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Inspection and Maintenance: Enhanced Swales (view source)
Revision as of 17:55, 4 July 2022
, 2 years agono edit summary
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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==
[[File:Protecting swale during construction.PNG|thumb|400px|The diagram above depicts the use of an enhanced swale as a temporary detention basin during construction. This practice is avoided at all costs as it can lead to subgrade clogging and compaction, but in the case where LIDs must be used for construction stormwater detention due to site constraints, protection measures can be applied to prevent accumulated sediment from migrating into the subgrade when an LID is first being developed. This method would have to be outlined on the inspection sheet specifically to ensure construction inspection tasks include addressing its condition through all three sequences (Source: TRCA, 2019)<ref>]]
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 or that adequate ESCs or flow diversion devices are in place and confirm that construction materials meet design specifications
# At completion of excavation and grading, prior to installation of pipes/sewers and backfilling to ensure depths, slopes and elevations are acceptable
# At completion of installation of pipes/sewers, prior to backfilling to ensure slopes and elevations are acceptable
# After final grading, prior to planting 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 [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. You can also download and print the table [https://wikidev.sustainabletechnologies.ca/images/7/7f/Construction_Inspection.pdf '''here''']<br>
{| class="wikitable" style="width: 1000px;"
|+'''Bioretention/Swales: 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
|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="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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|rowspan="4"|'''BMP Installation''' – after installation of pipes/sewers, prior to backfilling
|Structural components (e.g., foundation, walls) installed according to plans, if applicable
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|Impermeable liner installed correctly, if applicable
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|Installations of sub-drain pipes (e.g., locations, elevations, slopes), standpipes/monitoring wells are acceptable
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|Sub-drain trench dams installed correctly (location, elevation)
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|rowspan="4"|'''Landscaping''' – after final grading, prior to planting
|Filter bed depth and surface elevations at inlets are acceptable
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|Maximum surface ponding depth is acceptable
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|Filter bed is free of ruts, local depressions and not overly compacted
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|Planting material meets approved planting plan specifications (plant types and quantities)
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|colspan="3" style="text-align: center;" |'''<u><span title=>Note:''' for Observation Column: S = Satisfactory; U = Unsatisfactory; NA = Not Applicable*</span></u>
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