[Zoning Order §7.135, 4-2-2008]
A.
The
geotechnical study is to recommend courses of action that will allow
for the safe development of a site that may contain geological or
soil constraints. When required to provide a geotechnical study, the
minimum information shall be provided in the study:
1.
A description of the site and the existing topographic, geologic
and soils information to include slope categories, geologic formations,
soil types and vegetative cover.
2.
A statement and description of field test data. This
information must be adequate to accurately map all shale formations,
colluvial soils or loess deposits on natural slopes in excess of twenty
percent (20%), describe any shale beds, soil layer thickness, the
dip of any shale beds, the slope of any residual clay layers having
relatively thick soil layers above and the presence of any subsurface
water where grading is proposed to occur.
3.
Description of laboratory test data. This should
relate to the information found in the above described data gathering
requirements. The internal strength properties of all shale or other
potentially weak materials or contacts should be measured.
4.
An analysis of the above gathered information relative to any potential
site development problems. Landslide analysis should be broken into
properties such as affects of slope, material properties, dip of bedding
planes, slope on inclined loess or colluvium/residual clay layers,
effects of hydrostatic pressure, other effects of subsurface water,
etc.
5.
Recommendations to address any problems such as landsliding or expansive
soils.
6.
Recommendations for the proper placement or compaction of fill to
avoid potential problems or for suitable foundations.
7.
Recommendations for testing during construction such as density testing
including the location and frequency of such testing.
8.
Recommendations for walls, plant cover or other slope treatment that
may be necessary to ensure slope stability.
B.
All
projects requiring a geotechnical study shall also submit a post construction
report that includes as a minimum the following information:
[Zoning Order §7.140, 4-2-2008]
Where required, all exterior non-residential trash storage containers
shall be screened so that they are not visible from off the property.
Where individual trash enclosures are provided, screening shall be
constructed of masonry walls, decorative walls or fence, with a gate
(not plastic or vinyl) painted to be compatible with the color of
the walls or fence and the building it is to serve.
[Zoning Order §7.145, 4-2-2008]
A.
Any
development where a retaining wall or vertical cut is proposed in
an upward-sloping yard shall provide a minimum fifteen (15) foot wide
fall zone easement from the bottom of the wall. Any structure requiring
the issuance of a Jefferson County building permit, except a deck
without walls or a roof, shall not be located within the fall zone
easement.
B.
A
portion of every rear yard in residential developments shall provide
adequate usable space for outdoor recreation by the occupants of the
lot. At least thirty percent (30%) of the required rear yard area
must be usable, unless a variance is granted by the Jefferson County
Board of Zoning Adjustment. A usable space is a contiguous area with
grade less than thirty percent (30%).
[Zoning Order §7.150, 4-2-2008; Ord. No. 11-12-2008A
§§1 — 2(7.150), 11-12-2008; Resolution 1-14-2010A
Exh. A, 1-14-2010; Ord. No. 10-0145 §§1 — 2, 2-18-2010]
A.
Commercial
developments and other developments proposing parking lot and security
lighting shall:
1.
Provide a photometric diagram indicating the levels of foot-candles
throughout the site and at the property lines and as a part of the
preliminary development plan.
2.
Utilize lighting so as to direct the light downward to avoid "light
seepage". The light filament shall be shielded so the filament will
not be seen from neighboring properties. All lighting serving parking
lots shall be cut-off fixtures as defined by the Illuminating Engineering
Society of North America.
3.
Provide lighting at the intersection of each drive aisle or driveway
with the private, County-maintained and State-maintained streets.
4.
Provide lighting in accordance with the following table:
|
Table 7-1. Lighting Requirements
| ||||
|---|---|---|---|---|
|
Basic1
|
Enhanced Security2
| |||
|
Minimum foot-candles on pavement3
|
0.2 fc
|
0.5 fc
| ||
|
Maximum foot-candles on pavement
|
4.0 fc
|
7.5 fc
| ||
|
Uniformity ratio, maximum:minimum4
|
20:1
|
15:1
| ||
|
Minimum foot-candles at 5 feet above pavement5
|
0.1 fc
|
0.25 fc
| ||
|
fc = foot-candles
| ||||
|
1
|
For typical conditions. During periods of non-use, the illuminance
of certain parking facilities should be turned off or reduced to conserve
energy. If reduced lighting is to be used only for the purpose of
property security, it is desirable that the minimum (low point) value
not be less than one-tenth (0.1) foot-candle. Reductions should not
be applied to facilities subject to intermittent night use, such as
at apartments, hospitals and transportation terminals.
| |||
|
2
|
The enhanced security lighting level should be used when personal
security is an issue, such as where the parking facility is used during
all hours of the day and night, where special security needs exist
or where vandalism or crime are possible.
| |||
|
3
|
Measured on the parking surface, without any shadowing effect
from parked vehicles or trees at points of measurement.
| |||
|
4
|
The highest horizontal illuminance point at grade, divided by
the lowest horizontal illuminance point or area should not be greater
than the values shown.
| |||
|
5
|
Measured at five (5.0) feet above the parking surface at the
point of the lowest horizontal illuminance, excluding facing outward
along boundaries.
| |||
5.
Where security lighting is proposed, the following table shall govern
the range of permissible light levels for the listed applications.
Where a proposed security lighting application is not shown, the table
shall be used as a guide for establishing the range of permissible
light levels.
|
Table 7-2. Security Lighting Application
| |||
|---|---|---|---|
|
Location
|
Average Horizontal Illumination Level on Ground
| ||
|
Large open areas
|
0.5 — 2.0 fc 1
| ||
|
Buildings
|
0.5 — 2.0 fc 1
| ||
|
Perimeter fence
|
0.5 fc
| ||
|
Entrances
|
3 fc
| ||
|
Pedestrian pathways and access routes
|
4 — 6 fc
| ||
|
fc = foot-candle
| |||
|---|---|---|---|
|
1
|
The greater the brightness of the surrounding area, the higher
the illuminance required to balance the brightness.
| ||
C.
Floodlight
fixtures are prohibited on parking lot light poles, but may be used
as accent lighting only.
D.
Wall
pack light fixtures are allowed, provided that full cutoffs are utilized
to direct the light downward; and provided that no light source is
visible. Wall pack fixtures located internally to a common area for
multiple buildings may use light spreading fixtures approved by the
Director, provided they cannot be seen from residential property or
from adjacent streets.
[Zoning Order §7.155, 4-2-2008]
A.
Residential Developments.
1.
In developments with common open space, the design shall provide
at least one (1) access point from a street within the development
to such common ground and multiple points of access are encouraged.
2.
Common open space is encouraged to incorporate natural features and
recreational designs. Common open space may include a park, playground,
greenway or natural preserve meeting the following standards:
a.
Each such park should be at least one (1) acre and contain at least
one (1) acre for every fifty (50) dwelling units it is designed to
serve.
b.
Playgrounds should include at least one-quarter (¼) acre unless
located in a park. Each playground shall contain at least ten thousand
(10,000) square feet for every fifty (50) dwelling units it is designed
to serve.
c.
Greenways should provide connections to destinations of the neighborhood
and may follow along streams or floodplains. Greenways shall be at
least twenty (20) feet wide at all locations. Greenways should include
trails or paved pedestrian/bike paths.
Greenways should be designed to address issues of safety, visibility
and access for its users. A well-designed greenway will be designed
so that both the users and the trail are visible; so that ingress
and egress is controlled by some means such as a fence or hedge signaling
to users where they are and are not to walk; so that the private and
public spaces are distinguishable; and so that the greenway/trail
can be maintained by the homeowners' association.
B.
Non-Residential Developments.
1.
For non-residential sites in excess of two (2) acres, at least ten
percent (10%) of each lot should be open space.
2.
Open space should consist of landscaped areas, landscape islands,
natural preserves or plazas or courtyards meeting the following requirements:
a.
Landscaped areas include buffers, yards or any pervious surface meeting the landscaping requirements of Article XIV. Retention or detention basins may be used to meet open space requirements, if it is designed as a visual amenity for the development and the area surrounding the basin is accessible by walking paths or other recreation facility.
c.
Plazas or courtyards shall be at least four hundred (400) square
feet and be designed with landscaping materials and public seating.
However, only fifty percent (50%) of a lots required open space shall
consist of plazas or courtyards.
C.
Mixed Use Developments — Residential Uses.
1.
In developments with common open space, the design shall provide
at least one (1) access point from a street within the development
to such common ground and multiple points of access are encouraged.
2.
Common open space is encouraged to incorporate natural features and
recreational designs. Common open space may include a park, playground,
greenway or natural preserve meeting the following standards:
a.
Each such park should be at least one (1) acre and contain at least
one (1) acre for every fifty (50) dwelling units it is designed to
serve.
b.
Playgrounds should include at least one-quarter (¼) acre unless
located in a park. Each playground shall contain at least ten thousand
(10,000) square feet for every fifty (50) dwelling units it is designed
to serve.
c.
Greenways should provide connections to destinations of the neighborhood
and may follow along streams or floodplains. Greenways shall be at
least twenty (20) feet wide at all locations. Greenways should include
trails or paved pedestrian/bike paths.
d.
Greenways should be designed to address issues of safety, visibility
and access for its users. A well designed greenway will be designed
so that both the users and the trail are visible; so that ingress
and egress is controlled by some means such as a fence or hedge signaling
to users where they are and are not to walk; so that the private and
public spaces are distinguishable; and so that the greenway/trail
can be maintained by the homeowners' association.
D.
Mixed Use Developments — Residential And Non-Residential Uses. Each block should contain or be within one thousand (1,000) feet
from one (1) of the following types of common open space:
1.
A courtyard or plaza with landscaping materials and public seating;
2.
A greenspace or small park bordering a street right-of-way on at
least two (2) sides designed with landscaping materials and public
seating; or
3.
A greenway connecting the non-residential center of the mixed use
development to surrounding neighborhoods.
