Group
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Practice
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Description
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Preservation of Natural Resources
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Preservation of undisturbed areas
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Delineate and place into permanent conservation easement undisturbed
forests, native vegetated areas, riparian corridors, wetlands and
natural terrain.
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Preservation of buffers
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Define, delineate and place in permanent conservation easement
naturally vegetated buffers along perennial streams, rivers, shorelines
and wetlands.
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Reduction of clearing and grading
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Limit clearing and grading to the minimum amount needed for
roads, driveways, foundations, utilities and stormwater management
facilities.
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Locating development in less sensitive areas
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Avoid sensitive resource areas such as floodplains, steep slopes,
erodible soils, wetlands, mature forests and critical habitats by
locating development to fit the terrain in areas that will create
the least impact.
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Open space design
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Use clustering, conservation design or open space design to
reduce impervious cover, preserve more open space and protect water
resources.
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Restore the original properties and porosity of the soil by
deep till and amendment with compost to reduce the generation of runoff
and enhance the runoff reduction performance of practices such as
downspout disconnections, grass channels, filter strips and tree clusters.
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Reduction of Impervious Cover
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Roadway reduction
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Minimize roadway widths and lengths to reduce site impervious
area.
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Sidewalk reduction
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Minimize sidewalk lengths and widths to reduce site impervious
area.
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Driveway reduction
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Minimize driveway lengths and widths to reduce site impervious
area.
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Cul-de-sac reduction
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Minimize the number of culs-de-sac and incorporate landscaped
areas to reduce their impervious cover.
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Building footprint reduction
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Reduce the impervious footprint of residences and commercial
buildings by using alternate or taller buildings while maintaining
the same floor-to-area ratio.
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Parking reduction
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Reduce imperviousness on parking lots by eliminating unneeded
spaces, providing compact car spaces and efficient parking lanes,
minimizing stall dimensions, using porous pavement surfaces in overflow
parking areas, and using multistoried parking decks where appropriate
and allowed.
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Group
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Practice
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Description
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Runoff Reduction Techniques
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Conservation of natural areas
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Retain the pre-development hydrologic and water quality characteristics
of undisturbed natural areas and stream and wetland buffers by restoring
and/or permanently conserving these areas on a site.
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Sheetflow to riparian buffers or filter strips
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Undisturbed natural areas such as forested conservation areas
and stream buffers or vegetated filter strips and riparian buffers
can be used to treat and control stormwater runoff from some areas
of a development project.
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Vegetated open swale
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The natural drainage paths, or properly designed vegetated channels,
can be used instead of constructing underground storm sewers or concrete
open channels to increase time of concentration, reduce the peak discharge
and provide infiltration.
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Tree planting/tree box
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Plant or conserve trees to reduce stormwater runoff, increase
nutrient uptake and provide bank stabilization. Trees can be used
for applications such as landscaping, stormwater management practice
areas, conservation areas and erosion and sediment control.
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Disconnection of rooftop runoff
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Direct runoff from residential rooftop areas and upland overland
runoff flow to designated pervious areas to reduce runoff volumes
and rates.
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Stream daylighting for redevelopment projects
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Stream daylight previously culverted/piped streams to restore
natural habitats, better attenuate runoff by increasing the storage
size and promoting infiltration, and help reduce pollutant loads.
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Rain garden
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Manage and treat small volumes of stormwater runoff using a
conditioned planting soil bed and planting materials to filter runoff
stored within a shallow depression.
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Green roof
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Capture runoff by a layer of vegetation and soil installed on
top of a conventional flat or sloped roof. The rooftop vegetation
allows evaporation and evapotranspiration processes to reduce volume
and discharge rate of runoff entering conveyance system.
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Stormwater planter
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Small landscaped stormwater treatment devices that can be designed
as infiltration or filtering practices. Stormwater planters use soil
infiltration and biogeochemical processes to decrease stormwater quantity
and improve water quality.
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Rain tank/cistern
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Capture and store stormwater runoff to be used for irrigation
systems or filtered and reused for noncontact activities.
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Porous pavement
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Pervious types of pavements that provide an alternative to conventional
paved surfaces, designed to infiltrate rainfall through the surface,
thereby reducing stormwater runoff from a site and providing some
pollutant uptake in the underlying soils.
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Group
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Practice
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Description
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Pond
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Micropool extended detention pond (P-1)
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Pond that treats the majority of the water quality
volume through extended detention, and incorporates a micropool at
the outlet of the pond to prevent sediment resuspension
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Wet Pond (P-2)
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Pond that provides storage for the entire water
quality volume in the permanent pool
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Wet extended detention pond (P-3)
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Pond that treats a portion of the water quality
volume by detaining storm flows above a permanent pool for a specified
minimum detention time
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Multiple pond system (P-4)
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A group of ponds that collectively treats the
water quality volume
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Pocket pond (P-5)
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A stormwater wetland design adapted for the
treatment of runoff from small drainage areas that has little or no
baseflow available to maintain water elevations and relies on groundwater
to maintain a permanent pool
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Wetland
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Shallow wetland (W-1)
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A wetland that provides water quality treatment
entirely in a shallow marsh
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Extended detention wetland (W-2)
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A wetland system that provides some fraction
of the water quality volume by detaining storm flows above the marsh
surface
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Pond/wetland system (W-3)
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A wetland system that provides a portion of
the water quality volume in the permanent pool of a wet pond that
precedes the marsh for a specified minimum detention time
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Pocket wetland (W-4)
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A shallow wetland design adapted for the treatment
of runoff from small drainage areas that has variable water levels
and relies on groundwater for its permanent pool
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Infiltration
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Infiltration trench (I-1)
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An infiltration practice that stores the water
quality volume in the void spaces of a gravel trench before it is
infiltrated into the ground
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Infiltration basin (I-2)
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An infiltration practice that stores the water
quality volume in a shallow depression before it is infiltrated into
the ground
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Dry well (I-3)
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An infiltration practice similar in design to
the infiltration trench, and best suited for treatment of rooftop
runoff
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Filtering practices
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Surface sand filter (F-1)
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A filtering practice that treats stormwater
by settling out larger particles in a sediment chamber, and then filtering
stormwater through a sand matrix
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Underground sand filter (F-2)
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A filtering practice that treats stormwater
as it flows through underground settling and filtering chambers
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Perimeter sand filter (F-3)
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A filter that incorporates a sediment chamber
and filter bed as parallel vaults adjacent to a parking lot
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Organic filter (F-4)
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A filtering practice that uses an organic medium
such as compost in the filter in place of sand
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Bioretention (F-5)
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A shallow depression that treats stormwater
as it flows through a soil matrix, and is returned to the storm drain
system
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Open channels
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Dry swale (O-1)
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An open drainage channel or depression explicitly
designed to detain and promote the filtration of stormwater runoff
into the soil media
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Wet swale (O-2)
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An open drainage channel or depression designed
to retain water or intercept groundwater for water quality treatment
|
Whereas, the Village of Irvington ("Municipality")
and the __________ ("facility owner") want to enter into an agreement
to provide for the long term maintenance and continuation of stormwater
control measures approved by the Municipality for the below named
project, and
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Whereas, the Municipality and the facility owner
desire that the stormwater control measures be built in accordance
with the approved project plans and thereafter be maintained, cleaned,
repaired, replaced and continued in perpetuity in order to ensure
optimum performance of the components. Therefore, the Municipality
and the facility owner agree as follows:
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1.
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This agreement binds the Municipality and the
facility owner, its successors and assigns, to the maintenance provisions
depicted in the approved project plans which are attached as Schedule
A of this agreement.
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2.
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The facility owner shall maintain, clean, repair,
replace and continue the stormwater control measures depicted in Schedule
A as necessary to ensure optimum performance of the measures to design
specifications. The stormwater control measures shall include, but
shall not be limited to, the following: drainage ditches, swales,
dry wells, infiltrators, drop inlets, pipes, culverts, soil absorption
devices, stormwater ponds and wetlands, bioretention and rain gardens,
tree boxes, green roofs, stormwater planters, rain tanks and cisterns,
and porous pavement.
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3.
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The facility owner shall be responsible for
all expenses related to the maintenance of the stormwater control
measures and shall establish a means for the collection and distribution
of expenses among parties for any commonly owned facilities.
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4.
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The facility owner shall provide for the periodic
inspection of the stormwater control measures, at the frequency recommended
in the Design Manual, to determine the condition and integrity of
the measures. Such inspection shall be performed by a professional
engineer licensed by the State of New York. The inspecting engineer
shall prepare and submit to the municipality, within 30 days of the
inspection, a written report of the findings, including recommendations
for those actions necessary for the continuation of the stormwater
control measures.
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5.
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The facility owner shall not authorize, undertake
or permit alteration, abandonment, modification or discontinuation
of the stormwater control measures except in accordance with written
approval of the Municipality.
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6.
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The facility owner shall undertake necessary
repairs and replacement of the stormwater control measures at the
direction of the Municipality or in accordance with the recommendations
of the inspecting engineer.
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7.
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The facility owner shall provide to the Municipality
within 30 days of the date of this agreement, a security for the maintenance
and continuation of the stormwater control measures in the form of
(a Bond, letter of credit or escrow account).
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8.
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This agreement shall be recorded in the Office
of the County Clerk, County of __________ together with the deed for
the common property and shall be included in the offering plan and/or
prospectus approved pursuant to __________
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9.
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If ever the Municipality determines that the
facility owner has failed to construct or maintain the stormwater
control measures in accordance with the project plan or has failed
to undertake corrective action specified by the Municipality or by
the inspecting engineer, the Municipality is authorized to undertake
such steps as reasonably necessary for the preservation, continuation
or maintenance of the stormwater control measures and to affix the
expenses thereof as a lien against the property.
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10.
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This agreement is effective __________.
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