No grading, removal of vegetation, construction or other disturbance
shall be permitted on soils that are classified as slide-prone or
unstable in the Soil Survey of Butler County or on any other areas
of a proposed development site that exhibit signs of instability,
except in accordance with the provisions of this section.
A. Disturbance of landslide-prone areas of construction thereon shall
be severely limited.
B. Disturbance of unstable areas may be permitted, where alternative
site designs have been exhausted, and where the developer demonstrates
to the satisfaction of the Borough Engineer through a geotechnical
report that the proposed disturbance will not cause sliding or movement
or any unsafe condition either on the development site or on any property
adjacent to it.
C. Evidence of the safety of any proposed disturbance shall require
site investigation and certification in writing by a registered soils
engineer, engineering geologist or professional engineer with experience
in soils engineering that the proposed activity will not create or
exacerbate unsafe conditions.