12 Infrastructure and Public Improvements
12.6.1. This section shall not apply to light rail lines or corridors.
12.6.2. To minimize the loss of existing or former railroad corridors which may have public value as corridors for other forms of transportation, railroad corridors designated for preservation on a plan adopted by a governing body shall be identified on development
plans, site plans
and subdivision
plats
.
12.6.3. The rail bed and original right-of-way
shall be designated for the purpose of dedication
or reservation
in accordance with requirements for dedication
and reservation
pursuant to Sec. 12.5, Recreation Land. Dedicated
railroad corridors shall reduce the applicant’s obligation to dedicate
recreation land under Sec. 12.5, Recreation Land, by the amount of the corridor dedicated
.
12.6.4. Unless agreements have been established that prohibit a railroad crossing, the following shall apply:
A. Crossing of the railroad right-of-way
shall be permitted for boulevards and major/minor thoroughfares designated on an adopted transportation plan.
B. No additional at-grade crossings of the corridor by streets or drives shall be allowed, unless a minor special use permit pursuant to Sec. 3.9, Special Use Permit, is approved. In addition to the findings specified in paragraph 3.9.8A, General Findings, the Board of Adjustment shall also find that extreme hardship would result to the property owner
due to:
1. Lack of access; or
2. Design constraints that severely limit the development
potential of the property.
The requirements of this Article shall apply to all development
, unless expressly exempted by the language of the sections below.
The approving authority can require on- and off-site improvements to mitigate the impacts of the proposed development
.
1. All property required to be dedicated
, reserved
or otherwise set aside and identified on the approved site plan
or preliminary plat
shall be surveyed, staked, and appropriately marked and protected prior to beginning clearing and grading
work.
2. All clearing and grading
work shall be in conformance with the approved site plan
or preliminary plat
.
Base floodplain elevation data shall be provided for all development
proposals that are impacted by a floodplain as required by Sec. 8.4, Floodplain and Flood Damage Protection Standards.
Prior to any land disturbing activity
, the applicant shall comply with all Federal, State, and local permitting requirements.
Such facilities shall be located in groupings and with the least possible disturbance to existing trees to the maximum extent allowed by sound engineering practices, as determined by the Public Works director or designee.
Development
shall comply with adopted public plans for the area in which it is located. This includes plans for public facilities
such as rights-of-way, parks and open space
, schools, and other similar facilities.
Permanent survey monuments and markers shall be installed in accordance with N. C. General Statutes 39-32 and 47-30, as supplemented by City/County and N. C. Department of Transportation requirements.
When a proposed site for any public facility
, including but not limited to schools, or other public use sites, is shown on an adopted plan, the site shall be reserved
and/or dedicated
in accordance with paragraph 3.6.7E, Reservation
of Public Facility
Sites and Lands.
A. Storm drainage and utility easements
for water, sanitary sewer, electricity, gas and communications improvements shall be provided in the location and to the width as required by the provider.
B. Easements
for other purposes, including but not limited to trails and greenways, scenic views, historic preservation, cemetery
access, and unique natural sites, shall be designed for reservation
or dedication
as appropriate.
C. All site plans
and plats
shall exhibit standard easement
notes stating the type and purpose of the easement
along with a list of prohibited uses/activities within the easement
.
D. Any cross access agreement shall specify maintenance responsibilities and require that access be unrestricted. The agreement and a plat
depicting the easement
shall be recorded. Copies of the recorded documents and an attorney certification that the requirements of this paragraph have been met shall be provided to the Planning Director or designee.
Dedicated
and publicly maintained streets shall be required for development
in all districts except as described in paragraph 12.2.2A, Private Streets or Roads
. An unlimited number of building
permits can be issued for land parcels
adjacent
to a public street that is not maintained by either the City or NCDOT. However, no occupancy permits shall be issued unless the street has been accepted for maintenance by the City or NCDOT, as appropriate, or the construction has been certified to be acceptable for maintenance by the City or NCDOT, as appropriate, or a surety instrument has been posted in an amount adequate to complete construction to the satisfaction of the City Public Works Director or NCDOT, or appropriate designees. For streets outside the corporate limits, the applicant shall request NCDOT maintenance as soon as the NCDOT occupancy requirement is met; not more than twice the minimum number of units required for maintenance by NCDOT shall be issued Certificates of Occupancy prior to acceptance for maintenance by NCDOT.
No building
shall be erected or enlarged on a parcel
in any district unless such parcel
abuts upon or has access to a publicly accepted and maintained street, except in the following circumstances.
Private streets or roads
are allowed in the following circumstances. Such streets shall be designed and constructed to meet or exceed public street standards of the City of Durham or NCDOT standards, as applicable. If the City or NCDOT does not conduct the inspection to certify the design and construction of the private street(s), inspection and certification by a third-party engineering firm approved by the City or NCDOT, as applicable, shall be provided.
a. For up to six single-family
detached or duplex lots. Lots permanently protected as open space
, on which no development
rights remain, shall not be counted in determining the number of lots on a private street;
b. For multifamily
developments
or multifamily
areas of development
;
c. If shown on an approved development plan
as private streets;
d. Within Conservation Subdivisions
designed and established pursuant to paragraph 6.2.4, Conservation Subdivision
; or
e. (County only) For single-family
subdivisions
that meet both of the following conditions:
(1) The private street(s) are within an additional phase to an existing single-family
subdivision
that already maintain private streets; and
(2) The subdivision
as a whole crosses a County line in which the other county allows private streets.
For any nonresidential development
in a nonresidential district.
Unless otherwise allowed in this Ordinance, ingress/egress easements
not involving construction of a private street shall be permitted in the following circumstances:
Easements
shall be allowed for one single-family
residence on an existing lot of record
as of September 16, 1996. The parcel
shall not be further subdivided.
Ingress/egress/regress easements
of record that were recorded as of September 16, 1996, can continue to serve as access.
A driveway
shall be allowed for vehicular access to multiple parcels
or lots:
(1) Within a townhouse
or detached rowhouse development
or shopping center
, even if those parcels
or lots are individually owned. Any such driveway
within a townhouse
or detached rowhouse development
shall be located entirely in a common area; or
(2) Within projects utilizing the Multiple Flags provisions as described in Section 6.12.6.
c. Driveways
and other ingress/egress easements
serving a residential development
may extend through a non-residential zoning and may be used to satisfy access requirements. This is allowed if:
(1) The non-residential zoning allows for the same type of residential use as the zoning of the residential parcel
(s), and
(2) The access drive or easement
is not within an existing or proposed vehicle
use area.
Prior to acceptance by the City, any private street, or any driveway
allowed for access within a townhouse
or detached rowhouse development
or shopping center
under paragraph 12.2.2B.2.b. above, that is not constructed and maintained to City or NCDOT street standards shall be improved to City street standards.
A. External motor vehicle
access to development
shall be provided as indicated below. In determining the number of access points that shall be required, the cumulative impacts of prior developments
on the roads
shall be considered.
Table 1: Minimum Development | ||
|---|---|---|
Development | Minimum number of Vehicular Access Points Required | Minimum Number of Pedestrian Access Points Required |
Residential Uses | ||
90 Dwellings or Fewer | 1 | 1 |
91 Dwellings or More | 2 | 2 |
All Other Uses | ||
Less than 5 Acres | 1 | 1 |
5 Acres or More | 2 | 2 |
Standalone apartment complexes which consist of a single building
and independent of the number of dwelling units
, shall require a minimum of one point of vehicular and pedestrian access.
The requirements for vehicular and pedestrian access points required in 12.2.4 shall not apply to Design Districts, see Sec. 16.4, Streetscape
, Right-of-Way
, and Block
/Lot Standards.
Within any proposed development
, the proposed street layout shall be coordinated with the existing and planned street system of the surrounding area, with respect to location, alignment, and cross-section. Street design shall satisfy the minimum requirements of the City Public Works Director, City Transportation, NCDOT, or applicable designees.
1. A proposed right-of-way
shall be of sufficient width to accommodate the required cross section of the roadway. In no case shall the proposed right-of-way
be less than the currently adopted standards by the City or NCDOT, as applicable.
2. Right-of-way
shall be dedicated
and/or reserved
and improvements installed to City or NCDOT standards for each class of street as follows:
The entire right-of-way
shall be reserved
for future acquisition and improvement by the public.
(1) New Streets
The right-of-way
required to accommodate the proposed development
shall be dedicated
, with the remainder reserved
. The applicant shall be required to install improvements sufficient to service traffic demands of proposed development
.
(2) Existing Streets
The applicant shall dedicate
or reserve
additional right-of-way
and install improvements as required to serve proposed development
. Other improvements shall be installed according to the City Public Works Reference Guide for Development
or NCDOT standards, as applicable.
3. Right-of-way
dedication
shall be for the purposes of conformance to adopted plans or for the accommodation of other public purposes such as but not limited to streets, sidewalks, bicycle facilities, and utilities. Dedication
of right-of-way
that does not satisfy, or aid in satisfying, an identified public purpose shall not be shown or approved on any applicable site plan
or plat
.
Proposed streets shall be designed in accordance with the standards and specifications of the City Public Works Department or NCDOT, as applicable.
1. Street intersections shall be as nearly at right angles as possible with no intersection angle less than the minimum established by the City Transportation Department or NCDOT, as applicable.
2. Offset intersections shall only be allowed on streets which cannot be aligned, and shall be separated by a minimum distance determined by the City Transportation Department or NCDOT, as applicable, considering possible signalization, necessary storage, and sight distance, as well as other design constraints.
3. Adequate sight distances shall be provided at all intersections between streets and at driveway
intersections with streets.
4. Property lines at corners of all intersecting streets shall, as a minimum, be established as the hypotenuse of a triangle with each leg having a length of at least 20 feet or as required by the City Transportation Department or NCDOT along both street rights-of-way.
At intersecting streets, a sight triangle shall be established. The sight triangle shall be formed by connecting two points along the pavement edges or the extended lines of the pavement edges, 25 feet from where those extended lines meet.

For any driveway
, a sight triangle measuring ten feet from the back of curb and extending 70 feet from the edge of each side of the driveway
shall be required.

Within the sight triangle, no materials which would impede traffic visibility shall be allowed. Structures, fences and plant materials that extend into the sight triangle between two and one half feet and eight feet in height, as measured from the grade
of the street or drive, shall not be allowed.
Alternative dimensions shall be approved by the City Transportation Director or designee if the proposed dimensions will function as adequately as or better than standard Ordinance dimensions. The alternative dimensions shall be sealed by a qualified design professional, and designed utilizing the following criteria based upon industry standards such as, but not limited to, A Policy on Geometric Design of Highways and Streets by the American Association of State Highway and Transportation Officials (commonly known as the AASHTO green book); Traffic Engineering Handbook by the Institute of Transportation Engineers; or Roundabouts: An Informational Guide by the U.S. Department of Transportation Federal Highway Administration.
a. Street width
;
b. Posted speed limits;
c. Stopping position;
d. Field obstructions
;
e. Horizontal and vertical curves;
f. Travel direction (one-way vs. two-way streets); and
g. Traffic control measures (signals, roundabouts, etc.).
Cul-de-sac
streets shall not be longer than 800 feet and shall be terminated by a circular right-of-way
having a minimum diameter of 92 feet or an approved alternative turnaround as determined by the City Transportation Director or NCDOT, or appropriate designees. The length of cul-de-sac
streets shall be measured from the centerline of the bulb to the edge of pavement at the nearest intersection.
1. Unless exempted below, stub outs
shall be required on each side (as defined by each of the cardinal directions) of a development
as follows:
Table 1 | |
|---|---|
Lineal Stub Out | Applicable Zoning Districts |
At least one stub out | RU-M, RC (20 max); RS-M(D) (18 max); PDR (above 8.000); CSD; MU; CD; DD; CI; CN |
At least one stub out | RU-5 (8 max); RS-M (8 max); RS-8 (5 max); PDR (below 8); OI; CG; CC |
At least one stub out | RR; RS-20 (2 max); RS-10 (4 max); I; IL; IP; SRP; UC |
a. Adjacent
existing development
has not made any accommodation for such connections; or
b. Adjacent
sites are permanently protected from development
through conservation easements
or ownership that precludes development
; or
c. The only point of access would require crossing floodplains, steep slopes, or other similar natural features; or
d. The existing street pattern in the area of the proposed development
already provides for vehicular connections at intervals no greater than one-half mile apart in the Rural Tier, one-quarter mile apart in the Suburban Tier, or one-fifth mile apart in the Urban Tier.
The proposed street layout in new development
shall be coordinated with the existing street system with connections made at all stub outs
. Stub outs shall be built to the edge of the site.
a. Alternatives to building
to the edge of the site are allowed per the following:
(1) A determination is made by NCDEQ that prevents the full construction of the stub, in which case the stub shall be constructed to the extent allowed by NCDEQ. The following shall also be required:
(a) A payment-in-lieu for the remainder of the stub out
shall be provided pursuant to the requirements of the City’s Reference Guide for Development
.
(b) Construction and slope easements
, and the right-of-way
required to build the stub out
, shall be dedicated
.
(2) Any other request to modify this requirement will require a variance
for the minimum modification necessary to provide relief, per Sec. 3.16, Variance
. If a variance
is approved, the following shall also be required:
(a) A payment in lieu of construction shall be required pursuant to the requirements of the City’s Reference Guide for Development
.
(b) Construction and slope easements
, and the right-of-way
required to build the stub out
, shall be dedicated
.
b. Where no full connection can be made as a result of the topography of the site being developed
, the developer
shall install a cul-de-sac
bulb or other turnout facility at the stub out
constructed according to the City of Durham Reference Guide for Development
..
A four square foot sign
that reads “Future Street Connection” shall be place at the center of the terminus of the street stub, facing oncoming traffic, and measuring five to six feet in height from the ground. The sign
shall comply with any applicable City of Durham Department of Transportation, NCDOT, and MUTCD standards.
Alleys
shall be permitted and designed in accordance with design criteria established by the City or NCDOT, as applicable.
The reservation
of private property strips of too narrow a depth to permit development
as a means of controlling access to public ways shall not be permitted.
Where a development
abuts or contains a controlled or limited access right-of-way
, whether existing or proposed, an access street or frontage road
shall be required.
1. The provisions of this section shall apply to the initial naming and renaming pursuant to Sec. 3.25, Street Naming and Renaming.
2. Extensions of existing, named streets shall bear the existing street name.
3. Except for the naming or renaming of a street or right-of-way
with a full or proper name, the Planning Director or designee, in consultation with the Durham Emergency Communications Center, shall be the approving authority for initial street names, or as provided by NCDOT procedures for right-of-way
under NCDOT control.
a. Except for a full or proper name, the initial naming of a right-of-way
or driveway
, as allowed in this section, shall be reviewed for approval on a final plat
.
b. Approval of a full or proper name street name shall require approval by the applicable governing body, and NCDOT if applicable.
c. Approval of a street renaming shall be pursuant to Sec. 3.25, Street Naming and Renaming.
A street name shall be established for a public street or a private street.
A street name can be established for a driveway
allowed for access within a townhouse
or detached rowhouse development
under paragraph 12.2.2B.2.b. above, and for a pedestrian mall
under paragraph 16.4.3C, Pedestrian Malls
. Establishing a name shall not result in circumventing development
requirements for private streets, sidewalks, street trees, or other items.
The following rules shall apply for approval of any new street name.
1. Names submitted for approval of a new development
shall be limited to only the number of names needed for the development
. No extra names shall be reserved
for future applications.
2. Names shall only be used for the project for which they were approved and shall not be used for other locations or projects.
3. Approval of names includes the approval of the spelling. A variation from the approved spelling shall not be allowed.
4. Each street name shall consist of at least two parts: the primary name and the street suffix type. The approval of the street suffix is part of the street name approval. Street suffixes shall only be from the official USPS list.
5. A street suffix shall not be part of, or come before, a primary name.
Commentary: For example, “LEAFY DRIVE ROAD
” would not be approved because “Drive” is a suffix used as a part of the primary name. “AVENUE OF AMERICAS” places the suffix before the primary name, and is therefore not approvable.
a. Names shall not duplicate, or approximate or vary, an existing name in spelling or pronunciation.
Commentary: For example, “MAIN STREET” is an existing name, therefore “MANE STREET,” “MAINE STREET,” and “MAIN DRIVE” would not be approved.
b. The prohibition on duplicate or approximate names shall apply to a component of a name.
Commentary: For example, OAKS DRIVE, OAK RIDGE DRIVE, and OAK PLEASANT DRIVE all contain “Oak” as the primary name or a component of the primary name.
c. Words or names which are difficult to pronounce, and words in which the pronunciation is different than spelling, and therefore may cause confusion for citizens, users, and service providers, shall not be used.
d. Full names or proper names shall only be approved by the applicable governing body.
7. Cardinal directions shall not be used in a manner that is inconsistent with the current addressing system, or in a manner that would cause confusion.
Commentary: For example, EAST APPALACHIA DRIVE would not be approved if there were no corresponding WEST/NORTH/SOUTH APPALACHIA DRIVE. Additionally, a directional name will not be approved as a standalone name in a location that is contrary to the directional portion of the name. For example, NORTH COAST ROAD
would not be appropriate along the south shores of Jordan Lake.
a. Numbers, spelled out or symbolized, shall not be used in the street name.
b. Abbreviations or acronyms shall not be used in the street name.
c. Special characters such as hyphens, symbols, apostrophes or other punctuation, or signs
shall not be used as characters in the street name.
d. Extensions or conjunctions shall not be used in the street name.
e. The maximum length for street names shall be twenty characters.
A. Standard street name signs
shall be installed at one corner of all street intersections, including private streets and named driveways
allowed for access within townhouse
or detached rowhouse developments
under paragraph 12.2.2B.2.b above. The size, design, materials, location, fabrication, installation, and maintenance of the signs
and poles within the public right-of-way
and elsewhere shall be in accordance with City Transportation Department or NCDOT standards, as applicable. The developer
or owner
of a private street or a common area in which a named driveway
is located shall be responsible for permanent maintenance as well as fabrication and installation.
B. Signs
denoting the beginning and ending of public maintenance shall also be erected and maintained on private streets and shall be required on named driveways
allowed for access within townhouse
or detached rowhouse developments
under paragraph 12.2.2B.2.b above that intersect with the public right-of-way
. All such signs
shall conform to the street name sign
requirements of paragraph A above.
C. Signs
denoting the right-of-way
boundaries of dedicated
or reserved
, unopened streets shall be erected and maintained according to City or County standards.
Street lighting, as required for traffic safety and property security, shall be installed in conformance with City Transportation Department or NCDOT policies, as applicable. The design, materials, location, and installation shall conform to all applicable City Transportation Department or NCDOT standards, and applicable public utility
standards, including appropriate separation from street trees.
A. Sidewalk, walkway, on-road improvements, and trail systems sufficient to serve both existing and projected pedestrian and cyclist needs shall be labeled on all site and subdivision
plans. Such systems shall be designed to connect with all elements within the development
, adjacent
areas, and transit stops and can include sidewalks along public or private streets, wide outside travel lanes, bike lanes on roadways, and walkways and trails in alternative locations as appropriate. Design, location, dimensions, dedications
, easements
, and reservations
shall conform to applicable City and County policies and plans for sidewalks, bicycle routes, and trails.
B. Walkways and trails shall be designed to maximize the safety of users and the security of adjoining properties with respect to location, visibility, and landscaping.
A. A sidewalk shall be provided along public or private right-of-way
as shown in the table below.
Street Type | Rural Tier | All Other Tiers |
|---|---|---|
None | None | |
All other streets | None | Both Sides |
B. Preliminary and minor plats
, and developments
required to improve existing right-of-way
to City or NCDOT standards, as applicable, shall provide public sidewalk within right-of-way
pursuant to paragraph 12.4.2A, Sidewalk Requirement.
C. For all other development
except as exempted pursuant to paragraph 12.4.2D, Exemptions, required sidewalk along the right-of-way
frontage of the development
site shall be provided, as applicable per paragraph 12.4.2A, through only one of the following two methods. The following methods shall not be used in combination:
a. Sidewalk shall connect to external sidewalks that extend to the property of the subject development
, including connectivity to crosswalks and end of pavement at all adjacent
intersections.
b. Sidewalk located on-site shall meet the following criteria:
(1) The sidewalks shall be located within a public access easement
;
(2) The maximum distance from the right-of-way
, measured to the closest edge of the sidewalk to the right-of-way
, shall be 20 feet; and
(3) Lighting per Sec. 7.4, Outdoor Lighting, shall be provided either by proposed or existing on-site lighting, or street lights within the right-of-way
.
a. Payment-in-lieu of constructing required sidewalk shall be made at the rate set by the City Council.
b. In order to accommodate future sidewalk, a recorded easement
shall be provided along frontage of the subject property where no sidewalk is proposed if the existing right-of-way
is not of sufficient width to accommodate a sidewalk.
c. Payment-in-lieu shall not remove the requirement of sidewalk per paragraph 12.4.2A for future development
projects, unless exempt per paragraph 12.4.2D, Exemptions.
The following shall be exempt from the installation of public sidewalk:
1. Sidewalk shall not be required when development
submittals consist of only the following:
a. Improvements consist only of unmanned facilities of less than 1,000 square feet, such as storage rooms, mechanical equipment, coolers, or stand-alone ice kiosks;
b. Additional motor vehicle
parking consisting of less than four spaces;
c. Additions of less than 1,000 square feet of building
area;
d. Improvements that are documented to solely bring existing facilities up to current health, safety, or building
code requirements;
e. Grading
and/or utility improvements; or
f. Only requires review by the Planning Department.
2. Public sidewalk shall not be required when documentation is provided that sidewalk will be provided, through a scheduled and funded City or State roadway project, along the location where sidewalk would otherwise be required.
3. Sidewalk shall not be required along unimproved right-of-way
that is not required to be improved as part of the development
project.
1. Alternative pedestrian plans that are valid as of June 1, 2013, except for those approved pursuant to previous UC District requirements, shall remain valid and can develop
sidewalks and/or walkways pursuant to the plan in lieu of sidewalk requirements of this section.
a. If aspects of sidewalk development
are not addressed within the plan, Ordinance requirements shall apply.
b. Plans shall be updated every four years from the date of previous approval to maintain validity, demonstrating areas of completed sidewalks and/or walkways of the plan.
2. Pedestrian plans approved pursuant to previous UC District requirements shall no longer be valid.
1. Sidewalk shall be provided along both sides of public or private right-of-way
.
2. Along right-of-way
with curb and gutter located internal to the development
, sidewalk can be provided at the back-of-curb.
3. Sidewalks and other walkways internal to the SRP-C District can be constructed with any all-weather surface material as long as it meets accessibility standards and, if applicable, meets NCDOT standards.
A. Pedestrian and bicycle facilities shall be clearly marked using NCDOT standard markings, or shall be based on the Manual on Uniform Traffic Control Devices.
B. Adjacent
public greenways shall be connected to pedestrian and bicycle facilities on the site.
C. Pedestrian and bicycle connections shall be made to any existing or proposed off-site pedestrian, bicycle, and transit facilities.
1. Walkways shall be provided to satisfy paragraph 12.4.1, General. Additionally, walkways shall be provided along common access driveways
and areas that serve as ingress/egress for the development
site pursuant to paragraph 12.2.2B.2.b, Driveways
, as follows:
a. A walkway shall be placed along both sides of the driveway
or area.
b. The walkway shall be located no more than five feet from the edge of driveway
or area.
c. Driveways
and areas that solely serve as access for rear-loaded townhouses
or detached rowhouses or loading areas
for nonresidential buildings shall not require walkways.
2. The minimum width of internal walkways shall be four feet, or as required by the State accessibility code, whichever is greater.
3. Walkways shall be constructed of an all-weather solid surface material such as concrete, asphalt, or another similar material that would satisfy the State accessibility code.
1. In right-of-way
with curb and gutter, sidewalks shall be a minimum of five feet in width with a minimum three-foot grass strip between the sidewalk and curb, unless otherwise specified in this Ordinance.
a. A wider grass strip or planting area shall be required as necessary to accommodate street trees planted within rights-of-way.
b. Alternative widths can be allowed if permitted pursuant to development
guidelines maintained by the City Public Works Director, or NCDOT, as applicable.
2. Conventional sidewalks shall be constructed of concrete unless an alternate material is approved by the City Public Works Director, or Designee.
3. Along strip-paved roads
sidewalks shall be located behind the roadside ditch or guardrail.
Either wide outside travel lanes or bicycle lanes, as determined by the City Transportation Director or NCDOT, or appropriate designees, shall be a part of any road
improvement made on roadways which are indicated as bicycle routes on the Durham Trails and Greenways Master Plan, the Metropolitan Planning Organization's Transportation Plan, or other adopted bicycle plan.
Rather than utilize separate pedestrian and bicycle facilities, shared facilities with a 10 foot minimum width are allowed in any area where both sidewalks and bicycle facilities are required, unless separate facilities have been previously developed
or approved in the area. Shared facilities of that same width shall be required, however, following the initial installation of shared facilities in the area.
Pedestrians and bicycles shall be accommodated as shown in the table below. All street design standards shall be established by the City Transportation Director or NCDOT, or appropriate designees.
Standard | Rural Tier | Suburban Tier | Urban Tier | Compact Neighborhood/ Downtown Tiers |
|---|---|---|---|---|
PEDESTRIAN FACILITIES | ||||
Public sidewalk, 5 feet minimum, all roadways (see paragraph 12.4.2, Sidewalk Requirement) | No | Yes | Yes | Yes |
Pedestrian crossing treatment at intersections (marked crosswalk, bulb-out, hot button etc.) | No | Yes | Yes | Yes |
Pedestrian routes in parking areas protected from vehicular traffic | No | Yes | Yes | Yes |
BICYCLE FACILITIES | ||||
Bike lanes on all boulevards and thoroughfares, either 4-foot minimum width striped outside gutter edge or 14-foot outside lanes, determined on a case-by-case basis | Yes | Yes | Yes | Yes |
1. The applicant for a residential development
shall be responsible for either:
a. Dedicating
1,150 square feet of land for recreation purposes (including active and passive recreation
areas, including trails) for each proposed dwelling unit
; or
b. Making payment-in-lieu equivalent to the tax value of 1,150 square feet of comparable property per dwelling unit
.
2. One of the following shall be required:
a. Dedication
of land; or
b. Payment-in-lieu of dedication
.
1. The applicant for a residential development
shall be responsible for:
a. Paying a recreation impact fee or dedicating
575 square feet of land for parks and active recreation
areas for each proposed dwelling unit
; and
b. Paying a resource based recreation impact fee or dedicating
575 square feet of land for passive recreation
areas (including trails) for each proposed dwelling unit
.
2. Where recreation service districts have been established, payments made under this section shall be expended within the respective district from which collected.
3. The following, individually or in combination, shall be required based upon jurisdiction and whether the development
is located on the Durham Trails and Greenways Master Plan or the Durham Comprehensive Bicycle Transportation Plan:
a. Payment of an impact fee;
b. Dedication
of land; or
c. Payment-in-lieu of dedication
.
Proposed additions to public systems shall be coordinated with the existing systems and shall satisfy the design and construction standards and specifications of the utility providing the services. Where not otherwise prohibited by local ordinance, community systems, or systems designed to serve more than one user independent of public systems, shall satisfy the standards of the applicable agency
responsible for approval.
Installation of improvements which are extensions to existing public systems shall be approved by the public utility
providing the services. Sanitary sewer systems may be extended into the Rural Tier in the following instances:
1. In the County jurisdiction, and within the City jurisdiction where no State approval has been issued, approval of a major special use permit pursuant to Sec. 3.9, Special Use Permit, provided that:
a. Pump stations are equipped with battery-backed alarm systems connected by an automatic dialer to a 24-hour maintenance service; and
b. Provision is made for connection to a portable generator.
2. To serve an existing use or structure
for which a health hazard has been documented by the County health department or the State of North Carolina.
The additional requirements of paragraph 8.7.2, General Requirements shall apply in watershed
protection overlays.
Community systems designed to serve more than one user independent of public systems shall be allowed if approved by the State of North Carolina.
Soils evaluation by a qualified soil scientist, early in the approval process, is recommended where the use of individual on-site wastewater disposal
systems is anticipated.
A. Any land-disturbing activity may be required to provide stormwater
management facilities or make other improvements to the existing drainage system to address water quantity concerns, water quality concerns, or both if the proposed development
will increase potential flood damages to existing properties or significantly increase pollutant levels in downstream receiving waters.
B. Stormwater
management facilities adequate to accommodate a ten-year or greater storm shall be provided that generally follow existing natural drainage systems. Piping and modification of streams
and other natural water courses should be minimized and shall be considered on a case-by-case basis to determine if it is necessary and environmentally sound. Such facilities shall be designed, constructed and maintained to minimize flooding, protect downslope properties, preserve water quality, and adequately transport existing and projected stormwater
flows.
C. Development
plans, site plans
, and preliminary plats
shall require a stormwater
impact analysis that complies with the requirements of the City Public Works Director or County Engineer, or appropriate designees, and which determines the impact of the increased stormwater runoff
on downstream stormwater
facilities and properties.
D. The need for stormwater
management facilities to address offsite impacts shall be determined by the City Public Works Director or County Engineer, or their designees, as appropriate.
City stormwater
facilities shall be regulated pursuant to the applicable City code.
County stormwater
facilities shall be regulated pursuant to the applicable County code.
A. The applicant shall arrange for the coordinated installation of all other proposed utilities, including gas, electricity, and communications improvements, and shall ensure that site plans
, preliminary plats
, and final plats
clearly show all related easements
and right-of-way
.
B. Utilities shall be installed underground for any subdivision
requiring preliminary plat
approval, except as follows:
1. Where electric transmission lines cannot be installed underground.
2. Electric transmission lines are located outside of the boundary of the development
site and are existing above ground at time of application, even if subsequently relocated as part of the development
.
A. This Section is adopted for the purposes of:
1. Regulating private, non-exempt land-disturbing activity to control accelerated erosion
and sedimentation
in order to prevent the pollution of water and other damage to lakes, watercourses
and other public and private property by sedimentation
; and
2. Establishing procedures through which these purposes can be fulfilled.
B. No person
shall undertake any land-disturbing activity without first obtaining a permit from the Sedimentation
and Erosion
Control Officer
or designee as required by this section.
The following activities do not require a permit under this section:
1. Land-disturbing activities for the purpose of fighting fires;
2. Land-disturbing activities that are less than 12,000 square feet in surface area. In determining the area, lands under one or diverse ownership being developed
as a unit will be aggregated. Notwithstanding this provision, an erosion control plan
and/or permit may be required by the Sedimentation
and Erosion
Control Officer
or designee when off-site damage is occurring, or if the potential for off-site damage exists. Additionally, this section may apply when the applicant, or a parent
, subsidiary
, or other affiliate
of the applicant has engaged in any activity enumerated in paragraph 3.8.7, Disapproval of Plan;
As set forth in NCGS § 113A-52.01, land-disturbing activities relating or incidental to the production of crops
, grains, fruits, vegetables, ornamental and flowering plants, dairy, livestock
, poultry, and all other forms of agriculture undertaken
on agricultural land for the production of plants and animals useful to man, including but not limited to:
a. Forage and sod crops
, grain and feed crops
, tobacco, cotton and peanuts;
b. Dairy animals and dairy products;
c. Poultry and poultry products;
d. Livestock
, including beef cattle, llamas, sheep, swine, horses, ponies, mules or goats, including the breeding and grazing of any or all such animals;
e. Bees and apiary products;
f. Fur animals; and
g. Mulch, ornamental plants, and other horticultural products. For purposes of this section, “mulch” means substances composed primarily of plant remains or mixtures of such substances;
4. Land-disturbing activities undertaken
on forest land for the production and harvesting of timber and timber products and which are conducted in accordance with best management practices set out in Forest Practice Guidelines Related to Water Quality, as adopted by the North Carolina Department of Agriculture and Consumer Services. If land-disturbing activity undertaken
on forestland for the production and harvesting of timber and timber products is not conducted in accordance with Forest Practice Guidelines Related to Water Quality, the provisions of this Article shall apply to such activity and any related land-disturbing activity;
5. Land-disturbing activities undertaken
by persons
as defined in NCGS § 113A-52(8) who are otherwise regulated by the provisions of the Mining
Act of 1971, NCGS § 74-46 – 74-68;
6. Land-disturbing activities over which the state has exclusive regulatory jurisdiction as provided in NCGS § 113A-56(a);
7. Land-disturbing activities undertaken
for the duration of an emergency, activities essential to protect human life;
8. Activities undertaken
to restore the wetland
functions of converted wetlands
to provide compensatory mitigation to offset impacts permitted under Section 404 of the Clean Water Act; and
9. Activities undertaken
pursuant to Natural Resources Conservation Service standards to restore the wetlands
functions of converted wetlands
as defined in Title 7 Code of Federal Regulations Sec. 12.2 (January 1, 2014 Edition).
Subject to the exemptions listed in subsection 12.10.2, a sedimentation
and erosion control plan
shall be required for any land-disturbing activity within the County, including the City, if more than 20,000 aggregate square feet will be disturbed, or if 12,000 or more aggregate square feet will be disturbed in a M/LR-A, M/LR-B, F/J-A, E-A, or E-A(2) watershed
protection overlay district. The Sedimentation
and Erosion
Control Officer
or designee may also require a plan for any land-disturbing activity if it determines that off-site damage is occurring or the potential for off-site damage exists. A plan may also be required when the applicant, or a parent
, subsidiary
, or other affiliate
of the applicant, has engaged in any activity listed in paragraph 3.8.7, Disapproval of Plan.
| Less than 12,000 s.f. | 12,000 s.f. to | More than 20,000 s.f. |
|---|---|---|---|
Plan | MR | MR(*R) | R |
Permit | MR | R | R |
MR – May be required when off-site damage is occurring, the potential for off-site damage exists, or if the applicant or a parent R – Required. *R – Required in a Lake Michie/Little River Critical Area (M/LR-A), Lake Michie/Little River Protected Area (M/LR-B), Falls/Jordan Critical Area (F/J-A) and Eno River Critical Areas (E-A; E-A(2)). | |||
Persons
conducting land-disturbing activity shall take all reasonable measures to protect all public and private property from damage caused by such activity.
Whenever conflicts exist between federal, State or local laws, ordinances or rules, the more restrictive provision shall apply.
In order for a sedimentation
and erosion control plan
to be approved, the following control objectives shall be met:
On-site areas which are subject to severe erosion
, and off-site areas which are especially vulnerable to damage from erosion
and/or sedimentation
, are to be identified and receive special attention;
All land-disturbing activity is to be planned and conducted to limit exposure to the shortest feasible time;
All land-disturbing activity is to be planned and conducted to minimize the size of the area to be exposed at any one time;
Surface water runoff
originating upgrade of exposed areas shall be controlled to reduce erosion
and sediment
loss during the period of exposure;
All land-disturbing activity is to be planned and conducted so as to restrain off-site sedimentation
damage; and
When the increase in the velocity of stormwater runoff
resulting from a land-disturbing activity is sufficient to cause accelerated erosion
of the receiving watercourse
, plans are to include measures to control the velocity at the point of discharge so as to minimize accelerated erosion
of the site and increased sedimentation
of the stream
.
No land-disturbing activity shall occur except in accordance with the mandatory standards listed below. Except where more stringent standards are specified in this Ordinance, the technical standards and specifications contained in the North Carolina Erosion
and Sediment
Control Planning and Design Manual shall also apply. In addition, for land-disturbing activities greater than or equal to one acre, requirements within the most recent version of the State of North Carolina General Permit No. NCG010000 shall apply.
Except where more stringent buffer
requirements are specified in Article 8, Environmental Protection, and/or Article 9, Landscaping and Buffering, the following requirements shall apply;
1. No land-disturbing activity during periods of construction or improvement to land shall be permitted in proximity to a lake or natural watercourse
unless a buffer zone
is provided along the margin of the watercourse
of sufficient width to confine visible siltation
within the 25% of the buffer zone
nearest the land-disturbing activity. This subsection shall not apply to a land-disturbing activity in connection with the construction of facilities to be located on, over or under a lake or natural watercourse
; and
2. Unless otherwise provided, the width of a buffer zone
is measured from the top of the bank nearest edge of the disturbed area, with the 25% of the strip nearer the land-disturbing activity containing natural or artificial means of confining visible siltation
.
3. Two rows of silt fence shall be placed along all buffer
zones. Rows should be spaced a minimum of three (3) feet apart.
The angle for disturbed land shall be no greater than the angle which can be retained by vegetative cover or other adequate erosion
control devices or structures.
Land left exposed shall be planted or otherwise provided with temporary ground cover
, devices, or structures sufficient to restrain erosion
within the applicable time period after completion of any phase of grading
or period of inactivity as follows: seven days for a steep slope; 10 days for a moderate slope; 14 days for land with no slope or inclination. For purposes of this section, a moderate slope means an inclined area, the inclination of which is less than or equal to three units of horizontal distance to one unit of vertical distance; and a steep slope means an inclined area, the inclination of which is greater than three units of horizontal distance to one unit of vertical distance. No other criteria apply.
Commentary: The moderate and steep slope definitions in this section are mandated by State law (S.L. 2009-486) for sedimentation
and erosion
control purposes. This steep slope definition differs from the steep slope definition under UDO Sec. 8.8, Steep Slope Protection Standards, which is otherwise applicable throughout the UDO.
Soil stockpiles shall be limited to the shorter of 30 feet above existing grade
or half the height of adjacent
existing mature tree cover. Stockpiles shall be wrapped in two rows of silt fence, and groundcover shall be planted in accordance with this section. Stockpile slopes shall be 2:1 or flatter.
For any area of land-disturbing activity where grading
activities have been completed, temporary or permanent ground cover
sufficient to restrain erosion
shall be provided as soon as practicable, but in no case later than seven days after completion of grading
.
Whenever land-disturbing activity exceeds 12,000 square feet, the person
conducting the land-disturbing activity shall install such sedimentation
and erosion
control devices and practices as are sufficient to retain the sediment
generated by the land-disturbing activity within the boundaries of the tract
during construction upon and development
of such tract
, and shall plant or otherwise provide a temporary ground cover
sufficient to restrain erosion
generated by such devices and practices within seven days.
D. Erosion
and sedimentation
control measures, structures and devices shall be so planned, designed and constructed as to provide protection from the calculated maximum peak of runoff
from the 25-year storm. Runoff
rates shall be calculated using the procedures in the USDA, Soil Conservation Service's "National Engineering Field Manual for Conservation Practices," or other calculation procedures acceptable to the Sedimentation
and Erosion
Control Officer
or designee.
E. Each sediment
basin or trap in the Suburban or Rural Tier shall have a minimum volume of 3,600 cubic feet per acre of disturbed area and a minimum surface area of 435 square feet per cfs of Q25 (25-year storm) peak inflow. Each sediment
basin or trap in the Downtown, Compact Neighborhood, or Urban Tier shall have a minimum volume of 1,800 cubic feet per acre of disturbed area and a minimum surface area of 325 square feet per cfs of Q25 peak inflow. A skimmer shall be used in each sediment
basin or trap. If the temporary sediment
basin or trap is to be converted to a permanent stormwater
control measure and the volume is greater than that of the temporary basin, the larger of the two shall be used, unless approved in writing by the Durham County Erosion
Control Office
.
F. Sediment
basins and traps shall be designed and constructed such that the basin will have a settling efficiency of at least 70% for the 40-micron (0.04mm) size soil particle transported into the basin by the runoff
of that two-year storm that produces
the maximum peak rate of runoff
as calculated according to procedures in the United States Department of Agriculture Soil Conservation Service's "National Engineering Field Manual for Conservation Practices" or according to procedures adopted by any other agency
of the State or the United States or any generally recognized organization or association.
G. Sediment
basins and traps shall not be installed in perennial or intermittent streams
.
H. Existing ponds and lakes shall not be used as sediment
basins or traps.
I. Developer
shall retain control of permitted area, including sediment
basins or traps, until permit has been closed. For commercial sites, sold outparcels
shall be permitted separately.
J. Newly constructed open channels shall be designed and constructed with side slopes no steeper than two horizontal to one vertical if a vegetative cover is used for stabilization, unless soil conditions permit steeper slopes or where the slopes are stabilized by using mechanical devices, structural devices or other acceptable ditch liners. In any event, the angle for side slopes shall be sufficient to restrain accelerated erosion
.
K. Additional areas may be added per the criteria enumerated in this section only if the basin or trap is properly installed and maintained.
L. In high quality water HQW zones
es, Lake Michie/Little River Critical Area (M/LR-A), Lake Michie/Little River Protected Area (M/LR-B), Falls/Jordan Critical Area (F/J-A), Eno River Critical Areas (E-A; E-A(2)), and Third Fork Creek Watershed
, uncovered
areas shall be limited at any time to a maximum total area of 20 acres. In high quality water HQW zones
es, only the portion of the land-disturbing activity within a HQW zone shall be governed by this section. Larger areas within HQW may be uncovered
with the written approval of the Director of DEQ, Division of Energy, Mineral and Land Resources. Larger areas within all other zones may be uncovered
with the written approval of the Durham County Erosion
Control Office
.
Triassic soils do not respond as well to conventional erosion
control measures as listed within this ordinance and projects with underlying Triassic soils are thus subject to the following additional requirements:
1. Flocculants shall be used onsite in accordance with the requirements of Section 12.10.4N.
2. Sediment
basins and traps shall have a minimum volume of 5,400 cubic feet per acre of disturbed area and shall be designed so as to dewater in a minimum of 4 days.
3. Moderate and steep slopes shall be stabilized by either matting or hydroseeding in order to more rapidly provide groundcover.
Flocculants are chemicals that can cause fine particles to combine and settle in detained runoff
. When used in conjunction with sediment
basins or traps, they can reduce sediment
in discharge leaving a site. The use of flocculants, where not required by Section 12.10.4M, is recommended in land disturbing activity
. When used, the following requirements apply:
1. A flocculant application plan shall be included on the erosion control plan
, including:
a. Type of Flocculant to be used including manufacturer and supplier;
b. Site-specific dosing systems;
c. Location(s) of flocculant application; and
d. Identification of the individual and/or position responsible for dosing and monitoring of flocculant usage.
2. Soil samples should be obtained from areas where flocculants will be used, and samples should be screened
using jar tests with multiple flocculants to select the appropriate flocculant. Jar testing can be performed by the contractor
or flocculant supplier.
3. Only flocculants listed on the NCDEQ website as an approved product for use in North Carolina shall be used.
4. Flocculant applied in solid form should be evaluated and re-applied if needed after every rainfall event that is equal to or exceeds 0.5 inches.
5. Flocculants shall not be applied directly to surface waters.
6. Flocculants shall be applied upstream of a sediment
basin, trap, or other pooling device such as silt fence.
7. The use of flocculants does not alter the requirements for site stabilization. Sites should be stabilized as soon as possible using conventional methods to minimize the need to use flocculants.
Commentary: Additional information on the use of chemical treatment of construction site stormwater
can be found at: https://cals.ncsu.edu/crop-and-soil-sciences/extension/publications/ (scroll down from top to find Erosion
, Sediment
, and Turbidity Control section).
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.
The land-disturbing activity shall be planned and conducted such that the velocity of stormwater runoff
in the receiving watercourse
at the point of discharge resulting from a 25-year storm after development
shall not exceed the greater of:
1. The velocity specified according to the soil type in the following table, for a point of discharge into a receiving watercourse
with bare soil or rock banks or bed;
Materials | Maximum Permissible Velocities | ||
|---|---|---|---|
Name | Description | FPS1 | MPS2 |
Fine Sand (noncolloidal) | Cecil fine sandy loam, Pinkston fine sandy loam | 2.5 | 0.8 |
Sand Loam (noncolloidal) | Appling sandy loam, Creedmoor sandy loam, Helena sandy loam, Mayodan sandy loam, Wedowee sandy loam, Wilkes sandy loam, White shore sandy loam | 2.5 | 0.8 |
Silt Loam (noncolloidal) | Georgeville silt loam, Herndon silt loam, Lignum silt loam, Roanoke silt loam | 3.0 | 0.9 |
Ordinary Firm Loam | Iredell loam, Mecklenburg loam, Wahee loam, Davidson clay loam, White Store clay loam-eroded | 3.5 | 1.1 |
Fine Gravel |
| 5.0 | 1.5 |
Stiff Clay (very colloidal) | Iredell-Urban land complex, White Store-Urban land complex, Mayodan-Urban land complex | 5.0 | 1.5 |
Graded | Tatum gravelly silt loam, Nason stony silt loam, Goldston slaty (channery) silt loam | 5.0 | 1.5 |
Graded |
| 5.5 | 1.7 |
Alluvial Silts (noncolloidal) | Wehadkee silt loam, Congaree silt loam, Chewacla silt loam, Cartecay silt loam | 3.5 | 1.1 |
Alluvial Silts (colloidal) |
| 5.0 | 1.5 |
Coarse Gravel (noncolloidal) |
| 6.0 | 1.8 |
Cobbles and shingles |
| 5.5 | 1.7 |
Shales and Hard Pans |
| 6.0 | 1.8 |
1 FPS: Feet per second 2 MPS: Meters per second | |||
2. The velocity specified according to the type of vegetation and depth of flow in the following table, for a point of discharge into a vegetated receiving watercourse
; or
Vegetatively Protected Watercourses | |||
|---|---|---|---|
Group No. | Vegetation | Depth of | Maximum Permissible Velocity |
1 | Bermudagrass | up to 1 greater than 1 | 4 6 |
2 | Reed canarygrass; Kentucky bluegrass | up to 1 greater than 1 | 3 6 |
3 | Grass and legumes, mixed; Weeping lovegrass | up to 1 greater than 1 | 3 4 |
4 | Annuals: Annual lespedeza (KOBE); Sudangrass Small grain: (Rye, Oats, barley); Ryegrass | up to 1 greater than 1 | 2.5 2.5 |
Notes Do not use vegetative protection on longitudinal parallel to flow slopes steeper than 10% except for side slopes. Annuals: use only as temporary protection until permanent cover is established. | |||
3. The velocity in the receiving watercourse
determined for the ten-year storm
prior to development
.
C. If the conditions enumerated in paragraph B, Performance Standard, of this subsection cannot be met, the channel below the discharge point
shall be designed and constructed to withstand the expected velocity.
When soils with slopes as indicated in the following table, occur between a point of stormwater
discharge and the next confluence of concentrated stormwater runoff
, such areas, on- or off-site, shall be protected from accelerated erosion
by diverting the stormwater
discharge from those soil surfaces. Diversion may include the provision of piped, paved or armored storm drainage facilities
.
Critical Soils of Durham County | ||
|---|---|---|
ApC | Appling sandy loam | 6-10% slopes |
CfC | Cecil fine sandy loam | 6-10% slopes |
CrC | Creedmoor sandy loam | 6-10% slopes |
DaD | Davidson clay loam | 6-10% slopes |
GeC | Georgeville silt loam | 6-10% slopes |
GeD | Georgeville silt loam | 10-15% slopes |
GIE | Goldston slaty silt loam | 10-25% slopes |
GIF | Goldston slaty silt loam | 25-45% slopes |
GrC | Granville sandy loam | 6-10% slopes |
Gu | Gullied land | Clayey materials |
HeC | Helena sandy loam | 6-10% slopes |
HrC | Herndon silt loam | 6-10% slopes |
HsC | Herndon stony silt loam | 2-10% slopes |
IrC | Iredell loam | 6-10% slopes |
IyC | Iredell-Urban land complex | 6-10% slopes |
MfC | Mayodan sandy loam | 6-10% slopes |
MfD | Mayodan sandy loam | 10-15% slopes |
MfE | Mayodan sandy loam | 15-25% slopes |
MrC | Mayodan-Urban land complex | 0-10% slopes |
MrD | Mayodan-Urban land complex | 10-15% slopes |
MuC | Mecklenburg loam | 6-10% slopes |
NaD | Nason silt loam | 10-15% slopes |
NaE | Nason silt loam | 15-25% slopes |
NoD | Nason stony silt loam | 10-15% slopes |
PfC | Pinkston fine sandy loam | 2-10% slopes |
PfE | Pinkston fine sandy loam | 10-25% slopes |
TaE | Tatum gravelly silt loam | 15-25% slopes |
Ur | Urban land |
|
WmD | Wedowee sandy loam | 10-25% slopes |
WmE | Wedowee sandy loam | 15-25% slopes |
WsC | White Store sandy loam | 6-10% slopes |
WsE | White Store sandy loam | 10-25% slopes |
WvC2 | White Store clay loam | 2-10 % slopes, eroded |
WvE2 | White Store clay loam | 10-25% slopes, eroded |
WwC | White Store-Urban land complex | 0-10% slopes |
WwE | White Store-Urban land complex | 10-25% slopes |
WxE | Wilkes sandy loam | 10-25% slopes |
Measures applied alone or in combination to satisfy the intent of this section are acceptable if there are no objectionable secondary consequences. The State Sedimentation
Control Commission recognizes that the management of stormwater runoff
to minimize or control downstream channel and bank erosion
is a developing
technology. Innovative techniques and ideas will be considered and may be used when shown to have the potential to produce
successful results. Some alternatives are to:
1. Avoid increases in surface runoff
volume and velocity by including measures to promote infiltration to compensate for increased runoff
from areas rendered impervious;
2. Avoid increases in stormwater
discharge velocities by using vegetated or roughened swales and waterways in lieu of closed drains and high velocity paved sections;
3. Provide energy dissipaters
at outlets of storm drainage facilities
to reduce flow velocities at the point of discharge. These may range from simple rip-rapped sections to complex structures; and
4. Protect watercourses
subject to accelerated erosion
by improving cross sections and/or providing erosion
-resistant lining.
This section shall not apply where it can be demonstrated, to the satisfaction of the Sedimentation
and Erosion
Control Officer
or designee that stormwater
discharge velocities will not create an erosion
problem in the receiving watercourses
.
When the person
conducting the land-disturbing activity is also the person
conducting the borrow
or waste
disposal
activity, areas from which borrow
is obtained and which are not regulated by the provisions of the Mining
Act of 1971, and waste
areas for surplus materials other than landfills regulated by the State Department of Environmental Quality’s Division of Solid Waste
Management, shall be considered as part of the land-disturbing activity where the borrow
material is being used or from which the waste
material originated. When the person
conducting the land-disturbing activity is not the person
obtaining the borrow
and/or disposing of the waste
, these areas shall be considered a separate land-disturbing activity. The name and location of any borrow
and/or waste
areas shall be provided to the Durham County Erosion
Control Office
upon request.
Land-disturbing activity in connection with construction in, on, over, or under a lake or natural watercourse
shall minimize the extent and duration of disruption of the stream
channel. Where relocation of a stream
forms an essential part of the proposed activity, the relocation shall minimize unnecessary changes in the stream
flow characteristics.
During the development
of a site, the person
conducting the land-disturbing activity shall install and maintain all temporary and permanent erosion
and sedimentation
control measures as required by the North Carolina Sedimentation
Pollution Control Act of 1973, as amended, and all rules and orders adopted pursuant to it (the Act), this section, rules or orders adopted or issued pursuant to this section or the Act, or an approved sedimentation
and erosion control plan
. After site development
, the land owner
or person
in possession or control of the land shall install and/or maintain all necessary permanent erosion
and sediment
control measures, except those measures installed within a road
or street right-of-way
or easement
accepted for maintenance by a governmental agency
.
Where inspections are required by paragraph 3.8.6, Self-Inspections, the following apply:
A. The person
who performs the inspection shall make a record of the site inspection by documenting the following items:
1. All of the erosion
and sedimentation
control measures, practices and devices, as called for in a construction sequence consistent with the approved erosion
and sedimentation
control plan, including but not limited to sedimentation
control basins, sedimentation
traps, sedimentation
ponds, rock dams, temporary diversions, temporary slope drains, rock check dams, sediment
fence or barriers, all forms of inlet protection, storm drainage facilities
, energy dissipaters
, and stabilization methods of open channels, have initially been installed and do not significantly deviate (as defined in paragraph 12.10.10A.5) from the locations, dimensions and relative elevations shown on the approved erosion
and sedimentation
plan. Such documentation shall be accomplished by initialing and dating each measure or practice shown on a copy of the approved erosion
and sedimentation
control plan or by completing, dating and signing
an inspection report that lists each measure, practice or device shown on the approved erosion
and sedimentation
control plan. This documentation is required only upon the initial installation of the erosion
and sedimentation
control measures, practices and devices as set forth by the approved erosion
and sedimentation
control plan or if the measures, practices and devices are modified after initial installation;
2. The completion of any phase of grading
for all graded
slopes and fills shown on the approved erosion
and sedimentation
control plan, specifically noting the location and condition of the graded
slopes and fills. Such documentation shall be accomplished by initialing and dating a copy of the approved erosion
and sedimentation
control plan or by completing, dating and signing
an inspection report;
3. The location of temporary or permanent ground cover
, and that the installation of the ground cover
does not significantly deviate (as defined in paragraph 12.10.10A.5) from the approved erosion
and sedimentation
control plan. Such documentation shall be accomplished by initialing and dating a copy of the approved erosion
and sedimentation
control plan or by completing, dating and signing
an inspection report;
4. That maintenance and repair requirements for all temporary and permanent erosion
and sedimentation
control measures, practices and devices have been performed. Such documentation shall be accomplished by completing, dating and signing
an inspection report (the general stormwater
permit monitoring form may be used to verify the maintenance and repair requirements); and
5. Any significant deviations from the approved erosion
and sedimentation
control plan, corrective actions required to correct the deviation and completion of the corrective actions. Such documentation shall be accomplished by initialing and dating a copy of the approved erosion
and sedimentation
control plan or by completing, dating and signing
an inspection report. A significant deviation means an omission, alteration or relocation of an erosion
or sedimentation
control measure that prevents the measure from performing as intended.
B. The documentation, whether on a copy of the approved erosion
and sedimentation
control plan or an inspection report, shall include the name, address, affiliation, telephone number, and signature of the person
conducting the inspection and the date of the inspection. Any relevant licenses and certifications may also be included. Any documentation of inspections that occur on a copy of the approved erosion
and sedimentation
control plan shall occur on a single copy of the plan and that plan shall be made available on the site. Any inspection reports shall also be made available on the site.
C. The inspection shall be performed during or after each of the following phases of a plan:
1. Installation of perimeter erosion
and sediment
control measures;
2. Clearing and grubbing of existing ground cover
;
3. Completion of any phase of grading
of slopes or fills that requires provision of temporary or permanent ground cover
pursuant to NCGS § 113A-57(2);
4. Completion of storm drainage facilities
;
5. Completion of construction or development
; and
6. Quarterly until the establishment of permanent ground cover
sufficient to restrain erosion
or until the financially responsible party has conveyed ownership or control of the tract
of land for which the erosion
and sedimentation
control plan has been approved and the agency
that approved the plan has been notified. If the financially responsible party has conveyed ownership or control of the tract
of land for which the erosion
and sedimentation
control plan has been approved, the new owner
or person
in control shall conduct and document inspections quarterly until the establishment of permanent ground cover
sufficient to restrain erosion
.
Whenever the Sedimentation
and Erosion
Control Officer
, or designee, determines that significant sedimentation
is occurring as a result of land-disturbing activity, despite application and maintenance of protective practices, the person
conducting the land-disturbing activity will be required to and shall take the additional protective action directed.
1. A performance guarantee, as described below, shall be for the completion of required improvements if landscaping, recreational facilities, committed elements
, or required infrastructure including but not limited to stormwater
, streets, sidewalks, or water and sewer improvements, has not been completed in accordance with the approved construction drawings, site plan
, or plat
as applicable.
2. For a project requiring multiple guarantees, a single guarantee may be posted in lieu of multiple guarantees. This allowance shall not apply to guarantees required for erosion
control and stormwater
control measures.
1. The responsible department shall require a performance guarantee in the amount of 125% of the reasonable estimated cost to complete the infrastructure or other improvement calculated as of the time the performance guarantee is issued, as determined by the applicable director or designee.
2. Any extension of the performance guarantee necessary to complete required improvements shall not exceed 125% of the reasonably estimated cost of completion of the remaining incomplete improvements still outstanding at the time the extension is obtained, as determined by the applicable director or designee.
The applicable department director or designee shall specify when a performance guarantee shall be submitted.
A performance guarantee may be in the form of a surety bond, letter of credit, or other form of guarantee that provides equivalent security to a surety bond or letter of credit.
A performance guarantee shall be conditioned upon the performance of all work necessary to complete the specified improvements and the delivery of all necessary encroachment
agreements, with said performance and delivery to be done by a specified completion date as allowed per NCGS § 160D-804.1.
The performance guarantee shall be returned or released, as appropriate, in a timely manner upon the acknowledgment by the City or County that the improvements and conditions for which the performance guarantee is being required are complete.
If the improvements are not complete and the current performance guarantee is expiring, the performance guarantee shall be extended, or a new performance guarantee issued, for an additional period limited to the duration necessary to complete required improvements. A developer
shall demonstrate reasonable, good faith progress toward completion of the required improvements that are the subject of the performance guarantee or any extension.
For required improvements other than infrastructure, if the responsible department director or designee determines the completion of the improvement prior to issuance of a certificate of compliance
is not practicable, and sufficient justification for the delay has been shown, certificates of compliance may be issued if an adequate performance guarantee is provided. In such event, the requirements for performance guarantees within this section shall apply.
12 Infrastructure and Public Improvements
12.6.1. This section shall not apply to light rail lines or corridors.
12.6.2. To minimize the loss of existing or former railroad corridors which may have public value as corridors for other forms of transportation, railroad corridors designated for preservation on a plan adopted by a governing body shall be identified on development
plans, site plans
and subdivision
plats
.
12.6.3. The rail bed and original right-of-way
shall be designated for the purpose of dedication
or reservation
in accordance with requirements for dedication
and reservation
pursuant to Sec. 12.5, Recreation Land. Dedicated
railroad corridors shall reduce the applicant’s obligation to dedicate
recreation land under Sec. 12.5, Recreation Land, by the amount of the corridor dedicated
.
12.6.4. Unless agreements have been established that prohibit a railroad crossing, the following shall apply:
A. Crossing of the railroad right-of-way
shall be permitted for boulevards and major/minor thoroughfares designated on an adopted transportation plan.
B. No additional at-grade crossings of the corridor by streets or drives shall be allowed, unless a minor special use permit pursuant to Sec. 3.9, Special Use Permit, is approved. In addition to the findings specified in paragraph 3.9.8A, General Findings, the Board of Adjustment shall also find that extreme hardship would result to the property owner
due to:
1. Lack of access; or
2. Design constraints that severely limit the development
potential of the property.
The requirements of this Article shall apply to all development
, unless expressly exempted by the language of the sections below.
The approving authority can require on- and off-site improvements to mitigate the impacts of the proposed development
.
1. All property required to be dedicated
, reserved
or otherwise set aside and identified on the approved site plan
or preliminary plat
shall be surveyed, staked, and appropriately marked and protected prior to beginning clearing and grading
work.
2. All clearing and grading
work shall be in conformance with the approved site plan
or preliminary plat
.
Base floodplain elevation data shall be provided for all development
proposals that are impacted by a floodplain as required by Sec. 8.4, Floodplain and Flood Damage Protection Standards.
Prior to any land disturbing activity
, the applicant shall comply with all Federal, State, and local permitting requirements.
Such facilities shall be located in groupings and with the least possible disturbance to existing trees to the maximum extent allowed by sound engineering practices, as determined by the Public Works director or designee.
Development
shall comply with adopted public plans for the area in which it is located. This includes plans for public facilities
such as rights-of-way, parks and open space
, schools, and other similar facilities.
Permanent survey monuments and markers shall be installed in accordance with N. C. General Statutes 39-32 and 47-30, as supplemented by City/County and N. C. Department of Transportation requirements.
When a proposed site for any public facility
, including but not limited to schools, or other public use sites, is shown on an adopted plan, the site shall be reserved
and/or dedicated
in accordance with paragraph 3.6.7E, Reservation
of Public Facility
Sites and Lands.
A. Storm drainage and utility easements
for water, sanitary sewer, electricity, gas and communications improvements shall be provided in the location and to the width as required by the provider.
B. Easements
for other purposes, including but not limited to trails and greenways, scenic views, historic preservation, cemetery
access, and unique natural sites, shall be designed for reservation
or dedication
as appropriate.
C. All site plans
and plats
shall exhibit standard easement
notes stating the type and purpose of the easement
along with a list of prohibited uses/activities within the easement
.
D. Any cross access agreement shall specify maintenance responsibilities and require that access be unrestricted. The agreement and a plat
depicting the easement
shall be recorded. Copies of the recorded documents and an attorney certification that the requirements of this paragraph have been met shall be provided to the Planning Director or designee.
Dedicated
and publicly maintained streets shall be required for development
in all districts except as described in paragraph 12.2.2A, Private Streets or Roads
. An unlimited number of building
permits can be issued for land parcels
adjacent
to a public street that is not maintained by either the City or NCDOT. However, no occupancy permits shall be issued unless the street has been accepted for maintenance by the City or NCDOT, as appropriate, or the construction has been certified to be acceptable for maintenance by the City or NCDOT, as appropriate, or a surety instrument has been posted in an amount adequate to complete construction to the satisfaction of the City Public Works Director or NCDOT, or appropriate designees. For streets outside the corporate limits, the applicant shall request NCDOT maintenance as soon as the NCDOT occupancy requirement is met; not more than twice the minimum number of units required for maintenance by NCDOT shall be issued Certificates of Occupancy prior to acceptance for maintenance by NCDOT.
No building
shall be erected or enlarged on a parcel
in any district unless such parcel
abuts upon or has access to a publicly accepted and maintained street, except in the following circumstances.
Private streets or roads
are allowed in the following circumstances. Such streets shall be designed and constructed to meet or exceed public street standards of the City of Durham or NCDOT standards, as applicable. If the City or NCDOT does not conduct the inspection to certify the design and construction of the private street(s), inspection and certification by a third-party engineering firm approved by the City or NCDOT, as applicable, shall be provided.
a. For up to six single-family
detached or duplex lots. Lots permanently protected as open space
, on which no development
rights remain, shall not be counted in determining the number of lots on a private street;
b. For multifamily
developments
or multifamily
areas of development
;
c. If shown on an approved development plan
as private streets;
d. Within Conservation Subdivisions
designed and established pursuant to paragraph 6.2.4, Conservation Subdivision
; or
e. (County only) For single-family
subdivisions
that meet both of the following conditions:
(1) The private street(s) are within an additional phase to an existing single-family
subdivision
that already maintain private streets; and
(2) The subdivision
as a whole crosses a County line in which the other county allows private streets.
For any nonresidential development
in a nonresidential district.
Unless otherwise allowed in this Ordinance, ingress/egress easements
not involving construction of a private street shall be permitted in the following circumstances:
Easements
shall be allowed for one single-family
residence on an existing lot of record
as of September 16, 1996. The parcel
shall not be further subdivided.
Ingress/egress/regress easements
of record that were recorded as of September 16, 1996, can continue to serve as access.
A driveway
shall be allowed for vehicular access to multiple parcels
or lots:
(1) Within a townhouse
or detached rowhouse development
or shopping center
, even if those parcels
or lots are individually owned. Any such driveway
within a townhouse
or detached rowhouse development
shall be located entirely in a common area; or
(2) Within projects utilizing the Multiple Flags provisions as described in Section 6.12.6.
c. Driveways
and other ingress/egress easements
serving a residential development
may extend through a non-residential zoning and may be used to satisfy access requirements. This is allowed if:
(1) The non-residential zoning allows for the same type of residential use as the zoning of the residential parcel
(s), and
(2) The access drive or easement
is not within an existing or proposed vehicle
use area.
Prior to acceptance by the City, any private street, or any driveway
allowed for access within a townhouse
or detached rowhouse development
or shopping center
under paragraph 12.2.2B.2.b. above, that is not constructed and maintained to City or NCDOT street standards shall be improved to City street standards.
A. External motor vehicle
access to development
shall be provided as indicated below. In determining the number of access points that shall be required, the cumulative impacts of prior developments
on the roads
shall be considered.
Table 1: Minimum Development | ||
|---|---|---|
Development | Minimum number of Vehicular Access Points Required | Minimum Number of Pedestrian Access Points Required |
Residential Uses | ||
90 Dwellings or Fewer | 1 | 1 |
91 Dwellings or More | 2 | 2 |
All Other Uses | ||
Less than 5 Acres | 1 | 1 |
5 Acres or More | 2 | 2 |
Standalone apartment complexes which consist of a single building
and independent of the number of dwelling units
, shall require a minimum of one point of vehicular and pedestrian access.
The requirements for vehicular and pedestrian access points required in 12.2.4 shall not apply to Design Districts, see Sec. 16.4, Streetscape
, Right-of-Way
, and Block
/Lot Standards.
Within any proposed development
, the proposed street layout shall be coordinated with the existing and planned street system of the surrounding area, with respect to location, alignment, and cross-section. Street design shall satisfy the minimum requirements of the City Public Works Director, City Transportation, NCDOT, or applicable designees.
1. A proposed right-of-way
shall be of sufficient width to accommodate the required cross section of the roadway. In no case shall the proposed right-of-way
be less than the currently adopted standards by the City or NCDOT, as applicable.
2. Right-of-way
shall be dedicated
and/or reserved
and improvements installed to City or NCDOT standards for each class of street as follows:
The entire right-of-way
shall be reserved
for future acquisition and improvement by the public.
(1) New Streets
The right-of-way
required to accommodate the proposed development
shall be dedicated
, with the remainder reserved
. The applicant shall be required to install improvements sufficient to service traffic demands of proposed development
.
(2) Existing Streets
The applicant shall dedicate
or reserve
additional right-of-way
and install improvements as required to serve proposed development
. Other improvements shall be installed according to the City Public Works Reference Guide for Development
or NCDOT standards, as applicable.
3. Right-of-way
dedication
shall be for the purposes of conformance to adopted plans or for the accommodation of other public purposes such as but not limited to streets, sidewalks, bicycle facilities, and utilities. Dedication
of right-of-way
that does not satisfy, or aid in satisfying, an identified public purpose shall not be shown or approved on any applicable site plan
or plat
.
Proposed streets shall be designed in accordance with the standards and specifications of the City Public Works Department or NCDOT, as applicable.
1. Street intersections shall be as nearly at right angles as possible with no intersection angle less than the minimum established by the City Transportation Department or NCDOT, as applicable.
2. Offset intersections shall only be allowed on streets which cannot be aligned, and shall be separated by a minimum distance determined by the City Transportation Department or NCDOT, as applicable, considering possible signalization, necessary storage, and sight distance, as well as other design constraints.
3. Adequate sight distances shall be provided at all intersections between streets and at driveway
intersections with streets.
4. Property lines at corners of all intersecting streets shall, as a minimum, be established as the hypotenuse of a triangle with each leg having a length of at least 20 feet or as required by the City Transportation Department or NCDOT along both street rights-of-way.
At intersecting streets, a sight triangle shall be established. The sight triangle shall be formed by connecting two points along the pavement edges or the extended lines of the pavement edges, 25 feet from where those extended lines meet.

For any driveway
, a sight triangle measuring ten feet from the back of curb and extending 70 feet from the edge of each side of the driveway
shall be required.

Within the sight triangle, no materials which would impede traffic visibility shall be allowed. Structures, fences and plant materials that extend into the sight triangle between two and one half feet and eight feet in height, as measured from the grade
of the street or drive, shall not be allowed.
Alternative dimensions shall be approved by the City Transportation Director or designee if the proposed dimensions will function as adequately as or better than standard Ordinance dimensions. The alternative dimensions shall be sealed by a qualified design professional, and designed utilizing the following criteria based upon industry standards such as, but not limited to, A Policy on Geometric Design of Highways and Streets by the American Association of State Highway and Transportation Officials (commonly known as the AASHTO green book); Traffic Engineering Handbook by the Institute of Transportation Engineers; or Roundabouts: An Informational Guide by the U.S. Department of Transportation Federal Highway Administration.
a. Street width
;
b. Posted speed limits;
c. Stopping position;
d. Field obstructions
;
e. Horizontal and vertical curves;
f. Travel direction (one-way vs. two-way streets); and
g. Traffic control measures (signals, roundabouts, etc.).
Cul-de-sac
streets shall not be longer than 800 feet and shall be terminated by a circular right-of-way
having a minimum diameter of 92 feet or an approved alternative turnaround as determined by the City Transportation Director or NCDOT, or appropriate designees. The length of cul-de-sac
streets shall be measured from the centerline of the bulb to the edge of pavement at the nearest intersection.
1. Unless exempted below, stub outs
shall be required on each side (as defined by each of the cardinal directions) of a development
as follows:
Table 1 | |
|---|---|
Lineal Stub Out | Applicable Zoning Districts |
At least one stub out | RU-M, RC (20 max); RS-M(D) (18 max); PDR (above 8.000); CSD; MU; CD; DD; CI; CN |
At least one stub out | RU-5 (8 max); RS-M (8 max); RS-8 (5 max); PDR (below 8); OI; CG; CC |
At least one stub out | RR; RS-20 (2 max); RS-10 (4 max); I; IL; IP; SRP; UC |
a. Adjacent
existing development
has not made any accommodation for such connections; or
b. Adjacent
sites are permanently protected from development
through conservation easements
or ownership that precludes development
; or
c. The only point of access would require crossing floodplains, steep slopes, or other similar natural features; or
d. The existing street pattern in the area of the proposed development
already provides for vehicular connections at intervals no greater than one-half mile apart in the Rural Tier, one-quarter mile apart in the Suburban Tier, or one-fifth mile apart in the Urban Tier.
The proposed street layout in new development
shall be coordinated with the existing street system with connections made at all stub outs
. Stub outs shall be built to the edge of the site.
a. Alternatives to building
to the edge of the site are allowed per the following:
(1) A determination is made by NCDEQ that prevents the full construction of the stub, in which case the stub shall be constructed to the extent allowed by NCDEQ. The following shall also be required:
(a) A payment-in-lieu for the remainder of the stub out
shall be provided pursuant to the requirements of the City’s Reference Guide for Development
.
(b) Construction and slope easements
, and the right-of-way
required to build the stub out
, shall be dedicated
.
(2) Any other request to modify this requirement will require a variance
for the minimum modification necessary to provide relief, per Sec. 3.16, Variance
. If a variance
is approved, the following shall also be required:
(a) A payment in lieu of construction shall be required pursuant to the requirements of the City’s Reference Guide for Development
.
(b) Construction and slope easements
, and the right-of-way
required to build the stub out
, shall be dedicated
.
b. Where no full connection can be made as a result of the topography of the site being developed
, the developer
shall install a cul-de-sac
bulb or other turnout facility at the stub out
constructed according to the City of Durham Reference Guide for Development
..
A four square foot sign
that reads “Future Street Connection” shall be place at the center of the terminus of the street stub, facing oncoming traffic, and measuring five to six feet in height from the ground. The sign
shall comply with any applicable City of Durham Department of Transportation, NCDOT, and MUTCD standards.
Alleys
shall be permitted and designed in accordance with design criteria established by the City or NCDOT, as applicable.
The reservation
of private property strips of too narrow a depth to permit development
as a means of controlling access to public ways shall not be permitted.
Where a development
abuts or contains a controlled or limited access right-of-way
, whether existing or proposed, an access street or frontage road
shall be required.
1. The provisions of this section shall apply to the initial naming and renaming pursuant to Sec. 3.25, Street Naming and Renaming.
2. Extensions of existing, named streets shall bear the existing street name.
3. Except for the naming or renaming of a street or right-of-way
with a full or proper name, the Planning Director or designee, in consultation with the Durham Emergency Communications Center, shall be the approving authority for initial street names, or as provided by NCDOT procedures for right-of-way
under NCDOT control.
a. Except for a full or proper name, the initial naming of a right-of-way
or driveway
, as allowed in this section, shall be reviewed for approval on a final plat
.
b. Approval of a full or proper name street name shall require approval by the applicable governing body, and NCDOT if applicable.
c. Approval of a street renaming shall be pursuant to Sec. 3.25, Street Naming and Renaming.
A street name shall be established for a public street or a private street.
A street name can be established for a driveway
allowed for access within a townhouse
or detached rowhouse development
under paragraph 12.2.2B.2.b. above, and for a pedestrian mall
under paragraph 16.4.3C, Pedestrian Malls
. Establishing a name shall not result in circumventing development
requirements for private streets, sidewalks, street trees, or other items.
The following rules shall apply for approval of any new street name.
1. Names submitted for approval of a new development
shall be limited to only the number of names needed for the development
. No extra names shall be reserved
for future applications.
2. Names shall only be used for the project for which they were approved and shall not be used for other locations or projects.
3. Approval of names includes the approval of the spelling. A variation from the approved spelling shall not be allowed.
4. Each street name shall consist of at least two parts: the primary name and the street suffix type. The approval of the street suffix is part of the street name approval. Street suffixes shall only be from the official USPS list.
5. A street suffix shall not be part of, or come before, a primary name.
Commentary: For example, “LEAFY DRIVE ROAD
” would not be approved because “Drive” is a suffix used as a part of the primary name. “AVENUE OF AMERICAS” places the suffix before the primary name, and is therefore not approvable.
a. Names shall not duplicate, or approximate or vary, an existing name in spelling or pronunciation.
Commentary: For example, “MAIN STREET” is an existing name, therefore “MANE STREET,” “MAINE STREET,” and “MAIN DRIVE” would not be approved.
b. The prohibition on duplicate or approximate names shall apply to a component of a name.
Commentary: For example, OAKS DRIVE, OAK RIDGE DRIVE, and OAK PLEASANT DRIVE all contain “Oak” as the primary name or a component of the primary name.
c. Words or names which are difficult to pronounce, and words in which the pronunciation is different than spelling, and therefore may cause confusion for citizens, users, and service providers, shall not be used.
d. Full names or proper names shall only be approved by the applicable governing body.
7. Cardinal directions shall not be used in a manner that is inconsistent with the current addressing system, or in a manner that would cause confusion.
Commentary: For example, EAST APPALACHIA DRIVE would not be approved if there were no corresponding WEST/NORTH/SOUTH APPALACHIA DRIVE. Additionally, a directional name will not be approved as a standalone name in a location that is contrary to the directional portion of the name. For example, NORTH COAST ROAD
would not be appropriate along the south shores of Jordan Lake.
a. Numbers, spelled out or symbolized, shall not be used in the street name.
b. Abbreviations or acronyms shall not be used in the street name.
c. Special characters such as hyphens, symbols, apostrophes or other punctuation, or signs
shall not be used as characters in the street name.
d. Extensions or conjunctions shall not be used in the street name.
e. The maximum length for street names shall be twenty characters.
A. Standard street name signs
shall be installed at one corner of all street intersections, including private streets and named driveways
allowed for access within townhouse
or detached rowhouse developments
under paragraph 12.2.2B.2.b above. The size, design, materials, location, fabrication, installation, and maintenance of the signs
and poles within the public right-of-way
and elsewhere shall be in accordance with City Transportation Department or NCDOT standards, as applicable. The developer
or owner
of a private street or a common area in which a named driveway
is located shall be responsible for permanent maintenance as well as fabrication and installation.
B. Signs
denoting the beginning and ending of public maintenance shall also be erected and maintained on private streets and shall be required on named driveways
allowed for access within townhouse
or detached rowhouse developments
under paragraph 12.2.2B.2.b above that intersect with the public right-of-way
. All such signs
shall conform to the street name sign
requirements of paragraph A above.
C. Signs
denoting the right-of-way
boundaries of dedicated
or reserved
, unopened streets shall be erected and maintained according to City or County standards.
Street lighting, as required for traffic safety and property security, shall be installed in conformance with City Transportation Department or NCDOT policies, as applicable. The design, materials, location, and installation shall conform to all applicable City Transportation Department or NCDOT standards, and applicable public utility
standards, including appropriate separation from street trees.
A. Sidewalk, walkway, on-road improvements, and trail systems sufficient to serve both existing and projected pedestrian and cyclist needs shall be labeled on all site and subdivision
plans. Such systems shall be designed to connect with all elements within the development
, adjacent
areas, and transit stops and can include sidewalks along public or private streets, wide outside travel lanes, bike lanes on roadways, and walkways and trails in alternative locations as appropriate. Design, location, dimensions, dedications
, easements
, and reservations
shall conform to applicable City and County policies and plans for sidewalks, bicycle routes, and trails.
B. Walkways and trails shall be designed to maximize the safety of users and the security of adjoining properties with respect to location, visibility, and landscaping.
A. A sidewalk shall be provided along public or private right-of-way
as shown in the table below.
Street Type | Rural Tier | All Other Tiers |
|---|---|---|
None | None | |
All other streets | None | Both Sides |
B. Preliminary and minor plats
, and developments
required to improve existing right-of-way
to City or NCDOT standards, as applicable, shall provide public sidewalk within right-of-way
pursuant to paragraph 12.4.2A, Sidewalk Requirement.
C. For all other development
except as exempted pursuant to paragraph 12.4.2D, Exemptions, required sidewalk along the right-of-way
frontage of the development
site shall be provided, as applicable per paragraph 12.4.2A, through only one of the following two methods. The following methods shall not be used in combination:
a. Sidewalk shall connect to external sidewalks that extend to the property of the subject development
, including connectivity to crosswalks and end of pavement at all adjacent
intersections.
b. Sidewalk located on-site shall meet the following criteria:
(1) The sidewalks shall be located within a public access easement
;
(2) The maximum distance from the right-of-way
, measured to the closest edge of the sidewalk to the right-of-way
, shall be 20 feet; and
(3) Lighting per Sec. 7.4, Outdoor Lighting, shall be provided either by proposed or existing on-site lighting, or street lights within the right-of-way
.
a. Payment-in-lieu of constructing required sidewalk shall be made at the rate set by the City Council.
b. In order to accommodate future sidewalk, a recorded easement
shall be provided along frontage of the subject property where no sidewalk is proposed if the existing right-of-way
is not of sufficient width to accommodate a sidewalk.
c. Payment-in-lieu shall not remove the requirement of sidewalk per paragraph 12.4.2A for future development
projects, unless exempt per paragraph 12.4.2D, Exemptions.
The following shall be exempt from the installation of public sidewalk:
1. Sidewalk shall not be required when development
submittals consist of only the following:
a. Improvements consist only of unmanned facilities of less than 1,000 square feet, such as storage rooms, mechanical equipment, coolers, or stand-alone ice kiosks;
b. Additional motor vehicle
parking consisting of less than four spaces;
c. Additions of less than 1,000 square feet of building
area;
d. Improvements that are documented to solely bring existing facilities up to current health, safety, or building
code requirements;
e. Grading
and/or utility improvements; or
f. Only requires review by the Planning Department.
2. Public sidewalk shall not be required when documentation is provided that sidewalk will be provided, through a scheduled and funded City or State roadway project, along the location where sidewalk would otherwise be required.
3. Sidewalk shall not be required along unimproved right-of-way
that is not required to be improved as part of the development
project.
1. Alternative pedestrian plans that are valid as of June 1, 2013, except for those approved pursuant to previous UC District requirements, shall remain valid and can develop
sidewalks and/or walkways pursuant to the plan in lieu of sidewalk requirements of this section.
a. If aspects of sidewalk development
are not addressed within the plan, Ordinance requirements shall apply.
b. Plans shall be updated every four years from the date of previous approval to maintain validity, demonstrating areas of completed sidewalks and/or walkways of the plan.
2. Pedestrian plans approved pursuant to previous UC District requirements shall no longer be valid.
1. Sidewalk shall be provided along both sides of public or private right-of-way
.
2. Along right-of-way
with curb and gutter located internal to the development
, sidewalk can be provided at the back-of-curb.
3. Sidewalks and other walkways internal to the SRP-C District can be constructed with any all-weather surface material as long as it meets accessibility standards and, if applicable, meets NCDOT standards.
A. Pedestrian and bicycle facilities shall be clearly marked using NCDOT standard markings, or shall be based on the Manual on Uniform Traffic Control Devices.
B. Adjacent
public greenways shall be connected to pedestrian and bicycle facilities on the site.
C. Pedestrian and bicycle connections shall be made to any existing or proposed off-site pedestrian, bicycle, and transit facilities.
1. Walkways shall be provided to satisfy paragraph 12.4.1, General. Additionally, walkways shall be provided along common access driveways
and areas that serve as ingress/egress for the development
site pursuant to paragraph 12.2.2B.2.b, Driveways
, as follows:
a. A walkway shall be placed along both sides of the driveway
or area.
b. The walkway shall be located no more than five feet from the edge of driveway
or area.
c. Driveways
and areas that solely serve as access for rear-loaded townhouses
or detached rowhouses or loading areas
for nonresidential buildings shall not require walkways.
2. The minimum width of internal walkways shall be four feet, or as required by the State accessibility code, whichever is greater.
3. Walkways shall be constructed of an all-weather solid surface material such as concrete, asphalt, or another similar material that would satisfy the State accessibility code.
1. In right-of-way
with curb and gutter, sidewalks shall be a minimum of five feet in width with a minimum three-foot grass strip between the sidewalk and curb, unless otherwise specified in this Ordinance.
a. A wider grass strip or planting area shall be required as necessary to accommodate street trees planted within rights-of-way.
b. Alternative widths can be allowed if permitted pursuant to development
guidelines maintained by the City Public Works Director, or NCDOT, as applicable.
2. Conventional sidewalks shall be constructed of concrete unless an alternate material is approved by the City Public Works Director, or Designee.
3. Along strip-paved roads
sidewalks shall be located behind the roadside ditch or guardrail.
Either wide outside travel lanes or bicycle lanes, as determined by the City Transportation Director or NCDOT, or appropriate designees, shall be a part of any road
improvement made on roadways which are indicated as bicycle routes on the Durham Trails and Greenways Master Plan, the Metropolitan Planning Organization's Transportation Plan, or other adopted bicycle plan.
Rather than utilize separate pedestrian and bicycle facilities, shared facilities with a 10 foot minimum width are allowed in any area where both sidewalks and bicycle facilities are required, unless separate facilities have been previously developed
or approved in the area. Shared facilities of that same width shall be required, however, following the initial installation of shared facilities in the area.
Pedestrians and bicycles shall be accommodated as shown in the table below. All street design standards shall be established by the City Transportation Director or NCDOT, or appropriate designees.
Standard | Rural Tier | Suburban Tier | Urban Tier | Compact Neighborhood/ Downtown Tiers |
|---|---|---|---|---|
PEDESTRIAN FACILITIES | ||||
Public sidewalk, 5 feet minimum, all roadways (see paragraph 12.4.2, Sidewalk Requirement) | No | Yes | Yes | Yes |
Pedestrian crossing treatment at intersections (marked crosswalk, bulb-out, hot button etc.) | No | Yes | Yes | Yes |
Pedestrian routes in parking areas protected from vehicular traffic | No | Yes | Yes | Yes |
BICYCLE FACILITIES | ||||
Bike lanes on all boulevards and thoroughfares, either 4-foot minimum width striped outside gutter edge or 14-foot outside lanes, determined on a case-by-case basis | Yes | Yes | Yes | Yes |
1. The applicant for a residential development
shall be responsible for either:
a. Dedicating
1,150 square feet of land for recreation purposes (including active and passive recreation
areas, including trails) for each proposed dwelling unit
; or
b. Making payment-in-lieu equivalent to the tax value of 1,150 square feet of comparable property per dwelling unit
.
2. One of the following shall be required:
a. Dedication
of land; or
b. Payment-in-lieu of dedication
.
1. The applicant for a residential development
shall be responsible for:
a. Paying a recreation impact fee or dedicating
575 square feet of land for parks and active recreation
areas for each proposed dwelling unit
; and
b. Paying a resource based recreation impact fee or dedicating
575 square feet of land for passive recreation
areas (including trails) for each proposed dwelling unit
.
2. Where recreation service districts have been established, payments made under this section shall be expended within the respective district from which collected.
3. The following, individually or in combination, shall be required based upon jurisdiction and whether the development
is located on the Durham Trails and Greenways Master Plan or the Durham Comprehensive Bicycle Transportation Plan:
a. Payment of an impact fee;
b. Dedication
of land; or
c. Payment-in-lieu of dedication
.
Proposed additions to public systems shall be coordinated with the existing systems and shall satisfy the design and construction standards and specifications of the utility providing the services. Where not otherwise prohibited by local ordinance, community systems, or systems designed to serve more than one user independent of public systems, shall satisfy the standards of the applicable agency
responsible for approval.
Installation of improvements which are extensions to existing public systems shall be approved by the public utility
providing the services. Sanitary sewer systems may be extended into the Rural Tier in the following instances:
1. In the County jurisdiction, and within the City jurisdiction where no State approval has been issued, approval of a major special use permit pursuant to Sec. 3.9, Special Use Permit, provided that:
a. Pump stations are equipped with battery-backed alarm systems connected by an automatic dialer to a 24-hour maintenance service; and
b. Provision is made for connection to a portable generator.
2. To serve an existing use or structure
for which a health hazard has been documented by the County health department or the State of North Carolina.
The additional requirements of paragraph 8.7.2, General Requirements shall apply in watershed
protection overlays.
Community systems designed to serve more than one user independent of public systems shall be allowed if approved by the State of North Carolina.
Soils evaluation by a qualified soil scientist, early in the approval process, is recommended where the use of individual on-site wastewater disposal
systems is anticipated.
A. Any land-disturbing activity may be required to provide stormwater
management facilities or make other improvements to the existing drainage system to address water quantity concerns, water quality concerns, or both if the proposed development
will increase potential flood damages to existing properties or significantly increase pollutant levels in downstream receiving waters.
B. Stormwater
management facilities adequate to accommodate a ten-year or greater storm shall be provided that generally follow existing natural drainage systems. Piping and modification of streams
and other natural water courses should be minimized and shall be considered on a case-by-case basis to determine if it is necessary and environmentally sound. Such facilities shall be designed, constructed and maintained to minimize flooding, protect downslope properties, preserve water quality, and adequately transport existing and projected stormwater
flows.
C. Development
plans, site plans
, and preliminary plats
shall require a stormwater
impact analysis that complies with the requirements of the City Public Works Director or County Engineer, or appropriate designees, and which determines the impact of the increased stormwater runoff
on downstream stormwater
facilities and properties.
D. The need for stormwater
management facilities to address offsite impacts shall be determined by the City Public Works Director or County Engineer, or their designees, as appropriate.
City stormwater
facilities shall be regulated pursuant to the applicable City code.
County stormwater
facilities shall be regulated pursuant to the applicable County code.
A. The applicant shall arrange for the coordinated installation of all other proposed utilities, including gas, electricity, and communications improvements, and shall ensure that site plans
, preliminary plats
, and final plats
clearly show all related easements
and right-of-way
.
B. Utilities shall be installed underground for any subdivision
requiring preliminary plat
approval, except as follows:
1. Where electric transmission lines cannot be installed underground.
2. Electric transmission lines are located outside of the boundary of the development
site and are existing above ground at time of application, even if subsequently relocated as part of the development
.
A. This Section is adopted for the purposes of:
1. Regulating private, non-exempt land-disturbing activity to control accelerated erosion
and sedimentation
in order to prevent the pollution of water and other damage to lakes, watercourses
and other public and private property by sedimentation
; and
2. Establishing procedures through which these purposes can be fulfilled.
B. No person
shall undertake any land-disturbing activity without first obtaining a permit from the Sedimentation
and Erosion
Control Officer
or designee as required by this section.
The following activities do not require a permit under this section:
1. Land-disturbing activities for the purpose of fighting fires;
2. Land-disturbing activities that are less than 12,000 square feet in surface area. In determining the area, lands under one or diverse ownership being developed
as a unit will be aggregated. Notwithstanding this provision, an erosion control plan
and/or permit may be required by the Sedimentation
and Erosion
Control Officer
or designee when off-site damage is occurring, or if the potential for off-site damage exists. Additionally, this section may apply when the applicant, or a parent
, subsidiary
, or other affiliate
of the applicant has engaged in any activity enumerated in paragraph 3.8.7, Disapproval of Plan;
As set forth in NCGS § 113A-52.01, land-disturbing activities relating or incidental to the production of crops
, grains, fruits, vegetables, ornamental and flowering plants, dairy, livestock
, poultry, and all other forms of agriculture undertaken
on agricultural land for the production of plants and animals useful to man, including but not limited to:
a. Forage and sod crops
, grain and feed crops
, tobacco, cotton and peanuts;
b. Dairy animals and dairy products;
c. Poultry and poultry products;
d. Livestock
, including beef cattle, llamas, sheep, swine, horses, ponies, mules or goats, including the breeding and grazing of any or all such animals;
e. Bees and apiary products;
f. Fur animals; and
g. Mulch, ornamental plants, and other horticultural products. For purposes of this section, “mulch” means substances composed primarily of plant remains or mixtures of such substances;
4. Land-disturbing activities undertaken
on forest land for the production and harvesting of timber and timber products and which are conducted in accordance with best management practices set out in Forest Practice Guidelines Related to Water Quality, as adopted by the North Carolina Department of Agriculture and Consumer Services. If land-disturbing activity undertaken
on forestland for the production and harvesting of timber and timber products is not conducted in accordance with Forest Practice Guidelines Related to Water Quality, the provisions of this Article shall apply to such activity and any related land-disturbing activity;
5. Land-disturbing activities undertaken
by persons
as defined in NCGS § 113A-52(8) who are otherwise regulated by the provisions of the Mining
Act of 1971, NCGS § 74-46 – 74-68;
6. Land-disturbing activities over which the state has exclusive regulatory jurisdiction as provided in NCGS § 113A-56(a);
7. Land-disturbing activities undertaken
for the duration of an emergency, activities essential to protect human life;
8. Activities undertaken
to restore the wetland
functions of converted wetlands
to provide compensatory mitigation to offset impacts permitted under Section 404 of the Clean Water Act; and
9. Activities undertaken
pursuant to Natural Resources Conservation Service standards to restore the wetlands
functions of converted wetlands
as defined in Title 7 Code of Federal Regulations Sec. 12.2 (January 1, 2014 Edition).
Subject to the exemptions listed in subsection 12.10.2, a sedimentation
and erosion control plan
shall be required for any land-disturbing activity within the County, including the City, if more than 20,000 aggregate square feet will be disturbed, or if 12,000 or more aggregate square feet will be disturbed in a M/LR-A, M/LR-B, F/J-A, E-A, or E-A(2) watershed
protection overlay district. The Sedimentation
and Erosion
Control Officer
or designee may also require a plan for any land-disturbing activity if it determines that off-site damage is occurring or the potential for off-site damage exists. A plan may also be required when the applicant, or a parent
, subsidiary
, or other affiliate
of the applicant, has engaged in any activity listed in paragraph 3.8.7, Disapproval of Plan.
| Less than 12,000 s.f. | 12,000 s.f. to | More than 20,000 s.f. |
|---|---|---|---|
Plan | MR | MR(*R) | R |
Permit | MR | R | R |
MR – May be required when off-site damage is occurring, the potential for off-site damage exists, or if the applicant or a parent R – Required. *R – Required in a Lake Michie/Little River Critical Area (M/LR-A), Lake Michie/Little River Protected Area (M/LR-B), Falls/Jordan Critical Area (F/J-A) and Eno River Critical Areas (E-A; E-A(2)). | |||
Persons
conducting land-disturbing activity shall take all reasonable measures to protect all public and private property from damage caused by such activity.
Whenever conflicts exist between federal, State or local laws, ordinances or rules, the more restrictive provision shall apply.
In order for a sedimentation
and erosion control plan
to be approved, the following control objectives shall be met:
On-site areas which are subject to severe erosion
, and off-site areas which are especially vulnerable to damage from erosion
and/or sedimentation
, are to be identified and receive special attention;
All land-disturbing activity is to be planned and conducted to limit exposure to the shortest feasible time;
All land-disturbing activity is to be planned and conducted to minimize the size of the area to be exposed at any one time;
Surface water runoff
originating upgrade of exposed areas shall be controlled to reduce erosion
and sediment
loss during the period of exposure;
All land-disturbing activity is to be planned and conducted so as to restrain off-site sedimentation
damage; and
When the increase in the velocity of stormwater runoff
resulting from a land-disturbing activity is sufficient to cause accelerated erosion
of the receiving watercourse
, plans are to include measures to control the velocity at the point of discharge so as to minimize accelerated erosion
of the site and increased sedimentation
of the stream
.
No land-disturbing activity shall occur except in accordance with the mandatory standards listed below. Except where more stringent standards are specified in this Ordinance, the technical standards and specifications contained in the North Carolina Erosion
and Sediment
Control Planning and Design Manual shall also apply. In addition, for land-disturbing activities greater than or equal to one acre, requirements within the most recent version of the State of North Carolina General Permit No. NCG010000 shall apply.
Except where more stringent buffer
requirements are specified in Article 8, Environmental Protection, and/or Article 9, Landscaping and Buffering, the following requirements shall apply;
1. No land-disturbing activity during periods of construction or improvement to land shall be permitted in proximity to a lake or natural watercourse
unless a buffer zone
is provided along the margin of the watercourse
of sufficient width to confine visible siltation
within the 25% of the buffer zone
nearest the land-disturbing activity. This subsection shall not apply to a land-disturbing activity in connection with the construction of facilities to be located on, over or under a lake or natural watercourse
; and
2. Unless otherwise provided, the width of a buffer zone
is measured from the top of the bank nearest edge of the disturbed area, with the 25% of the strip nearer the land-disturbing activity containing natural or artificial means of confining visible siltation
.
3. Two rows of silt fence shall be placed along all buffer
zones. Rows should be spaced a minimum of three (3) feet apart.
The angle for disturbed land shall be no greater than the angle which can be retained by vegetative cover or other adequate erosion
control devices or structures.
Land left exposed shall be planted or otherwise provided with temporary ground cover
, devices, or structures sufficient to restrain erosion
within the applicable time period after completion of any phase of grading
or period of inactivity as follows: seven days for a steep slope; 10 days for a moderate slope; 14 days for land with no slope or inclination. For purposes of this section, a moderate slope means an inclined area, the inclination of which is less than or equal to three units of horizontal distance to one unit of vertical distance; and a steep slope means an inclined area, the inclination of which is greater than three units of horizontal distance to one unit of vertical distance. No other criteria apply.
Commentary: The moderate and steep slope definitions in this section are mandated by State law (S.L. 2009-486) for sedimentation
and erosion
control purposes. This steep slope definition differs from the steep slope definition under UDO Sec. 8.8, Steep Slope Protection Standards, which is otherwise applicable throughout the UDO.
Soil stockpiles shall be limited to the shorter of 30 feet above existing grade
or half the height of adjacent
existing mature tree cover. Stockpiles shall be wrapped in two rows of silt fence, and groundcover shall be planted in accordance with this section. Stockpile slopes shall be 2:1 or flatter.
For any area of land-disturbing activity where grading
activities have been completed, temporary or permanent ground cover
sufficient to restrain erosion
shall be provided as soon as practicable, but in no case later than seven days after completion of grading
.
Whenever land-disturbing activity exceeds 12,000 square feet, the person
conducting the land-disturbing activity shall install such sedimentation
and erosion
control devices and practices as are sufficient to retain the sediment
generated by the land-disturbing activity within the boundaries of the tract
during construction upon and development
of such tract
, and shall plant or otherwise provide a temporary ground cover
sufficient to restrain erosion
generated by such devices and practices within seven days.
D. Erosion
and sedimentation
control measures, structures and devices shall be so planned, designed and constructed as to provide protection from the calculated maximum peak of runoff
from the 25-year storm. Runoff
rates shall be calculated using the procedures in the USDA, Soil Conservation Service's "National Engineering Field Manual for Conservation Practices," or other calculation procedures acceptable to the Sedimentation
and Erosion
Control Officer
or designee.
E. Each sediment
basin or trap in the Suburban or Rural Tier shall have a minimum volume of 3,600 cubic feet per acre of disturbed area and a minimum surface area of 435 square feet per cfs of Q25 (25-year storm) peak inflow. Each sediment
basin or trap in the Downtown, Compact Neighborhood, or Urban Tier shall have a minimum volume of 1,800 cubic feet per acre of disturbed area and a minimum surface area of 325 square feet per cfs of Q25 peak inflow. A skimmer shall be used in each sediment
basin or trap. If the temporary sediment
basin or trap is to be converted to a permanent stormwater
control measure and the volume is greater than that of the temporary basin, the larger of the two shall be used, unless approved in writing by the Durham County Erosion
Control Office
.
F. Sediment
basins and traps shall be designed and constructed such that the basin will have a settling efficiency of at least 70% for the 40-micron (0.04mm) size soil particle transported into the basin by the runoff
of that two-year storm that produces
the maximum peak rate of runoff
as calculated according to procedures in the United States Department of Agriculture Soil Conservation Service's "National Engineering Field Manual for Conservation Practices" or according to procedures adopted by any other agency
of the State or the United States or any generally recognized organization or association.
G. Sediment
basins and traps shall not be installed in perennial or intermittent streams
.
H. Existing ponds and lakes shall not be used as sediment
basins or traps.
I. Developer
shall retain control of permitted area, including sediment
basins or traps, until permit has been closed. For commercial sites, sold outparcels
shall be permitted separately.
J. Newly constructed open channels shall be designed and constructed with side slopes no steeper than two horizontal to one vertical if a vegetative cover is used for stabilization, unless soil conditions permit steeper slopes or where the slopes are stabilized by using mechanical devices, structural devices or other acceptable ditch liners. In any event, the angle for side slopes shall be sufficient to restrain accelerated erosion
.
K. Additional areas may be added per the criteria enumerated in this section only if the basin or trap is properly installed and maintained.
L. In high quality water HQW zones
es, Lake Michie/Little River Critical Area (M/LR-A), Lake Michie/Little River Protected Area (M/LR-B), Falls/Jordan Critical Area (F/J-A), Eno River Critical Areas (E-A; E-A(2)), and Third Fork Creek Watershed
, uncovered
areas shall be limited at any time to a maximum total area of 20 acres. In high quality water HQW zones
es, only the portion of the land-disturbing activity within a HQW zone shall be governed by this section. Larger areas within HQW may be uncovered
with the written approval of the Director of DEQ, Division of Energy, Mineral and Land Resources. Larger areas within all other zones may be uncovered
with the written approval of the Durham County Erosion
Control Office
.
Triassic soils do not respond as well to conventional erosion
control measures as listed within this ordinance and projects with underlying Triassic soils are thus subject to the following additional requirements:
1. Flocculants shall be used onsite in accordance with the requirements of Section 12.10.4N.
2. Sediment
basins and traps shall have a minimum volume of 5,400 cubic feet per acre of disturbed area and shall be designed so as to dewater in a minimum of 4 days.
3. Moderate and steep slopes shall be stabilized by either matting or hydroseeding in order to more rapidly provide groundcover.
Flocculants are chemicals that can cause fine particles to combine and settle in detained runoff
. When used in conjunction with sediment
basins or traps, they can reduce sediment
in discharge leaving a site. The use of flocculants, where not required by Section 12.10.4M, is recommended in land disturbing activity
. When used, the following requirements apply:
1. A flocculant application plan shall be included on the erosion control plan
, including:
a. Type of Flocculant to be used including manufacturer and supplier;
b. Site-specific dosing systems;
c. Location(s) of flocculant application; and
d. Identification of the individual and/or position responsible for dosing and monitoring of flocculant usage.
2. Soil samples should be obtained from areas where flocculants will be used, and samples should be screened
using jar tests with multiple flocculants to select the appropriate flocculant. Jar testing can be performed by the contractor
or flocculant supplier.
3. Only flocculants listed on the NCDEQ website as an approved product for use in North Carolina shall be used.
4. Flocculant applied in solid form should be evaluated and re-applied if needed after every rainfall event that is equal to or exceeds 0.5 inches.
5. Flocculants shall not be applied directly to surface waters.
6. Flocculants shall be applied upstream of a sediment
basin, trap, or other pooling device such as silt fence.
7. The use of flocculants does not alter the requirements for site stabilization. Sites should be stabilized as soon as possible using conventional methods to minimize the need to use flocculants.
Commentary: Additional information on the use of chemical treatment of construction site stormwater
can be found at: https://cals.ncsu.edu/crop-and-soil-sciences/extension/publications/ (scroll down from top to find Erosion
, Sediment
, and Turbidity Control section).
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.
The land-disturbing activity shall be planned and conducted such that the velocity of stormwater runoff
in the receiving watercourse
at the point of discharge resulting from a 25-year storm after development
shall not exceed the greater of:
1. The velocity specified according to the soil type in the following table, for a point of discharge into a receiving watercourse
with bare soil or rock banks or bed;
Materials | Maximum Permissible Velocities | ||
|---|---|---|---|
Name | Description | FPS1 | MPS2 |
Fine Sand (noncolloidal) | Cecil fine sandy loam, Pinkston fine sandy loam | 2.5 | 0.8 |
Sand Loam (noncolloidal) | Appling sandy loam, Creedmoor sandy loam, Helena sandy loam, Mayodan sandy loam, Wedowee sandy loam, Wilkes sandy loam, White shore sandy loam | 2.5 | 0.8 |
Silt Loam (noncolloidal) | Georgeville silt loam, Herndon silt loam, Lignum silt loam, Roanoke silt loam | 3.0 | 0.9 |
Ordinary Firm Loam | Iredell loam, Mecklenburg loam, Wahee loam, Davidson clay loam, White Store clay loam-eroded | 3.5 | 1.1 |
Fine Gravel |
| 5.0 | 1.5 |
Stiff Clay (very colloidal) | Iredell-Urban land complex, White Store-Urban land complex, Mayodan-Urban land complex | 5.0 | 1.5 |
Graded | Tatum gravelly silt loam, Nason stony silt loam, Goldston slaty (channery) silt loam | 5.0 | 1.5 |
Graded |
| 5.5 | 1.7 |
Alluvial Silts (noncolloidal) | Wehadkee silt loam, Congaree silt loam, Chewacla silt loam, Cartecay silt loam | 3.5 | 1.1 |
Alluvial Silts (colloidal) |
| 5.0 | 1.5 |
Coarse Gravel (noncolloidal) |
| 6.0 | 1.8 |
Cobbles and shingles |
| 5.5 | 1.7 |
Shales and Hard Pans |
| 6.0 | 1.8 |
1 FPS: Feet per second 2 MPS: Meters per second | |||
2. The velocity specified according to the type of vegetation and depth of flow in the following table, for a point of discharge into a vegetated receiving watercourse
; or
Vegetatively Protected Watercourses | |||
|---|---|---|---|
Group No. | Vegetation | Depth of | Maximum Permissible Velocity |
1 | Bermudagrass | up to 1 greater than 1 | 4 6 |
2 | Reed canarygrass; Kentucky bluegrass | up to 1 greater than 1 | 3 6 |
3 | Grass and legumes, mixed; Weeping lovegrass | up to 1 greater than 1 | 3 4 |
4 | Annuals: Annual lespedeza (KOBE); Sudangrass Small grain: (Rye, Oats, barley); Ryegrass | up to 1 greater than 1 | 2.5 2.5 |
Notes Do not use vegetative protection on longitudinal parallel to flow slopes steeper than 10% except for side slopes. Annuals: use only as temporary protection until permanent cover is established. | |||
3. The velocity in the receiving watercourse
determined for the ten-year storm
prior to development
.
C. If the conditions enumerated in paragraph B, Performance Standard, of this subsection cannot be met, the channel below the discharge point
shall be designed and constructed to withstand the expected velocity.
When soils with slopes as indicated in the following table, occur between a point of stormwater
discharge and the next confluence of concentrated stormwater runoff
, such areas, on- or off-site, shall be protected from accelerated erosion
by diverting the stormwater
discharge from those soil surfaces. Diversion may include the provision of piped, paved or armored storm drainage facilities
.
Critical Soils of Durham County | ||
|---|---|---|
ApC | Appling sandy loam | 6-10% slopes |
CfC | Cecil fine sandy loam | 6-10% slopes |
CrC | Creedmoor sandy loam | 6-10% slopes |
DaD | Davidson clay loam | 6-10% slopes |
GeC | Georgeville silt loam | 6-10% slopes |
GeD | Georgeville silt loam | 10-15% slopes |
GIE | Goldston slaty silt loam | 10-25% slopes |
GIF | Goldston slaty silt loam | 25-45% slopes |
GrC | Granville sandy loam | 6-10% slopes |
Gu | Gullied land | Clayey materials |
HeC | Helena sandy loam | 6-10% slopes |
HrC | Herndon silt loam | 6-10% slopes |
HsC | Herndon stony silt loam | 2-10% slopes |
IrC | Iredell loam | 6-10% slopes |
IyC | Iredell-Urban land complex | 6-10% slopes |
MfC | Mayodan sandy loam | 6-10% slopes |
MfD | Mayodan sandy loam | 10-15% slopes |
MfE | Mayodan sandy loam | 15-25% slopes |
MrC | Mayodan-Urban land complex | 0-10% slopes |
MrD | Mayodan-Urban land complex | 10-15% slopes |
MuC | Mecklenburg loam | 6-10% slopes |
NaD | Nason silt loam | 10-15% slopes |
NaE | Nason silt loam | 15-25% slopes |
NoD | Nason stony silt loam | 10-15% slopes |
PfC | Pinkston fine sandy loam | 2-10% slopes |
PfE | Pinkston fine sandy loam | 10-25% slopes |
TaE | Tatum gravelly silt loam | 15-25% slopes |
Ur | Urban land |
|
WmD | Wedowee sandy loam | 10-25% slopes |
WmE | Wedowee sandy loam | 15-25% slopes |
WsC | White Store sandy loam | 6-10% slopes |
WsE | White Store sandy loam | 10-25% slopes |
WvC2 | White Store clay loam | 2-10 % slopes, eroded |
WvE2 | White Store clay loam | 10-25% slopes, eroded |
WwC | White Store-Urban land complex | 0-10% slopes |
WwE | White Store-Urban land complex | 10-25% slopes |
WxE | Wilkes sandy loam | 10-25% slopes |
Measures applied alone or in combination to satisfy the intent of this section are acceptable if there are no objectionable secondary consequences. The State Sedimentation
Control Commission recognizes that the management of stormwater runoff
to minimize or control downstream channel and bank erosion
is a developing
technology. Innovative techniques and ideas will be considered and may be used when shown to have the potential to produce
successful results. Some alternatives are to:
1. Avoid increases in surface runoff
volume and velocity by including measures to promote infiltration to compensate for increased runoff
from areas rendered impervious;
2. Avoid increases in stormwater
discharge velocities by using vegetated or roughened swales and waterways in lieu of closed drains and high velocity paved sections;
3. Provide energy dissipaters
at outlets of storm drainage facilities
to reduce flow velocities at the point of discharge. These may range from simple rip-rapped sections to complex structures; and
4. Protect watercourses
subject to accelerated erosion
by improving cross sections and/or providing erosion
-resistant lining.
This section shall not apply where it can be demonstrated, to the satisfaction of the Sedimentation
and Erosion
Control Officer
or designee that stormwater
discharge velocities will not create an erosion
problem in the receiving watercourses
.
When the person
conducting the land-disturbing activity is also the person
conducting the borrow
or waste
disposal
activity, areas from which borrow
is obtained and which are not regulated by the provisions of the Mining
Act of 1971, and waste
areas for surplus materials other than landfills regulated by the State Department of Environmental Quality’s Division of Solid Waste
Management, shall be considered as part of the land-disturbing activity where the borrow
material is being used or from which the waste
material originated. When the person
conducting the land-disturbing activity is not the person
obtaining the borrow
and/or disposing of the waste
, these areas shall be considered a separate land-disturbing activity. The name and location of any borrow
and/or waste
areas shall be provided to the Durham County Erosion
Control Office
upon request.
Land-disturbing activity in connection with construction in, on, over, or under a lake or natural watercourse
shall minimize the extent and duration of disruption of the stream
channel. Where relocation of a stream
forms an essential part of the proposed activity, the relocation shall minimize unnecessary changes in the stream
flow characteristics.
During the development
of a site, the person
conducting the land-disturbing activity shall install and maintain all temporary and permanent erosion
and sedimentation
control measures as required by the North Carolina Sedimentation
Pollution Control Act of 1973, as amended, and all rules and orders adopted pursuant to it (the Act), this section, rules or orders adopted or issued pursuant to this section or the Act, or an approved sedimentation
and erosion control plan
. After site development
, the land owner
or person
in possession or control of the land shall install and/or maintain all necessary permanent erosion
and sediment
control measures, except those measures installed within a road
or street right-of-way
or easement
accepted for maintenance by a governmental agency
.
Where inspections are required by paragraph 3.8.6, Self-Inspections, the following apply:
A. The person
who performs the inspection shall make a record of the site inspection by documenting the following items:
1. All of the erosion
and sedimentation
control measures, practices and devices, as called for in a construction sequence consistent with the approved erosion
and sedimentation
control plan, including but not limited to sedimentation
control basins, sedimentation
traps, sedimentation
ponds, rock dams, temporary diversions, temporary slope drains, rock check dams, sediment
fence or barriers, all forms of inlet protection, storm drainage facilities
, energy dissipaters
, and stabilization methods of open channels, have initially been installed and do not significantly deviate (as defined in paragraph 12.10.10A.5) from the locations, dimensions and relative elevations shown on the approved erosion
and sedimentation
plan. Such documentation shall be accomplished by initialing and dating each measure or practice shown on a copy of the approved erosion
and sedimentation
control plan or by completing, dating and signing
an inspection report that lists each measure, practice or device shown on the approved erosion
and sedimentation
control plan. This documentation is required only upon the initial installation of the erosion
and sedimentation
control measures, practices and devices as set forth by the approved erosion
and sedimentation
control plan or if the measures, practices and devices are modified after initial installation;
2. The completion of any phase of grading
for all graded
slopes and fills shown on the approved erosion
and sedimentation
control plan, specifically noting the location and condition of the graded
slopes and fills. Such documentation shall be accomplished by initialing and dating a copy of the approved erosion
and sedimentation
control plan or by completing, dating and signing
an inspection report;
3. The location of temporary or permanent ground cover
, and that the installation of the ground cover
does not significantly deviate (as defined in paragraph 12.10.10A.5) from the approved erosion
and sedimentation
control plan. Such documentation shall be accomplished by initialing and dating a copy of the approved erosion
and sedimentation
control plan or by completing, dating and signing
an inspection report;
4. That maintenance and repair requirements for all temporary and permanent erosion
and sedimentation
control measures, practices and devices have been performed. Such documentation shall be accomplished by completing, dating and signing
an inspection report (the general stormwater
permit monitoring form may be used to verify the maintenance and repair requirements); and
5. Any significant deviations from the approved erosion
and sedimentation
control plan, corrective actions required to correct the deviation and completion of the corrective actions. Such documentation shall be accomplished by initialing and dating a copy of the approved erosion
and sedimentation
control plan or by completing, dating and signing
an inspection report. A significant deviation means an omission, alteration or relocation of an erosion
or sedimentation
control measure that prevents the measure from performing as intended.
B. The documentation, whether on a copy of the approved erosion
and sedimentation
control plan or an inspection report, shall include the name, address, affiliation, telephone number, and signature of the person
conducting the inspection and the date of the inspection. Any relevant licenses and certifications may also be included. Any documentation of inspections that occur on a copy of the approved erosion
and sedimentation
control plan shall occur on a single copy of the plan and that plan shall be made available on the site. Any inspection reports shall also be made available on the site.
C. The inspection shall be performed during or after each of the following phases of a plan:
1. Installation of perimeter erosion
and sediment
control measures;
2. Clearing and grubbing of existing ground cover
;
3. Completion of any phase of grading
of slopes or fills that requires provision of temporary or permanent ground cover
pursuant to NCGS § 113A-57(2);
4. Completion of storm drainage facilities
;
5. Completion of construction or development
; and
6. Quarterly until the establishment of permanent ground cover
sufficient to restrain erosion
or until the financially responsible party has conveyed ownership or control of the tract
of land for which the erosion
and sedimentation
control plan has been approved and the agency
that approved the plan has been notified. If the financially responsible party has conveyed ownership or control of the tract
of land for which the erosion
and sedimentation
control plan has been approved, the new owner
or person
in control shall conduct and document inspections quarterly until the establishment of permanent ground cover
sufficient to restrain erosion
.
Whenever the Sedimentation
and Erosion
Control Officer
, or designee, determines that significant sedimentation
is occurring as a result of land-disturbing activity, despite application and maintenance of protective practices, the person
conducting the land-disturbing activity will be required to and shall take the additional protective action directed.
1. A performance guarantee, as described below, shall be for the completion of required improvements if landscaping, recreational facilities, committed elements
, or required infrastructure including but not limited to stormwater
, streets, sidewalks, or water and sewer improvements, has not been completed in accordance with the approved construction drawings, site plan
, or plat
as applicable.
2. For a project requiring multiple guarantees, a single guarantee may be posted in lieu of multiple guarantees. This allowance shall not apply to guarantees required for erosion
control and stormwater
control measures.
1. The responsible department shall require a performance guarantee in the amount of 125% of the reasonable estimated cost to complete the infrastructure or other improvement calculated as of the time the performance guarantee is issued, as determined by the applicable director or designee.
2. Any extension of the performance guarantee necessary to complete required improvements shall not exceed 125% of the reasonably estimated cost of completion of the remaining incomplete improvements still outstanding at the time the extension is obtained, as determined by the applicable director or designee.
The applicable department director or designee shall specify when a performance guarantee shall be submitted.
A performance guarantee may be in the form of a surety bond, letter of credit, or other form of guarantee that provides equivalent security to a surety bond or letter of credit.
A performance guarantee shall be conditioned upon the performance of all work necessary to complete the specified improvements and the delivery of all necessary encroachment
agreements, with said performance and delivery to be done by a specified completion date as allowed per NCGS § 160D-804.1.
The performance guarantee shall be returned or released, as appropriate, in a timely manner upon the acknowledgment by the City or County that the improvements and conditions for which the performance guarantee is being required are complete.
If the improvements are not complete and the current performance guarantee is expiring, the performance guarantee shall be extended, or a new performance guarantee issued, for an additional period limited to the duration necessary to complete required improvements. A developer
shall demonstrate reasonable, good faith progress toward completion of the required improvements that are the subject of the performance guarantee or any extension.
For required improvements other than infrastructure, if the responsible department director or designee determines the completion of the improvement prior to issuance of a certificate of compliance
is not practicable, and sufficient justification for the delay has been shown, certificates of compliance may be issued if an adequate performance guarantee is provided. In such event, the requirements for performance guarantees within this section shall apply.