In all districts, all uses and activities established after the effective date of this chapter shall comply with the following standards; all existing uses and activities in compliance with the following standards on the effective date of this chapter shall continue in compliance; and all existing uses and activities not in compliance with §§
325-58 through
325-63 on the effective date of this chapter shall, within two years following the effective date of this chapter, bring themselves into compliance.
No use shall cause vibrations exceeding the
maximum values specified in this section. The maximum vibration is
given as particle velocity, which may be measured directly with suitable
instrumentation or computed on the basis of displacement and frequency.
When computed the following formula shall be used:
PV
|
=
|
4.28 F x D
|
Where
|
PV
|
=
|
Particle velocity, inches per second
|
F
|
=
|
Vibration frequency, cycles per second
|
D
|
=
|
Single amplitude displacement of the vibration
inches
|
Particle velocity shall be the vector sum of
three individual components measured simultaneously in three mutually
perpendicular directions.
|
Maximum Ground Transmitted Vibration
|
---|
|
Particle Velocity (in inches/second)
|
---|
Zoning District
|
Adjacent Lot Line
|
Residential District
|
---|
Residential
|
0.05
|
0.02
|
Commercial
|
0.10
|
0.02
|
Industrial
|
0.20
|
0.02
|
Where vibration is produced as discrete impulses
and such impulses do not exceed a frequency of 60 per minute, then
the values in this table may be multiplied by two.
|
No heat from any use shall be sensed at any
property line to the extent of raising the temperature of air or materials
more than 1° F.
In commercial and industrial districts, any
operation or activity-producing glare shall be conducted so that direct
or indirect light from the source shall not cause illumination in
excess of 0.5 footcandles when measured in residential or special
district.
All operations, activities and uses shall be
conducted so as to comply with the performance standards governing
fire and explosion hazards prescribed below. Such uses shall also
comply with the rules and regulations of the currently effective Fire
Code of the Township of Ridley and with the regulations of the Department of Labor and
Industry.
A. Detonable materials. Activities involving the storage,
utilization or manufacture of products which decompose by detonation
shall be in accordance with the regulations of each district. Such
materials shall include, but are not limited to: all primary explosives
such as lead azide, lead styphnate, fulminates and tetracene; all
high explosives such as TNT, RDX, HMX, PETN and picric acid; propellants
and components thereof such as dry nitrocellulose, black powder, boron
hydrides, hydrazine and its derivatives; pyrotechnics and fireworks
such as magnesium powder, potassium chlorate and potassium nitrate;
blasting explosives such as dynamite and nitroglycerine; unstable
organic compounds such as acetylides, tetraxoles and ozonides; unstable
oxidizing agents such as perchloric acid, perchlorates and hydrogen
peroxide in concentration greater than 35%; and nuclear fuels, fissionable
materials and products and reactor elements such as Uranium 235 and
Plutonium 239.
(1) Residential, commercial and special districts. No
storage or manufacture of materials or products which decompose by
detonation is permitted.
(2) Industrial districts. The storage or manufacture of
materials or products which decompose by detonation is limited to
five pounds. Quantities in excess of five pounds of such materials
may be stored but not manufactured only when permitted in accordance
with the effective Fire Code.
(3) Utilization. In all districts, the utilization of
materials or products which decompose by detonation shall be permitted
only when in accordance with the effective Fire Code.
B. Fire hazards, solids. The regulations of the Department
of Labor and Industry of the Commonwealth of Pennsylvania shall apply.
In addition thereto shall apply:
(1) Residential and special districts. The storage, utilization
or manufacture of solid materials which are active to intense burning
shall not be conducted in any residential or special district.
(2) Commercial. The storage, utilization or manufacture
of solid materials which are active to intense burning shall be conducted
within spaces having fire resistive construction of no less than two
hours and protected with an automatic fire extinguishing system.
(3) Industrial districts. The storage, utilization or
manufacture of solid materials which are active to intense burning
shall be conducted within walls having a fire resistance no less than
two hours or protected by an automatic fire extinguishing system or
the building wall shall be no less than 25 feet from all lot lines.
The outdoor storage of such materials shall be permitted no closer
than 40 feet from all lot lines.
C. Fire hazards, liquids and gases. The regulations of
the Department of Labor and Industry of the Commonwealth of Pennsylvania
shall apply. In addition thereto shall apply:
(1) The storage, utilization or manufacture of flammable
liquids or gases which produce flammable or explosive vapor shall
be permitted only in accordance with this section, exclusive of the
storage of finished products in original sealed containers (60 gallons
or less) which shall be unrestricted.
(2) The total storage capacity of flammable liquids and
gases shall not exceed those quantities permitted in the following
table for each of the districts indicated but no other.
|
Liquids (Gallons)
|
---|
|
|
Above-Ground Flash Points*
|
Below-Ground Flash Points*
|
---|
|
Zoning Districts
|
Less than 70
|
70-200
|
Less than 70
|
70-200
|
---|
|
C-2, I
|
5,000
|
20,000
|
10,000
|
40,000
|
|
NOTES:
*Flash Point in degrees of Fahrenheit.
|
|
Zoning Districts
|
Gases (SCF)* Above-Ground
|
Below-Ground
|
---|
|
C-2, I
|
150,000
|
300,000
|
|
NOTES:
*SCF = Standard cubic feet at 60° F. and
29.92 inches Hg.
|
Ambient air quality standards have been established
by the Commonwealth of Pennsylvania and are enforced by the Regional
Air Pollution Control Board. In order to minimize overlapping regulations,
the Township adopts these standards as its own. However, to govern
situations of a localized nature, the following additional regulations
are provided.
A. Odor. Odor threshold is defined as the lowest concentration
of odorous matter that produces an olfactory response in normal human
beings. Odor thresholds shall be measured in accordance with ASTM
d 1931-57 "Standard Method for Measurement of Odor in Atmosphere (Dilution
Method)" or its equivalent.
(1) Residential, commercial, special districts. Odorous
material released from any operation or activity shall not exceed
the odor threshold concentration beyond the lot line, measured either
at ground level or habitable elevation.
(2) Industrial districts. Odorous materials released from
any operation or activity shall not exceed the odor threshold concentration
at or beyond the district boundary line, measured either at ground
level or habitable elevation.
(3) Toxic matter. Should any such odorous material contain
toxic material, such airborne toxic matter shall not exceed 1/30 of
the odor threshold at the appropriate points of measurement.
B. Smoke. For the purpose of grading the density or equivalent
capacity of smoke, the Ringelmann Chart published by the U.S. Bureau
of Mines shall be used.
(1) Residential, commercial, special districts. The emission
of smoke darker than Ringelmann No. 1 from any chimney stack, vent,
opening or combustion process is prohibited.
(2) Industrial districts. The emission of smoke darker
than Ringelmann No. 1 from any chimney stack, vent, opening or combustion
process is prohibited; however, smoke of a shade not to exceed Ringelmann
No. 3 is permitted for up to three minutes total in any one eight-hour
period.