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Durham City Zoning Code

Article

12 Infrastructure and Public Improvements

Sec. 12.6 Railroad Corridors

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 developmentClosed plans, site plansClosed and subdivisionClosed platsClosed.

12.6.3. The rail bed and original right-of-wayClosed shall be designated for the purpose of dedicationClosed or reservationClosed in accordance with requirements for dedicationClosed and reservationClosed pursuant to Sec. 12.5, Recreation Land. DedicatedClosed railroad corridors shall reduce the applicant’s obligation to dedicateClosed recreation land under Sec. 12.5, Recreation Land, by the amount of the corridor dedicatedClosed.

12.6.4. Unless agreements have been established that prohibit a railroad crossing, the following shall apply:

A. Crossing of the railroad right-of-wayClosed 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 ownerClosed due to:

1. Lack of access; or

2. Design constraints that severely limit the developmentClosed potential of the property.

12.1.1. General

A. Applicability

The requirements of this Article shall apply to all developmentClosed, unless expressly exempted by the language of the sections below.

B. Mitigation

The approving authority can require on- and off-site improvements to mitigate the impacts of the proposed developmentClosed.

C. Clearing and Grading

1. All property required to be dedicatedClosed, reservedClosed or otherwise set aside and identified on the approved site planClosed or preliminary platClosed shall be surveyed, staked, and appropriately marked and protected prior to beginning clearing and gradingClosed work.

2. All clearing and gradingClosed work shall be in conformance with the approved site planClosed or preliminary platClosed.

D. Floodplains

Base floodplain elevation data shall be provided for all developmentClosed proposals that are impacted by a floodplain as required by Sec. 8.4, Floodplain and Flood Damage Protection Standards.

E. Compliance

Prior to any land disturbing activityClosed, the applicant shall comply with all Federal, State, and local permitting requirements.

F. Utility Lines and Drainage Channels

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.

G. Consistency with Adopted Plans

DevelopmentClosed shall comply with adopted public plans for the area in which it is located. This includes plans for public facilitiesClosed such as rights-of-way, parks and open spaceClosed, schools, and other similar facilities.

12.1.2. Survey Monuments and Markers

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.

12.1.4. Required Easements

A. Storm drainage and utility easementsClosed 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. EasementsClosed for other purposes, including but not limited to trails and greenways, scenic views, historic preservation, cemeteryClosed access, and unique natural sites, shall be designed for reservationClosed or dedicationClosed as appropriate.

C. All site plansClosed and platsClosed shall exhibit standard easementClosed notes stating the type and purpose of the easementClosed along with a list of prohibited uses/activities within the easementClosed.

D. Any cross access agreement shall specify maintenance responsibilities and require that access be unrestricted. The agreement and a platClosed depicting the easementClosed 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.

12.2.1. Dedicated and Publicly Maintained Streets

DedicatedClosed and publicly maintained streets shall be required for developmentClosed in all districts except as described in paragraph 12.2.2A, Private Streets or RoadsClosed. An unlimited number of buildingClosed permits can be issued for land parcelsClosed adjacentClosed 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.

12.2.2. Other Forms of Access

No buildingClosed shall be erected or enlarged on a parcelClosed in any district unless such parcelClosed abuts upon or has access to a publicly accepted and maintained street, except in the following circumstances.

A. Private Streets or Roads

Private streets or roadsClosed 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.

1. Residential

a. For up to six single-familyClosed detached or duplex lots. Lots permanently protected as open spaceClosed, on which no developmentClosed rights remain, shall not be counted in determining the number of lots on a private street;

b. For multifamilyClosed developmentsClosed or multifamilyClosed areas of developmentClosed;

c. If shown on an approved development planClosed as private streets;

d. Within Conservation SubdivisionsClosed designed and established pursuant to paragraph 6.2.4, Conservation SubdivisionClosed; or

e. (County only) For single-familyClosed subdivisionsClosed that meet both of the following conditions:

(1) The private street(s) are within an additional phase to an existing single-familyClosed subdivisionClosed that already maintain private streets; and

(2) The subdivisionClosed as a whole crosses a County line in which the other county allows private streets.

2. Nonresidential

For any nonresidential developmentClosed in a nonresidential district.

B. Ingress/Egress/Regress Easements Other than Private Streets

Unless otherwise allowed in this Ordinance, ingress/egress easementsClosed not involving construction of a private street shall be permitted in the following circumstances:

1. Single-Family Residence

EasementsClosed shall be allowed for one single-familyClosed residence on an existing lot of recordClosed as of September 16, 1996. The parcelClosed shall not be further subdivided.

2. Other Instances
a. Ingress/Egress/Regress Easements of Record

Ingress/egress/regress easementsClosed of record that were recorded as of September 16, 1996, can continue to serve as access.

b. Driveways

A drivewayClosed shall be allowed for vehicular access to multiple parcelsClosed or lots:

(1) Within a townhouseClosed or detached rowhouse developmentClosed or shopping centerClosed, even if those parcelsClosed or lots are individually owned. Any such drivewayClosed within a townhouseClosed or detached rowhouse developmentClosed 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. DrivewaysClosed and other ingress/egress easementsClosed serving a residential developmentClosed 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 parcelClosed(s), and

(2) The access drive or easementClosed is not within an existing or proposed vehicleClosed use area.

12.2.4. External Access Required

A. External motor vehicleClosed access to developmentClosed shall be provided as indicated below. In determining the number of access points that shall be required, the cumulative impacts of prior developmentsClosed on the roadsClosed shall be considered.

B.     External Access Requirements for Residential and Other Developments

Table 1: Minimum DevelopmentClosed Access Points for Pedestrians and VehiclesClosed

DevelopmentClosed Type and Size

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

 

1. Single-Building Apartment Complex Exemption

Standalone apartment complexes which consist of a single buildingClosed and independent of the number of dwelling unitsClosed, shall require a minimum of one point of vehicular and pedestrian access.

2. External Access Exemption

The requirements for vehicular and pedestrian access points required in 12.2.4 shall not apply to Design Districts, see Sec. 16.4, StreetscapeClosed, Right-of-WayClosed, and BlockClosed/Lot Standards.

12.3.1. Street Layout

Within any proposed developmentClosed, 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.

A. Right-of-Way

1. A proposed right-of-wayClosed shall be of sufficient width to accommodate the required cross section of the roadway. In no case shall the proposed right-of-wayClosed be less than the currently adopted standards by the City or NCDOT, as applicable.

2. Right-of-wayClosed shall be dedicatedClosed and/or reservedClosed and improvements installed to City or NCDOT standards for each class of street as follows:

a. Freeways

The entire right-of-wayClosed shall be reservedClosed for future acquisition and improvement by the public.

b. All Other Public Streets

(1) New Streets

The right-of-wayClosed required to accommodate the proposed developmentClosed shall be dedicatedClosed, with the remainder reservedClosed. The applicant shall be required to install improvements sufficient to service traffic demands of proposed developmentClosed.

(2) Existing Streets

The applicant shall dedicateClosed or reserveClosed additional right-of-wayClosed and install improvements as required to serve proposed developmentClosed. Other improvements shall be installed according to the City Public Works Reference Guide for DevelopmentClosed or NCDOT standards, as applicable.

3. Right-of-wayClosed dedicationClosed 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. DedicationClosed of right-of-wayClosed that does not satisfy, or aid in satisfying, an identified public purpose shall not be shown or approved on any applicable site planClosed or platClosed.

B. Grades and Curves

Proposed streets shall be designed in accordance with the standards and specifications of the City Public Works Department or NCDOT, as applicable.

C. Intersections

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 drivewayClosed 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.

D. Sight Triangles

1. Intersections and Corner Lots

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.

2. Driveways

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

3. Design Standards

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 gradeClosed of the street or drive, shall not be allowed.

4. Alternative Dimensions

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 widthClosed;

b. Posted speed limits;

c. Stopping position;

d. Field obstructionsClosed;

e. Horizontal and vertical curves;

f. Travel direction (one-way vs. two-way streets); and

g. Traffic control measures (signals, roundabouts, etc.).

E. Cul-de-sac Streets

Cul-de-sacClosed streets shall not be longer than 800 feet and shall be terminated by a circular right-of-wayClosed 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-sacClosed streets shall be measured from the centerline of the bulb to the edge of pavement at the nearest intersection.

F. Stub Outs

1. Unless exempted below, stub outsClosed shall be required on each side (as defined by each of the cardinal directions) of a developmentClosed as follows:

Table 1

Lineal Stub OutClosed Requirement (Feet)

Applicable Zoning Districts

At least one stub outClosed for every 650 linear feet on any single side of a proposed developmentClosed

RU-M, RC (20 max); RS-M(D) (18 max); PDR (above 8.000); CSD; MU; CD; DD; CI; CN

At least one stub outClosed for every 1,000 linear feet on any single side of a proposed developmentClosed

RU-5 (8 max); RS-M (8 max); RS-8 (5 max); PDR (below 8); OI; CG; CC

At least one stub outClosed for every 1,000 linear feet on any single side of a proposed developmentClosed

RR; RS-20 (2 max); RS-10 (4 max); I; IL; IP; SRP; UC

 

2. Stub outs shall not be required if:

a. AdjacentClosed existing developmentClosed has not made any accommodation for such connections; or

b. AdjacentClosed sites are permanently protected from developmentClosed through conservation easementsClosed or ownership that precludes developmentClosed; 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 developmentClosed 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.

3. Connections

The proposed street layout in new developmentClosed shall be coordinated with the existing street system with connections made at all stub outsClosed. Stub outs shall be built to the edge of the site.

a. Alternatives to buildingClosed 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 outClosed shall be provided pursuant to the requirements of the City’s Reference Guide for DevelopmentClosed

(b) Construction and slope easementsClosed, and the right-of-wayClosed required to build the stub outClosed, shall be dedicatedClosed

(2) Any other request to modify this requirement will require a varianceClosed for the minimum modification necessary to provide relief, per Sec. 3.16, VarianceClosed. If a varianceClosed 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 DevelopmentClosed.  

(b) Construction and slope easementsClosed, and the right-of-wayClosed required to build the stub outClosed, shall be dedicatedClosed

b. Where no full connection can be made as a result of the topography of the site being developedClosed, the developerClosed shall install a cul-de-sacClosed bulb or other turnout facility at the stub outClosed constructed according to the City of Durham Reference Guide for DevelopmentClosed..

4. Street Connection Notice Sign

A four square foot signClosed 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 signClosed shall comply with any applicable City of Durham Department of Transportation, NCDOT, and MUTCD standards.

G. Alleys

AlleysClosed shall be permitted and designed in accordance with design criteria established by the City or NCDOT, as applicable.

H. Reserve Strips Controlling Access

The reservationClosed of private property strips of too narrow a depth to permit developmentClosed as a means of controlling access to public ways shall not be permitted.

I. Frontage Roads and Access Streets

Where a developmentClosed abuts or contains a controlled or limited access right-of-wayClosed, whether existing or proposed, an access street or frontage roadClosed shall be required.

12.3.2. Street Names

A. General

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-wayClosed 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-wayClosed under NCDOT control.

a. Except for a full or proper name, the initial naming of a right-of-wayClosed or drivewayClosed, as allowed in this section, shall be reviewed for approval on a final platClosed.

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.

B. Public or Private Streets

A street name shall be established for a public street or a private street.

C. Townhouses and Pedestrian Malls

A street name can be established for a drivewayClosed allowed for access within a townhouseClosed or detached rowhouse developmentClosed under paragraph 12.2.2B.2.b. above, and for a pedestrian mallClosed under paragraph 16.4.3C, Pedestrian MallsClosed. Establishing a name shall not result in circumventing developmentClosed requirements for private streets, sidewalks, street trees, or other items.

D. Rules for Names

The following rules shall apply for approval of any new street name.

1. Names submitted for approval of a new developmentClosed shall be limited to only the number of names needed for the developmentClosed. No extra names shall be reservedClosed 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 ROADClosed” 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.

6. Streets shall have unique names, including primary names and suffixes.

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 ROADClosed would not be appropriate along the south shores of Jordan Lake.

8. Additional Restrictions

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 signsClosed 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.

12.3.3. Street Signs and Markers

A. Standard street name signsClosed shall be installed at one corner of all street intersections, including private streets and named drivewaysClosed allowed for access within townhouseClosed or detached rowhouse developmentsClosed under paragraph 12.2.2B.2.b above. The size, design, materials, location, fabrication, installation, and maintenance of the signsClosed and poles within the public right-of-wayClosed and elsewhere shall be in accordance with City Transportation Department or NCDOT standards, as applicable. The developerClosed or ownerClosed of a private street or a common area in which a named drivewayClosed is located shall be responsible for permanent maintenance as well as fabrication and installation.

B. SignsClosed denoting the beginning and ending of public maintenance shall also be erected and maintained on private streets and shall be required on named drivewaysClosed allowed for access within townhouseClosed or detached rowhouse developmentsClosed under paragraph 12.2.2B.2.b above that intersect with the public right-of-wayClosed. All such signsClosed shall conform to the street name signClosed requirements of paragraph A above.

C. SignsClosed denoting the right-of-wayClosed boundaries of dedicatedClosed or reservedClosed, unopened streets shall be erected and maintained according to City or County standards.

12.3.4. Street Lights

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 utilityClosed standards, including appropriate separation from street trees.

12.4.1. General

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 subdivisionClosed plans. Such systems shall be designed to connect with all elements within the developmentClosed, adjacentClosed 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, dedicationsClosed, easementsClosed, and reservationsClosed 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.

12.4.2. Sidewalk Requirement

A. A sidewalk shall be provided along public or private right-of-wayClosed as shown in the table below.

Street Type

Rural Tier

All Other Tiers

FreewaysClosed; ExpresswaysClosed

None

None

All other streets

None

Both Sides

B. Preliminary and minor platsClosed, and developmentsClosed required to improve existing right-of-wayClosed to City or NCDOT standards, as applicable, shall provide public sidewalk within right-of-wayClosed pursuant to paragraph 12.4.2A, Sidewalk Requirement.

C. For all other developmentClosed except as exempted pursuant to paragraph 12.4.2D, Exemptions, required sidewalk along the right-of-wayClosed frontage of the developmentClosed 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:

1. Sidewalk located within the right-of-way and/or on-site

a. Sidewalk shall connect to external sidewalks that extend to the property of the subject developmentClosed, including connectivity to crosswalks and end of pavement at all adjacentClosed intersections.

b. Sidewalk located on-site shall meet the following criteria:

(1) The sidewalks shall be located within a public access easementClosed;

(2) The maximum distance from the right-of-wayClosed, measured to the closest edge of the sidewalk to the right-of-wayClosed, 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-wayClosed.

2. Payment-in-lieu (City only)

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 easementClosed shall be provided along frontage of the subject property where no sidewalk is proposed if the existing right-of-wayClosed 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 developmentClosed projects, unless exempt per paragraph 12.4.2D, Exemptions.

D. Exemptions

The following shall be exempt from the installation of public sidewalk:

1. Sidewalk shall not be required when developmentClosed 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 vehicleClosed parking consisting of less than four spaces;

c. Additions of less than 1,000 square feet of buildingClosed area;

d. Improvements that are documented to solely bring existing facilities up to current health, safety, or buildingClosed code requirements;

e. GradingClosed 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-wayClosed that is not required to be improved as part of the developmentClosed project.

E. Alternative Pedestrian Plans

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 developClosed sidewalks and/or walkways pursuant to the plan in lieu of sidewalk requirements of this section.

a. If aspects of sidewalk developmentClosed 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.

F. (County Only) Additional Requirements for the SRP-C District

1. Sidewalk shall be provided along both sides of public or private right-of-wayClosed.

2. Along right-of-wayClosed with curb and gutter located internal to the developmentClosed, 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.

12.4.3. Additional Standards for Pedestrian and Bicycle Facilities

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. AdjacentClosed 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.

D. Internal Walkways

1. Walkways shall be provided to satisfy paragraph 12.4.1, General. Additionally, walkways shall be provided along common access drivewaysClosed and areas that serve as ingress/egress for the developmentClosed site pursuant to paragraph 12.2.2B.2.b, DrivewaysClosed, as follows:

a. A walkway shall be placed along both sides of the drivewayClosed or area.

b. The walkway shall be located no more than five feet from the edge of drivewayClosed or area.

c. DrivewaysClosed and areas that solely serve as access for rear-loaded townhousesClosed or detached rowhouses or loading areasClosed 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.

12.4.4. Dimensions and Design

A. Sidewalks

1. In right-of-wayClosed 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 developmentClosed 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 roadsClosed sidewalks shall be located behind the roadside ditch or guardrail.

B. Bicycle Facilities

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 roadClosed 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.

C. Shared Facilities

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 developedClosed 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.

D. Standards

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

12.5.2. Dedication, Impact Fees, and Payment-in-Lieu

A. In the County

1. The applicant for a residential developmentClosed shall be responsible for either:

a. DedicatingClosed 1,150 square feet of land for recreation purposes (including active and passive recreationClosed areas, including trails) for each proposed dwelling unitClosed; or

b. Making payment-in-lieu equivalent to the tax value of 1,150 square feet of comparable property per dwelling unitClosed.

2. One of the following shall be required:

a. DedicationClosed of land; or

b. Payment-in-lieu of dedicationClosed.

B. In the City

1. The applicant for a residential developmentClosed shall be responsible for:

a. Paying a recreation impact fee or dedicatingClosed 575 square feet of land for parks and active recreationClosed areas for each proposed dwelling unitClosed; and

b. Paying a resource based recreation impact fee or dedicatingClosed 575 square feet of land for passive recreationClosed areas (including trails) for each proposed dwelling unitClosed.

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 developmentClosed is located on the Durham Trails and Greenways Master Plan or the Durham Comprehensive Bicycle Transportation Plan:

a. Payment of an impact fee;

b. DedicationClosed of land; or

c. Payment-in-lieu of dedicationClosed.

12.7.1. Water and Sanitary Sewer Systems

A. General

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 agencyClosed responsible for approval.

B. Public

Installation of improvements which are extensions to existing public systems shall be approved by the public utilityClosed 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 structureClosed 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 watershedClosed protection overlays.

C. Community

Community systems designed to serve more than one user independent of public systems shall be allowed if approved by the State of North Carolina.

12.8.1. Stormwater Management

A. Any land-disturbing activity may be required to provide stormwaterClosed management facilities or make other improvements to the existing drainage system to address water quantity concerns, water quality concerns, or both if the proposed developmentClosed will increase potential flood damages to existing properties or significantly increase pollutant levels in downstream receiving waters.

B. StormwaterClosed 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 streamsClosed 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 stormwaterClosed flows.

C. DevelopmentClosed plans, site plansClosed, and preliminary platsClosed shall require a stormwaterClosed 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 runoffClosed on downstream stormwaterClosed facilities and properties.

D. The need for stormwaterClosed management facilities to address offsite impacts shall be determined by the City Public Works Director or County Engineer, or their designees, as appropriate.

12.8.2. Regulation

A. City Stormwater

City stormwaterClosed facilities shall be regulated pursuant to the applicable City code.

B. County Stormwater

County stormwaterClosed facilities shall be regulated pursuant to the applicable County code.

12.9.1. Installation

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 plansClosed, preliminary platsClosed, and final platsClosed clearly show all related easementsClosed and right-of-wayClosed.

B. Utilities shall be installed underground for any subdivisionClosed requiring preliminary platClosed 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 developmentClosed site and are existing above ground at time of application, even if subsequently relocated as part of the developmentClosed.

12.10.1. Purposes

A. This Section is adopted for the purposes of:

1. Regulating private, non-exempt land-disturbing activity to control accelerated erosionClosed and sedimentationClosed in order to prevent the pollution of water and other damage to lakes, watercoursesClosed and other public and private property by sedimentationClosed; and

2. Establishing procedures through which these purposes can be fulfilled.

B. No personClosed shall undertake any land-disturbing activity without first obtaining a permit from the SedimentationClosed and ErosionClosed Control OfficerClosed or designee as required by this section.

12.10.2. Applicability

A. Exemptions

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 developedClosed as a unit will be aggregated. Notwithstanding this provision, an erosion control planClosed and/or permit may be required by the SedimentationClosed and ErosionClosed Control OfficerClosed 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 parentClosed, subsidiaryClosed, or other affiliateClosed of the applicant has engaged in any activity enumerated in paragraph 3.8.7, Disapproval of Plan;

3. Agricultural Exemption

As set forth in NCGS § 113A-52.01, land-disturbing activities relating or incidental to the production of cropsClosed, grains, fruits, vegetables, ornamental and flowering plants, dairy, livestockClosed, poultry, and all other forms of agriculture undertakenClosed on agricultural land for the production of plants and animals useful to man, including but not limited to:

a. Forage and sod cropsClosed, grain and feed cropsClosed, tobacco, cotton and peanuts;

b. Dairy animals and dairy products;

c. Poultry and poultry products;

d. LivestockClosed, 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 undertakenClosed 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 undertakenClosed 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 undertakenClosed by personsClosed as defined in NCGS § 113A-52(8) who are otherwise regulated by the provisions of the MiningClosed 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 undertakenClosed for the duration of an emergency, activities essential to protect human life;

8. Activities undertakenClosed to restore the wetlandClosed functions of converted wetlandsClosed to provide compensatory mitigation to offset impacts permitted under Section 404 of the Clean Water Act; and

9. Activities undertakenClosed pursuant to Natural Resources Conservation Service standards to restore the wetlandsClosed functions of converted wetlandsClosed as defined in Title 7 Code of Federal Regulations Sec. 12.2 (January 1, 2014 Edition).

B. Plan Required

Subject to the exemptions listed in subsection 12.10.2, a sedimentationClosed and erosion control planClosed 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) watershedClosed protection overlay district. The SedimentationClosed and ErosionClosed Control OfficerClosed 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 parentClosed, subsidiaryClosed, or other affiliateClosed 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
20,000 s.f.

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 parentClosed, subsidiaryClosed, or other affiliateClosed of the applicant has engaged in any activity enumerated in paragraph 3.8.7, Disapproval of Plan.

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)).

 

C. Protection of Property

PersonsClosed conducting land-disturbing activity shall take all reasonable measures to protect all public and private property from damage caused by such activity.

D. More Restrictive Rules Shall Apply

Whenever conflicts exist between federal, State or local laws, ordinances or rules, the more restrictive provision shall apply.

12.10.3. Basic Control Objectives

In order for a sedimentationClosed and erosion control planClosed to be approved, the following control objectives shall be met:

A. Identify Critical Areas

On-site areas which are subject to severe erosionClosed, and off-site areas which are especially vulnerable to damage from erosionClosed and/or sedimentationClosed, are to be identified and receive special attention;

B. Limit Time of Exposure

All land-disturbing activity is to be planned and conducted to limit exposure to the shortest feasible time;

C. Limit Exposed Areas

All land-disturbing activity is to be planned and conducted to minimize the size of the area to be exposed at any one time;

D. Control Surface Water

Surface water runoffClosed originating upgrade of exposed areas shall be controlled to reduce erosionClosed and sedimentClosed loss during the period of exposure;

E. Control Sedimentation

All land-disturbing activity is to be planned and conducted so as to restrain off-site sedimentationClosed damage; and

F. Manage Stormwater Runoff

When the increase in the velocity of stormwater runoffClosed resulting from a land-disturbing activity is sufficient to cause accelerated erosionClosed of the receiving watercourseClosed, plans are to include measures to control the velocity at the point of discharge so as to minimize accelerated erosionClosed of the site and increased sedimentationClosed of the streamClosed.

12.10.4. Mandatory Standards for Land-Disturbing Activity

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 ErosionClosed and SedimentClosed 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.

A. Buffer Zones

Except where more stringent bufferClosed 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 watercourseClosed unless a buffer zoneClosed is provided along the margin of the watercourseClosed of sufficient width to confine visible siltationClosed within the 25% of the buffer zoneClosed 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 watercourseClosed; and

2. Unless otherwise provided, the width of a buffer zoneClosed 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 siltationClosed.

3. Two rows of silt fence shall be placed along all bufferClosed zones. Rows should be spaced a minimum of three (3) feet apart.

B.   Stabilization of Disturbed Land

The angle for disturbed land shall be no greater than the angle which can be retained by vegetative cover or other adequate erosionClosed control devices or structures.

1. Ongoing Activity
a. Ground Cover

Land left exposed shall be planted or otherwise provided with temporary ground coverClosed, devices, or structures sufficient to restrain erosionClosed within the applicable time period after completion of any phase of gradingClosed 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 sedimentationClosed and erosionClosed 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.

b. Soil Stockpiles

Soil stockpiles shall be limited to the shorter of 30 feet above existing gradeClosed or half the height of adjacentClosed 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.

2. Completed Activity

For any area of land-disturbing activity where gradingClosed activities have been completed, temporary or permanent ground coverClosed sufficient to restrain erosionClosed shall be provided as soon as practicable, but in no case later than seven days after completion of gradingClosed.

C. Stabilization of Sedimentation and Erosion Control Devices

Whenever land-disturbing activity exceeds 12,000 square feet, the personClosed conducting the land-disturbing activity shall install such sedimentationClosed and erosionClosed control devices and practices as are sufficient to retain the sedimentClosed generated by the land-disturbing activity within the boundaries of the tractClosed during construction upon and developmentClosed of such tractClosed, and shall plant or otherwise provide a temporary ground coverClosed sufficient to restrain erosionClosed generated by such devices and practices within seven days.

D. ErosionClosed and sedimentationClosed control measures, structures and devices shall be so planned, designed and constructed as to provide protection from the calculated maximum peak of runoffClosed from the 25-year storm. RunoffClosed 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 SedimentationClosed and ErosionClosed Control OfficerClosed or designee.

E. Each sedimentClosed 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 sedimentClosed 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 sedimentClosed basin or trap. If the temporary sedimentClosed basin or trap is to be converted to a permanent stormwaterClosed 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 ErosionClosed Control OfficeClosed.

F. SedimentClosed 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 runoffClosed of that two-year storm that producesClosed the maximum peak rate of runoffClosed 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 agencyClosed of the State or the United States or any generally recognized organization or association.

G. SedimentClosed basins and traps shall not be installed in perennial or intermittent streamsClosed.

H. Existing ponds and lakes shall not be used as sedimentClosed basins or traps.

I. DeveloperClosed shall retain control of permitted area, including sedimentClosed basins or traps, until permit has been closed. For commercial sites, sold outparcelsClosed 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 erosionClosed.

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 zonesClosedes, 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 WatershedClosed, uncoveredClosed areas shall be limited at any time to a maximum total area of 20 acres. In high quality water HQW zonesClosedes, only the portion of the land-disturbing activity within a HQW zone shall be governed by this section. Larger areas within HQW may be uncoveredClosed with the written approval of the Director of DEQ, Division of Energy, Mineral and Land Resources. Larger areas within all other zones may be uncoveredClosed with the written approval of the Durham County ErosionClosed Control OfficeClosed.

M. Triassic Soil Specific Requirements

Triassic soils do not respond as well to conventional erosionClosed 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. SedimentClosed 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.

N. Flocculants

Flocculants are chemicals that can cause fine particles to combine and settle in detained runoffClosed. When used in conjunction with sedimentClosed basins or traps, they can reduce sedimentClosed in discharge leaving a site. The use of flocculants, where not required by Section 12.10.4M, is recommended in land disturbing activityClosed. When used, the following requirements apply:

1. A flocculant application plan shall be included on the erosion control planClosed, 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 screenedClosed using jar tests with multiple flocculants to select the appropriate flocculant. Jar testing can be performed by the contractorClosed 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 sedimentClosed 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 stormwaterClosed can be found at: https://cals.ncsu.edu/crop-and-soil-sciences/extension/publications/ (scroll down from top to find ErosionClosed, SedimentClosed, and Turbidity Control section).

12.10.5. Permanent Downstream Protection of Stream Banks, Channels and Slopes

A. Intent

StreamClosed banks and channels downstream from any land-disturbing activity shall be protected from increased degradation by accelerated erosionClosed caused by increased velocity of runoffClosed from the land-disturbing activity.

B. Performance Standard

The land-disturbing activity shall be planned and conducted such that the velocity of stormwater runoffClosed in the receiving watercourseClosed at the point of discharge resulting from a 25-year storm after developmentClosed 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 watercourseClosed 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

GradedClosed, Loam to Cobbles (noncolloidal)

Tatum gravelly silt loam, Nason stony silt loam, Goldston slaty (channery) silt loam

5.0

1.5

GradedClosed, Silt to Cobbles (colloidal)

 

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 watercourseClosed; or

Vegetatively Protected WatercoursesClosed and Point of StormwaterClosed Discharge

Group No.

Vegetation

Depth of
Flow (feet)

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 watercourseClosed determined for the ten-year stormClosed prior to developmentClosed.

C. If the conditions enumerated in paragraph B, Performance Standard, of this subsection cannot be met, the channel below the discharge pointClosed shall be designed and constructed to withstand the expected velocity.

D. Slope Protection

When soils with slopes as indicated in the following table, occur between a point of stormwaterClosed discharge and the next confluence of concentrated stormwater runoffClosed, such areas, on- or off-site, shall be protected from accelerated erosionClosed by diverting the stormwaterClosed discharge from those soil surfaces. Diversion may include the provision of piped, paved or armored storm drainage facilitiesClosed.

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

 

E. Acceptable Management Measures

Measures applied alone or in combination to satisfy the intent of this section are acceptable if there are no objectionable secondary consequences. The State SedimentationClosed Control Commission recognizes that the management of stormwater runoffClosed to minimize or control downstream channel and bank erosionClosed is a developingClosed technology. Innovative techniques and ideas will be considered and may be used when shown to have the potential to produceClosed successful results. Some alternatives are to:

1. Avoid increases in surface runoffClosed volume and velocity by including measures to promote infiltration to compensate for increased runoffClosed from areas rendered impervious;

2. Avoid increases in stormwaterClosed discharge velocities by using vegetated or roughened swales and waterways in lieu of closed drains and high velocity paved sections;

3. Provide energy dissipatersClosed at outlets of storm drainage facilitiesClosed to reduce flow velocities at the point of discharge. These may range from simple rip-rapped sections to complex structures; and

4. Protect watercoursesClosed subject to accelerated erosionClosed by improving cross sections and/or providing erosionClosed-resistant lining.

F. Exceptions

This section shall not apply where it can be demonstrated, to the satisfaction of the SedimentationClosed and ErosionClosed Control OfficerClosed or designee that stormwaterClosed discharge velocities will not create an erosionClosed problem in the receiving watercoursesClosed.

12.10.6. Borrow and Waste Areas

When the personClosed conducting the land-disturbing activity is also the personClosed conducting the borrowClosed or wasteClosed disposalClosed activity, areas from which borrowClosed is obtained and which are not regulated by the provisions of the MiningClosed Act of 1971, and wasteClosed areas for surplus materials other than landfills regulated by the State Department of Environmental Quality’s Division of Solid WasteClosed Management, shall be considered as part of the land-disturbing activity where the borrowClosed material is being used or from which the wasteClosed material originated. When the personClosed conducting the land-disturbing activity is not the personClosed obtaining the borrowClosed and/or disposing of the wasteClosed, these areas shall be considered a separate land-disturbing activity. The name and location of any borrowClosed and/or wasteClosed areas shall be provided to the Durham County ErosionClosed Control OfficeClosed upon request.

12.10.7. Access and Haul Roads

Temporary access and haul roadsClosed, other than public roadsClosed, constructed or used in connection with any land-disturbing activity shall be considered a part of such activity.

12.10.9. Responsibility for Maintenance

During the developmentClosed of a site, the personClosed conducting the land-disturbing activity shall install and maintain all temporary and permanent erosionClosed and sedimentationClosed control measures as required by the North Carolina SedimentationClosed 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 sedimentationClosed and erosion control planClosed. After site developmentClosed, the land ownerClosed or personClosed in possession or control of the land shall install and/or maintain all necessary permanent erosionClosed and sedimentClosed control measures, except those measures installed within a roadClosed or street right-of-wayClosed or easementClosed accepted for maintenance by a governmental agencyClosed.

12.10.10. Self-Inspections

Where inspections are required by paragraph 3.8.6, Self-Inspections, the following apply:

A. The personClosed who performs the inspection shall make a record of the site inspection by documenting the following items:

1. All of the erosionClosed and sedimentationClosed control measures, practices and devices, as called for in a construction sequence consistent with the approved erosionClosed and sedimentationClosed control plan, including but not limited to sedimentationClosed control basins, sedimentationClosed traps, sedimentationClosed ponds, rock dams, temporary diversions, temporary slope drains, rock check dams, sedimentClosed fence or barriers, all forms of inlet protection, storm drainage facilitiesClosed, energy dissipatersClosed, 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 erosionClosed and sedimentationClosed plan. Such documentation shall be accomplished by initialing and dating each measure or practice shown on a copy of the approved erosionClosed and sedimentationClosed control plan or by completing, dating and signingClosed an inspection report that lists each measure, practice or device shown on the approved erosionClosed and sedimentationClosed control plan. This documentation is required only upon the initial installation of the erosionClosed and sedimentationClosed control measures, practices and devices as set forth by the approved erosionClosed and sedimentationClosed control plan or if the measures, practices and devices are modified after initial installation;

2. The completion of any phase of gradingClosed for all gradedClosed slopes and fills shown on the approved erosionClosed and sedimentationClosed control plan, specifically noting the location and condition of the gradedClosed slopes and fills. Such documentation shall be accomplished by initialing and dating a copy of the approved erosionClosed and sedimentationClosed control plan or by completing, dating and signingClosed an inspection report;

3. The location of temporary or permanent ground coverClosed, and that the installation of the ground coverClosed does not significantly deviate (as defined in paragraph 12.10.10A.5) from the approved erosionClosed and sedimentationClosed control plan. Such documentation shall be accomplished by initialing and dating a copy of the approved erosionClosed and sedimentationClosed control plan or by completing, dating and signingClosed an inspection report;

4. That maintenance and repair requirements for all temporary and permanent erosionClosed and sedimentationClosed control measures, practices and devices have been performed. Such documentation shall be accomplished by completing, dating and signingClosed an inspection report (the general stormwaterClosed permit monitoring form may be used to verify the maintenance and repair requirements); and

5. Any significant deviations from the approved erosionClosed and sedimentationClosed 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 erosionClosed and sedimentationClosed control plan or by completing, dating and signingClosed an inspection report. A significant deviation means an omission, alteration or relocation of an erosionClosed or sedimentationClosed control measure that prevents the measure from performing as intended.

B. The documentation, whether on a copy of the approved erosionClosed and sedimentationClosed control plan or an inspection report, shall include the name, address, affiliation, telephone number, and signature of the personClosed 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 erosionClosed and sedimentationClosed 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 erosionClosed and sedimentClosed control measures;

2. Clearing and grubbing of existing ground coverClosed;

3. Completion of any phase of gradingClosed of slopes or fills that requires provision of temporary or permanent ground coverClosed pursuant to NCGS § 113A-57(2);

4. Completion of storm drainage facilitiesClosed;

5. Completion of construction or developmentClosed; and

6. Quarterly until the establishment of permanent ground coverClosed sufficient to restrain erosionClosed or until the financially responsible party has conveyed ownership or control of the tractClosed of land for which the erosionClosed and sedimentationClosed control plan has been approved and the agencyClosed that approved the plan has been notified. If the financially responsible party has conveyed ownership or control of the tractClosed of land for which the erosionClosed and sedimentationClosed control plan has been approved, the new ownerClosed or personClosed in control shall conduct and document inspections quarterly until the establishment of permanent ground coverClosed sufficient to restrain erosionClosed.

12.11.1. Filing of Performance Guarantees

A. Applicability

1. A performance guarantee, as described below, shall be for the completion of required improvements if landscaping, recreational facilities, committed elementsClosed, or required infrastructure including but not limited to stormwaterClosed, streets, sidewalks, or water and sewer improvements, has not been completed in accordance with the approved construction drawings, site planClosed, or platClosed 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 erosionClosed control and stormwaterClosed control measures.

B. Amount

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.

C. Timing

The applicable department director or designee shall specify when a performance guarantee shall be submitted.

12.11.2. Form and Conditions of Performance Guarantee

A. Form

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.

B. Conditions

A performance guarantee shall be conditioned upon the performance of all work necessary to complete the specified improvements and the delivery of all necessary encroachmentClosed agreements, with said performance and delivery to be done by a specified completion date as allowed per NCGS § 160D-804.1.

C. Release of Guarantee

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.

D. Extension

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 developerClosed shall demonstrate reasonable, good faith progress toward completion of the required improvements that are the subject of the performance guarantee or any extension.

12.11.3. Issuance of Certificate of Compliance

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 complianceClosed 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.