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Line 35: |rowspan="6"|'''Natural heritage system and tree protection areas remain fenced off'''Construction materials have been confirmed to meet design specifications *Regrade damaged portion by raking and replant or restore [[mulch]]/[[stone]] cover. Animal burrows, sink holes and compacted areas should be tilled to 20 cm depth prior to re-grading. If problems persist, consider adding flow spreading device to prevent [[erosion]] or barriers to discourage foot or vehicular traffic.Vegetation is not thriving and filter media is low in organic matter (<3%) or extractable phosphorus (<10 mg/kg)*Remove stone, mulch and plant cover and uppermost 5 cm of filter media, spread 5 cm of yard waste compost, incorporate into filter media to 20 cm depth by tilling. Replace stone, mulch and plants (re-use/transplant where possible).Sub-drain perforated pipe is obstructed by sediment or roots.*Schedule hydro-vac truck or drain-snaking service to clear the obstruction.
Inspection and Maintenance: Bioretention & Bioswales (view source)
Revision as of 16:11, 8 April 2022
, 2 years ago→Construction Inspection Tasks
# After every large storm event (e.g., 15 mm rainfall depth or greater) to ensure [https://sustainabletechnologies.ca/app/uploads/2020/01/ESC-Guide-for-Urban-Construction_FINAL.pdf Erosion Sediment Controls (ESCs)] and pretreatment or flow diversion devices are functioning and adequately maintained. View the table below, which describes critical points during the construction sequence when inspections should be performed prior to proceeding further.
# After every large storm event (e.g., 15 mm rainfall depth or greater) to ensure [https://sustainabletechnologies.ca/app/uploads/2020/01/ESC-Guide-for-Urban-Construction_FINAL.pdf Erosion Sediment Controls (ESCs)] and pretreatment or flow diversion devices are functioning and adequately maintained. View the table below, which describes critical points during the construction sequence when inspections should be performed prior to proceeding further.
{|class="wikitable"
{| class="wikitable" style="width: 1000px;"
|+'''Bioretention/Swales: Construction Inspections'''
|+'''Bioretention/Swales: Construction Inspections'''
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|-
!'''Observations*'''
!'''Observations*'''
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|'''Site Preparation''' - after site clearing and grading, prior to BMP excavation and grading
|rowspan="6"|'''Site Preparation''' - after site clearing and grading, prior to BMP excavation and grading
|Natural heritage system and tree protection areas remain fenced off
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ESCs protecting BMP layout area are installed properly
|ESCs protecting BMP layout area are installed properly
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CDA is stabilized or runoff is diverted around BMP layout area
|CDA is stabilized or runoff is diverted around BMP layout area
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|-
BMP layout area has been cleared and is staked/delineated
|BMP layout area has been cleared and is staked/delineated
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Benchmark elevation(s) are established nearby
|Benchmark elevation(s) are established nearby
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|Construction materials have been confirmed to meet design specifications
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|rowspan="4"|'''BMP Excavation and Grading''' - prior to installation of pipes/sewers and backfilling
|Excavation location, footprint, depth and slopes are acceptable
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|Excavated soil is stockpiled outside the CDA
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|Embankments/berms (elevations, slopes, compaction) are acceptable
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|Excavation bottom and sides roughened to reduce smearing and compaction
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|'''BMP Installation''' – after installation of pipes/sewers, prior to backfilling
|Excavation location, footprint, depth and slopes are acceptable
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|-
|Excavated soil is stockpiled outside the CDA
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|
|-
|-
|'''BMP Excavation and Grading''' - prior to installation of pipes/sewers and backfilling
|Embankments/berms (elevations, slopes, compaction) are acceptable
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|'''[[Vegetation]]'''
|Excavation bottom and sides roughened to reduce smearing and compaction
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|'''Landscaping''' – after final grading, prior to planting
|Excavation location, footprint, depth and slopes are acceptable
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|'''[[Underdrain|Sub-drain]]'''
|Excavated soil is stockpiled outside the CDA
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|Embankments/berms (elevations, slopes, compaction) are acceptable
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|-
|Excavation bottom and sides roughened to reduce smearing and compaction
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|}
|}