16
0.061
$5.00
Medium Density Residential
Residential
634806381205000
3,731.09
0.086
$5.00
Medium Density Residential
Residential
634806381531000
2,787.42
0.064
$5.00
Medium Density Residential
Residential
634806382220000
3,825.47
0.088
$5.00
Medium Density Residential
Residential
634806382317000
3,56175
0.082
$5.00
Medium Density Residential
Residential
634806382357000
3,11314.55L
0.0721
$5.00
Medium Density Residential
lResidential
634806382514000
2,959.281
0.0681
$5.001
Medium Density Residential
lResidential
Page 26 of 31

Town of Newport
Stormwater Management Program
Utility Fee Structure
Tax ID #
AREA(Sq. Ft.)
ACRES
Storm Water
Rate
Existing Land Use
Storm Water
Classification
634806382857000
2,526.81
0.058
$5.00
Medium Density Residential
Residential
634806382890000
2,489.95
0.057
$5.00
Medium Density Residential
Residential
634806382913000
1,496.93
0.034
$3.00
Medium Density Residential
Residential
634806383584000
3,236.51
0.074
$5.00
Medium Density Residential
Residential
634806383733000
2,269.47
0.052
$4.00
Medium Density Residential
Residential
634806384343000
3,115.77
0.072
$5.00
Medium Density Residential
Residential
634806384418000
2,319.92
0.053
$4.00
Medium Density Residential
Residential
634806384434000
2,859.75
0.066
$5.00
Medium Density Residential
Residential
634806390257000
1,926.51
0.044
$4.00
Medium Density Residential
Residential
634806391080000
2,628.82
0.060
$5.00
Medium Density Residential
Residential
634806391150000
3,094.05
0.071
$5.001
Medium Density Residential
Residential
634806393297000
0.09
0.000
$0.00
Medium Density Residential
Residential
634809165642000
5,617.09
- 0.129
$5.00
Medium Density Residential
Residential
634809166622000
2,035.31
0.047
$4.00
Medium Density Residential -
Residential -
634809166694000
3,165.35
0.073
$5.00
Medium Density Residential
Residential
634809166703000
2,203.08
0.051
$4.00
Medium Density Residential
Residential
634809169666000
1,947.37
0.045
$4.00
Medium Density Residential
Residential
634809179495000
2,179.19
0.050
$4.00
Medium Density Residential
Residential
634809254354000
9,670.48
0.222
$5.00
Medium Density Residential
Residential
634809260636000
2,034.15
0.047
$4.00
Medium Density Residential
Residential
634809273394000
1,119.70
0.026
$3.00
Medium Density Residential
Residential
634809273485000
4,713.04
0.108
$5.00
Medium Density Residential
Residential
684809274204000
2,998.66
0.069
$5.00
Medium Density Residential
Residential
634810256181000
4,254.16
0.098
$5.00
Medium Density Residential
Residential
634810257828000
7,561.72
0.174
$5.00
Medium Density Residential
Residential
634810257936000
3,592.62
0.082
$5.00
Medium Density Residential
Residential
634810258146000
3,437.53
0.079
$5:00
Medium Density Residential
Residential
634810259142000
1,923.99
0.044
$4.00
Medium Density Residential
Residential
634810259374000
4,251.36
0.098
$5.00
Medium Density Residential
Residential
634810267034000
2,347.04
0.054
$5.00
Medium Density Residential
Residential
634810267515000
4,761.00
0.109
$5.00
Medium Density Residential
Residential
634810268520000
1,504.55
0.035
$3.00
Medium Density Residential
Residential
634810269026000
2,917.79
0.067
$5.00
Medium Density Residential
Residential
634810269255000
1,265.03
0.029
$3.00
Medium Density Residential
Residential
634810269364000
1,746.49
0.040
$4.00
Medium Density Residential
Residential
634810269483000
2,477.84
0.057
$5.00
Medium Density Residential
Residential
634810269592000
4,445.75'
'0.102
$5.00
Medium Density Residential
Residential
634810273408000
3,146.57
6.072
$5.00
Medium Density Residential
Residential
634810275130000
3,340.02
0.077
$5.00
Medium Density Residential
Residential
634810350541000
2,594.24
0.060
'$5.00
Medium Density Residential
Residential
634810350663000
2,952.371
0,0681
$5.00
Medium Density Residential
IResidential
634810351402000
1,504.191
0.0351
$3.001
Medium Density Residential
lResidential
Page 27 of 31

Town of Newport
Stormwater Management Program
Utilitv Fee Structure
Tax ID #
AREA(Sq. Ft.)
ACRES
Storm Water
Rate
Existing Land Use
Storm Water
Classification
634810352363000
3,262.22
0.075
$5.00
Medium Density Residential
Residential
634810352575000
2,993.96
0.069
$5.00
Medium Density Residential
Residential
634810353055000
2,628.39
0.060
$5.00
Medium Density Residential
Residential
634810353212000
3,036.33
0.070
$5.00
Medium Density Residential
Residential
634810353385000
2,170.56
0.050
$4.00
Medium Density Residential
Residential
634810360622600
4,269.33
0.098
$5.00
Medium Density Residential
Residential
634810360942000
1,416.44
0.033
$3.00
Medium Density Residential
Residential
634810361104000
1,452.13
0.033
$3.00
Medium Density Residential
Residential
634810361225000
. 4,11.9.31
0.095
$5.00
Medium Density Residential
Residential
634810361334000
2,914.67
0.067
$5.00
Medium Density Residential
Residential
634810361454000
3,218.16
0.074
$5.00
Medium Density Residential
Residential
634810372266000
3,326.31
0.076
$5.00
Medium Density Residential
Residential
634813143592000
961.91
6.022
$3.00
Medium Density Residential
Residential
634813145790000
1,735.54
0.040
$4.00
Medium Density Residential
Residential
634813146477000
1,713.55
0.039
$4.00
Medium Density Residential
Residential
634813146659000
2,247.96
0.0521
$4.00
Medium Density Residential
Residential
634813147436000
1,645.38
0.0381
$4.00
Medium Density Residential
Residential
634813147619000
2,660.07
0.0611
$5.00
Medium Density Residential
Residential
634813147687000
2,817.06
0.065
$5.00
Medium Density Residential
Residential
634813149805000
3,305.16
0.076
$5.00
Medium Density Residential
Residential
634813231290000
3,568.24
0.082
$5.00
Medium Density Residential
Residential
634813240683000
1,299.35
0.030
$3.00
Medium Density Residential
Residential
634813241328000
2,320.32
0.053
$4.00
Medium Density Residential
Residential
634813241683000
2,092.79
0.048
$4.00
Medium Density Residential -
Residential
634813242466000
1,601.92
0.037
$4.00
Medium Density Residential
Residential
634813243362000
3,884.73
0.089
$5.00
Medium Density Residential
Residential
634813243773000
, 2,616.15
0.060
$5.00
Medium Density Residential
Residential
634813243819000
2,638.62
0.061
$5.00
Medium Density Residential
Residential
634813243832000
1,273.68
0.029
$3.00
Medium Density Residential
Residential
634814235690000
1,687.68
0.039
$4.00
Medium Density Residential
Residential
634814237588000
5,323.43
0.122
$5.00
Medium Density Residential
Residential
634814237751000
10,273.81
0.236
$5.00
Medium Density Residential
Residential
634814245574000
1,382.22
0.032
$3.00
Medium Density. Residential
Residential
634814245579000
2,599.50
0.060
$5.00
Medium Density Residential
Residential
634814245590000
1,719.48
0.039
$4.00
Medium Density Residential
Residential -
634814247483000
6,152.16
0.141
$5.00
Medium Density Residential .'
Residential
634814247896000
2,596.41
0.0601
$5.00
Medium Density Residential
Residential
634814248116000
1,900.12
0.0441
$4.00
Medium Density Residential
Residential
634814248204000
2,490.17
0.0571
$5.00
Medium Density Residential
Residential
634814248716000
4,814.01
0.111
$5.00
Medium Density Residential
Residential
634814327944000
2,838.95
0.0651
$5.001
Medium Density Residential
Residential
634814331394000
1,511.27
0.0351
$3.00
Medium Density Residential lResidential
Page 28 of 31

. Town of Newport
Stormwater Management Program
I Ifilih, Fpo Rfn inturp
Tax ID #
AREA(Sq. Ft.)
ACRES
Storm Water
Rate
Existing Land Use
Storm Water
Classification
634814331984000
5,577.01
0.128
' $5.00
Medium Density Residential
Residential
634814332288000
3,178.37
0.073
$5.00
Medium Density Residential
Residential
634814333176000
2,376.13
0.055
$5.00
Medium Density Residential
Residential
634814333192000
2,507.38
0.058
.$5.00
Medium Density Residential
Residential
634814334027000
2,468.20
0.0571
$5.00
Medium Density Residential
Residential
634814335187000
2,014.88
0.0461
$4.00
Medium Density Residential
Residential
634814335773000
2,187.82
0.0501
$4.00
Medium Density Residential
Residential
634814336113000
4,458.38
0.102
$5.00
Medium Density Residential
Residential
634814340728000
1,310.26
0.030
$3.00
Medium Density Residential
Residential
634814341026000
1,739.58
0.040
$4.00
Medium Density Residential
Residential
634814341434000
4,746.59
0.109
$5.00
Medium Density Residential
Residential
634814341870000
5,119.88
0.118
$5.00
Medium Density Residential.
Residential
634814342279000
5,134.72
0.118
$5.00
Medium Density Residential
Residential
634814343154000
1,719.33
0.039
$4.00
Medium Density. Residential ._
Residential
634814344020000
1,699.03
0.039
$4.00
Medium Density Residential
Residential
634814429578000
2,092.27
0.048
$0.00
Medium Density Residential
Residential
634814431473000
2,611.91
'0.060
$5.00
Medium Density Residential
Residential
634814432484000
2,908.44
0.067
$5,00
Medium Density Residential
Residential
634814433142000
3,281.88
0.075
$5.00
Medium Density Residential
Residential
634814433341000
3,659.19
0.084
$5.00
Medium Density Residential
Residential
634814434132000
2,474.90
0.057'
$5.00
Medium Density Residential
Residential
634814434311000
2,665.83
0.061
$5.00
Medium Density Residential
Residential
634814434391000
3,750.89
- 0.086
$5.00
Medium Density Residential
Residential
634814435102000
3,135.09
0.072
$5.00
Medium Density Residential
Residential
634814435182000
2,394.88
'0.055
$5.00
Medium Density Residential
Residential
634814435361000
2,474.11
0.057
$5.00
Medium Density Residential
Residential
634814435465000
1,727.34
0.040
$4.00
Medium Density Residential
Residential
634814436153000
2,829.83
0.065
$5.00
Medium Density Residential
Residential
634814436341000
3,207.30
0.074
$5.00
Medium Density Residential
Residential
634814436474000
2;897.82
0.067
$5.00
Medium Density Residential
Residential
634814437133000
2,528.38
0.058
$5.00
Medium Density Residential -
Residential
634814437312000
3,376.91
0.078
$5.00
Medium Density Residential
Residential
634814437392000
3,018.71
0.069
$5.00
Medium Density Residential
Residential
634814437494000
2,416.78
0.055
$5.00
Medium Density Residential
Residential
634814438103000
2,563.35
0.059
$5.00
Medium Density Residential
Residential
634814438173000
2,547.74
0.058
$5.00
Medium Density Residential.
Residential
634814438362000
2,979.88
0.068
$5.00
Medium Density Residential
Residential
634814439352000
2,735.45
0.063
$5.00
Medium Density Residential
Residential
634814439404000
2,817.44
0.065
$5.00
Medium Density Residential .
Residential.
634814440291000
2,665.17
0.0611
$5.00
Medium Density Residential
Residential
634814441273000
3,484.74
0.0801
$5.00
Medium Density Residential
lResidential
634814443248000
3,539.08
0.0811
$5.00
Medium Density Residential
lResideritial
Page 29 of 31

Town of Newport
Stormwater Management Program
Utilitv Fee Structure
'Tax ID #
AREA(Sq. Ft.)
ACRES
Storm Water
Rate
Existing Land Use
Storm Water .
Classification
634815530133000
2,638.30
0.061
$5:00
Medium Density'Residential
Residential
634815530353000
2;498.23
0.057
$5:00
Medium Density Residential
Residential
634815530422000
2,961.14
0.068
$5.00
Medium Density Residential
Residential
634815531228000
3,194.22
0.073
$5.00
Medium Density Residential
Residential
634917000393000
3,501.86
0.080
$5.00
Medium Density Residential
Residential
634917001063000
2,216.89
0.051
$4.00
Medium Density Residential
Residential
634917001220000
3,032.80
0.070
$5.00
Medium Density Residential
Residential
634917001294000
3,067.71
0.070
$5.00
Medium Density Residential
Residential
634917001387000
3,152.06
0.072
$5.00
Medium Density Residential
Residential
634917001496000
2,123.33
0.049
$4.00
Medium Density Residential
Residential
634917001514000
2,281.69
0.052
$4.00
Medium Density Residential
Residential
634917002044000
2,572.38
0.059
$5.00
Medium Density Residential
Residential
634917002159000
2,722.16
0.062
$5.00
Medium Density Residential
Residential
634917003111000
2,475.12
0.057
$5.00
Medium -Density Residential
Residential
633911751229000
175.28
0.004
$15.00
Office and Institutional
Non -Residential
633819619040000
124,762.73
2.864
$125.00
Office and' Institutional
Non -Residential
633819701135000
36,420.43
0.836
$50.00
Office and Institutional
Non -Residential
634701196372000
25,246.14
0.580
$25.00
Office and Institutional
Non -Residential
634701285508000
244,927.36
5.623
$125.00
Office and Institutional
Non -Residential
634805270734000
5,485.40
0.126
$25.00
Office and Institutional
Non -Residential
634809068642000
36,791.79
0.845
$50.00
Office and, Institutional
Non -Residential
634809169244000
30,803.19
0.707
$25.00
Office and Institutional
Non -Residential
634809251667000
233,071.64
5.351
$125.00
Office and Institutional
Non -Residential
634809253274000
3,727.66
0.086
$25.00
Office and Institutional
Non -Residential
634810257725000
1,481.87
0.034
$15.00
Office and Institutional
Non -Residential
634810266892000
69,785.64
1.602
$60.00
Office and Institutional
Non -Residential
634810357563000
896.38
0.021
$25.00
Office and Institutional
Non -Residential
634813043861000
37,462.44.
0.860
$50.00
Office and Institutional
Non -Residential
63481304874.4000
43,550.00.
1.000
$60.00
Office and Institutional
Non -Residential
634813130493000
2,322.58
0.053
$25.00
Office and Institutional
Non -Residential
634813131008000
35,195.73
0.808
$50.00
Office and Institutional
Non -Residential
634813132705000
29,227.80
0.671
$50.00
Office and Institutional
Non -Residential.
634813141990000
9,827.76
0.226
$25.00
Office and Institutional
Non -Residential
634813142278000
4,576.67
0.105
$25.00
Office and Institutional
Non -Residential
634813143078000
196.02
0.004
$0.00
Office and Institutional
Non -Residential
634813143275000
890.44
0.020
$25.00
Office and Institutional
Non -Residential
634813143391000
6,429.26
0.148
$25.00
Office and Institutional
Non -Residential
634813148057000
4,353.53
0.100
$25.00
Office and Institutional
Non -Residential
634813149136000
1,149.71
0.026
$25.00
Office and: Institutional
Non -Residential
634813233639000
5,967.41
0.137
$25.00
Office and Institutional
Non -Residential
634813233823000
2,561.211
0.0591
$25.00
Office and Institutional
Non -Residential
634813242033000
27,481.481
0.6311
$50.00
Office and Institutional
Non -Residential
Page 30 of 31

Town of Newport
Stormwater Management Program
Utilltv Fee Structure
.
Tax ID #
AREA(Sq. Ft.)
ACRES
Storm Water
Rate
.
Existing Land Use
Storm Water
Classification
634814325729000
3,811.67
0.088
. .$25.00
Office and Institutional
Non -Residential
634814331457000
318.35
0.007
$15.00
Office and Institutional
Non -Residential
634814331503000
716.83
0.016
$25.00
Office and Institutional
Non -Residential
634814333640000
39,918.12
0.916
$50.00
Office and Institutional
Non -Residential
634814334439000
4,116.98
0.0951
$25.00
Office and Institutional
Non -Residential
634814334454000
103.46
0.002
$0.00
Office and Institutional
Non -Residential
634814344603000
8,974.80
0.206
$25.00
Office and Institutional
Non -Residential
634814347633000
85,857.31
1.971
$60.00
Office and Institutional
Non -Residential
634814433710000
2,797.70
0.064
$25.00
Office and Institutional
Non -Residential
634815630695000
458.26
0.011
$15.00
Office and Institutional
Non -Residential
634813242985000
5,613.631
0.129
$25.00
Office and Institutional
Non -Residential
Page 31 of 31

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Utility Fee Structure
Impervious Surface Calculations
Town of Newport,
North Carolina
Stormwater Management Program
Legend
OCorporate Limits
Property Lines
Impervious Surface Land Uses
— Non -Residential
® Residential
1 inch equals 1,375 feet
N
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I LJ U I I Feet
0 800 1,600 3,200 4,800
l L Od Consulting Planners. Inc.
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