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Key Design and Plan Review Considerations (view source)
Revision as of 16:15, 22 June 2022
, 1 year agono edit summary
Consideration should be given to specifying a phased approach to planting in construction contracts, in which planting occurs in two stages (e.g., fall and the following spring; spring and the following fall) to help ensure the full palette of plants specified in the plan are available. Thereby, any failed plantings from the first stage of planting are sure to be replaced in the second. If many or all plantings of a certain species do not survive the first phase, they can be substituted with another more tolerant or suitable species in the second (A list of suitable shrubs, trees, graminoids, etc. can be found on our [[Plant lists]] page).
Consideration should be given to specifying a phased approach to planting in construction contracts, in which planting occurs in two stages (e.g., fall and the following spring; spring and the following fall) to help ensure the full palette of plants specified in the plan are available. Thereby, any failed plantings from the first stage of planting are sure to be replaced in the second. If many or all plantings of a certain species do not survive the first phase, they can be substituted with another more tolerant or suitable species in the second (A list of suitable shrubs, trees, graminoids, etc. can be found on our [[Plant lists]] page).
==Inclusion of Sediment Removal Plans==
As mentioned previously, it is recommended that, where possible, [[pretreatment]] devices be included in BMP designs that help retain coarse sediment and debris in an easily accessible location before it enters the BMP itself. However even with pretreatment devices in place, fine sediment will inevitably reach the BMP and accumulate over time. LID BMP designs need to consider how sediment can be removed from associated manhole sumps, pretreatment devices, inlets and pipes, and include adequate features and routes for access by necessary equipment.
{|class="wikitable" style="width: 1275px;"
|+'''Sediment Removal Equipment per BMP Type'''
|-
!<br>'''LID BMP Type'''
!<br>'''Equipment Required for Sediment Removal'''
|-
|'''[[Permeable pavement|Permeable Pavers]]'''
|For permeable pavements, regenerative air sweeper (for routine maintenance) or vacuum sweeper (for rehabilitation) equipment (e.g., street cleaner trucks or more compact units) will be needed, so designs should allow access to the majority of the surface by necessary equipment (e.g., minimize obstructions and sharp corners);
|-
|'''[[Inlets]], [[Vegetated filter strips|Grass filter strips]], [[gravel diaphragms]], [[Check dams]], and [[Forebays]]'''
|Use of a vacuum sweeper truck with hose attachment, soil blower truck (operated in reverse), sidewalk vacuum or hand tools (e.g., rakes and shovels) are options for each of these [[Pretreatment|pretreatment devices]] and flow controlling/detention devices.
|-
|'''Vegetated BMPs'''
|For removing sediment from the filter beds of vegetated BMPs, use of a vacuum truck with hose attachment, soil blower truck (operated in reverse) or hand tools are options that can minimize the need to remove established [[vegetation]], while use of a small excavator or backhoe can also be effective, but will require vegetation removal and transplanting (where feasible) or replacement after the work is completed.
|-
|'''Underground BMPs'''
|For underground BMPs (e.g., [[Infiltration chambers|underground infiltration systems]], [[soil cells]]) and associated [[pretreatment]] devices (e.g., manhole sumps, [[Oil and grit separators|hydrodynamic/oil and grit separators]], isolator rows, [[forebays]]), and in-line filters, hydro-vac trucks will likely be needed.
|-
|}