For the purpose of this chapter, the Borough of Oakmont is hereby
divided into zoning districts as shown on the Official Zoning District
Map included as part of this chapter. Eleven specific land use classifications
and zoning districts are:
A. R-1 Residential District.
B. R-2 Residential District.
C. R-3 Residential District.
F. LI Light Industrial District.
G. PR Planned Development District (see Article
VI).
H. CC Central Corridor District.
(1) This district has been created to encourage adherence to the special
provisions and objectives of the 1989 Oakmont Boulevard Project, a
gift to the Borough by the Garden Club of Oakmont and accepted in
concept by the Council. The intent of creating the Central Corridor
District is to enhance and preserve a unique area of special visual
identity by influencing its future overall architecture, planning,
design and aesthetic quality. This will require a constant monitoring
of all change and improvements.
(2) The Oakmont Boulevard Project stresses the importance of attractive
landscaping as a part of the inviting environment and image of the
Central Corridor Area for the residents and commercial establishments,
as well as those passing through the community. The project stresses
the importance of developing a continuing program of improvements
and maintenance that will encourage landowners, businessmen and merchants
to invest in their properties. The Oakmont Boulevard Project is also
meant to be the catalyst for new development and improvements integrated
with many of Oakmont's positive amenities, such as community spirit,
quiet tree-lined streets, historic buildings, attractive residential
areas and riverfront location. Future use and control of the railroad
property shall be a major concern of the Borough of Oakmont.
I. MXD and MXD-2 Mixed Use Districts.
J. RO Riverfront Overlay District.
K. VPO View Protection Overlay.
Where uncertainty exists as to the boundaries of districts,
as shown on the official Zoning Map of the Borough of Oakmont, the
following rules shall apply:
A. Boundaries indicated as approximately following the center lines
of streets, highways or alleys shall be construed to follow such center
lines.
B. Boundaries indicated as approximately following platted lot lines
shall be construed as following such lot lines.
C. Boundaries indicated as approximately following Borough limits shall
be construed as following such Borough limits.
D. Boundaries indicated as following railroad tracks shall be construed
to be midway between the main tracks.
E. Boundaries indicated as following shorelines shall be construed to
follow such shorelines and, in the event of change in the shoreline,
shall be construed as moving with the actual shoreline.
F. Boundaries indicated as parallel to or extensions of features indicated in Subsections
A through
E above shall be so construed. Distances not specifically indicated on the official Zoning Map shall be determined by the scale of the illustration.
Where a district boundary line divides a lot held in single
and separate ownership at the effective date of this chapter, the
Zoning Officer may permit the extension of the regulations for either
portion of the lot not to exceed 50 feet beyond the district line
into the remaining portion of the lot.
NOTE: See also Attachment Charts (D-G) and Tables (1-2).
A. District purpose. It is the purpose of this District to implement
associated recommendations of the Oakmont Borough Comprehensive Plan.
B. Development regulations.
(1)
Site standards.
(a)
Minimum site area. In order to provide sufficient area for mixed
uses and a variety of housing types, no tentative plan shall be permitted
with a site area of less than 20 acres.
(b)
Maximum site density. The maximum number of dwelling units shall
not exceed 12 dwelling units per acre of the net site area, unless
otherwise permitted by this chapter and conditionally approved by
the Council based upon available infrastructure service.
(2)
Thoroughfare typology.
(a)
As authorized by the Pennsylvania Municipalities Planning Code, a hierarchy of thoroughfares shall be defined to establish
a typology of design and layout standards for pedestrian and vehicular
circulation within the Mixed Use District. This typology shall supersede
all other street or thoroughfare standards as established for other
zoning districts in the Borough only to the specific extent listed
here within.
(b)
To maintain the integrity of existing vehicular and pedestrian
circulation occurring throughout the Borough, the thoroughfare typology
shall consist of the following:
[3]
Neighborhood streets; and
(c)
To provide adequate circulation and to ensure pedestrian safety, the characteristics of each thoroughfare type shall be established according to the provisions provided in
Chart E, Thoroughfare Typology, and as illustrated in
Table 1, Thoroughfare Typology.
(d)
To further maintain the integrity of the Borough's existing
vehicular and pedestrian circulation, interconnections of compatible
volume capacity shall occur between existing and proposed streets.
[1]
The Borough's established street grid pattern shall be continued
into the Mixed Used District so that:
[a] Thoroughfares remain parallel and perpendicular
to the Allegheny River; and
[b] The characteristics of thoroughfares create an
environment consistent with that found in existing surrounding development.
[2]
Interconnections between thoroughfares of existing and proposed
development shall be required. Proposed thoroughfare designs shall
extend from their existing boundaries to a minimum of 400 feet within
the Mixed Use District.
(e)
View corridors.
[1]
View corridors shall be provided at any thoroughfare terminating
at the Allegheny River. View corridors, such as the extension of the
existing California Avenue, shall remain unimpeded.
[2]
Within a view corridor, public pedestrian access shall be provided
to the riverfront area.
(f)
Pedestrian circulation.
[1]
The design of pathways and sidewalks shall create a safe pedestrian
environment within the Mixed Use District. Pedestrian circulation
shall be separated from vehicular traffic.
[2]
Sidewalks shall, at a minimum, be provided within designated
public rights-of-way and should promote continuity and efficiency
of pedestrian circulation between existing and proposed thoroughfares.
[3]
The scale and placement of sidewalks shall be provided in accordance with
Chart E and
Table 1.
[4]
Where applicable, these standards shall supersede those established within Chapter
173, Streets and Sidewalk Regulations, and Chapter
182, Subdivision and Land Development.
(3)
Blocks.
(a)
The dimensions of blocks along the perimeter of the Mixed Use
District shall be consistent with the scale of adjacent existing development.
(b)
A standard block width shall be a minimum of 120 feet and a
maximum of 350 feet.
(c)
A standard block length shall be a minimum of 320 feet and a
maximum of 560 feet.
(d)
Blocks greater than 200 feet in width shall require the inclusion
of alleys at a minimum.
(4)
(a)
Five general principal building types shall be permitted within
the Mixed Use District. Basic building characteristics for these building
types shall be defined by provisions outlined in Charts E and F. Each general building type is intended to accommodate
a range of architectural products while responding to the reality
of changing market forces.
[1]
Type 1 includes building types such as single-family detached
dwellings with an attached garage or a detached garage.
[2]
Type 2 includes building types such as single-family detached dwellings with a zero lot line, commonly also called "side yard houses." See Subsection
B(5)(b).
[3]
Type 3 includes building types such as single-family attached
dwellings, including porchyard townhouses or dooryard townhouses.
[4]
Type 4 includes building types such as multifamily dwellings,
including courtyard apartments or multiuse structures, including shop
front apartments.
[5]
Type 5 includes nonresidential buildings such as marina, coffee
shop, medical or dental office or restaurants.
(b)
Use ratios.
[1]
A mixed use development shall be designed so that different
housing types are well integrated and based upon the pattern of development
in existing adjacent development. A development shall be particularly
sensitive to mixing uses or types of residential housing types (such
as single-family homes, duplexes, townhouses or apartments) along
the edges of the proposed development. Accordingly, a mixed use development
shall meet the following requirements:
[a] Residential use ratios.
[i]
A development shall include at least three different residential building types from those listed in Subsection
B(4)(a).
[ii]
To qualify as one of the three required building types, a building
type must comprise at least 10% of the total dwelling units of the
development.
[iii] A minimum of 15% of the dwelling units shall
be Type 1 buildings.
[iv]
A maximum of 50% of the dwelling units shall be Type 2 and/or
Type 3 buildings.
[v]
A maximum of 50% of the dwelling units shall be Type 4 buildings.
[b] Nonresidential use ratios. No more than 15% of
the net site area may consist of Type 5 buildings.
[c] Buildings of combined residential and nonresidential
use are encouraged to support neighborhood development.
(5)
Building setbacks.
(a)
Side and rear building setbacks shall be provided for each lot. Such setback dimensions shall be defined by
Chart F and
Table 2.
(b)
A zero-lot-line dwelling unit shall be permitted, on a lot,
with the following requirements:
[1]
The structure shall be erected conterminous with an interior
side lot line.
[2]
The wall of a structure erected conterminous with an interior
side lot line shall be solid and opaque with no openings of any kind.
[3]
The eaves of a structure may not extend across an interior side
lot line.
(c)
For the purposes of enabling the owner of a zero-lot-line dwelling
to conduct maintenance and repair to such structure, a five-foot-wide
maintenance easement located on the lot abutting the zero lot line
dwelling shall be recorded as part of the deed for the dwelling. Such
easement shall be an acknowledgement of the agreement with the homeowner
or landowners' association and the abutting landowner.
(6)
Building height.
(a)
The minimum and maximum height of a principal building shall be computed at the front facade of the building as per the dimensions outlined in
Table 1 and
Chart E. The Borough encourages the use of the maximum building
height for all corner lots.
(7)
Building length.
(a)
The maximum length of a building, or a series of buildings,
containing single-family residential uses shall be 160 feet.
(b)
The maximum length of a building, or a series of buildings,
containing multifamily uses and/or nonresidential uses shall be 320
feet.
(c)
A garage entry may not face a neighborhood street unless it
is a minimum of 20 feet behind the front building face of the principal
building.
(d)
A porch, stoop and/or balcony is encouraged to be attached to
each single-family dwelling and shall not be calculated as part of
the building's gross floor area. The relationships of these structures
to the thoroughfare and various building types shall be provided in
accordance with Tables 1 and 2.
(e)
Nonresidential uses are encouraged to be sited on corner lots
or, in the case of multiuse buildings with commerce, on the ground-floor
corner of the building.
(8)
Accessory buildings.
(a)
The location and setbacks relevant to accessory buildings shall
be as defined by Charts E and F and Tables 1 and 2.
(9)
Garages.
(a)
The maximum height of a flat-roofed garage is limited to 15
feet and the maximum height of a peak-roofed garage is limited to
18 feet.
(b)
The maximum gross floor area shall be 600 square feet.
(10)
(b)
When a commercial use abuts a residential zone not separated
by an alley or a road, special consideration shall be given to lighting,
screening and noise levels so as not to interfere with or restrict
the lawful use and enjoyment by others of their property. Additional
buffer may be recommended in each particular conditional use or special
exception depending on proposed use and as determined by the appropriate
reviewing body.
(11)
Lots.
(a)
Lot dimensions.
[1] The scale, along with width and depth requirements,
associated with each lot shall be created to support its development
and to complement surrounding lots.
[2] The minimum width of an interior lot shall be 16
feet.
[3] The minimum width of a corner lot shall be 24 feet.
[4] The minimum depth of a lot shall be 125 feet.
(b)
To complement the character of existing surrounding Borough development, the overall width of a lot should be based upon increments of the minimum interior lot width defined by Subsection
B(11)(a).
(12)
Relationship of thoroughfares and buildings.
(a)
Thoroughfares shall be located to promote interconnectivity
and to sustain density and intensity along rights-of-way throughout
the development.
[1] The relationships between buildings and thoroughfares shall be defined in accordance with
Chart G, Permitted Building Types by Thoroughfare.
[2] Such relationships shall provide adequate air and
light as well as ensure compatible densities.
(b)
In general, similar building types with compatible architectural
scales should front both sides of a thoroughfare. Dissimilar land
uses should abut rear lot lines or across alleys.
(13)
Permitted land uses: see Chart C.
(14)
Common open space and landscaping requirements.
(a)
Common open space.
[1] Common open space shall be a focus of the Mixed
Use District. Consequently, common open space shall be provided for
public use for the purposes of community gatherings, landmarks and
organizing elements within the district.
(b)
General requirements.
[1] Common open space, passive urban parks and recreation
open space land shall be deed restricted or placed within a trust
or conservancy to prohibit future subdivision or development.
[2] Common open space and passive urban parks shall
generally be designed to abut or connect to adjacent or potential
open space parcels to create an integral natural and/or urban greenway
system.
[3] A pedestrian path system of sidewalks and trails,
as appropriate, shall be designed to connect residential areas, commercial
areas, passive urban parks and common open space.
[4] In addition to the mix of use ratios, a mixed use
development shall provide the following three amenities which are
essential to supporting development at higher densities: common open
space; passive urban parks; and recreation open space depending upon
the density of each phase of development.
[a] Common open space shall be provided at a minimum
of 10% of the gross site area and shall be allocated to and remain
passive common open space in perpetuity. The passive common open space
shall typically comprise environmentally sensitive areas, including
wetlands, streams, mature woodlands, identified floodplain, slopes
in excess of 25% and historic, archeological or cultural features
when practical. Should the landowner and/or developer dedicate and
the Borough accept all or a portion of the required 10% passive common
open space for public park use, the dedicated acreage will be counted
toward fulfilling this requirement. Rights-of-way shall not be included
within the calculation of required common open space.
[b] Passive urban parks shall be provided at a rate
of 0.0025 acre per dwelling unit and shall be calculated in addition
to the required 10% common open space. Urban parks shall remain in
perpetuity.
[c] Passive urban parks shall be located on a generally
flat buildable land and scattered throughout the mixed use development
to provide convenient access by residents in the various neighborhood
areas.
[d] The urban parks shall be designed as passive shaded
areas with defined pedestrian connections to sidewalks, park benches
and other street furniture. Formal gardens and plantings shall be
included around a central public space. Open grass areas shall also
be featured to provide opportunities for unrestricted play.
(15)
Recreation open space.
(a)
Recreation open space shall be provided at a minimum of 10%
of the gross site area. Rights-of-way shall not be included in the
calculation of required recreation open space.
(b)
Vehicular access shall be easily and safely accessible from
all areas of the development, have adequate ingress and egress (including
meeting applicable site distance and other standard requirements)
and have a minimum of 75 feet of frontage on a public or proposed
public street.
(c)
Location shall be centrally located within the development site,
on a single parcel or contiguous parcels of land, which may not be
divided by any public or private street(s) or other right(s)-of-way.
(d)
Size and shape. Size and shape shall be suitable for development
as a park, and no single side of the land shall amount to more than
35% of the perimeter.
(e)
Maximum finished slope and land disturbance. The finished grade
shall have a slope of 4% or less.
(f)
Pedestrian access shall be accessible to each dwelling unit
in the development via pedestrian easement or dedicated rights-of-way
with sidewalks.
(g)
Riverfront access shall be provided with pedestrian connections
to the Allegheny Riverfront and strengthen the sense of community.
(h)
Utilities and vegetation shall be in reasonable proximity to
utilities, including water, sanitary sewer, electric, and shall have
established vegetation thereon.
(i)
Use limitations shall be free from encumbrances or liens which
would prevent, limit or restrict its use in any way.
(j)
Recreation open space shall not include areas defined as wetlands
by either the Army Corps of Engineers or the Pennsylvania Department
of Environmental Protection.
(k)
Recreation open space shall not include any areas defined as
floodplains, including floodway and floodway fringe areas, by the
Federal Emergency Management Agency.
(l)
Utility easements. Not more than 15% can be encumbered by utility
easements other than those servicing the parcel.
(m)
Timing of dedication: shall be deeded to the Borough at the
time of recording of the final plat. If a plat is developed and constructed
in phases, the land proposed for dedication to the public shall be
deeded to the Borough, together with the recording of the final plat
containing the land being dedicated and shall be dedicated and deeded
to the Borough not later than the phase when the total cumulative
percentage of lots or dwelling units approved for recording in the
phases of the plat reaches 35% of the total lots or dwelling units
in all phases of the plat or land development granted preliminary
approval.
(n)
The potential to gain increased development opportunity in the
Mixed Use District is related to the provision of open space. The
following minimum percentage of recreation open space may be applied
to the overall development in order to increase the amount of permitted
floor area or residential density within the development:
[1] Twelve percent of the site area for recreation
open space equals 2% floor area increase or 0.5 dwelling unit per
acre.
[2] Fifteen percent of the site area for recreation
open space equals 5% floor area increase or one dwelling unit per
acre.
[3] Twenty percent of the site area for recreation
open space equals 10% floor area increase or two dwelling units per
acre.
(16)
Ownership and maintenance.
(a)
The landowner and/or developer shall establish a land/homeowners'
association(s) in accordance with the following provisions:
[1] The association shall be established as an incorporated
organization(s) operating under recorded covenants and deeds.
[2] The association shall be created and implemented
in accordance with the requirements of the Municipalities Planning
Code, 53 P.S. § 10101 et seq., and the Uniform Planned Communities
Act, 68 Pa.C.S.A. § 5101 et seq., with the primary purpose
of maintaining the common open space and any common facilities.
(b)
The association declaration of covenants, conditions and restrictions
shall, as a minimum, establish the following:
[1] Identifying information: name of community, county,
legal description of real estate, description of boundaries of each
unit, maximum number of units, description of facilities to be owned
by the association, description of facilities to be operated by the
association.
[2] Easements or license rights to common open space
and facilities: a statement of each unit owner's rights or license
to the use and enjoyment of common open space and facilities, and
prohibitions against encroachment on or over common elements, or alteration
of common elements inconsistent with approved plans.
[3] Description of obligations of the association to
the members and to preserve common open space.
[4] Transfer of common open space and facilities: identification
of the method of transfer of common open space or facilities from
the developer, landowner or declarant to the association, a statement
that such transfer will be free of any encumbrances, identification
of any consideration required upon transfer from the developer, landowner
or declarant, timing of transfer to the association, no later than
the date the last unit is conveyed, a statement that the conveyance
will be binding upon any successors of the developer, landowner or
declarant, a statement that transfer will not occur until the facility
improvements have been completed unless there is a third-party guarantee
of completion to the association.
[5] Description of membership and voting rights of
each unit member, including any distinction between membership classes.
[6] If the developer or landowner proposes to construct
the project over a period of separate phases, the association shall
also be implemented in phases consistent with the development time
schedule.
(c)
The developer, landowner or association of common open space
shall provide all relevant bonds/agreements to the Borough to ensure
that the common open space shall be properly maintained. Also, to
ensure proper maintenance, the developer or landowner shall place
funds in escrow with the Borough for the purposes of future maintenance
costs, as determined by the Borough Engineer. A minimum of one easement
shall be defined for such open space to enable the Borough to access
such space for necessary maintenance at any time.
(d)
The Borough reserves the right to decline ownership and maintenance
responsibility for the common open space proposed for public dedication
if said open space is not consistent with the comprehensive planning-related
activities or for other community development objectives or reasons.
(e)
In the event that the organization established to own and maintain
common open space or any successor organization shall at any time
after establishment of the development fail to maintain the common
open space in reasonable order and condition in accordance with the
development plan, the Borough shall serve written notice upon such
organization or upon the residents of the development setting forth
the manner in which the organization has failed to maintain the common
open space in reasonable condition.
(f)
If the deficiencies set forth in the original notice or in the
modifications thereof shall not be corrected within the time period
defined by the Borough, in order to preserve the quality and vibrancy
of the properties within the development and to prevent the common
open space from becoming a public nuisance, the Borough may enter
upon the common open space to perform maintenance as necessary. The
maintenance performed by the Borough shall not constitute a taking
of the common open space nor vest in the public any rights to use
the same.
(g)
The pro-rata cost of such maintenance by the Borough shall be
assessed ratably against the properties within the development that
have a right of enjoyment of the common open space and shall become
a lien on the properties. The Borough at the time of entering the
common open space for the purpose of maintenance shall file a notice
of lien with the appropriate county office upon the properties affected
by the lien within the development.
(17)
Landscaping.
(a)
Street tree plantings along boulevards shall be spaced between
40 feet and 50 feet on center. Species and size of street trees shall
be selected and installed in accordance with the requirements within
the Shade Tree Ordinance and in consultation with the Shade Tree Commission.
(b)
Street tree plantings along urban and neighborhood streets shall
be spaced between 30 feet and 40 feet on center. Species and size
of street trees shall be selected and installed in accordance with
the requirements within the Shade Tree Ordinance and in consultation
with the Shade Tree Commission.
(18)
Parking and loading.
(a)
See Article
VIII for the calculation of parking and loading requirements associated with proposed development and land uses.
(b)
No activity on shipping or receiving docks, bays or lots shall
be permitted within 100 feet of an abutting R-1, R-2 or R-3 District
between the hours of 9:00 p.m. and 6:00 a.m. Shipping and receiving
docks, bays or lots shall be screened from view of adjacent properties
and streets. Methods for such screening shall include either the use
of landscaping, walls or fences with a minimum opacity of 80% and
a minimum height of eight feet.
(c)
Curb cuts and driveways for parking areas shall be determined based upon the provisions of
Chart E.
(d)
Within the Mixed Use District, parking shall be located at the
rear or side of a building. If located at the side, screening shall
be provided at the front and side lot lines by landscaping or decorative
walls or fences. Such screening shall be a minimum of three feet in
height and shall have a minimum opacity of 80%.
(e)
An open-air parking lot shall be screened from the street by
low hedges or walls not less than three feet and not more than five
feet in height. The minimum opacity of such hedges or walls shall
be 70%. Additional landscaping of trees within parking lots shall
be planted in accordance with the Subdivision and Land Development
Ordinance of the Borough.
(f)
Shared parking is encouraged especially in relation to any transit-oriented
development and/or development of a commuter rail station.
(g)
Areas used for primary circulation, for frequent idling of vehicle
engines or for loading activities shall be designed and located to
minimize impacts on adjoining lots, including provisions for screening
or baffling.
(19)
Service areas.
(a)
Dumpsters and permanently placed refuse receptacles must be
located at least 20 feet from adjacent residential uses. Dumpsters
shall be screened from view of adjacent properties and streets.
(b)
Screening of exterior equipment. To maintain the character and
integrity of surrounding neighborhood development, mechanical equipment,
including but not limited to electrical, HVAC, utility service and
communication devices, shall be screened by a masonry wall with a
minimum height of six feet or located on one of the following:
[1] Located on principal building rooftop; or
[2] Located within an accessory structure with the
method of enclosure and access to be approved by the Borough.
(c)
Rooftop mechanical equipment shall be screened from view. The
method of screening shall be subject to Borough review and approval.
C. Design enhancements. The Borough of Oakmont seeks to maximize infrastructure
investments and the use of developable land while continuing to provide
its residents quality development comparable to that which has previously
been constructed within the community and in the spirit of traditional
neighborhood development as permitted by the Pennsylvania Municipalities
Planning Code. To achieve this, a landowner and/or developer shall incorporate
a range of design components as part of proposed development within
the Mixed Use District.
(1)
Methods.
(a)
Architectural palette. An architectural palette for proposed
development shall be established. The architectural palette shall
address the following:
[1]
Architectural compatibility.
[4]
Encouragement of pedestrian activity.
[5]
Buildings that contain special architectural features to signify
entrances to development and important street intersections.
(b)
Facade and roof treatment.
[1]
Walls facing a public right-of-way shall be varied to reduce
the scale of large walls and to complement the character of existing
walls along boulevards within the Borough. Street-level facades at
these locations shall be designed to provide a pedestrian scale consistent
with that of development on existing Allegheny River Boulevard/Allegheny
Avenue. Facades shall employ the use of windows, variations of material,
entrances and other features along no less than 75% of their length.
[2]
The use of highly reflective surfaces, including reflective
glass and reflective metal roofs with a pitch of more than a run of
seven to a rise of 12, shall be prohibited. This prohibition does
not apply to solar panels and copper or painted metal roofs.
(c)
Ground floor transparency. To promote pedestrian safety and
promote a sense of community, nonresidential uses shall have 50% of
the wall surfaces at street level consist of clear glass windows and
doors to allow undisturbed view into the building.
(d)
Doorways and entrances. To increase pedestrian safety and enhance
circulation, principal entry doors shall be oriented toward a boulevard,
urban street or neighborhood street. They should also be recessed,
covered or otherwise clearly identifiable through the use of architectural
design elements and be well lighted.
(e)
Lighting. In addition to the requirements of §
205-701, the landowner and/or developer shall match the scaling of lighting fixtures with the scale of the street and development upon which they are located.
(f)
Site plan review. Site plan review shall be completed in accordance with §
205-602 and approval shall be granted in accordance with the provisions of this section.
(g)
Performance standards: see Borough of Oakmont Zoning Chapter Article
XI.
D. Coordination of development shall be done in accordance with flood
hazard areas as shown on applicable Allegheny County and federal flood
mapping.
NOTE: See also Attachment Charts (D-G) and Tables (1-2).
A. Development regulations.
(1)
Site standards.
(a)
Maximum site density. The maximum number of dwelling units shall
not exceed 12 dwelling units per acre of the net site area, unless
otherwise permitted by this chapter and conditionally approved by
the Council based upon available infrastructure service.
(2)
Thoroughfare typology.
(a)
As authorized by the Pennsylvania Municipalities Planning Code, a hierarchy of thoroughfares shall be defined to establish
a typology of design and layout standards for pedestrian and vehicular
circulation within the Mixed Use District. This typology shall supersede
all other street or thoroughfare standards as established for other
zoning districts in the Borough only to the specific extent listed
here within.
(b)
To maintain the integrity of existing vehicular and pedestrian
circulation occurring throughout the Borough, the thoroughfare typology
shall consist of the following:
[2]
Neighborhood streets; and
(c)
To provide adequate circulation and to ensure pedestrian safety, the characteristics of each thoroughfare type shall be established according to the provisions provided in
Chart E, Thoroughfare Typology, and as illustrated in
Table 1, Thoroughfare Typology.
(d)
To further maintain the integrity of the Borough's existing
vehicular and pedestrian circulation, interconnections of compatible
volume capacity shall occur between existing and proposed streets.
[1]
The Borough's established street grid pattern shall be continued
into the Mixed Used District so that:
[a] Thoroughfares remain parallel and perpendicular
to the Allegheny River; and
[b] The characteristics of thoroughfares create an
environment consistent with that found in existing surrounding development.
[2]
Interconnections between thoroughfares of existing and proposed
development shall be required. Proposed thoroughfare designs shall
extend from their existing boundaries to a minimum of 400 feet within
the Mixed Use District.
(e)
View corridors.
[1]
View corridors shall be provided at any thoroughfare terminating
at the Allegheny River. View corridors, such as the extension of the
existing California Avenue, shall remain unimpeded.
[2]
Within a view corridor, public pedestrian access shall be provided
to the riverfront area.
(f)
Pedestrian circulation.
[1]
The design of pathways and sidewalks shall create a safe pedestrian
environment within the Mixed Use District. Pedestrian circulation
shall be separated from vehicular traffic. Connections shall be made
with the Arboretum Trail where feasible.
[2]
Sidewalks shall, at a minimum, be provided within designated
public rights-of-way and should promote continuity and efficiency
of pedestrian circulation between existing and proposed thoroughfares.
[3]
The scale and placement of sidewalks shall be provided in accordance with
Chart E and
Table 1.
[4]
Where applicable, these standards shall supersede those established within Chapter
173, Streets and Sidewalk Regulations, and Chapter
182, Subdivision and Land Development.
(3)
Blocks.
(a)
The dimensions of blocks along the perimeter of the Mixed Use
District shall be consistent with the scale of adjacent existing development.
(b)
A standard block width shall be a minimum of 120 feet and a
maximum of 350 feet.
(c)
A standard block length shall be a minimum of 320 feet and a
maximum of 560 feet.
(d)
Blocks greater than 200 feet in width shall require the inclusion
of alleys at a minimum.
(4)
(a)
Five general principal building types shall be permitted within
the Mixed Use District. Basic building characteristics for these building
types shall be defined by provisions outlined in Charts E and F. Each general building type is intended to accommodate
a range of architectural products while responding to the reality
of changing market forces.
[1]
Type 1 includes building types such as single-family detached
dwellings with an attached garage or a detached garage.
[2]
Type 2 includes building types such as single-family detached
dwellings with a zero lot line, commonly also called "side yard houses."
See Subsection B(5)(b).
[3]
Type 3 includes building types such as single-family attached
dwellings, including porchyard townhouses or dooryard townhouses.
[4]
Type 4 includes building types such as multifamily dwellings,
including courtyard apartments or multiuse structures, including shop
front apartments.
[5]
Type 5 includes nonresidential buildings such as marina, coffee
shop, medical or dental office or restaurants.
(b)
Use ratios.
[1]
A mixed use development shall be designed so that different
housing types are well integrated and based upon the pattern of development
in existing adjacent development. A development shall be particularly
sensitive to mixing uses or types of residential housing types (such
as single-family homes, duplexes, townhouses or apartments) along
the edges of the proposed development. Accordingly, a mixed use development
shall meet the following requirements:
[a] Residential use ratios.
[i] A development shall include at least three different residential building types from those listed in Subsection
A(4)(a).
[ii] To qualify as one of the three required building
types, a building type must comprise at least 10% of the total dwelling
units of the development.
[iii] A minimum of 15% of the dwelling units shall
be Type 1 buildings.
[iv] A maximum of 50% of the dwelling units shall be
Type 2 and/or Type 3 buildings.
[v] A maximum of 50% of the dwelling units shall be
Type 4 buildings.
[b] Nonresidential use ratios. No more than 15% of
the net site area may consist of Type 5 buildings.
(5)
Building setbacks.
(a)
Side and rear building setbacks shall be provided for each lot. Such setback dimensions shall be defined by
Chart F and
Table 2.
(b)
A zero lot line dwelling unit shall be permitted, on a lot,
with the following requirements:
[1]
The structure shall be erected conterminous with an interior
side lot line.
[2]
The wall of a structure erected conterminous with an interior
side lot line shall be solid and opaque with no openings of any kind.
[3]
The eaves of a structure may not extend across the interior
side lot line.
(c)
For the purposes of enabling the owner of a zero lot line dwelling
to conduct maintenance and repair to such structure, a five-foot-wide
maintenance easement located on the lot abutting the zero lot line
dwelling shall be recorded as part of the deed for the dwelling. Such
easement shall be an acknowledgement of the agreement with the homeowner
or landowners' association and the abutting landowner.
(6)
Building height.
(a)
The minimum and maximum height of a principal building shall be computed at the front facade of the building as per the dimensions outlined in
Table 1 and
Chart E. The Borough encourages the use of the maximum building
height for all corner lots.
(7)
Building length.
(a)
The maximum length of a building, or a series of buildings,
containing single-family residential uses shall be 160 feet.
(b)
The maximum length of a building, or a series of buildings,
containing multifamily uses and/or nonresidential uses shall be 320
feet.
(c)
A garage entry may not face a neighborhood street unless it
is a minimum of 20 feet behind the front building face of the principal
building.
(d)
A porch, stoop and/or balcony is encouraged to be attached to
each single-family dwelling and shall not be calculated as part of
the building's gross floor area. The relationships of these structures
to the thoroughfare and various building types shall be provided in
accordance with Tables 1 and 2.
(e)
Nonresidential uses are encouraged to be sited on corner lots
or, in the case of multiuse buildings with commerce, on the ground-floor
corner of the building.
(8)
Accessory buildings.
(a)
The location and setbacks relevant to accessory buildings shall
be as defined by Charts E and F and Tables 1 and 2.
(9)
Garages.
(a)
The maximum height of a flat-roofed garage is limited to 15
feet and the maximum height of a peak-roofed garage is limited to
18 feet.
(b)
The maximum gross floor area shall be 600 square feet.
(10)
(b)
When a commercial use abuts a residential zone not separated
by an alley or a road, special consideration shall be given to lighting,
screening and noise levels so as not to interfere with or restrict
the lawful use and enjoyment by others of their property. Additional
buffer may be recommended in each particular conditional use or special
exception depending on proposed use and as determined by the appropriate
reviewing body.
(11)
Lots.
(a)
Lot dimensions.
[1] The scale, along with width and depth requirements,
associated with each lot shall be created to support its development
and to complement surrounding lots.
[2] The minimum width of an interior lot shall be 16
feet.
[3] The minimum width of a corner lot shall be 24 feet.
[4] The minimum depth of a lot shall be 125 feet.
(b)
To complement the character of existing surrounding Borough
development, the overall width of a lot should be based upon increments
of the minimum interior lot width defined by Subsection B(11)(a).
(12)
Relationship of thoroughfares and buildings.
(a)
Thoroughfares shall be located to promote interconnectivity
and to sustain density and intensity along rights-of-way throughout
the development.
[1] The relationships between buildings and thoroughfares shall be defined in accordance with
Chart G, Permitted Building Types by Thoroughfare.
[2] Such relationships shall provide adequate air and
light as well as ensure compatible densities.
(b)
In general, similar building types with compatible architectural
scales should front both sides of a thoroughfare. Dissimilar land
uses should abut rear lot lines or across alleys.
(13)
Permitted land uses: see Chart C.
(14)
Common open space.
(a)
Common open space.
[1] Common open space shall be a focus of the Mixed
Use District. Consequently, common open space shall be provided for
public use for the purposes of community gatherings, landmarks and
organizing elements within the district.
[2] Common open space requirements do not need to be
met for development within 200 feet of Plum Creek as measured from
the top of the bank under normal water conditions.
(b)
General requirements.
[1] Common open space, passive urban parks and recreation
open space land shall be deed restricted or placed within a trust
or conservancy to prohibit future subdivision or development.
[2] Common open space and passive urban parks shall
generally be designed to abut or connect to adjacent or potential
open space parcels to create an integral natural and/or urban greenway
system.
[3] A pedestrian path system of sidewalks and trails,
as appropriate, shall be designed to connect residential areas, commercial
areas, passive urban parks and common open space.
[4] In addition to the mix of use ratios, a mixed use
development shall provide the following three amenities which are
essential to supporting development at higher densities: common open
space; passive urban parks; and recreation open space depending upon
the density of each phase of development.
[a] Common open space shall be provided at a minimum
of 10% of the gross site area and shall be allocated to and remain
passive common open space in perpetuity. The passive common open space
shall typically comprise environmentally sensitive areas, including
wetlands, streams, mature woodlands, identified floodplain, slopes
in excess of 25% and historic, archeological or cultural features
when practical. Should the landowner and/or developer dedicate and
the Borough accept all or a portion of the required 10% passive common
open space for public park use, the dedicated acreage will be counted
toward fulfilling this requirement. Rights-of-way shall not be included
within the calculation of required common open space.
[b] Passive urban parks shall be provided at a rate
of 0.0025 acre per dwelling unit and shall be calculated in addition
to the required 10% common open space. Urban parks shall remain in
perpetuity.
[c] Passive urban parks shall be located on a generally
flat buildable land and scattered throughout the mixed use development
to provide convenient access by residents in the various neighborhood
areas.
[d] The urban parks shall be designed as passive shaded
areas with defined pedestrian connections to sidewalks, park benches
and other street furniture. Formal gardens and plantings shall be
included around a central public space. Open grass areas shall also
be featured to provide opportunities for unrestricted play.
(15)
Recreation open space.
(a)
Recreation open space shall be provided at a minimum of 10%
of the gross site area. Rights-of-way shall not be included in the
calculation of required recreation open space.
[1] Recreation open space requirements do not need
to be met for development within 200 feet of Plum Creek as measured
from the top of the bank under normal water conditions.
(b)
Vehicular access shall be easily and safely accessible from
all areas of the development, have adequate ingress and egress (including
meeting applicable site distance and other standard requirements)
and have a minimum of 75 feet of frontage on a public or proposed
public street.
(c)
Location shall be centrally located within the development site,
on a single parcel or contiguous parcels of land, which may not be
divided by any public or private street(s) or other right(s)-of-way.
(d)
Size and shape. Size and shape shall be suitable for development
as a park, and no single side of the land shall amount to more than
35% of the perimeter.
(e)
Maximum finished slope and land disturbance. The finished grade
shall have a slope of 4% or less.
(f)
Pedestrian access shall be accessible to each dwelling unit
in the development via pedestrian easement or dedicated rights-of-way
with sidewalks.
(g)
Riverfront access shall be provided with pedestrian connections
to the Allegheny Riverfront and strengthen the sense of community.
(h)
Utilities and vegetation shall be in reasonable proximity to
utilities, including water, sanitary sewer, electric, and shall have
established vegetation thereon.
(i)
Use limitations shall be free from encumbrances or liens which
would prevent, limit or restrict its use in any way.
(j)
Recreation open space shall not include areas defined as wetlands
by either the Army Corps of Engineers or the Pennsylvania Department
of Environmental Protection.
(k)
Recreation open space shall not include any areas defined as
floodplains, including floodway and floodway fringe areas, by the
Federal Emergency Management Agency.
(l)
Utility easements. Not more than 15% can be encumbered by utility
easements other than those servicing the parcel.
(m)
Timing of dedication: shall be deeded to the Borough at the
time of recording of the final plat. If a plat is developed and constructed
in phases, the land proposed for dedication to the public shall be
deeded to the Borough, together with the recording of the final plat
containing the land being dedicated and shall be dedicated and deeded
to the Borough not later than the phase when the total cumulative
percentage of lots or dwelling units approved for recording in the
phases of the plat reaches 35% of the total lots or dwelling units
in all phases of the plat or land development granted preliminary
approval.
(n)
The potential to gain increased development opportunity in the
Mixed Use District is related to the provision of open space. The
following minimum percentage of recreation open space may be applied
to the overall development in order to increase the amount of permitted
floor area or residential density within the development:
[1] Twelve percent of the site area for recreation
open space equals 2% floor area increase or 0.5 dwelling unit per
acre.
[2] Fifteen percent of the site area for recreation
open space equals 5% floor area increase or one dwelling unit per
acre.
[3] Twenty percent of the site area for recreation
open space equals 10% floor area increase or two dwelling units per
acre.
(o)
In accordance with the Borough's regulations, a fee, as determined
by the Borough, may be paid if a dedication is not made.
(16)
Plum Creek.
(a)
To the maximum extent feasible, any new construction or development
on a site which is partially within a floodway shall be located on
portions of the site which are not within the floodway.
(b)
To the maximum extent possible, in maintaining the character
and use of adjacent areas, public access to the creek shall be provided
in connection with any new development or construction.
(c)
Borough Council may impose additional restrictions reasonably
necessary to protect the health, safety or welfare; to protect the
capacity of any floodplain areas; and to improve or maintain the scenic
quality of Plum Creek.
(d)
The Borough Council may grant an increase in density to the
lot(s) if the construction of unencumbered pedestrian access for the
entire length of the lot(s) is provided adjacent to Plum Creek.
(17)
Ownership and maintenance.
(a)
As needed, the landowner and/or developer shall establish a
land/homeowners' association(s) in accordance with the following provisions:
[1] The association shall be established as an incorporated
organization(s) operating under recorded covenants and deeds.
[2] The association shall be created and implemented
in accordance with the requirements of the Municipalities Planning
Code, 53 P.S. § 10101 et seq., and the Uniform Planned Communities
Act, 68 Pa.C.S.A. § 5101 et seq., with the primary purpose
of maintaining the common open space and any common facilities.
(b)
The landowner, developer and/or association declaration of covenants,
conditions and restrictions shall, as a minimum, establish the following:
[1] Identifying information: name of community, county,
legal description of real estate, description of boundaries of each
unit, maximum number of units, description of facilities to be owned
by the association, description of facilities to be operated by the
association.
[2] Easements or license rights to common open space
and facilities: a statement of each unit owner's rights or license
to the use and enjoyment of common open space and facilities, and
prohibitions against encroachment on or over common elements, or alteration
of common elements inconsistent with approved plans.
[3] Description of obligations of the association to
the members and to preserve common open space.
[4] Transfer of common open space and facilities: identification
of the method of transfer of common open space or facilities from
the developer, landowner or declarant to the association, a statement
that such transfer will be free of any encumbrances, identification
of any consideration required upon transfer from the developer, landowner
or declarant, timing of transfer to the association, no later than
the date the last unit is conveyed, a statement that the conveyance
will be binding upon any successors of the developer, landowner or
declarant, a statement that transfer will not occur until the facility
improvements have been completed unless there is a third-party guarantee
of completion to the association.
[5] Description of membership and voting rights of
each unit member, including any distinction between membership classes.
[6] If the developer or landowner proposes to construct
the project over a period of separate phases, the association shall
also be implemented in phases consistent with the development time
schedule.
(c)
The developer, landowner or association of common open space
shall provide all relevant bonds/agreements to the Borough to ensure
that the common open space shall be properly maintained. Also, to
ensure proper maintenance, the developer or landowner shall place
funds in escrow with the Borough for the purposes of future maintenance
costs, as determined by the Borough Engineer. A minimum of one easement
shall be defined for such open space to enable the Borough to access
such space for necessary maintenance at any time.
(d)
The Borough reserves the right to decline ownership and maintenance
responsibility for the common open space proposed for public dedication
if said open space is not consistent with the comprehensive planning-related
activities or for other community development objectives or reasons.
(e)
In the event that the organization established to own and maintain
common open space or any successor organization shall at any time
after establishment of the development fail to maintain the common
open space in reasonable order and condition in accordance with the
development plan, the Borough shall serve written notice upon such
organization or upon the residents of the development setting forth
the manner in which the organization has failed to maintain the common
open space in reasonable condition.
(f)
If the deficiencies set forth in the original notice or in the
modifications thereof shall not be corrected within the time period
defined by the Borough, in order to preserve the quality and vibrancy
of the properties within the development and to prevent the common
open space from becoming a public nuisance, the Borough may enter
upon the common open space to perform maintenance as necessary. The
maintenance performed by the Borough shall not constitute a taking
of the common open space nor vest in the public any rights to use
the same.
(g)
The pro-rata cost of such maintenance by the Borough shall be
assessed ratably against the properties within the development that
have a right of enjoyment of the common open space and shall become
a lien on the properties. The Borough at the time of entering the
common open space for the purpose of maintenance shall file a notice
of lien with the appropriate county office upon the properties affected
by the lien within the development.
(18)
Landscaping.
(a)
Street tree plantings along boulevards shall be spaced between
40 feet and 50 feet on center. Species and size of street trees shall
be selected and installed in accordance with the requirements within
the Shade Tree Ordinance and in consultation with the Shade Tree Commission.
(b)
Street tree plantings along urban and neighborhood streets shall
be spaced between 30 feet and 40 feet on center. Species and size
of street trees shall be selected and installed in accordance with
the requirements within the Shade Tree Ordinance and in consultation
with the Shade Tree Commission.
(19)
Parking and loading.
(a)
See Article
VIII for the calculation of parking and loading requirements associated with proposed development and land uses.
(b)
No activity on shipping or receiving docks, bays or lots shall
be permitted within 100 feet of an abutting R-1, R-2 or R-3 District
between the hours of 9:00 p.m. and 6:00 a.m. Shipping and receiving
docks, bays or lots shall be screened from view of adjacent properties
and streets. Methods for such screening shall include either the use
of landscaping, walls or fences with a minimum opacity of 80% and
a minimum height of eight feet.
(c)
Curb cuts and driveways for parking areas shall be determined based upon the provisions of
Chart E.
(d)
Within the Mixed Use District, parking shall be located at the
rear or side of a building. If located at the side, screening shall
be provided at the front and side lot lines by landscaping or decorative
walls or fences. Such screening shall be a minimum of three feet in
height and shall have a minimum opacity of 80%.
(e)
An open-air parking lot shall be screened from the street by
low hedges or walls not less than three feet and not more than five
feet in height. The minimum opacity of such hedges or walls shall
be 70%. Additional landscaping of trees within parking lots shall
be planted in accordance with the Subdivision and Land Development
Ordinance of the Borough.
(f)
Shared parking is encouraged especially in relation to any transit-oriented
development and/or development of a commuter rail station.
(g)
Areas used for primary circulation, for frequent idling of vehicle
engines or for loading activities shall be designed and located to
minimize impacts on adjoining lots, including provisions for screening
or baffling.
(20)
Service areas.
(a)
Dumpsters and permanently placed refuse receptacles must be
located at least 20 feet from adjacent residential uses. Dumpsters
shall be screened from view of adjacent properties and streets.
(b)
Screening of exterior equipment. To maintain the character and
integrity of surrounding neighborhood development, mechanical equipment,
including but not limited to electrical, HVAC, utility service and
communication devices, shall be screened by a masonry wall with a
minimum height of six feet or located on one of the following:
[1] Located on principal building rooftop; or
[2] Located within an accessory structure with the
method of enclosure and access to be approved by the Borough.
(c)
Rooftop mechanical equipment shall be screened from view. The
method of screening shall be subject to Borough review and approval.
(d)
See
Table 1: Thoroughfare Typology and
Table 2: Building Typology in the Attachments section.
B. Design enhancements. The Borough of Oakmont seeks to maximize infrastructure
investments and the use of developable land while continuing to provide
its residents quality development comparable to that which has previously
been constructed within the community and in the spirit of traditional
neighborhood development as permitted by the Pennsylvania Municipalities
Planning Code. To achieve this, a landowner and/or developer shall incorporate
a range of design components as part of proposed development within
the Mixed Use District.
(1)
Methods.
(a)
Architectural palette. An architectural palette for proposed
development shall be established. The architectural palette shall
address the following:
[1]
Architectural compatibility.
[4]
Encouragement of pedestrian activity.
[5]
Buildings that contain special architectural features to signify
entrances to development and important street intersections.
(b)
Facade and roof treatment.
[1]
Walls facing a public right-of-way shall be varied to reduce
the scale of large walls and to complement the character of existing
walls along boulevards within the Borough. Street-level facades at
these locations shall be designed to provide a pedestrian scale consistent
with that of development on existing Allegheny River Boulevard/Allegheny
Avenue. Facades shall employ the use of windows, variations of material,
entrances and other features along no less than 75% of their length.
[2]
The use of highly reflective surfaces, including reflective
glass and reflective metal roofs with a pitch of more than a run of
seven to a rise of 12, shall be prohibited. This prohibition does
not apply to solar panels and copper or painted metal roofs.
(c)
Ground floor transparency. To promote pedestrian safety and
promote a sense of community, nonresidential uses shall have 50% of
the wall surfaces at street level consist of clear glass windows and
doors to allow undisturbed view into the building.
(d)
Doorways and entrances. To increase pedestrian safety and enhance
circulation, principal entry doors shall be oriented toward a boulevard,
urban street or neighborhood street. They should also be recessed,
covered or otherwise clearly identifiable through the use of architectural
design elements and be well lighted.
(e)
Lighting. In addition to the requirements of §
205-701, the landowner and/or developer shall match the scaling of lighting fixtures with the scale of the street and development upon which they are located.
(f)
Site plan review. Site plan review shall be completed in accordance with §
205-602, and approval shall be granted in accordance with the provisions of this section.
(g)
Performance standards: see Borough of Oakmont Zoning Chapter Article
XI.
C. Coordination of development shall be done in accordance with flood
hazard areas as shown on applicable Allegheny County and federal flood
mapping.
Note: See §
205-708. Any landowner and any person engaged in the alteration or development of land which may affect stormwater runoff characteristics shall implement such measures as are reasonably necessary to prevent injury to health, safety or other property. Control measures shall include such actions as are required:
A. To assure that the maximum rate of stormwater runoff is no greater
after development than prior to development activities.
B. To manage the quantity, velocity and direction of resulting stormwater
runoff in a manner which otherwise adequately protects health and
property from possible injury.
[Amended 2-18-2019 by Ord. No. O6-2019]
A. A permanent in-ground or aboveground private residential swimming pool, accessory to a one-family or two-family dwelling, may be located within a required rear yard, but shall not extend closer than 15 feet to a rear lot line and shall not extend closer to a side lot line than the required side yard depth. An in-ground pool shall be enclosed with fencing and gates/latching as required by the Borough Code (Chapter
186), International Residential Code and/or Uniform Construction Code, as applicable.
B. See also Borough Code Chapter
186, Swimming Pools.
The Borough of Oakmont has determined that private satellite
earth station antennas over two feet in diameter impact upon the surrounding
neighborhood to a greater extent than other antennas and are hereby
regulated as follows:
A. Satellite earth station antennas over two feet in diameter may not
be erected on any part of a principal or accessory structure nor on
the buildable area of a lot between the front yard and a line parallel
to the front line of the principal structure on the lot nor in the
buildable area of the lot between the side yard and the principal
structure on the lot.
Windmills, windwheels, or wind energy conversion systems (WECS)
shall be permitted in all zoning districts, subject to the following
conditions:
A. No said systems or equipment shall be erected in a front yard or
within the area between a front lot line and the front building facade
of the principal building on the lot.
B. The structure supporting the wind rotor unit, including any necessary
guideposts and supporting cables, shall be independent of any occupied
structure and shall not be more than 45 feet in height.
C. The minimum distance between grade and the lowest point of the rotor
blade shall be 20 feet.
D. All electric lines/utility wires shall be buried underground.
E. Any mechanical equipment associated and necessary for operation,
including a building for batteries and storage cells, shall be enclosed
by a six-foot fence with screening planting in accordance with this
chapter. The supporting structure shall also be enclosed by a six-foot
fence, unless the base of the tower is not climbable for a distance
of 12 feet.
F. When a building is necessary for storage cells or related mechanical
equipment, the building shall not exceed 140 square feet.
G. One windmill, windwheel or WECS shall be permitted per lot.
H. The resultant energy harnessed from the wind shall not be used on
property other than that on which located, unless all applicable cogeneration
requirements are met.
I. The supporting structure and generating unit shall be kept in good
repair and sound condition. Upon abandonment of use, the supporting
structure and related structures shall be dismantled and removed from
the property within 60 days.
J. The applicant shall demonstrate that any noise from the wind-generating
unit shall not exceed 45 dBA measured at the property line.
(1)
A "decibel" shall mean a unit for measuring the relative intensity
of sounds. More specifically, a unit for expressing the ratio of two
amounts of acoustic signal power equal to 10 times the common logarithm
of this ratio.
(2)
A "weighted" sound level shall mean the total sound level in
decibels of all sound as measured with a sound level meter with a
reference pressure of 20 micropascals using the "A" weighted network
(scale) at slow response. The unit of measurement shall be defined
as dB(A).