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Inspection and Maintenance: Underground Infiltration Systems (view source)
Revision as of 15:59, 25 July 2022
, 1 year agono edit summary
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[[File:Infiltration before cleanout infiltr.PNG|thumb|400px|An inlet to an infiltration trench during the fall in need of maintenance (TRCA, 2018).<ref name="example1" />]]
[[File:Plan & profile view Infilt underground.PNG|thumb|400px|General plan and profile (cross-section) views showcasing key components and sections of a typical [[infiltration trench]].]]
{{textbox|Key components of Underground Infiltration Systems to pay close attention to are the:
{{textbox|Key components of Underground Infiltration Systems to pay close attention to are the:
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|colspan="7" style="text-align: center;" |'''<u><span title=>Note:''' (x) denotes indicators to be used for Performance Verification inspections only (i.e., not for Maintenance Verification inspections) </span></u>
|colspan="7" style="text-align: center;" |'''<u><span title=>Note:''' (x) denotes indicators to be used for Performance Verification inspections only (i.e., not for Maintenance Verification inspections) </span></u>
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==Construction Inspection Tasks==
Construction inspections take place during several points in the construction sequence, specific to the type of LID BMP, but at a minimum should be done '''weekly''' and include the following:
# During site preparation, prior to BMP excavation and grading to ensure the CDA is stabilized and/or flow diversion devices are in place and confirm that construction materials meet design specifications
# At completion of excavation and grading, prior to backfilling and installation of pipes to ensure depths, slopes and elevations are acceptable
# At completion of installation of geotextile/pipes, prior to completion of backfilling to ensure slopes and elevations are acceptable
# After final grading, prior to surface course installation to ensure depths, slopes and elevations are acceptable
# Prior to hand-off points in the construction sequence when the contractor responsible for the work changes (i.e., hand-offs between the storm sewer servicing, paving, building and landscaping contractors)
# After every large storm event (e.g., 15 mm rainfall depth or greater) to ensure 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. You can also download and print the table [https://wikidev.sustainabletechnologies.ca/images/9/9f/LID-IM-Guide-7.4-Permeable-Pavements.pdf '''here''']<br>
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[[File:MaintenancePICP.png|thumb|400px|A Vacuum Truck used for [[permeable pavement]] maintenance, which sucks up excess sediment and fines trapped between the pores of block pavers. Conducting this maintenance regularly helps maintain the practice's optimal infiltration rate during large rain events. (Source: STEP).]]
{| class="wikitable" style="width: 800px;"
|+'''Underground Infiltration Systems: Construction Inspections'''
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!<br>'''Construction Sequence Step & Timing'''
!<br>'''Inspection Item'''<br>
!<br>'''<u><span title="Note for Observation Column: S = Satisfactory; U= Unsatisfactory; NA = Not Applicable ">Observations*</u>'''<br>
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|rowspan="6"|'''Site Preparation''' - after site clearing and grading, prior to BMP excavation 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
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|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
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|Benchmark elevation(s) are established nearby
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|Construction materials have been confirmed to meet design specifications
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|rowspan="5"|'''BMP Excavation and Grading''' - prior to backfilling and installation of geotextile/pipes
|Excavated soil is stockpiled outside the CDA
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|Excavation location, footprint, depth and slope are acceptable
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|Compaction of subsoil where load-bearing portions of the system will be installed is acceptable
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|Excavation bottom and sides roughened to reduce smearing and compaction
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|rowspan="4"|'''BMP Installation''' – after installation of geotextile/ pipes/structures, prior to completion of backfilling
|Installation of structural components (e.g., control manhole, maintenance hatches) is acceptable
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|Sub-drain trench dams installed correctly (location, elevation)
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|Installations of sub-drain pipes (e.g., locations, elevations, slopes) & maintenance access hatches are acceptable
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