The applicant shall assure that all other applicable
environmental permits have been or will be acquired for the land development
activity prior to approval of the final stormwater design plan.
The following principles shall apply to all
land development activities within the Town of Cazenovia and to the
preparation of the submissions required under this chapter:
A. The selection of stormwater management, erosion, and
sediment control measures shall be based on an assessment of the probable
frequency of climatic and other events likely to contribute to erosion,
and on an evaluation of the risks, costs, and benefits involved.
B. Properties adjacent to the site of a land disturbance
shall be protected from sediment deposition. This may be accomplished
by preserving a well-vegetated buffer strip around the lower perimeter
of a land disturbance, by installing perimeter controls such as sediment
barriers, filters, dikes, or sediment basins, or by a combination
of such measures. Vegetated buffer strips may be used alone only where
runoff in sheet flow is expected. Buffer strips should be at least
20 feet in width. If, at any time, it is found that a vegetated buffer
strip alone is ineffective in preventing sediment movement onto adjacent
property, additional perimeter controls must be provided.
C. Development shall reflect the topography and soils
of the site so as to create the least potential for erosion. Areas
of steep slopes where high cuts and fills may be required shall be
avoided wherever possible, and natural contours shall be followed
as closely as possible.
D. Natural vegetation shall be retained and protected
wherever possible. A permanent vegetative cover shall be established
on denuded areas not otherwise permanently stabilized. Permanent vegetation
and related structures shall be installed as soon as practical, or
within the time limit specified in the permit. Permanent vegetation
shall not be considered established until a groundcover is achieved
which, in the opinion of the Stormwater Management Officer, or designated
agent, is mature enough to control soil erosion satisfactorily and
to survive severe weather conditions.
E. Permanent or temporary soil stabilization must be
applied to denuded areas within 15 days after final grade is reached
on any portion of the site. Soil stabilization must also be applied
within 15 days to denuded areas which may not be at final grade but
will remain dormant or undisturbed for more than 60 days. Soil stabilization
refers to measures which protect soil from the erosive forces of raindrop
impact and flowing water. Applicable practices include vegetative
establishment, mulching, and the early application of gravel base
on areas to be paved.
F. Sediment basins, debris basins, silt traps, sediment
barriers, filters, or other measures intended to trap sediment on-site
shall be installed and maintained to remove sediment from runoff waters
before any upslope land disturbance takes place.
G. All on-site stormwater conveyance channels and detention
systems shall be designed and constructed to withstand the expected
critical velocity of flow from a ten-year frequency storm without
erosion. Stabilization adequate to prevent erosion must also be provided
at the outlets of all pipes and paved channels.
H. All existing stormwater inlets shall be protected
so that sediment-laden water will not enter the stormwater collection
system without first being filtered or otherwise treated to remove
sediment.
I. Construction vehicles should be kept out of watercourses
to the greatest extent possible. Where in-channel work is necessary,
precautions must be taken to stabilize the work area during construction
to minimize erosion. This may include blocking of the flow and transporting
water around the work area. The channel (including the bed and banks)
must be restabilized immediately after in-channel work is completed.
Where a live or wet watercourse must be crossed by construction vehicles
regularly during construction, a temporary stream crossing must be
provided.
J. Wherever construction vehicle access routes intersect
paved public roads, provisions must be made to minimize the transport
of sediment by runoff or vehicle tracking onto the paved surface.
Where sediment is transported onto public road surfaces, the roads
shall be cleaned thoroughly at the end of each day. Sediment shall
be removed from roads by shoveling or sweeping and transported to
a sediment control area. Street washing shall be allowed only after
sediment is removed in this manner.
K. All temporary erosion and sediment control measures
shall be disposed of within 30 days after final site stabilization
is achieved or after the temporary measures are no longer needed,
unless authorized by the Stormwater Management Officer. Trapped sediment
and other disturbed soil areas resulting from the disposition of temporary
measures shall be permanently stabilized to prevent further erosion
and sedimentation.
L. All temporary and permanent erosion and sediment control
practices must be maintained and repaired as needed to assure continued
performance of their intended function.
M. All land development activities exceeding one acre
in developed area, or stream crossings, may also be regulated by NYSDEC
permits. Contact NYSDEC to confirm applicability of NYSDEC permits.